PAKET UMROH BULAN FEBRUARI MARET APRIL MEI 2018




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LONDON, Saco-Indonesia.com - Inilah yang terjadi ketika anda terkena turbulensi ekstrem sesaat setelah sarapan disajikan. Para penumpang sebuah penerbangan Singapure Airlines baru-baru ini mengalami kekacauan di kabin setelah penerbangan mereka mengalami guncangan keras dan mendadak terhempas (kehilangan ketinggian).

Sebanyak 11 penumpang dan seorang awak terluka dalam insiden yang dialami penumpang bernomor penerbangan SQ308 dari Singapura menuju London itu.

Seorang penumpang pada penerbangan itu, yang melihat kopinya berakhir di langit-langit kabin, berhasil mengambil sejumlah gambar yang ia posting ke Instagram. Penumpang bernama Alan Cross itu mengatakan kepada ABC News bahwa para penumpang dalam penerbangan itu telah diperingatkan akan mengalami turbulensi dan bahwa layanan sarapan akan dihentikan sementara.

Beberapa saat kemudian tanda sabuk dikenakan muncul. Kapten pun mengeluarkan perintah agar semua awak kabin segera kembali ke tempat duduk. Cross mengatakan, turbulensi yang kemudian terjadi terasa 'seperti berada dalam lift yang kabelnya terpotong atau seperti terjun bebas dari komedi putar."

Ia mengatakan, segala sesuatu yang tidak terikat, termasuk orang-orang, menghantam langit-langit.

Maskapai itiu mengatakan kepada Australia News seperti dikutip Mail Online, Senin, "Sebelas penumpang dan seorang awak menderita luka ringan saat pesawat itu tiba-tiba mengalami kehilangan ketinggian dan (mereka) menjalani perawatan medis saat tiba di Bandara Heathrow (London). Tanda-tanda kenakan sabuk pengaman telah muncul dan layanan makan sudah ditangguhkan."

Cross berkata, para awak kabin sangat mengagumkan setelah guncangan itu terjadi, mereka dengan tenang dan efisien melakukan bersih-bersih. Dia mengatakan para awak memeriksa yang cedera sebelum membersihkan kekacauan dan memberikan penumpang sejumlah kotak cokelat saat mereka di Heathrow, di mana mereka ditemui paramedis.

Menurut Mail Online, awal tahun ini, para ilmuwan sudah menyatakan bahwa perubahan iklim dapat mengakibatkan penerbangan dari London ke New York akan semakin menggucang di masa depan. Para peneliti dari universitas East Anglia dan Reading menganalisa simulasi superkomputer prihal kondisi atmosfer di atas Atlantik Utara dan mengklaim perubahan iklim akan meningkatkan turbulensi udara.

Editor :Liwon Maulana
Kekacauan di Area Penerbangan Setelah Kena Turbulensi

saco-indonesia.com, Presiden Internazionale Erick Thohir paham bahwa Derby della Madonnina akan melawan AC Milan adalah salah satu laga yang terpenting musim ini. Dia pun juga mengatakan bahwa Nerazzurri juga tak bisa menganggap remeh sang rival sekota meski mereka telah terpisah jarak cukup lebar di klasemen sementara.

Inter saat ini telah menempati posisi lima Serie A 2013/14 dengan 28 poin, sedangkan Milan tercecer di tangga ke-10 dengan 19 angka. Dalam sebuah derby, hal semacam itu juga tak bisa dijadikan sebagai acuan. Bentrokan giornata 17, Senin (23/12), juga takkan jauh beda.

"Derby adalah salah satu laga yang terpenting musim ini. Saya juga tak sabar untuk dapat menyaksikannya dan pasti hebat kalau kami bisa menang," papar Thohir kepada Sky Sport Italia.

"Namun, kami juga tak bisa meremehkan AC Milan karena mereka juga telah memiliki tim yang sangat kuat. Saya tahu laga ini takkan mudah, tapi kami juga harus memberikan yang terbaik," imbuhnya.

Inter juga butuh kemenangan untuk dapat mengejar 35 poin Napoli di batas zona Liga Champions, sedangkan Milan bertekad kembali ke papan atas. Selain tiga angka, gengsi juga menjadi salah satu pertimbangan.

Laga ini bakal ketat.


Editor : Dian Sukmawati

MILAN TAK BISA DIREMEHKAN

Tips Memilih Lampu

Tipe lampu rumah Saat ini, hampir di setiap rumah pasti telah memiliki lampu. Lampu listrik yang umum digunakan sebagai penerang untuk rumah tinggal, dapat dibedakan menjadi 3 golongan besar, yaitu lampu pijar, lampu halogen dan lampu berpendar (fluorescent). Saat ini juga telah hadir lampu LED yang lebih hemat dan efisien.

Banyaknya jenis lampu yang beredar saat ini telah membuat Anda harus perlu memperhatikan faktor apa saja yang perlu Anda pertimbangkan saat memilih lampu. Berikut ini ada beberapa faktor yang dapat Anda pertimbangkan saat memilih lampu untuk rumah anda:

Kondisi Lingkungan

Penempatan lampu juga perlu disesuaikan dengan kondisi lingkungan. Misalnya, untuk lampu yang diletakkan di luar sebaiknya dengan menggunakan bahan stainless steel, alumunium atau besi yang sudah dicat antikarat karena mungkin kelembaban di luar ruangan lebih tinggi.

Penempatan Lampu

Menentukan titik-titik penempatan lampu biasanya adalah hal utama yang biasanya telah dilakukan. Anda mungkin akan mempertimbangkan juga lampu mana yang akan ditanam di dinding atau plafon. Hal ini telah dilakukan sebelum Anda membangun atau merenovasi rumah.

Model Lampu

Sesuaikan model lampu dengan karakter rumah. Lampu dengan desain tradisional klasik tentu akan terlihat aneh bila ditempatkan pada rumah yang telah memiliki konsep modern minimalis atau sebaliknya.

Warna Cahaya Lampu

Menentukan warna cahaya lampu yang ingin digunakan. Lampu dengan karakter cahaya kuning disinyalir mampu untuk membangkitkan suasana yang hangat dan romantis, sehingga sangat cocok ditempatkan di ruang tidur atau ruang lain yang digunakan untuk bersantai. Sementara cahaya putih lebih cocok digunakan di tempat kerja. Penentuan warna cahaya ini dengan sendirinya akan dapat membimbing Anda menentukan pilihan antara lampu neon dan lampu pijar.

Karakteristik Lampu

Sifat lampu yang memancarkan panas juga dapat dijadikan faktor penimbang saat Anda memilih rumah lampu (fitting). Sebagai satu kesatuan, rumah lampu yang Anda pilih sebaiknya tahan terhadap panas, tidak mudah leleh dan tidak mudah terbakar. Selain itu, anda juga dapat menggunakan sifat panas yang dipancarkan lampu di ruangan yang terkesan lembab untuk dapat mengeringkan dan mengurangi kelembaban ruangan.

Efisiensi

Jika anda menginginkan tagihan listrik bulanan yang lebih murah, anda pastinya perlu memilih lampu LED sebagai sarana penerangan utama anda. Dengan lampu LED, anda akan mendapatkan cahaya yang terang dengan daya listrik yang relatif kecil. Selain itu juga, cahaya yang dihasilkan oleh lampu LED tidak panas.


Editor : Dian Sukmawati

TIPS MEMILIH LAMPU

Untuk mengontrol suatu proses, dibutuhkan informasi mengenai kuantitas dan kualitas ciri-ciri fisik proses itu. Instrumen-instrumen ukur dipakai untuk mendapatkan informasi ini. Kontrol yang lebih ketat membutuhkan pengukuran yang lebih akurat. Beberapa istilah yang lazim dipakai dalam system pengukuran adalah proves variable, range, zero, span, error, linearitas, akurasi. Sekarang akan kita bahas masing masing dari istilah diatas.

1. Proses Variabel
Proses variabel adalah besaran phisik atau besaran kimia karena berbagai pengaruh proses. Tekanan, temperature, flow dan level adalah variabel phisik; sedangkan kandungan oksigen dan nilai pH adalah variabel-variabel kimia.
2. Range
Range adalah mengambarkan batasan sinyal yang berhubungan dengan instrumen input ataupun instrumen output. Batasan sinyal terendah dari suatu sinyal input adalah kuantitas instrumen terendah yang diukur, sedang batasan maksimumnya adalah nilai tertinggi. Sebagai contoh, suatu proses mempunyai batas atau range tekanan dari 100 kPa sampai 500 kPa. Maka alat instrumenasi proses ini tidak dapat digunakan untuk mengukur nilai dibawah 100 kPa atau diatas 500 kPa.
3. Zero
Nilai terendah suatu sinyal input atau sinyal output disebut zero, meskipun nilainya tidak nol. Sebagi contoh, range input transmiter tekanan mungkin 0 – 1000 kPa sedang range outputnya 20 sampai 100 kPa. Dari sini, nilai zero sinyal output digambarkan dengan 20 kPa. Transmiter temperatur dapat mengukur temperatur anatara 50oC dan 120 oC, sedang nilai outputnya bervariasi dari 20 sampai 100 kPa. Dalam hal ini, nilai zero pada range input dan output masing-masing adalah 50 oC dan 20 kPa.
4. Span
Span input dan output dari suatu instrumen berhubungan langsung dengan range input ataupun range outputnya. Span adalah selisih aljabar antara nilai range teratas dengan nilai range terendah.
5. Error
Error adalah selisih antara nilai yang diukur dengan nilai yang sebenarnya. Sebagai contoh, jika pressure gage menunjukkan 216 kPa ketika tekananya nyatanya 220 kPa, maka errornya adalah – 4kPa.
6. Linieritas
Linieritas menggambarkan kedekatan hubungan antara input dengan output dari suatu instrument yang digambarkan seperti sebuah garis lurus ; hal tersebut adalah, sebuah gris lusrus dari 0% input dan 0% output sampai 100% input dan 100% output. Jika hubungan ini menyimpang maka timbul ketidak linieran. Ketidak linieran output biasanya dinyatakan dalam persentase skala penuh atau full scale output.
7. Akurasi
Akurasi dari sebuah instrumen dapat didefinisikan sebagai kedekatan antara pengukuran atau output yang menggambarkan nilai nyata. Akurasi biasanya dinyatakan dengan persentase span.

 

DASAR DASAR KALIBRASI INSTRUMENT

Makin banyaknya orang bertransaksi secara online saat ini mulai membuat paradigma baru dalam kehidupan masyarakat. Orang-orang akan semakin mudah berbelanja walaupun penjual dan pembeli tidak saling bertemu secara fisik, tempat merekapun sangat berjauhan. Itulah sebabnya jasa kirim barang semakin di butuhkan terutama oleh para pelaku bisnis ini.

Peluang bisnis dan prospek jasa kirim barang masih sangat bagus dan terus berkembang. Tentu saja bukan hanya orang yang berbisnis online target utama kita, masyarakat umum hingga perusahaan besar sangat membutuhkan bisnis jasa kirim barang ini. Walau begitu, diperlukan riset yang mendalam guna memulai usaha jasa kirim barang.

Ada beberapa hal yang mesti anda lakukan sebelum memulai usaha jasa kirim barang, riset ini juga akan menentukan jenis usaha jasa kirim barang dan jangkauannya.

1. Tentukan daerah operasional dan alat transportasi usaha jasa kirim barang anda.

Bila lokasi usaha anda berada di pusat bisnis kota yang ramai dengan banyak perusahaan, bank, pusat perbelanjaan dan kantor lainnya. Anda juga dapat memilih sepeda motor sebagai sarana transfortasi utama, ruang lingkup daerah operasi anda mungkin akan lebih kecil karena keterbatasan sepeda motor yang tidak dapat mengantar dengan jarak yang jauh dan paket ukuran besar. Namun sepeda motor juga dapat mempercepat pengantaran paket yang dikirim karena pusat bisnis kota adalah daerah macet, memilih sepeda motor sebagai alat transportasi adalah yang terbaik bagi usaha baru.

Bila lokasi usaha anda jauh dari pusat bisnis kota, atau bagi anda yang sudah menguasai pusat bisnis kota. Pilihan menggunakan mobil adalah keharusan, hal ini karena jarak tempuh mobil lebih luas dan paket yang di antar dapat lebih banyak dan ukuran paket yang lebih besar. Semakin luas jangkauan operasi tentu juga akan semakin banyak keuntungan yang di dapat.

2. Tentukan jenis paket layanan yang akan anda antar

Bila lokasi usaha jasa kirim barang anda berada di pusat bisnis kota, anda juga dapat menangani pengiriman surat menyurat, dokumen penting dan paket-paket kecil di dalam kawasan pusat bisnis kota saja. Transfortasi utama yang anda butuhkan adalah sepeda motor. Kuasai dahulu pasar ini sebelum anda memutuskan melebarkan wilayah operasi.

Bila lokasi usaha jasa kiriman barang anda terletak di pinggiran kota, anda juga dapat mengambil semua jenis paket anataran. Mulai dari surat menyurat, dokumen rahasia, paket kecil sampai kargo ukuran besar. Anda juga dapat beroperasi di semua wilayah, tentu dengan dukungan alat transfortasi mobil yang harus anda miliki. Hal ini juga berlaku bagi anda yang sudah menguasai pasar pusat bisnis kota dan ingin melebarkan pelayanan usaha anda.

3. Tentukan tarif layanan yang anda antar

Anda juga harus menentukan besaran tarif yang pas bagi layanan jasa kirim barang anda. Tentunya tarif untuk dapat mengantar surat dengan dokumen rahasia adalah berbeda walaupun ukuran mungkin saja sama, begitu juga paket. Anda juga harus membuat tarif berdasarkan jenis, berat, ukuran dan jarak tempuh antaran paket tersebut.

Anda juga harus menentukan jam operasional, batas kirim barang, biaya tambahan dan layanan lainnya yang ditawarkan. Anda juga harus menentukan jam berapa batas kirim barang yang langsung diantar hari ini atau termasuk antaran esok hari. Ketahui juga tarif dari kompetitor anda diwilayah usaha anda.

4. Promosikan bisnis jasa pengiriman barang anda

Promosi untuk peluang usaha jasa kirim barang adalah suatu keharusan. Buatlah kartu nama dan brosur atau leaflet usaha anda. Bagikan ke kantor kantor di pusat bisnis kota, tempat keramaian atau toko toko di pasar, mal dan disekitar tempat usaha anda. Buat papan nama didepan lokasi usaha, memasang iklan di korandan yelow page.

Anda juga dapat membuat sebuah Website perusahaan yang profesional guna untuk membantu usaha anda secara online. Pastikan website berisi konten berupa daftar tarif, wilayah operasional, waktu pengiriman dan kalau memungkinkan ada traking barang yang sedang diantar.

5. Urus izin usaha agar bisnis anda menjadi resmi

Izin usaha bagi peluang usaha jasa kirim barang merupakan sebuah keharusan juga, hal ini jugs akan dapat meningkatkan kepercayaan dan kredibilitas usaha anda dimata pelanggan. Pelanggan memerlukan kepastian bahwa barang mereka akan sampai sesuai dengan layanan. Anda dapat mengurus Surat izin gangguan, surat izin usaha perdagangan dan perizinan lain yang dibutuhkan di kantor Dinas Perindustrian dan Perdagangan di Daerah Tingkat II atau setingkat dengan Kabupaten atau Kotamadya setempat. Bagi Kabupaten atau kota yang sudah di lengkapi unit pelayanan terpadu bisa mendapatkannya di sana berikut dengan perizinan lainnya.

6. Kerjasama dengan perusahaan jasa kirim barang lain

Adakalanya barang yang hendak anda kirim ternyata telah memiliki tujuan yang jauh, diluar jangkauan dan belum terdapat kantor atau pelayanan ke daerah tersebut. Tentu anda tidak ingin begitu saja menolaknya karena ini adalah peluang bagi anda, apalagi bila itu pelanggan setia anda. Saat ini banyak yang mengajak kerjasama dibidang jasa pengantaran, anda dapat mengambil salah satunya guna melebarkan sayap. Anda juga dapat berkerjasama dengan perusahaan jasa kirim barang terkemuka seperti FedEx, Tiki atau JNE atau Pos Indonesia. Biasanya mereka akan memberikan diskon khusus bagi anda, barang yang anda kirimpun lebih terjamin.

7. Cari pelanggan tetap

Carilah pelanggan tetap, berikan tarif khusus bagi mereka. Anda juga dapat mendatangi kantor kantor atau restauran guna untuk mengurus pengiriman atau delivery barang mereka. Anda juga dapat menempatkan karyawan di tempat pelanggan tetap anda

Selain beberapa hal di atas, anda juga harus memperhatikan kesiapan usaha anda. Perhatikan kualitas pelayanan usaha, kecepatan dan ketepatan pengiriman, dan tentu saja karyawan anda. Pilih karyawan yang mempunyai keinginan untuk membantu. Dalam bidang jasa, kepuasan pelanggan adalah prioritas utama.

 

PELUANG USAHA JASA PENGIRIMAN BARANG

The 2015 Met Gala has only officially begun, but there's a clear leader in the race for best couple, no small feat at an event that threatens to sap Hollywood of every celebrity it has for the duration of an East Coast evening.

That would be Marc Jacobs and his surprise guest (who, by some miracle, remained under wraps until their red carpet debut), Cher.

“This has been a dream of mine for a very, very long time,” Mr. Jacobs said.

It is Cher's first appearance at the Met Gala since 1997, when she arrived on the arm of Donatella Versace.

– MATTHEW SCHNEIER

Cher and Marc Jacobs

ate in February, Dr. Ben Carson, the celebrated pediatric neurosurgeon turned political insurrectionist, was trying to check off another box on his presidential-campaign to-do list: hiring a press secretary. The lead prospect, a public-relations specialist named Deana Bass, had come to meet him at the dimly lit Capitol Hill office of Carson’s confidant and business manager, Armstrong Williams. Carson sat back and scrutinized her from behind a small granite table, as life-size cardboard cutouts of more conventional politicians — President Obama, with a tight smile, and Senator John McCain, glowering — loomed behind each of his shoulders. (The mock $3 bill someone had left on a table in Williams’s waiting room undercut any notion that this was a bipartisan zone; it featured Obama wearing a turban.)

Bass seemed momentarily speechless, and not just because no one had warned her that a New York Times reporter would be sitting in on her job interview. Though she knew Williams — a jack-of-all-trades entrepreneur who owns several television stations and a public-affairs business and who hosts a daily talk-radio show — through Washington’s small circle of black conservatives, the two hadn’t spoken in years until he called her two days earlier. He had been struggling to come up with the perfect national spokesperson, he told her. Then, at the gym, her name popped into his head; Williams was fairly certain she was the one. Sitting across from a likely candidate for president, Bass was adjusting to the idea that her life might be about to take a sudden chaotic turn.

“It’s like getting the most random call on a Monday that you simply do not see coming,” she said. “Oftentimes, that is how the Lord works.”

Continue reading the main story

His life in brain surgery
has prepared him for the
presidency, he maintains,
better than lives in
politics have for his rivals.

Carson concurred: “It’s always how he works in my life.” Carson is soft-spoken and often talks with his eyes half closed, frequently punctuating his sentences with a small laugh, even if the humor of his statement is not readily apparent. Bass told Carson that she had been a Republican staff member on Capitol Hill then worked for the Republican National Committee. In 2007 she started a Christian public-relations firm with her sister. She enjoyed working on the Hill, she said, but the pay wasn’t as high as the hours were long. “We figured that we worked like slaves for other people, and we wanted to work for ourselves.”

Carson stopped her. “You know you can’t mention that word, right?” Carson waited a beat, then laughed, and Williams and Bass joined in. He was getting to the point; he needed a professional who could help him check his penchant for creating uncontrolled controversy just by talking.

The Ben Carson movement began in 2013, when Carson, a neurosurgeon, whose operating-room prowess and up-from-poverty back story had made him the subject of a television movie and a regular on the inspirational-speaking circuit, was invited to address the annual National Prayer Breakfast in Washington. With Barack Obama sitting just two seats away, Carson warned that “moral decay” and “fiscal irresponsibility” could destroy America just as it did ancient Rome. He proposed a substitute for Obamacare — Health Savings Accounts, which, he said, would end any talk of “death panels” — and a flat-tax based on the concept of tithing. His address, combined with the president’s stony reaction, was a smash with Republican activists. Speaking and interview requests flooded in. Carson, then 61, announced his planned retirement a few weeks later, freeing his calendar to accept just about all of them. In the months that followed, his rhetoric became increasingly strident. The claim that drew the most attention, perhaps, was that Obamacare was “the worst thing that has happened in this nation since slavery.”

Bass’s own use of the word prompted Carson to ask her what she thought about that incident. She considered for a moment.

“If you want to reach people and have them even understand what you’re saying, there is a way to do it, without that hyperbole, that might be. . . . ” She paused. “I just think it’s important not to shut people off before they —”

Carson jumped in. “That doesn’t allow them to hear what you’re saying?”

Bass nodded.

Likening Obamacare to slavery — and slavery was incomparably worse, Carson said — had its political advantages for a candidacy like his. It was the kind of statement that stoked the angriest of the Republican voters: conservative stalwarts who can’t hear enough bad things about Obama. This, in turn, led to more talk-radio and Fox News appearances, more book sales, more donations to the super PAC started in his name, more support in the polls. (The day before the meeting, one poll of Republican voters showed Carson statistically tied for first place with Jeb Bush and Scott Walker.)

Rhetorical excess was good for business, but Carson now wants to be seen as more than a novelty candidate. He has come to learn that such extreme analogies, while true to his views, aren’t especially presidential. They alienate more moderate voters and, perhaps even more damaging, reinforce the impression that he is not “serious” — that he is another Herman Cain, the black former Godfather’s Pizza chief executive who rose to the top of the early presidential polls in 2011 but then bowed out before the Iowa caucuses, largely because of leaked allegations of sexual misconduct, which he denied but from which he never recovered. Cain lingers as a cautionary tale for the party as much as for a right-leaning candidate like Carson. The fact that Cain, with his folksy sayings (“shucky ducky”) and misnomers (“Ubeki-beki-beki-beki-stan-stan”), reached the top of the national polls — much less that he was eventually followed there by the likes of Michele Bachmann, Newt Gingrich and Rick Santorum, who all topped one or another poll in the 2012 primary season — wound up being a considerable embarrassment for the eventual nominee, Mitt Romney, and for the longtime party regulars who were trying to fast-track his way to the nomination.

Carson liked Bass and, without directly saying so, made it clear the job was hers for the taking. Carson’s campaign chairman, Terry Giles — a white lawyer whose clients have included the comedian Richard Pryor and the stepson of the model Anna Nicole Smith and who helped reconcile the business interests of the descendants of the Rev. Martin Luther King Jr. — had assembled a mostly white campaign team, including many from the 2012 Gingrich effort, and Carson wanted a person of color to speak for him. Bass said she would have to mull it over, pray about it. Carson nodded approvingly. “Pray about it,” he said. “See what you think.”

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Williams knew the party was intent on protecting the eventual 2016 nominee from the same embarrassment Romney suffered. Already, suspiciously tough articles about Carson were showing up in conservative magazines and on right-wing websites. “They’re protecting these establishment candidates,” Williams said. “This is coming from within the house. This is family.” At the very least, he wanted to make sure that Carson didn’t do their work for them. (Carson would commit another unforced error a week later, when he told CNN that homosexuality was clearly a choice, because a lot of people go in prison straight and “when they come out, they’re gay”; he later apologized.)

“We need somebody to protect him, sometimes, from himself,” he told Bass — laughing, but only half kidding.

A candidacy like Carson’s presents a new kind of problem to the establishment wing of the G.O.P., which, at least since 1980, has selected its presidential nominees with a routine efficiency that Democrats could only envy. The establishment candidate has usually been a current or former governor or senator, blandly Protestant, hailing from the moderate, big-business wing of the party (or at least friendly with it) and almost always a second-, third- or fourth-time national contender — someone who had waited “his turn.” These candidates would tack predictably to the right during the primaries to satisfy the evangelicals, deficit hawks, libertarian leaners and other inconvenient but vital constituents who made up the “base” of the party. In return, the base would, after a brief flirtation with some fantasy candidate like Steve Forbes or Pat Buchanan, “hold their noses” and deliver their votes come November. This bargain was always tenuous, of course, and when some of the furthest-right activists turned against George W. Bush, citing (among other apostasies) his expansion of Medicare’s prescription drug benefit, it began to fall apart. After Barack Obama defeated McCain in 2008, the party’s once dependable base started to reconsider the wisdom of holding their noses at all.

Photo
 
Republican candidates at a pre-straw-poll debate, held at Iowa State University in 2011. Credit Chip Somodevilla/Getty Images

This insurgent attitude was helped along by changes in the nomination rules. In 2010, the Republican National Committee, hoping to capture the excitement of the coast-to-coast Democratic primary competition between Obama and Hillary Clinton, introduced new voting rules that required many of the early voting states to award some delegates to losing candidates, based on their shares of the vote. The proportional voting rules would encourage struggling candidates to stay in the primaries even after successive losses, as Clinton did, because they might be able to pull together enough delegates to take the nomination in a convention-floor fight or at least use them to bargain for a prime speaking slot or cabinet post.

This shift in incentives did not go unnoticed by potential 2012 candidates, nor did changes in election law that allowed billionaire donors to form super PACs in support of pet candidacies. At the same time, increasingly widespread broadband Internet access allowed candidates to reach supporters directly with video and email appeals and supporters to send money with the tap of a smartphone, making it easier than ever for individual candidates to ignore the wishes of the party.

Into this newly chaotic Republican landscape strode Mitt Romney. There could be no doubt that it was his turn, and yet his journey to the nomination was interrupted by one against-the-odds challenger after another — Cain, Michele Bachmann, Newt Gingrich, Rick Santorum, Ron Paul; always Ron Paul. It was easy to dismiss the 2012 primaries as a meaningless circus, but the onslaught did much more than tarnish the overall Republican brand. It also forced Romney to spend money he could have used against Obama and defend his right flank with embarrassing pandering that shadowed him through the general election. It was while trying to block a surge from Gingrich, for instance, that Romney told a debate audience that he was for the “self-deportation” of undocumented immigrants.

At the 2012 convention in Tampa, a group of longtime party hands, including Romney’s lawyer, Ben Ginsberg, gathered to discuss how to prevent a repeat of what had become known inside and outside the party as the “clown show.” Their aim was not just to protect the party but also to protect a potential President Romney from a primary challenge in 2016. They forced through new rules that would give future presumptive nominees more control over delegates in the event of a convention fight. They did away with the mandatory proportional delegate awards that encouraged long-shot candidacies. And, in a noticeably targeted effort, they raised the threshold that candidates needed to meet to enter their names into nomination, just as Ron Paul’s supporters were working to reach it. When John A. Boehner gaveled the rules in on a voice vote — a vote that many listeners heard as a tie, if not an outright loss — the hall erupted and a line of Ron Paul supporters walked off the floor in protest, along with many Tea Party members.

At a party meeting last winter, Reince Priebus, who as party chairman is charged with maintaining the support of all his constituencies, did restore some proportional primary and caucus voting, but only in states that held voting within a shortened two-week window. And he also condensed the nominating schedule to four and a half months from six months, and, for the first time required candidates to participate in a shortened debate schedule, determined by the party, not by the whims of the networks. (The panel that recommended those changes included names closely identified with the establishment — the former Bush White House spokesman Ari Fleischer, the Mississippi committeeman Haley Barbour and, notably, Jeb Bush’s closest adviser, Sally Bradshaw.)

Grass-roots activists have complained that the condensed schedule robs nonestablishment candidates — “movement candidates” like Carson — of the extra time they need to build momentum, money and organizations. But Priebus, who says the nomination could be close to settled by April, said it helped all the party’s constituencies when the nominee was decided quickly. “We don’t need a six-month slice-and-dice festival,” Priebus said when we spoke in mid-March. “While I can’t always control everyone’s mouth, I can control how long we can kill each other.”

All the rules changes were built to sidestep the problems of 2012. But the 2016 field is shaping up to be vastly different and far larger. A new Republican hints that he or she is considering a run seemingly every week. There are moderates like Gov. John Kasich of Ohio and former Gov. George Pataki of New York; no-compromise conservatives like Senator Ted Cruz of Texas and former Senator Rick Santorum of Pennsylvania; business-wingers like the former Hewlett-Packard chief executive Carly Fiorina; one-of-a-kinds like Donald Trump — some 20 in all, a dozen or so who seem fairly serious about it. That opens the possibility of multiple candidates vying for all the major Republican constituencies, some of them possibly goaded along by super-PAC-funding billionaires, all of them trading wins and collecting delegates well into spring.

Giles says his candidate can capitalize on all that chaos. Rivals may laugh, but Giles argues that if Carson can make a respectable showing in Iowa, then win in South Carolina — or at least come in second should a home-state senator, Lindsey Graham, run — and come in second behind Bush or Senator Marco Rubio in their home state of Florida, he could be positioned to make a real run. But that would depend on avoiding pitfalls like Carson’s ill-considered comments on homosexuality. Rather than capitalizing on the chaos, Carson may only contribute to it.

Ben Carson is, in many ways, the ideal Republican presidential candidate. With a not-too-selective reading of his life story, conservative voters can — and do — see in him an inspiring, up-from-nowhere African-American who shares their beliefs, a right-wing answer to Barack Obama. Before he was born, his parents moved to Detroit from rural Tennessee as part of the second great migration. His father, Robert Solomon Carson, worked at a Cadillac factory. His mother, Sonya — who herself had grown up as one of 24 children and left school at third grade — cleaned houses. When Carson was 8, Sonya discovered that Robert was keeping a second family. She moved, with her two sons, into a rundown group house. It was in a part of town that Carson described to me as crawling with “big rats and roaches and all kinds of horrible things.” Sonya worked several jobs at a time and made up the shortfall with food stamps. (Carson has called for paring back the social safety net but not doing away with it.)

Carson recounts this story in his best-selling 1990 memoir, “Gifted Hands,” which also became the basis for a 2009 movie on TNT, starring Cuba Gooding Jr. as Carson. Raised as a Seventh Day Adventist, Carson realized that he wanted to become a physician during a church sermon about a missionary doctor who, while serving overseas, was almost attacked by thieves but found safety by putting his faith in God. When Carson, then 8, told his mother his new dream, “She said, ‘Absolutely, you could do it, you could do anything,’ ” he told me. Forced by his mother to read two extra books a week, he made it to Yale, then to medical school at the University of Michigan, where he decided to specialize in neurosurgery. He was selected for residency at Johns Hopkins Children’s Center, where he was named director of pediatric neurosurgery at 33, becoming the youngest person, and the first black person, to hold the title. He drew national attention by conducting a succession of operations that had never been performed successfully, most famously planning and managing the first separation of conjoined twins connected through major blood vessels in the brain.

Carson, a two-time Jimmy Carter voter, traces his conservative political awakening to a patient he met during the Reagan years. During a routine obstetrics rotation, he found himself treating an unwed pregnant teenager who had run away from her well-to-do parents. When Carson asked her how she was getting by, she informed him she was on public assistance; this led him to ponder the fact that the government was paying for the result of what he did not view as a “wise decision.” The incident, he says, fed his growing sense that the welfare system too often saps motivation and rewards irresponsible behavior. (When we spoke, he suggested that the government should cut off assistance to would-be unwed mothers, but only after warning them that it would do so within a certain amount of time, say five years. “I bet you’d see a dramatic decrease in unwed motherhood.”)

Carson’s friends at Hopkins say they do not remember him being particularly outspoken about his conservatism. He devoted most of his public engagement to urging poor kids in bad neighborhoods to use “these fancy brains God gave us,” through weekly school visits, student hospital tours and, ultimately, a multimillion-dollar scholarship program. “His issues were always medical care for the poor, education for the poor, equal opportunity — helping the less fortunate and really inspiring them as an example,” a mentor who named him to the chief pediatrics-neurosurgery post at Hopkins, Dr. Donlin Long, told me.

Even when Carson got the chance, in 1997, to speak in front of President Bill Clinton, at the national prayer breakfast, he mostly discussed the lack of role models for black children who were not sports stars or rappers. (There was possibly an oblique reference to Clinton’s sex scandals, when he told the audience that, if they are always honest, they won’t have to worry later about “skeletons in the closet.”)

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Ben Carson at CPAC on Feb. 26 in Oxon Hill, Md. Credit Dolly Faibyshev for The New York Times

In 2011, Carson’s politics took a strident turn, mirroring that of many in his party during the Obama years. “America the Beautiful,” his sixth book, which he wrote with Candy Carson, his wife of 39 years, included a get-tough-on-illegal-immigration message and offered anti-establishment praise for the Tea Party. It suggested that blacks who voted for Obama only because he was black were themselves practicing a form of racism. (Earlier this year he admitted to Buzzfeed that portions of the book were lifted directly from several sources without proper attribution.) His prayer-breakfast performance in 2013, and the extremity of his remarks in the months afterward (Obamacare is the worst thing since slavery; the United States is “very much like Nazi Germany”; allowing same-sex marriage could lead to allowing bestiality), left some of his old friends bewildered. Students at Johns Hopkins University School of Medicine protested his planned convocation address there in 2013, and he eventually backed out. When I asked Carson about the view at Hopkins that he had changed, he said his themes are still the same: “hard work, self-reliance, helping other people.” If he had become more overtly political, he said, it was only because the Obama years had led him to believe that “we’re really moving in a direction that is very, very destructive.”

None of this went unnoticed by campaign professionals. In August 2013, John Philip Sousa IV and Vernon Robinson, each of whom professes to be a virtual stranger to Carson, and who had previously been active in the anti-illegal-immigration movement, started the National Draft Ben Carson for President Committee. Sousa was just coming off a campaign to defend the sheriff of Maricopa County, Arizona, Joe Arpaio, from a recall effort, and he told me that he found Carson’s lack of political experience refreshing. “We have 500 guys and gals with probably a collective 5,000 years experience, and look at the mess we’re in,” he said.

Many others in the party feel the same way. Carson’s PAC finished 2014 with more than $13 million in donations, more than Ready for Hillary. Much of its money has gone toward further fund-raising, but Sousa — the great-grandson of the famous composer — points out that their effort has already built far more than just a war chest, organizing leaders in all 99 of Iowa’s counties. Regardless, Carson credits the fund-raising success of Sousa and Robinson with persuading him to enter the race.

Very early the morning after the job interview, Carson was in a black S.U.V., heading from Washington to the Gaylord National Resort and Convention Center in Oxon Hill, Md., where he was to give the opening candidate speech of the Conservative Political Action Conference. The event, which functions as an early tryout for Republican presidential contenders, tends to skew rightward in its audience, drawing many of the same sorts of people who shouted at Boehner in Tampa. As such, it tends to favor anti-establishment candidates, but the news leading up to this year’s event was that Jeb Bush hoped to make inroads there.

It was still dark when we set out, and I joked with Carson about the hour, telling him he’d better get used to it. He retorted that his career in pediatric brain surgery made him no stranger to early mornings. This is a big theme of Carson’s presidential pitch: that neither the rigors of the campaign nor those of the White House can faze a man who held children’s lives in his hands. His life in brain surgery has prepared him for the presidency, he maintains, better than lives in politics have for his rivals. At the very least, he says, it conditioned him against getting too worked up about any problem that isn’t life threatening. “I mean, it’s grueling, but interestingly enough, I don’t feel the pressure,” he said.

At the convention hall, we were quickly surrounded by admirers. Two women were already waiting to meet him — white, middle-aged volunteers for Carson’s super PAC, who had traveled from South Carolina. One of them, Chris Horne, was holding a dog-eared and taped Bible. A founding member of the Charleston Tea Party who went on to work for Gingrich’s successful South Carolina primary campaign in 2012, Horne lamented over the attacks that Carson was sure to face. “You served us, you served the Lord, just don’t let them steal that from you,” she said. Her friend told him, “You’ve got God behind you!” Such religious evocations trailed Carson constantly while I walked the CPAC floor with him. Evangelicals are impressed not only with his devotion to their politics but also with his career path; as one of them told me, what’s more pro-life than saving babies?

During our ride to the conference, Carson told me his speech was not looking to “feed the beast.” When his appointed time came, he kept his remarks as tame as promised. “Real compassion” meant “using our intellect” to help people “climb out of dependency and realize the American dream,” he said. The national debt is going to “destroy us,” Obamacare was about “redistribution and control,” but Republicans better come forward with their own alternative before they repeal it, he said.

Because his speech was first, and it started several minutes early, the auditorium was slow to fill. Still, the first day saw a crush of people seeking autographs and pictures as he roamed the hall. The Draft Carson committee’s 150 volunteers swarmed the auditorium, collecting emails and handing out “Run Ben Run” stickers. After a quick interview with Sean Hannity, the conservative-radio and Fox News host — his second in two days — Carson was off to Tampa.

In the hours that followed his talk, the hall offered a view in miniature of what the next 12 to 14 months might hold for the party. Chris Christie, sitting across from the tough-minded talk-radio host Laura Ingraham, boasted about his multiple vetoes of Planned Parenthood funding, his refusal to raise income taxes and his belief that “sometimes people need to be told to sit down and shut up.” Cruz, an audience favorite, warning his fellow Republicans against falling for a “squishy moderate,” declared, “Take all 125,000 I.R.S. agents and put ’em on our Southern border!” Gov. Scott Walker of Wisconsin, surging in polls, boasted that if he could face down the 100,000 union supporters who protested his legislation limiting collective bargaining for public employees, he could certainly handle ISIS. The next day, the traditional CPAC favorite Rand Paul spoke, packing the hall with his supporters who chanted “President Paul.” He warned, counter to the overall hawkish tenor of the event, that “we should not succumb to the notion that a government inept at home will somehow become successful abroad.” But he also vowed to end foreign aid to countries whose citizens are seen burning American flags. “Not one penny more to these haters of America.”

Perhaps the defining moment came near the end of the conference, when Jeb Bush spoke. In a neat trick of political gamesmanship — and a show of establishment muscle — his team had bused in an ample cheering section for the dozens of cameras on hand for his appearance. But a small contingent of Tea Party activists and Rand Paul supporters staged a walk out. When Bush began a question-and-answer session, they turned and left the auditorium to chant “U.S.A., U.S.A.” in the hallway, led by a man in colonial garb waving a huge “Don’t Tread on Me” banner. Plenty of other detractors stayed in the hall and peppered Bush’s remarks with booing as he stood by positions unpopular with the conservative grass roots: support for the Common Core standards and an immigration overhaul that provides a “path to legal status” for undocumented immigrants. Bush took it all in good humor, but finally seemed to give up.

“For those who made an ‘oo’ sound — is that what it was? — I’m marking you down as neutral,” he said. “And I want to be your second choice.”

Bush strategists told me they would not repeat Romney’s mistakes. Of course they would love to glide to an early nomination, they said, but they are prepared for a long contest and won’t be wasting any energy bending under pressure from a Paul or a Cruz or a Carson.

No one doubts that the pressure will increase, though. Despite the best wishes of the party’s leaders, GOP primary voters have given little indication that they will narrow the field quickly.

Before I left, I spotted Newt Gingrich, himself a fleeting presidential front-runner during those strange primary days of 2012. I asked him whether he thought all the party maneuvering — all the attempts to change the rules and fast-track the process — would preclude someone from presenting the sort of outside primary challenge he had carried out in the last election.

“No,” he told me, as if it was the most obvious thing in the world. “Look at where Ben Carson is right now.”

Jim Rutenberg is the chief political correspondent for the magazine. His most recent feature was about Megyn Kelly.

Ben Carson Says He’ll Seek 2016 G.O.P. Nomination

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Since a white police officer, Darren Wilson fatally shot unarmed black teenager, Michael Brown, in a confrontation last August in Ferguson, Mo., there have been many other cases in which the police have shot and killed suspects, some of them unarmed. Mr. Brown's death set off protests throughout the country, pushing law enforcement into the spotlight and sparking a public debate on police tactics. Here is a selection of police shootings that have been reported by news organizations since Mr. Brown's death. In some cases, investigations are continuing.

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The apartment complex northeast of Atlanta where Anthony Hill, 27, was fatally shot by a DeKalb County police officer. Credit Ben Gray/Atlanta Journal Constitution

Chamblee, Ga.
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Late in April, after Native American actors walked off in disgust from the set of Adam Sandler’s latest film, a western sendup that its distributor, Netflix, has defended as being equally offensive to all, a glow of pride spread through several Native American communities.

Tantoo Cardinal, a Canadian indigenous actress who played Black Shawl in “Dances With Wolves,” recalled thinking to herself, “It’s come.” Larry Sellers, who starred as Cloud Dancing in the 1990s television show “Dr. Quinn, Medicine Woman,” thought, “It’s about time.” Jesse Wente, who is Ojibwe and directs film programming at the TIFF Bell Lightbox in Toronto, found himself encouraged and surprised. There are so few film roles for indigenous actors, he said, that walking off the set of a major production showed real mettle.

But what didn’t surprise Mr. Wente was the content of the script. According to the actors who walked off the set, the film, titled “The Ridiculous Six,” included a Native American woman who passes out and is revived after white men douse her with alcohol, and another woman squatting to urinate while lighting a peace pipe. “There’s enough history at this point to have set some expectations around these sort of Hollywood depictions,” Mr. Wente said.

The walkout prompted a rhetorical “What do you expect from an Adam Sandler film?,” and a Netflix spokesman said that in the movie, blacks, Mexicans and whites were lampooned as well. But Native American actors and critics said a broader issue was at stake. While mainstream portrayals of native peoples have, Mr. Wente said, become “incrementally better” over the decades, he and others say, they remain far from accurate and reflect a lack of opportunities for Native American performers. What’s more, as Native Americans hunger for representation on screen, critics say the absence of three-dimensional portrayals has very real off-screen consequences.

“Our people are still healing from historical trauma,” said Loren Anthony, one of the actors who walked out. “Our youth are still trying to figure out who they are, where they fit in this society. Kids are killing themselves. They’re not proud of who they are.” They also don’t, he added, see themselves on prime time television or the big screen. Netflix noted while about five people walked off the “The Ridiculous Six” set, 100 or so Native American actors and extras stayed.

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But in interviews, nearly a dozen Native American actors and film industry experts said that Mr. Sandler’s humor perpetuated decades-old negative stereotypes. Mr. Anthony said such depictions helped feed the despondency many Native Americans feel, with deadly results: Native Americans have the highest suicide rate out of all the country’s ethnicities.

The on-screen problem is twofold, Mr. Anthony and others said: There’s a paucity of roles for Native Americans — according to the Screen Actors Guild in 2008 they accounted for 0.3 percent of all on-screen parts (those figures have yet to be updated), compared to about 2 percent of the general population — and Native American actors are often perceived in a narrow way.

In his Peabody Award-winning documentary “Reel Injun,” the Cree filmmaker Neil Diamond explored Hollywood depictions of Native Americans over the years, and found they fell into a few stereotypical categories: the Noble Savage, the Drunk Indian, the Mystic, the Indian Princess, the backward tribal people futilely fighting John Wayne and manifest destiny. While the 1990 film “Dances With Wolves” won praise for depicting Native Americans as fully fleshed out human beings, not all indigenous people embraced it. It was still told, critics said, from the colonialists’ point of view. In an interview, John Trudell, a Santee Sioux writer, actor (“Thunderheart”) and the former chairman of the American Indian Movement, described the film as “a story of two white people.”

“God bless ‘Dances with Wolves,’ ” Michael Horse, who played Deputy Hawk in “Twin Peaks,” said sarcastically. “Even ‘Avatar.’ Someone’s got to come save the tribal people.”

Dan Spilo, a partner at Industry Entertainment who represents Adam Beach, one of today’s most prominent Native American actors, said while typecasting dogs many minorities, it is especially intractable when it comes to Native Americans. Casting directors, he said, rarely cast them as police officers, doctors or lawyers. “There’s the belief that the Native American character should be on reservations or riding a horse,” he said.

“We don’t see ourselves,” Mr. Horse said. “We’re still an antiquated culture to them, and to the rest of the world.”

Ms. Cardinal said she was once turned down for the role of the wife of a child-abusing cop because the filmmakers felt that casting her would somehow be “too political.”

Another sore point is the long run of white actors playing American Indians, among them Burt Lancaster, Rock Hudson, Audrey Hepburn and, more recently, Johnny Depp, whose depiction of Tonto in the 2013 film “Lone Ranger,” was viewed as racist by detractors. There are, of course, exceptions. The former A&E series “Longmire,” which, as it happens, will now be on Netflix, was roundly praised for its depiction of life on a Northern Cheyenne reservation, with Lou Diamond Phillips, who is of Cherokee descent, playing a Northern Cheyenne man.

Others also point to the success of Mr. Beach, who played a Mohawk detective in “Law & Order: Special Victims Unit” and landed a starring role in the forthcoming D C Comics picture “Suicide Squad.” Mr. Beach said he had come across insulting scripts backed by people who don’t see anything wrong with them.

“I’d rather starve than do something that is offensive to my ancestral roots,” Mr. Beach said. “But I think there will always be attempts to drawn on the weakness of native people’s struggles. The savage Indian will always be the savage Indian. The white man will always be smarter and more cunning. The cavalry will always win.”

The solution, Mr. Wente, Mr. Trudell and others said, lies in getting more stories written by and starring Native Americans. But Mr. Wente noted that while independent indigenous film has blossomed in the last two decades, mainstream depictions have yet to catch up. “You have to stop expecting for Hollywood to correct it, because there seems to be no ability or desire to correct it,” Mr. Wente said.

There have been calls to boycott Netflix but, writing for Indian Country Today Media Network, which first broke news of the walk off, the filmmaker Brian Young noted that the distributor also offered a number of films by or about Native Americans.

The furor around “The Ridiculous Six” may drive more people to see it. Then one of the questions that Mr. Trudell, echoing others, had about the film will be answered: “Who the hell laughs at this stuff?”

Native American Actors Work to Overcome a Long-Documented Bias

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HOBART, Tasmania — Few places seem out of reach for China’s leader, Xi Jinping, who has traveled from European capitals to obscure Pacific and Caribbean islands in pursuit of his nation’s strategic interests.

So perhaps it was not surprising when he turned up last fall in this city on the edge of the Southern Ocean to put down a long-distance marker in another faraway region, Antarctica, 2,000 miles south of this Australian port.

Standing on the deck of an icebreaker that ferries Chinese scientists from this last stop before the frozen continent, Mr. Xi pledged that China would continue to expand in one of the few places on earth that remain unexploited by humans.

He signed a five-year accord with the Australian government that allows Chinese vessels and, in the future, aircraft to resupply for fuel and food before heading south. That will help secure easier access to a region that is believed to have vast oil and mineral resources; huge quantities of high-protein sea life; and for times of possible future dire need, fresh water contained in icebergs.

It was not until 1985, about seven decades after Robert Scott and Roald Amundsen raced to the South Pole, that a team representing Beijing hoisted the Chinese flag over the nation’s first Antarctic research base, the Great Wall Station on King George Island.

But now China seems determined to catch up. As it has bolstered spending on Antarctic research, and as the early explorers, especially the United States and Australia, confront stagnant budgets, there is growing concern about its intentions.

China’s operations on the continent — it opened its fourth research station last year, chose a site for a fifth, and is investing in a second icebreaker and new ice-capable planes and helicopters — are already the fastest growing of the 52 signatories to the Antarctic Treaty. That gentlemen’s agreement reached in 1959 bans military activity on the continent and aims to preserve it as one of the world’s last wildernesses; a related pact prohibits mining.

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But Mr. Xi’s visit was another sign that China is positioning itself to take advantage of the continent’s resource potential when the treaty expires in 2048 — or in the event that it is ripped up before, Chinese and Australian experts say.

“So far, our research is natural-science based, but we know there is more and more concern about resource security,” said Yang Huigen, director general of the Polar Research Institute of China, who accompanied Mr. Xi last November on his visit to Hobart and stood with him on the icebreaker, Xue Long, or Snow Dragon.

With that in mind, the polar institute recently opened a new division devoted to the study of resources, law, geopolitics and governance in Antarctica and the Arctic, Mr. Yang said.

Australia, a strategic ally of the United States that has strong economic relations with China, is watching China’s buildup in the Antarctic with a mix of gratitude — China’s presence offers support for Australia’s Antarctic science program, which is short of cash — and wariness.

“We should have no illusions about the deeper agenda — one that has not even been agreed to by Chinese scientists but is driven by Xi, and most likely his successors,” said Peter Jennings, executive director of the Australian Strategic Policy Institute and a former senior official in the Australian Department of Defense.

“This is part of a broader pattern of a mercantilist approach all around the world,” Mr. Jennings added. “A big driver of Chinese policy is to secure long-term energy supply and food supply.”

That approach was evident last month when a large Chinese agriculture enterprise announced an expansion of its fishing operations around Antarctica to catch more krill — small, protein-rich crustaceans that are abundant in Antarctic waters.

“The Antarctic is a treasure house for all human beings, and China should go there and share,” Liu Shenli, the chairman of the China National Agricultural Development Group, told China Daily, a state-owned newspaper. China would aim to fish up to two million tons of krill a year, he said, a substantial increase from what it currently harvests.

Because sovereignty over Antarctica is unclear, nations have sought to strengthen their claims over the ice-covered land by building research bases and naming geographic features. China’s fifth station will put it within reach of the six American facilities, and ahead of Australia’s three.

Chinese mappers have also given Chinese names to more than 300 sites, compared with the thousands of locations on the continent with English names.

In the unspoken competition for Antarctica’s future, scientific achievement can also translate into influence. Chinese scientists are driving to be the first to drill and recover an ice core containing tiny air bubbles that provide a record of climate change stretching as far back as 1.5 million years. It is an expensive and delicate effort at which others, including the European Union and Australia, have failed.

In a breakthrough a decade ago, European scientists extracted an ice core nearly two miles long that revealed 800,000 years of climate history. But finding an ice core going back further would allow scientists to examine a change in the earth’s climate cycles believed to have occurred 900,000 to 1.2 million years ago.

China is betting it has found the best location to drill, at an area called Dome A, or Dome Argus, the highest point on the East Antarctic Ice Sheet. Though it is considered one of the coldest places on the planet, with temperatures of 130 degrees below zero Fahrenheit, a Chinese expedition explored the area in 2005 and established a research station in 2009.

“The international community has drilled in lots of places, but no luck so far,” said Xiao Cunde, a member of the first party to reach the site and the deputy director of the Institute for Climate Change at the Chinese Academy of Meteorological Sciences. “We think at Dome A we will have a straight shot at the one-million-year ice core.”

Mr. Xiao said China had already begun drilling and hoped to find what scientists are looking for in four to five years.

To support its Antarctic aspirations, China is building a sophisticated $300 million icebreaker that is expected to be ready in a few years, said Xia Limin, deputy director of the Chinese Arctic and Antarctic Administration in Beijing. It has also bought a high-tech fixed-wing aircraft, outfitted in the United States, for taking sensitive scientific soundings from the ice.

China has chosen the site for its fifth research station at Inexpressible Island, named by a group of British explorers who were stranded at the desolate site in 1912 and survived the winter by excavating a small ice cave.

Mr. Xia said the inhospitable spot was ideal because China did not have a presence in that part of Antarctica, and because the rocky site did not have much snow, making it relatively cheap to build there.

Anne-Marie Brady, a professor of political science at the University of Canterbury in New Zealand and the author of a soon-to-be-released book, “China as a Polar Great Power,” said Chinese scientists also believed they had a good chance of finding mineral and energy resources near the site.

“China is playing a long game in Antarctica and keeping other states guessing about its true intentions and interests are part of its poker hand,” she said. But she noted that China’s interest in finding minerals was presented “loud and clear to domestic audiences” as the main reason it was investing in Antarctica.

Because commercial drilling is banned, estimates of energy and mineral resources in Antarctica rely on remote sensing data and comparisons with similar geological environments elsewhere, said Millard F. Coffin, executive director of the Institute for Marine and Antarctic Studies in Hobart.

But the difficulty of extraction in such severe conditions and uncertainty about future commodity prices make it unlikely that China or any country would defy the ban on mining anytime soon.

Tourism, however, is already booming. Travelers from China are still a relatively small contingent in the Antarctic compared with the more than 13,000 Americans who visited in 2013, and as yet there are no licensed Chinese tour operators.

But that is about to change, said Anthony Bergin, deputy director of the Australian Strategic Policy Institute. “I understand very soon there will be Chinese tourists on Chinese vessels with all-Chinese crew in the Antarctic,” he said.

 

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