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Saat ini, banyak tersedia buku dan tabel yang berisi tentang berat besi beton dengan diameternya, dalam tabel tersebut berat besi beton dihitung tiap 1 (satu) meter panjang (kg/m), yang jadi pertanyaan, apakah tiap waktu kita mesti bawa itu tabel / buku ?? gak kan !!..keliatan gak profesional dech ( amatiran he..he..he)
Mengetahui berat besi beton sangat mutlak diperlukan, dalam analisa pengerjaan Beton, tingginya harga per m3 beton faktor penentunya adalah koefesien berat besi beton tiap m³ Beton dan harga satuan dasar besi beton / kg di pasaran.

Untuk proyek-proyek pemerintah yang ditenderkan biasanya sudah disediakan draft analisa pekerjaan beton di dokumen lelang. CEK ULANG !! APAKAH KOEFISIEN BOBOT BESI SESUAI DENGAN BOBOT REAL LAPANGAN ( Panitia kadang membuat analisa berdasarkan BOW tanpa merubah koefisien Bobot Besi Beton)
Ini ada cara menghitung berat besi beton tanpa tabel, tapi yang jelas masih pake hitungan (he..he..he )
Rumus yang sudah jadi :
Berat per m' (kg/m') = 0,006162 x ز
Berat per batang (kg) = 0,006162 x 12 m' (panjang besi asli, dipasaran gak nyampek 12 m cuma 11.7 untuk besi marking )
Asal rumus :
Dengan menggunakan pendekatan rumus volume tabung.
Volume tabung = (0,25 x 3,14 x ز) x P x BJ
Keterangan :
Ø = diameter besi beton
P = panjang besi beton
BJ = berat jenis besi beton (7.850 kg/m³)
Rumus ini disederhanakan, sehingga menjadi :
Volume = 0.25 x 3.14 x ز (m²) x Panjang (m') x 7.850 kg/m³
               = 6.162,25 kg/m³ x ز (m²) x Panjang (m')
Contoh Perhitungan :
Menghitung berat besi Ø 10 mm per m' :
>>10 mm = 0,01 m
Sehingga menjadi :
= 6.162,25 kg/m³ x 0,01² (m²)
= 0,616225 kg/m'
Untuk 1 lonjor besi Ø 10 :
asumsi panjang 1 lonjor = 12 m
= 0,616225 kg/m' x 12 m
= 7,3947 kg
Demikian Cara Menghitung Berat Besi Beton, semoga bermanfaat

CARA MENGHITUNG BERAT BESI BETON

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HIJAU DAUN SETIAP DETIK

Bandung, Saco-Indonesia.com - Hermain Tjiknang (91) mengikuti prosesi wisuda menggunakan kursi roda di Graha Sanusi Universitas Padjadjaran, Jalan Dipati Ukur, Bandung, Selasa (4/2/2014) lalu. Peraih gelar doktor Ilmu Hukum kelahiran Muntok, Bangka, 26 Juni 1922 ini tercatat sebagai wisudawan tertua.

Tentu, sosok Hermain Tjiknang menjadi sorotan dan tidak sedikit hadirin yang berdecak kagum untuk wisudawan lulusan gelombang II Unpad Tahun Akademik 2013/2014 itu.

Bukan karena saat wisuda Hermain menggunakan kursi roda, tapi ketika tahu bahwa usia Hermain sudah mencapai 91 tahun lebih 7 bulan.

Ya, Hermain memang menjadi wisudawan paling tua, namun semangatnya terlihat saat ia ditanya oleh wisudawan lain.
Sebelumnya tercatat, Mooryati Soedibyo adalah peraih gelar doktor tertua di Indonesia menurut Museum Rekor Dunia-Indonesia (Muri) ketika lulus S3 dari Fakultas Ekonomi Universitas Indonesia pada tahun 2007.

Di Unpad, pada wisuda tahun 2010, Siti Maryam Salahuddin juga meraih gelar doktor pada usia 83 tahun. Melihat catatan tersebut, bisa jadi Hermain adalah peraih gelar doktor tertua di Indonesia saat ini.

Bukanlah hal mudah bagi Hermain yang di usia 90 tahun harus menyelesaikan disertasi. Bahkan disertasinya yang berjudul "Perlindungan Hukum Atas Pekerja Alih Daya (Outsourcing) Berdasarkan Keadilan dalam Perselisihan Hubungan Industrial Akibat Pemutusan Hubungan Kerja Sepihak", sampai tujuh kali direvisi oleh promotornya.

Namun karena semangatnya, dia berhasil menyelesaikan program Doktornya dalam waktu lima tahun.

"Sebenarnya banyak kendala, tapi karena saya memang ingin mempertahankan disertasi ini, akhirnya selesai juga," katanya ditemui seusai wisuda.

Tak terbatas usiaMenurut lelaki yang masih aktif bertugas sebagai dosen di STIH Pertiba, Pangkalpinang ini, menuntut ilmu tidak terbatas usia. Selagi keinginan masih ada, usia bukanlah halangan untuk memperdalam ilmu.

Terlebih sebagai dosen, ia merasa sudah kewajibannya untuk mendapatkan ilmu lebih banyak untuk dibagi kepada mahasiswanya.

"Usia boleh tua, tapi belajar tidak ada batasan," kata lelaki yang meraih gelar Doktor pada Sidang Terbuka Promosi Doktor pada 17 Januari 2014 lalu ini.

Karena masih ingin membagi ilmu inilah, Hermain masih menyempatkan datang ke kampus untuk mengajar Ilmu Hukum untuk mahasiswa sarjana dan magister. Tiga kali dalam seminggu, ia mengajar di perguruan tinggi yang juga didirikan oleh Hermain bersama rekan-rekannya di tahun 1982 tersebut.

Merasakan masih haus akan ilmu jugalah, yang membulatkan tekadnya untuk mengambil doktor Ilmu Hukum di Unpad. Ia harus berkuliah hingga menyeberang pulau karena ia bersama keluarga telah menetap di Bangka.

"Saya sudah cinta dengan dunia pendidikan," kata lelaki asal Palembang ini.

Stres
Sakit jantung yang dialaminya itu sempat pula membuatnya harus  masuk intensive care unit (ICU) rumah sakit saat dia tengah menyusun disertasi. "Gara-gara stres karena flash disk naskahnya dikira hilang," kata putri sulungnya, Suzanna Indrawati.

Beruntung, ternyata data itu ternyata berada di tangan asistennya.

Kecintaannya terhadap dunia pendidikan sudah ditunjukkan saat masa penjajahan Belanda. Ia sempat mengajar pejuang-pejuang. Bagi Hermain, dengan pendidikan, Indonesia bisa menjadi negara merdeka dan maju.

"Pendidikan, mencari ilmu itu harus. Apalagi buat generasi muda, agar Indonesia maju," kata suami dari Federika Henderika dan ayah dari lima anak ini.

Ia mengaku sedih bila ada generasi muda yang tidak semangat bersekolah. Karena saat ini ia melihat menuntut ilmu jauh lebih baik dan lebih mudah. Dengan kemajuan teknologi, seharusnya generasi muda semakin bersemangat.

BanggaYashinta, anak Hermain yang menemani wisuda ayahnya mengaku bangga. Meski terkadang ia tidak tega melihat ayahnya menyusun disertasi hingga larut malam.

"Ayah saya sudah tua, tapi sampai malam masih nyusun disertasinya, kadang suruh istirahat, nanti dulu katanya, karena pengen cepat selesai," katanya. 

Ia juga tidak bisa menahan keinginan ayahnya yang masih ingin terus mengajar. Karena ia sudah memahami karakter ayahnya yang sudah mencintai dunia pendidikan.

Sumber :kompas.com

Editor : Maulana Lee

Tetap Semangat di Usia 91 Tahun, Bagi Wisudawan Tertua Universitas Padjadjaran

Dijual rumah masih asli di Kompl. SBS (Harapan Jaya) Bekasi.
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DIJUAL RUMAH ASLI DI KOMPL. SBS (HARPAN JAYA) - BEKASI.

Saco-Indonesia.com - Menjelang pameran Computex 2013 tanggal 4 Juni besok di Taiwan, Intel mengumumkan sejumlah model prosesor Core i Generasi ke-4 (Haswell). Batch pertama ini terdiri dari model-model quad core papan atas untuk desktop dan mobile.

Total terdapat lima model prosesor laptop Core i7 dan 12 prosesor desktop Core i7 dan Core i5 yang diperkenalkan.

Seperti dikutip dari Venture Beat, untuk chip mobile, di urutan teratas ada Core i7 4930MX (3-3,9 GHz, 57 watt) seharga 1.096 dollar AS atau sekitar Rp 10,5 juta.

Di bawahnya menyusul Core i7-4800MQ dan Core i7-4900MQ yang masing-masing dihargai 278 dollar AS dan 568 dollar AS. Ketiga prosesor ini diperkuat pemroses grafis Intel 4600. Intel berencana merilis 13 model prosesor Haswell seri M tahun ini.

Ada pula chip mobile seri H berupa Core i7-4850HQ yang dibanderol seharga 468 dollar AS dan memiliki rentang frekuensi kerja 2,3 GHz hingga 3,5 GHz. Model lain dalam seri ini adalah Core i7-4950HQ (657 dollar AS) dengan rentang frekuensi 2,4 GHz hingga 3,6 GHz.

Kedua chip di atas mengkonsumsi daya sebesar 47 watt dan dilengkapi pemroses grafis high-end Iris. Tahun ini, ada enam model chip Haswell seri H yang akan dirilis.

Untuk desktop, Intel mengumumkan beberapa chip dengan range harga 192 dollar AS hingga 339 dollar AS. Kecepatan mereka bervariasi antara 3 Ghz hingga 3,9 GHz.

Chip desktop di urutan teratas (339 dollar AS) adalah Core i7-4770K yang diklaim sanggup menjalankan game StarCraft II: The Heart of the Swarm dengan frame rate 62 FPS. Sebagai prosesor dengan multiplier terbuka, kecepatan chip ini juga bisa digenjot lebih jauh dengan mudah melalui teknik overclocking.

Momen penting

Model-model prosesor baru yang mengusung arsitektur Haswell ini dijanjikan bakal meningkatkan daya tahan baterai notebook hingga 50 persen dibandingkan generasi terdahulu (Ivy Bridge), dengan kemampuan olah grafis yang dua kali lebih kencang.

Dari sisi kemampuan CPU, peningkatannya diklaim hanya sebesar 5 hingga 15 persen.

Peluncuran Haswell pada pameran Computex tahun ini adalah momen penting untuk para pelaku bisnis komputer. Prosesor baru dari Intel itu diharapkan bisa menyelamatkan industri PC yang pada 2013 diprediksi bakal mengalami penurunan 7,8 persen, menurut perkiraan IDC minggu lalu.

Sejumlah produsen PC pun berinovasi menanamkan Haswell dalam berbagai konsep komputer unik, seperti tablet yang bisa berubah menjadi laptop dengan docking keyboard.

Dengan Haswell, Intel menjanjikan desain-desain unik semacam itu bakal bertambah banyak sepanjang tahun ini. Laptop baru dengan prosesor Haswell diklaim bakal lebih tpis dan lebih murah, dengan kisaran harga di bawah 500 dollar AS.

Editor:Liwon Maulana
Sumber:Kompas.com
Berapa Harga Sebuah Prosesor

Imagine an elite professional services firm with a high-performing, workaholic culture. Everyone is expected to turn on a dime to serve a client, travel at a moment’s notice, and be available pretty much every evening and weekend. It can make for a grueling work life, but at the highest levels of accounting, law, investment banking and consulting firms, it is just the way things are.

Except for one dirty little secret: Some of the people ostensibly turning in those 80- or 90-hour workweeks, particularly men, may just be faking it.

Many of them were, at least, at one elite consulting firm studied by Erin Reid, a professor at Boston University’s Questrom School of Business. It’s impossible to know if what she learned at that unidentified consulting firm applies across the world of work more broadly. But her research, published in the academic journal Organization Science, offers a way to understand how the professional world differs between men and women, and some of the ways a hard-charging culture that emphasizes long hours above all can make some companies worse off.

Photo
 
Credit Peter Arkle

Ms. Reid interviewed more than 100 people in the American offices of a global consulting firm and had access to performance reviews and internal human resources documents. At the firm there was a strong culture around long hours and responding to clients promptly.

“When the client needs me to be somewhere, I just have to be there,” said one of the consultants Ms. Reid interviewed. “And if you can’t be there, it’s probably because you’ve got another client meeting at the same time. You know it’s tough to say I can’t be there because my son had a Cub Scout meeting.”

Some people fully embraced this culture and put in the long hours, and they tended to be top performers. Others openly pushed back against it, insisting upon lighter and more flexible work hours, or less travel; they were punished in their performance reviews.

The third group is most interesting. Some 31 percent of the men and 11 percent of the women whose records Ms. Reid examined managed to achieve the benefits of a more moderate work schedule without explicitly asking for it.

They made an effort to line up clients who were local, reducing the need for travel. When they skipped work to spend time with their children or spouse, they didn’t call attention to it. One team on which several members had small children agreed among themselves to cover for one another so that everyone could have more flexible hours.

A male junior manager described working to have repeat consulting engagements with a company near enough to his home that he could take care of it with day trips. “I try to head out by 5, get home at 5:30, have dinner, play with my daughter,” he said, adding that he generally kept weekend work down to two hours of catching up on email.

Despite the limited hours, he said: “I know what clients are expecting. So I deliver above that.” He received a high performance review and a promotion.

What is fascinating about the firm Ms. Reid studied is that these people, who in her terminology were “passing” as workaholics, received performance reviews that were as strong as their hyper-ambitious colleagues. For people who were good at faking it, there was no real damage done by their lighter workloads.

It calls to mind the episode of “Seinfeld” in which George Costanza leaves his car in the parking lot at Yankee Stadium, where he works, and gets a promotion because his boss sees the car and thinks he is getting to work earlier and staying later than anyone else. (The strategy goes awry for him, and is not recommended for any aspiring partners in a consulting firm.)

A second finding is that women, particularly those with young children, were much more likely to request greater flexibility through more formal means, such as returning from maternity leave with an explicitly reduced schedule. Men who requested a paternity leave seemed to be punished come review time, and so may have felt more need to take time to spend with their families through those unofficial methods.

The result of this is easy to see: Those specifically requesting a lighter workload, who were disproportionately women, suffered in their performance reviews; those who took a lighter workload more discreetly didn’t suffer. The maxim of “ask forgiveness, not permission” seemed to apply.

It would be dangerous to extrapolate too much from a study at one firm, but Ms. Reid said in an interview that since publishing a summary of her research in Harvard Business Review she has heard from people in a variety of industries describing the same dynamic.

High-octane professional service firms are that way for a reason, and no one would doubt that insane hours and lots of travel can be necessary if you’re a lawyer on the verge of a big trial, an accountant right before tax day or an investment banker advising on a huge merger.

But the fact that the consultants who quietly lightened their workload did just as well in their performance reviews as those who were truly working 80 or more hours a week suggests that in normal times, heavy workloads may be more about signaling devotion to a firm than really being more productive. The person working 80 hours isn’t necessarily serving clients any better than the person working 50.

In other words, maybe the real problem isn’t men faking greater devotion to their jobs. Maybe it’s that too many companies reward the wrong things, favoring the illusion of extraordinary effort over actual productivity.

How Some Men Fake an 80-Hour Workweek, and Why It Matters

Mr. Miller, of the firm Weil, Gotshal & Manges, represented companies including Lehman Brothers, General Motors and American Airlines, and mentored many of the top Chapter 11 practitioners today.

Harvey R. Miller, Renowned Bankruptcy Lawyer, Dies at 82

The live music at the Vice Media party on Friday shook the room. Shane Smith, Vice’s chief executive, was standing near the stage — with a drink in his hand, pants sagging, tattoos showing — watching the rapper-cum-chef Action Bronson make pizzas.

The event was an after-party, a happy-hour bacchanal for the hundreds of guests who had come for Vice’s annual presentation to advertisers and agencies that afternoon, part of the annual frenzy for ad dollars called the Digital Content NewFronts. Mr. Smith had spoken there for all of five minutes before running a slam-bang highlight reel of the company’s shows that had titles like “Weediquette” and “Gaycation.”

In the last year, Vice has secured $500 million in financing and signed deals worth hundreds of millions of dollars with established media companies like HBO that are eager to engage the young viewers Vice attracts. Vice said it was now worth at least $4 billion, with nearly $1 billion in projected revenue for 2015. It is a long way from Vice’s humble start as a free magazine in 1994.

Photo
 
At the Vice after-party, the rapper Action Bronson, a host of a Vice show, made a pizza. Credit Jesse Dittmar for The New York Times

But even as cash flows freely in Vice’s direction, the company is trying to keep its brash, insurgent image. At the party on Friday, it plied guests with beers and cocktails. Its apparently unrehearsed presentation to advertisers was peppered with expletives. At one point, the director Spike Jonze, a longtime Vice collaborator, asked on stage if Mr. Smith had been drinking.

“My assistant tried to cut me off,” Mr. Smith replied. “I’m on buzz control.”

Now, Vice is on the verge of getting its own cable channel, which would give the company a traditional outlet for its slate of non-news programming. If all goes as planned, A&E Networks, the television group owned by Hearst and Disney, will turn over its History Channel spinoff, H2, to Vice.

The deal’s announcement was expected last week, but not all of A&E’s distribution partners — the cable and satellite TV companies that carry the network’s channels — have signed off on the change, according to a person familiar with the negotiations who spoke on the condition of anonymity because the talks were private.

A cable channel would be a further step in a transformation for Vice, from bad-boy digital upstart to mainstream media company.

Keen for the core audience of young men who come to Vice, media giants like 21st Century Fox, Time Warner and Disney all showed interest in the company last year. Vice ultimately secured $500 million in financing from A&E Networks and Technology Crossover Ventures, a Silicon Valley venture capital firm that has invested in Facebook and Netflix.

Those investments valued Vice at more than $2.5 billion. (In 2013, Fox bought a 5 percent stake for $70 million.)

Then in March, HBO announced that it had signed a multiyear deal to broadcast a daily half-hour Vice newscast. Vice already produces a weekly newsmagazine show, called “Vice,” for the network. That show will extend its run through 2018, with an increase to 35 episodes a year, from 14.

Michael Lombardo, HBO’s president for programming, said when the deal was announced that it was “certainly one of our biggest investments with hours on the air.”

Vice, based in Brooklyn, also recently signed a multiyear $100 million deal with Rogers Communications, a Canadian media conglomerate, to produce original content for TV, smartphone and desktop viewers.

Vice’s finances are private, but according to an internal document reviewed by The New York Times and verified by a person familiar with the company’s financials, the company is on track to make about $915 million in revenue this year.

Photo
 
Vice showed a highlight reel of its TV series at the NewFronts last week in New York. Credit Jesse Dittmar for The New York Times

It brought in $545 million in a strong first quarter, which included portions of the new HBO deal and the Rogers deal, according to the document. More of its revenue now comes from these types of content partnerships, compared with the branded content deals that made up much of its revenue a year ago, the company said.

Mr. Smith said the company was worth at least $4 billion. If the valuation gets much higher, he said he would consider taking the company public.

“I don’t care about money; we have plenty of money,” Mr. Smith, who is Vice’s biggest shareholder, said in an interview after the presentation on Friday. “I care about strategic deals.”

In the United States, Vice Media had 35.2 million unique visitors across its sites in March, according to comScore.

The third season of Vice’s weekly HBO show has averaged 1.8 million viewers per episode, including reruns, through April 12, according to Brad Adgate, the director of research at Horizon Media. (Vice said the show attracted three million weekly viewers when repeat broadcasts, online and on-demand viewings were included.)

For years, Mr. Smith has criticized traditional TV, calling it slow and unable to draw younger viewers. But if all the deals Vice has struck are to work out, Mr. Smith may have to play more by the rules of traditional media. James Murdoch, Rupert Murdoch’s son and a member of Vice’s board, was at the company’s presentation on Friday, as were other top media executives.

“They know they need people like me to help them, but they can’t get out of their own way,” Mr. Smith said in the interview Friday. “My only real frustration is we’re used to being incredibly dynamic, and they’re not incredibly dynamic.”

With its own television channel in the United States, Vice would have something it has long coveted even as traditional media companies are looking beyond TV. Last year, Vice’s deal with Time Warner failed in part because the two companies could not agree on how much control Vice would have over a 24-hour television network.

Vice said it intended to fill its new channel with non-news programming. The company plans to have sports shows, fashion shows, food shows and the “Gaycation” travel show with the actress Ellen Page. It is also in talks with Kanye West about a show.

It remains to be seen whether Vice’s audience will watch a traditional cable channel. Still, Vice has effectively presold all of the ad spots to two of the biggest advertising agencies for the first three years, Mr. Smith said.

In the meantime, Mr. Smith is enjoying Vice’s newfound role as a potential savior of traditional media companies.

“I’m a C.E.O. of a content company,” Mr. Smith said before he caught a flight to Las Vegas for the boxing match on Saturday between Floyd Mayweather Jr. and Manny Pacquiao. “If it stops being fun, then why are you doing it?”

As Vice Moves More to TV, It Tries to Keep Brash Voice

Mr. Pfaff was an international affairs columnist and author who found Washington’s intervention in world affairs often misguided.

William Pfaff, Critic of American Foreign Policy, Dies at 86

Mr. Haroche was a founder of Liberty Travel, which grew from a two-man operation to the largest leisure travel operation in the United States.

Gilbert Haroche, Builder of an Economy Travel Empire, Dies at 87

Fullmer, who reigned when fight clubs abounded and Friday night fights were a television staple, was known for his title bouts with Sugar Ray Robinson and Carmen Basilio.

Gene Fullmer, a Brawling Middleweight Champion, Dies at 83

Ms. Turner and her twin sister founded the Love Kitchen in 1986 in a church basement in Knoxville, Tenn., and it continues to provide clothing and meals.

Ellen Turner Dies at 87; Opened Kitchen to Feed the Needy of Knoxville

As he reflected on the festering wounds deepened by race and grievance that have been on painful display in America’s cities lately, President Obama on Monday found himself thinking about a young man he had just met named Malachi.

A few minutes before, in a closed-door round-table discussion at Lehman College in the Bronx, Mr. Obama had asked a group of black and Hispanic students from disadvantaged backgrounds what could be done to help them reach their goals. Several talked about counseling and guidance programs.

“Malachi, he just talked about — we should talk about love,” Mr. Obama told a crowd afterward, drifting away from his prepared remarks. “Because Malachi and I shared the fact that our dad wasn’t around and that sometimes we wondered why he wasn’t around and what had happened. But really, that’s what this comes down to is: Do we love these kids?”

Many presidents have governed during times of racial tension, but Mr. Obama is the first to see in the mirror a face that looks like those on the other side of history’s ledger. While his first term was consumed with the economy, war and health care, his second keeps coming back to the societal divide that was not bridged by his election. A president who eschewed focusing on race now seems to have found his voice again as he thinks about how to use his remaining time in office and beyond.

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Obama Speaks of a ‘Sense of Unfairness’

Obama Speaks of a ‘Sense of Unfairness’

At an event announcing the creation of a nonprofit focusing on young minority men, President Obama talked about the underlying reasons for recent protests in Baltimore and other cities.

By Associated Press on Publish Date May 4, 2015. Photo by Stephen Crowley/The New York Times.

In the aftermath of racially charged unrest in places like Baltimore, Ferguson, Mo., and New York, Mr. Obama came to the Bronx on Monday for the announcement of a new nonprofit organization that is being spun off from his White House initiative called My Brother’s Keeper. Staked by more than $80 million in commitments from corporations and other donors, the new group, My Brother’s Keeper Alliance, will in effect provide the nucleus for Mr. Obama’s post-presidency, which will begin in January 2017.

“This will remain a mission for me and for Michelle not just for the rest of my presidency but for the rest of my life,” Mr. Obama said. “And the reason is simple,” he added. Referring to some of the youths he had just met, he said: “We see ourselves in these young men. I grew up without a dad. I grew up lost sometimes and adrift, not having a sense of a clear path. The only difference between me and a lot of other young men in this neighborhood and all across the country is that I grew up in an environment that was a little more forgiving.”

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Organizers said the new alliance already had financial pledges from companies like American Express, Deloitte, Discovery Communications and News Corporation. The money will be used to help companies address obstacles facing young black and Hispanic men, provide grants to programs for disadvantaged youths, and help communities aid their populations.

Joe Echevarria, a former chief executive of Deloitte, the accounting and consulting firm, will lead the alliance, and among those on its leadership team or advisory group are executives at PepsiCo, News Corporation, Sprint, BET and Prudential Group Insurance; former Secretary of State Colin L. Powell; Senator Cory Booker, Democrat of New Jersey; former Attorney General Eric H. Holder Jr.; the music star John Legend; the retired athletes Alonzo Mourning, Jerome Bettis and Shaquille O’Neal; and the mayors of Indianapolis, Sacramento and Philadelphia.

The alliance, while nominally independent of the White House, may face some of the same questions confronting former Secretary of State Hillary Rodham Clinton as she begins another presidential campaign. Some of those donating to the alliance may have interests in government action, and skeptics may wonder whether they are trying to curry favor with the president by contributing.

“The Obama administration will have no role in deciding how donations are screened and what criteria they’ll set at the alliance for donor policies, because it’s an entirely separate entity,” Josh Earnest, the White House press secretary, told reporters on Air Force One en route to New York. But he added, “I’m confident that the members of the board are well aware of the president’s commitment to transparency.”

The alliance was in the works before the disturbances last week after the death of Freddie Gray, the black man who suffered fatal injuries while in police custody in Baltimore, but it reflected the evolution of Mr. Obama’s presidency. For him, in a way, it is coming back to issues that animated him as a young community organizer and politician. It was his own struggle with race and identity, captured in his youthful memoir, “Dreams From My Father,” that stood him apart from other presidential aspirants.

But that was a side of him that he kept largely to himself through the first years of his presidency while he focused on other priorities like turning the economy around, expanding government-subsidized health care and avoiding electoral land mines en route to re-election.

After securing a second term, Mr. Obama appeared more emboldened. Just a month after his 2013 inauguration, he talked passionately about opportunity and race with a group of teenage boys in Chicago, a moment aides point to as perhaps the first time he had spoken about these issues in such a personal, powerful way as president. A few months later, he publicly lamented the death of Trayvon Martin, a black Florida teenager, saying that “could have been me 35 years ago.”

Photo
 
President Obama on Monday with Darinel Montero, a student at Bronx International High School who introduced him before remarks at Lehman College in the Bronx. Credit Stephen Crowley/The New York Times

That case, along with public ruptures of anger over police shootings in Ferguson and elsewhere, have pushed the issue of race and law enforcement onto the public agenda. Aides said they imagined that with his presidency in its final stages, Mr. Obama might be thinking more about what comes next and causes he can advance as a private citizen.

That is not to say that his public discussion of these issues has been universally welcomed. Some conservatives said he had made matters worse by seeming in their view to blame police officers in some of the disputed cases.

“President Obama, when he was elected, could have been a unifying leader,” Senator Ted Cruz of Texas, a Republican candidate for president, said at a forum last week. “He has made decisions that I think have inflamed racial tensions.”

On the other side of the ideological spectrum, some liberal African-American activists have complained that Mr. Obama has not done enough to help downtrodden communities. While he is speaking out more, these critics argue, he has hardly used the power of the presidency to make the sort of radical change they say is necessary.

The line Mr. Obama has tried to straddle has been a serrated one. He condemns police brutality as he defends most officers as honorable. He condemns “criminals and thugs” who looted in Baltimore while expressing empathy with those trapped in a cycle of poverty and hopelessness.

In the Bronx on Monday, Mr. Obama bemoaned the death of Brian Moore, a plainclothes New York police officer who had died earlier in the day after being shot in the head Saturday on a Queens street. Most police officers are “good and honest and fair and care deeply about their communities,” even as they put their lives on the line, Mr. Obama said.

“Which is why in addressing the issues in Baltimore or Ferguson or New York, the point I made was that if we’re just looking at policing, we’re looking at it too narrowly,” he added. “If we ask the police to simply contain and control problems that we ourselves have been unwilling to invest and solve, that’s not fair to the communities, it’s not fair to the police.”

Moreover, if society writes off some people, he said, “that’s not the kind of country I want to live in; that’s not what America is about.”

His message to young men like Malachi Hernandez, who attends Boston Latin Academy in Massachusetts, is not to give up.

“I want you to know you matter,” he said. “You matter to us.”

Advertisement Politics Obama Finds a Bolder Voice on Race Issues

Ms. Pryor, who served more than two decades in the State Department, was the author of well-regarded biographies of the founder of the American Red Cross and the Confederate commander.

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Though Robin and Joan Rolfs owned two rare talking dolls manufactured by Thomas Edison’s phonograph company in 1890, they did not dare play the wax cylinder records tucked inside each one.

The Rolfses, longtime collectors of Edison phonographs, knew that if they turned the cranks on the dolls’ backs, the steel phonograph needle might damage or destroy the grooves of the hollow, ring-shaped cylinder. And so for years, the dolls sat side by side inside a display cabinet, bearers of a message from the dawn of sound recording that nobody could hear.

In 1890, Edison’s dolls were a flop; production lasted only six weeks. Children found them difficult to operate and more scary than cuddly. The recordings inside, which featured snippets of nursery rhymes, wore out quickly.

Yet sound historians say the cylinders were the first entertainment records ever made, and the young girls hired to recite the rhymes were the world’s first recording artists.

Year after year, the Rolfses asked experts if there might be a safe way to play the recordings. Then a government laboratory developed a method to play fragile records without touching them.

Audio

The technique relies on a microscope to create images of the grooves in exquisite detail. A computer approximates — with great accuracy — the sounds that would have been created by a needle moving through those grooves.

In 2014, the technology was made available for the first time outside the laboratory.

“The fear all along is that we don’t want to damage these records. We don’t want to put a stylus on them,” said Jerry Fabris, the curator of the Thomas Edison Historical Park in West Orange, N.J. “Now we have the technology to play them safely.”

Last month, the Historical Park posted online three never-before-heard Edison doll recordings, including the two from the Rolfses’ collection. “There are probably more out there, and we’re hoping people will now get them digitized,” Mr. Fabris said.

The technology, which is known as Irene (Image, Reconstruct, Erase Noise, Etc.), was developed by the particle physicist Carl Haber and the engineer Earl Cornell at Lawrence Berkeley. Irene extracts sound from cylinder and disk records. It can also reconstruct audio from recordings so badly damaged they were deemed unplayable.

“We are now hearing sounds from history that I did not expect to hear in my lifetime,” Mr. Fabris said.

The Rolfses said they were not sure what to expect in August when they carefully packed their two Edison doll cylinders, still attached to their motors, and drove from their home in Hortonville, Wis., to the National Document Conservation Center in Andover, Mass. The center had recently acquired Irene technology.

Audio

Cylinders carry sound in a spiral groove cut by a phonograph recording needle that vibrates up and down, creating a surface made of tiny hills and valleys. In the Irene set-up, a microscope perched above the shaft takes thousands of high-resolution images of small sections of the grooves.

Stitched together, the images provide a topographic map of the cylinder’s surface, charting changes in depth as small as one five-hundredth the thickness of a human hair. Pitch, volume and timbre are all encoded in the hills and valleys and the speed at which the record is played.

At the conservation center, the preservation specialist Mason Vander Lugt attached one of the cylinders to the end of a rotating shaft. Huddled around a computer screen, the Rolfses first saw the wiggly waveform generated by Irene. Then came the digital audio. The words were at first indistinct, but as Mr. Lugt filtered out more of the noise, the rhyme became clearer.

“That was the Eureka moment,” Mr. Rolfs said.

In 1890, a girl in Edison’s laboratory had recited:

There was a little girl,

And she had a little curl

Audio

Right in the middle of her forehead.

When she was good,

She was very, very good.

But when she was bad, she was horrid.

Recently, the conservation center turned up another surprise.

In 2010, the Woody Guthrie Foundation received 18 oversize phonograph disks from an anonymous donor. No one knew if any of the dirt-stained recordings featured Guthrie, but Tiffany Colannino, then the foundation’s archivist, had stored them unplayed until she heard about Irene.

Last fall, the center extracted audio from one of the records, labeled “Jam Session 9” and emailed the digital file to Ms. Colannino.

“I was just sitting in my dining room, and the next thing I know, I’m hearing Woody,” she said. In between solo performances of “Ladies Auxiliary,” “Jesus Christ,” and “Dead or Alive,” Guthrie tells jokes, offers some back story, and makes the audience laugh. “It is quintessential Guthrie,” Ms. Colannino said.

The Rolfses’ dolls are back in the display cabinet in Wisconsin. But with audio stored on several computers, they now have a permanent voice.

Ghostly Voices From Thomas Edison’s Dolls Can Now Be Heard

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