Jumat, 12 Desember 2008

[FISIKA] Digest Number 2612

Messages In This Digest (5 Messages)

Messages

1.

Greens Functions

Posted by: "Elsa Melfiana" elsa_melfiana@yahoo.com   elsa_melfiana

Thu Dec 11, 2008 2:50 am (PST)

Dear All,

Saya mohon bantuan teman-teman. Saat ini saya sedang mengerjakan tugas tentang 2D water wave (homogeneous). Saya disuruh mengerjakannya dgn menggunakan Greens Function. Adakah diantara teman2 yang mengerti dgn fungsi tsb? or kira2 referensi yg cocok?

Thaks before
Elsa

Buat sendiri desain eksklusif Messenger Pingbox Anda sekarang! Membuat tempat chat pribadi di blog Anda sekarang sangatlah mudah. http://id.messenger.yahoo.com/pingbox/
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2.

Obama Picks Physicist Chu as Energy Secretary

Posted by: "Raja Elang" raja.elang@yahoo.fr   raja.elang

Thu Dec 11, 2008 8:22 am (PST)


Obama Picks Physicist Chu as Energy Secretary

Topics:Energy | Alternative Energy | Barack Obama | White House | Congress | Politics & Government

CNBC.com Staff with Reuters | 10 Dec 2008 | 05:50 PM ET

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U.S. President-elect Barack Obama will nominate Steven Chu, director of the Lawrence Berkeley National Laboratory, as his energy secretary, NBC News reported.

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Chu shared the 1997 Nobel Prize in physics and is a former chairman of the physics department at Stanford University in California and head of the electronics research laboratory at Bell Labs.
The announcement will not be announced officially this week.
Obama also will name Lisa Jackson, currently a New Jersey environmental official, as EPA administrator and Carol Browner, a former Environmental Protection Agency Administrator, as energy "czar" reporting to the President.
Whether Browner's position will be a cabinet-level appointment is not clear, NBC said.

U.S. Dept. of Energy - Berkeley National Lab
Stephen Chu

The Lawrence Berkeley Web site says Chu was an early advocate for finding scientific solutions to climate change and has guided the laboratory on a new mission to become the world leader in alternative and renewable energy research, particularly the development of carbon-neutral sources of energy.
That experience will be useful as the next energy secretary, as Obama wants to spend billions of dollars to promote alternative energy sources and create millions of green energy jobs.
A spokesman for the Lawrence Berkeley laboratory offered no comment on the prospect of Chu becoming the next energy secretary. Chu is traveling abroad in Asia and Europe and will be back at work on Monday, he said.
Chu will have to work closely with a new White House council that would coordinate energy and climate policy among the various federal agencies.
Browner, a principal at global strategy firm The Albright Group, heads Obama's advisory team on energy and the environment.
© 2008 CNBC.com
 
Steven Chu

From Wikipedia, the free encyclopedia

Jump to: navigation, search

Steven Chu

Born
February 28, 1948 (1948-02-28) (age 60)
St. Louis, Missouri

Birth name
Steven Chu (朱棣文, Zhū Dìwén)

Spouse
Jean Chu

Alma mater
University of Rochester
University of California, Berkeley

Profession
Scientist
Steven Chu (born February 28, 1948)[1] is an American experimental physicist. He is known for his research in laser cooling and trapping of atoms, which won him the Nobel Prize in Physics in 1997.[1] His current research is concerned primarily with the study of biological systems at the single molecule level. He is currently Professor of Physics and Molecular and Cellular Biology of University of California, Berkeley and the director of the Lawrence Berkeley National Laboratory. As global warming warnings grow more dire, Chu is currently pushing his scientists at Lawrence Berkeley National Laboratory and industry to develop technologies to reduce the impact of climate change by reducing greenhouse gas emissions. Chief in Chu's campaign is an unprecedented research pact reached between UC Berkeley, oil industry giant BP, the Lawrence Berkeley Lab and the University of Illinois, which has drawn considerable controversy. Nearly US$400 million in new lab
space will expand energy-related molecular work centered at Lawrence Berkeley that involves partners around the world; a US$160 million Energy Biosciences Institute helios building is to be funded by BP and subsidized with $70 million of California state funds, house up to 50 BP scientists in a private lab, and will include Chu's separate solar-energy program, but is reportedly on hold due to problems with the approved Environmental Impact Review.[2] According to MSNBC and other media outlets, he is President-elect Barack Obama's choice for Secretary of Energy.[3]
 

 
Chu is an early signatory to Project Steve, an educational campaign supporting the conventional scientific understanding of evolution.[10]

Project Steve

From Wikipedia, the free encyclopedia

Jump to: navigation, search
Project Steve is a list of scientists with the given name Stephen or a variation thereof (e.g., Stephanie, Stefan, Esteban, etc.) who "support evolution". It was originally created by the National Center for Science Education as a "tongue-in-cheek parody" of creationist attempts to collect a list of scientists who "doubt evolution," such as the Answers in Genesis' list of scientists who accept the biblical account of Creation according to Genesis[1] or the Discovery Institute's A Scientific Dissent From Darwinism. The list pokes fun at such endeavors in a "light-hearted" manner to make it clear that, "We did not wish to mislead the public into thinking that scientific issues are decided by who has the longer list of scientists!"[2]
However, at the same time the project is a genuine collection of scientists.. Despite the list's restriction to only scientists with names like "Steve", which in the United States limits the list to roughly 1 percent of the total population,[3] Project Steve is longer and contains many more eminent scientists than any creationist list. In particular, Project Steve contains many more biologists than the creationist lists, since about 2/3 of the Steves are biologists.[4]
The "Steve-o-meter" webpage provides an updated total of scientist "Steves" that have signed the list. The Steve-o-meter registered 987 Steves as of December 9, 2008.[5]
 
raja.elang
 

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3.

[artikel chem-is-try.org] Pembuangan dan Penanganan Bahan Kimia Tump

Posted by: "mr.soetrisno" chemcafe@yahoo.com   mr.soetrisno

Thu Dec 11, 2008 6:04 pm (PST)

Kategori Kimia Lingkungan
Pembuangan dan Penanganan Bahan Kimia Tumpahan di Laboratorium
Oleh Yoky Edy Saputra
Alumni Jurusan Kimia FMIPA Universitas Andalas Padang

Laboratorium yang baik adalah laboratorium yang tidak hanya
memperhatikan masalah ketelitian analisa saja. Akan tetapi
laboratorium yang baik juga harus memperhatikan masalah pembuangan
limbah. Limbah yang dibuang sembarangan, jika masuk ke badan air
tanah dan mengalir ke pemukiman penduduk akan menimbulkan bahaya.
Terutama logam-logam berat. Jika tidak ditangani dengan baik dapat
membahayakan makhluk hidup dan merusak lingkungan.

Pembuangan Limbah

Secara umum, metoda pembuangan limbah laboratorium terbagi atas empat
metoda.

Pertama, pembuangan langsung dari laboratorium. Metoda pembuangan
langsung ini dapat diterapkan untuk bahan-bahan kimia yang dapat
larut dalam air. Bahan-bahan kimia yang dapat larut dala air dibuang
langsung melalui bak pembuangan limbah laboratorium. Untuk bahan
kimia sisa yang mengandung asam atau basa harus dilakukan penetralan,
selanjutnya baru bisa dibuang. Untuk bahan kimia sisa yang mengandung
logam-logam berat dan beracun seperti Pb, Hg, Cd, dan sebagainya,
endapannya harus dipisahkan terlebih dahulu. Kemudian cairannya
dinetralkan dan dibuang.

[selengkapnya] http://www.chem-is-try.org/?sect=fokus&ext=57

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4.

[artikel chem-is-try.org] Cara baru pendeteksian bahan peledak

Posted by: "mr.soetrisno" chemcafe@yahoo.com   mr.soetrisno

Thu Dec 11, 2008 6:04 pm (PST)

Kategori Kimia Analitis
Cara baru pendeteksian bahan peledak
Oleh Chandra Wahyu Purnomo
Dosen Kimia FT Kimia UGM

Dalam upaya untuk 'mencium' bahan peledak berbahan dasar peroksida,
seperti yang digunakan dalam pengeboman di London tahun 2005, para
ilmuwan telah mengembangkan sebuah sensor yang efektif dan murah yang
secara selektif mampu mendeteksi uap hidrogen peroksida (J. Am. Chem.
Soc.). Selain dapat diaplikasikan dalam bidang kontra-terorisme, alat
ini juga bisa digunakan untuk mendeteksi H2O2 pada industri dimana
kontak dengan senyawa ini menjadi isu kesehatan yang serius.

Untuk membuat peledak berbahan peroksida dibutuhkan H2O2 sebagai
bahan awal (precursor), sehingga bom peroksida biasanya masih
mengandung bahan kimia diatas. Sensor peroksida dengan ukuran sebesar
kotak korek api ini ditemukan oleh sebuah tim dari University of
California, San Diego, dipimpin oleh William C. Trogler, Andrew C.
Kummel, dan Ivan K. Schuller, dapat mendeteksi uap H2O2 dalam orde
ppb (parts per billion). Menurut para peneliti, alat yang murah dan
berukuran mini ini merupakan kemajuan baru dari standar pendeteksian
H2O2 yang sekarang masih bergantung pada peralatan yang kompleks dan
mahal.

[selengkapnya] http://www.chem-is-try.org/?sect=artikel&ext=232

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5.

[artikel chem-is-try.org] Pengukuran Tekanan dalam Ukuran Nano

Posted by: "mr.soetrisno" chemcafe@yahoo.com   mr.soetrisno

Thu Dec 11, 2008 6:04 pm (PST)

Kategori Kimia Analisis
Pengukuran Tekanan dalam Ukuran Nano
Oleh Amsal Sihombing

Para peneliti di National Institute of Standards and Technology
(NIST) telah mendemonstrasikan kemampuan mereka untuk mengukur
tegangan tingkat rendah di permukaan seluas hanya 10 nanometer di
permukaan semikonduktor.

Tegangan mekanis di semikonduktor dan peralatan lainnya disebabkan
oleh atom di lapisan kristal yang ditekan atau diregangkan sehingga
bergeser dari posisi semula, sebuah fenomena yang rumit walau tidak
selalu berbahaya. Tekanan pada permukaan dasar dari dioda pemancar
cahaya dan laser dapat mengubah warna yang dihasilkan dan mengurangi
daya tahan peralatan. Di sisi lain, tekanan sengaja diberikan pada
sirkuit mikro canggih karena apabila diaplikasikan secara benar,
proses ini dapat meningkatkan kecepatan transistor tanpa menimbulkan
perubahan pada rancangan peralatan. "Technology tekanan memampukan
industri semikonduktor untuk meningkatkan kemampuan peralatan-
peralatan melebihi dari apa yang diharapkan dari bahan-bahan yang
tersedia saat ini," ujar fisikawan peneliti NIST, Robert
Cook, "sehingga dapat menghindari masalah-masalah dalam hal teknis
dan biaya yang berkaitan dengan menggunakan bahan yang berbeda."

[selengkapnya] http://www.chem-is-try.org/?sect=artikel&ext=233

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