S***n
发帖数: 330 | 1 http://news.yahoo.com/most-extreme-space-discoveries-2012-12084
Astronomical discoveries in 2012 have reshaped what we know about the
universe and pushed some instruments to the very limits of their observing
power.
Scientists discovered a galaxy that harbors an enormous central black hole
17 billion times more massive than the sun. Another research group spotted a
scorching-hot rocky planet in the closest star system to our own. Meanwhile
,the records for most massive galaxy cluster and most di... 阅读全帖 |
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r******g
发帖数: 22 | 2 We are looking for a postdoc with experience in synthetic organic
chemistry or related discipline. Previous experience with handling
radioactive PET or SPET radiopharmaceuticals for preclinical and/or
clinical application would be an advantage, but are not required.
Duties will involve the development, synthesis and evaluation of novel PET
probes labelled with short-lived positron emitting radioisotopes(C-11,F-
18) for molecular imaging.
if you are interested in, please contract with me by email... 阅读全帖 |
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s**e
发帖数: 39 | 3 Last week a recruiter called, saying Merck is looking for Imaging
Specialists for PET (Positron Emission Tomography) study. I have no detailed
information on it, and not sure if "chemistry board" is the right place to
post it. Anyway, anyone interested, may go to their website to take a look. |
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h***o
发帖数: 350 | 4 Interaction of hydrogen with defects in ZnO nanoparticles – studied by
positron annihilation, Raman and photoluminescence spectroscopy
Xudong Xue, Tao Wang, Xudong Jiang, Jing Jiang, Chunxu Pana and
Yichu Wu
CrystEngComm, 2014,16, 1207-1216
DOI: 10.1039/C3CE42202J
http://pubs.rsc.org/en/content/articlelanding/2014/ce/c3ce42202
Thank you very much. |
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r******g
发帖数: 22 | 5 We are looking for a postdoc with experience in radiochemistry, synthetic
organic chemistry or related discipline. Previous experience with handling
radioactive PET or SPET radiopharmaceuticals for preclinical and/or
clinical application would be an advantage, candidate with cell biology
background preferred. Duties will involve the development, synthesis and
evaluation of novel PET probes labelled with short-lived positron emitting
radioisotopes(C-11,F- 18) for molecular imaging.
if you are int... 阅读全帖 |
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r******g
发帖数: 22 | 6
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标?? 题: Post-doctoral Radiochemist position open in Moffitt Cancer
We are looking for a postdoc with experience in radiochemistry, synthetic
organic chemistry or related discipline. Previous experience with handling
radioactive PET or SPET radiopharmaceuticals for preclinical and/or clinical
application would be an advantage, but not required. Duties will
involve the development, synthesis and
evaluation of novel PET probes... 阅读全帖 |
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l*******g
发帖数: 82 | 7 PALS (Positron annihilation) |
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l*******8
发帖数: 290 | 8
25) In a patient with a movement disorder , positron emission tomography (
PET), using a radioactive ligand for the dopamine 1 (D-1) receptor, shows a
marked reduction in the structure indicated by the arrow in the MRI of the
normal head. Which of the following is the source of the innervation of this
structure by dopamine-containing axons?
A) Globus pallidus
B) Motor cortex
C) Motor thalamus
D) Striatum
E) Substatia nigra
The arrow in the MRI points to the Caudate Nucleus. |
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yf
发帖数: 272 | 9 http://jop.ascopubs.org/content/early/2013/03/26/JOP.2012.00081
Perspective
Practicing Western Oncology in Shanghai, China: One
Group’s Experience
By David H. Garfield, MD, Harold Brenner, MD, FRCR (Lond), and Lucy Lu, RN
ProMed Cancer Centers–Shanghai, Shanghai, People’s Republic of China
In October 2011, we—David H. Garfield, MD, medical oncologist,
United States; Harold Jacob Brenner, MD, FRCR,
radiation oncologist, Israel; and Lucy Lu, oncology nurse,
Shanghai, China—were part of a group tha... 阅读全帖 |
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e******g
发帖数: 75 | 10 这个是proton-antiproton的，没有positron的，
不知道他们什麽时候才publish他们的结果，
总不能让人一直用偷拍的吧？ |
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m********r
发帖数: 811 | 12 *
SLAC, 1968
o Discovery of quarks in electron-proton scattering
*
SLAC and Brookhaven, 1974
o Discovery of the charm quark in electron-positron annihilation
*
Fermilab, 1977
o Discovery of the bottom quark in proton collisions
*
Fermilab, 1995
o Discovery of the top quark in proton-antiproton annihiliation |
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c****e
发帖数: 2097 | 13 sure, quarks were first fictional and then real. don't you read history?
plus, a theorist is never limited to study what experimentalists have done.
and don't tell me experimentalists found positron before Dirac proved its
existence by an EQUATION.
calling other people whatever names isn't going to help your physics.
(Let me add my favorite for this, didn't Einstein predict the cosmological constant 80 years before it's
observed?)
it |
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s*****V
发帖数: 21731 | 14 下一代高能正负电子对撞机：现状与对策
——香山科学会议第464次学术讨论会综述
粒子物理学（或称高能物理学）是研究“物质、能量、空间、时间”等自然界最基本问
题的学科。粒子物理标准模型的建立使得人类对构成物质世界的基本组成单元和相互作
用的认识达到了空前的高度，同时也有很多问题亟待解答。为了深入研究电弱对称性自
发破缺机制和质量起源等基本问题，探索超出标准模型的新物理现象，理解宇宙观测中
暗物质和暗能量的本质，在大型强子对撞机（LHC）成功运行后，人类还需要建造下一
代正负电子对撞机，通过两种对撞机上探测结果的互补来发现和确认新基本粒子及其性
质、从而进一步揭示新物理定律。
2012年7月4日，欧洲核子研究中心（CERN）宣布在LHC的ATLAS和CMS两个实验都观测到
了一个类Higgs玻色子的新粒子，质量在125GeV附近。这个粒子的发现对下一代正负电
子对撞机的设计和建造具有关键意义。利用质心系能量250GeV附近的正负电子对撞大量
产生Higgs粒子从而精确测量其性质是下一代高能正负电子对撞机主要的科学目标之一
。我国科学界和高能物理界一直在关注LHC第一阶段运行后的高能量前沿... 阅读全帖 |
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L***6
发帖数: 8307 | 15 18号才发表了，说基本可以排除脉冲星之类的天文现象，过量positrons来自于各个方
向而非某一确定方向，数据分析的工作不会拖太久吧 |
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s*****V
发帖数: 21731 | 16 【国家科学评论】NSR访谈｜王贻芳：从中微子研究看中国高能物理发展
2016-08-24|文章来源：NSR |浏览次数： |【大 中 小】
2012年3月8日，中国科学院高能物理研究所所长王贻芳代表大亚湾中微子研究团队
宣布，发现中微子第三种振荡模式，被称为“中微子研究道路上的里程碑”。然而王贻
芳和他的团队显然并不止步于此：正在建设的江门中微子实验基地将自主研制更大的探
测器并预计于2020年建成开始运行，届时中微子的质量顺序有望在实验中测出，成为中
微子研究的下一个重大突破。
实际上，几十年来包括美国、欧洲、日本、中国，都在试图寻找中微子并弄清它精
灵古怪的“脾气”。科学家相信，中微子的深入研究将揭示宇宙演化的重大问题，比如
为什么我们的宇宙只大部分是物质而不是反物质等。
这并不容易。虽然时时刻刻都有中微子像无数的流星一样划过天际，穿越我们的地
球和身体，但它们非常轻，而且调皮，难以抓住。中微子还有三种“味道”，即电子中
微子νe，缪中微子νμ，陶中微子ντ，要搞清楚“三种味道如何混合”，每种中微
子的绝对质量多少，以及更多的相关问题，难度可想而知。
然而在王贻芳看来，中微子研究虽... 阅读全帖 |
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c**t
发帖数: 316 | 17 自闭症谱系障碍的临床研究新进展（DSM-5新标准）
邓明昱 劳世艳
国际华人医学家心理学家联合会，美国纽约
【摘要】自闭症谱系障碍(ASD)和自闭症为一组大脑发育障碍的复杂疾病。其特征是在
不同程度上的社交互动障碍、语言和非语言的沟通有问题，以及重复的动作。
美国精神病学会在2013年5月出版了《精神疾病诊断与统计手册》第5版（DSM-5）。在
DSM-5诊断手册中，所有的自闭症障碍合并为一个诊断：自闭症谱系障碍（ASD）。在此
之前，它们被认为是不同的亚型，包括自闭症、儿童期瓦解性障碍、阿斯伯格综合征、
雷特氏症和待分类的广泛性发育障碍。
自闭症的一些表现似乎呈现在非常早期的大脑发育时。然而，自闭症的最明显的标志和
自闭症的症状往往出现在2-3岁。
近年来，对自闭症谱系障碍（ASD）的临床研究成为精神病学、心身医学和临床心理学
的热点。根据DSM-5的标准和新的临床研究成果，本文对自闭症谱系障碍（ASD）的病因
和发病机... 阅读全帖 |
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l**i
发帖数: 5 | 18 you assume that photon 1 and 2 are symmetric
about the incoming axis of positron which is not necessary.
why L2=L1?if so,they have the same
magnitude of 3-momentum and energy
This is of course one solution.
But using your equation without L1=L2 plus the energy
conseration,I think you may get the desired result. |
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t**********e
发帖数: 1 | 19 somebody use Materials Studio
or Crystal Studio
【 以下文字转载自 Software 讨论区,原文如下 】
发信人: chenzq (positron), 信区: Software
标 题: 请问有没有画三维晶体结构的软件？
发信站: The unknown SPACE (Sun Nov 3 08:41:58 2002) WWW-POST
比如要画某半导体的三维晶体结构（闪锌矿结构，纤锌矿结构等等）。
多谢！ |
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c********6
发帖数: 658 | 20 Calculate the total energy and velocity of a 2 MeV positron and a 2 MeV
alpha. Indicate whether either of these particles is relativistic. |
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y********4
发帖数: 33 | 21 Luminescent nanocrystals (replacing organic dyes) for bioimaging.
Bioconjuction of luminescent nanocrystals for diseases detection.
Nanocrystals based scintillators for medical imaging (X-ray radiology,
Computed Tomography, Positron Emission Tomography, etc.) |
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A*******s
发帖数: 9638 | 22 Recommendations on Cell Phone Use and Cancer Risk（ZZ)
Allison Gandey
Information from Industry
Think what it could it cost you not to adopt an EHR system
For office-based physician not adopting an electronic health records(EHR)
system by 2015, Medicare payments are planned to be reduced.
Calculate impact June 22, 2011 — The evidence is limited when it comes to
cell phones and cancer risk, but specialists say common-sense measures can
come into play until the science catches up with technology.
T... 阅读全帖 |
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