Tuesday, June 30, 2015

幾何光學 經典光學 物體和像之間的幾何相似關係 絕大部分星系在天空投影都有規則的幾何形狀

[PDF]一簡介 - 國立交通大學機構典藏
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由 王瑞仁 著作 - ‎2005
絕大部分星系在天空投影都有規則的幾何形狀,而這些規則形狀又可分為兩種基. 本類型:形狀近乎圓 .... 這個定義與某些書和一些電腦程式的內定函數(Ex:MATLAB Mathematica)寫得. 不一樣,但為了 ..... [14] “觀測天文物理學" 孫維新,胡景耀譯. 34 ...

 

觀測天文物理學: - 第 197 頁 - Google 圖書結果

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François Lebrun, ‎François Mignard, ‎胡景耀 - 2004 - ‎Astronomical instruments
這些装置將過去在可見光或紅外線的微米尺度的經典光學概念,過渡到了奈米尺度。】 4 . 3 . 6y -射線望遠鏡( >. 197 〔― "望遠鏡和成像 0. 天文台(衛星)能量( ^ V )離光軸 ...
 
 
幾何光學
sparc.nfu.edu.tw/~disteach/檔案/.../工程光學/幾合光學.pps
廿世紀五十年代以來,人們把通訊理論跟光學結合起來,更新了經典光學的 ... 並且在波段上它包含了極短波長的γ射線,X射線、紫外線、可見光、紅外線、遠紅外線。
 
 

觀測天文物理學: - 第 138 頁 - Google 圖書結果

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François Lebrun, ‎François Mignard, ‎胡景耀 - 2004 - ‎Astronomical instruments
畸變( Distortion ) ,它破壞了物體和像之間的幾何相似關係,但仍然維持了物體的點和像的 ... 一個正確的選擇妥協的步驟是:首先選擇鏡面的幾何形狀(較便宜的球面,或非 ...

tradesize investors trying to route their trades through Wall Street have had to break up their trades to accommodate smaller balance sheets.

 investors trying to route their trades through Wall Street have had to break up their trades to accommodate smaller balance sheets.
https://marketwatch.creatavist.com/story/7571

Mile wide, inch deep

Bond market liquidity dries up

Mile wide, inch deep
Bond market liquidity dries up

Brownian movement 涨落与耗散过程

生物仿生原理与应用 - 厦门大学生物仿生与软物质研究院
rwz.xmu.edu.cn/a/yanjiulingyu/
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结冰必须由水中的水纳米级颗粒的引发,抗抗冻蛋白抗冻机理是由于抗冻蛋白对纳米颗粒界面阻隔结冻引起的。 ..... (C) 在形成稳定核之前,成核团蔟的涨落。 .... 生物化学中基本的质量作用定律和细致平衡定理都不能适用于局域钙信号的模型研究中。

3.2.2 涨落—耗散定理
方程(3.31)及(3.37)中的“扩散系数”
/ B D  k T  , (3.38)
其中 是表征系统微观分子的“涨落”引起的粘滞(或者摩擦),即Brownian
粒子的扩散过程是由于液体分子的涨落过程引起的阻尼过程。而阻尼本质上是
耗散过程。关系式(3.38)将涨落与耗散过程联系在一起,所以被称为“涨落—
耗散定理”。


多数情况下(除热等离子体外),等离子体中的电子温度和离子温度相差很大,整体来说是远离平衡的体系。



一般认为,粒子间的相互碰撞是输运现象的微观过程。但是在等离子体中,
由于长程的电磁相互作用及大量运动模式的存在,波对带电粒子的散射成为输
运过程的重要原因——在很多情况下,甚至是主要原因。因此导致“反常”的
输运、耗散。这也是非平衡态等离子体物理所要研究的重点之一。


2.1 Boltzmann 方程
基于“气体是由大量相互作用的粒子构成的”这一模型,非平衡态统计物理
学的先驱Ludwig Boltzmann在19世纪下半叶发展起来了描述微观粒子在速度
空间的分布函数满足的方程:Boltzmann 方程。
这个方程的推导见于统计物理的教科书。我们在这里直接给出最后的结果:
速度分布函数 f (x, v,t)满足的方程
( , , )
c
f t f
t m t


                
v F x v
x v
, (2.01a)
其中的 Boltzmann 碰撞项
1 1 1 ( )
c
f d d f f f f
t


  v     , (2.01b)
这里的 d 是碰撞立体角元,  是碰撞散射截面。这就是著名的Boltzmann 积
分—微分方程。在推导这个方程时,我们假设了:1)二体碰撞(忽略了三体及
多体相互作用与关联,Boltzmann 用的是“稀薄气体”);2)短程相互作用——
Boltzmann 用的是“刚球模型”; 3)“分子混沌性”——碰撞过程中两个粒子
的分布是是相互独立的,即碰撞过程只与双粒子的分布12 1 2 12 f  f f G 中的 1 2 f f
有关,而与粒子间的关联无关。


2.2 H 定理与熵
Boltzmann 方程的最重要的贡献是通过H 定理证明了热力学第二定律——
发展的时间箭头。而热力学第二定律不仅在物理学和自然科学中,而且在社会
科学领域里也有重要应用。我们下面就来证明H 定理。
Boltzmann 在1872 年引进这样一个H 函数:
H   dxdv f (x, v,t) ln f (x, v,t) 。 (2.02)
将这个 H 函数对时间求全微分,并利用Boltzmann 方程,并假设积分域的边界
时绝热的,我们得到下面的关系式:
1 1 1 1 1
1 ( )(ln ln )
4
dH d d d d f f f f f f f f
dt
   x v v         。 (2-03)
因为被积函数的两个因子 1 1 ( f f   f f )和 1 1 (ln f f   ln f f )的符号总是相同的,所以
总有
dH 0
dt
 。 (2-04)
这里等号只有在 1 1 f f   f f 的情况下成立。
这就是著名的 H 定理:在孤立体系中,分布函数的辩护总是使得H 函数减
小,除非体系已经达到这样一种平衡状态——分子间的碰撞不再引起分布函数
的变化。
从 H 定理可以知道,H 函数具有描述系统演化时间箭头的性质,即具有“熵”
的性质。通过与热力学熵的比较,Boltzmann 得到在第一性原理意义上的“熵”
的定义:


2.3 细致平衡原理
H 定理和热力学第二定律的微观第一性原理证明引起物理学界的争论:既然
Boltzmann 方程具有宏观不可逆性质,那么作为其出发点的微观物理规律的可
逆性呢?
细致平衡原理告诉我们 Boltzmann 方程的微观可逆性:
1 1 f f   f f 。 (2.07)
也就是说,如果 dt 时间段的元碰撞引起的分布函数变化
( )
1 1
 f c  f f ddxdtdvdv
与相同时段反元碰撞引起的分布函数变化
( )
1 1
 f i  f f ddxdtdvdv
相等,则我们说体系处于“细致平衡”状态。而这个状态就是平衡态。即体系
达到平衡状态的充分必要条件是达到“细致平衡”——这就是细致平衡原理。



[PDF]非平衡态统计物理导论 - 北京大学物理学院
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倒易关系是“细致平衡定理”的“宏观”体现——在线性近似下,非平衡态体 ... 将微观物理量的涨落与宏观的耗散联系起来,是非平衡态统计物理的基石之一。 在Einstein ...
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  • 线性非平衡局域系统涨落的化学反应进展度变量与细致平衡原理

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    推导并给出了线性非平衡局域系统的内变量(化学反应进展度变量)涨落的均方差公式,给出了稳定性条件。讨论了相应的均方差、细致平衡方程以及弛豫时间等热物理 ...
  • [PDF]非平衡定态化学反应体系对细致平衡偏离的不可逆性之随机 ...

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    由 赵南蓉 著作 - ‎相關文章
    作为偏离细致平衡不可逆性的合适度量, 此泛函量的零值标志着细致平衡. ... 关键词Fokker2P lanck 方程; 随机熵产生; 细致平衡; 非Poisson 涨落; 随机力及随机流.
  • [PDF]第八期 - 中国流变学学会-- Chinese Society of Rheology

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    随机主方程的广义积分涨落定理及时间反演. ...... 反演是涨落关系一个非. 常重要的基础概念。 关键词:涨落关系;时间反演;随机离散主方程系统;熵产生;细致平衡条件 ...
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    下册包括量子统计、玻尔兹曼统计、费米统计和玻色统计,然后给出经典统计;系统理论对物理类学生深入学习而用,并介绍非平衡态的玻尔兹曼输运方程、涨落理论和 ...
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    本书是《理论物理学教程》的第十卷,全面详细地论述了统计非平衡系统中过程的 ... 第一章气体动理学理论1 分布函数2 细致平衡原理3 玻尔兹曼动理方程4 H定理5 向 ...
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    2014年12月20日 - 为了更好地为患者提供全面细致的医疗服务和治疗信息,除直接到医院进行 ... 十位专家、教授,攻关联合课题,在“MAX脑涨落的检测技术”和“MAX脑平衡 ... (1)精确检测是关键:采用“MAX脑涨落检测仪”及“DNR多导脑神经检测系统” ...
  • 生物仿生原理与应用 - 厦门大学生物仿生与软物质研究院

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    结冰必须由水中的水纳米级颗粒的引发,抗抗冻蛋白抗冻机理是由于抗冻蛋白对纳米颗粒界面阻隔结冻引起的。 ..... (C) 在形成稳定核之前,成核团蔟的涨落。 .... 生物化学中基本的质量作用定律和细致平衡定理都不能适用于局域钙信号的模型研究中。
  • [PDF]基于内变量热力学的黏弹性本构方程及其基本性质研究 - 中国 ...

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  • A new reality
    Dan Fuss likes to describe the structure of the corporate bond market as resembling an ice cream sandwich: bonds change hands between the two crispy wafers on either side, but there’s a fluffy layer in between that facilitates each transaction.
    “It’s a good sandwich if there’s a whole bunch of ice cream on the inside,” says Fuss, a bond market veteran who runs the $21.9 billion Loomis Sayles Bond Fund. But in recent years, that creamy inner layer, commonly known by the less appetizing title of “dealer,” has been melting.
    Dealers were once powerful arms of Wall Street’s biggest investment banks, such as Merrill Lynch, J.P. Morgan and Lehman Bros.  They used their large trading desks to make markets for investors to buy and sell securities. But the shifting roles of these large banks since the financial crisis, often pinned on financial regulations like the Volcker Rule, has caused a steep drop in the volume of debt securities  these investment banks hold.
    The cushion protecting fixed-income investors from market shocks, particularly in the $6.6 trillion corporate bond market, is melting, which is creating a new form of risk when it comes to buying these securities. In response, investors are reevaluating how they hold bonds sold by companies from Apple Inc. to Ford Motor Co. to DreamWorks Animation, as well as reshaping how they interact in the secondary trading market. The changes have served as a key factor eroding the traditional conviction that the bond market shields investors from risk.
    Liquidity drought

    Liquidity drought

    Created by Terrence Horan
    The financial crisis forced the surviving Wall Street banks to reduce risk in a hurry. Many have downgraded their roles as market-makers for corporate bonds, taking fewer bonds onto their books for future sale. Market participants blame the constricting regulatory forces of capital requirements and the post-crisis Volcker Rule. Regulators have pinned the blame back on the banks, which raced to shed less-liquid assets even before regulations were enacted.
    At the same time, a surge in new bond sales has increased the size of the market even as dealers, the key facilitator to helping those bonds change hands in the secondary market, have become less willing to handle them. The result is a bond market which is flush with new securities but hobbled when it comes to pricing and trading these securities after the initial sale. As liquidity evaporated in the wake of the financial crisis, it has adjusted the way large asset managers hold and trade bonds, which then impacts the retail investors who put money into mutual and exchange-traded funds (read one institutional investor's story). Here's what's at stake:
    • Buyers are paying a premium to own liquid bonds
    • Investors who need to sell bonds in a hurry are finding less stable prices
    • A chaotic exit from the bond market could cause yields to spike and portfolio values to drop
    These market shifts are set against the backdrop of a widespread fear that investors will leave the bond markets en masse as interest rates rise. Concerns about low bond-market liquidity mounted this summer as investors ditched bonds in what bond guru Jeffrey Gundlach has called a liquidation cycle (see what investors were saying at the time). The 10-year Treasury note yield spiked  by more than 1.3 percentage points over the summer, briefly touching 3%, on concerns about a Federal Reserve wind down of its bond-buying stimulus program, which was announced last week. The benchmark note traded near 3% on Dec. 27.  
    The summer bond selloff propelled the corporate bond market to a brief correction characterized by wild movements in prices, though investment-grade prices rapidly recovered. If an event in the credit or rates market provokes another panicked rush to the exits, without the help of dealers as a cushion, it could strain the market and further exacerbate price swings. The fear is that what might have been a moderate selloff could cascade into a rout, sending costs on mortgages and corporate debt sky high. 
    “I think people have gotten too comfortable, nay complacent, with how this exit process works,” says Tom Murphy, sector leader for investment grade credit at Columbia Management. Investors have piled money into corporate bonds in the years since the financial crisis, but that could translate to chaos if sentiment reverses all at once.
    But there’s always a silver lining, and the liquidity struggles facing the market may finally be heralding a broader discussion about whether and how the bond market can better meet the needs of investors. Buyers of debt would ideally like to be able to trade large blocks of bonds quickly and cheaply. The holy grail for many investors is something akin to the way equities trade: in high volumes with tight differentials between the price of a buyer and seller.
    Fragmentation
    "The market is a mile wide and an inch deep.” — Will Rhode, director of fixed income, TABB Group.
    That’s a difficult proposition, if not impossible. The corporate bond market is by nature fragmentary: while a company has one ticker symbol on a stock exchange, that same firm can have dozens of outstanding bonds, each with their own peculiarities. The wide range of differentiation allows companies easier capital markets access and it provides opportunities for investors who can parse the relative value of different issuances. It’s also at the heart of what makes it so hard to ensure a liquid market.
    “The market is a mile wide and an inch deep,” says Will Rhode, director of fixed income at research firm TABB Group.
    With liquidity making trading more difficult in the corporate bond market, there’s a growing recognition that a solution is needed, and that it may have to go beyond simply adjusting the point of interaction between dealers and investors. The whole market may need to evolve -- from standardizing the way bonds are issued to funneling the market toward a new trading structure.
    The issue has long been top-of-mind among market insiders, but isn’t as widely discussed among the vast pool of investors who buy into the bond market for its perceived security. MarketWatch interviewed a range of corporate bond market participants in recent months to assess the origins of this shift, the reconsideration of trading strategies that it’s spurred among bond investors, and a possible path towards a better functioning bond market.
    The dealer folds
    Before the financial crisis, dealer market-making held a powerful place in the nation’s biggest investment banks. The fresh-out-of-college traders that shuffled in and out of Manhattan bank buildings each day handled the banks' inventories of bonds worth hundreds of millions of dollars, which they used as starting capital to make their own trades, says Lawrence McDonald, a former Lehman Bros. corporate bond trader. The holdings, which were used to make markets for each type of corporate security, would fit into two categories, or books.
    “The front book is the facilitation book. That’s the book for client liquidity. The back book is your prop position. That book was responsible for a lot of profits on the Street in 2007, and that today pretty much doesn’t exist,” said McDonald, who authored A Colossal Failure of Common Sense, a bestseller about the bank's demise.
    That system crumbled in the years after the financial crisis. The facilitation books shrank in size while the proprietary trading books became virtually non-existent. Dealer balance sheet sizes fell to a fraction of what they once were.
    The smaller amount that dealers hold on their books means they can’t unconditionally buy bonds that investors are trying to sell, especially in large blocks. But there’s another issue at play: the low interest-rate environment that characterized much of the post-crisis economy has brought many new issuers into the market. New corporate bond sales have surged as issuers rushed to take advantage of still attractive rates and investors sought the relatively higher income of corporate debt.
    The combination of smaller holdings by dealers and a surge in the amount of outstanding corporate debt suggests that there’s more inventory to change hands with fewer institutions willing to facilitate those transactions. Whereas dealers once held about 4% of all outstanding corporate debt on their balance sheets, they now hold closer to 0.5%, according to Oliver Randall, a professor of finance at Emory University, who has done research on corporate bond market liquidity (see more about his research).
    Even as most sides recognize there’s a lack of liquidity in the market, there’s a fundamental disagreement about what caused it. Market participants are quick to point to new regulations that limit proprietary trading by dealers and increase the amount of reserves required to be held by banks. In that sense, the liquidity drought has provided ammunition for critics who believe financial reform has been destructive to the markets. But government officials are equally quick to suggest that banks have become less tolerant of risk.
    The Volcker Rule was passed as part of the Dodd-Frank financial reform bill in 2010. It banned banks from trading securities with their own money, or proprietary trading. The rule has become one of the more controversial pieces of the regulatory regime, even though the final regulations were only laid out in early December. Nonetheless, banks had already wound down their proprietary trading operations in anticipation of the rule taking effect, and market participants say the lack of clarity about how much of dealers' standard trading activity would be considered proprietary further cut into their market-making ability ahead of the release of the final regulations (read NYSE CEO Niederhauer's take on the Volcker Rule and bond markets) .
    The collapse of banking giant Lehman Brothers in 2008, whose former headquarters is pictured above, helped kick off the financial crisis, triggering changes still being felt (Photo: Bloomberg).
    The other focal point of regulatory reform is the Basel III capital regulations, which force banks to hold higher levels of reserves as a buffer against the type of bank leverage that expedited Lehman's fall into bankruptcy and kicked off the financial crisis. It’s making the dealer arms of banks less able to deploy capital to make markets in corporate bonds, market-makers told Treasury officials .
    Lawmakers have cited broader shifts in trading practices  as possible reasons for the decline in market-making ability.
    New York Federal Reserve economists did research on the summer 2013 bond selloff, looking at how market-making ability changed as investors left the bond market as a whole. They concluded that even though dealers stepped back from their roles as intermediaries during the selloff, the dealers for whom there was more regulatory breathing room to take on risk actually took less risk. That indicated market-making ability was driven less by capacity limitations from regulations, and more by self-imposed limits on risk.
    Finger pointing aside -- and excluding other reasons, such as hesitancy of trading outside the benchmarks set by pricing-disclosure platform Trace --  there tends to be a widespread recognition that the historic ability to take on risk has evaporated, forcing a shift in the way investors trade bonds. The bottom line, says Fuss of Loomis Sayles, is that it’s, “rules, both written and internal, as to the risk [dealers] can take carrying inventory.”
    Investors play their hand
    The total amount of trades in the high-grade corporate bond market has actually increased in the last five years, which seemingly contradicts the idea that liquidity is drying up. But alongside that rise, trade sizes have shrunk markedly, indicating that investors trying to route their trades through Wall Street have had to break up their trades to accommodate smaller balance sheets.
    This change has given small firms an unusual advantage on Wall Street, where mammoth investors often have an edge because of their size. 
    Trade size
    “I haven’t seen any problems with liquidity, but the size I trade in isn’t really a problem.” — Chris Keith, Adviser Investments
    Chris Keith manages portfolios for individuals at Newton, Mass.-based Adviser Investments, which has roughly $2 billion in assets under management. When he’s in the market, he’s trading in smaller quantities than the major asset managers, which means he doesn’t risk overwhelming the Street with his inventory.
    “I haven’t seen any problems with liquidity, but the size I trade in isn’t really a problem,” Keith said. “I think it’s when you have bigger trades, you get a concern there.”
    For larger investors, another trick to circumvent liquidity issues is to deal in more liquid synthetic securities such as derivatives contracts, which can be used to bet on the credit quality of a company without having to deal with the same liquidity problems of the bond market.
    Douglas Peebles, chief investment officer and head of AllianceBernstein fixed income, says he finds himself using more derivatives. These allow buyers to invest in the same underlying assets, but in many cases, they can be assured of more liquidity that the actual bond. Bond guru Bill Gross, who runs the world’s biggest bond fund, also concedes that he has begun using derivatives in his Pimco Total Return Fund.
    Peebles has also shifted the way his trading desk works. His traders now have experience in independently pricing the debt securities they’re looking to buy and sell, reducing reliance on dealers to provide fair prices for trades.
    “Before, you could go into the marketplace, and go ask five guys for the price of a bond, and get five similar prices. Now, we need to know the price,” he said.
    Assessing the inherent value of a bond also includes knowing the price premium of liquidity. There's a growing gap between which bonds are liquid and which ones aren't, so the more liquid a bond is the higher the price tends to be, and the lower the yield.
    A November Goldman Sachs report estimates that the premium that a bond pays over Treasurys is roughly 10% larger when a bond is illiquid, a large increase over pre-crisis levels. Shown the other way, liquid bonds on average yielded about 0.1 percentage points less  between 2011 and mid-2013, according to BlackRock. That may not seem like much, but in a low-rate environment, every basis point counts over the life of a bond.
    As investors adjust to this environment, innovation is beginning to take shape.  Electronic-trading networks, which provide a more efficient connection between investors and dealers as well as other investors, have been slowly catching on (Read about MarketAxess as a case study). Such platforms run the gamut: some simply connect an investor to a dealer in a computerized equivalent of a phone call, while some open up the possibility of trading between all investors and all dealers at the same time.
    Market participants have also been gravitating toward a variety of new market structures that redefine how corporate bonds trade (Rhode, of Tabb Group, puts these new structures into three groups).
    The bottom line is that bond investors are getting used to the idea that liquidity has dried up. And here’s where the rubber meets the road. If all is calm in the bond market, with dependable and reliable flows into and out of bond funds, investors can methodically work around the issue. In that sense, a robust secondary market is simply a luxury.
    But if there’s a mass exodus from the market, a functioning mechanism to trade bonds is necessary. Retail investors pulled money from corporate bond funds over the summer of 2013, forcing the sale of underlying assets, as the Federal Reserve contemplated scaling back its bond-buying program. When big bond investors had to sell into a down market, inconsistencies in the pricing became more exaggerated (See how investors fled bond funds this summer ).
    Fears of a shift in monetary policy by the Federal Reserve, pictured above, pushed Treasury yields sharply higher over the summer, leading to a brief selloff in the corporate bond market. (Photo: Bloomberg)
    The 10-year Treasury note, a benchmark often used to price sectors of the corporate bond market, recently traded near its highest level in over two years, though the corporate bond market recovered quickly from the summer selloff. If that sentiment again reverses -- a subject of much discussion due to shifts in monetary policy as well as any number of other market factors (see: the Great Rotation debate) -- a healthy trading mechanism is a necessity.
    A solution may prove difficult because the bond market itself is fragmented, with issuers of many different sizes each selling specific types of debt. That was the case long before the financial crisis, but in the end the whole market may need to evolve, says Richard Prager, head of trading and liquidity strategies at BlackRock. The firm has been testing an internal bond trading platform (Read about BlackRock's Aladdin bond-trading platform). If trading in the bond market is to become like trading in the stock market, the adaptation has to begin with issuers, who could streamline the way they issue debt, with all of the other groups of market participants pitching in.
    “This is a journey,” says Prager. “This is not an overnight market structure shift. I don’t know if this a three-year, five-year, or decade-long journey. In the equity market it took a decade to change.”
    PHOTO CREDITS FOR CHAPTER COVER IMAGES: Top: Getty images; Middle: Library of Congress; Bottom: Bloomberg

    分子动力学 应用多巴胺-血清蛋白作为修饰分子吸附并包裹抗肿瘤药物阿霉素(DOX)于空心氧化铁纳米颗粒中,制备出一种新型的载药

    空心氧化铁纳米颗粒可做为多药耐药性载体-观察-生物探索

    www.biodiscover.com/news/hot/research/103159.html
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    2012年12月10日 - 本项研究中,我们应用多巴胺-血清蛋白作为修饰分子吸附并包裹抗肿瘤药物阿霉素(DOX)于空心氧化铁纳米颗粒中,制备出一种新型的载药 ...
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    轉為繁體網頁
    本项研究中,我们应用多巴胺-血清蛋白作为修饰分子吸附并包裹抗肿瘤药物阿霉素(DOX)于空心氧化铁纳米颗粒中,制备出一种新型的载药模型(HIONPs-DOX)。
  • 纳米技术与肿瘤诊疗 - 士捷医疗设备(武汉)有限公司

    medvisionus.com/html/hangyezixun/68.html - 轉為繁體網頁
    2014年10月15日 - 一项发表在JAMA NEUROLOGY上的研究利用多巴胺-血清蛋白作为修饰分子吸附并包裹抗肿瘤药物阿霉素(DOX)于空心氧化铁纳米颗粒中,制备出 

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    科学网—很不错的分子动力学模拟论坛- 王子璐的博文

    blog.sciencenet.cn/blog-29043-33038.html
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    2008年7月23日 - [18][游客]zhongming26 2010-6-10 08:49: 您好,我是制药工程的PH. ... 我做高性能计算,我也希望能加入到这个论坛,学习一些分子动力学具体 ...
  • 计算化学(分子动力学)PhD学生,career path求建议! - 未名空间(mitbbs ...

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  • 维生素制药废水的分子动力学结构及其处理,水污染论文_学术堂

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    2014年8月25日 - 本文从制药废水水合结构分析的角度出发,分析制药废水的分子动力学结构,采用合成流变方法进行处理,为维生素制药废水处理工艺提供了新的 ...
  • 第二章分子动力学模拟及其微观结构表征方法 - Academia.edu

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    分子动力学模拟作为一种确定性计算方法为实验中无法观察到的纳米尺度的微观 ... 分子动力学方法得到了长足的发展,己成为物理学、化学、材料科学、生物学与制药 ...
  • 5 分子动力学方法与计算机模拟_百度文库

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    2014年4月1日 - 1986 年至今分子动力学方法得到了长足的发展,已经成为物理学、化学、材料科学、生物学与制药研究必不可少的工具 分子动力学的基本思想经典 ...
  • 我设计的《分子模拟入门》课程教学大纲—— 欢迎大家批评指正 ...

    beijing51.emuch.net/html/201403/7171140.html
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    2014年3月25日 - 这本黑宝书虽然对分子动力学和Monte Carlo的介绍方面很基础,但是上来 ... 通过文献学习,了解分子模拟在化学、化工、生物、材料科学、制药、物理 ...
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    www.cloudscientific.com/Detail/Service/10.html
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    康昱盛科技是国内第一家致力于为生物制药领域提供分子动力学模拟服务的专业信息科学解决方案公司。​我们提供分子动力学模拟服务的应用科学家均为来自海 ...
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    WECOMPUT科技专为生物制药领域提供分子动力学模拟服务,是国内最早提供专业分子动力学模拟服务的供应商之一。服务内容包括分子动力学模拟(Molecular ...
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    药剂学中的分子动力学模拟,分子动力学;;环糊精包合物;;阳离子脂质体;;含脂肪酸甘油酯的体系;; ... 介绍了研究药剂学的新方法——分子动力学的基本原理及常用软件,及近来用其研究环糊精包合物、 ... 主办:上海医药工业研究院;中国化学制药工业协会

  •  
    Before the financial crisis, dealer market-making held a powerful place in the nation’s biggest investment banks. The fresh-out-of-college traders that shuffled in and out of Manhattan bank buildings each day handled the banks' inventories of bonds worth hundreds of millions of dollars, which they used as starting capital to make their own trades, says Lawrence McDonald, a former Lehman Bros. corporate bond trader. The holdings, which were used to make markets for each type of corporate security, would fit into two categories, or books.
    “The front book is the facilitation book. That’s the book for client liquidity. The back book is your prop position. That book was responsible for a lot of profits on the Street in 2007, and that today pretty much doesn’t exist,” said McDonald, who authored A Colossal Failure of Common Sense, a bestseller about the bank's demise.
    That system crumbled in the years after the financial crisis. The facilitation books shrank in size while the proprietary trading books became virtually non-existent. Dealer balance sheet sizes fell to a fraction of what they once were.
    The smaller amount that dealers hold on their books means they can’t unconditionally buy bonds that investors are trying to sell, especially in large blocks

     
    近紅外線影像技術- 維基百科,自由的百科全書 - Wikipedia
    https://zh.wikipedia.org/zh-hk/近紅外線影像技術
    ... 的光有不同的感覺力,經過實驗,視覺最敏感的波長在550nm前後,屬於黃綠色光。 ..... 直到1873年,德國的H. W. Vogel研究太陽光光譜特性時,偶然發現在鹵化銀 ...
  • [PDF]光度單位 - 農業試驗所機構典藏系統

    ir.tari.gov.tw:8080/bitstream/345210000/2995/1/journal_jts_85_09.pdf
    由 姚銘輝 著作 - ‎2011
    太陽光光譜由280nm. 紫外線至4000nm之紅外光皆涵蓋,但一. 般量測範圍 ... 550nm(綠光)最高(圖一),而白天. 太陽光連續拍攝結果,在清晨藍光及傍. 晚紅光有較高 ...
  • [PDF]2011ICEICEW0151886

    www.wisinfo.com.tw/paper/2011/2011ICEICEW0151886.pdf
    由 WYL Hsieh 著作 - ‎相關文章
    由於波長550nm太陽光光譜中為太陽光強度的波段,故. 將其也納入分析的波段。 將四種波長分別做角度對反射率的影響,經由FilmStar. 軟體的模擬,並將曲線做 ...
  • Patent CN103095176A - 聚光型太阳能双发电组件- Google ...

    www.google.com/patents/CN103095176A?cl=zh - 轉為繁體網頁
    2013年5月8日 - [0027] 图5为本发明涉及到截止波长为550nm的短波通滤光膜设计示意图 ... 由图中太阳光光谱曲线(浅蓝),晶体硅光谱吸收特性曲线(红色),砷化镓 ...
  • Chinese - Google

    www.google.com/patents/CN1087716A?cl=zh - 轉為繁體網頁
    1994年6月8日 - 在地面上测定的太阳光光谱辐射率相对来讲也是恒定的。 .... 界为符合V(λ)的视觉特征,生产了相当多在550nm处有一特强光波长的电光源产品,如 ...
  • [PDF]檢視/開啟 - 正修科技大學

    ir.csu.edu.tw/bitstream/987654321/1808/1/碩士論文-劉展志.pdf
    由 劉展志 著作 - ‎2008 - ‎相關文章
    130 nm 且使用濃度1 M 之電解液時,電致色變元件在波長550 nm 處可. 得最佳著褪色穿透 ..... 2-1(a)、(b)分別為大氣外與地表太陽光光譜[10]及可見光光譜圖。因光線.
  • [PDF]楊吉水教授--光與化學導論

    www.ch.ntu.edu.tw/~camp/camp96a/profyang.pdf
    發明了分光儀,發現太陽光光譜中574條黑線. 在波動學說 .... 550 nm. Department of Chemistry. National Taiwan University. National Taiwan University. 冷光種類.
  • [PDF]99 年度台日技術合作計畫專家指導「太陽光電二級 ... - 經濟部

    www.moea.gov.tw/mns/ietc/content/wHandMenuFile.ashx?menu_id...
    1999年12月20日 - 條件,並參考IEC 60904-7 利用全日照之太陽光光譜分佈和. 基準電池光譜響應進行 .... 面積:20mm x 20mm. 5. 單色光強度:50μW/m2(@550nm). 6.
  • [PDF]Tandem cell - 國立交通大學機構典藏

    ir.nctu.edu.tw/bitstream/11536/38909/1/453301.pdf
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    太陽光光譜範圍加大,使之有最好的元件效率。另外,在兩 ...... PCBM相似,主要是吸收短波段波長的光(400~550 nm),而Pentacene/C60剛好可以補足. 太陽光較長 ...



  • 增量资金被堵在门外,依靠这溃不成军的存量,想再拉出几根长阳的牛气,未免心有余而力不足。

    blue Sickle Cell Disease liquidity 镰刀形红血球贫血症 不能有效地输送氧气 细胞癌变。细胞不但不死,还无节制地大量增殖 从癌症发生原因的最新观点来看,是在干细胞阶段发生了突变。细胞不能按正常的途径分化成熟,而是形成大量未充分分化的细胞。一个最明显的例子就是白血病,血液里有大量未充分分化的白细胞。所以肿瘤也有自己的干细胞,叫癌症干细胞,只有它们才能在肿瘤扩散中起作用,在身体的其它地方落脚生根,发展出新的肿瘤。并且它们不怕化疗

    空心氧化铁纳米颗粒可做为多药耐药性载体-观察-生物探索

    www.biodiscover.com/news/hot/research/103159.html
    轉為繁體網頁
    2012年12月10日 - 本项研究中,我们应用多巴胺-血清蛋白作为修饰分子吸附并包裹抗肿瘤药物阿霉素(DOX)于空心氧化铁纳米颗粒中,制备出一种新型的载药 ...
  • 研究较广泛的磁性纳米颗粒_颗粒|纳米|纳米颗粒|氧化_磁性

    cx.yunshuba.cn/y/d/d.html
    轉為繁體網頁
    本项研究中,我们应用多巴胺-血清蛋白作为修饰分子吸附并包裹抗肿瘤药物阿霉素(DOX)于空心氧化铁纳米颗粒中,制备出一种新型的载药模型(HIONPs-DOX)。
  • 纳米技术与肿瘤诊疗 - 士捷医疗设备(武汉)有限公司

    medvisionus.com/html/hangyezixun/68.html - 轉為繁體網頁
    2014年10月15日 - 一项发表在JAMA NEUROLOGY上的研究利用多巴胺-血清蛋白作为修饰分子吸附并包裹抗肿瘤药物阿霉素(DOX)于空心氧化铁纳米颗粒中,制备出 
  •  


    另一种情况不是细胞衰亡,而是细胞变异。比如镰刀形红血球贫血症。由于血红蛋白上一个氨基酸单位的变化,红血球虽然生成了,却不能有效地输送氧气。更坏的情况是细胞癌变。细胞不但不死,还无节制地大量增殖。从癌症发生原因的最新观点来看,是在干细胞阶段发生了突变。细胞不能按正常的途径分化成熟,而是形成大量未充分分化的细胞。一个最明显的例子就是白血病,血液里有大量未充分分化的白细胞。所以肿瘤也有自己的干细胞,叫癌症干细胞,只有它们才能在肿瘤扩散中起作用,在身体的其它地方落脚生根,发展出新的肿瘤。并且它们不怕化疗。这是化疗能杀死大部分的肿瘤细胞,却不能根治肿瘤的原因。在这些情况下,变化了的干细胞本身就是疾病之源。
     
     
    对于丧失功能的细胞,比如镰刀形红血球,可以在人体内引入正常的造血干细胞,或从患者的骨髓中取出造血干细胞,放入正常的血红蛋白基因,再输回患者体内,以生成功能正常的红血球。对于白血病,也可以用正常骨髓的干细胞来取代患者的骨髓,生产出正常的白细胞。对于其它肿瘤,就要找到消灭它们的癌症干细胞的办法,比如激活它们的程序控制自杀机制(programmed cell death,或称 apoptosis),或找到阻止这些癌症干细胞生成新细胞的方法,从源头上消灭肿瘤。
     
    市場調查報告書 - 213124


    血清蛋白是衡量血样中蛋白质总量的一个标准。健康者的人体血样大约由70%的蛋白质组成,它们在调节凝血和提供免疫力等方面扮演着重要角色。血清蛋白改变有可能是存在健康问题的迹象,因此可以给医生提供重要的诊断信息
    在血清蛋白检查中,会从患者体内抽取血样。为了更好的测试,可能会用多个试管装血。对抽血害怕的人最好是询问医生了解基本情况,并可以考虑在抽血前后吃些小吃缓解压力。抽出的血样会送到实验室进行化验。
    确定血清蛋白数量有可能技术可以选择。血液中有球蛋白和白蛋白两种蛋白质,它们构成血液蛋白质的大部分,并且比例也保持相对稳定。如果这两种蛋白质的比例发生变化,往往与存在健康问题有关。可以导致血清蛋白变化的疾病包括脱水糖尿病心力衰竭,肾脏病,肺结核,肝脏疾病,自身免疫性疾病和白血病等血液疾病。
    正常血清蛋白是每十升6到8克。如果发现这个值异常,还需要额外做检查找出原因。在诊断时,医生还会将其他检查结果考虑在内,如肝脏疾病患者的肝酶水平异常等。此外,医生还会把血清蛋白检查作为常规体验的一部分,观察对特定治疗的反应情况

    鐮形血球貧血症的開發中產品分析

     
    https://zh.wikipedia.org/zh-hk/近紅外線影像技術
    ... 的光有不同的感覺力,經過實驗,視覺最敏感的波長在550nm前後,屬於黃綠色光。 ..... 直到1873年,德國的H. W. Vogel研究太陽光光譜特性時,偶然發現在鹵化銀 ...
  • [PDF]光度單位 - 農業試驗所機構典藏系統

    ir.tari.gov.tw:8080/bitstream/345210000/2995/1/journal_jts_85_09.pdf
    由 姚銘輝 著作 - ‎2011
    太陽光光譜由280nm. 紫外線至4000nm之紅外光皆涵蓋,但一. 般量測範圍 ... 550nm(綠光)最高(圖一),而白天. 太陽光連續拍攝結果,在清晨藍光及傍. 晚紅光有較高 ...
  • [PDF]2011ICEICEW0151886

    www.wisinfo.com.tw/paper/2011/2011ICEICEW0151886.pdf
    由 WYL Hsieh 著作 - ‎相關文章
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    出版商Global Markets Direct
    出版日期內容資訊英文 164 Pages
    價格

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    Before the financial crisis, dealer market-making held a powerful place in the nation’s biggest investment banks. The fresh-out-of-college traders that shuffled in and out of Manhattan bank buildings each day handled the banks' inventories of bonds worth hundreds of millions of dollars, which they used as starting capital to make their own trades, says Lawrence McDonald, a former Lehman Bros. corporate bond trader. The holdings, which were used to make markets for each type of corporate security, would fit into two categories, or books.
    “The front book is the facilitation book. That’s the book for client liquidity. The back book is your prop position. That book was responsible for a lot of profits on the Street in 2007, and that today pretty much doesn’t exist,” said McDonald, who authored A Colossal Failure of Common Sense, a bestseller about the bank's demise.
    That system crumbled in the years after the financial crisis. The facilitation books shrank in size while the proprietary trading books became virtually non-existent. Dealer balance sheet sizes fell to a fraction of what they once were.
    The smaller amount that dealers hold on their books means they can’t unconditionally buy bonds that investors are trying to sell, especially in large blocks