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Mesoporous Ag nanocubes synthesized via selectively oxidative etching at room temperature for surface- enhanced Raman spectroscopy

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Nano Research 2015年第7期8卷 2351-2362页

作者： Lin Gan Meijia Yang Xi Ke Guofeng Cui Xudong Chen Shiva Gupta William Kellogg drew Higgins Gang Wu Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education of China Sun Yat-sen University Guangzhou 510275 China Electronic Packaging Electrochemistry Laboratory School of Chemistry and Chemical Engineering Sun Yat-sen University Guangzhou 510275 China Department of Chemical and Biological Engineering University at Buffalo The State University of New York Buffalo New York 14260 USA Department of Chemical Engineering University of Waterloo Waterloo Ontario N2L 36 I Canada

Silver nanocubes enriched with {100} facets have been extensively used for surface-enhanced Raman scattering. Herein, we report a new water-phase synthesis method for weU-defined Ag nanocubes with tunable sizes via a two-step procedure at room temperature. First, irregularly shaped Ag nanoparticles （INPs） were prepared by reducing silver ammonia solution using ethylal. Second, the agglomerated INPs were selectively etched with HNO3 and C1- to yield {100} facet-rich mesoporous Ag nanocubes. The mechanism of Ag-nanocube formation and growth was investigated in detail by elucidating the involved chemical reactions and physical changes at each step during the synthesis. The addition of C1- anions was responsible for facilitating Ag nanoparticle growth by removing surface-adsorbed Ag＋ species, thereby eliminating inter-particle repulsive forces. This agglomeration was found crucial for the subsequent selective oxidation of Ag nanoparticles because the protective agent used, polyvinylpyrrolidone （PVP）, was the most effective one for adsorption on the surfaces of Ag nanoparticles of size greater than approximately 50 nm. Importantly mesopores were found inside the Ag nanocubes; this can be attributed to the unavoidable imperfect packing during the agglomeration of INPs. The newly prepared Ag nanocubes were further used to enhance the Raman signal of rhodamine 6G, which is capable of reducing the detection limitation to 10-16 mol·L-1.

关键词： Ag nanocube,selective etching water phase synthesis room tempersture surface-enhanced raman scattering(sers)

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Working Toward Rapprochement

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Beijing Review 2009年第51期 16-17页

作者： drew THOMPSON

U.S. President Barack Obama\'s election and his strategy present opportunities for the United States tobuild a better relationship with China but bothsides have work to do

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数据缺陷让人更难判断疫情走向

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商业周刊（中文版） 2022年第8期 4-8页

作者： drew Armstrong 易语(译) 不详

美国疾控中心正在使用的数据统计方法未能跟上性质已发生变化的疫情。2022年1月初,时值新冠疫情暴发两年之际,美国马萨诸塞州在其新冠统计中加入了一组新的数据,开始把因为感染新冠入院的病人和因为其他疾病入院却恰巧也感染新冠病毒的... 详细信息

美国疾控中心正在使用的数据统计方法未能跟上性质已发生变化的疫情。2022年1月初,时值新冠疫情暴发两年之际,美国马萨诸塞州在其新冠统计中加入了一组新的数据,开始把因为感染新冠入院的病人和因为其他疾病入院却恰巧也感染新冠病毒的病人分开进行统计。医院大墙之内一切还是老样子:因为车祸入院的新冠阳性病人仍需隔离。但是,该州的相关统计数据却发生了巨大变化,数字一下子出现了腰斩。

关键词：美国马萨诸塞州美国疾控中心阳性病人数据缺陷相关统计数据数据统计方法疫情

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Working Toward Rapprochement

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Beijing Review 2009年第51期52卷 16-17页

作者： drew THOMPSON

U.S. President Barack Obama’s election and his strategy present opportunities for the United States tobuild a better relationship with China but bothsides have work to

关键词： Working Toward Rapprochement

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A Mathematical Model for Nutrient Metabolic Chemistry

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Applied Mathematics 2018年第6期9卷 647-671页

作者： Donald A. drew Department of Mathematical Sciences Rensselaer Polytechnic Institute Troy USA

A model based on chemical kinetics for the rate of utilization and/or storage of carbohydrates, fats and proteins is derived and analyzed. This system is studied under different conditions of supply and usage and for short term dynamics and long term dynamics. Both the short term and long term models indicate that starting above an equilibrium threshold leads to growth of the stored species. Results from the short-term and long-term submodels show that the qualitative behavior depends on the levels of certain enzymes. The analysis of a model for enzyme dynamics indicates that the steady-state level of an enzyme should depend on the rate of supply of the substrate.

关键词： Nutrient Metabolic Chemistry

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drew和Nancy的美国生活英语

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2006年

作者： drew Kumpf Nancy Sun 马建军时真妹审译

本书按照衣食住行四大方面来编排图书，内容包括：住在美国、吃在美国、穿在美国、住在美国等。

ISBN: (数字)7561130295

ISBN: (纸本)7561130295

本书按照衣食住行四大方面来编排图书，内容包括：住在美国、吃在美国、穿在美国、住在美国等。

关键词：口语英语美国

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Determination of Statistical Properties of Microtubule Populations

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Applied Mathematics 2016年第13期7卷 1456-1475页

作者： Tyson DiLorenzo Lee Ligon Donald drew Department of Mathematics Rensselaer Polytechnic Institute Troy USA Department of Biological Sciences and Center for Biotechnology and Interdisciplinary Studies Rensselaer Polytechnic Institute Troy USA

Microtubules are structures within the cell that form a transportation network along which motor proteins tow cargo to destinations. To establish and maintain a structure capable of serving the cell’s tasks, microtubules undergo deconstruction and reconstruction regularly. This change in structure is critical to tasks like wound repair and cell motility. Images of fluorescing microtubule networks are captured in grayscale at different wavelengths, displaying different tagged proteins. The analysis of these polymeric structures involves identifying the presence of the protein and the direction of the structure in which it resides. This study considers the problem of finding statistical properties of sections of microtubules. We consider the research done on directional filters and utilize a basic solution to find the center of a ridge. The method processes the captured image by centering a circle around pre-determined pixel locations so that the highest possible average pixel intensity is found within the circle, thus marking the center of the microtubule. The location of these centers allows us to estimate angular direction and curvature of the microtubules, statistically estimate the direction of microtubules in a region of the cell, and compare properties of different types of microtubule networks in the same region. To verify accuracy, we study the results of the method on a test image.

关键词： Microtubule Image Analysis Curvature

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PARALLEL ADAPTIVE SIMULATION OF A PLUNGING LIQUID JET

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Acta Mathematica Scientia 2010年第2期30卷 522-538页

作者： Azat Yu.Galimov Onkar Sahni Richard T.Lahey Jr. Mark S.Shephard Donald A.drew Kenneth E.Jansen Rensselaer Polytechnic Institute

This paper is concerned with three-dimensional numerical simulation of a plunging liquid jet. The transient processes of forming an air cavity around the jet, capturing an initially large air bubble, and the break-up of this large toroidal-shaped bubble into smaller bubbles were analyzed. A stabilized finite element method （FEM） was employed under parallel numerical simulations based on adaptive, unstructured grid and coupled with a level-set method to track the interface between air and liquid. These simulations show that the inertia of the liquid jet initially depresses the pool＇s surface, forming an annular air cavity which surrounds the liquid jet. A toroidal liquid eddy which is subse- quently formed in the liquid pool results in air cavity collapse, and in turn entrains air into the liquid pool from the unstable annular air gap region around the liquid jet.

关键词： plunging liquid jet air entrainment two-phase flows level set method parallel adaptive simulation

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甲醛固定石蜡包埋组织中DNA的降解情况

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中华病理学杂志 2004年第3期33卷 292-293页

作者：田子强刘俊峰王贵英 Eric Smith Paul drew david Watson Glyn G Jamieson 河北医科大学第四医院胸外科石家庄050011 河北医科大学第四医院外科石家庄050011 Department of Surgery Royal Adelaide Hospitalthe University of Adelaide

为了对比国外甲醛固定石蜡包埋组织中DNA的保存质量与国内标本的差异,特设计实验如下。

关键词：甲醛固定石蜡包埋 DNA降解 DNA保存

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“YELLOW RIVER”——POETRY IN ACTION

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Chinese Journal of Applied Linguistics 2004年第5期27卷 115-117页

作者： John drew Henan Normal University

On Flight 3792 from Guangzhou to Zhengzhou,I reachinto the seat pocket in front of me and am surprised to comeacross a magazine in *** is the launch issue of Ni Hao,China Southern Airline’s glossy in-flight magazine.I amsurprised because I am not on an international flight but on adomestic flight.I look around *** there be anyone else onthe flight who is reading this magazine?Most passengers whoare reading are reading a daily newspaper in Chinese.

关键词： POETRY IN ACTION YELLOW RIVER

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