追念钱临照先生--《钱临照文集》读后感

文章叙述了钱临照教授的科学生涯，展示了他对物理学所作的主要贡献和对现代中国科学和教育事业的发展所起的重要作用。文中也包含了作者的一些个人回忆。     

New numerical simulation for fractional Benney–Lin equation arising in falling film problems using two novel techniques

The pivotal aim of the present work is to find the numerical solution for fractional Benney–Lin equation by using two efficient methods, called q ‐homotopy analysis transform method and fractional natural decomposition method. The considered equation exemplifies the long waves on the liquid films. Projected methods are distinct with solution procedure and they are modified with different transform algorithms. To illustrate the reliability and applicability of the considered solution procedures we consider eight special cases with different initial conditions. The fractional operator is considered in Caputo sense. The achieved results are drowned through two and three‐dimensional plots for different Brownian motions and classical order. The numerical simulations are presented to ensure the efficiency of considered techniques. The behavior of the obtained results for distinct fractional order is captured in the present framework. The outcomes of the present investigation show that, the considered schemes are efficient and powerful to solve nonlinear differential equations arise in science and technology.     

用Nicolet 5sxc富里叶变换红外光谱仪对中成药作GC/FTIR分析研究 Ⅰ.红灵散的分析

本文将毛细管气相色谱与Nicolet 5sxc富里叶变换红外光谱联机检测应用于含挥发油的中成药的分析研究。对红灵散中的冰片、麝香酮分别进行了定性定量分析。将红灵散的苯提取液作GC/FTIR定性分析,用气相色谱内标校正因子法测定冰片、麝香酮的含量,其中冰片的加样回收率平均值为100.1％,相对标准偏差为2.0％,麝香酮的加样回收率平均值为97.80％,相对标准偏差为3.5％。     

Well‐posedness of a 1D transport equation with nonlocal velocity in the Lei–Lin space

In this paper, we consider the well‐posedness of a one‐dimensional transport equation with nonlocal velocity in the Lei–Lin space . We first modify the product estimate and then establish the global existence of solutions to the Cauchy problem with small enough initial data. Finally, we discuss the stability of the global solution. Copyright © 2016 John Wiley & Sons, Ltd.     

Lin28特异性结合let-7 RNA结构基础

let-7 miRNA家族控制许多决定细胞命运的基因的表达,从而影响细胞的多能性、分化和转化．Lin28是一个let-7生物合成的转录后抑制因子,其碳端的锌指结构域特异性地结合一个保守的GGAG或者一个类似GGAG的let-7 miRNA模块．作者报道了人源Lin28与5′-A–2A–1G1G2A3G4-3′ let-7 RNA复合物的核磁共振结构．Lin28中两个Lin28 ZKD识别了RNA中的G1G2A3G4．复合物所有的碱基采取反式构象,RNA的骨架因为Lin28的结合变得弯曲,与之前报道的晶体结构一致而与NMR结构不同,从而进一步确认了Lin28识别RNA的作用模式．     

Developmental changes in hematopoietic stem cell properties

Hematopoietic stem cells (HSCs) comprise a rare population of cells that can regenerate and maintain lifelong blood cell production. This functionality is achieved through their ability to undergo many divisions without activating a poised, but latent, capacity for differentiation into multiple blood cell types. Throughout life, HSCs undergo sequential changes in several key properties. These affect mechanisms that regulate the self-renewal, turnover and differentiation of HSCs as well as the properties of the committed progenitors and terminally differentiated cells derived from them. Recent findings point to the Lin28b-let-7 pathway as a master regulator of many of these changes with important implications for the clinical use of HSCs for marrow rescue and gene therapy, as well as furthering our understanding of the different pathogenesis of childhood and adult-onset leukemia.     

Global well‐posedness and blow‐up criterion for the periodic quasi‐geostrophic equations in Lei‐Lin‐Gevrey spaces

In this paper we consider a periodic 2‐dimensional quasi‐geostrophic equations with subcritical dissipation. We show the global existence and uniqueness of the solution for small initial data in the Lei‐Lin‐Gevrey spaces . Moreover, we establish an exponential type explosion in finite time of this solution.     

三维非定常可压跨声速有旋流动的统一变域变分理论

本文利用Ｃｌｅｂｓｃｈ变量,应用半反推法首次建立了三维非定常可压跨声有旋流体的广义变分原理及变分原理族,应用变域变分工具,几乎所有界面条件（包括激波、尾涡面条件等）都转化成了自然边界条件,这给有限元计算带来了很大的方便。     

火焰原子吸收光谱法快速测定矿石中高含量的锌

在对已有的岩矿中锌含量的测试方法进行分析、研究、探讨的基础上,提出了选用锌的次灵敏线307.6nm,以空气/乙炔火焰原子吸收光谱法测定矿石中高含量锌的方法,并进行了条件实验研究.采用本方法测定国家矿石铅锌矿标准物质中锌的含量,测定值与认定值相符,并且该方法的准确度和精密度均符合地质分析测试的要求.     

The Radial Defocusing Nonlinear Schrödinger Equation in Three Space Dimensions

We study the defocusing nonlinear Schrödinger equation in three space dimensions. We prove that any radial solution that remains bounded in the critical Sobolev space must be global and scatter. In the energy-supercritical setting we employ a space-localized Lin–Strauss Morawetz inequality of Bourgain. In the intercritical regime we prove long-time Strichartz estimates and frequency-localized Lin–Strauss Morawetz inequalities.