ECR等离子体对单晶硅的低温大面积表面处理

利用电子回旋共振 ( ECR)微波放电等离子体对单晶硅表面进行了低温大面积氮化和氧化处理的探索 ,在低于 80℃的温度下得到了均匀的厚度约为 7nm氮化硅和二氧化硅薄层 .结合等离子体光学诊断和成分探测 ,分析讨论了 ECR等离子处理机理 .结果表明 ,利用这种方法可以在低温条件下在硅表面获得均匀的大面积氮化硅和二氧化硅表层 .     

茂金属聚乙烯共混体系液液相分离行为

研究了茂金属催化的高密度聚乙烯 (mPEO)和传统工艺生产的低密度聚乙烯 (LDPE)共混体系液 液相分离行为 .用DSC测试了共混体系在两种聚乙烯熔点之间的等温结晶动力学 ,发现共混体系经过 15 0℃培养 ,其等温结晶速率明显增快 .在排除成核作用和共结晶的影响后 ,表明上述结果是由于聚乙烯共混体系在熔融态发生了液 液相分离引起的 .从而为聚乙烯共混体系液 液相分离的存在提供了新证据     

Synthesis and mesomorphic properties of some ferroelectric liquid crystals of lactate

A semiperfluorinated chain has been introduced into three series of lactate‐based molecules, and their mesomorphic properties have been studied by DSC and optical polarized microscope. An abnormal phenomenon has been found that the introduction of a triple bond in the core of the molecule, which lengthened the molecule, gave rise to a decrease in the thermal stability of chiral smectic C phase and smectic A phase. 2, 3‐Difluoro substituents of the phenylenic structure hinder the formation of the chiral smectic C phase because of the steric effect.     

分裂窗辐射量线形组合反演陆面温度的影响因子分析

大气特性与地物发射率是影响陆温反演精度的主要因素,不同的分裂窗表达式用于陆温反演存在不同的反演结果,其中两通道辐射量线形组合形式的分裂窗算法受大气影响最小,反演温度的误差也最小.其反演温度的误差与大气透过率和大气向上辐射无关,但与地物的发射率、大气向下辐射相关.分裂窗表达式B(λ,′Ts°)=a.I(λ1)+b.I(λ2)+c中的反演系数a、b与大气向上辐射无关,但分别与通道1、通道2的大气透过率成反比.当定标点发射率不完全一致时,二者还与大气向下辐射相关;相反,如果定标点发射率完全一致,二者与大气向下辐射无关.使用辐射量线性组合的分裂窗形式反演陆温时,当大气向下辐射与地物的P lanck辐射越相近,误差越小.     

Free-Standing CoO-POM Janus-like Ultrathin Nanosheets

A single-step solution-based strategy is used to obtain 2D Janus-like free-standing ultrathin nanosheets build from two structurally unrelated species, that is, polyoxomolybdate (POM) and CoO. A controlled 2D-to-1D morphological transition was achieved by judiciously adjusting the solvent choice. These POM-CoO heterostructures can behave as an ideal catalyst for the epoxidation of styrene. Benefiting from their amphiphilic nature, these 2D POM-CoO nanosheets have also been used as surfactant to emulsify immiscible solvents. It is anticipated that structurally diverse polyoxometalates will offer promise as design elements for variety of structurally and compositionally tunable van der Waals integrated heteromaterials having a broad range applications.     

Cryptanalysis on a Portable Privacy-Preserving Authentication and Access Control Protocol in VANETs

Recently, Yeh et al. proposed a portable privacy-preserving authentication and access control protocol, named PAACP, for non-safety applications in vehicular ad hoc networks. PAACP not only accomplishes authentication, key establishment and privacy preservation, but also considers the scalability and differentiated service access control issues in the protocol design. However, this causes some security flaws. Our results show that PAACP is insecure against privilege elevation attack. In this attack, any two or more vehicles can conspire to elevate access privileges for desired Internet services.     

Synthesis and in vivo distribution of 2-deoxy-2-aminodiglucose-prednisolone conjugate(DPC)

In order to develop a novel kidney-targeted drug delivery system,a small molecular carrier(2-deoxy-2-aminodiglucose) was synthesized,and then the 2-deoxy-2-aminodiglucose-prednisolone conjugate(DPC) was synthesized to verify the kidney targeting capability of the carrier.Both 2-deoxy-2-aminodiglucose and DPC were confirmed by NMR and MS spectrum.The tissue distribution studies showed that DPC presented an excellent kidney targeting property in vivo,compared with prednisolone group, 4.9-fold of drug concentration in kidney was observed in the DPC group.Thus,it indicated that 2-deoxy-2-aminodiglucose could be a potential carrier for kidney-targeted drug delivery.     

2-(4-取代苄基-1,4-高哌嗪-1-基)-N-(5-溴喹喔啉-6-基)乙酰胺衍生物的合成及正性肌力活性研究

设计合成了一系列2-(4-取代苄基-1,4-高哌嗪-1-基)-N-(5-溴喹喔啉-6-基)乙酰胺化合物,测定其对家兔离体左心房搏出量的影响,对化合物的正性肌力活性进行了初步评价.结果显示,一些衍生物在测试浓度下显示出比上市药物米力农更好的正性肌力活性,其中活性最好的化合物是3f,在浓度为3×10-5mol L-1时,增强左心房搏出量的强度达(6.18±0.06)%[米力农:(2.46±0.07)%].实验中所合成的化合物通过IR,1H NMR,MS和元素分析测试进行了确证.