光谱法研究2-(4-二甲氨基苯基)-5-氟-6-吗啉-1-氢-苯并咪唑与小牛胸腺DNA的相互作用

研究了2-(4-二甲氨基苯基)-5-氟-6-吗啉-1-氢-苯并咪唑(1)在不同pH条件下的紫外-可见吸收光谱,采用非线性最小二乘法得出分子1的三级加质子常数lgβ₁, lgβ₂, lgβ₃分别为4.96±0.03, 5.72±0.07和7.95±0.10。当pH 3.40时,分子1主要以一价离子状态存在,紫外-可见吸收光谱及荧光光谱表明该条件下分子与小牛胸腺DNA存在明显的相互作用,并得出分子1与DNA的结合常数K_b为(2.30±0.10)×104 mol-1·L。当分子浓度为10-8～1.2×10-6 mol·L-1时,荧光强度随DNA含量的增加而线性增强,分子1是一种潜在的测定DNA的定量试剂。     

一种高压光学样品池系统的设计与实验研究

设计和研制了一种用于溶液样品光学特性原位检测的高压光学样品池成套系统,组件包括手动泵、增压器和高压样品池。其中样品池开有3处光学窗口,以水为传压介质,设计的最高使用压力为600MPa。当用JGS1石英作窗口时,密封和保压效果良好;由于受到石英材质强度的限制,使用压力应控制在300MPa以下。为检验该系统在高压原位检测方面应用的可行性,进行了色氨酸高压荧光光谱的采集。     

N掺杂对α-石墨炔表面吸附H_2O,H,O和OH的电子性质和磁性的影响

石墨炔是一种新型的二维(2D)碳的同素异形体,炔键单元的高活性使其在小分子吸附方面相比石墨烯更具优势.本文基于密度泛函理论(DFT),研究了H_2O和H、O及OH分别在原始的和掺杂了N原子的α-石墨炔上的相互作用.研究结果表明,N掺杂和小分子吸附能够改变α-石墨炔的电子结构和磁性. N原子掺杂后α-石墨炔对小分子的吸附能力明显增强. H、O原子和OH吸附在N原子掺杂体系前后表现出明显的磁性差异:H原子和OH吸附在纯净的α-石墨炔上体系显示磁性,N原子掺杂后,磁性消失;而O原子则是吸附在纯净的α-石墨炔上未表现出磁性,N原子掺杂后,体系出现磁性.此外,α-石墨炔对水分子的吸附作用较弱,受范德瓦耳斯作用影响较大,属于物理吸附.本研究将为α-石墨炔中N杂质检测以及α-石墨炔基气体传感器的设计研究提供新的思路.     

Low-loss terahertz waveguide with InAs-graphene-SiC structure

We demonstrate a low-loss terahertz waveguide based on the InAs-graphene-SiC structure. By analyzing the terahertz waveguide proposed in this paper, we can obtain that it is the characteristic of a low transmission loss coefficient(αloss≈0.55 dB/m) for fundamental mode(LP01) when the incident frequency is larger than 3.0 THz. The critical radii of the inside and outside cylinders have been found for the high-quality transmission. The large inside radius and the high transmission frequency result in a flat transmission loss coefficient curve. As a strictly two-dimensional material, the double graphene surface rings perform better to improve the quality of transmission mode. These results provide a new idea for the research of the long-distance THz waveguide.     

High performance oscillator with 2-mW output power at 300 GHz

Material structures and device structures of a 100-GHz InP based transferred-electron device are designed in this paper. In order to successfully fabricate the Gunn devices operating at 100 GHz, the InP substrate was entirely removed by mechanical thinning and wet etching. The Gunn device was connected to a tripler link and a high RF(radio frequency)output with power of 2 mW working at 300 GHz was obtained, which is high enough for applications in current military electronic systems.     

不同工艺尺寸CMOS器件单粒子闩锁效应及其防护方法

基于建立的不同工艺尺寸的CMOS器件模型,利用TCAD器件模拟的方法,针对不同工艺CMOS器件,开展了不同工艺尺寸CMOS器件单粒子闩锁效应(SEL)的研究。研究表明,器件工艺尺寸越大,SEL效应越敏感。结合单粒子闩锁效应触发机制,提出了保护带、保护环两种器件级抗SEL加固设计方法,并通过TCAD仿真和重离子试验验证防护效果,得出最优的加固防护设计。结果表明,90nm和0.13μm CMOS器件尽量选用保护带抗SEL结构,0.18μm或更大工艺尺寸CMOS器件建议选取保护环抗SEL结构。     

Electronic and optical properties of 3N-doped graphdiyne/MoS2 heterostructures tuned by biaxial strain and external electric field

The construction of van der Waals (vdW) heterostructures by stacking different two-dimensional layered materials have been recognised as an effective strategy to obtain the desired properties. The 3N-doped graphdiyne (N-GY) has been successfully synthesized in the laboratory. It could be assembled into a supercapacitor and can be used for tensile energy storage. However, the flat band and wide forbidden bands could hinder its application of N-GY layer in optoelectronic and nanoelectronic devices. In order to extend the application of N-GY layer in electronic devices, MoS₂ was selected to construct an N-GY/MoS₂ heterostructure due to its good electronic and optical properties. The N-GY/MoS₂ heterostructure has an optical absorption range from the visible to ultraviolet with a absorption coefficient of 10⁵ cm^-1. The N-GY/MoS₂ heterostructure exhibits a type-Ⅱ band alignment allows the electron-hole to be located on N-GY and MoS₂ respectively, which can further reduce the electron-hole complexation to increase exciton lifetime. The power conversion efficiency of N-GY/MoS₂ heterostructure is up to 17.77%, indicating it is a promising candidate material for solar cells. In addition, the external electric field and biaxial strain could effectively tune the electronic structure. Our results provide a theoretical support for the design and application of N-GY/MoS₂ vdW heterostructures in semiconductor sensors and photovoltaic devices.     

基于气泵的声管实验及分析

为研究声管的发声频率,进行了实验设计和分析.声管转动发声是由于空气在声管中的流动,考虑实际的实验条件,设计了气泵吹气代替声管转动的实验方式,改变吹气速率并测量发声频率.通过对实验结果的分析发现,此时的声管不符合两端开口即两端为波腹的条件,而是一端波节、一端波腹.声管的发声频率取决于其长度,符合驻波特性,发声时吹气速率与波纹长度须满足共振条件.研究结果有助于对驻波的理解和相关内容的实验设计.     

气相色谱-红外光谱联用分离鉴定烷基膦酸酯类同分异构体

1　引　　言烷基膦酸 O 烷基酯是禁止化学武器公约禁控化学品附表中一类重要的化合物。这类化合物的结构中有 3个烷基基团 ,进行组合搭配后可产生多种同分异构体。因此 ,化学武器履约核查时很难对这类化合物进行分离并作出明确鉴定。异丙基膦酸二正丙酯和异丙基膦酸乙基丁基酯是一对同分异构体 ,是国际联试中由中国提供的样品 ,性质非常相似 ,普通方法很难分离。本文利用GC Tracer FTIR仪器Tracer接口的ZnSe片可移动的特点 ,优化色谱条件 ,实现了两化合物的完全分离。同时通过联合运用红外光谱鉴定其结构 ,获得了满意的结果。2　实验…     

中性红褪色光度法测定水中二氧化氯

１引言二氧化氯（ＣｌＯ２）是广谱杀菌消毒剂，空气或水中百万分之几的ＣＯ２，即可发挥作用．在多种测定方法中褪色光度法较简便易行，国外报道该类方法检测下最低达０．０１ｍｇ／Ｌ，最宽线性范围为０～２ｍｇ／Ｌ．本文研究了中性红的褪色反应，所建立的光度法其检测下限达０．０１ｍｇ／Ｌ，线性范围０～３．ｍｇ／Ｌ，可用于水中ＣｌＯ２测定．２实验部分２．１仪器及试剂岛津ＵＶ－２４０分光光度计．中性红（指示剂级）、蒸馏水．其它试剂皆为分析纯．中性红溶液：准确称取中性红ｍｏｌ／Ｌ硫酸溶解配成１．０×１０－３ｍｏｌ／Ｌ…