钴(Ⅱ)与5-(5-碘-2-吡啶偶氮)-2,4-二氨基甲苯体系的络合物吸附波研究及应用

在pH为8.0的NaH2PO4-Na2HPO4缓冲溶液中,钴(Ⅱ)-NH2OH·HCl-5-(5-碘-2-吡啶偶氮)-2,4-二氨基甲苯(5-I-PADAT)体系在-1.25V(vs.SCE)产生—灵敏的络合物吸附波.据此建立了极谱法测定微量钴的新方法,该波一阶导数峰电流与钴(Ⅱ)的质量浓度在1-25μg·L-1范围内呈的线性关系,检出限达0.12μg·L-1.研究了该体系的极谱波性质,结果表明该波为催化吸附波,其电极过程为不可逆过程,电子转移数为2.此外还实验了多种离子对峰电流I′p的影响,所拟方法用于维生素B12注射液和陕南镍矿中微量钴的测定,结果满意.     

印刷机张力控制系统设计

基于印刷行业张力控制原理,分析了张力控制系统组成,并介绍了以STM32为主控芯片及外围电路开发而成的闭环张力控制系统,该系统不仅控制精度高,响应速度快,而且操作简单,有合理的PID控制功能,适用于多种印刷材料。它还可以计算出材料筒的直径,使整个张力控制过程更为合理。     

基于灰度概率统计的视觉注意改进算法

分析了基于自底向上的视觉注意计算模型的感兴趣区域检测方法;它分别提取颜色、灰度、纹理三个特征图像,然后进行线性融合得到综合显著图。而显著目标通常自身灰度相近,但与背景灰度不同,根据这个特性结合灰度概率统计方法对视觉注意计算模型进行改进。实验结果验证了,该模型能够更好的模拟视觉注意的过程,而且计算复杂度较低。     

Synthesis and Biological Activities of Novel 1,2,4-Triazole Derivatives Containing 1,2,3-Thiadiazole Ring

A series of novel 1,2,4-triazole derivatives containing 1,2,3-thiadiazole ring was designed and synthesized. Their structures were confirmed by IR, 1^H NMR, high resolution mass spectrometer（HRMS） and electrospray ionization-mass spectromcter（ESI-MS） combined with melting points and elemental analysis. Preliminary bioassays indi- cate that these compounds exhibit good insecticidal activity against Aphis laburni at 100 μg/mL, especially compound 6b shows mortality of no less than 95%. Most of the compounds show good activities against tobacco mosaic virus（TMV） with different modes in vivo at 100 μg/mL. Compound 6d standed out, showing a good insecticidal activity and very high induction effects against TMV in vivo. Collectively, our data demonstrate a new strategy for insect and virus control.     

水凝胶微流控芯片的快速加工及在细胞培养检测中的应用

采用具有紫外光聚合性能的聚乙二醇(PEG)基水凝胶材料, 通过紫外光聚合作用快速加工双层水凝胶微流控芯片, 并验证了其对肿瘤细胞代谢液进行检测的可行性. 与传统微流控芯片材料相比, 该水凝胶芯片材料具有更好的生物相容性及可操控性, 可直接加工成形, 在生物学领域特别是细胞培养过程控制方面具有良好的应用前景. 实验结果表明, 该水凝胶微流控芯片可在微尺度空间有效模拟细胞生长环境, 并实现对细胞连续捕获后的原位培养. 将该芯片与卟啉可视阵列传感器系统结合, 经代谢特征分析可有效区分不同种类肿瘤细胞, 实现芯片细胞培养平台上的细胞代谢指纹快速可视化传感检测.     

Supercapacitor Performance of Hollow Carbon Spheres by Direct Pyrolysis of Melamine-formaldehyde Resin Spheres

The nitrogen and oxygen co-doped hollow carbon spheres(HCSs) were prepared via a simple pyrolysis of solid melamine-formaldhyde resin spheres. The carbonization temperature has an important influence on the specific surface area, pore-size distribution and heteroatom contents of HCSs. The synergistic effects of those physical and chemical properties on supercapacitor performance were systematically investigated. Among the HCSs obtained at different temperatures, HCSs-800(co-doped HCSs at 800 ℃) exhibits the best reversible specific capacitance in 2 mol/L H₂SO₄ electrolyte and meanwhile maintains a high-class capacitance retention capability. The nitrogen heteroatoms were confirmed to play a crucial role in improving capacitance in an acid medium. This kind of nitrogen doped HCSs is a potential candidate for an efficient electrode material for supercapacitors.     

功能梯度压电/压磁双材料的周期界面裂纹问题

研究反平面载荷作用下压电/压磁双材料的周期界面裂纹问题,压电/压磁双材料由有限厚度的功能梯度压电层和功能梯度压磁层粘结而成.为便于分析,假设压电层和压磁层的材料性质沿着裂纹的法线方向呈指数变化,基于分离变量和Hilbert核奇异积分方程方法,获得应力强度因子的数值解.数值算例讨论层厚、周期带长度、梯度参数以及材料参数变动等对应力强度因子的影响.结果发现层厚以及裂纹间距的增大会降低裂纹尖端应力强度因子,梯度参数的改变对应力强度因子也有显著的影响.材料参数变动的讨论发现弹性参数的变动对应力强度因子影响最大,其次为电参数,磁参数的变动对应力强度因子影响最小.     

Homogeneous precipitation of α-phase Co–Ni hydroxides hexagonal platelets

This paper describes the synthesis of α-phase Co–Ni hydroxides hexagonal platelets through homogeneous precipitation, using hexamethylenetetramine (HMT) or urea as a hydrolytic agent. In the CoCl₂–NiCl₂–HMT system, pure α-phase can be synthesized at the concentrations of both metal ions higher than 20 mM, while in the CoCl₂–NiCl₂–urea system, the formation of pure α-phase is independent of the concentrations of the metal ions. When using HMT, monodisperse hexagonal platelets of α-phase Co–Ni hydroxides can be produced in the presence of polyvinylpyrrolidone (PVP). Cyclic voltammogram curve of the hexagonal platelets prepared with HMT demonstrates electrochemical performance superior to that of urea.     

New physical effects on the decay Bs →γγ in the technicolor model

In this paper we calculate the contributions to the branching ratio of Bs →γγ from charged pseudo-Goldstone bosons appearing in the one generation Technicolor model. We find that the theoretical value of the branching ratio, BR（Bs →γγ）, including the contributions of PGBs, P^± and P8^±, is very different from the standard model （SM） prediction. The new physical effects can provide a one to two order of magnitude enhancement of the SM results. It is shown that the decay Bs →γγ can test new physical signals from the technicolor model.     

北五味子中的一个新单萜苷

红花（Carthamus tinctorius L.）为菊科红花属一年生草本植物的干燥花,是活血通经、去痰止痛的药食同源中药,红花的有效成分为查耳酮类、脂肪酸、多糖和其它一些类化合物,其中红花多糖能促进淋巴细胞转化,增加脾细胞对羊红细胞空斑形成的细胞数量,对抗强的松龙的免疫抑制作用等,是一种新的、值得进一步研究的免疫调节剂,目前,人们正深入研究红花多糖的其它药用价值,但对其结构的研究国内外尚未见报道。