团簇Co3FeP异构化反应的热力学与动力学研究

为了寻找团簇Co₃FeP的稳定性、结构和内部作用力等规律，利用密度泛函理论，在B3LYP/Lanl2dz的量化水平下对团簇Co₃FeP进行理论计算，得到5种优化构型，并从化学反应热力学与动力学的角度对其异构化反应中的反应物、过渡态和生成物进行了讨论分析。结果表明，所有构型均为C1对称且构型的空间结构对其熵值有影响；构型的稳定性主要由金属原子与非金属原子所决定，并且在常温常压下构型1^（3）、2^（3）和3^（3）可以稳定存在，是大部分异构化反应的最终产物。因此，在实际材料的开发中，不仅需要注意金属原子与非金属原子之间的作用力以确保构型的稳定性，还应首先考虑对稳定构型1^（3）、2^（3）和3^（3）进行相关研究。     

Self-rolled TiO_2 microscroll/graphene composite for electrochemical dopamine sensing

Dopamine is an important neurotransmitter,and nonenzyme electrochemical sensor of dopamine detection based on highly active material is urgently demanded.In this work,an electrochemical sensor with high sensitivity and selectivity based on self-rolled TiO_2microscroll/graphene composite was developed and validated for dopamine sensing.The device exhibited a superior performance for dopamine detection with a detection limit of 4.25×10~(-9)mol L~(-1),and in the dopamine concentration range of 0.06–90μmol L~(-1),the oxidation currents increased linearly with the concentration.The remarkable performance enhancement was mainly ascribed to the increased surface area due to the porous surface of the TiO_2nanomembrane and highly conductive graphene therein.In addition,we have demonstrated that the sensor could be effectively used on detecting dopamine concentrations in urine samples.Our work demonstrates that the current microscroll-based device is promising in the field of real-time health monitoring for future human community.     

La$_{{1-x}}$Sr$_{x}$TiO$_{3}$ 薄膜的高通量 X 射线衍射

高通量材料合成方法和高通量材料表征手段区别于传统低效率的 "试错法"材料发展方法, 极大地加速了材料科学的变革和发展. 通过设计程序进行了高通量 X 射线衍射实验, 在保证数据分辨率条件下, 高效地表征了 La$_{1-x}$Sr$_{x}$TiO$_{3}$ 薄膜上多个数据位点的晶体结构, 验证了其成分的连续变化性质, 为后续开展更多类型的高通量 X 射线衍射实验提供了指导.     

基于三维点云的岩体结构面自动分类与参数计算

结构面间距是岩体稳定性和力学特性分析中的一个重要参数，在岩石力学、采矿工程、边坡监测等领域的数值计算中广泛应用.本文以岩体边坡露头为研究对象，基于非接触测量获得的三维点云数据，提出一种基于密度聚类的结构面细化分类方法；在结构面粗略分组提取的基础上，通过投影变换、散乱点拟合等算法，求得结构面间距和岩体体积节理数.设计开发了结构面细化分类及间距等参数计算与分析原型系统，实际案例分析表明，本文方法可有效实现结构面的自动细化分类，并能够计算出间距等相关参数，可为岩体质量分级和岩体稳定性分析等提供方法支撑.     

单快拍相干信号自适应波束形成方法

针对低快拍条件下相干信号波束形成问题,提出一种单快拍相干自适应波束形成方法。首先,构造Duvall特征消除器滤除阵列接收信号中的期望信号,再利用空间平滑方法解相关。然后,依据Hung Tuner算法对平滑后的协方差矩阵进行Gram Schmidt正交化,快速重构干扰信号子空间。最后,将静态权矢量在干扰子空间内的正交投影作为波束形成最优权矢量。该算法可有效避免协方差矩阵求逆和特征分解造成的复杂计算,且能降低由于期望信号泄露造成的子空间估计误差,在单快拍条件下性能良好。仿真分析验证了算法的优越性和理论分析的有效性。     

Fe~(3+)-水合红菲绕啉二磺酸钠分光光度法测定异烟肼

基于异烟肼分子结构中的酰肼基具有较强的还原性,可将Fe~(3+)还原为Fe~(2+),选择水合红菲绕啉二磺酸钠作为Fe~(2+)的显色剂,建立了可见分光光度法测定异烟肼的新方法.在最佳实验条件下,异烟肼的浓度在0.04~3.2μg·mL-1范围内符合比尔定律,表观摩尔吸光系数ε=1.14×104 L·mol~(-1)·cm~(-1),检测限为0.033μg·mL~(-1).方法可用于异烟肼片剂和尿样中异烟肼含量的测定.     

血清miRNA提取方法的优化

利用正交试验法优化血清miRNA的提取方法,为进一步研究血清miRNA作为生物标记物提供方法学基础.本文以hsa-miRNA-223-3p,hsa-miRNA-483-5p和hsa-miRNA-16为检测目标,通过比较Trizol法和Trizol+酚/氯仿法的miRNA提取效率和qPCR检测结果,应用正交试验选择出最优实验方案.结果表明血清miRNA的最优提取方法为:血清用DEPC水4倍稀释,离心条件为4℃,12 000r·min-1,离心时间为10min,Trizol法提取.     

Recent advances and challenges in materials for 3D bioprinting

3D bioprinting has been developed as a promising technology in a wide variety of biomedical applications. However, the successful implementation of bioprinting is still heavily restricted by the relatively narrow range of printable and biocompatible materials. Recently, many comprehensive reviews of the main bioprinting methods, commonly used bioprinting materials and the trending bioprinting applications have been carried out. In this review, we focused on the trends in the development of materials for 3D bioprinting. The significance and recent advances of ECM-based materials, multi-material and stimuli-responsive materials for bioprinting were summarized successively. Moreover, the challenges in current studies and future perspectives of materials for 3D bioprinting were discussed.     

正交试验优化手性镍催化不对称反应条件研究

用正交试验法优化手性镍催化二乙基锌对α，β不饱和酮的不对称麦克尔加成反应条件，优化后的不对称麦克尔加成反应的一般条件为：低温(近反应溶剂冰点)，常压，非质子非极性溶剂(环己烷)．     

Virtual Garment Sewing

Introduction3D garment CAD tools are increasingly required byclothing industries to assist the cloth design andmanufacturing process for quick response when faced withrapidly changing in style and fabrics with variable materialproperties. In the context of virtual prototyping, modelingand simulation of garment fitting to mannequin areattracting more and more people from both research andindustrial communities.Different approaches and techniques can be used…