商洛钒尾矿烧制轻质高强陶粒的研究

采用80wt;商洛钒尾矿为主要原料,加入钾长石、粘土为辅助原料,以SiC为发泡剂,制备性能优异的轻质高强陶瓷颗粒.采用单因素变量分析法研究钒尾矿含量、SiC添加量、烧成温度和保温时间对陶粒结构及性能的影响.研究结果表明:随着发泡剂SiC含量的增加、烧成温度的提高和保温时间的延长,陶粒的堆积密度和筒压强度均降低,吸水率均升高.最终加入2wt;SiC为发泡剂,在1125℃下保温30min制得堆积密度631kg/m3,筒压强度9.1MPa,吸水率3.1;的轻质高强陶瓷颗粒.     

剪切散斑中新的相移技术及其在泵体上的应用研究

本文实现了一种新的剪切散斑干涉技术的载波方法.其特点是通过移动剪切棱镜,而产生载波条纹来调制变形条纹.然后,利用傅立叶变换法解调出变形条纹,获得全场位相图.本文介绍了这种载波相移技术的原理,并且对该载波技术的原理进行了推导.最后将该方法运用到舰用主泵体的离面位移导数(应变)测量上.     

Combine Harvester Bearing Fault-Diagnosis Method Based on SDAE-RCmvMSE

In the fault monitoring of rolling bearings, there is always loud noise, leading to poor signal stationariness. How to accurately and efficiently identify the fault type of rolling bearings is a challenge. Based on multivariate multiscale sample entropy (mvMSE), this paper introduces the refined composite mvMSE (RCmvMSE) into the fault extraction of the rolling bearing. A rolling bearing fault-diagnosis method based on stacked auto encoder and RCmvMSE (SDAE-RCmvMSE) is proposed. In the actual environment, the fault-diagnosis method use the multichannel vibration signals of the bearing as the input of stacked denoising autoencoders (SDAEs) to filter the noise of the vibration signals. The features of denoise signals are extracted by RCmvMSE and the rolling bearing operation-state diagnosis is completed with a support-vector machine (SVM) model. The results show that in the original test data, the accuracy rates of SDAE-RCmvMSE, RCmvMSE, and commonplace features of vibration signals combined with SVM (CFVS-SVM) methods are 99.5%, 100%, and 96% respectively. In the data with noise, the accuracy rates of RCmvMSE and CFVS-SVM are 97.75% and 93.08%, respectively, but the accuracy of SDAE-RCmvMSE is still 100%.     

Reactions of late lanthanide metal atoms with water molecules: a matrix isolation infrared spectroscopic and theoretical study

The reactions of late lanthanide metal atoms (Gd-Lu) with water molecules have been investigated using matrix isolation infrared spectroscopy. The reaction intermediates and products were identified on the basis of isotopic substitution experiments and density functional theory calculations. All of the metal atoms except Lu react with water to form the M(H2O) complexes spontaneously upon annealing (M = Gd, Tb, Dy, Ho, Er, Tm, and Yb). The Dy(H2O) and Ho(H2O) complexes are able to coordinate a second water molecule to form the Dy(H2O)2 and Ho(H2O)2 complexes. The M(H2O) complexes isomerize to the inserted HMOH isomers under visible light irradiation, which further decompose to give the MO and/or HMO molecules upon UV light irradiation. The M(OH)2 molecules (M = Gd-Lu) were also produced. The results have been compared with our earlier work covering the early lanthanide metal atoms (Nd, Sm, Eu) to observe the existent trends for the lanthanide metal atom reactions.     

多波长线性回归法测定脑宁片的含量

本文采用多波长线性回归法测定脑宁片的含量。计算程序采用BASIC语言编制。氨基比林和咖啡因的回收率和相对标准偏差分别为98.03%-100.9%,1.0%-和97.77%-99.39%,0.61%。本法不经分离直接测定脑宁片中二组分的含量,方法简便、快速、结果满意。     

Preparation of a novel carboxyl stationary phase by “thiol‐ene” click chemistry for hydrophilic interaction chromatography

A novel carboxyl‐bonded silica stationary phase was prepared by “thiol‐ene” click chemistry. The resultant Thiol‐Click‐COOH phase was evaluated under hydrophilic interaction liquid chromatography (HILIC) mobile phase conditions. A comparison of the chromatographic performance of Thiol‐Click‐COOH and pure silica columns was performed according to the retention behaviors of analytes and the charged state of the stationary phases. The results indicated that the newly developed Thiol‐Click‐COOH column has a higher surface charge and stronger hydrophilicity than the pure silica column. Furthermore, the chromatographic behaviors of five nucleosides on the Thiol‐Click‐COOH phase were investigated in detail. Finally, a good separation of 13 nucleosides and bases, and four water‐soluble vitamins was achieved.     

Link between adatom resonances and the Cu(111) Shockley surface state

Low-temperature scanning tunneling microscopy and spectroscopy at 7 K was used to assemble and characterize native adatom islands of successive size on the Cu(111) surface. Starting from the single adatom we observe the formation of a series of quantum states which merge into the well known two-dimensional Shockley surface state in the limit of large islands. Our experiments reveal a natural physical link between this fundamental surface property and the sp(z) hybrid resonance associated with the single Cu/Cu(111) adatom.     

Rhodium(III)‐Catalyzed Asymmetric Access to Spirocycles through C−H Activation and Axial‐to‐Central Chirality Transfer

Axial‐to‐central chirality transfer is an important strategy to construct chiral centers, where the axially chiral reagents are mostly limited to atropomerically stable ones. Reported herein is a Rh^III‐catalyzed enantioselective spiroannulative synthesis of nitrones. The coupling proceeds via C?H arylation to give an atropomerically metastable biaryl, followed by intramolecular dearomative trapping under oxidative conditions with high degree of chirality transfer.     

溶胶凝胶法制备纳米LiCoO2

纳米微粒;放电初容量;循环稳定性;溶胶凝胶法制备纳米LiCoO2     

Three—dimensional modelling of the flow and heat transfer in a laminar non—transferred arc plasma torch

By experimental observation we show that the plasma flow and heat transfer within a direct current (DC) nontransferred arc plasma torch always show appreciable three-dimensional (3D) peculiarity even when the geometrical construction of the torch and working gas admission and external electrical collection conditions are completely axisymmetrical.Previous two-dimensional (2D) modelling studies cannot predict the 3D peculiarity of the plasma torch.We have successfully performed 3D modelling,and in this paper we present the modelling results for the plasma flow and heat transfer characteristics in a laminar DC non-transferred are argon plasma torch.The predicted arc-root location on the surface of the torch anode and arc voltage compare favourably with the corresponding experimental results.