菜单技术在通风机械试验数据处理计算机软件中的应用

着重对用Ｔｕｒｂｏ Ｃ语言编制的通风机空气动力性能试验数据处理计算机软件有关菜单技术的应用作一介绍。内容有主菜单的编制原理与键盘输入模块二级菜单的编制原理。     

微机变压器差动保护及其调试方法

通过对变压器差动保护原理分析,重点讲述了差动保护不平衡电流产生原因和微机保护处理方法,以及不同保护装置制造厂家在保护软件程序编制原理上的区别,介绍了利用试验仪手动和自动菜单进行变压器差动保护调试的方法和注意事项,提出了加电压模拟差动保护的设想,供同行的工作者参考。     

利用AutoCAD2000二次开发进行机床夹具设计

介绍了利用AutoCAD2000二次开发进行机床夹具的设计,建立了机床夹具图库,并采用AutoCAD2000的定制功能编制了机床夹具图调用的下拉式菜单和图像菜单,实现了200多种机床夹具图的图形调用.     

步进式控制器的程序设计

本文主要介绍用计算机编制步进式控制器的程序设计的方法和具体步骤。依照手工编制步进顺序控制器程序的步骤,通过交互菜单方式,用户可以很方便地得到一张程序控制二极管矩阵图。     

基于Auto CAD 2000 的轴孔类零件参数化图形的建立

介绍了在AutoCAD中应用Autolisp语言编制轴孔类零件参数化图形的过程，并开发了其结构的图像控件菜单，方便实用，从而提高了绘图效率。     

LabVIEW的事件驱动功能在菜单设计中的应用

介绍LabVIEW事件驱动功能，通过菜单设计叙述了LabVIEW的Event Structure即LabVIEW的事件编程能力，为编制各种人机交互界面提供了一种强有力的方法。     

基于UIDL与APDL语言的渐开线齿轮参数化建模

利用ANSYS的APDL语言与样条曲线功能编制齿轮的建模宏文件,通过UIDL语言在ANSYS中开发齿轮专用建模菜单,实现其参数化建模过程,从而为ANSYS的二次开发提供相关经验。     

基于AutoCAD的参数化造型设计

指出了参数化造型设计的基本原理，分析了参数化造型设计的实现方法，并编制了螺纹连接组件参数化设计的软件，创建了相应的菜单，设计了操作界面。     

基于UG NX平台上齿轮零件的计算机辅助设计

传统的齿轮零件设计比较繁琐,涉及很多计算公式,强度校核也比较困难。本文以UG NX为平台,开发了一种齿轮零件的计算机辅助设计方法。通过定制菜单和对程序的编制实现菜单、对话框和界面的二次开发。用户只需输入数据便可方便的完成齿轮的绘制和校核,无需进行大量复杂的计算,降低了设计难度,提高了工作效率。     

基于ObjectARX2000的公差自动查询和标注

介绍了公差自动查询的原理和方法,并给出公差查询流程图。在公差标注形式上采用了更为方便快捷的弹出式菜单和对话框形式。对弹出菜单的设计也作了介绍。文章还给出利用公差查询标注模块进行齿轮标注的应用实例。     

Micromorphology analysis and bond strength of two adhesives to Er,Cr:YSGG laser‐prepared vs. Bur‐prepared fluorosed enamel

Preservation of enamel during composite veneer restorations of fluorosed teeth could be achieved by conservative preparation with Erbium lasers. This study evaluated the effect of fluorosed enamel preparation with Er,Cr:YSGG vs. conventional diamond bur on the micromorphology and bond strength of a self‐etch and an etch‐and‐rinse adhesives. Er,Cr:YSGG laser or diamond bur preparation was performed on the flattened midbuccal surfaces of 70 extracted human premolars with moderate fluorosis (according to Thylstrup and Fejerskov index, TFI = 4–6). Adper Single Bond (SB) with acid etching for 20 or 40 s and Clearfil SE Bond (SEB) alone or with additional etching was applied in four laser groups. The same adhesive procedures were used in three bur groups except for 40 s of etching along with SB. After restoration, microshear bond strength was measured (MPa). Data were analyzed using ANOVA and Tamhane tests (α = 0.05). Six additional specimens were differently prepared and conditioned for scanning electron microscopy evaluation. The highest and lowest bond strengths were obtained for bur‐prepared/SB (39.5) and laser‐prepared/SEB (16.9), respectively, with a significant difference (P = 0.001). The different adhesive procedures used associated to two adhesives exhibited insignificantly lower bonding in laser‐prepared groups compared to bur‐prepared ones (P > 0.05), with the exception of additional etching/SEB, which bonded significantly higher to bur‐prepared (36.4) than to laser‐prepared enamel (18.7, P = 0.04). Morphological analyses revealed a delicate etch pattern with exposed enamel prisms on laser‐prepared fluorosed enamel after acid etching and less microretentive pattern after self‐etching primer. The etch‐and‐rinse adhesive was preferred in the laser‐prepared fluorosed enamel in terms of bonding performance. Microsc. Res. Tech. 77:779–784, 2014. © 2014 Wiley Periodicals, Inc.     

The Preparation of Some Phosphorus Compounds and Their Comparison as Load Carrying Additives by the Four-Ball Machine

In this work, a variety of phosphonate esters, N-alkyl ammonium alkyl hydrogen phosphites, and a few phosphinates have been prepared. The compounds prepared were tested as extreme pressure additives at equimolar concentration in mineral oil by the Four-Ball Machine. The ammonium alkyl hydrogen phosphites showed unusual effectiveness in raising the initial seizure load.

A few of the compounds prepared were also tested for antiwear activity.     

Transmission electron microscopy of fluorapatite–gelatine composite particles prepared using focused ion beam milling

In this paper, synthetic fluorapatite–gelatine composite particles are prepared for transmission electron microscopy (TEM) studies using two methods based on focused ion beam (FIB) milling. TEM studies on the FIB‐prepared specimens are compared with TEM observations on samples prepared using an ultramicrotome. The results show that ultramicrotome slicing causes significant cracking of the apatite, whereas the ion beam can be used to make high‐quality, crack‐free specimens with no apparent ion beam‐induced damage. The TEM observations on the FIB‐prepared samples confirm that the fluorapatite composite particles are composed of elongated, preferentially orientated grains and reveal that the grain boundaries contain many small interstices filled with an amorphous phase.     

An assessment of beeswax as a thickener for environmentally friendly lubricating grease production

Environmentally friendly lubricants are preferred in many applications where groundwater or soil pollution is possible. The main purpose of the current study was to evaluate the possibility of beeswax use as a thickener for lubricating greases. European beeswax was used as a thickening material for the preparation of lubricating greases. Rapeseed oil and two mineral oils were used as base oils. The consistency, dropping point temperature, and tribological properties of the prepared lubricating greases were investigated and compared with conventional soap‐thickened greases. The prepared greases exhibited good tribological properties, especially the rapeseed‐oil‐based grease. However, tribological properties of conventional lubricating grease were superior to prepared ones. The weakness of the prepared lubricating greases is their narrow working temperature range. However, the beeswax together with rapeseed oil has great potential in the production of environmentally friendly, completely renewable lubricating greases. Copyright © 2014 John Wiley & Sons, Ltd.     

Elemental concentrations in isolated rat thymocytes prepared for cryofixation in the presence of different media

Rat thymocytes were isolated in suspension and the effect of preparing the cells for cryofixation in the presence of different media on the elemental content was investigated using the technique of X-ray microanalysis. Cells prepared in the different media showed variation in the concentrations of Na, K and Cl. The isolated cells were incubated at 310 K for 1 h to allow recovery from isolation. There was a decrease in Na and Cl content after incubation. The thymocyte population was disturbed by suspension in medium containing dextran, and this resulted in a number of cells with high concentrations of Na and low concentrations of K. These cells did not take up vital dye. Thymocytes were also prepared for freezing by using high-speed centrifugation to concentrate the cells. Thymocytes prepared by this method showed values for concentrations of Na, K and Cl similar to published values for these cells using other methods of estimation. There were, however, consistent differences in Na content between the cells prepared in Hanks' balanced salt solution and those prepared in serum. Factors which affect the apparent concentration of Na and Cl in isolated cells are discussed.     

推拉式小车法制备单层硒化钨薄膜

为了提升单层硒化钨（WSe₂）薄膜的制备质量，在传统化学气相沉积（CVD）法制备的基础上进行改进，通过引入推拉式小车来制备单层WSe₂薄膜，从而构造出可以调控沉积区域、精确控制生长时间，并可实现快速降温的生长方式。采用光学显微镜和原子力显微镜来表征制备材料的尺寸、荧光强度、形貌结构等特性，证明了利用推拉式小车法可成功制备出高质量的单层WSe₂薄膜。推拉式小车法可以稳定制备大面积、高质量、单层的WSe₂薄膜，为其在信息、能源、生物等前沿领域的应用提供参考。     

A method for the preparation of cerebral blood vessels

Elements of the cerebral vascular system of the rat have been prepared by simultaneous perfusion with fibrinogen and thrombin. The resulting fibrin fills and serves to support the vessels which can then easily be excised from the brain and prepared for light and electron microscopy. The structure and ultrastructure of cerebral blood vessels is well preserved by this technique.     

Use of surface affinity enrichment and cryo-embedding to prepare in vitro reconstituted mitotic chromosomes for EM tomography

We present a novel preparation method for studies of in vitro reconstituted mitotic chromosomes from Xenopus laevis egg extracts. This method involves a gentle adsorption of chromosomes from the extracts using surface affinity enrichment, followed by plunge freezing, freeze-substitution and cryo-embedding before examination by EM tomography. For comparison, chromosomes were also prepared by a conventional method, which included immobilization of chromosomes in agarose and a room-temperature dehydration/embedding protocol. Three-dimensional reconstructions showed that samples prepared with the new method have a greater interconnectivity of sub-structural features and a higher compaction ratio together with an apparently less perturbed chromatin structure than those prepared using the conventional approach. The implications of the new method for the preparation of other difficult samples and additional application possibilities are discussed.     

Image spread in dry-mounted tritium autoradiographs

A comparison has been made of autoradiographs prepared by conventional dipping methods and those prepared from the same material using a dry-mounting method developed for the study of receptor labelling. Resolution was found to be inferior, and image spread greater, in the dry-mounted preparations. The extent to which resolution and image spread were affected depended upon the distance between specimen and emulsion.     

原位红外光谱法研究聚碳酸酯的热稳定性和分解机理

采用原位红外光谱法研究PC的热稳定性。实验表明:同为光气法制备的PC,G—1比G—2热分解温度高;同为酯交换法生产PC,Z-1比Z-2热分解温度高。PC在升温过程中,首先断裂的是酯基中醚键,在较高温度,发生异丙基断裂,400℃后,主链才断裂。