基于SSH2框架的Web应用

本文给出了SSH2框架的设计原理和实现,即如何借助Struts2、Spring3、Hibernate3以及Ajax技术实现Web应用。文中先给出了整体框架的优势,并按照MVC模式对每层分别进行详细说明,最后以高校科研管理系统设计与实现为例,对整合的架构应用进行具体地实现。结果表明,整个系统具有平台无关性,并提高了应用系统的灵活性、可维护性、可扩展性、可移植性和组件的可复用性。     

Effect of pretreatment on surface topographical features of vegetables during drying

It is well recognized that many adverse changes occur to a food product during drying. Various pretreatment methods have thus been introduced to maintain the quality of the product. Among the various qualities, or properties, of a food product surface characteristics are one of the most important as these affect directly the consumer acceptance of the product. In terms of food safety surface characteristics may also be related to the attachment and hence thermal resistance of pathogenic microorganisms on the product surface. In this study attempt was made to investigate changes of the surface topographical features of vegetables as affected by pretreatment (blanching in hot water or soaking in 0.5-1.5% v/v acetic acid solution) and hot air drying (60 °C); cabbage and spring onion were selected as model vegetables to represent different natural topographical features of vegetables. An image analysis technique was used to monitor the changes of vegetable surfaces after pretreatment and during drying. The surface characteristic changes of vegetables were described quantitatively in terms of the relative roughness factor (R). It was observed that the surface characteristic changes, as affected by both pretreatment and drying processes, could be well monitored by the evolution of the R value.     

The joint effect of shape and size of reinforcement on progressive damage of random composites

The properties of composites made by placing inclusions in a matrix are often controlled by the shape and size of the particles. In order to study the joint effect of shape and size of inclusions, we characterize the random shape of particles in composite mathematically by applying Fourier series, then generating random mesostructure of composite for cases of inclusions with (1) same size and different shape, (2) different size and same shape, or (3) random size and shape. Crack paths and effective stress–strain curves of these cases are predicted using spring network method which is given in detail. The study shows we need more elaborate statistical evaluation due to the random nature of composites. This paper outlines an approach to study effect of inclusion geometry on the elastic properties and crack of random composites.     

真空断路器弹簧操动机构优化理论分析

本文论述了真空断路器所使用的弹簧操动机构的优化方法，提出对每种断路器皆需要一种动力与之相配合的操动机构，且在１１０ｋＶ真空断路器负载特性给定条件下对传动杆件进行了优化设计分析。     

对碟形弹簧结构要素的探讨

本文通过对碟形弹簧结构要素的探讨，分析讨论碟簧刚度为零的条件及碟簧各结构参数对其性能的影响。阐述并归纳出普通或特定条件下碟簧设计的实用规律。     

Application of Programmable Logic Controller in Hydraulic Spring Eye Machine

A programmable logic controller is used in the automatic control system of hydraulic spring eye machine to realize the automation of the production process. The control system of spring eye machine consists of electricity and liquid. Push-button and sensor control outputs control the opening or shutting of all hydraulic valves to realize automatic movements of the machine. Two pressure sensors measure the pressure on the oil passage of the hydraulic, which guarantees more steady oil pressure to realize normal movements of the machine, and the security of the equipment and workers at the same time. In addition, indicator lamp of operating panel is convenient to notify workers to fetch production at the end of spring eye and find out the reason of the fault. The result indicates that the control system of the pro,grammable logic controller can improve production efficiency greatly.     

安全阀弹簧失效原因分析与改进措施

弹簧式安全阀是用于催化装置上的重要部件，在常温下露点腐蚀是弹簧式安全阀失效的重要原因。针对大连石化公司二催化装置T302解吸塔塔顶安全阀的失效，利用电子能谱（EDX）、SEM电镜扫描等手段对失效安全阀弹簧进行检测分析，得出安全阀弹簧失效的主要原因是安全阀接触的介质舍有H2S、SO2、H2O，这些介质在30—40℃，常压的务件下在安全阀弹簧的表面形成酸性露点而腐蚀表面形成点蚀坑，这些点蚀坑引起应力集中导致弹簧断裂，并针对具体情况提出解决方案。     

Calibration of AFM cantilever stiffness: a microfabricated array of reflective springs

Calibration of the spring constant of atomic force microscope (AFM) cantilevers is necessary for the measurement of nanonewton and piconewton forces, which are critical to analytical applications of AFM in the analysis of polymer surfaces, biological structures and organic molecules.

We have developed a compact and easy-to-use reference standard for this calibration. The new artifact consists of an array of 12 dual spiral-cantilever springs, each supporting a mirrored polycrystalline silicon disc of 160 μm in diameter. These devices were fabricated by a three-layer polysilicon surface micromachining method, including a reflective layer of gold on chromium. We call such an array a Microfabricated Array of Reference Springs (MARS). These devices have a number of advantages. Cantilever calibration using this device is straightforward and rapid. The devices have very small inertia, and are therefore resistant to shock and vibration. This means they need no careful treatment except reasonably clean laboratory conditions.

The array spans the range of spring constant from around 0.16 to 11 N/m important in AFM, allowing almost all contact-mode AFM cantilevers to be calibrated easily and rapidly. Each device incorporates its own discrete gold mirror to improve reflectivity. The incorporation of a gold mirror both simplifies calibration of the devices themselves (via Doppler velocimetry) and allows interferometric calibration of the AFM z-axis using the apparent periodicity in the force–distance curve before contact. Therefore, from a single force–distance curve, taking about one second to acquire, one can calibrate the cantilever spring constant and, optionally, the z-axis scale. These are all the data one needs to make accurate and reliable force measurements.     

基于W+S+H经销商管理系统的设计与实现

在中国市场中,经销商对企业扩展市场起着至关重要的作用.随着经销商的数量的日益增长,经销商的管理成为了企业面临的一项难题.本文采用目前流行的J2EE架构WebWork、Spring和Hibernate框架实现了经销商管理系统.WebWork是一个基于MVC设计模式的框架,用于实现该系统的表示层;Spring是一个AOP框架和IoC容器,用于实现该系统的业务层;Hibernate是一种先进的O/R映射工具,用于实现该系统的持久层.本文以经销商管理系统的开发为例,重点介绍了WebWork、Spring和Hibernate框架的配置使用.     

GH90高温合金弹簧丝材的试制

GH90高温舍金弹簧钢丝采用固溶再经表面酸洗皮膜处理进行单道次大压缩率冷拉的生产工艺，可获得高强度、一定的韧性，一定的抗弯曲扭转能力，其产品满足质量要求。本文探讨了GH90舍金弹簧钢丝的固溶处理、表面处理以及拉拔变形量和拉拔工艺。