影响加筋土挡墙地震稳定性的参数分析

针对现有挡土墙抗震设计影响因素考虑不足等问题,运用拟静力法和水平条分法分析加筋土挡墙的地震稳定性,并研究土体内摩擦角、水平地震力加速度系数、填土粘聚力、挡土墙倾角和滑动体上部荷载等参数对地震稳定性的影响。结果表明:加筋土挡墙的地震稳定性与水平地震力加速度系数和滑动体上部荷载有显著关系,且变化趋势与之成正比;与土体内摩擦角和填土粘聚力的变化趋势成反比;当条件相同时,倾斜加筋土挡墙的地震稳定性比竖直挡墙的稳定性好。     

学籍信息系统软件体系结构设计

分析了软件体系结构的几个难点,提出了将功能代码分别放在业务逻辑层与数据层的思路,并结合学籍信息系统体系结构参考模型,解决了综合结构设计中的一些关键技术。     

基于知识网格的学科门户系统设计

该文首先分析了当前学科信息门户建设中存在的问题,针对这些问题提出了基于学科信息网站、知识网格节点和虚拟知识网格服务社区三级结构模型,建立自动实现学科知识获取、检索和共享的运作机制,设计了基于知识网格的学科门户系统结构。     

基于SIP视频会议系统设计

采用SIP协议,对视频会议系统的服务器端和客户端进行了系统设计,并对各个模块的功能进行了详细的说明。     

基于亚龙235PLC的酒加工控制系统的研究

自本文以亚龙235 PLC实验装置为基础,研究了酒加工的工业控制过程,从硬件和软件2方面来进行阐述,并简单设计了用触摸屏来控制加工过程,适用于职业学校PLC课程的拓展应用。     

The development of semiconductor-ionic conductor composite electrolytes for fuel cells with symmetrical electrodes

Lowering the operational temperature of solid oxide fuel cells (SOFCs) is a vital research challenge for achieving broad commercialization of SOFCs. However, there is currently a lack of suitable electrolyte materials with sufficient ionic conductivity. In this review, the recent progress in semiconductor-ionic conductor composite strategies and related key technologies for low temperature SOFCs (LT-SOFCs) applications is highlighted, in particular, emphasizing the demonstration of such composite materials sandwiched between semiconductor electrodes in a symmetrical configuration that has delivered a potent solution. Despite the co-existence of electronic and ionic conduction in the composite membrane, no electronic short-circuiting was displayed, but rather an enhanced device power output was achieved. Here, the recent progresses in the development of SOFCs, from single-layer fuel cells, to two-phase semiconductor-ionic conductor membrane fuel cells with symmetrical electrodes, are discussed. This review will furnish researchers within the SOFC community and beyond with a broader understanding of the theory, development and significance of composite materials for LT-SOFCs.     

高职实践类课程教学改革探索与实践

数字化制造时代如何培养制造业转型所需的复合型一线人才,是高职院校亟待探索并解决的问题。以"典型零件数控铣削工艺与编程"课程为例,研究项目教学法,基于数字化制造流程"行动导向"在课程教学内容、教学模式改革中的应用,探索并实践提高学生数字化制造职业岗位能力和职业素养的新途径,为数字化制造模式下高职实践课程教学改革提供借鉴。     

电场对竖直微槽润湿及毛细流动特性影响

竖直微槽群毛细结构广泛应用在重力热管、蒸发器等散热设备内,但受重力等因素影响易达到毛细极限。引入电场的主动强化方式来提高竖直微槽的毛细极限,并通过实验和建立数学模型研究电场对竖直微槽内液体润湿及毛细流动特性的影响。结果表明,电场可以提高竖直微槽内液体润湿高度,当电场为5.0 kV时与无电场时相比,润湿高度强化比可达到30.0%。同时,电场作用下流体在微槽道内的毛细润湿流动呈分段效应：润湿流动初期,润湿高度与时间的1/2次方呈线性关系,即h-t^1/2,润湿速率与润湿高度的倒数呈线性关系,即v-1/h;润湿流动中后期,润湿高度与时间的1/3次方呈线性关系,即h-t^1/3,润湿速率与润湿高度平方的倒数呈线性关系,即v-1/h²,且润湿速率随时间呈下降趋势。     

VFP通用字段中的信息导入SQL Server的实现方法

综合应用VFP、VB及ADO技术,实现了在VFP通用字段的信息中导入SQL Server数据库image字段,有效地解决了VFP数据库升迁到SQL Server上、通用（Gen）字段转为image字段后无法读取的问题。     

Novel carbon-ceramic composite membranes with high cation exchange properties for use in microbial fuel cell and electricity generation

Actually, there are different configurations used in microbial fuel cells (MFCs) with presence or absence of an ion exchange membrane between their electrodes. Specifically, MFCs that use membranes have the objective of avoiding the diffusion of oxygen and substrate between the anodic and cathodic compartment, and to achieve a correct transfer of protons from one chamber to another. In this regard, the current study seeks to prepare and characterize new composite membranes using as precursors three types of carbonaceous materials such as bone char, coconut shell activated carbon and bituminous activated carbon and natural clay. The composite membranes of bituminous activated carbon and clay showed more promising specific conductivity (42%) than the one made with pure clay. The physicochemical properties of the membranes and their precursors were elucidated by SEM/EDX analysis, IR spectroscopy, nitrogen adsorption isotherms at 77 K and optical microscopy. Further, membranes performance was assessed using microbial fuel cells (MFCs) where the composite membranes prepared with clay-bituminous carbon reached the highest voltage values (0.95–1.02 V) in open circuits, while that reached a maximum power density of 0.699 W/m³ at a current density of 4.012 A/m³ in closed circuit. This behavior is associated with the high content of silicon and aluminum in bituminous activated carbon, which favored the proper functioning of membranes in the MFCs. Specifically, with this type of cells, energy recovery of 0.0057 kWh/m³ and 0.1322 kWh/kg chemical oxygen demand (COD) removed, which indicates an extra economic income of the order of $0.0025/kg COD. Finally, the produced power was demonstrated in prototypes to power LED and four digital clocks. This novel clay-bituminous activated carbon showed promising cost-effectiveness and sustainable energy generation, which may be suitable for wastewater treatment.