基于GE300变频恒压供水控制系统改造设计

某生活小区原供水系统依靠阀门实现水量控制,水泵在额定状态下运行,机械磨损较大,使用成本高。通过采用GE300和变频器组合的控制系统改造,完成系统的软硬件设计及参数设置,能自动控制水泵投入的台数和电机转速,达到恒压供水目的。运行结果表明,该系统具有压力恒定,机械损耗小,节能效果显著等优点。     

基于 P300 与 ErrP 决策融合的脑-机接口目标检测方法

针对脑-机接口(BCI)技术在目标检测中的应用仍然存在检测准确率受限的问题,提出基于事件相关电位(ERP)中的 P300 与错误相关电位(ErrP)决策融合的新型编解码方法。 BCI 系统编码方面通过目标图像和视觉反馈分别诱发 P300 与 ErrP 特征,解码方面采用单独 P300 特征、单独 ErrP 特征、P300 与 ErrP 特征层融合、P300 与 ErrP 决策层融合这 4 种方案进行目标检 测。 10 名健康受试者 4 种方案进行目标检测的平均结果显示,使用 P300 与 ErrP 决策层融合的平衡正确率最高,达到 80. 03%± 5. 20%,相比单独使用 P300 特征的方法提升了 4. 38%,相比单独使用 ErrP 特征的方法提升了 11. 29%,验证了混合 BCI 技术在 目标检测任务中的可行性。     

Fertigung einer universellen Hüftprothesenpfanne mittels Hochdruckblechumformung

In recent years, the use of hip prostheses has become a routine procedure. The use of total hip replacement has evolved in recent years to a routine procedure. Despite this experience, it always comes back to complications. Especially the migration or loosening of the acetabular component because of the artificial load adaptive bone remodeling is still a current problem. This is due to the changing mechanical situation after the implantation of the prosthesis. Another problem is the high bone loss during implantation, which complicates a revision of the prosthesis. One solution is the use of patient‐specific prostheses. So far, the use of these prostheses is limited due to the time‐consuming and cost‐intensive production. The overall objective of the presented project in this publication is the development and establishment of an innovative concept for the production of patient‐specific hip prosthesis made of titanium plates by sheet metal forming. The idea of this concept involves the development of a two‐stage process. First of all a standardized hip prosthesis is made by high‐pressure sheet metal forming and then individually in the second step. This publication contains the derivation of the standard prosthesis. For this purpose, a design methodology was generated, based on the so‐called agglomerative clustering. In addition, presents the results of the numerical preliminary design of the first stage of the process and the tool developed concept in the course of this paper.     

LASER 300S在线激光打孔参数的选择

通过对PROTOS1-8高速卷烟机在线激光打孔参数的组合试验和数据回归分析,得出了烟支稀释率与脉冲、脉冲与能量的乘积、能量、打孔数量等参数的线性相关方程。试验结果表明,利用各线性方程可计算出能保证LASER 300S激光打孔系统正常运行的参数组合,与实际在线打孔的烟支稀释率值具有较好的符合性和稳定性,能够提高在线加工质量。     

Electrochemical corrosion behavior of 300M ultra high strength steel in chloride containing environment

The electrochemical corrosion behavior of 300M ultra high strength steel in chloride containing environment was investigated by potentiodynamic polarization technique, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). The results show that uniform corrosion occurs on 300M steel during the electrochemical measurements because no anodic passivation phenomenon is observed on polarization curves within the measurement range. The tests also show that 300M steel is highly susceptible to chloride containing solution, which is characterized by corrosion current density increasing with the addition of chlorides, and corrosion potential shifting towards positive direction and corrosion resistance decreasing, positively suggesting that chloride ions speed up the corrosion rate of 300M steel. Meanwhile corrosion products on the 300M steel surface formed during the salt spray test are too loose and porous to effectively slow down the corrosion rate. Additionally, a schematic structure of uniform corrosion mechanism can explain that 300M steel has better property of stress corrosion cracking (SCC) resistance than stainless steels.     

The P300 as an electrophysiological probe of alcohol expectancy.

Language-based measures indicate that alcohol expectancies influence alcohol consumption. To relate these measures to brain actions that precede verbal output, the P300 component of the Event-related potentials (ERPs) was used to detect violations of individually held alcohol expectancies. As predicted, P300 amplitude elicited by negative alcohol expectancy stimuli was positively correlated with endorsement of positive/arousing alcohol expectancies on the language-based measures, such that the higher an individual's positive/arousing expectancies, the larger was the P300 elicited by negative alcohol expectancy stimuli. These results demonstrated concordance between language-based measures of alcohol expectancies and electrophysiological probes of expectancy. While it remains unknown whether these expectancy processes are integral to decision pathways that influence consumption, these findings suggest that such processing can occur very quickly outside of conscious deliberation. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

板料成形过程有限元模拟中的接触处理

对板料成形过程进行有限元模拟时，为了取得可靠的计算结果，需要准确地描述模具与板料之间的动态接触状态．在全面分析成形中板料与模具接触边界动态变化的基础上，结合ABAQUS有限元分析软件给出了模型的几何描述、接触算法选择及应用VFRIC用户子程序进行接触摩擦模型的建立等具体方法．通过具体实例，证明了这些方法应用于板料成形过程的接触分析的可行性．     

E-300与MOCA扩链聚氨酯弹性体的力学性能比较

以聚酯(PEA、PEPA、PCL)或聚醚(PTMG、PPG、PO/PT)和TDI为原料合成聚氨酯(PU)预聚体,分别用MOCA和E-300作扩链剂制备聚氨酯弹性体。比较了这2种扩链剂对PU弹性体力学性能的影响。实验结果表明:MOCA-PU的硬度、模量和强度均大于E-300-PU,E-300-PU的扯断伸长率略高于MOCA-PU。在相同硬度下的聚醚型PU弹性体,E-300-PU比MOCA-PU的撕裂强度高。     

关于300D/32F扁平丝FDY工艺条件探讨

现在市场上的同质化产品太多,多样化面料价格居高不下,为满足客户需求和改善行业竞争模式,对涤纶扁平300 D/32 F工艺讨论.在生产中不断调整工艺参数,检测产品品质.通过优化工艺可以稳定生产出AA率高的异形扁平FDY 300D/32F全消光丝.     

高压大容量发电机定子线圈槽部电场的数值分析

采用有限单元法，编制了适用于微机系统的槽部电场计算专用软件，计算了大型发电机定子线圈槽部电场的分布，软件通用性强，使用简便。利用线性回归方法，求出了定子线圈槽部最大场强与导线圆角半径和绝缘厚度的关系。为大型发电机绝缘结构优化设计提供了理论依据。