基于Pro/E-PDX的焊片连续模设计

介绍了基于Pro/E软件的"连续模设计系统Progressive Die Extension (PDX)"的应用。并结合实例说明了利用PDX设计冲压连续模的过程及方法。     

3D打印模型切片及路径规划研究综述

3D打印包括建模、分层切片、路径规划及打印等过程.对3D打印中三维模型数据处理技术核心——切片和路径规划进行综述.介绍3D打印切片软件中针对单材料不同格式的模型切片处理方法,阐明了3D打印中的不同工艺参数影响下的切片算法,包括各类分层切片算法和扫描填充算法,说明每种算法的优缺点,并对现有的单相均质模型切片算法进行对比分...     

接地电容电流的实测及补偿

介绍了如何实测接地电容电流及进行补偿．     

基于钴改性的钙基吸附剂污泥富氢气化

基于钙基吸附剂的污泥蒸汽气化制取富氢合成气是一种高效环保的污泥处理方式。本文采用溶胶-凝胶法制备了Co改性、Al₂O₃为载体的钙基吸附剂。借助热重分析仪测定不同钙基吸附剂在多个碳酸化和煅烧循环中的CO₂吸附能力和循环稳定性,并在固定床上进行污泥蒸汽气化实验。结果显示：煅烧过程中,以Al₂O₃为载体的钙基吸附剂中的Al₂O₃与CaO生成七铝酸十二钙(Ca₁₂Al₁₄O₃₃),并表现出优异的孔隙结构的和CO₂吸附能力,其中,Co质量分数为10%的吸附剂在30次循环（700℃碳酸化35min,850℃煅烧5min）中碳酸化率稳定在70%左右;提高气化温度及Co的添加量可促进焦油裂解和甲烷重整反应,显著提高了合成气中H₂的浓度和产量及污泥气化的冷煤气效率,有利于富氢气体的制取;在650℃下,相比于纯CaO,添加Co质量分数为15%的吸附剂时,H₂产量提高了102%,H₂体积分数提高到85%。     

Route tracking for self-propelled ship model

Multimedia Tools and Applications - To ensure the safety of the navigation, self-propelled ship model test is widely used in navigable administer engineering to visually and really reflect...     

基于包络原理平面移动凸轮机构的研究

以包络原理为基础 ,对直动滚子从动件和摆动滚子从动件两种形式的平面移动凸轮机构进行研究 ,分析并推导其廓线方程、压力角及曲率计算公式 ,给出应用实例。     

Single Atom Array Mimic on Ultrathin MOF Nanosheets Boosts the Safety and Life of Lithium–Sulfur Batteries

The development of Li–S batteries is largely impeded by the growth of Li dendrites and polysulfide shuttling. To solve these two problems simultaneously, herein the study reports a “single atom array mimic” on ultrathin metal organic framework (MOF) nanosheet-based bifunctional separator for achieving the highly safe and long life Li–S batteries. In the designed separator, the periodically arranged cobalt atoms coordinated with oxygen atoms (Co O₄ moieties) exposed on the surface of ultrathin MOF nanosheets, “single atom array mimic”, can greatly homogenize Li ion flux through the strong Li ion adsorption with O atoms at the interface between anode and separator, leading to stable Li striping/plating. Meantime, at the cathode side, the Co single atom array mimic serves as “traps” to suppress polysulfide shuttling by Lewis acid-base interaction. As a result, the Li–S coin cells with the bifunctional separator exhibit a long cycle life with an ultralow capacity decay of 0.07% per cycle over 600 cycles. Even with a high sulfur loading of 7.8 mg cm⁻², an areal capacity of 5.0 mAh cm⁻² can be remained after 200 cycles. Moreover, the assembled Li–S pouch cell displays stable cycling performance under various bending angles, demonstrating the potential for practical applications.     

Selective Degradation of PD-L1 in Cancer Cells by Enzyme-Instructed Self-Assembly

Here, a novel strategy to selectively degrade membrane proteins of programmed cell death-ligand 1 (PD-L1) in cancer cells is reported. 4T1 cells show high levels of extracellular alkaline phosphatase (ALP) and membrane proteins of PD-L1. Therefore, peptide derivatives capable of responding to ALP and binding to PD-L1 are designed. Enzyme-instructed self-assembly (EISA) by ALP and surface-induced self-assembly by PD-L1 of Comp. 3 leads to the selective formation of nanomaterials around PD-L1 on the cell membrane, which is similar to attaching a hydrophobic label to the surface of PD-L1 to simulate its partial denaturation state. When taken up by cells, PD-L1 could be further degraded by the proteasome pathway in the cytoplasm. This process does not occur in the normal cell line, LO2 cells, which express relatively low levels of ALP. In addition to concentration and time dependence, the selective knock-out of PD-L1 by the strategy is reversible by simply removing Comp. 3 . In vivo studies reveal that Comp. 3 inhibits tumor growth in a tumor-bearing mouse model. The study offers a novel platform for the precise degradation of membrane proteins using EISA, which might ultimately lead to the development of novel nanomedicines to treat diseases.     

压电能量采集器高效能量提取接口电路设计

压电能量采集器能把环境振动能转换为电能,该文基于如何将压电能量采集器转化电能最大化提取的研究,提出了一种压电能量采集器高效能量提取接口电路,采用有源二极管整流电路降低了整流过程中的导通压降损耗,电感同步开关电荷提取电路有效提取了寄生电容中储存的电能。利用华虹宏力0.11 μm CMOS工艺进行电路设计和版图布局。测试结果表明,接口电路可提取80.4%寄生电容中存储的电能,20 kΩ电阻负载下导通压降为20.2 mV,在加速度5g(g=9.8 m/s2)和频率40 Hz条件下平均提取功率是标准接口电路的2.58倍。该芯片可应用于基于振动能供电的无线无源传感节点等领域。     

基于残差和高频替换的SONY-RGBW阵列彩色重构方法

RGBW滤光阵列常被用于提升探测器在低照度下的成像质量,但相应的彩色重构方法依然是结合拜尔阵列特点设计的,未充分利用亮度信息的优势,故重构结果较差.针对这一缺陷,首先,使用引导滤波挖掘亮度信息和彩色信息的关联性.然后,根据残差的平滑性,设计了适用于SONY-RGBW滤光阵列空域特点的采样率逐步提升的多步残差插值算法.接着,为改进算法边缘适应性,结合在正交方向上的插值结果,引入迭代过程并改进逐像素的评价因子.最后,利用亮度信息的高频成分增强彩色图像.在Kodak数据集和实际场景采集图像上的实验结果表明,所提方法能够降低颜色混叠,重构出清晰的图像细节,且有/无参考图像的客观评价指标优于现有RGBW滤光阵列彩色重构方法.