Energy-absorption-based explanation of the photocatalytic activity enhancement mechanism of TiO2 nanofibers

As is reported, the photocatalytic activity will increase significantly when TiO₂ nanoparticles are agglomerated into TiO₂ nanofibers (NFs), but the photocatalytic activity enhancement mechanisms are still not fully understood. As is widely accepted, the optical absorption process plays a key role in photocatalysis, and it can even be said that the optical absorption capability of the photocatalyst directly determines its photocatalytic activity, while the influence of the structure on the optical absorption characteristics of TiO₂ has largely been ignored in the existing explanations. In this paper, optical simulations are introduced into analyzing optical characteristics of TiO₂ Nanofibers with which, the photocatalytic activity enhancement mechanism is further discussed, and a photocatalytic activity enhancement mechanism of TiO₂ Nanofibers is proposed.     

敷设声学覆盖层的板架结构抗冲击性能数值计算研究

为提高潜艇的隐身性能,通常在潜艇非耐压壳板外表面敷设消声瓦,在耐压壳体的外表面敷设隔声去耦瓦,在耐压壳体内表面敷设"阻尼层"(以上三种结构统称为多种声学覆盖层);由于声学覆盖层含有空腔的特殊结构形式,该空腔结构形式在受到爆炸冲击波时,腔体将产生变形并吸收能量,这将严重影响潜艇的抗冲击性能。因此,针对敷设声学覆盖层的板架结构的吸能性能进行研究,找出了覆盖层空腔结构变形、速度及加速度与冲击波能量吸收之间的关系,得到敷设声学覆盖层板架结构的抗冲性能;并对声学覆盖层结构进行优化,在此基础上,给出兼具抗冲和隔振功能的声学覆盖层结构设计及性能参数的优化建议。     

Z-Scheme Modulated Charge Transfer on InVO4@ZnIn2S4 for Durable Overall Water Splitting

The charge transfer within heterojunction is crucial for the efficiency and stability of photocatalyst for overall water splitting (OWS). Herein, InVO₄ nanosheets have been employed as a support for the lateral epitaxial growth of ZnIn₂S₄ nanosheets to produce hierarchical InVO₄@ZnIn₂S₄ (InVZ) heterojunctions. The distinct branching heterostructure facilitates active site exposure and mass transfer, further boosting the participation of ZnIn₂S₄ and InVO₄ for proton reduction and water oxidation, respectively. The unique Z-scheme modulated charge transfer, visualized by simulation and in situ analysis, has been proved to promote the spatial separation of photoexcited charges and strengthen the anti-photocorrosion capability of InVZ. The optimized InVZ heterojunction presents improved OWS (153.3 µmol h⁻¹ g⁻¹ for H₂ and 76.9 µmol h⁻¹ g⁻¹ for O₂) and competitive H₂ production (21090 µmol h⁻¹ g⁻¹). Even after 20 times (100 h) of cycle experiment, it still holds more than 88% OWS activity and a complete structure.     

系统安全工程能力成熟模型评估方法

系统安全工程能力成熟模型评估方法（SSAM）是利用系统安全工程能力成熟模型（SSE－CMM）评价组织的过程能力或企业的系统安全工程功能的方法，本文结合SSAM的结构介绍了使用SSAM的基本过程和思想。     

基于AHP与IFS的单件生产模式下制造需求与资源匹配算法

针对复杂大型装备的单件生产模式产品规格繁多、结构复杂且个性化强、工艺变更频繁且难以标准化、工艺编制难度大、加工周期长、对资源能力依赖严重等特点,以及制造服务提供企业在订单阶段难以对客户需求与当前制造能力的匹配度进行正确、快速预判等问题,提出了基于零件特征的单件生产制造需求和制造资源能力模型。引入基于层次分析法与直觉模糊集的特征工序矩阵与设备资源能力矩阵匹配算法,计算零件需求和资源的匹配度,实现订单阶段的用户需求和制造资源的快速匹配,最后通过企业实例验证了该方法的有效性。研究结果有助于提高单件制造企业的订单评估质量,降低接单风险,增强企业的竞争力。     

参数化零件族与参变工艺流程之间的几何关联方法

为减少零件设计与加工系统设计之间的某些中间环节,缩短产品开发周期,提出了一种在参数化零件族与参变工艺流程之间建立几何关联的方法。该方法首先对一给定的参变工艺流程确定其能够制造的零件集合,即工艺能力包集,用一串特征关系图表示流程中工件与资源的静动态关系,通过不同形式的子图匹配与合并生成能力包集中零件的特征参数模型。然后,比较能力包集和参数化零件族中的零件特征模型,在拓扑同构条件下求解它们的参数等效区域。基于等效区域,建立同时属于能力集合与零件族的零件模型,构成这两零件集合的交集。交集中的零件特征模型同时与参变工艺流程和零件族有几何参数映射关系,从而可作为连接两方面的桥梁,有利于在零件设计与工艺设计之间建立互动关系。     

Measuring manufacturing capability based on lower confidence bounds of C pmk applied to current transmitter process

Several process capability indices, including C_p, C_pk, and C_pm, have been proposed to provide numerical measures on manufacturing potential and actual performance. Combining the advantages of those indices, a more advanced index C_pmk is proposed, taking the process variation, centre of the specification tolerance, and the proximity to the target value into account, which has been shown to be a useful capability index for manufacturing processes with two-sided specification limits. In this paper, we consider the estimation of C_pmk, and we develop an efficient algorithm to compute the lower confidence bounds on C_pmk based on the estimation, which presents a measure on the minimum manufacturing capability of the process based on the sample data. We also provide tables for practitioners to use in measuring their processes. A real-world example of current transmitters taken from a microelectronics device manufacturing process is investigated to illustrate the applicability of the proposed approach. Our implementation of the existing statistical theory for manufacturing capability assessment bridges the gap between the theoretical development and the in-plant applications.     

井下模拟信号的转换传输

油田测井中,井下的测量参数输出信号为模拟量,本文详细介绍了本设计方案中将井下模拟信号转换成频率信号的原理,通过铠装将频率信号传送到地面,以及地面频率信号还原成模拟信号的原理,对设计进行了实验室验证.     

加强专业技术知识学习交流,提高重型装备产品设计水平

重型装备产品设计人员的专业技术水平决定着重型装备产品的质量.设计人员应加强专业技术和其他相关专业知识的学习与交流,提高综合业务素质,以提高重型装备产品的设计质量     

基于馈线互联关系的配电网最大供电能力模型

对配电网最大供电能力(TSC)计算准确性这一基础性问题进行了研究。现有文献的模型法和解析法均基于主变压器互联关系,经N-1安全校验仿真验证发现这些方法均存在一定的误差。为解决这一问题,文中提出了基于馈线互联的TSC模型及其计算方法。该模型能精确描述馈线间的手拉手和多分段多联络的互联方式,完整反映网架信息;计算结果能精确到TSC在馈线上的负荷分布,并在主变压器N-1故障基础上同时计及了馈线N-1故障。通过算例对比了文中方法与现有两种主要方法的结果。N-1安全校验仿真验证表明,文中所得TSC结果是N-1安全边界的临界点,结果准确。