摘要：The sound insulation performance of railway car body structures is critical for the control of rail vehicle interior *** sound transmission loss(STL)measurements,a niche with a large depth is necessary to allow for mounting the wide range of thicknesses of railway car body panels and for the mechanical isolation of the two *** this study,two typical interior floor panels are tested in a series of mounting conditions and mechanical boundary *** change of STL results during measurement is also predicted by an STL prediction model based on the finite element *** lower frequencies,the STL results are influenced by both the mounting positions and the mechanical boundary *** higher frequencies,the STL results are mainly influenced by the mechanical boundary *** between the panel in the infinite baffle and niches at the resonance and off-resonance frequencies are *** both the effects of mounting positions and mechanical boundary conditions,the existence of the cavity amplifies the STL difference caused by the mechanical boundary conditions.

摘要：延时起爆装置是燃烧转爆轰(DDT)技术的工程化应用。某型子弹药延时起爆装置的技术特点是:导爆索完成传爆,将爆轰信号传递给装置的点火药室;点火药室在外力的作用下打开传火通道,通过点火药的燃烧完成延时功能;同时,点火药的能量通过传火通道传递给炸药;炸药在管壳的束缚下实现DDT过程,输出稳定爆轰。在产品研制过程中,出现硼/硝酸钾点火药未点燃钝黑-5炸药、未可靠输出爆轰等现象。因此,为实现可靠点火并输出稳定爆轰,根据DDT技术的特点,完善硼/硝酸钾点火药的装药结构设计,即在点火药装药的输出端面上设置中心孔。当点火药燃烧阵面到达小孔后,燃烧产生的能量就能够通过打开的传火通道持续传递给炸药,减少起始阶段的能量逸散,达到提高炸药起始能量的目的,使得炸药向不稳定燃烧过渡,在金属管壳的束缚下实现炸药的弱爆轰,进而成长并输出稳定爆轰。通过对硼/硝酸钾点火药装药的重新设计,提高了某型子弹药延时起爆装置产品作用的可靠性。

摘要：高坝泄洪造成的总溶解气体(TDG)过饱和威胁河道生态安全,目前尚无较好的解决方法。因此,采用平面二维数值模型,针对日调节水库运行特征,研究了不同间歇性泄洪工况下的TDG饱和度分布。结合鱼类对TDG饱和度的耐受能力,分析了间歇性泄洪工况下可供鱼类躲避区域面积的变化规律。结果表明,在等时段间歇性泄洪模式下,随着间歇时间增加,鱼类可躲避区域面积平均值逐渐增加,但可躲避区域面积最小值随间歇时间增加先减小后增大;在不等时段间歇性泄洪模式下,提高间歇时间与泄洪时间之比将增加鱼类可躲避区域面积,降低可躲避区域面积最小值。研究结果可为高坝工程制定生态调度提供方法参考,对维护河流生态安全具有一定的生态意义。

摘要：目的通过开展连续性的医院感染综合监测,了解江苏省某三甲精神专科医院精神障碍住院患者连续10年医院感染情况及变化趋势,为预防和控制医院感染的发生提供科学依据。方法采用回顾性调查研究的方法,对2014年1月-2023年12月联勤保障部队第九〇四医院常州医疗区精神障碍住院患者综合性监测的医院感染率、感染部位分布、病原菌及抗菌药物使用情况等进行统计学分析。结果2014-2023年共调查33105例住院精神障碍患者,发生医院感染784例,感染率在1.78%~4.42%波动;感染发生部位主要为呼吸系统,占79.40%;抗菌药物使用率为14.51%,病原菌送检率为32.36%。结论本医疗区10年精神疾病患者医院感染发生率整体水平较高,需加强精神障碍疾病的感染风险评估与提前干预,降低医院感染的发生率。

摘要：2020年初,新型冠状病毒肺炎疫情牵动着广大青年设计师的心,优秀的传播内容鼓舞士气,优秀的设计也为抗疫带来帮助,每一笔冲击视觉的设计,每一句直击内心的文案,工业设计、医疗设计、建筑设计,80后、90后、00后无疑成为了抗疫设计的中坚力量。因为新型冠状病毒引发的肺炎疫情,让2020年的春天失去了本应绚烂的色彩。青年设计师们拿起手中的画笔,操作起计算机,为医务人员点赞,向奋斗在一线的工作人民致敬,为舂天上色。他们的智识、善意与创意,将会凝聚成这个春天最大的担当。

摘要：A series of novel triazole derivatives containing y-lactam were designed and synthesized, and their structures were confirmed by IH NMR, 13C NMR and HRMS, The in vitro antifungal activities of the target compounds were evaluated, The results showed that all of the compounds exhibited stronger activity against the six clinically important fungi tested than fluconazole. 3D and 3E showed comparative activity against the fungi tested except for Candida glabrata and Aspergillus fumigatus as voriconazole. In addition, the docking model for 2A and CYP51 was investigated.

摘要：目的探究即时性信息在现代包装创意设计中的表达方式与运用研究。方法通过对"即时性信息"概念的界定及其在现代包装设计中的意义,结合现代包装设计实例分析即时性信息在现代包装创新设计中的表现形式,基于消费者情感需求,从感官、行为、情境等方面分析即时性信息在现代包装设计中的表达方式研究。结论即时性信息在现代包装创新设计中是从消费者的情感需求出发,使包装成为消费者情感交流的纽带,从而通过消费者感官、行为、使用情境得以即时性信息的传递、反馈与体验。

摘要：文章以日本濑户内海艺术祭为研究对象,从治理结构的理论视角出发,结合多次实地考察和相关资料搜集,研究艺术介入型乡村复兴的机制。文章在研究过程中,重点关注艺术介入背景下的艺术家、开发商、游客及村民四类建设主体,并从时间线索和主体聚焦两个维度,分析了各类主体的行为方式,以及由此建构起来的治理结构,提出了作为一种乡村复兴的局部干预手段,艺术介入型乡村复兴机制的核心内容在于艺术文化的柔性介入和治理主体的多元参与。

摘要：In the one-gravity environment on the ground, the simulation of the contact process of two flying objects in the zero-gravity environment of space has been a challenging issue since humans first explored space by flying objects. Hardware-in-the-loop （HIL） simulation is an important and effective method to test the usability, reliability, and safety of real docking mechanisms in space. There are four main issues for HIL simulation systems： Design of simulators capable of high frequency response, high motion precision, high velocity, and rapid acceleration; compensation for simulation distortion; design of a control model for the HIL simulation process; and experimental verification. Here, we propose a novel HIL simulator system with a 6-DOF 3-3 perpendicular parallel mechanism and a 3-DOF 3-PRS parallel mechanism; discover the principle of simulation distortion; present distortion compensation models for the force measurement system, dynamic response, and structural dynamics of the simulator; and provide a control model for the HIL simulation process. Two kinds of experiments were performed on the pas- sive-undamped elastic rod and the docking mechanisms to test their performances and to verify the effectiveness and usability of the HIL simulator. The HIL simulation system proposed in this paper is useful for developing space docking, berthing, refu- eling, repairing, upgrading, transporting, and rescuing technologies.

摘要：通过黏度、拉伸、马歇尔、车辙和低温弯曲试验分析了掺2％～10％（质量分数）橡胶粉的改性环氧沥青及其混合料的性能．结果表明：掺橡胶粉后，改性环氧沥青的容留时间略有缩短，断裂延伸率有所提高，其中掺6％橡胶粉的改性环氧沥青断裂延伸率可达261％；与普通环氧沥青混合料相比，掺2％，4％，6％橡胶粉的改性环氧沥青混合料其高温稳定性能良好，低温脆性均有所改善，且掺4％，6％橡胶粉的改性环氧沥青混合料低温强度较高、变形能力较好．