摘要：In the past few decades,we have seen the rapid development of bioactive materials which can repair damaged tissues and save human ***,researchers have sought to develop bioactive materials with unique physical and chemical properties,such as stiffness,functional groups,nanotopographies and stimulus-responsive properties,to promote tissue regeneration at the biointerface.

摘要：Tissue implant-related infections are among the most serious complications after surgical implantation,including orthopedics and *** with antibacterial ion release systems are efficient and economical antibiotic substitutes to fight against bacterial ***,the excessive amount of released antibacterial ions may cause biological toxicity while killing *** raises a fundamental issue on how to properly control the amounts of ions and their ***,we develop low-dose antibacterial ions-incorporated ferroelectric implants(copper-doped potassium sodium niobate,K0.5Na0.5NbO3-Cu,KNNCu)whose surface potential can be tuned via external *** released Cu2+ions can be targeted to bacteria via endogenous electric field(EEF)between KNNCu implants and negatively charged ***,the antibacterial efficacy of the implants is determined by the amount of Cu^2+ions that reaches bacteria,instead of the total amount of released Cu2+*** amount of Cu2+ions reaching bacteria from the high-surface-potential implant is 2.4 times that from the lowsurface-potential implant within 12 h,resulting in the increased antibacterial ratio from about 65%to 100%,while remaining low cell *** work provides insights into the specific role of the EEF in guiding mass transport between charged materials and living organisms,and a new perspective for the design of high-performance antibacterial biomaterials.

摘要：几何要素是构成工件几何特征的点、线和面。研究了新一代产品几何量技术规范(GPS)中几何要素的术语、定义、分类以及它们之间的相互关系,介绍了几何要素的操作与操作算子等数学处理工具,并给出了在产品设计、规范和认证过程中的应用。

摘要：铝基金刚石新型复合材料是我国航天、电子封装等领域不可或缺的材料,但对其精密加工十分困难。采用ELID磨削技术对铝基金刚石进行精密磨削加工试验研究,探究不同磨削工艺参数对铝基金刚石加工表面质量的影响规律,并对各因素工艺参数进行优化。得出磨削深度9.3μm,砂轮线速度36 m/s,占空比63.7%电解电流11.5 A的最佳工艺参数组合,加工出表面粗糙度R a=149 nm的表面。

摘要：真空罐式卸污系统具有储能大、储物多等特点。在设计施工时,需满足《铁路污水处理工程设计规范》(TB 10079—2013)中的技术要求。根据现场条件,灵活运用技术条件,达到设定的抽吸效果,为今后真空罐式卸污系统的应用提供借鉴。

摘要：目前,电网规划按规划年最大负荷场景对电网网架进行规划设计。需求侧响应能达到削减年度尖峰负荷的效果,对电网规划产生影响。文章提出了一种基于用电采集数据的需求响应削峰潜力评估方法。首先,利用统计分析确定峰荷时段。其次,提出利用K-means聚类算法,以日负荷率、日峰谷差率、峰期负荷率、平期负荷率、谷期负荷率5个关键指标,对单一负荷进行降维聚类分析,从而确定适用于评估需求响应能力的用户典型日负荷曲线。在此基础上,综合考虑负荷所在行业的需求响应降负荷率和负荷峰谷差,量化评估负荷的削峰潜力。最后,根据拓扑结构,通过逐层叠加计算总需求响应的潜力及对峰值负荷的总影响。此文提出的方法可以帮助电网规划人员有效量化需求响应对系统峰荷的影响潜力,从而在规划时能考虑需求响应的影响,制定合理的未来电网投资方案。

摘要：本文采用自行设计根箱,研究了不同形态N肥(硫铵、尿素)施用条件下,植稻模拟生态系统中水稻苗期根圈微生物生物量C、N和亚硝酸细菌及反硝化细菌的动态变化。结果表明:不同N肥处理的水稻根圈土壤中微生物生物量C和N均高于非根圈土壤,而尿素处理又高于硫铵。两组N肥处理的水稻根圈土壤中亚硝酸细菌和反硝化细菌数量也比非根圈土壤高。硫铵处理的根圈亚硝酸细菌数量在施肥后第7天达到高峰;反硝化细菌数量有随时间呈递增现象。而尿素处理的根圈亚硝酸细菌和反硝化细菌均在第11天出现数量高峰。说明水稻根圈有明显的根圈效应,亚硝酸细菌和反硝化细菌的存在,是引起土壤硝化、反硝化气态N损失的潜在动力;对N的生物有效性而言,施用尿素比硫铵具有明显滞后期,有利于土壤N素对植物生长的持续供应,减少N素损失和环境污染。