摘要：This work proposed a strategy of indirectly inducing uniform microarc discharge by controlling the content and distribution ofβ-Mg_(17)Al_(12)phase in AZ91D Mg *** kinds of nano-particles(ZrO_(2)and TiO_(2))were designed to be added into the substrate of Mg alloy by friction stir processing(FSP).Then,Mg alloy sample designed with different precipitated morphology ofβ-Mg_(17)Al_(12)phase was treated by microarc oxidation(MAO)in Na_(3)PO_(4)/*** characteristics and performance of the MAO coating was analyzed using scanning electron microscopy(SEM),energy dispersive spectrometer(EDS),X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),contact angle meter,and potentiodynamic *** was found that the coarseα-Mg grains in extruded AZ91D Mg alloy were refined by FSP,and theβ-Mg_(17)Al_(12)phase with reticular structure was broken and *** nano-ZrO_(2)particles were pinned at the grain boundary by FSP,which refined theα-Mg grain and promoted the precipitation ofβ-Mg_(17)Al_(12)phase in *** effectively inhibited the“cascade”phenomenon of microarcs,which induced the uniform distribution of discharge *** MAO coating on Zr-FSP sample had good wettability and corrosion ***,TiO_(2)particles were hardly detected in the coating on TiFSP sample.

摘要：Galloping cheetahs,climbing mountain goats,and load hauling horses all show desirable locomotion capability,which motivates the development of quadruped *** various quadruped robots,hydraulically driven quadruped robots show great potential in unstructured environments due to their discrete landing positions and large *** the most critical movement unit of a quadruped robot,the limb leg unit(LLU)directly affects movement speed and reliability,and requires a compact and lightweight *** by the dexterous skeleton–muscle systems of cheetahs and humans,this paper proposes a highly integrated bionic actuator system for a better dynamic performance of an *** propose that a cylinder barrel with multiple element interfaces and internal smooth channels is realized using metal additive manufacturing,and hybrid lattice structures are introduced into the lightweight design of the piston *** addition,additive manufacturing and topology optimization are incorporated to reduce the redundant material of the structural parts of the *** mechanical properties of the actuator system are verified by numerical simulation and experiments,and the power density of the actuators is far greater than that of cheetah *** mass of the optimized LLU is reduced by 24.5%,and the optimized LLU shows better response time performance when given a step signal,and presents a good trajectory tracking ability with the increase in motion frequency.

摘要：Developing materials with excellent properties has been the untiring pursuit of *** glasses(MGs)would be the ideal metallic materials if their size could be scaled up to be comparable to traditional *** address this challenge,a variety of approaches have been attempted over the past decades,including thermodynamicsbased alloy,3D printing and the recent artificial intelligenceguided optimal *** this study,a facile and flexible route was demonstrated to manufacture giant MGs(GMGs)with diameters more than 100 mm through the thermo-joining *** jointed GMG samples feature almost the same performance as the as-cast *** ability of manufacturing complex 3D components such as the Chinese Zodiacs was also *** approach might overcome the longstanding problem of glass forming ability(GFA)limitations in alloy systems and pave new concept and route to fabricate size unlimited MGs.

摘要：g-C3N4 is a metal-free semiconductor and a potential candidate for photocatalytic H2 production,however,the drawbacks,rapid recombination rate and limited migration efficiency of photogenerated carriers,restrict its photocatalytic ***,Co(II)as a hole cocatalyst modified P-doped g-C3N4 were successfully prepared to ameliorate the separation efficiency of photoinduced carriers and enhance the photocatalytic hydrogen *** photocatalytic results demonstrated that the P-doped g-C3N4(PCN)exhibited higher photocatalytic activity compared with pure g-C3N4,while Co(II)/PCN photocatalyst exhibited further enhancement of photocatalytic *** proposed possible mechanism based on various characterizations is that P-doping can modulate the electronic structure of g-C3N4 to boost the separation of photogenerated-e-and h+;while the synergistic effect of both Co(II)(as hole cocatalyst)and Pt(as electron cocatalyst)can not only lead to the directional shunting of photogenerated e+-h?pairs,but further accelerate the photogenerated electrons transfer to Pt in order to join the photocatalytic reduction process for hydrogen *** a result,the transportation and separation of photoinduced carriers were accelerated to greatest extent in the Pt/Co(II)/PCN photocatalyst.

摘要：Co_(2)VO_(4) with Co tetrahedrons and octahedrons of transition metal oxides has achieved progress in electrocatalysts and ***,high metal-metal interactions make it challenging to maintain high reactivity as well as increase the conductivity and stability of *** this work,spinel-structured CoZn_(0.5)V_(1.5)O_(4) with a high specific surface area was synthesized through an ion-exchange process from the metal-organic frameworks of *** functional theory calculations indicate that the replacement of transition metal by Zn can decrease the interaction between the transition metals,leading to a downshift in the π^(∗)-orbitals(V-O)and half-filled a_(1g) orbitals near the Fermi level,thus increasing the conductivity and stability of CoZn_(0.5)V_(1.5)O_(4).As a supercapacitor electrode,CoZn_(0.5)V_(1.5)O_(4) exhibits high cycling durability(99.4% capacitance retention after 18,000 cycles)and specific capacitance(1100mFcm^(-2) at 1mAcm^(-2)).This work provides the possibility of designing octahedral and tetrahedral sites in transition metal oxides to improve their electrochemical performance.

摘要：极地低温、高湿、高风速、高盐度、极昼极夜等极端环境易导致船舶、低空飞行器等近海面装备表面结冰,严重影响装备正常运行。为应对极地复杂环境带来的冰害,国内外学者围绕结冰预测探测方法、防除破冰技术等开展了大量对比实验与数理建模研究,对既有涉冰研究进展进行了分析总结。结果表明:结冰预测方法主要基于经验、理论与数值3种模型,其中,理论模型准确度小于50%,而数值模型准确度大于60%;结冰探测主要采用观测与检测两种方法,其中,平均结冰厚度的观测法与检测法测量精度分别可达±0.038 mm与±0.05 mm;极地装备表面的覆冰源自海浪飞沫、雨雾飞沫与大气,其中,海浪飞沫占比高达90%;防除冰技术有被动式和主动式两种,前者能耗低且寿命短,后者效率高但装置复杂,两者结合仍是未来发展趋势;极地水上船舶破冰主要采用冲撞、顶撞与首压技术,冰下潜艇破冰则采用机械挤压、鱼雷爆破与激光融冰等直接破冰或“先弱冰再破冰”的耦合技术。基于本文对极地低温环境结冰预探测方法与防除破冰技术的分析,进一步提出了既有方法与技术的优化方向,以期为复杂低温环境中载运装备及工程设备的冰灾护控技术发展提供参考与借鉴。

摘要：背景:随着人工生物材料和手术技术的不断更新进步,人工膝关节置换已成为改善膝骨关节炎患者生活质量的首选方式。但是人工膝关节置换后疼痛剧烈,目前尚无较好的治疗措施。电针治疗是缓解疼痛的低成本选择,结合超前镇痛具有广泛应用前景。目的:观察巨刺电针联合超前镇痛对膝骨关节炎患者初次行单侧人工膝关节置换后镇痛效果的影响。方法:采用随机对照设计,选择上海市光华中西医结合医院初次行单膝人工关节置换患者120例为研究对象,采用统计软件SPSS 25随机分为3组:超前电针组、术后电针组和假电针组,每组40例。超前电针组在术前1 d、麻醉诱导前30 min、术后1-3 d进行巨刺法电针治疗;术后电针组在术后1-3 d进行相同取穴和参数的治疗,术前1 d、麻醉诱导前30 min行假电针治疗;假电针组取相同穴位参数的5次假电针治疗。比较3组术后患者数字疼痛评分较术前改善情况、术中瑞芬太尼和丙泊酚使用量、患者术后首次使用静脉自控镇痛的时间、术后恶心呕吐例数、术后术侧大腿周径增加率和电针实施盲法成功率。结果与结论:(1)与超前电针组比较,术后第4天术后电针组和假电针组静息数字疼痛评分差值明显降低,术后第7天假电针组静息数字疼痛评分差值明显降低(P0.05);(3)与超前电针组比较,术后电针组和假电针组术中瑞芬太尼用量明显增加(P0.05);(8)人工膝关节假体具有良好的生物相容性。结果表明:巨刺电针结合超前镇痛可缓解术后急性疼痛,减少术中麻醉药量,延长术后补救镇痛时间,减轻术后不良反应,降低术后大腿周径增加率。

摘要：医联体是推进分级诊疗制度建设的有效载体,三级医院为实现自身诊疗服务功能定位,谋求高质量发展,需广泛开展医联体合作拓展工作。本文将客户关系管理的思想应用于医联体合作拓展工作中,使三级医院管理者能通过各种统计报表,将医联体合作的医院基本信息、医疗运行数据、分级诊疗合作数据、联络人沟通记录等信息详细分析,从而了解合作医院的需求变化及趋势,各合作医疗机构分级诊疗业务量及合作意愿,以便制定调整科学合理、适应于双方实际需求的合作方案。系统从合作医院的筛选、跟进、确立、联络,到合作项目开展、合同管理,实现院际合作关系的全程管理以及业务拓展团队的绩效管理。

摘要：The conversion of electromagnetic energy into heat by nanomagnets has the potential to be a powerful, non-invasive technique for cancer therapy by hyperthermia and hyperthermia-based drug release, while temperature controllability and targeted heating are challenges to developing applications of such magnetic inductive hyperthermia. This study was designed to control the hyperthermia position and area using a combination of alternating current （AC） and a static magnetic field. MnZn ferrite （MZF） nanoparticles which exhibited excellent hyperthermia properties were first prepared and characterized as an inductive heating mediator. We built model static magnetic fields simply using a pair of permanent magnets and studied the static magnetic field distributions by measurements and numerical simulations. The influence of the transverse static magnetic fields on hyperthermia properties was then investigated on MZF magnetic fluid, gel phantoms and SMMC-7721 cells in vitro. The results showed a static magnetic field can inhibit the temperature rise of MZF nanoparticles in an AC magnetic field. But in the uneven static magnetic field formed by a magnet pair with repelling poles face-to-face, the heating area can be restricted in a central low static field; meanwhile the side effects of hyperthermia can be reduced by a surrounding high static field. As a result we can position the hyperthermia area, protect the non-therapeutic area, and reduce the side effects lust by using a well-designed combination of AC and static field.

摘要：【目的】研究旨在探讨人工湿地中常用的4种填料(沸石、陶粒、石英砂、砾石)对水体中有机物、氮、磷及部分重金属离子的净化效果,并分析填料的改性技术对净化效能的提升作用,以期为人工湿地填料的选型及优化提供参考。【方法】文章首先概述了填料的直接吸附、截留及为动植物和微生物提供生存基质等净化机理;详细分析了4种填料对不同污染物的净化效果。同时,综述了当前常用填料的改性技术,并探讨了这些技术在增强填料净化效果和拓宽应用范围方面的研究进展。【结果】研究发现,各类填料因其固有的物理化学特性,在针对不同污染物的去除中展现出不同的效能。层状双金属氢氧化物覆膜改性、饱和盐改性、铁盐改性、酸改性等常用改性技术能够显著提高对特定污染物的去除率,增强填料的净化能力。【结论】通过评估常见填料及其改性技术对水体中主要污染物的净化效果,发现不同填料和改性技术在净化效果上存在显著差异。因此,在选择人工湿地填料时,应根据目标污染物的种类和浓度,综合考虑填料的物理化学特性、成本及普适性等因素;通过改性技术提升填料的净化效果,可以进一步优化人工湿地的设计和运维,推动人工湿地技术在生态环境保护领域中的应用。