摘要：Powered lower limb exoskeletons have traditionally used four or more powered joints to provide ambulation assistance for individuals with spinal cord *** with numerous powered joints commonly lost some excellent features of passive orthoses and further decreased utility due to added weight and increased control *** work adopts joints coupling mechanism to design a powered exoskeleton to minimize the number of actuated joints and control *** conventional powered exoskeletons,the joint-coupled-powered exoskeleton only has a single motor-actuated joint for each exoskeleton leg in conjunction with a unique knee coupled system to enable their users to walk,sit,and *** two types of joint coupled systems are designed,respectively,hip-knee coupled and knee-ankle *** joint-coupled-powered exoskeleton system allows a single actuator to power the hip motion,and allows activate knee motion through the coupled motions of the hip or *** specifically,when the mechanical coupled system is activated,the knee joint is unlocked,resulting in synchronized hip-knee or ankle-knee flexion and *** coupling mechanism is switched on and off at specific phases of the gait(the stance phase and the swing phase)to generate the desired *** research work proves that minimal actuated robotic systems with joint coupled could achieve safe and natural walking.

摘要：目前,可旋转天文圆顶仍被大量使用,工作时圆顶可360°旋转,望远镜通过打开的天窗进行观测。国家天文台兴隆观测基地的天窗选用5个导电滑环,但不能检测状态。为了简化天窗的状态检测、驱动系统,并提高其可靠性,利用二极管的单向导通特性设计了一种新型天窗状态检测、驱动电路。该电路只需要两个导电滑环和两个限位开关,即可实现天窗的状态检测和驱动控制。当天窗处于限位状态时,二极管构成的限位电路只允许电流单向导通。当天窗处于中间位置时,则可双向导通。该电路已经在85 cm望远镜等多个圆顶的天窗状态检测控制中成功应用。天窗状态检测、控制电路极大简化了测控系统,并可进行故障检测。

摘要：结合普通自密实混凝土固定砂石体积法与参数设计法,通过大量试验设计出了针对高强自密实混凝土的配合比设计方法。在此配合比设计方法中,通过骨料系数,水胶比,砂率,与掺合料添加量4个系数来确定配合比各组分用量。通过调整这4个系数就可以设计出不同需求的混凝土配合比。这种设计方法可以根据自密实混凝土在70～100 MPa内对强度的不同需求进行配合比设计,并同时考虑到骨料的不同粒型及尺寸。

摘要：文章简述了25MN铜挤压机搬迁大修时,对其泵站进行的升级改造,通过对液压泵合理的选型和重新布局,解决了设备缺陷、改善了设备性能。改造后的泵站运行良好,达到了设计和使用要求。

摘要：通过对带材受力的分析,导出了拉伸弯曲作用下带材所受工作辊作用力的计算公式,并通过绘制曲线的方式明确了工作辊中心高H、应力系数λ、带材厚度h、带材塑性变形渗透率K塑对工作辊作用力的影响,从而为拉弯矫直机的优化设计和生产工艺提供依据。

摘要：满深1断裂带奥陶系桑塔木组为泥岩、泥灰岩地层,裂缝发育,井壁坍塌风险极高,给安全钻井带来了极大挑战。满深1井钻进至井深7392.54 m(桑塔木组)时钻遇走滑断裂带,发生坍塌卡钻,处理难度大,最终选择回填侧钻。为此,分析了桑塔木组地层特点,研究应用了高性能防塌水基钻井液技术:选择合理的钻井液密度,强化对井壁的力学支撑,并采用复合降滤失措施降低水敏性泥岩地层的水化;在引入多氨基井壁抑制剂的同时,提高K+质量浓度,实现多元抑制防塌;提高钻井液的抗温能力、润滑性能及封堵性能,以满足桑塔木组对抑制、封堵防塌及抗高温稳定性的要求。现场应用表明,该井侧钻过程中钻井液性能稳定,K+质量浓度保持在35000 mg/L左右,150℃温度下的高压滤失量由11.3 mL降至8.0 mL,桑塔木组钻进过程中未发生井眼失稳情况,顺利钻至三开中完井深,套管一次下到设计位置。这表明,高性能防塌水基钻井液防塌效果显著,达到了预期目标。

摘要：针对核电安全设备有关的氢爆可用性验证一直存在无法真实模拟的难点,分析了影响核电设备氢爆可用性验证试验的因素。针对这些影响因素进行验证试验。在获得试验数据后,针对这些影响因素制定了相应的解决措施,并设计了核电设备氢爆可用性验证试验装置。该装置可模拟核反应堆失效时设备所处的极端环境。通过氢气燃爆同时实现核电厂严重事故环境条件下温度与压力曲线的包络,比用解耦的方式分别对温度、压力进行模拟更贴近实际工况,可准确控制氢气燃爆产生的温度与压力,从而解决氢爆后温度迅速跌降的问题。该设计可实现温度曲线的包络,确保试验舱内氢气燃爆后温度均匀。

摘要：背景:肝纤维化病程迁延且药物治疗效果不理想,基因治疗将成为这一领域研究的热点。研究显示白细胞介素(IL)鄄10对肝脏具有保护作用,可阻止肝纤维化的发生、发展。目的:克隆并鉴定Sprague鄄Dawley(SD)大鼠IL鄄10基因的全长cDNA,为进一步构建大鼠IL鄄10腺病毒重组子和肝纤维化基因治疗的研究奠定基础。方法:自行设计IL鄄10上下游引物,以逆转录聚合酶链反应(RT鄄PCR)从SD大鼠脾脏单核细胞中扩增编码大鼠成熟IL鄄10肽链的cDNA片断。扩增产物与连接载体pMD鄄18T连接后转化感受态菌DH5α,构建重组载体pMD鄄18T鄄IL鄄10。结果:以SD大鼠脾脏单核细胞总RNA为模板,RT鄄PCR扩增出大小为540bp的大鼠IL鄄10cDNA片断。所构建的重组质粒经HindⅢ+KpnⅠ双酶切显示含有目的基因片段,测序结果证实扩增出的DNA片断与大鼠IL鄄10基因序列相符,表明编码区无基因突变。结论:成功地克隆了大鼠IL鄄10基因的全长cDNA,并构建了重组载体pMD鄄18T鄄IL鄄10。

摘要：We report in situ doping of brushite on zinc manganese oxide（ZMO）, fabricated by calcining a Mn（II） oxalate‐impregnated metal‐organic framework. The doping process was conducted in com‐bination with the photocatalytic water oxidation reaction which was catalyzed by ZMO in neutral phosphate‐buffered aqueous solution containing [Ru（bpy）3]^2＋‐Na2S2O8 and calcium（II） triflate salt, exhibiting greatly enhanced water oxidation performance with optimized turnover frequency of 0.18 mmol（O2） mol（Mn）^（–1） s^（–1）. Different analytical techniques indicated that photodeposited calci‐um‐phosphate（CaP） acted as a co‐catalyst to promote the O2 evolution activity of ZMO. This system involved the use of manganese oxide and calcium ion, and the operation was conducted under am‐bient temperature and neutral conditions, thus, it efficiently mimicked the oxygen‐evolving complex in photosystem II.

摘要：Metal-organic-framework （MOF）-based materials with novel physicochemical properties have emerged as promising catalysts for various hydrogenation reactions. In addition to metal clusters and multifunctional organic ligands, MOF-based catalysts can incorporate other functional species, and thus provide various active sites for hydrogenation processes. The structural properties of the catalysts play significant roles in enhancing the interactions among the reactants, products, and catalytic sites, which can be rationally designed. Because of the synergistic effects between the ac-tive sites and the structural properties, MOF-based catalysts can achieve higher activities and selec- tivities in hydrogenation reactions than can be obtained using traditional heterogeneous catalysts. This review provides an overview of recent developments in MOF-based catalysts in the hydro-genation of alkenes, alkynes, nitroarenes, cinnamaldehyde, furfural, benzene, and other compounds. Strategies for improving the catalytic performances of MOF-based catalysts are discussed as well as the different active sites and structural properties of the catalysts.