摘要：采用全三维粘性数值模拟手段 ,通过与按常规设计转子对比的方法 ,分析研究了大小叶片轴流压气机转子流动特性。分析结果表明 :大小叶片转子流场在叶根亚声速区的流通能力增强、在叶尖跨声速区可以产生更加有利的激波体系 ;小叶片可以有效地控制叶栅槽道中气流扩散 ;在较高负荷和相同喘振裕度的条件下 ,大小叶片转子可以比按常规设计的转子在更高的压比。

摘要：基于LMI(LinearMatrixInequality,线性矩阵不等式),提出一种航空发动机PI输出反馈控制器设计方法。利用被控对象中控制向量2范数上界的限制,提出了一种改进ILMI(IterativeLMI)算法,用于解决控制受约束的航空发动机PI控制器的一种LMI描述求解问题。以某型双转子涡喷发动机为被控对象,基于LMI进行了PI输出反馈控制器的设计,并分区域在飞行包线进行了航空发动机控制系统仿真验证。结果表明,所得控制器满足预期设计要求,同时具有一定鲁棒性。

摘要：Anterior cruciate ligament(ACL)injuries of the knee are one of the most common and serious athletic *** widely used cortical suspension fixation buttons for ligament reconstruction are permanent implants,particularly those made from conventional steel or titanium *** this study,a biodegradable Zn-0.45Mn-0.2Mg(ZMM42)alloy with the yield strength of 300.4 MPa and tensile strength of 329.8 MPa was prepared through hot *** use of zinc alloys in the preparation of cortical suspension fixation buttons was proposed for the first *** 35 d of immersion in simulated body fluids,the ZMM42 alloy fixation buttons were degraded at a rate of 44μm/a,and the fixation strength was retained(379.55 N)in the traction ***,the ZMM42 alloy fixation buttons exhibited an increase in MC3T3-E1 cell viability and high antibacterial activity against Escherichia coli and Staphylococcus *** results reveal the potential of biodegradable zinc alloys for use as ligament reconstruction materials and for developing diverse zinc alloy cortical suspension fixation devices.

摘要：Aqueous zinc-ion batteries(AZIBs)show great potential for applications in grid-scale energy storage,given their intrinsic safety,cost effectiveness,environmental friendliness,and impressive electrochemical ***,strong electrostatic interactions exist between zinc ions and host materials,and they hinder the development of advanced cathode materials for efficient,rapid,and stable Zn-ion *** and their derivatives possess a large interlayer spacing,excellent hydrophilicity,outstanding electronic conductivity,and high redox *** materials are considered“rising star”cathode candidates for *** comprehensive review discusses recent advances in MXenes as AZIB cathodes from the perspectives of crystal structure,Zn-storage mechanism,surface modification,interlayer engineering,and conductive network design to elucidate the correlations among their composition,structure,and electrochemical *** work also outlines the remaining challenges faced by MXenes for aqueous Zn-ion storage,such as the urgent need for improved toxic preparation methods,exploration of potential novel MXene cathodes,and suppression of layered MXene restacking upon cycling,and introduces the prospects of MXene-based cathode materials for high-performance AZIBs.

摘要：深水大跨径斜拉桥在地震荷载作用下,桥梁水下部分与周围水体之间相互作用必然导致斜拉桥受到水体运动产生的动水力的作用。在已有Morison动水理论的基础上提出了一种适用于深水大跨径斜拉桥动力时程反应分析的动水力简便计算方法,并应用于南京长江第三大桥,分析了动水对斜拉桥结构的动力特性和地震反应的影响。研究发现:水与斜拉桥下部结构相互作用会使斜拉桥自振频率有所减小,其中第一阶自振频率相对无水时减小了8.24%;地震作用下动水对斜拉桥结构各个构件地震动力反应都有显著的影响,使主梁弯矩最多增大了7.73%,最不利桩位底部弯矩增大了14.22%。在深水斜拉桥结构进行抗震设计中,动水对斜拉桥动力响应的影响不容忽略。

摘要：为了了解不同圆形喉部方形出口内喷管和不同内喷管倾角及不同塞锥型面对塞式喷管性能的影响,选择更好的塞式喷管设计方案,从曲线坐标下的三维平均雷诺N S方程出发,用k ε两方程湍流模型封闭方程组,采用二阶精度无波动、无自由参数的耗散差分格式(NND格式),发展了模拟塞式喷管三维流场的数值程序。计算了具有不同转方位置、不同转方后型面和不同出口圆角内喷管的性能。比较了不同设计参数对塞式喷管性能的影响,通过比较得到了较为优化的结论。

摘要：针对导弹六自由度非线性模型,根据时标分离原理将导弹系统分为快慢不同的四个回路。针对快、慢回路,提出了一种基于神经网络的自适应滑模控制器设计方案。首先分别在快、慢回路中采用反馈线性化实现解耦控制,然后设计基于神经网络的自适应滑模控制器来保证系统鲁棒性及性能,其中神经网络用来逼近系统的不确定性。理论分析及计算机仿真都表明,按照该方法设计的控制器不仅具有较强的鲁棒性,而且保证了闭环系统的渐近稳定性。

摘要：研究了含决策状态反馈 DSS的设计 ,给出了实现决策状态反馈的三种方式 ,即查询方式、响应方式和系统支持方式 ,探讨了引入反馈机制对 DSS总体结构的影响 ,具体分析了数据库子系统、模型方法库子系统和知识库子系统的反馈实现方法 ,提出了数据库反馈字段的概念 ,并在此基础上开发了相应的生产管理决策支持系统 (PMDSS) ,实践证明 ,含决策状态反馈 DSS与传统 DSS相比 ,能够极大地提高决策的有效性 .

摘要：Lithography is a pivotal micro/nanomanufacturing technique,facilitating performance enhancements in an extensive array of devices,encompassing sensors,transistors,and photovoltaic *** key to creating highly precise,multiscale-distributed patterned structures is the precise control of the lithography ***,high-quality patterned ZnO nanostructures are constructed by systematically tuning the exposure and development times during *** optimizing these parameters,ZnO nanorod arrays with line/hole arrangements are successfully *** ZnO nanostructures with highly controllable morphology and structure possess discrete three-dimensional space structure,enlarged surface area,and improved light capture ability,which achieve highly efficient energy conversion in perovskite solar *** lithography process management for these patterned ZnO nanostructures provides important guidance for the design and construction of complex nanostructures and devices with excellent performance.

摘要：竹板材家具作为竹家具工业化生产的一个新的方向,可有效缓解我国木材短缺的现状,有利于充分利用我国丰富的竹林资源,但目前竹家具的设计、研究和生产仍存在许多不足。为了给竹家具的创新设计寻找一种新的现代化设计方法,本研究将KANO模型与TRIZ理论相结合,以竹质椅类家具为例,对竹家具设计展开研究。经过文献查阅调研后进行KANO问卷的设计,对KANO问卷结果进行分析后得出外观现代简洁、可调节2个魅力型需求指标。通过问卷所得的两项设计需求以及竹材自身性质的分析,进行了竹质椅类家具方案的初步设计。将问卷所得需求转化为3项技术矛盾,利用TRIZ矛盾矩阵寻找相应的发明原理并筛选出适用的设计方法进行分析,得出设计改进策略,代入初步设计方案中进一步优化,得出最终的竹质椅类家具方案。本研究通过完整的竹质椅类家具创新方案设计流程,验证了所建立的竹家具创新设计方法的科学性及实用性,为竹家具的设计、加工、生产等提供了更加标准高效的解决思路,从而为竹家具的设计制造提供参考。