摘要：Integrating the topology design and printing method offers a promising methodology to realize large stretchability for ***,eco-friendly and waterbased Ag nanowires(NWs)inks were formulated and used for screen-printing highly stretchable and flexible interconnects on a large area(more than 335 mm x 175 mm).The stretchability of the interconnects was realized by introducing kirigami topology *** topology designed models were established to simulate the influence of kirigami patterns on wire compliance and to estimate the maximum stretchability via finite element analysis(FEA).The mechanic mechanism results demonstrate that an increase of the wave numbers results in larger stretchability,and the rectangular type of wave shows better stretchability than the zigzag and sine ***,the electrical and mechanical properties of the interconnects were measured and analyzed,and the experimental results were consistent with *** electric conductivity of the interconnects is stable at^10,427 S cm-1 even after 1000 cycles of 15.83 mm radius bending,280%stretching and 200%twisting-stretching deformation,demonstrating outstanding mechanical reliability of the *** topology designed interconnects have been applied in stretchable flexible light-emitting diode,indicating their broad application prospects in next-generation stretchable electronics.

摘要：By introduction of a new Fe(L^(1))_(2)spin-crossover(SCO)unit into the polynuclear system,a nano-scale Fe4(L^(2))_(4)molecular square architecture is designed through coordination-directed self-assembly *** the mononuclear Fe(L^(1))_(2)and tetranuclear Fe4(L^(2))_(4)complexes have bee门structurally confirmed by 1H nuclear magnetic resonance(NMR),electrospray ionization time-of-flight mass spectrometry(ESI-TOF-MS),and temperature-dependent single crystal X-ray diffraction ***-temperature magnetic susceptibility measurements reveal the presence of an abrupt SCO behavior with a thermal hysteresis width of 4K for Fe(L^(1))_(2).By clear contrast,Fe4(L^(2))_(4)undergoes a gradual spin transition behavior with enlarged thermal hysteresis width and higher spin transition temperature.

摘要：According to the quality of service （QoS） requirements of differentiated service （DiffServ）, a cross-layer resource allocation algorithm for multi-user orthogonal frequency division multiplexing （OFDM） systems is presented. The constant rate is maintained by adjusting the power dynamically for the voice traffics with high priority, whereas the fairness amongst the data traffics is guaranteed by weighted fairness queued （WFQ） algorithm. The two above-mentioned strategies are used for video traffics to realize variable data rate with the constraint of the minimum rate. Combing all these methods, both the throughput and the fairness are ensured when there are multiple users in the OFDM system. Simulation results indicate the validity of the proposed algorithm, which can work well even if the SNR is less than 0 dB.

摘要：在我国社会主义市场经济的建设中,广告越来越发挥着重要的作用。作为社会生活的要素,商业广告在追求经济效益的同时,必然对社会生活产生重要的影响。因此有必要从伦理学的角度分析商业广告的社会效益。商业广告的社会效益是广告主、媒介和受众在利益的博弈中应当作出的选择。商业广告活动应当从自身的存在及其价值出发,遵循市场规律和社会规范,坚持真实性、合法性的基本原则,把社会效益放在首要的位置,更好地为我国的社会经济发展服务。

摘要：21世纪城市规划设计的原则是如何规划和设计更为可持续发展的城市,城市形态与可持续之间的关系是当前国际环境研究领域热点议题之一。与此同时,棕色土地的可持续发展正受到欧美国家的大力扶持,棕色土地的规划设计再利用直接影响到城市形态,关系着城市集聚地产生、成长、形式、结构、功能和发展。对欧美国家棕色土地规划背景与发展进行研究,并以英国诺丁汉城市棕色土地更新与整治为例,试图从中找到适合我国棕色土地再利用的原则与方法,特别是地区工业用地再利用的可持续发展。

摘要：北方蔬菜温室全年生产的关键是冬季夜晚加热保温问题。应用生态学的理论,设计了一个白天利用太阳能加热,夜晚利用沼气燃烧加热保温的生态蔬菜温室。分析其运行过程可知,该温室具有良好的生态效益和经济效益。

摘要：针对折叠翼飞行汽车起飞阶段的动力匹配问题,研究了基本的动力控制策略,通过理论计算分析了起飞阶段双模式驱动特性,提出了最佳切换时刻的概念。对某型飞行汽车传动系统进行了动力匹配计算,并以该飞行汽车参数为基础,在Simulink中建立了不同工况下的行驶仿真模型,对起飞阶段行驶状态进行了仿真分析,给出了基于双模式驱动的动力匹配方案以及最佳切换时刻的选取原则。计算结果表明,通过采取双模式驱动,起飞加速时间缩短22%,起飞滑跑距离缩短13%。进一步对传动系统参数、整车设计参数以及发动机输出特性进行了优化分析,分析计算结果给出了各参数变化对起飞动力性能的影响。

摘要：提出频率响应遮蔽(frequency response masking,FRM)与改进型离散傅里叶变换(modified discrete Fourier transform,MDFT)相结合的近似精确重构的低复杂度星载信道化器。其中,FRM结构可以较低复杂度设计出过渡带陡峭的有限冲激响应滤波器(finite impulse response,FIR)低通原型,MDFT滤波器组结构可以基本消除滤波器组的邻带混叠,将FRM结构中不适合邻带拼接的结构改进为高通、低通滤波器互补结构,降低了拼接抖动。调整MDFT结构中的上采样率,使之适合于奇偶分离的信道化器。继而提出新的结构,更适合应用于非均匀带宽。仿真表明,所提方法具有更低的运算复杂度,更陡峭的过渡带和更窄的保护间隔,更小的重构误差。

摘要：为实现全膜覆盖种行覆土马铃薯机械化种植,针对地膜全域覆盖膜上对行覆土等难题,设计了马铃薯施肥播种起垄全膜覆盖种行覆土一体机。对样机关键部件进行了分析与设计,确定了液压偏置悬挂装置、跨越式膜上覆土装置、排种系统、碎土整形装置结构及工作参数,解析了核心部件作业机理。田间试验表明,马铃薯施肥播种起垄全膜覆盖种行覆土一体机膜下播种深度合格率为86%,种薯间距合格指数为89%,重种指数为5%,漏种指数为4%,种行覆土宽度合格率为92%,种行覆土厚度合格率为94%,邻接行距合格率为86%,地膜采光面机械破损程度为48.1 mm/m2,渗水孔间距合格率为96%。田间性能试验指标均达到国家和行业标准要求,试验结果满足设计要求,能够实现施肥、播种、起垄、全膜覆盖、种行覆土一体化作业。

摘要：国家制造强国建设战略咨询委员会、中国工程院战略咨询中心等机构近日联合发布的《2023中国制造强国发展指数报告》显示,2022年,中国制造强国发展指数超过120,在世界主要国家中居于较高水平,我国制造强国建设稳中有进。而制造强国的背后,离不开强大的设计与创造能力的支撑。国际经验充分证明,创新设计的发展水平已经成为国家产业核心竞争力的重要体现,也是世界制造强国的重要标志。美日欧等发达国家始终高度重视设计对产业创新的重要作用,把设计竞争力作为提高产业竞争力、国家竞争力的重要手段。