摘要：变体飞机可以在飞行中充分改变外形获得最佳气动效率以适应变化的任务环境.覆盖在结构表面的蒙皮不仅要具有良好的面内方向柔性,产生满足设计变形量的光滑连续变形,同时要提供足够的垂直平面方向刚度,维持气动构型,并将气动载荷传递到下层结构.论文提出一种在十字形可变形蜂窝表面覆盖硅胶表层的结构作为柔性蒙皮,理论分析了该柔性蒙皮在面内方向的变形机理以及十字形可变形蜂窝的形状参数对其力学性能的影响,并与仿真和试验结果进行了比较.根据后缘变弯度机翼的设计要求,给出了柔性蒙皮的设计参数范围.结果表明该柔性蒙皮具有足够的面内方向变形能力和垂直平面方向承载能力,满足变弯度机翼后缘设计要求.

摘要：在现有区块链版权存证系统中,各种环签名占用过多存储空间,数据共识算法效率有待提高。针对此问题,使用动态累加器对环成员公钥进行累加,分别设计初始化、系统选取、密钥生成、签名生成、签名验证等算法,构造多私钥生成器(PKG)的身份基简短可验证环签名方案;为主节点选取设置信用阈值,降低允许参与共识的最大节点数,改进已有的联盟链共识算法;利用所构环签名方案及改进的共识算法,提出一种新的区块链版权存证协议。对所构签名方案的不可伪造性及匿名性进行形式化证明;对所构签名方案的计算效率及存储空间进行分析和仿真,对存证系统的共识算法和容错性进行实验评估。结果显示:所提协议节省了签名时间开销和存储空间,提高了共识效率和容错性。

摘要：有机-无机杂化钙钛矿太阳能电池被报道具有极高的功率转换效率,是下一代太阳能电池材料有希望的候选者,但其化学性质极不稳定,在高温高湿条件下易分解.本研究采用无机Cs阳离子取代CH_(3)NH_(3)PbI_(3)结构中的CH_(3)NH_(3)有机阳离子,利用第一性原理密度泛函理论,计算了未掺杂CH_(3)NH_(3)PbI_(3)钙钛矿和Cs阳离子掺杂钙钛矿的电子性质.结果表明,适当比例的Cs阳离子掺杂能够增强Pb-I的相互作用力,且Cs阳离子掺杂并未改变钙钛矿直接半导体的属性.Cs阳离子与Pb-I框架之间强的共价相互作用,导致Cs阳离子掺杂钙钛矿具有更加稳定的晶体结构.这项工作阐明了Cs阳离子掺杂钙钛矿材料高稳定性的潜在机理,可以为将来设计高效稳定的钙钛矿光伏材料提供一定的理论依据.

摘要：The parametric approach to design of hull form was studied in this work, which provides the means for quick generation and variation of hull form for the hydrodynamic optimization of hull form.

摘要：工装脚手架是船舶建造过程中必不可少的辅助工装,而结构干涉一直是工装脚手架搭设作业难以回避的问题。以极地多用途运输船为依托,通过梳理设计过程中工装脚手架的数字化设计思路,从设计方法、技术难点和解决策略等方面进行分析,提出一种应用三维模拟技术解决工装脚手架结构干涉问题的方法,结果表明:该方法可有效降低现场工装脚手架出现干涉情况的几率。研究结果对船舶工装脚手架的干涉避碰问题解决具有一定的参考价值。

摘要：气泡驱动型微马达功能材料由于能分解化学物质产生气泡,从而驱动自身运动、强化流体混合与传质,因此在污染治理、药物传送、环境监测、物质分离以及疾病诊断等方面展现出了独特的优势和极大的应用前景.制备该微马达功能材料的关键在于如何在其中可控构建非对称的结构.本文主要介绍了近年来可控制备具有多样化结构和功能的气泡驱动型微马达功能材料的研究新进展,着重介绍了如何基于非对称结构的构建来设计和制备颗粒状和管状等结构的新型微马达功能材料,以及如何在微马达中巧妙整合多样化功能组分和结构来实现其多功能化,以期为创新设计和可控制备具有独特结构和先进功能的气泡驱动型微马达功能材料提供新的途径和指导.

摘要：随着人们生活品质的提高、对生活细节的要求,在家居装饰领域里,高级定制、大家居整体软装以及个性化室内设计方案的定制模式形成热潮,我们在配套设计课程中也以市场实际作为参考,通过调研及对目前市场上装饰织物和纺织品配套设计状况的了解和实践练习,掌握配套设计的创意与表现技法,培养学生具有对纺织品配套设计的认识、整体构思及设计创意的能力。

摘要：Insulin is widely used in treating diabetes, but still needs to be administered by needle injection. This study investigated a new needle-free approach for insulin delivery. A portable powder needleless injection（PNI） device with an automatic mechanical unit was designed. Its efficiency in delivering insulin was evaluated in alloxan-induced diabetic rabbits. The skin irritation caused by the device was investigated and the results were analyzed in relation to aerodynamic parameters. Inorganic salt-carried insulin powders had hypoglycemic effects, while raw insulin powders were not effective when delivered by PNI, indicating that salt carriers play an important role in the delivery of insulin via PNI. The relative delivery efficiency of phosphate-carried insulin powder using the PNI device was 72.25%. A safety assessment test showed that three key factors（gas pressure, cylinder volume, and nozzle distance） were related to the amount of skin irritation caused by the PNI device. Optimized injection conditions caused minimal skin lesions and are safe to use in practice. The results suggest that PNI has promising prospects as a novel technology for delivering insulin and other biological drugs.

摘要：Thermal protection systems are very essential for high temperature thermal conductivity measurement system to reduce the heat loss to environment at the range of 600-1800 K. A compound multi-layer insulations structure which composed of inner carbon fibrous materials and outer alternately arranged alumina fibrous materials and high reflectivity foils is proposed for use in high temperature cylinder thermal protection systems. A coupled conductive and radiation governing equations is presented for heat transfer analysis of the structure. The finite volume method and the discrete ordinate method are used to solve the goveming equations. The optimization structure of the compound multi-layer insulations is investigated by considering the pressure of the gas, the density of the carbon fibrous materials, the density of the alumina fibrous materials, the number of reflective foil layers and the emissivity of reflective foils. The results show that the compound structure has the best thermal insulation performance when the pressure of the gas is below 0.01 kPa, the density of carbon fibrous materials is 180 kg m^-3, the density of alumina fibrous materials is 256 kg m^-3 and the number of reflective foil layers is 39. In addition, the thermal insulation performance is much better when the emissivity of reflective foils is lower.

摘要：As one of the key characteristics in cognitive wireless networks(CWNs),network environment awareness techniques have received much attention *** of traditional spectrum sensing technology that suffers from problems of miss detection,false alarm,hidden node,and inefficiency,cognitive pilot channel(CPC) technology has been proposed as one of the candidate solutions for an efficient and accurate network information delivery scheme to user equipment(UE).The aim of the CPC technology is to provide the necessary information for the reconfiguration of the UE using the public signaling *** ensure the efficient information delivery,the whole geographical area covered by the CPC is divided into square meshes of the same ***,two typical network information transmission modes for CPC deployment are also proposed:broadcast CPC mode and on-demand CPC *** further improve the efficiency of network information delivery,an efficient dynamic mesh grouping scheme has been designed which is based on the fractal theory for the broadcast CPC mode,where adaptive rectangular sized meshes are used to approximately cover the whole *** to the traditional fixed size mesh division strategy,results show that the proposed dynamic mesh grouping scheme significantly reduces the number of meshes by grouping similar meshes together,and the average delay of receiving CPC information on the UE side is therefore reduced.