摘要：With the development in spinning technology, the improvement of cotton fiber quality is becoming more and more important. The main objective of this research was to construct a high-density genetic linkage map to facilitate marker assisted selection for fiber quality traits in upland cotton (Gossypium hirsutum L.). A genetic linkage map comprising 421 loci and covering 3814.3 cM, accounting for approximately 73.35% of the cotton genome, was constructed using an F2 population derived from cross GX1135 (P 1 )×GX100-2 (P 2 ). Forty-four of 49 linkage groups were assigned to the 26 chromosomes. Fiber quality traits were investigated in F2 population sampled from individuals, and in F2:3 , and F2:4 generations sampled by lines from two sites and one respectively, and each followed a randomized complete block design with two replications. Thirty-nine quantitative trait loci were detected for five fiber quality traits with data from single environments (separate analysis each): 12 for fiber length, five for fiber uniformity, nine for fiber strength, seven for fiber elongation, and six for fiber micronaire, whereas 15 QTLs were found in combined analysis (data from means of different environments in F2:3 generation). Among these QTLs, qFL-chr5-2 and qFL-chr14-2 for fiber length were detected simultaneously in three generations (four environments) and verified further by combined analysis, and these QTLs should be useful for marker assisted selection to improve fiber quality in upland cotton.

摘要：Genetic transformation in some plant species,including cotton(Gossypium hirsutum), is hampered by laborious and time-consuming processes and often unachievable. Virus-induced gene silencing(VIGS) by double-stranded RNAs can serve as a reverse-genetics tool to determine gene function. However, knockdown levels vary greatly when using a tobacco rattle virus-based vector that carries different c DNA fragments of a gene. How to choose the optional target fragment for high interference efficiency is very challenging. Addressing this challenge requires increasing the efficacy of small interference RNA(si RNA) in target fragment. Here, we describe a method to assess VIGS efficiency by comparing the following parameters of si RNA in target sequence: the disruption energy of the target(DGdisruption), the differential stability of si RNA duplex ends(DSSE), and the internal stability at positions 9–14 of the si RNA antisense strand(AIS), which are calculated by Sfold program(http://***). We find that the si RNAs with low DGdisruption, high DSSE and high AIS have high activity and easily result in high VIGS efficiency by experimentally testing the actual knockdown levels of the four target genes, Gh PDS,Gh CLA1, Gh AOS1, and Gh CXE1 via choosing different target sequences for each gene. Therefore, the Sfold program can be used to analyze target sequences when carrying out VIGS design to increase gene-silencing effects in plants.

摘要：通过研究中国宋元时期的瓷器文化来启发和影响现代酒器的设计。从宋元时期瓷器的造型、工艺、色彩、功能进行分析探讨,进而论述现代酒器发展演变过程中在造型设计、工艺材料、色彩纹样、功能多样等方面上的创新应用,同时,注重时代背景下酒文化的发展趋势。将宋元时期瓷器传统文化元素与现代酒器设计巧妙结合,能赋予现代酒器设计深厚的艺术价值、文化内涵和产品竞争力,因此,需要我们在新的历史阶段,深入挖掘传统文化元素,努力实现符合人民审美价值的文化复兴。

摘要：柔性储能设备已成为改善人们生活品质不可缺少的新型可穿戴电子元件.锂离子电池作为主要的储能电源,其能量密度正逐渐接近其理论极限.近年来,以金属锂为负极的锂金属电池(LMBs)因极高的能量密度而得以复兴,有望成为新一代柔性电源的理想替代品之一.本文首先讨论了柔性锂金属电池需要解决的关键技术和科学问题,然后综述了柔性金属锂电池的最新进展,包括柔性锂金属负极、电解质、正极材料及其中间层的设计.本文还总结了柔性电池结构的研究进展,并强调了柔性性能评估和功能性集成对于确保复杂环境中佩戴安全性的重要性.最后,提出了柔性锂金属电池面临的挑战并对其未来发展方向进行了总结和展望.

摘要：针对微喷灌压力补偿灌水器流量调节不稳定、流态指数不达标的难题,设计一种结构紧凑且适用于微喷灌大流量的稳流流道结构,并通过数值模拟分析流道结构的消能机理和抗堵塞性能.应用ANSYS FLUENT软件,采取RNG k-ε模型获得消能流道内的压力场、速度场、涡量场以及颗粒物沉积分布情况.结果显示,流场结构的自冲洗性能优良,流道内局部沙粒浓度最高不超过8.5%,300 kPa工作压力下的抗堵塞性能最好.流道内部的涡量是反映含沙量的重要参数,涡量值与沙粒浓度成反比.W型圆弧流道及变径流道结构可以增加流体的紊动程度,有效地消能稳流,使灌水器在大流量下保证稳定良好的水力性能.研究结论为压力补偿灌水器的内部流道结构的优化提供了一定的参考.

摘要：Thermal resistance was composed by thermal resistance of Aluminum substrate, thermal resistance of convective heat transfer and the thermal resistance of the cooling liquid. The change rule was studied through the calculation on Aluminum plate thermal resistance, thermal resistance of convective heat transfer and the thermal resistance of the cooling liquid. Its change regular- ity was simulated by toolbox In the MATLAB, and it was found that thermal resistance of convective heat transfer effect on the effi- ciency was most obvious in a certain amount of the heat and flow for thermal resistance of the Pin-fin radiator under the premise. The structural parameters of radiator were related to the size of thermal resistance.

摘要：为了解浙江省幼儿园儿童发育性协调障碍(DCD)的情况,于2019年6至12月在浙江省11个地级市采取分层随机抽样法抽取200个普通幼儿园,并在其各年级中分层整群抽取1000个班级,共38900名儿童作为研究对象。应用中文版小龄儿童发育性协调障碍问卷及自行设计调查问卷对研究对象进行DCD筛查,回收有效问卷36807份,6.50%(2391/36807)儿童DCD筛查呈阳性。分析结果显示,儿童方面:男性、年龄≤5岁、超重或肥胖、左利手、共患运动或发育障碍性疾病、早产儿是儿童DCD的危险因素;父母家庭方面:母亲孕龄<20岁、母亲孕前超重或肥胖、父母中低文化水平、直系家庭、家庭收入低是儿童DCD的危险因素,建议针对相关危险因素及早开展预防与干预。

摘要：针对靶场测试当中CCD立靶测量系统需要稳定可靠触发的需求,提出一种双光幕触发系统。采用镜头式光幕探测器配合高亮度LED慢散射光源组成触发探测光幕,利用2个同样的光幕探测器配合测时装置组成区截测速系统,根据测得的速度值判定飞越探测光幕的目标是否为真实弹丸,并决定是否输出触发信号。根据速度值V和触发光幕至CCD探测光幕的距离计算出弹丸飞越至探测光幕的时间,然后在弹丸飞越将近至探测光幕的时刻输出触发信号。该方案不但可以提高系统的稳定性,避免非真实目标对系统的干扰,还可以为后续CCD图像采集系统在准确时刻提供触发信号。经实验证明,所设计的双光幕触发系统的速度测量误差不大于0.4%,完全满足CCD立靶测量系统需要精确触发的要求。

摘要：介绍了干涉式大气垂直探测仪主光学装置光学系统和机械结构的设计,分析了光学系统的成像质量,利用有限元技术对机械结构进行了分析和计算,得到了满足仪器性能要求的设计结果。

摘要：针对国内煤层气钻机各个工作模块之间相互没有合理的通信连接,各个系统的数据无法实现共享的问题,在煤层气钻机上引入了数据采集与监控系统。该系统针对不同通信协议下的工作单元,通过SAE J1939总线协议和Modbus-RTU协议转换,能建立起可靠、有效的数据采集和监控系统。系统设计时使用了无线发送和接收装置,可将钻机各项数据成功传至远程计算机上。现场应用结果表明,数据采集与监控系统不仅可以监控煤层气钻机的工作状态,还可记录并存储大量数据,改变了钻机原有各个电控系统相互独立、数据无法共享的状态。