摘要：Developing novel electrode materials for li-thium-ion batteries （LIBs） with rapid charge/discharge cap- ability and high cycling stability remains a big challenge to date. Herein, we demonstrate the design and synthesis of ul- trathin MoS2 nanosheets in-situ grown on sponge-like carbon nanospheres by a simple diffusion-controiled process. The unique sponge-like carbon nanosphere core can be used as ＂reservoir＂ of electrolyte by adsorbing to shorten the ion- diffusion path, and meanwhile as ＂elastomer＂ to alleviate the structural change of the MoS2 nanosheets during the charge/ discharge processes. Furthermore, the vertical ultrathin MoS2 nanosheets with broadened interlayer space greatly enrich the electrochemical active sites. Consequently, the as-obtained MoS2/C nanospheres exhibit increased specific capacities at various rates with superior cycling stability compared to the MoS2/C floccules. It is reckoned that the present concept can be extended to other electrode materials for achieving high- rate and stable LIBs.

摘要：针对孟加拉国某港口工程真空预压加固中遇到的透水性较差的黏土层和透水性较好的砂土层反复交互出现,可能存在边界透水透气、地基固结规律复杂难以预测、地基加固效果难以预测等问题。依托工程的试验区块及典型施工区块,研究黏土搅拌桩的密封墙密封效果、透水层对固结速度理论计算的影响、复杂互层场地加固后的物理力学特性改变等。主要采用试验检测和试验实测数据与理论计算数据对比分析的方法,对表层沉降-时程曲线、孔隙水压力消散曲线、加固前后的SPT指标、压缩性指标等比较研究。结果表明:黏土密封墙在粉砂地层具有良好的适应性,透水性砂层的存在对于实际场地固结的影响远小于理论或者理想边界条件下的试验,真空预压对于复杂互层地基具有较好的加固效果等。对于在复杂互层地基上的真空预压法加固设计具有一定的参考意义。

摘要：星载GNSS-R干涉测高技术通过调制GNSS卫星信号的宽带混合码,可以实现高精度宽幅海面测高。为有效验证星载GNSS-R干涉测高性能,本文设计了基于岸基GNSS-R干涉测高结果,开展星载GNSS-R干涉测高精度等效评估的策略。评估结果表明,GNSS-R干涉测高与卫星导航系统信号体制及信号信噪比相关,星载GNSS-R干涉测高可实现分米级测高精度。本文的研究成果可为后续星载GNSS-R干涉测高工程实践提供技术参考和数据支持。

摘要：本文就当下服装企业面对新锐设计师的创意设计遭遇市场的尴尬展开研究与分析。

摘要：Direct photocatalytic coupling of methanol to ethylene glycol(EG)is highly *** reported photocatalysts for this reaction are all metal sulfide semiconductors,which may suffer from photocorrosion and have low ***,the development of non‐sulfide photocatalysts for efficient photocatalytic coupling of methanol to EG and H2 with high stability is urgent but extremely ***,the first metal oxide photocatalyst,tantalum‐based semiconductor,is reported for preferential activation of C−H bond within methanol to form hydroxymethyl radical(•CH_(2)OH)and subsequent C−C coupling to *** with other metal oxide photocatalysts,such as TiO2,ZnO,WO_(3),Nb_(2)O_(5),tantalum oxide(Ta_(2)O_(5))is unique in that it can realize the selective photocatalytic coupling of methanol to *** co‐catalyst free nitrogen doped tantalum oxide(2%N‐Ta_(2)O_(5))shows an EG formation rate as high as 4.0 mmol gcat−1 h−1,about 9 times higher than that of Ta_(2)O_(5),with a selectivity higher than 70%.The high charge separation ability of nitrogen doped tantalum oxide plays a key role in its high activity for EG *** catalyst also shows excellent stability longer than 160 h,which has not been achieved over the reported metal sulfide ***‐based photocatalyst is an environmentally friendly and highly stable candidate for photocatalytic coupling of methanol to EG.

摘要：目的研究不同年资眼科医生能否区分真实眼底照片和生成对抗网络(GAN)生成的眼底照片,以探究GAN是否可应用于眼科临床教学。设计诊断试验。研究对象真实眼底照片和图片生成器生成的虚拟眼底照片各70张。方法随机纳入北京同仁医院眼科医生、眼科学专业学位研究生和非眼科医生20人。使用真实眼底照片对模型进行训练得到一个高质量的图片生成器,随机生成70张虚拟眼底照片并与真实的眼底图片以1:1混合,由各年资眼科医生进行照片真假性辨认。主要指标医生辨别眼底照片真伪的敏感度、特异度、准确性。结果20位医生辨别眼底照片真假性平均敏感度为0.578(0.314~0.871),平均特异度为0.471(0.014~0.729),平均准确度为0.524(0.236~0.707)。高年资医生组的准确性与其他组医生之间并无统计学差异(P>0.05)。结论基于GAN模型生成的虚拟眼底照片具有同真实眼底照片相似的细节特征,未来可用于生成高质量眼底图片辅助眼科教学及基层眼底医生的培训。

摘要：背景:钩椎关节作为颈椎所特有的结构,其发生、发展和发育直接影响着颈椎的稳定性和活动度,也与颈椎病的发病密切相关,深入了解钩椎关节的发育特点对颈椎病的发病类型、诊断与治疗有着重要意义。目的:利用影像学和三维重建技术对不同年龄段的颈椎钩突相关夹角进行大样本测量和观察,旨在揭示其随年龄和椎骨增长变化的特点,以及与颈椎稳定性之间的关系。方法:采用回顾性设计,将收集到的符合研究要求的1447例完整颈椎节段CT影像学资料的原始数据以DICOM格式导入Mimics 21.0软件进行后处理,并进行钩突夹角、钩突矢状位角测量,按照性别、年龄、侧别分组。结果与结论:①钩突夹角随椎序的增加呈V字形增长,其最低峰值位于C5处;总体随年龄的增长呈尖峰状,其峰值多介于30-39岁年龄范围内;②钩突矢状位角随椎序的增加呈鱼钩样增长、总体随年龄的递增也呈尖峰状,其峰值多介于20-29岁年龄范围内;钩突夹角与钩突矢状位角在侧别和性别间仅部分存在显著性差异(P<0.05);③提示钩突夹角随椎序递增呈V字形增长;钩突矢状位角随椎序递增鱼钩样增长,而2个夹角随年龄的增长总体呈尖峰状,钩突夹角在131°左右,可能与颈椎的稳定性密切相关;而钩突矢状位角在14°左右,可能对限制颈椎过度旋转有一定作用。

摘要：为提高在直流系统发生短路故障时固态断路器(SSCB)的分断能力,提出一种考虑分断特性的低压直流固态断路器参数多目标优化方法。首先对短路故障时SSCB的分断流程进行详细分析,通过理论与仿真确定了限流电感LB和金属氧化物压敏电阻的限电压能力系数γ对分断特性的影响。以分断特性为基础,建立了SSCB的分断冲击性能指标、分断时间指标、能量吸收指标三个优化目标函数,通过多目标粒子群算法对目标函数进行优化,采用结合决策者偏好的逼近于理想解的排序方法对优化方案进行决策。优化结果表明,在各种决策者偏好下的优化方案,其优化设计后的元件参数LB和γ均能显著提高SSCB的分断性能。

摘要：Critically discuss in relation to the infuence of ‘new urbanism’ on popular debates surrounding contemporary planning policy and practice,more generally,for planning *** This essay will talk about good places in relation to the design theory of ‘New Urbanism’.It will consider how policy may have been influenced by

摘要：为了快速响应客户对产品造型风格的需求,提出了以风格意象认知需求驱动造型设计特征推理的方法.结合自然语言处理的方法和主成分分析法提取客车造型风格关键语义特征,并采用里克特7点量表对风格描述数据进行离散化表达.通过眼动追踪测试实验提取了客车造型关键几何特征.在构建产品造型关键几何特征线原型方阵的基础上,建立了客车造型意象认知-设计特征之间的映射机制和推理方法.客车改型设计实例分析结果表明,这种基于意象认知的设计方法能够满足客户对产品造型风格的感性需求,较以往主观经验性设计模式具有更强的针对性和指导性.