摘要：This study focused on differences in vehicle-to-vehicle radio channel character- istics in the same region but different traffic density and speeds at 5.9 GHz （congestion and non-congestion）. The continuous measurement campaign was conducted on a city expressway through the complex dense urban area in Wu- hart, China. Small-scale channel characteris- tics including power delay profile, amplitude fading distribution, K-factor, delay spread and Doppler shift were obtained, respectively. Spe- cifically, the cumulative distribution function of root mean square delay spreads and root mean square Doppler spreads in the non-con- gested scenario and congested scenario were all fitted well with Lognormal distribution. We also found out that different intensity of traffic and speed of vehicles have little effect on root mean square delay spreads, but have a big im- pact on root mean square Doppler spreads and level crossing rate. According to estimation outcomes, the V2V channel characteristics for urban areas in Chinese big city were differ- ent from the previous measured results under similar scenarios in Europe. Delay spread and level crossing rate in this study can provide significant references to design the wireless communication system for vehicle-to-vehicle channel.

摘要：With the development of world globalization, English works as a lingua franca for intercultural communication among different cultures in the world. This shift implies that introducing solely English native speaking cultures to students is not sufficient for their needs. This paper depicts the reflective teaching process of my ten years of experience of teaching intercultural *** paper describes how the teacher systematically reflects on the practice of teaching,continuously revises the curriculum, and finally formulates an efficient model of integrating students’ personal experiences into developing students’ intercultural communicative competence and awareness. This reflective study attempts to provide some pedagogical implications for intercultural communication education.

摘要：用户体验作为房地产项目设计优化的重要导向为提升项目竞争力和用户满意度提供了明确的目标。对于功能性不足、舒适性体验欠佳和情感满意度缺失等问题,本文从空间布局、环境舒适度优化与社区情感关怀三个方面提出改进策略,重点解决空间利用低效、私密性不足及住户归属感薄弱等设计痛点。基于市场调研与案例分析来构建用户体验导向的核心设计指标体系,探讨模块化设计、智能化技术及文化元素融入的实际应用效果,为行业实践提供科学参考。研究结果验证了设计优化对提升居住功能性、环境适配性及情感联结的重要作用,明确了用户体验导向在房地产设计中的技术价值与应用意义。

摘要：在房地产项目设计过程中,成本控制是关键环节之一。通过有效的成本控制,在确保工程质量和收益的同时,减少项目的建设成本,降低风险,从而提升项目的收益。然而在现阶段房地产项目设计存在一定问题,影响了成本控制及风险管理的成效。因此,本文以房地产项目为研究内容,探讨其在运行中存在的问题,结合实际提出如何进行有效的成本控制及风险管理措施,从而提高房地产项目的经济效率,增强其在市场上的竞争力,促进房地产行业健康发展。

摘要：舵面效能损耗会直接影响柔性飞机阵风减缓效果,考虑舵面效能损耗是主动阵风减缓控制系统设计的关键。针对柔性飞机遭遇阵风干扰问题,以某大展弦比柔性飞机模型为对象,建立包含刚体运动和弹性模态的柔性飞机结构动力学模型,考虑舵面作动器存在舵面效能损耗的情况,设计一种自适应观测器实时在线估计舵面作动器效能因子,重构和求解自适应主动容错H_(∞)控制器,实现柔性飞机阵风载荷减缓。离散和连续阵风激励下的柔性飞机开/闭环时域响应仿真表明:在舵面无效能损耗情况下,H_(∞)控制与比例-积分-微分(PID)控制均能达到较好的减缓效果,H_(∞)控制相较于PID控制响应时间更快;在舵面存在效能损耗情况下,自适应观测器在4 s内能够完成效能因子评估,基于该效能因子设计的H_(∞)控制器能够达到与理想情况相当的阵风减缓效果。

摘要：The Chinese global carbon dioxide monitoring satellite （TanSat） was launched successfully in December 2016 and has completed its on-orbit tests and calibration. TanSat aims to measure the atmospheric column-averaged dry air mole fractions of carbon dioxide （XCO2） with a precision of 4 ppm at the regional scale, and in addition, to derive global and regional CO2 fluxes. Progress towards these objectives is reviewed and the first scientific results from TanSat measurements are presented. TanSat on-orbit tests indicate that the Atmospheric Carbon dioxide GratingSpectrometer is in normal working status and is beginning to produce LIB products. The preliminary TanSat XCO2 products have been retrieved by an algorithm and compared to NASA Orbiting Carbon Observatory-2 （OCO-2） measurements during an over- lapping observation period. Furthermore, the XCO2 retrievals have been validated against eight groundsite measurement datasets from the Total Carbon Column Observing Network, for which the preliminary conclusion is that TanSat has met the precision design requirement, with an average bias of 2.11 ppm. The first scientific observations are presented, namely, the seasonal distributions of XCO2 over land on a global scale.

摘要：课程思政自提出以来,作为一种适应新时代的先进教育理念,成为培养高层次人才的重要环节,在高校教育体系中扮演着尤为重要的角色,并呈现与各专业知识紧密结合的趋势,在这种联合趋势的影响下,艺术展演以传播思想载体的形式承担着课程思政的重任,伴随着数字时代的全面来临,艺术展演也呈现出诸多新形式和新内容,更深层次地影响着学生主观思维、行动准则,对于高校艺术展演的改革,融入课程思政内容,有助于高校学生理想信念的深层教育。

摘要：文中针对激光粉末床熔融(laser powder bed fusion,L-PBF)制造的GH3536样品,采用了不同的后处理工艺,并对其微观组织、力学性能和残余应力进行了分析.结合激光冲击强化技术,开展了构件表面残余应力调控,探究了热处理与激光冲击强化工艺顺序对残余应力的影响.结果表明,热处理中巨大的冷却应力撕裂了部分孔隙,同时,热处理不能完全消除构件表面约为+90 MPa的残余拉应力.随着冲击次数增加,残余应力的改善效果更显著,冲击两次后构件近表面呈现残余压应力状态,约为−350 MPa.相比在热处理前进行激光冲击强化,在热处理后进行强化更有利于残余拉应力的调控,从而实现性能的综合提升.文中研究结果为GH3536构件的增材制造及后处理工艺提供了新的思路,同时为其在航空航天领域的工程应用奠定基础.

摘要：纳米疫苗是肿瘤免疫治疗的重要组成部分,主要通过激活机体免疫系统抑制并清除肿瘤;但是肿瘤组织普遍存在的免疫抑制微环境会大大降低纳米疫苗的治疗效果.因此,设计制备既可以逆转肿瘤组织免疫抑制微环境,又可以激活机体抗肿瘤免疫响应的纳米疫苗,对肿瘤免疫治疗的发展具有重要意义.本文利用铁离子(Fe^(3+))和紫草素(Shik)之间的配位相互作用构筑了Fe/Shik超分子纳米结构,并通过负载鸡卵白蛋白(OVA,B16-OVA肿瘤抗原)和R837(TLR7激动剂,佐剂)制备了OVA/R837@Fe/Shik纳米疫苗.该纳米疫苗具有良好的胶体稳定性及抗肿瘤活性,可以在肿瘤微环境中特异性拆解并释放Fe^(2+),Shik,OVA和R837,通过诱导肿瘤细胞铁死亡和程序性坏死引发免疫原性细胞死亡并释放细胞裂解物,细胞裂解物协同OVA以及R837共同诱导树突细胞成熟,促进细胞毒性T淋巴细胞的激活与浸润以及巨噬细胞向M1表型极化,从而在逆转肿瘤组织免疫抑制微环境的同时激活机体的抗肿瘤免疫反应.

摘要：特征交互在推荐系统领域的广告点击率(Click-Through Rate,CTR)预测任务中至关重要,当前业界做的特征交互往往是基于内积、外积等矩阵变换,这些操作没有引入额外的信息,可以作为衡量两个向量相似性的手段,但作为特征交互的表示不一定是可靠的,许多特征交互无法有效提高点击率预测性能。首先从改善特征交互方式的角度入手引入额外的参数来学习一个映射,假设这个映射能够将两个向量的表征映射成交互的表征。学习映射的过程能够通过元学习(Meta-learning)来实现,故构建一个学习器以函数的方式表征特征交互。另外,不同的特征对不一定采取相同的方式交互,不能通过同一种交互方式得到所有特征对,因此设计一组元学习器(meta-learner)来学习映射函数,引入门控网络(GateNet)学习模型中元学习器的分布,那么不同的特征嵌入可以由一组元学习器得到表征。基于以上两点提出了一种融合多个元学习器并结合门控网络(Multiple meta-learners combined with GateNet,gate-MML)的特征交互算法,通过学习不同特征的联系和差异提高每个特征交互的质量。为了验证所提算法的性能,在xDeepFM模型上采用gate-MML做进一步的特征交互,采用2个真实广告点击率预测的数据集进行实验,并使用Logloss作为损失函数,AUC作为评价指标。实验结果表明与传统的CTR预测模型相比,改进算法提升了广告点击率预测任务的预测性能。