摘要：As the only way for air to enter the lungs,the trachea plays an indispensable role in conducting,cleaning,and humidifying ***,trauma,and congenital disease of the trachea are serious threats to patients[1].Local tracheal disease can be treated with a balloon or stent,but for extensive tracheal disease,tracheal reconstruction after surgical resection is the only treatment[2–4].However,the tension of the anastomotic site also increases with expansion of the resection range,which causes a series of complications,such as poor anastomotic healing,anastomotic fistulae,and tracheal rupture,and even life-threatening complications in severe cases[5].

摘要：In this work, we present a three dimensional micromixer which consists of two layers of spiral channels overlapped together in the vertical direction. This micromixer is designed by using a smooth channel twisted into double-layer spiral geometry with simple topological structure. Based on the principle of Dean effects, this kind of structure is beneficial to produce, enhance and sustain the Dean vortices, which can perturb the laminar fluid effectively. In order to improve the mixing performance, the detailed parameters have been optimized by using the computational fluid dynamics software. The results indicate that the erect channel which is connected with the two layers of spiral channels plays a critical role for well mixing. Meanwhile, the effect of mixing has been identified in a fabricated glass-micromixer. The mixing efficiency of 90% has been achieved by optimizing the flow rate and the structure of the erect channel. Thus, this micromixer has manifested high mixing efficiency and presents good practicability in the versatile microfluidic systems.

摘要：Geometry mesh introduces user control into tex- ture synthesis and editing, and brings more variations in the synthesized results. But still two problems related remain in need of better solutions. One problem is generating the meshes with desired size and pattern efficiently from easier user inputs. The other problem is improving the quality of synthesized results with mesh information. We present a new two-step texture design and synthesis method that addresses these two problems. Besides example texture, a small piece of mesh sketch drawn by hand or detected from example texture is input to our algorithm. And then a mesh synthesis method of geometry space is provided to avoid optimizations cell by cell. Distance and orientation features are introduced to im- prove the quality of mesh rasterization. Results show that with our method, users can design and synthesize textures from mesh sketches easily and interactively.

摘要：Computational diffusion kinetics(CDK),with a spirit of and being coupled with the computational thermodynamics(CT,or called as the CALPHAD technique),plays increasingly important role in the alloy design/optimization and microstructure control during the processing of advanced metallic *** paper is to highlight recent progress of CDK in research with great focus on novel Ti and Zr alloys,which was largely performed in the authors’*** ends with one representative example of the applications of CDK,coupled with CT,quantitative phase field,and three-dimensional(3D)statistical calculation,in designing the heattreatment schedule for the dual phase(αβ)Ti–6Al–4V alloys.

摘要：The imaging mass spectrometry（IMS） technology has experienced a rapid development in recent years.A new IMS technology which is based on air flow assisted ionization（AFAI） was *** allows for the convenient pretreatment of the samples and can image a large area of sample in a single measurement with high *** AFAI in DESI mode was used as the ion source in this *** new IMS method is named *** adoption of assisted air flow makes the sample pretreatment easy and *** optimization of the distance between the ion transport tube and MS orifice increases the sensitivity of the *** data processing,a program based on MATLAB with the function of numerical analysis was developed.A theoretical imaging resolution of a few hundred microns can be *** composite AFAI-IMS images of different target analytes were imaged with high sensitivity.A typical AFAI-IMS image of the whole-body section of a rat was obtained in a single analytical *** ability to image a large area for relevant samples in a single measurement with high sensitivity and repeatability is a significant *** method has enormous potentials in the MS imaging of large and complicated samples.

摘要：A novel n-type junctionless field-effect transistor(JLFET) with a step-gate-oxide(SGO) structure is proposed to suppress the gate-induced drain leakage(GIDL) effect and off-state current I_(off).Introducing a 6-nm-thick tunnel-gateoxide and maintaining 3-nm-thick control-gate-oxide,lateral band-to-band tunneling(L-BTBT) width is enlarged and its tunneling probability is reduced at the channel-drain surface,leading the off-state current I_(off) to decrease ***,the thicker tunnel-gate-oxide can reduce the influence on the total gate capacitance of JLFET,which could alleviate the capacitive load of the transistor in the circuit *** simulation shows that I_(off) of the new optimized JLFET reduced significantly with little impaction on its on-state current Ion and threshold voltage V_(TH) becoming less,thus showing an improved I_(on)/I_(off) ratio(5×10^(4)) and subthreshold swing(84 mV/dec),compared with the scenario of the normal *** influence of the thickness and length of SGO structure on the performance of JLFET are discussed in detail,which could provide useful instruction for the device design.

摘要：禅宗是印度佛教和中国儒家、道家思想相融合而形成的本土化佛教宗派,具有浓厚的哲学内涵和美学色彩。南宋禅宗思想的审美化、艺术化以及梁楷的个人性情、生活经历联袂促使梁楷与禅宗紧密相连,这种关联对于梁楷减笔、泼墨风格的生成具有重要影响。梁楷写意人物画的构图、图式、造型、笔墨、形式方面皆表现出独特的艺术特征,蕴含着诸多禅宗思想,展示出多元的价值内涵。此外,梁楷画风能够不断对历代写意人物画产生影响、发生效果。同时,梁楷写意人物画中所蕴含的禅宗美学,也被日本绘画所接受与回应,彰显出中华文化在海外的广泛传播与深远影响。

摘要：为研究中国快速消费品企业对广告、研发两种产品差异化策略的有效投入方式,探究不同地区、不同所有制快速消费品企业广告、研发投入对盈利能力的影响效果,选取中国快速消费品企业上市公司2012~2017年广告密度、研发强度、主营业务利润率等相关指标,采用面板数据多元回归方法对广告、研发投入与盈利能力的影响关系以及二者的交互作用进行实证检验,还依据样本所在区域、所有制类型进行样本分组回归,探讨不同情况下广告、研发投入对盈利能力影响效果的差异性。研究发现,广告及研发投入均对中国快速消费品企业盈利能力产生显著正向影响,且该影响具有滞后效应;广告及研发投入对快速消费品企业盈利能力有协同促进作用;两种竞争策略对企业盈利能力的影响存在区域差异及企业所有制差异。结果表明,中国快速消费品企业应适度进行广告投入、加强研发投入,同时在快速消费品行业市场化和产权多元改革的过程中,企业需要根据自身情况不断优化广告和研发的投入配置,以寻求自身产品差异化的独特性和企业盈利能力的持续性。

摘要：目前道路声屏障设计以经验设置为主,缺少具体的工作流程规范,导致声屏障实施过程中调整比例大,整体设计质量不易得到保证。文中以实际工程为依托,介绍基于数学模拟的“等声线包络法”及其相应的计算架构,并揭示了道路声学模拟的计算逻辑和内容。经验证,该计算方法操作便捷、简单,计算结果满足工程设计需求,可为进一步规范化道路声学设计提供技术参考,建设者也可根据相应计算成果提升建设质量。

摘要：自主水下航行器(AUV)在任务进行过程中或完成后需通过自主回收实现能源补充与数据下载等操作,是否能进行高效、精准地回收引导决定了AUV的回收效率,成为其能否广泛应用的关键.针对AUV坐落式回收过程中的近距离光学引导定位问题,提出一种基于深度学习的单双目位姿测量算法.首先,面向恶劣的水下光学成像条件,结合暗通道先验去雾和YOLO v9目标检测网络,实现一种可适应不同水质、光照强度且鲁棒性强、可靠性高的引导光源提取算法.同时,针对回收过程中的特征匹配问题,设计一种不依赖于AUV速度的全向特征匹配算法,实现3D-2D特征匹配.此外,针对坐落式回收典型的多阶段引导特点,分别基于PnP原理和SVD分解设计面向不同阶段的单、双目引导定位算法.最后,基于多次仿真和实物实验,验证算法在精确位姿估计方面的可行性和有效性.