Investigation on TG n-FinFET Parameters by Varying Channel Doping Concentration and Gate Length

In this paper, a 3D process of a nanometric n-channel fin field-effect transistor (FinFET) is discussed and the impact of variations of the fin parameter, the gate work function, and doping concentration on device characteristics are studied using the ATLAS Silvaco device simulator. Simulation results for various gate lengths are reported and analyzed. As the quantum effects are pronounced in nanoscale devices, we have included these effects in our study and simulation. We have then compared the achieved results to classical simulations to assess their performance limits. Finally, a comparison of our results with recently published data is presented to confirm our study.     

Electrical Characteristics of 8-nm SOI n-FinFETs

This study is aimed at presenting the electrical characteristics of a nanoscale SOI n-channel fin field-effect transistor (FinFET) structure with 8 nm gate length using Al₂O₃ as the dielectric material and their sensitivity to the number of fins and fin-thickness with 3C-SiC material in the channel region. In this work, the numerical simulation tool Silvaco-Atlas is used to simulate the device in three-dimensions and to extract new results concerning the electrical characteristics of the device at room temperature (300 K) in comparison to earlier generations. The threshold voltage, subthreshold slope, transconductance, drain induced barrier lowering, leakage current, on-current, and On/Off current ratio are analyzed. Simulation results show that the higher drain current and transconductance are obtained by increasing the number of fins. The use of a higher value of gate dielectric constant can increase the drain current and improve the leakage current. It is found that reducing the fin-thickness is beneficial in reducing the subthreshold slope, drain induced barrier lowering, and leakage current. It should be highlighted that the achieved results can be useful for further manufacturing processes.     

三维模型化设计浏览软件的特点及其工程应用

以秦山核电三期（CANDU）重水核电站为例，论述了三维模型浏览软件对三维模型化设计所起的重要作用，SmartPlantReview的特点和在大型工程中的应用。     

化工项目风险分析的三维模型

化工项目的风险是人们在决策、投资、建设、生产过程中由环境、自身能力及过程本身不确定性造成的.文章在对化工项目风险分类的基础上,建立起一个包括过程、环境和能力的三维风险分析模型,以帮助化工项目主体识别、分析和防范风险.     

Investigation of Vitamin D2 and Vitamin D3 Hydroxylation by Kutzneria albida

The active vitamin D metabolites 25-OH−D and 1α,25-(OH)₂−D play an essential role in controlling several cellular processes in the human body and are potentially effective in the treatment of several diseases, such as autoimmune diseases, cardiovascular diseases and cancer. The microbial synthesis of vitamin D₂ (VD₂) and vitamin D₃ (VD₃) metabolites has emerged as a suitable alternative to established complex chemical syntheses. In this study, a novel strain, Kutzneria albida, with the ability to form 25-OH−D₂ and 25-OH−D₃ was identified. To further improve the conversion of the poorly soluble substrates, several solubilizers were tested. 100-fold higher product concentrations of 25-OH−D₃ and tenfold higher concentrations of 25-OH−D₂ after addition of 5 % (w/v) 2-hydroxypropyl β-cyclodextrin (2-HPβCD) were reached. Besides the single-hydroxylation products, the human double-hydroxylation products 1,25-(OH)₂−D₂ and 1,25-(OH)₂−D₃ and various other potential single- and double-hydroxylation products were detected. Thus, K. albida represents a promising strain for the biotechnological production of VD₂ and VD₃ metabolites.     

基于逆向工程的三维模型重构

通过手持式三维激光扫描仪获取安全帽表面的点云数据,用逆向工程软件Imageware对点云数据进行处理与曲面重构;利用Creo构造冲击实验模型,再用Ansys Workbench进行冲击实验,随后进行优化分析。结果表明:安全帽应力和变形主要集中在顶部,并向底部逐渐降低;最大应力及变形均位于冲击处,最大应力为0.528 MPa,最大变形为9.852 mm。优化后的模型,其最大应力降低了33.52%,最大应变降低了13.88%。     

三维编织复合材料的力学行为研究现状

关于三维编织复合材料的细观几何模型以及力学性能的研究进展进行了综述,着重阐述了近年来该研究领域的一些学术成果,其中包括三维编织复合材料力学性能的实验和理论研究.实验研究则多以测试各种编织参数和载荷对其力学性能参数的影响规律,而理论研究则侧重介绍细观结构力学模型.最后,总结了目前研究工作存在的问题,并对未来发展趋势做出展望.     

三维缝合复合材料微观力学模型研究进展

三维缝合复合材料由于复杂的微观结构，其力学性能与层合板的力学性能有着本质的区别。许多研究者通过理论分析模型的建立来模拟其真实的内部结构，以达到预测其力学性能的目的。本文综述了近年来提出的一些主要的微观理论分析模型，分析了其存在的优缺点，并以此指导力学工作者合理地选择计算模型，使之能对三维缝合复合材料进行较为精确的力学性能预报。     

三维模型软件PDS在化工设计中的应用

当前,化工企业的规模不断扩大,与之配套的设备也越来越多,这也决定着化工设计任务的繁重。同CAD设计软件相比,新近出现三维模型PDS软件在化工设计领域中的应用日益广泛。通过介绍PDS软件的主要功能模块的内容以及通过具体操作实例,说明该类软件的材料数据库具有强大的兼容性和可操作性。最后简要说明了借助PDS软件进行化工三维模型设计的基本流程和优势。     

复杂花纹子午线轮胎水滑特性仿真研究

基于LS-DYNA非线性有限元分析软件,建立具有复杂胎面花纹的175/65R14子午线轮胎三维有限元模型.通过轮胎径向刚度试验验证所建轮胎有限元模型的有效性,并在此基础上构造轮胎水滑仿真分析模型.使用ALE算法处理轮胎与水流间的流固耦合关系,仿真分析轮胎从静止到水滑现象产生的全过程,获得的轮胎临界水滑速度与经验公式的计算结果具有较好的一致性.3种不同花纹轮胎水滑速度仿真结果在趋势上与预期一致,进一步说明了有限元方法对轮胎水滑特性仿真评价的有效性.     

螺杆式塑化3D打印装置的设计模拟及出丝性能研究

设计了螺杆、机筒、螺旋叶片等结构,建立了螺杆式塑化三维（3D）打印系统,利用Polyflow软件对压力场、速度场、剪切速率进行了数值模拟分析,并对粒状物料3D打印出丝性能进行了研究。结果表明,螺旋叶片结构通过施加轴向力实现了强制喂料;在整个螺杆挤出段上,熔融物料沿挤出方向随螺杆转速的提高压力逐步增加,梯形螺棱设计有利于熔体流动;材料熔融需要通过剪切作用与加热装置热量传递协同作用以降低熔体黏度;螺杆转速从0.1 r/s向1 r/s的变化过程中,丝材直径呈小幅度增加。     

Investigation of Single Event Transients on RingFET using 3D TCAD Simulations

Silicon - In this work, the effect of heavy ion radiation on ringFET structures with gate lengths of 32 nm and 20 nm is explored using 3D TCAD simulations. The sensitive position...     

燃煤烟气细颗粒物团聚技术研究进展

调研了烟气中细颗粒物团聚技术的种类与研究情况,并就团聚技术在燃煤烟气湿法脱硫领域的应用前景进行了讨论。     

管道专业S3D模型设计检验探讨

在三维模型设计日益普及的设计工作中,由于存在一些非模型导出条件和成品,为了保证其与模型的一致性,也为了校核第三方导入模型的设计输入,管道专业引入一种基于设计流程的模型检验机制,从框架定位、设备、管口、管线、管件等方面,校验模型与设计条件的一致性,从而实现管道专业与各相关专业条件、管道专业条件与成品的一致性,保障现场安装...     

UG NX软件在轮胎三维模型设计中的应用

以12.00R20矿用轮胎为例,研究UG NX软件在轮胎三维模型设计中的应用。结果表明：采用UG NX软件,通过常用特征命令（如旋转对象、规律延伸、扫略、修剪片体、面倒圆等）,可以生成轮胎花纹三维模型和轮胎实体模型,快速建立轮胎三维设计模型。该设计方法可有效、准确地表达轮胎设计概念,降低轮胎设计风险,缩短产品开发周期。     

PDS中夹套管三维工程设计实践探讨

夹套管伴热是类似于套管换热器的一种管道伴热形式,因伴热效果均匀而广泛应用于石化、化工等领域。由于其结构的复杂性,夹套管在工厂设计系统(PDS)中的三维工程设计一直存在技术难点。采用一种新的方法,结合工程实例详细论述PDS中如何实现夹套管的三维工程设计。     

Computer Filling Simulation of Injection Molding Based on 3D Surface Model

Computer simulation packages have been successful in predicting filling behavior in extremely complicated geometries, and most of the current numerical solutions are based on a hybrid finite-element/finite-difference scheme and the middle-plane model. This imported model causes some inconvenience during applications. This study introduces surface model as the datum plane, instead of the traditional middle-plane model and additional boundary conditions in the gapwise direction are employed to keep the flows in the surfaces at the same section coordinative. The simulation presented here is compared with the experimental results obtained with instrumented test mold and C-Mold results. It is demonstrated that the present formulation is well suited to handle cavities generated directly by mold design process with computer aided design (CAD) tools.     

A 3D,Compartmental Tumor-Stromal Microenvironment Model of Patient-Derived Bone Metastasis

Bone is a frequent site of tumor metastasis. The bone–tumor microenvironment is heterogeneous and complex in nature. Such complexity is compounded by relations between metastatic and bone cells influencing their sensitivity/resistance to chemotherapeutics. Standard chemotherapeutics may not show efficacy for every patient, and new therapeutics are slow to emerge, owing to the limitations of existing 2D/3D models. We previously developed a 3D interface model for personalized therapeutic screening, consisting of an electrospun poly lactic acid mesh activated with plasma species and seeded with stromal cells. Tumor cells embedded in an alginate-gelatin hydrogel are overlaid to create a physiologic 3D interface. Here, we applied our 3D model as a migration assay tool to verify the migratory behavior of different patient-derived bone metastasized cells. We assessed the impact of two different chemotherapeutics, Doxorubicin and Cisplatin, on migration of patient cells and their immortalized cell line counterparts. We observed different migratory behaviors and cellular metabolic activities blocked with both Doxorubicin and Cisplatin treatment; however, higher efficiency or lower IC50 was observed with Doxorubicin. Gene expression analysis of MDA-MB231 that migrated through our 3D hybrid model verified epithelial–mesenchymal transition through increased expression of mesenchymal markers involved in the metastasis process. Our findings indicate that we can model tumor migration in vivo, in line with different cell characteristics and it may be a suitable drug screening tool for personalized medicine approaches in metastatic cancer treatment.     

仪表三维模型设计在石化工程项目中的应用

仪表三维模型设计在现有工程建设中主要用到的是PDMS软件,PDMS的含义是Plant Design Management System简称PDMS,是由英国AVEVA公司开发的工厂三维设计管理系统,在PDMS中多个专业组可以协同设计以建立一个详细的3D数字工厂模型,每个设计者在设计过程中都可以随时查看其它设计者正在干什么,同时元件信息全部可以存储在参数化的元件库中,PDMS能自动地在元件和各专业设计之间进行碰撞检查,从而在整体上保证设计结果的准确性,有效地避免现场施工过程中发生碰撞引起的设计变更。仪表专业主要在PDMS的设计模块创建三维的仪表电缆桥架及仪表设备模型[1]。     

基于光固化的三维模型自适应切片研究

为了提高光固化3D打印的成型速度,设计一种基于像素变化率的自适应切片算法.该算法能够消除楼梯效应和刻画细小特征,同时提高打印质量与速度.分析了切片该算法的实现过程以及如何取变化率阈值;给出了光固化成型中树脂投射深度的计算方法,最后给出的实例验证了算法的可行性且该算法具有高度普适性.实验结果表明,在保证打印质量的前提下,...