Determination of Slip Length in Couette Flow Based on an Analytical Simulation Incorporating Surface Interaction

An analytical simulation based on a new model incorporating surface interaction is conducted to study the slip phenomenon in the Couette flow at different scales. The velocity profile is calculated by taking account of the micro-force between molecules and macro-force from the viscous shearing effect, as they contribute to the achieve- ment of the slip length. The calculated results are compared with those obtained from the molecular dynamics simulation, showing an excellent agreement. Further, the effect of the shear rate on the slip is investigated. The results can well predict the fluid flow behaviors on a solid substrate, but has to be proved by experiment.

A Displacement Based Analytical Model to Determine Residual Stress Components in a Finite Elastic Thin Plate with Hole-Drilling Method

In order to measure the residual stress components in an elastic thin plate, the hole-drilling strain-gage method has been used. This method enables to determine the relation between the magnitudes and directions of the principal stresses and the strain relaxation about the hole. In the existing analytical models based on stress field, the formulations associated with the hole-drilling method are based on the assumption of an infinite plate, this may cause some errors for a finite plate and it’s difficult to validate these solutions by FE methods. Furthermore, in the composite, the displacement field is continuous but the stress field is not necessarily continuous, the displacement field based method has to be used. In the present paper an analyt-ical model based on a displacement field described by a function with coefficients to determine for a finite round thin plate is presented. The coefficients used in the displacement field are independent on the three residual stress components, and they are determined by minimization of the internal strain energy during the hole-drilling process. Once the coefficients in the dis-placement field are determined, three strains measured in three radial directions are utilized to determine the three residual stress components. The proposed analytical model can be also adapted to infinite plate by assuming that the diameter of the round plate tends to infinite.

THE ANALYTICAL SOLUTIONS BASED ON THE CONCEPT OF FINITE ELEMENT METHODS

On the basis of the concept of finite element methods, the rigorous analytical solutions of structural response in terms of the design variables are researched in this paper. The spatial trusses are taken as an example for the solution of the analytical expressions of the explicit displacements which are proved mathematically; then some conclusions are reached that are useful to structural sensitivity analysis and optimization. In the third part of the paper, a generalized geometric programming method is sugguested for the optimal model with the explicit displacement. Finally, the analytical solutions of the displacements of three trusses are given as examples.

Component-Based Software Trustworthiness Fuzzy Analytic Hierarchy Process Model

For a more accurate and comprehensive assessment of the trustworthiness of component-based soft- ware system, the fuzzy analytic hierarchy process is introduced to establish the analysis model. Combine qualitative and quantitative analyses, the impacts to overall trustworthiness by the different types of components are distinguished. Considering the coupling relationship between components, dividing the system into several layers from target layer to scheme layer, evaluating the scheme advantages disadvantages by group decision-making, the trustworthiness of a typical J2EE structured component-based software is assessed. The trustworthiness asses model of the software components provides an effective methods of operation.

Teaching Effectiveness of Integrating Task-based Approach into Inorganic and Analytical Chemistry Course

From the perspective of students,the effectiveness of task-based approach in In-organic and Analytical Chemistry course were summarized.The strength and weak points of TBA were analyzed,and the specific suggestions for obtaining better effect were put forward.The result showed a satisfactory achievement and unexpected result in showing the effectiveness of this teaching model.Not only could this TBA enhance student's overall knowledge of discipline but also cultivate students' multi-dimensional competence:competence in searching literatures, communication and management,autonomous,co-operative and reflective learning,and competence in analyzing and problem-solving,as well as improving their language expression ability,and skills in using multi-media and internet technology into their academic course learning and research.The implication of this research on the classroom teaching practice will shed light on the future teaching reform of other courses in China.

A two-dimensional fully analytical model with polarization effect for off-state channel potential and electric field distributions of GaN-based field-plated high electron mobility transistor

In this paper, we present a two-dimensional （2D） fully analytical model with consideration of polarization effect for the channel potential and electric field distributions of the gate field-plated high electron mobility transistor （FP-HEMT） on the basis of 2D Poisson＇s solution. The dependences of the channel potential and electric field distributions on drain bias, polarization charge density, FP structure parameters, A1GaN/GaN material parameters, etc. are investigated. A simple and convenient approach to designing high breakdown voltage FP-HEMTs is also proposed. The validity of this model is demonstrated by comparison with the numerical simulations with Silvaco-Atlas. The method in this paper can be extended to the development of other analytical models for different device structures, such as MIS-HEMTs, multiple-FP HETMs, slant-FP HEMTs, etc.

Model Analytics辅助的智能放疗计划建模

目的:利用瓦里安公司开发的Model Analytics(MA)工具减少人工处理RapidPlan模型离群值的繁琐和主观因素导致模型构成的不确定性,评估MA工具在效率、改善统计学参数及模型优化效果等方面的表现。方法:(1)选取81例优质计划导入RapidPlan系统并建立初始模型;(2)将初始模型上传MA进行自动分析统计,根据报告提示对离群值进行批量统计学确认,比较模型验证前后统计学指标的变化;(3)利用20例测试病例评估统计学确认前后Rapid Plan模型的剂量学表现,并与原临床计划比较。结果:MA只需几分钟便可得到构成模型计划的几何学、剂量学等特征统计,5轮分析共找出8个股骨头剂量学离群值,分别高于各自预测范围上限的11.11%、5.88%、5.56%、5.56%、5.00%、5.26%、5.56%和5.88%,R^2由0.32提高至0.45;仅用一轮分析便找出所有3个膀胱几何和剂量学离群值,其中几何离群值分别高于均值62.22%或低于均值55.35%,剂量学离群值高于预测范围上限3.33%,处理完离群值后,R^2由0.35升至0.37。测试计划表明,Rapid Plan计划质量显著优于人工计划(P<0.05),使用验证前后的模型可分别降低股骨头剂量23.15%和27.55%,降低膀胱剂量8.14%和6.79%。结论:使用MA工具可快速获取模型构成计划的整体描述,并准确查找出模型中的离群值,从而提高智能放疗计划建模的效率,但统计学确认对模型的剂量学表现影响不大。

Characterization of the sequence spectrum of DNA based on the appearance frequency of the nucleotide sequences of the genome——A new method for analysis of genome structure

The nucleotide (base) sequence of the genome might reflect biological information beyond the coding sequences. The appearance frequencies of successive base sequences (key sequences) were calculated for entire genomes. Based on the appearance frequency of the key sequences of the genome, any DNA sequences on the genome could be expressed as a sequence spectrum with the adjoining base sequences, which could be used to study the corresponding biological phenomena. In this paper, we used 64 successive three- base sequences (triplets) as the key sequences, and determined and compared the spectra of specific genes to the chromosome, or specific genes to tRNA genes in Saccharomyces cerevisiae, Schizosaccharomyces pombe and Escherichia coli. Based on these analyses, a gene and its corresponding position on the chromosome showed highly similar spectra with the same fold enlargement (approximately 400-fold) in the S. cerevisiae, S. pombe and E. coli genomes. In addition, the homologous structure of genes that encode proteins was also observed with appropriate tRNA gene(s) in the genome. This analytical method might faithfully reflect the encoded biological information, that is, the conservation of the base sequences was to make sense the conservation of the translated amino acids sequence in the coding region, and might be universally applicable to other genomes, even those that consisted of multiple chromosomes.

Endpoint temperature prediction of molten steel in RH using improved case-based reasoning

An improved case-based reasoning （CBR） method was proposed to predict the endpoint temperature of molten steel in Ruhrstahl Heraeus （RH） process. Firstly, production data were analyzed by multiple linear regressions and a pairwise comparison matrix in analytic hierarchy process （AHP） was determined by this linear regression＇s coefficient. The weights of various influencing factors were obtained by AHP. Secondly, the dividable principles of case base including ＂0-1＂ and ＂breakpoint＂ were proposed, and the case base was divided into several homogeneous parts. Finally, the improved CBR was compared with ordinary CBR, which is based on the even weight and the single base. The results show that the improved CBR has a higher hit rate for predicting the endpoint temperature of molten steel in RH.

Integration of Decision－Support and Knowledge－Based Techniques in a Problem－Solving Strategy for Sel

The limitations of traditional approaches to selection problems are examined. A problemsolving strategy is presented in which decision-support and knowledge-based techniques play complementary roles. An approach to the representation of knowledge to support the problem-solving strategy is presented which avoids commitment to a specific programming language or implementation environment. The problem of choosing a home is used to illustrate the representation of knowledge in a specific problem domain. Techniques for implementation of the problem-solving strategy are described. Knowledge elicitation techniques and their implementation in a development shell for application of the problem-solving strategy to any selection problem are also described.

The singularity in the state-based peridynamic solution of uniaxial tension

We solve the local uniaxial tension of an infinite rod in the framework of non-ordinary state-based peridynamics.The singular solutions of stress and displacement are acquired.When the influencing range of the window function approaches zero,these two solutions will return to the solutions of the classical elasticity.The analysis shows that the singularities of the solutions stem from such a feature of the window function that must be represented by a rapidly decreasing function in physics.Contrary to the classical elasticity,the stress solution of peridynamics is smoother than the displacement solution.In addition,a criterion used to select the window function is proposed in this paper.

革命老区振兴发展的挑战、机遇与路径——基于“5D”分析框架的视角

革命老区振兴发展对促进区域协调发展和实现共同富裕具有重要意义。在现有研究基础上,本文提出包含“密度、距离、分割、异质和数字化”的“5D”分析框架,并以此为视角分析革命老区振兴发展的挑战、机遇与路径,指出革命老区振兴发展面临的挑战是“远距离、高分割、低密度”导致的空间不经济,机遇是数字经济的快速发展与“数字化”普惠性、“红色绿色古色”等比较优势和后发优势彰显及其高“异质”潜力、多重利好优惠政策叠加及支持全面化体系化。最后,本文提出革命老区着眼“5D”发力的振兴发展路径,即提升密度,促进人口集中、产业集聚、土地集约;缩短距离,加速各种要素及人员的交流交往交融;消除分割,提升城乡区域市场一体化程度;突出差异,增强特色产业产品的不可替代性;加快数字化,发挥数字技术在降低“远距离、高分割、低密度”负面效应和放大“异质性”正面效应中的积极作用,实现虚实融合发展。

基于AHP的丽水市森林康养村产业资源评价探究

为探索森林康养村及其产业资源评价体系的构建,文章基于层次分析法(AHP)建立了一套森林康养村产业资源评价体系。以自然资源康养价值、人文资源康养价值、配套服务水平和产业运营水平为准则层,对丽水市11个森林康养村进行了应用分析,验证了评价体系的可靠性,并对丽水市森林康养村产业资源的评价方法、开发利用和发展路径提出了建议,以期为森林康养村的高质量建设与可持续性发展提供参考依据。

石化产业基地生态脆弱性评价研究

绿色高效的石化产业基地是生态经济协调发展的重要内容。基于石化产业基地和生态环境相关特性,联合熵权法、模糊层次分析法、德尔菲专家打分法,构建石化产业基地生态环境脆弱性评价指标体系及模型。考虑到评价过程中的不确定性因素,构建基于蒙特卡洛模拟法的生态脆弱性评价模型,并选取连云港石化产业基地进行实证分析,结果表明:“十三五”期间,连云港石化产业基地生态环境脆弱性水平呈递减趋势,计及随机因素的评价模型表现出较强的预测能力,所构建指标体系的科学性得以验证,可为改善我国特殊区域生态环境脆弱性提供参考。

层次分析法中判断矩阵应用的场景化教学设计——以供应商综合评价为例

判断矩阵是层次分析法的核心,在多因素综合评价决策中有着重要应用。然而,现有关于判断矩阵的教学,忽略了一致性检验未通过应当如何重新构建的问题,致使学生难以形成系统认知,进而影响学生的实际应用。文章根据学生对判断矩阵的学习与掌握逻辑,从判断矩阵的概念、性质、构建、检验与调整等知识点进行了系统化梳理,并通过编制的“供应商综合评价”案例,特意设置一些有违一致矩阵性质的数据,让学生体会判断矩阵的构造原则、检验步骤和调整思路,加深对判断矩阵的构建与检验要点的理解,能熟练应用判断矩阵解决多因素综合决策问题。

公立医院互联网诊疗服务质量评价指标体系构建

目的:构建公立医院互联网诊疗服务质量评价体系,为开展高质量互联网诊疗服务提供参考依据。方法:通过文献研究确定互联网诊疗服务体系的框架和指标池,选取相关领域专家18人作为咨询对象,应用德尔菲法进行两轮专家函询,通过层次分析法确定权重,构成最终指标体系。结果:构建了含一级指标3项、二级指标8项和三级指标24项的公立医院互联网诊疗服务质量评价体系。一级指标按照权重大小依次为可靠性(0.565)、有效性(0.242)和一致性(0.193);二级指标权重最高的前3个分别为诊疗系统安全性(0.270)、诊疗合规性(0.221)和医疗质量一致性(0.119);三级指标权重最高的前3个分别为患者个人隐私保护(0.105)、药品安全管理(0.095)和诊疗数据安全性(0.092)。结论:通过德尔菲法和层次分析法构建的公立医院互联网诊疗服务质量评价体系具有一定的科学性和可靠性,可以为后续开展公立医院互联网诊疗服务质量评价提供有力参考和依据。

“教科融合,学以致用”引领下分析化学课程立体化教学实践

分析化学作为药学专业的基础课,教学中应着眼于创新型和服务型药学人才的培养,尽早强化学生分析化学研究思维的训练和应用实践能力的培养,调动学生对专业的热爱,帮助他们树立对国家与社会的责任感。分析化学课程剖析科研案例,构建研究型学习模式,实现教科融合;建立阶梯式实践教学体系,帮助学生提升从认知到实践的能力,达到学以致用。教学效果表明,研究型学习、阶梯式实践、素质拓展的三维立体化分析化学教学实践体系,实现了知识传授与价值引领的统一,促进了新时代复合型药学创新人才的培养。

靶场训练环境构设效果评估方法研究

目的针对靶场基地化训练战场环境构设效果难以定量评估的实际情况,研究定量评估方法,开展效果评估,辅助支撑改进环境构设方案筹划与课目实施。方法分析环境构设的内容,确定效果评估的对象,构建环境构设效果评估指标体系,采用层次分析法计算权重取值,采用专家打分法确定指标取值,最终得出效果评估值,并给出环境构设效果等级。结果以某次基地化训练实践活动为例,通过以上方法评估战场环境构设活动效果,验证了该评估方法的可行性。结论该评估方法实际可行,提供了环境构设效果定量评估的思路,对改进战场环境构设活动有较强的指导意义。

观察启发式教学模式在“仪器分析实验”教学中的实践

基于问题为导向的教学方法,构建了观察启发式教学模式。以凝胶渗透色谱分析为例,更新实验内容,将科学前沿引入课堂中。通过实验课上学生观察仪器和教师问题启发,带动了学生自主协作完成实验操作和数据处理,进而提高了学生的分析测试能力、创新能力和学习自信,为将来进入工作和科研岗位打下坚实的基础。

产出导向背景下分析化学实验“四位一融入”教学模式探索

基于产出导向的教育理念,我们将“四位一融入”教学模式引入到分析化学实验教学过程中,定位培养体系、线上教学资源、实验操作内容和学生达标情况,自然融入课程思政内容,采用线上线下混合式教学,充分利用现代信息化技术,探索分析化学实验课程教学的新模式。该模式提倡以学生为中心,通过启发式教学,提升学生对课程知识的综合运用能力,培养学生发现并提出问题、分析问题与解决问题的能力,加强学生实践能力、创新精神和爱国情怀的培养,使学生具备良好的科学素养。