Design Issues for Use of Solid State Transmitter Radars in the Terminal Airspace

Abstract

利用Power Designer建立Use Case图

介绍了标准的、面向对象的图形化建模语言UML和如何利用PowerDesigner建立UseCase图。

Evidence-based Landscape Design of University Campus:Relationship Between Characteristics of Outdoor Environments and Actual Uses of Students

Several studies have shown a positive relationship between high quality outdoor environments and users’health.Education of agricultural professionals also demands high quality outdoor environments in order to promote students’wellbeing,which in turn supports scientific researches.This study analyzed relationship between students’actual uses and campus outdoor environments,identified what environmental characteristics that students prefered,how they used and why they participated in the outdoor activities.The results could be used as guidance of campus design and management.Investigation of three universities in Harbin provided 686 valid questionnaires.The results suggested that health awareness effectively promoted students’use frequencies of outdoor environments.Environment with"natural"and"cultural"characteristics,especially undulating landform,vibrant plants and landmarks in a serpentins design style attracted more uses.Female students showed more preferences on social interaction activities than males.Students who had good economic consumption levels and participated in outdoor activities frequntly in childhood prefered to join all the kinds of activities after university enrollment.

Factors Affecting DMO’s Website Use Intention, and Visiting Intention: A SEM Model on the Impact of E-Destination Image and DMO’s Website Design

The aim of this study is to identify and analyze ways to increase usage of destination website and motivate website visitors’intention to actually visit the destination.The sample population is South Koreans who visit the VisitBritain website,the homepage of Britain’s national tourism agency.The data for this study were collected by a self-participated online survey on the blog of VisitBritain Korea,which is directly linked to the VisitBritain Korea website.Using structural equation modeling,six hypotheses were tested.The results show that the destination image on the destination marketing organization(DMO)website,quality of the destination website design including three dimensions(information quality,system quality,and service quality),and customers’satisfaction formed by high quality of the website design have a significant impact on website visitors’use intention and increase their visiting intention to the destination.Based upon the results of the analysis,managerial implications and areas for future research are proposed.

IMPACT OF RETROFITTING ENERGY-EFFICIENT DESIGN STRATEGIES ON ENERGY USE OF EXISTING COMMERCIAL BUILDINGS:COMPARATIVE STUDY OF LOW-IMPACT AND DEEP RETROFIT STRATEGIES

This article discusses cnergy-ficicnt rtfitting design strategics for commercial office buildings,and cxamincs thcir ffect on energy consumption.The objective of the rescarch was to study how to intcgrate passive design stratcgics and cnergy-efficient building systems to improve building performancc,and reduce the cncrgy consumption of existing buildings in three different climate types(cold,mixed and hot climates).First,propertics of existing buildings were analyzed based on national CBECS database to detcrminc typical charactcristics of office buildings located in Chicago,Baltimore and Phoenix,including size,building envelope treatment and building systems.Then,fourteen diffrent prototypes were developed,varying the building shape and orientation to represent different building stock,and cncrgy modcling was conducted to cstablish energy usage baselinc.Multiplc design con-sidcrations were investigated bascd on cxtensivc cncrgy simulations and modeling;where low-impact and decp retrofits were considered.Low-impact stratcgics included improvements to the building cnvelope,lighting systems and optimization of HVAC systems opcration(without upgrading heating and cooling cquipment).Decp cnergy rctrofits also included improvements to building envclopc and lighting,and con-sidered changcs and improvements to HVAC systems(spccifically,integration of radiant systcms).Energy modeling was conducted for all prototypes,and results were obtained for the bascline(current energy usagc),and energy usage considering low-impact design stratcgics and decp rctrofts.A total of 126 cnergy modcls was devcloped,simulated and analyzed,providing a dataset that captured cnergy usage for investigated scenarios.The comparative analysis of simulation results was used to determine how specific techniqucs lead to energy savings in different climatc types,as well as for buildings of various shapes and oricntations.

Prediction of compressive strength of cement mortars with fly ash and activated coal gangue

The pozzolanic activity of coal gangue, which is calcining at 500 to 1 000 ℃, differs distinctly. The simplex-centroid design with upper and lower bounds of component proportion is adopted to study the compressive strength of mortars made with ternary blends of cement, activated coal gangue and fly ash. Based on the results of a minimum of seven design points, three special cubic polynomial models are used to establish the strength predicating equations at different ages for mortars. Five experimental checkpoints were also designed to verify the precision of the equations. The most frequent errors of the predicted values are within 3%. A simple and practical way is provided for determining the optimal proportion of two admixtures when they are used in concrete.

Hydrogen-based direct reduction of industrial iron ore pellets:Statistically designed experiments and computational simulation

As part of efforts to reduce anthropogenic CO_(2) emissions by the steelmaking industry,this study investigated the direct reduction of industrially produced hematite pellets with H_(2) using the Doehlert experimental design to evaluate the effect of pellet diameter(10.5-16.5 mm),porosity(0.36-0.44),and temperature(600-1200℃).A strong interactive effect between temperature and pellet size was observed,indicating that these variables cannot be considered independently.The increase in temperature and decrease in pellet size considerably favor the reduction rate,while porosity did not show a relevant effect.The change in pellet size during the reduction was negligible,except at elevated temperatures due to crack formation.A considerable decrease in mechanical strength at high temperatures suggests a maximum process operating temperature of 900℃.Good predictive capacity was achieved using the modified grain model to simulate the three consecutive non-catalytic gas-solid reactions,considering different pellet sizes and porosities,changes during the reaction from 800 to 900℃.However,for other temperatures,different mechanisms of structural modifications must be considered in the modeling.These results represent significant contributions to the development of ore pellets for CO_(2)-free steelmaking technology.

Discussion on the application of the concept of environmental protection and energy saving in the design of building water supply and drainage

With the current,our country social economy rapid development,people's living standard and quality of life and therefore have got improved,at the same time,it is the concept of environmental protection and energy saving is also enhanced value,many fields in our country environmental protection and energysaving concept can be seen in the application,especially the application in building water supply and drainage design more widely,to protect the environment,to maximize the use of limited resources,how to reasonable use of water resources in building water supply and drainage construction,above is current the paper mainly discusses the problems in the construction field,this paper based on environmental protection and energy-saving concept,discusses its application in the building water supply and drainage design,for your reference.

Design and Analysis of a Dual Rotor Turbine with a Shroud Using Flow Simulations

This paper describes the flow simulation of a dual rotor, three-bladed wind turbine module with a shroud to determine its performance. The parameters that were evaluated are the effects of adding a second rotor, wind speed, distance between the two rotors, the size of the front rotor and the shroud. The results were obtained by using the Solid Works 2015 flow simulation program. Also, the benefits and cost issues for wind generating systems are illustrated.

A Study of Design Optimization Using Response Surface Analysis and Fabricaiton MEMS Probe Tip

In semiconductor manufacturing process, probe station that is testing equipment is important. Inspection step is for detecting defects on semiconductor before the packaging. Probe card is a part of probe station and contains probe tip that contacts to semiconductor. Through probe tip, it can inspect defects of semiconductor. In this paper, optimization method is used with response surface analysis to design MEMS type probe tip. And fabricating probe tip uses maskless lithography, electro-plating and lapping process.

The Use of Remote Sensing and Landscape Metrics to Analyze Land Use Evolution in Rural Areas of the Municipality of Passo Fundo/RS(Brazil)

The use of remote sensing in the design of land use mapping allows analyses of landscape evolution during a certain period of time which helps studies in a global scope.The objective of this study is to identify and analyze changes in characteristics of rural land use in the municipality of Passo Fundo,located in the state of Rio Grande do Sul,Brazil,during the years 2001 and 2020,through images taken from the Landsat TM-7 and TM-8 satellites.Methodologically,satellite images were classified by supervised methods,generating thematic maps,and taking into account the following groups:tillage(growing area),forest,exposed soil and water resources.Results demonstrated that the process of connecting agricultural crop patches went from 5.495 in 2001 to a figure of 10.812 in 2020,thus having an increase of 96%.

PASSIVE DESIGN TECHNIQUES APPLIED TO GREEN BUILDINGS AS AN AESTHETIC AND SPATIAL DESIGN CONCEPT

1.INTRODUCTION The emergence of environmental problems as major social issues throughout the world has prompted sustainable development efforts in a wide range of areas,including industry,construction,and transportation,followed by the execution of numerous studies and policies.The concept of sustainable development has been dealt with in earnest in the construction field since the Declaration of Interdependence for a Sustainable Future at the 18th Chicago Convention of UIA in 1993.This Declaration included tasks to be implemented with respect to green buildings,such as the recycling of resources,application of energy-efficient designs,and utilization of natural energy in addition to the application of sustainable designs.As part of green building practices,countries around the world have been implementing various green building certification standards,such as LEED,GBCC,CASBEE,and BREEAM.

SPACE CARGO TRANSPORT BAGS THROUGH MEMBRANE WATER TREATMENT ELEMENTS TO SPACE ARCHITECTURE BUILDING ELEMENT:A TOTAL PRODUCT SUSTAINABILITY AND LIFE CYCLE DESIGN OPTIMIZATION EXPERIMENT

The CTB Water Wall project is a maximal product life cycle utilization concept study by members of the space architecture design community.Its function is to demonstrate a human space activity Cargo Transport Bag(CTB)that becomes a primary water recycling membrane element after delivery of cargo,and then a permanent architectural building block for sustainable space habitation after its use in water treatment is complete.As such,it is intended as an experiment in radical life cycle product optimization in an extremely mass-constrained application environment(human space operations).It also introduces some fundamentally interesting concepts in architectural use of waste materials in extreme environments.Finally,it is in some ways a simple,tactile and visual demonstration of how far sustainable product design can be taken,if the motivation and technical justification are present.

The Principle of Square Hole Machining and It＇s Tooling Structure Design

In order to meet the rapid needs of processing square hole in mechanical equipment, the paper expounds the square hole processing method： planetary wheel method, and analyze the principle of tooling structure and process with computer graphics parameters design. The results that, as long as the appropriate parameters, using the above method not only can punch the square hole, can also be processed triangle, the five angle and hexagonal regular polygon holes. The square hole processing method can provide theoretical basis and engineering reliable reference for related engineering and technical personnel.

基于一阶谓词逻辑的结构设计规范表示方法

目前,基于BIM模型的合规性审查采用人工方式,工作量繁重且自动化程度低,开展自动合规性审查研究具有重要意义。在结构设计领域能够有效支撑规范知识表示与推理并支持设计审查自动化的设计规范表达方法有待开发。基于一阶谓词逻辑,通过转译《混凝土结构设计规范》中的设计条款,提出一种结构设计规范规则表达和推理方法。该方法可实现将半结构化设计规范条款转换为结构化知识并支持灵活查询与推理,通过“谓词定义”和“函数定义”转译设计规范中语言类、表格类和计算公式类设计条款,提出两种规范条款谓词定义方式。对于语言模糊类、表后注释类和条款补充类的设计条款给出转译解决方案。提出的方法有效地解决了传统一阶谓词对于结构设计条款表示不充分和不精确的问题,进而为设计规范的计算机表达提供一种参考方法。

小型模块式轻水堆燃料组件临界热流密度研究进展

小型模块化反应堆(SMR)在“双碳”大背景下具有广阔的应用前景,对实现能源低碳化转型和能源技术变革等方面具有重要意义。它与常规轻水堆(压水堆和沸水堆)相比堆芯设计差异大,主要表现在小型堆运行功率低、压力低、流速低、堆芯高度低以及功率分布更畸形等,从而导致水冷SMR燃料组件临界热流密度(CHF)研究面临更多难点和挑战。本文综述了CHF机理模型研究、经验关系式研究、子通道分析程序开发等三个方面的发展现状,分析了小型模块式轻水堆CHF研究的特点和难点,并以清华大学研发的一体化全功率自然循环小型压水堆NHR200-Ⅱ为例,介绍了其临界热流密度分析的关键方法研究。

一种安全攸关嵌入式系统需求追踪方法

嵌入式系统在航空、航天、核能及交通等安全攸关领域中的广泛应用,使得保障其安全性至关重要.需求可追踪是安全攸关领域标准的基本要求,也是安全性分析与保障的重要前提.当前可追踪性的研究主要集中在需求与代码之间,缺乏需求与设计间可追踪性的研究,而且建立的追踪信息精确性和完整性不高,无法有效地应用于安全攸关领域.针对这一问题,该文提出了一种基于谓词逻辑的需求追踪方法,可以实现嵌入式系统需求内部横向追踪关系和需求与系统设计间纵向追踪关系的自动推导与检验,并通过两种广泛使用的标准语言SysML和AADL分别对系统需求与设计进行建模.首先,定义了一个基于谓词逻辑的形式系统描述制品间的追踪信息,分别给出了SysML需求的横向追踪关系和纵向追踪关系的语义,然后,基于语义模型给出了追踪关系的自动推导与检验规则,用以建立精确、完整的需求追踪关系,基于这些追踪关系可以有效地支持嵌入式系统的安全性分析以及系统的维护与演化.最后,通过一个案例分析说明了该文需求追踪方法的有效性和可行性.

CFD技术在泵装置水力优化设计中的应用

介绍了CFD技术在水泵装置水力设计过程中的作用、预测泵装置损失的方法及泵装置整体模拟技术。CFD整体模拟技术已应用于南水北调东线工程灯泡贯流泵装置研究中，获得了较好的研究成果。基于CFD技术，应用整体数值模拟和模型试验相结合的研究方法，对我国南水北调工程低扬程泵站科研和设计水平的提高产生深远和积极的影响。

黑龙江省玉米区域性农业生产数学模型的建立及应用

本文根据在黑龙江省31个县、市进行的多年玉米农业生态联合试验,并运用双重组合设计原理进行模型挂接,建立了黑龙江省玉米区域性农业生产数学模型。初步揭示了积温、降水、土壤肥力及农肥、化肥对玉米产量的影响程度及相互间的变化规律,并应用模型对玉米产量形成过程进行了模拟和预测。