Demonstration on the indexes design of gravity satellite orbit parameters in the low-low satellite-to-satellite tracking mode

Combining with the exigent demand of the development of satellite gravimetry system in China, aiming at the determination of technical indexes of gravity satellite orbit parameters, on the basis of the numerical experiments and results analysis, the design indexes of gravity satellite orbit height, inter-satellite range and the orbit inclination are analyzed and calculated, and the issues towards twin gravity satellites such as coherence requirement of the orbit semi-major axes, control requirement of the pitch angle and time interval requirement to keep twin satellites formation in mobility are diseussed. Results show that the satellite orbit height is 400 km to 500 km, the inter-satellite range is about 220 km, the satellite orbit inclination is between polar orbit and sun-synchronous orbit, the semi-major axes difference of twin satellites orbit is within ± 70. 146 m, the pitch angle of twin satellites is about 0.9 degree, and the time interval to keep twin satellites formation in mobility is 7 days to 15 days.

Research on Energy Efficiency Design Index for Sea-going LNG Carriers

This paper describes the characteristics of liquefied natural gas （LNG） carriers briefly. The LNG carrier includes power plant selection, vapor treatment, liquid cargo tank type, etc. Two parameters fuel substitution rate and recovery of boil of gas （BOG） volume to energy efficiency design index （EEDI） formula are added, and EEDI formula of LNG carriers is established based on ship EEDI formula. Then, based on steam turbine propulsion device of LNG carriers, mathematical models of LNG carriers＇ reference line value are established in this paper. By verification, the EEDI formula of LNG carriers described in this paper can provide a reference for LNG carrier EEDI calculation and green shipbuilding.

Development of an Energy Efficiency Design Index for Inland Vessels of Bangladesh

More than 10000 different types of ship ply the waters of Bangladesh all year round,but the performance of these ships in terms of CO2 emission is not known and regulations related to energy efficiency of inland waterway ships remain nonexistent.This paper attempts to assess the present situation of inland class vessels in terms of Energy Efficiency Design Index(EEDI).With the use of a developed database of inland vessels in Bangladesh,EEDI reference lines for different types of inland vessels in Bangladesh were established and then compared with those of other countries.The present EEDI of existing inland vessels was investigated.Results indicate that most of the existing vessels do not meet the current EEDI baseline.Hence,new guidelines are necessary to achieve EEDI compliance in the near future.Some recommendations were proposed for improving CO2 emissions,with the socioeconomic and technical factors in Bangladesh taken into consideration.

Analysis and Design of the Globoidal Indexing Cam Mechanism

We first design and analyze the contour surface of the globoidal indexing cam with the aid of computer, and then do optimum design according to the requirements of dynamics. Finally, we discuss the problem of the pressure angle of the globoidal indexing cam mechanism in detail and put forward a new concept of equivalent pressure angle.

The Problems Being Faced for Establishing Index Futures Transaction and the Contract Design

The article deeply and systematically probed into a series of problems being faced for establishing index futures transaction in China. Drawing on the successful experiences of other relative countries and according to Chinese real conditions, the author chooses Shanghai composite index as subject-matter, and has designed an index futures contract that accord with the situation of China.

Design of Structural Left-handed Material based on Topology Optimization

An effective method to design structural Left-handed material（LHM） was proposed. A commercial finite element software HFSS and S-parameter retrieval method were used to determine the effective constitutive parameters of the metamaterials, and topology optimization technique was introduced to design the microstructure configurations of the materials with desired electromagnetic characteristics. The material considered was a periodic array of dielectric substrates attached with metal film pieces. By controlling the arrangements of the metal film pieces in the design domain, the potential microstructure with desired electromagnetic characteristics can be obtained finally. Two different LHMs were obtained with maximum bandwidth of negative refraction, and the experimental results show that negative refractive indices appear while the metamaterials have simultaneously negative permittivity and negative permeability. Topology optimization technique is found to be an effective tool for configuration design of LHMs.

Optimal design of the link lengths for a planar parallel manipulator

This paper addresses geometry design of a new kind of 2-DOF parallel manipulator actuated horizontally by linear actua- tors. The first step of the optimum design involves developing a non-dimensional structure of the planar 2-DOF parallel manipulator. The global conditioning index, global velocity index, global stiffness index and global payload index of the 2-DOF parallel manipu- lators are investigated, and the geometrical parameters without dimension are determined with respect to the specification on per- formances. Finally, based on the optimum non-dimensional result, the optimum dimensional parameters are achieved which is suit- able for the desired workspace. The optimum methodology of this paper is convenient and can be extended to other parallel mecha-

自动控制辅助设计软件Auto-Design

就自动控制辅助设计软件Auto-Design的功能和使用方法做了较为详细的描述,该软件的使用主要是为了提高自控人员的工作效率,减少重复性劳动。

Developing and Applying a Ship Operation Energy Efficiency Evaluation Index Using SEEMP: a Case Study of South Korea

The CO2 emission reduction policy of the International Maritime Organization(IMO)recommends that the operation of ships,managed by maritime transport companies,should be energy-efficient.An evaluation method that can determine how successfully a ship implements the energy efficiency plan is proposed in this study.To develop this method,the measures required for energy-efficient ship operations according to the Ship Energy Efficiency Management Plan(SEEMP)operational guidelines were selected.The weights of the selected measures,which indicate how they contribute to the energy-efficient operation of a ship,were derived using a survey based on the analytic hierarchy process(AHP)method.Consequently,using these measures and their weights,a new evaluation method was proposed.This evaluation method was applied to shipping companies in South Korea,and their ship operation energy efficiency indices were derived and compared.This evaluation method will be useful to the government and shipping companies in assessing the energy efficiency of ship operations.

基于Design-Expert的UHPC强度及收缩率计算模型研究

为实现关键配比参数调整下超高性能混凝土(UHPC)的性能指标控制并得到各性能之间的相互影响规律,利用软件Design-Expert分析了UHPC的主要性能影响因素,基于主要因素对鮑罗米(Bolomy)公式进行了修正,建立了关于UHPC抗压强度、收缩率的计算模型。结果表明:对UHPC抗压强度、收缩率影响较大的三个配比因素分别为水胶比、胶砂比、粉煤灰掺量;基于主要影响因素,利用Design-Expert对UHPC配合比进行了优化,得到了抗压强度≥176 MPa,且收缩率≤320μm·m-1的UHPC试件;通过主要影响因素构建了Bolomy抗压强度及收缩率计算模型,并由计算数据与实验数据对比分析可知,修正后的Bolomy计算模型,可准确反映出抗压强度及收缩率与各主要影响因素之间的关系。

Digital Ecological Design of River Landscapes in Urbanization

By comparing landscape patterns of suburban and urban rivers in the same flow path, and analyzing patch indexes of urban river landscapes, corresponding sustainable eco-design strategies were proposed, ecodesign theory system and eco-restoration design techniques were coupled, so as to explore new digital eco-design means of urban river landscapes by targeting at regional ecological consistency.

社会主义现代化强国评价指标体系的建构逻辑

全面建成社会主义现代化强国,必须明确社会主义现代化强国的概念要点,进而把握其核心要义、构成要素与评价要求,探求构建社会主义现代化强国评价指标体系的可行路径。本文旨在立足国内外现代化强国评价指标体系研究基础,把握时代发展趋势,结合我国实际情况,严格遵循“目标导向与问题导向、理论研究与实践创新、国际通用与各地适用、动态分析与静态剖析、技术可行与数据可比、数量指标与质量指标”六个相统一的构建原则,提炼设计出一套科学系统、行之有效的社会主义现代化强国评价指标体系。全面落实社会主义现代化强国评价指标体系,必须强化评价衡量标准、优化评价监测机制、转化评价结果运用,才能稳中有进全面建成社会主义现代化强国。

Accuracy design of ultra-low residual reflection coatings for laser optics

Refractive index inhomogeneity is one of the important characteristics of optical coating material, which is one of the key factors to produce loss to the ultra-low residual reflection coatings except using the refractive index inhomogeneity to obtain gradient-index coating. In the normal structure of antireflection coatings for center wavelength at 532 nm, the physical thicknesses of layer H and layer L are 22.18 nm and 118.86 nm, respectively. The residual reflectance caused by refractive index inhomogeneity（the degree of inhomogeneous is between -0.2 and 0.2） is about 200 ppm, and the minimum reflectivity wavelength is between 528.2 nm and 535.2 nm. A new numerical method adding the refractive index inhomogeneity to the spectra calculation was proposed to design the laser antireflection coatings, which can achieve the design of antireflection coatings with ppm residual reflection by adjusting physical thickness of the couple layers. When the degree of refractive index inhomogeneity of the layer H and layer L is-0.08 and 0.05 respectively, the residual reflectance increase from zero to 0.0769% at 532 nm. According to the above accuracy numerical method, if layer H physical thickness increases by 1.30 nm and layer L decrease by 4.50 nm, residual reflectance of thin film will achieve to 2.06 ppm. When the degree of refractive index inhomogeneity of the layer H and layer L is 0.08 and -0.05 respectively, the residual reflectance increase from zero to 0.0784% at 532 nm. The residual reflectance of designed thin film can be reduced to 0.8 ppm by decreasing the layer H of 1.55 nm while increasing the layer L of 4.94 nm.

Structural Indexing for 3D Solid Digital Library

In a very large digital library that support computer aided collaborative design, an indexing process is crucial whenever the retrieval process has to select among many possible designs. In this paper, we address the problem of retrieving important design and engineering information by structural indexing. A design is represented by a model dependency graph, therefor, the indexing problem is to determine whether a graph is present or absent in a database of model dependency graphs. we present a novel graph indexing method using polynomial characterization of a model dependency graph and on hashing. Such an approach is able to create an high efficient 3D solid digital library for retrieving and extracting solid geometric model and engineering information.

Asynchronous Observer Design for Switched Linear Systems: A Tube-Based Approach

This paper proposes a tube-based method for the asynchronous observation problem of discrete-time switched linear systems in the presence of amplitude-bounded disturbances.Sufficient stability conditions of the nominal observer error system under mode-dependent persistent dwell-time(MPDT)switching are first established. Taking the disturbances into account, a novel asynchronous MPDT robust positive invariant(RPI) set and an asynchronous MPDT generalized RPI(GRPI)set are determined for the difference system between the nominal and disturbed observer error systems. Further, the global uniform asymptotical stability of the observer error system is established in the sense of converging to the asynchronous MPDT GRPI set, i.e., the cross section of the tube of the observer error system. Finally, the proposed results are validated on a space robot manipulator example.

生成式AI在民族纹样设计中的实验研究

基于生成式人工智能(AI)的民族纹样设计实验研究,旨在为艺术设计师拓展纹样设计方法,促进纹样艺术的传承与发展。优选Stable Diffusion和触手AI两种AI生成技术进行实验与比较,采用定性与定量相结合的分析方法对实验结果进行综合评价。实验结果表明,Stable Diffusion生成的纹样能较好地传承民族纹样的基因,艺术性与创造性兼具,符合民族纹样的艺术设计需求,但图像质量较低;触手AI生成的纹样创新性较好、图像质量高,但容易偏离原始纹样,不能满足艺术设计的内容需求。实验有助于生成式AI深度应用在民族纹样等传统纹样设计中,推动传统纹样的现代设计转化。

基于Geomagic Design X的弧面分度凸轮逆向建模

以弧面分度凸轮为例,利用激光扫描仪测量了弧面分度凸轮的三维几何数据,阐述了弧面分度凸轮点云的拼接方法,使用曲面拟合、曲线混合和曲面放样等功能分段创建了弧面分度凸轮的工作廓面,在通过曲面剪切和曲面缝合功能最终创建了弧面分度凸轮的三维实体模型。该方法对创建弧面分度凸轮的三维实体模型提供了一种切实可行的方案,具有较好的应用价值。

基于力学性能指标与耐久性能指标联合的夯土改性配比优化设计方法

素土强度低、耐久性差且各改性材料掺量往往由工匠凭经验大致确定,导致夯土表面时常容易开裂剥落,故应根据现场土质状况以及合理试验方法来设计夯土改性配比。现有研究大都局限于单一性能指标最优的配比,而现实中夯土既要考虑针对多项力学性能指标与耐久性能指标的同步优化,还要考虑不同地域与气候条件下各指标的重要性不同。另外,现有研究仅能确定若干预设配比中的最优组,而非改性材料预设掺量范围内的最优配比。为此,文章提出一种基于力学性能指标与耐久性能指标联合的夯土改性配比优化设计方法,其包括:(1)土料选用原则与土质鉴定方法;(2)考虑夯土多性能指标的综合赋权方法;(3)基于加权评分和回归分析的夯土改性配比综合比选与优化方法。文章方法通过调整指标权重筛选出适应指标重要性不同时的夯土改性配比,并通过优化设计获得各改性材料预设掺量范围内的最优配比。最后通过设计实例证明了文章方法的确可得到最优的夯土改性配比。

浙江省中小学教育质量监测的迭代发展:从健康体检走向实践指导

本文报告了浙江省教育质量监测从“专业支持”到“自主监测”的迭代发展历程,体现出了浙江省教育质量监测从“健康体检”走向“实践指导”的价值导向。文章从构建“学生发展+成长环境”的评价指标框架、基础指标+自主观测点的设计依据这两个方面介绍浙江教育质量监测指标体系的系统设计;从组合分析、模型构建、专题深入和国际比较四个方面介绍浙江在专题分析方面的创新思路;从揭示学生成长机制、聚焦学习品质及影响机制、透视学业负担的实质、推动学校教学管理转型、改善家庭“软环境”五个方面阐述浙江教育质量监测的结论、发现及相关实践指导,体现了浙江教育质量监测的实践透视能力、基层发展立场与实践指导取向。

Kind of Fuzzy Method Determining Index Weight on Multi-Objctive Decision Making

Based on fuzzy characteristic of dicision-making thought, matrix of priority relation has been introduced and blurrized. A kind of fuzzy method, which is to determine the index weight on multi-objective decision making, has been put forward by means of the sequence root method for analysis of hierarchical process (AHP). Using this method an example which is to define the index weigbt on multi-objective decision making in thc scheme optimization of mine design has been given.