User’s Relevance of PIR System Based on Cloud Models

Information retrieval (IR) is to find by usingrelevant technology a set of relevant documents to us-er’s queries froma large number of documents . Thisset includes a certain number of documents , whichinclude non-relevant documents asless as possible .Inother words ,the major taskinIRistorealize the rel-evance judgements to query. Relevance is one of thekey concepts in IR.User’s relevanceis some kind of applicabilityforone document to a special user . Documents take onrandomicity and unce…     

Status Evaluation of Loose of Jig Bed Based on Fuzzy Inference System

This paper mainly describes that loose of jig bed affects jig‘‘s separation effect, and the corresponding fuzzy rules were built. Using the evaluating index of jig‘‘s separation effect imperfection (I) and total misplaced material (Cz), it evaluates status of loose of jig bed by fuzzy inference system. Experimental simulation and applications in practice prove the method‘‘s feasibility.     

Evaluation of Mining Titles Based on Option-Pricing Model

1 Introduction Evaluation of mining properties is an estimation of future revenues expected from the exploitation of a given mining property. In general, a mining title pro- ject is the stage of a concession when a feasibility study or pre-feasibility study is finished. In this case, availability of reliable data with regard to engineering, marketing, production, operating and capital costs makes it possible to use quantitative methods such as discounted cash flow (DCF) and analogy sales meth…     

Simulation of Cobalt-Rich Crust’s Crushing Process Based on ANSYS

1 Introduction There are hundreds of millions tons of cobalt- rich crust which contain many metal elements such as cobalt, nickel, silver, copper, gold, platinum and thu- lium on the seabed. Because of its practically strate- gic, economic and political significance, cobalt-rich crust has become a great concern in ocean resource exploitation for every country [1–2]. The business mining system of cobalt-rich crust will probably con- sist of the mining subsystem, lifting subsystem, telemetering…     

The Optimization and Simulation of Crane＇s Arm Frame System Based on MATLAB

臂架系统是门座起重机设计的核心,通过优化臂架系统中各杆件的长度,保证吊重在臂架系统变幅过程中尽量沿近似水平线轨迹的方向运动．运用向量的方法,根据四连杆机构的几何关系计算出了象鼻梁头部的坐标;并运用合理的算法,融入可视化的理念,在MATLAB的环境下计算出了满足设计条件下的各杆件长度;最终将设计结果形成软件．     

Intelligent Forecasting of Sintered Ore’s Chemical Components Based on SVM

Using object mathematical model of traditional control theory can not solve the forecasting problem of the chemical components of sintered ore.In order to control complicated chemical components in the manufacturing process of sintered ore,some key techniques for intelligent forecasting of the chemical components of sintered ore are studied in this paper.A new intelligent forecasting system based on SVM is proposed and realized.The results show that the accuracy of predictive value of every component is mor...     

Chloride Diffusivity Analysis of Existing Concrete Based on Fick’s Second Law

According to the existing concrete core samples obtained in site, chloride concentration and porosity of existing normal hydraulic concrete were measured, and chloride diffusivity in existing hydraulic concrete was studied. By Fick’s second law, the chloride diffusion coefficients in the steady diffusion area were calculated. The chloride diffusion of different mix proportion concrete was tested, and chloride diffusion coefficients and porosities of freshly concrete were measured, moreover, the relationship...     

Characteristics of physical blocking on co-occupant’s exposure to respiratory droplet residuals

Existed evidences show that airborne transmission of human respiratory droplets may be related with the spread of some infectious disease, such as severe acute respiratory syndrome (SARS) and H1N1 pandemic. Non-pharmaceutical approaches, including ventilation system and personal protection, are believed to have certain positive effects on the reduction of co-occupant’s inhalation. This work then aims to numerically study the performances of mouth covering on co-occupant’s exposure under mixing ventilation (MV), under-floor air distribution (UFAD) and displacement ventilation (DV) system, using drift-flux model. Desk partition, as one generally employed arrangement in plan office, is also investigated under MV. The dispersion of 1, 5 and 10 μm droplet residuals are numerically calculated and CO₂ is used to represent tracer gas. The results show that using mouth covering by the infected person can reduce the co-occupant’s inhalation greatly by interrupting direct spread of the expelled droplets, and best performance can be achieved under DV since the coughed air is mainly confined in the microenvironment of the infected person. The researches under MV show that the two interventions, mouth covering and desk partition, achieve almost the same inhalation for fine droplets while the inhalation of the co-occupant is lower when using mouth covering for large droplets.