铀矿勘查现状及找矿方向的思考

为结合当前我国西南地区铀矿资源勘查现状,提出下一步找矿方向,该文分析了铀矿成矿的基本情况,提出了几种不同的找矿思路及技术应用方向,一是结合地质学方法找矿,二是采用地球化学法找矿,三是采用地球物理学方法找矿。这些方法与我国西南地区铀矿资源的赋存及成矿远景地质条件极其相符,便于地质勘查工作的顺利开展。希望通过该文的论述,为有关工作实施提供一定启发。     

光石沟铀矿区勘查工程间距的商榷

本文通过对光石沟铀矿区花岗伟晶岩脉型铀矿产出地质背景介绍,矿体特征分析,采用稀空法验算了不同勘查工程间距估算的资源,储量之间的误差,提出了适合该区矿体特征的勘查工程间距,对指导该区下一步揭露工程布置,提高勘查效率具有积极意义。     

广西金鸡盆地铀矿化地质特征及找矿潜力分析

文章对金鸡盆地地质特征、铀矿化特征进行了分析,认为砂岩型铀成矿的关键是盆地沉积环境、盆地构造和铀源,除了注重盆地沉积成岩型铀矿化的勘查研究,还应加强对断裂构造、层间破碎带、蚀变带与铀矿化的关系研究工作,并对铀矿找矿潜力作出初步评价。     

地质矿产勘查及找矿技术初步探讨

众所周知,矿产资源作为自然资源的重要组成,与人类的生产生活密切相关,是我们社会发展的基础,随着我国经济的不断发展,对矿产资源的需求量也在逐渐增加,然而就我国目前的矿产资源来说,与一些国家相比还是处于落后的,最近几年来,我国的地质工作有了显著的发展,然而在仍需要加强对地质矿产的勘查和找矿工作来满足需求量日益增加的社会,因此就急需建立一个完善的科学地质工作体系,提高我国在地质矿产业的自主创新能力,本文从地质矿产勘查的原则出发,结合地质矿产勘查及找矿技术的现状,对地质勘查及找矿技术的应用前景作了相关研究,旨在为完善地质勘查及找矿技术提供参考。     

探讨当前矿产地质勘查技术

就目前来看,矿业已经成为我国国民经济重要支柱,而相应矿产资源已经成为人们生产生活必不可少的资源。因此矿产地质勘查具有紧迫性、重要性。"同位成矿"理论可以解决找矿的重大问题,同时配套新的技术方法可望找到大型、超大型矿床。本文主要对矿产地质勘查理论进行分析、对矿产地质勘查技术方法进行探讨。     

我国主要矿产资源储量增大

正国土资源部日前公布了一份"找矿突破战略行动"年度报告。这一报告显示:2013年度我国油气探明储量保持高位增长,主要固体矿产勘查新增探明资源储量持续增长。国土资源部坚持开源节流并举总方针。国土资源部储量司副司长许大纯指出,全国掀起了新一轮地质找矿高潮,特别是大型油气盆地和矿床的发现为经济发展注入了活力。     

对地质勘查技术原则与方法的探究

随着社会经济的不断发展，无论是人们的日常生活还是我国各行各业的需要，对于矿产资源的依赖程度越来越高。而随着科技的发展，在地质勘查中所采用的勘查技术和方法越来越具有多样性。本文对地质勘查如何找矿进行研究，分析地质勘查技术存在的问题，并制定切实的解决方案，希望可以使地质勘查技术更加完善，从而帮助我国取得更大的经济效益。     

河南将有六大铝土矿勘查基地

在按近期和中长期进行勘查部署后,河南省在未来可形成三门峡新安、洛阳市龙门-荥阳市崔庙、新密-新郑、伊川县白沙登封大金店、禹州、汝州-宝丰等六个铝土矿勘查开发基地。全国矿产资源潜力评价项目办一位负责人说,铝土矿资源潜力评价的这一结果,将为河南这一我国最重要的铝工业基地提供有力的资源支撑。     

中国核电的可持续发展

章阐述了核能是可持续发展的能源,是我国未来国民经济发展的重要支柱的论点,分析了国际核电发展现状,我国核电发展的方针政策、技术路线、现状以及共同关心的几个问题：铀资源问题、核安全问题、核废料问题和核电国产化问题,展望了我国核心电发展的前景,并提出了建议：我国核电站应以现有压水堆核电站为基础,实现国产化、标准化、系列化;快中子增殖堆在我国核电建设中占有十分重要的地位,应大力支持、促进;尽快开始乏燃料后处理厂及其配套设施的建设。     

中国铀矿采冶技术发展与展望

对中国铀矿采冶工业的发展作了全面的回顾,重点介绍了中国铀矿地浸、堆浸、原地爆破浸出技术的研究进展与应用水平;在对中国铀矿采冶形势和存在的问题分析的基础上,结合矿床资源的特点,指出了中国铀矿采冶技术发展的方向。21世纪中国铀矿冶工业面临新的发展机遇和挑战,只有开发新的采、选、冶技术,提高铀资源的利用水平,减少铀矿采冶对环境的影响,才能实现铀矿冶的可持续发展和经济与环境的协调发展。     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

The Research of Anti-Wear Properties of Organomolybdenum Compounds in the Engine Oils

A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

A study of centrifugal cast high boron high speed steel

In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M₂(B,C), (W,Mo)₂(B,C), M₃(B,C), M₂₃(B,C)₆ type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm². The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K₁ mill housing of bar mill.     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

Certification Becomes Important for the I Quality; and Safety Supervision of the Chinese Liquor Sector

The end of 2007, over 200 unit products of more than 80 Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits, beer, wine, yellow wine, fruit syrup wine and others, and cover over 80% of the national top-branded liquor products.……     

Deposition and Coating Properties on CVD Tungsten

Surface characterization and microstructure studies are performed on chemical vapor deposited (CVD) tungsten coating. There is about 2 μm thickness diffusion layer of tungsten in the molybdenum substrate. The thermal shock test shows tungsten coating has good adhesion with molybdenum substrate, but the elements of oxygen and carbon in the tungsten coating have the bad affection to the adhesion. The result of high-temperature diffusion experiment is the diffusion rate from molybdenum substrate to tungsten coating is faster.