炸药现场混装技术在爆炸加工中的应用

介绍了国内率先开发成功的适于爆炸加工使用的现场混装低爆速铵油炸药、地面站生产技术及新型铵油炸药现场混装车(BCJX)。BCJX采用独特旋转料仓设计,从根本上解决了粉状铵油炸药现场混装技术难题,开拓了铵油炸药车新品种和新的应用领域。实践证明该项技术安全、高效、低碳,生产的炸药性能良好、完全满足爆炸加工作业要求。     

炸药现场混装技术在爆炸加工中的应用

介绍了国内率先开发成功的适于爆炸加工使用的现场混装低爆速铵油炸药、地面站生产技术及新型铵油炸药现场混装车(BCJX)。BCJX采用独特旋转料仓设计,从根本上解决了粉状铵油炸药现场混装技术难题,开拓了铵油炸药车新品种和新的应用领域。实践证明该项技术安全、高效、低碳,生产的炸药性能良好、完全满足爆炸加工作业要求。     

新型稀释剂在爆炸焊接粉状改性铵油炸药中的应用

针对传统爆炸焊接炸药中加入的稀释剂存在吸湿、污染环境等问题,在粉状改性铵油炸药中加入一种新型稀释剂,研究稀释剂含量和布药厚度对炸药的爆速影响,并进行爆炸焊接实验.结果表明:该稀释剂含量为40％的粉状改性铵油炸药爆速低,爆轰性能稳定,能够满足复合板材爆炸焊接的要求.     

水分含量对改性铵油炸药性能的影响

从水分含量对改性铵油炸药的爆炸性能和贮存期的影响进行了研究。发现水分含量为0.04%～0.20%范围内,对改性铵油炸药的爆速和殉爆距离具有明显影响;在水分含量不大于0.07%的情况下,改性铵油炸药在其贮存期内的爆速及殉爆距离能满足一般工程应用的要求。综合考虑水分对改性铵油炸药爆炸性能及贮存稳定性的影响,水分含量以不大于0.04%为宜。     

水分含量对改性铵油炸药性能的影响

从水分含量对改性铵油炸药的爆炸性能和贮存期的影响进行了研究。发现水分含量为0.04%～0.20%范围内,对改性铵油炸药的爆速和殉爆距离具有明显影响;在水分含量不大于0.07%的情况下,改性铵油炸药在其贮存期内的爆速及殉爆距离能满足一般工程应用的要求。综合考虑水分对改性铵油炸药爆炸性能及贮存稳定性的影响,水分含量以不大于0.04%为宜。     

爆炸焊接用低爆速粉状乳化炸药研究

为降低岩石粉状乳化炸药的爆速,选择了一种HW矿物粉,通过筛混方式将该分散剂与炸药混合,并测定了该分散剂加入量和布药厚度对炸药爆速的影响。结果表明,岩石粉状乳化炸药中掺入44.5%~50%的HW矿物粉时,爆速为1913m/s~2378m/s,经钢与不锈钢板爆炸焊接试验表明,爆炸结合率达100%,可满足金属爆炸焊接用炸药的要求。     

爆炸焊接用低爆速粉状乳化炸药研究

为降低岩石粉状乳化炸药的爆速,选择了一种HW矿物粉,通过筛混方式将该分散剂与炸药混合,并测定了该分散剂加入量和布药厚度对炸药爆速的影响。结果表明,岩石粉状乳化炸药中掺入44.5%⁵0%的HW矿物粉时,爆速为1913m/s50%的HW矿物粉时,爆速为1913m/s²378m/s,经钢与不锈钢板爆炸焊接试验表明,爆炸结合率达100%,可满足金属爆炸焊接用炸药的要求。     

多孔粒状铵油炸药爆炸热化学计算与分析

运用B-W法建立多孔粒状铵油炸药的爆炸反应方程式,依据盖斯定律计算定容爆热,加权法计算爆炸产物的摩尔定容热容,研究计算得出露天多孔粒状铵油炸药的比容为970.10L/kg、爆热为-3840.67kJ/kg、爆温2787K;并讨论分析了氧平衡值对多孔粒状铵油炸药热化学性能的影响情况。     

2007年亚洲太平洋地区爆破技术研讨会(第一轮通知书)

运用B-W法建立多孔粒状铵油炸药的爆炸反应方程式,依据盖斯定律计算定容爆热,加权法计算爆炸产物的摩尔定容热容,研究计算得出露天多孔粒状铵油炸药的比容为970.10L/kg、爆热为-3840.67kJ/kg、爆温2787K;并讨论分析了氧平衡值对多孔粒状铵油炸药热化学性能的影响情况。     

多孔粒状混装铵油炸药爆炸性能试验研究

炸药性能直接影响到爆破的效果,为改善爆破效果,更好地利用炸药的爆炸能,通过现场试验测试混装按油炸药的爆速,得出现场混装铵油炸药最佳配比为柴油占5%,并在最佳配比的条件下,研究了混装按油炸药爆速随装药直径、装药密度及混合后存放时间的变化规律.结果表明,混装铵油炸药爆速随装药直径的增加而增大,当装药直径达到一定值后,爆速趋...     

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.……     

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.     

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.     

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.