共查询到20条相似文献,搜索用时 78 毫秒
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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。 相似文献
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为了提高多孔粒状铵油炸药的爆炸性能和储存性能,在分析国内生产技术现状的基础上,设计了一种固定式多孔粒状铵油炸药生产线生产工艺。该工艺采用热敏热混方法,用复合油相替代单一的柴油,并加入适量的稻糠或木粉调节炸药氧平衡和密度,以提高铵油炸药的混匀度和稳定性,降低产品成本,提高产品综合性能。试验结果表明,改进后的多孔粒状铵油炸药爆炸性能基本能够达到粉状改性铵油炸药的质量水平,兼具了普通多孔粒状铵油炸药与液混式膨化硝铵炸药和改性铵油炸药的优点,具有较好的推广应用前景。 相似文献
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Kamlesh Goel 《Scientometrics》2002,55(2):243-258
An analysis of gender differences in psychology in India provides quantitative and qualitative assessment of R&D output contributed by psychologists with the indication of the trend of growth, skewness, relatedness, co-authorship pattern of productivity. 相似文献
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The system for Metrology in Chemistry in Germany is described. At the national standards level, a network of high-level chemistry
institutes coordinated by the national metrology institute, PTB, provides the primary references for chemical measurements.
A dissemination mechanism employs chemical calibration laboratories accredited within the framework of the German Calibration
Service (DKD). They act as “multipliers” between the national standards level and the user level by providing the user with
calibration means which are traceable to the SI via national standards. Traceability structures in clinical chemistry, electrochemistry,
elemental analysis and gas analysis are described 相似文献
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Natural radioactivity in drinking water was determined in population-based random study of 472 private wells. The mean concentrations of (222)Rn, (226)Ra, (234)U, (238)U, (210)Pb and (210)Po in drilled wells were 460, 0.05, 0.35, 0.26, 0.04 and 0.05 Bq l(-1), and in wells dug in the soil were 50, 0.016, 0.02, 0.015, 0.013 and 0.007 Bq l(-1), respectively. Approximately 10% of the drilled wells exceeded a radon concentration of 1000 Bq l(-1) and 18% a uranium concentration of 15 microg l(-1). The mean annual effective dose from natural radionuclides for a drilled well user was 0.4 mSv and 0.05 mSv for a user of a well dug in the soil. The effective dose arising from (222)Rn was 75% of the total of all natural radionuclides for drilled well users. As regards long-lived radionuclides, (210)Po and (210)Pb caused the largest portion of the effective dose. The dose arising from (238)U, (234)U and (226)Ra was only 8% of the total of all natural radionuclides. 相似文献
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Radiation Protection Dosimetry 相似文献
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Ali KK 《Radiation protection dosimetry》2012,148(3):372-379
Activity concentrations of (226)Ra, (232)Th and (40)K in 45 samples of different building materials used in Iraq were measured using gamma-spectroscopy system based on high-purity germanium detector with an efficiency of 40 %. Radium equivalent activity, air-absorbed dose rate, annual effective dose, external and internal hazard indices and alpha index due to radon inhalation originating from building materials were measured to assess the potential radiological hazard associated with these building materials. The activity concentrations of the natural radionuclides (226)Ra, (232)Th and 40K were found to range from below detection limit (BDL) to 223.7 ± 9, BDL to 93.0 ± 3 and BDL to 343.1 ± 12, respectively. Values of average radium equivalent activity, air-absorbed dose rate, indoor and outdoor annual effective doses, external and internal hazard indices and alpha index ranged from 6.5 to 124.9, 16.2 to 89.5 (nGy h(-1)), 0.08 to 0.44 mSv, 0.02-0.11 mSv, 0.09 to 0.53, 0.13 to 0.69 and 0.03 to 0.62, respectively. These values indicate a low dose. Therefore, the building materials used in the current study are quite safe to be used as building materials. 相似文献
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一、采标工作的主要经验做法和取得的成绩(一)领导重视,机构健全是采标工作的有力组织保证沈阳市在消灭无标生产工作中,先后成立了区、县人民政府消灭无标生产工作领导小组,消灭无标生产工作阶段性完成后,根据国家质检总局要求相继改为标准化工作领导小组,领导小组由主管区长挂帅,各职能部门主要领导参加,为采标工作的开展提供了坚实的组织保证,并纷纷出台了一些保障措施。围绕实施名牌产品战略,市政府明确要求,在评选名牌产品时,产品必须首先采标,然后方可有资格参加名牌产品的评选。我们坚持对申报评选的产品进行跟踪,能够… 相似文献