岩金矿山采空区处理现状及对策

岩金矿山以浅眼留矿法为代表的空场采矿法为主要开采手段，约占50％，每年形成数百万m^3采空区，并绝大多数未进行专门处理。本文介绍数例岩金矿山采空区处理方法及效果与对策，供有关企业参考。     

Crystallization of Polymer-Derived Silicon Carbonitride at 1873 K under Nitrogen Overpressure

The chemical stability of an amorphous silicon carbonitride ceramic, having the composition 0.57SiC·0.43Si₃N₄·0.49C is studied as a function of nitrogen overpressure at 1873 K. The ceramic suffers a weight loss at p _N2 < 3.5 bar (1 bar = 100 kPa), does not show a weight change from 3.5 to 11 bar, and gains weight above 11 bar. The structure of the ceramic changes with pressure: it is crystalline from 1 to 6 bar, amorphous at ∼10 bar, and is crystalline above ∼10 bar. The weight-loss transition, at 3.5 bar, is in excellent agreement with the prediction from thermodynamic analysis when the activities of carbon, SiC, and Si₃N₄ are set equal to those of the crystalline forms; this implies that the material crystallizes before decomposition. The amorphous to crystalline transition that occurs at ∼10 bar, and which is accompanied by weight gain, is likely to have taken place by a different mechanism. A nucleation and growth reaction with the atmospheric nitrogen is proposed as the likely mechanism. The supersaturation required to nucleate α-Si₃N₄ crystals is calculated to be 30 kJ/mol.     

DETERMINATION OF TOTAL NITROGEN IN BARLEY AND MALT BY COMBUSTION METHOD—COLLABORATIVE TRIAL

A combustion method, relying on the Dumas principle, for the determination of total nitrogen in barley and malt, has been collaboratively tested by the Analysis Committee of the European Brewery Convention. Repeatability, r₉₅, and reproducibility, R₉₅, values were 0.063 and 0.116% of dry matter, respectively, for samples with nitrogen contents in the range 1.23 to 1.86% N of dry matter. There was no significant difference between these values for barley and malt. The Analysis Committee approved the adoption of the combustion method for inclusion in Analytica EBC as an alternative method.     

氮对纳米硅氮薄膜品化的影响

在电容式耦合等离子体化学气相沉积系统中，用高氢稀释硅烷和氮气为反应气氛制备纳米硅氮（ｎｃ－ＳｉＮｘ：Ｈ）薄膜结果表明：当Ｎ＿２／ＳｉＨ＿４气体流量比（Ｘｎ）从１增加为４时，薄膜的晶态年从５８％降至１４％，晶粒尺寸从１０ｎｍ降至５ｕｍ，Ｎ／Ｓｉ含量比从０．０３增至０．１２．当Ｘｎ≥５，则生成非晶硅氮（ａ－ＳｉＮｘ：Ｈ）薄膜．当Ｘｎ从１增加为１０时，薄膜暗电导率从１０￣（－５）（Ωｃｍ）￣（－１）降至１０￣（－１１）（Ωｃｍ）￣（－１），具有逾渗行为，这与薄膜的晶态率紧密相关．     

磁控溅射WO3薄膜特性研究

用磁控溅射法制成WO3薄膜,通过改变成膜的溅射参数来改变WO3薄膜的性能.利用XRD分析了样品的粒径大小,研究了成膜工艺参数对气敏元件性能的影响.结果表明,薄膜中WO3晶粒的平均尺寸为17 nm,该传感器对NOx气体有非常好的灵敏度和选择性,对体积分数为1×10-5的NOx气体灵敏度高于50倍,而对其他干扰气体的灵敏度小于2倍.     

雁翎油田注氮气提高采收率工艺技术

在现有的提高采收率方法中,注气驱是应用较广、效果较好的方法,特别是注氮气驱由于其气源广泛、价廉经济、无腐蚀性,以及要求的油藏地质结构特征和原油的物理性质等因素的变化范围广泛等特产,这种提高采收率的方法应用的最为普及,代表了目前提高采收率的发展方向。结合雁翎油田实例,简要介绍了注氮气提高采收率的机理、注气井组建设、制氮工艺及注气后的采油完井方式、方法。     

高水固结尾砂充填采矿充填体合理配比的研究

高水固结尾砂充填采矿是一种新型充填采矿法。试验测定了高水固结尾矿充填体的强度和变形特征；研究分析了影响充填体强度的主要因素、高水充填工艺的特殊要求，以及上向，下向进路开采对充填体强度和稳定性的要求，提出了满足支护强度，工艺及经济需求的充填材料的合理配比范围。     

The effect of beaver ponds on the nonpoint source water quality of a stream in Southwestern Wyoming

Currant Creek, a second order stream in southwestern Wyoming, has three large complexes of beaver ponds midway along its 32 km length. To determine whether these ponds improve the quality of water flowing through them, during spring and summer of 1984 and 1985 water samples were taken upstream from, within, and downstream from the pond complexes. During periods of high flow (i.e. spring runoff), concentrations of suspended solids (SS), total phosphorus (TP), sodium hydroxide-extractable phosphorus (NaOH-P, an index of biologically available P) and total Kjeldahl nitrogen (TKN) were reduced in water flowing through the beaver ponds. During low flow, beaver ponds had less effect on these parameters. Concentrations of nitrate nitrogen (NO₃-N) were reduced during both high and low flows, while concentrations of ortho-phosphate (ortho-P) did not appear to be affected by beaver ponds. Ammonia nitrogen almost always was at the limit of detection. Regression of NaOH-P versus [SS plus ortho-P] suggested that the primary source of NaOH-P was SS. In general, SS explained a large portion of the variation in TP, TKN, and NaOH-P, and often ortho-P was significantly correlated to TP. The increase in the concentration of most parameters below the area with dam complexes appears to reflect input from bank and channel erosion, and export of SS, TP, TKN and NO₃-N from beaver dam complexes was calculated to be less than that from stream sections above or below the dams. Thus the location of dams should be considered before using them to try and improve water quality. The apparent importance of bank and channel erosion as the primary source of nutrients to Currant Creek contrasts with many watersheds in agricultural areas.     

热轧板卷厂集中补脂系统的开发与应用

针对常规自动干油润滑系统补脂时存在的问题，开发了一套新型集中自动补脂润滑系统并应用于韶钢宽中厚板厂，取得了较好的效果。     

注射成型中塑料熔体充填流动的粘度模型研究

对比研究了Cross_Exp 和Cross_WLF两种粘度模型 ,并分别利用这两种模型通过实例模拟研究了熔体粘度的压力依赖性对注射压力模拟的影响