急倾斜薄煤层新型钻采技术

随着多年的开采,越来越多的矿井进入矿井服务年限后期,为了延长矿井服务年限,传统方法较难开采的急倾斜薄煤层开采技术的开发越来越受到关注。本文针对马庄矿枯竭型矿井具体地质条件,介绍了一种急倾斜薄煤层新型钻采技术。通过对坑道钻机的理论研究及技术改造,结合实验室模拟结果,确定了合理的开采工艺,可为条件类似的矿井提供借鉴。     

"Green" route to 6-hydroxy-3-succinoyl-pyridine from (S)-nicotine of tobacco waste by whole cells of a Pseudomonas sp

A new technology for 6-hydroxy-3-succinoyl-pyridine (HSP) production from (S)-nicotine in tobacco waste by whole cells of a Pseudomonas sp. has been developed. When deionized water was used in the transformation reaction as a medium and the initial pH value of reaction mixture was adjusted to 7.0, 1.45 g/L HSP was produced from 3 g/L of nicotine in 5 h with 3.4 g/L of cells in a 5-L flask at 30 degrees C. HSP could be easily purified from the reaction without perplexing separation steps. A quantity of 1.3 g of HSP was recovered without impurity, and the overall yield of HSP was 43.8% (w/w), based on an initial concentration of 3.0 g/L of nicotine in reaction. This biotransformation made it possible to convert nicotine in tobacco wastes with high nicotine content into valuable compounds.     

水平定向钻在铺设燃气管道中的应用

水平定向钻由于具有高精确,高效率,环保,安全等特点,已经越来越受到人们的重视。文章从水平定向钻的设备结构和施工工艺两方面系统地介绍了如何应用水平定向钻铺设燃握气管道。     

果汁二次混浊研究的新进展

二次混浊是目前果汁加工中新的技术难题之一 ,直接影响产品品质。本文分析了果汁中引起二次混浊的因素 ,综述了二次混浊形成机理、调控规律等方面的研究进展 ,并提出了建立果汁加工工艺过程中二次混浊的调控体系的思路     

沙子空心李果干营养成分分析

以沙子空心李果干为研究对象,对其基本营养成分、矿质元素以及氨基酸进行测定与分析。结果表明:沙子空李果干中膳食纤维、灰分、总糖、总酸、总蛋白质、脂肪的含量分别为8.06、1.7、57.4、0.141、0.86、0.2 g/100 g;维生素C与烟酸含量分别为1.22、0.382 mg/100 g;矿质元素含量大小顺序为CaNaFeZnSe,其中Ca含量达到5.33 mg/100 g;检测出16种氨基酸,苏氨酸含量最高为0.87 g/100 g,丙氨酸次之为0.23 g/100 g,酪氨酸最低,含量为0.026 g/100 g,从氨基酸评分中看出沿河沙子空心李的第一限制氨基酸是异亮氨酸,其中必需氨基酸总量/氨基酸总量(essential amino acid to total amino,EAA/TAA)为62.7%,必需氨基酸总量/非必需氨基酸总量(essential amino acid to non-essential amino acid,EAA/NEAA)为1.86,均高于国际粮油组织与世界卫生组织(Food and Argriculture Organization and World Health Oranization,FAO/WHO)提出的理想蛋白质的标准,说明沿河沙子空心李果干中的蛋白质是优质蛋白。     

Polymer-based blue electrophosphorescent light-emitting diodes based on a new iridium(III) diazine complex

Polymer-based blue electrophosphorescent light-emitting diodes are reported by doping iridium(III) diazine complex (DFPPM)₂Ir(pic) (DFPPM = 2-(2,4-difluorophenyl)-pyrimidine, pic = picolinate) in poly(vinylcarbazole) (PVK) as the source of emission. The iridium(III) diazine complex shows sky blue emission with its maximum emission peak at 476 nm originating from an admixture of triplet metal-to-ligand charge-transfer and ligand-centered states. The (DFPPM)₂Ir(pic)-doped device furnishes a maximum external quantum efficiency of 2.2% and power efficiency of 1.9 lm/W at a 10 wt% doping concentration.     

邻苯二甲酸单醇醚钠盐去污性能研究

按ＱＢ５１０８４标准对邻苯二甲酸单月桂醇聚氧乙烯（３）醚酯钠盐（简称ＰＡＥＳ）新型表面活性剂的去污性能进行了系统研究，测定了其在不同浓度、不同温度、不同硬水度中的去污性能，并与两种同类表面活性剂的去污性能进行了对比．结果表明，ＰＡＥＳ是一种去污性能优良的温和型表面活性剂     

肌红蛋白在阴极沉积的Fe3O4-PDDA膜上的固定及其电化学性质研究

利用阴极电解沉积方法在玻碳电极表面制备了具有生物兼容性的Fe3O4-PDDA杂化膜.这种膜对肌红蛋白(Mb)和血红蛋白(Hb)有很强的吸附能力,并能实现它们与电极表面的直接电子传输.采用X射线光电子能谱、原子力显微镜、紫外光谱、电化学阻抗谱和循环伏安等手段对沉积的复合物膜进行了表征,并研究了Mb和Fe3O4-PDDA之间的相互作用力.这种阴极电解沉积制备氧化物-聚合物膜的方法操作简单快捷,可在聚合物基质中现场合成功能性的氧化物膜.因此,在制备性能优良的固定蛋白质的基体材料和制备传感器件方面有很好的应用前景.     

大豆皮水不溶性膳食纤维制备工艺的研究

以大豆皮为原料,用酸法、碱法和酸碱共处理方法制备水不溶性膳食纤维。通过比较,确定了酸法最佳工艺条件为:提取温度100℃、加水量15mL/g大豆皮、提取时间60min、pH值3;碱法最佳工艺条件为:NaOH浓度3%、处理温度50℃、提取时间30min;酸碱共处理法不适合水不溶性大豆皮膳食纤维的制备。     

Sensitive Determination of Bromate in Water Samples by Capillary Electrophoresis Coupled with Electromembrane Extraction

Electromembrane extraction (EME) as a novel sample preparation technique was firstly applied for the purification and enrichment of bromate (BrO₃ ^?) in drinking water prior to capillary zone electrophoresis with capacitively coupled contactless conductivity detection (CZE-C⁴D). BrO₃ ^?, as the primary disinfection by-product of ozonation, could be well separated with the major inorganic anions coexisting in water samples using a 300 mmol L^?1 acetic acid solution as the running buffer. Under the optimum conditions, the calibration curve showed good linearity (r ²?=?0.996), and the limit of detection was down to 0.12 ng mL^?1 with the enrichment factor at 267. The relative standard deviation (RSD) values for peak area and migration time at a spiked concentration of 10 ng mL^?1 of bromate were below 8.8 and 2.5 %, respectively. This proposed EME-CZE-C⁴D method has been successfully applied to analyze bottled drinking water and tap water samples with recoveries in the range of 85~98 %, providing an alternative to the determination of bromate in drinking water.