合理调整主扇运行 提高经济效益

泉沟煤矿原生产能力 0 .2 1Mt α ,1973年开始改扩建 ,1978年正式投产 ,生产水平为 - 115水平。井田面积 8.4m2 ,共有可采煤层七层 ,矿井瓦斯相对涌出量为 4 .4 2 5m3 t,属低瓦斯矿井 ;所有可采煤层均属有爆炸危险煤层 ,煤尘爆炸指数在35～ 4 5 %之间。经过 4 0年的开采 ,矿井煤炭资源逐渐枯竭 ,自 1997年开始矿井进入收缩时期 ,主要以寻找经济煤量为主 ,对边角块段煤柱进行回收。随着采场的不断改变 ,矿井通风系统也不断的变化 ,原有的矿井通风能力不适用矿井生产。先后进行了几次大的通风系统改造 ,取得了较好的经济效益。1　原有矿井通…     

贮氢合金Mg2Ni的燃烧合成

研究了燃烧合成贮氢合金Mg2 Ni的可行性以及保温时间和保温温度对合成产物的影响。结果证实燃烧合成了Mg2 Ni,并且确定Mg Ni的压坯试样的点火温度与Mg Ni系的共晶温度 (5 0 6℃ )很接近。     

RESEARCH ON THE CHAOS DYNAMIC MODEL OF RUNOFF

1.　INTRODUCTIONThestudyonrunoffserialhasbeenconductedwithrandommodelsofrunoffserialforalongtime.Inspiteoftheirapplicationsincertaincircumstances,theapplicabilityofrandommodelsislimitedbecausethephysicalmechanismofrunoffprocessisnotcompletelyrandom.Manyresearchershavefoundthatchaosprocessexistsinriverrunoff,rainingandthundering.Chaosisanidentifyingprocesssimilartorandom.Thestateofchaossystemisalwaysconvergedtoacertainnumberofattractorsinphasespace,andthestudyoforderinrandomnessisaveryimpo…     

GWB5-6C漏电保护柜在平庄西露天矿的应用

针对露天开采电铲、钻机漏电保护存在的问题,提出了解决方案及实施后取得的良好效果。     

立足行业前沿 提升技术优势 上海烟印建设高水准的技术中心

<正>走进上海烟草包装印刷有限公司(以下简称上海烟印)技术中心大楼,让人感受到的不仅是精密的检测仪器、宽敞明亮的实验室,还有别致新颖的包装展示设施、人性舒适的工作环境。与机器轰鸣、紧张作业的印刷车间相比,这里集技术创新与设计创意氛围于一体,完全是上海烟印的"硅谷"。上海烟印是一家有着80多年历史的老牌烟草印刷企业,曾有"远东第一"的美誉。但丰厚的印刷底     

PC600型液压挖掘机存在的问题及改进

通过对小松PC600型液压挖掘机投入生产几年来存在的问题进行统计分析研究,提出整改建议,为完善设备管理及点检制度提供了依据。     

Aliphatic and polycyclic aromatic hydrocarbons in the Xihe River, an urban river in China's Shenyang City: distribution and risk assessment

The characteristics of petroleum hydrocarbons and the risks they pose to the ecosystem were studied in the Xihe River, which is an urban river located in Shenyang, China. High levels of aliphatic hydrocarbons (AHc) and polycyclic aromatic hydrocarbons (PAHs) were observed in the river due to the discharge of wastewater from industrial and municipal facilities for a long period of time. High-molecular-weight hydrocarbons, including unresolved complex mixtures (UCM) of n-alkanes between n-C16 and n-C32 and of PAHs with four to six rings, were the dominant hydrocarbons in the river, particularly in suspended particulate matter (SPM) and sediments. The AHc was mainly from petrogenic sources, whereas PAHs was from both pyrolytic and petrogenic source inputs. Our results suggest that there is a high risk of toxicity for the soils and groundwater of the study area. The overall toxicity in the sediments can be described using the toxic equivalent (TEQ) of dibenzo[a,h]anthracene (DBA) based on benzo(a)pyrene (TEQ(BaP)) and dioxins (TEQ(TCDD)) toxic equivalent concentrations. The TEQ values for benzo(a)pyrene (TEQ(BaP)) and dioxins (TEQ(TCDD)) presented a consistent assessment of sediment PAHs.     

Effects of gene augmentation on the removal of 2,4-dichlorophenoxyacetic acid in a biofilm reactor under different scales and substrate conditions

With a conjugative plasmid pJP4 carrying strain as the donor, two bioaugmentation experiments were conducted in a microcosm biofilm reactor with 2,4-D as the sole carbon source operated in fed-batch mode, and an enlarged lab-scale sequence batch biofilm reactor with mixed carbon sources of 2,4-D and other easily biodegradable compounds, respectively. In the microcosm study under sole carbon source condition, bioaugmentation led to a persistently increased 2,4-D degradation rate in the five operation cycles with enhancement of 13-64%. For the enlarged lab-scale bioaugmentation experiment under mixed carbon source conditions, no enhancement in 2,4-D removal could be observed during start-up period. After a period of operation, biofilm samples from the bioaugmented reactor demonstrated a stronger degradation capacity than the control and showed the presence of a large number of transconjugants. This study indicates that bioaugmentation based on plasmid horizontal transfer is a feasible strategy to establish functional microbial community in a biofilm reactor, and the strong selective pressure of 2,4-D existing alone and persistently was more favorable for the success of gene augmentation.     

Surface profile measurement in white-light scanning interferometry using a three-chip color CCD

White-light scanning interferometry (WLSI) is a useful technique to measure surface profile when a test object contains discontinuous structures or microstructures. A black and white CCD camera is usually utilized to capture interferograms, and a series of corresponding algorithms is used to achieve the profile measurement. However, the color information in the interferograms is lost. A novel profile measurement method that uses phase information in different color channels (red-green-blue) of an interferogram obtained using a three-chip color CCD in WLSI is proposed. The phase values are extracted by a windowed Fourier transform algorithm. Simulation and experimental results are presented to demonstrate the validity of the proposed method.