大蛇沟钨矿床是东秦岭杨斜—丰北河金钨成矿带一处典型的石英脉型钨矿床,矿体赋存于杨斜片麻岩套的NE—NEE向构造破碎带内。LA-ICP-MS锆石U-Pb定年结果显示,赋矿含斑眼球状斜长片麻岩的加权平均年龄为(434.2±1.6) Ma (MSWD=0.022,n...大蛇沟钨矿床是东秦岭杨斜—丰北河金钨成矿带一处典型的石英脉型钨矿床,矿体赋存于杨斜片麻岩套的NE—NEE向构造破碎带内。LA-ICP-MS锆石U-Pb定年结果显示,赋矿含斑眼球状斜长片麻岩的加权平均年龄为(434.2±1.6) Ma (MSWD=0.022,n=24),表明原岩形成于早志留世。地球化学研究表明:岩石属于高钾钙碱性准铝质I型花岗岩类,相对富集Rb、Ba、K、Pb、Sr等大离子亲石元素和轻稀土元素(LREE),亏损Nb、Ta、P、Ti等高场强元素和重稀土元素(HREE),具岩浆弧岩浆岩特征。此外,高Sr、高Sr/Y和La/Yb、低Y和低Yb及弱Eu正异常等特征参数,与典型埃达克岩一致;推测岩浆源于加厚下地壳石榴石角闪岩的部分熔融,形成于早古生代商丹洋向北秦岭板块俯冲的活动大陆边缘弧环境。展开更多
The bubble growth and detachment behavior in the bottom blowing process were investigated. Four multi-hole nozzle configurations with different opening ratios were assessed experimentally using high-speed photography ...The bubble growth and detachment behavior in the bottom blowing process were investigated. Four multi-hole nozzle configurations with different opening ratios were assessed experimentally using high-speed photography and digital image processing. For these configurations, the experiments reveal that the bubble growth consists of a petal-like stage, an expansion stage and a detachment stage. The petal-like shape is qualitatively described through the captured images, while the non-spherical bubbles are analyzed by the aspect ratio. The bubble size at the detachment is quantified by the maximum caliper distance and the bubble equivalent diameter. Considering the dependence on the opening ratio, different prediction models for the ratio of maximum caliper distance to hydraulic diameter of the nozzle outlet and the dimensionless bubble diameter are established. The comparative analysis results show that the proposed prediction model can accurately predict the bubble detachment size under the condition of multi-hole nozzles.展开更多
For cooled 320 × 240 detector with staring focal plane array, a novel middle infrared athermal optical system is presented. The system is composed of 5 spherical lenses. The materials of lenses are silicon and ge...For cooled 320 × 240 detector with staring focal plane array, a novel middle infrared athermal optical system is presented. The system is composed of 5 spherical lenses. The materials of lenses are silicon and germanium. The optical parameters and modulation transfer function （MTF） are investigated. The system has the diffraction limited image quality and stable image plane from -30 ℃ to 70 ℃. The characteristic parameters of the system are as follows：flnumber of 4, cold shield efficiency of 100%, spectrum region of 3.7-4.8 μm and transmissivity of 80%. The system has the merits of simple structure, low price, and it is easy to machining.展开更多
In the study cyanobacterial strains were isolated from different sites of Hizoop rivers, Koya-Iraq and identified according to their morphological characters by using microscope, two genera which were in filamentous f...In the study cyanobacterial strains were isolated from different sites of Hizoop rivers, Koya-Iraq and identified according to their morphological characters by using microscope, two genera which were in filamentous form identified as Chroococcus sp. and Lyngbya sp.. After identification of genera their optimum growth condition studied by using the effect of temperature and pH to their dry weight. In the result, the optimum temperature and pH for both filamentous cyanobacteria were 25 ℃ and pH 7.5. Both cyanobacterial strains were extracted with ethanol, methanol and diethyl ether at various concentrations （0.2 g/mL, 0.1 g/mL, 0.005 g/mL） which exhibited the antibacterial activities against Staphylococcus aureus, E. coli and B. subtilus. Inhibition activities of the two cyanobacterial extracts were more effective at high concentration against the tested pathogens at the low concentration, especially those ofLyngbya sp. The higher inhibition zone showed with extract by ethanol.展开更多
文摘大蛇沟钨矿床是东秦岭杨斜—丰北河金钨成矿带一处典型的石英脉型钨矿床,矿体赋存于杨斜片麻岩套的NE—NEE向构造破碎带内。LA-ICP-MS锆石U-Pb定年结果显示,赋矿含斑眼球状斜长片麻岩的加权平均年龄为(434.2±1.6) Ma (MSWD=0.022,n=24),表明原岩形成于早志留世。地球化学研究表明:岩石属于高钾钙碱性准铝质I型花岗岩类,相对富集Rb、Ba、K、Pb、Sr等大离子亲石元素和轻稀土元素(LREE),亏损Nb、Ta、P、Ti等高场强元素和重稀土元素(HREE),具岩浆弧岩浆岩特征。此外,高Sr、高Sr/Y和La/Yb、低Y和低Yb及弱Eu正异常等特征参数,与典型埃达克岩一致;推测岩浆源于加厚下地壳石榴石角闪岩的部分熔融,形成于早古生代商丹洋向北秦岭板块俯冲的活动大陆边缘弧环境。
基金Project(51676211)supported by the National Natural Science Foundation of ChinaProject(2015zzts044)supported by Innovation Foundation for Postgraduate of Central South University,ChinaProject(2017SK2253)supported by the Key R&D Plan of Hunan Province,China
文摘The bubble growth and detachment behavior in the bottom blowing process were investigated. Four multi-hole nozzle configurations with different opening ratios were assessed experimentally using high-speed photography and digital image processing. For these configurations, the experiments reveal that the bubble growth consists of a petal-like stage, an expansion stage and a detachment stage. The petal-like shape is qualitatively described through the captured images, while the non-spherical bubbles are analyzed by the aspect ratio. The bubble size at the detachment is quantified by the maximum caliper distance and the bubble equivalent diameter. Considering the dependence on the opening ratio, different prediction models for the ratio of maximum caliper distance to hydraulic diameter of the nozzle outlet and the dimensionless bubble diameter are established. The comparative analysis results show that the proposed prediction model can accurately predict the bubble detachment size under the condition of multi-hole nozzles.
文摘For cooled 320 × 240 detector with staring focal plane array, a novel middle infrared athermal optical system is presented. The system is composed of 5 spherical lenses. The materials of lenses are silicon and germanium. The optical parameters and modulation transfer function （MTF） are investigated. The system has the diffraction limited image quality and stable image plane from -30 ℃ to 70 ℃. The characteristic parameters of the system are as follows：flnumber of 4, cold shield efficiency of 100%, spectrum region of 3.7-4.8 μm and transmissivity of 80%. The system has the merits of simple structure, low price, and it is easy to machining.
文摘In the study cyanobacterial strains were isolated from different sites of Hizoop rivers, Koya-Iraq and identified according to their morphological characters by using microscope, two genera which were in filamentous form identified as Chroococcus sp. and Lyngbya sp.. After identification of genera their optimum growth condition studied by using the effect of temperature and pH to their dry weight. In the result, the optimum temperature and pH for both filamentous cyanobacteria were 25 ℃ and pH 7.5. Both cyanobacterial strains were extracted with ethanol, methanol and diethyl ether at various concentrations （0.2 g/mL, 0.1 g/mL, 0.005 g/mL） which exhibited the antibacterial activities against Staphylococcus aureus, E. coli and B. subtilus. Inhibition activities of the two cyanobacterial extracts were more effective at high concentration against the tested pathogens at the low concentration, especially those ofLyngbya sp. The higher inhibition zone showed with extract by ethanol.
