Room-temperature mechanical properties of Cu50Zr40Ti10-xNix（0≤x≤4,mole fraction,%） bulk metallic glasses （BMG） with aspect ratios in the range of 1：1-2.5：1 and loading rates in the range of1×10^-5-1×...Room-temperature mechanical properties of Cu50Zr40Ti10-xNix（0≤x≤4,mole fraction,%） bulk metallic glasses （BMG） with aspect ratios in the range of 1：1-2.5：1 and loading rates in the range of1×10^-5-1×10^-2s^-1were systematically investigated by room-temperatureuniaxialcompression test.In the condition of an aspect ratio of 1：1, the superplasticity can be clearly observed for Cu50Zr40Ti10BMG when the loading rate is1×10^-4s^-1, while for Cu50Zr40Ti10-xNix（x=1-3, mole fraction, %） BMGs when the loading rate is1×10^-2s^-1. The plastic strain （εp）, yielding strength （σy） and fracture strength （σf） of the studied Cu-based BMGs significantly depend on the aspect ratio and the loading rate. In addition, theσyof the studied Cu-based BMGs with an aspect ratio of 1：1 is close to the σfof those with the other aspect ratios when the loading rate is1×10^-2s^-1. The mechanism for the mechanical response to the loading rate and the aspect ratiowas also discussed.展开更多
Systematic experimental work was conducted to investigate the solid acceleration length in a 16m long circulating fluidized bed riser with fluid cracking catalyst particles over a wide range of operating conditions. A...Systematic experimental work was conducted to investigate the solid acceleration length in a 16m long circulating fluidized bed riser with fluid cracking catalyst particles over a wide range of operating conditions. A more feasible method is proposed to determine the acceleration length from the measured axial profiles of pressure gradient (or apparent solid holdup). With this new method and large amount of experimental data, a clear picture on the variation of the acceleration length with both solid circulating rate and superficial gas velocity is obtained.It is found that the acceleration length increases generally with increasing solid flow rate and/or decreasing gas velocity. However, the trend in variation of the acceleration length with operating conditions are quite different in different operation ranges. Reasonable explanations are suggested for the observed variation patterns of acceleration length.展开更多
AIM： To study the role of macrophage inflammatory protein （HIP）-2 in liver resection-induced acceleration of tumor growth in a mouse model of hepatic metastasis. METHODS： After a 50% hepatectomy, 1×10^5 CT26....AIM： To study the role of macrophage inflammatory protein （HIP）-2 in liver resection-induced acceleration of tumor growth in a mouse model of hepatic metastasis. METHODS： After a 50% hepatectomy, 1×10^5 CT26.WT cells were implanted into the left liver lobe of syngeneic balb/c mice （PHx）. Additional animals were treated with a monoclonal antibody （HAB452） neutralizing HIP-2 （PHx＋mAB）. Non-resected and non-mAB-treated mice （Con） served as controls. After 7 d, tumor angiogenesis and microcirculation as well as cell proliferation, tumor growth, and CXCR-2 expression were analyzed using in- travital fluorescence microscopy, histology, immunohisto- chemistry, and flow cytometry. RESULTS： Partial hepatectomy increased （P〈0.05）the expression of the HIP-2 receptor CXCR-2 on tumor cells when compared with non-resected controls, and markedly accelerated （P〈 0.05） angiogenesis and metastatic tumor growth. Neutralization of HIP-2 by HAB452 treatment significantly （P〈 0.05） depressed CXCR-2 expression. Further, the blockade of MIP-2 reduced the angiogenic response （P〈 0.05） and inhibited tumor growth （P〈 0.05）. Of interest, liver resection-induced hepatocyte proliferation was not effected by anti-HIP-2 treatment. CONCLUSION： HIP-2 significantly contributes to liver resection-induced acceleration of colorectal CT26.WT hepatic metastasis growth.展开更多
This article reports the results of researches by definition of optimum schemes of accommodation and density standings of tomatoes in 2009-2011 in conditions of Tashkent area of Republic Uzbekistan. Experiences were s...This article reports the results of researches by definition of optimum schemes of accommodation and density standings of tomatoes in 2009-2011 in conditions of Tashkent area of Republic Uzbekistan. Experiences were spent with domestic sorts Uzbekistan and Shark Yulduzi. The following schemes of accommodation and plants of density standing were tested： 70×30 cm and 90×23 cm at density of standing of 47,619 plants/hectares; 70×35 cm and 90×27 cm, 40,816 plants/hectares; 70×40 cm and 90×31 cm, 35,774 plants/hectares. The area of one plant feeding was 0.21, 0.245 and 0.28 ms. Schemes of accommodation and the area of plant feeding within the limits of the tested parameters do not render essential effect upon speed of plant development. Some acceleration （for 1-2 days） introductions into flowering are noted only at increase in the area of plant feeding with 0.21 ms up to 0.28 m^2. It was established that granting to plants of the greater feeding area as due to increase in distance between plants in the lines, and increases in row width strengthens growth of an elevated vegetative part of plants, especially due to increase amount of lateral branches. The greatest general and commodity harvest and the largest fruits sort ＂Uzbekistan＂ forms at density of standing in 40,816 plants/hectares, at schemes 90×27 cm and 70×35 cm, and more compact sort ＂Shark Yulduzi＂ at density of standing of 47,619 plants/hectares and the scheme 90×23 cm.展开更多
文摘为克服现行规范计算高速公路加速车道长度采用确定性方法的缺点,提出了一种基于概率方法的加速车道长度计算模型.首先,获取6条加速车道上223辆小客车和86辆货车的时空分布数据,计算了车辆的速度和加速度,确定了车辆加速度随速度线性递减模型.然后根据车辆的速度与加速度特性,认为货车为计算加速车道长度的不利车型.基于货车的速度与加速度数据,建立了加速车道变速段长度的概率计算模型.结果表明,利用可靠度方法计算加速车道长度,比确定性方法计算加速车道长度更加接近车辆实际运行特性.当主线设计速度为100和120km/h时,加速车道需求长度分别为300和430 m.
基金Projects(50874045,51301194)supported by the National Natural Science Foundation of ChinaProject(2144057)supported by the Beijing Natural Science Foundation,China
文摘Room-temperature mechanical properties of Cu50Zr40Ti10-xNix（0≤x≤4,mole fraction,%） bulk metallic glasses （BMG） with aspect ratios in the range of 1：1-2.5：1 and loading rates in the range of1×10^-5-1×10^-2s^-1were systematically investigated by room-temperatureuniaxialcompression test.In the condition of an aspect ratio of 1：1, the superplasticity can be clearly observed for Cu50Zr40Ti10BMG when the loading rate is1×10^-4s^-1, while for Cu50Zr40Ti10-xNix（x=1-3, mole fraction, %） BMGs when the loading rate is1×10^-2s^-1. The plastic strain （εp）, yielding strength （σy） and fracture strength （σf） of the studied Cu-based BMGs significantly depend on the aspect ratio and the loading rate. In addition, theσyof the studied Cu-based BMGs with an aspect ratio of 1：1 is close to the σfof those with the other aspect ratios when the loading rate is1×10^-2s^-1. The mechanism for the mechanical response to the loading rate and the aspect ratiowas also discussed.
基金the National Natural Science foundation of China (No. 29928005).
文摘Systematic experimental work was conducted to investigate the solid acceleration length in a 16m long circulating fluidized bed riser with fluid cracking catalyst particles over a wide range of operating conditions. A more feasible method is proposed to determine the acceleration length from the measured axial profiles of pressure gradient (or apparent solid holdup). With this new method and large amount of experimental data, a clear picture on the variation of the acceleration length with both solid circulating rate and superficial gas velocity is obtained.It is found that the acceleration length increases generally with increasing solid flow rate and/or decreasing gas velocity. However, the trend in variation of the acceleration length with operating conditions are quite different in different operation ranges. Reasonable explanations are suggested for the observed variation patterns of acceleration length.
基金Supported by the grants of the Research Committee the Medical Faculty of the University of Saarland,No.HOMFOR-A/2003/1
文摘AIM： To study the role of macrophage inflammatory protein （HIP）-2 in liver resection-induced acceleration of tumor growth in a mouse model of hepatic metastasis. METHODS： After a 50% hepatectomy, 1×10^5 CT26.WT cells were implanted into the left liver lobe of syngeneic balb/c mice （PHx）. Additional animals were treated with a monoclonal antibody （HAB452） neutralizing HIP-2 （PHx＋mAB）. Non-resected and non-mAB-treated mice （Con） served as controls. After 7 d, tumor angiogenesis and microcirculation as well as cell proliferation, tumor growth, and CXCR-2 expression were analyzed using in- travital fluorescence microscopy, histology, immunohisto- chemistry, and flow cytometry. RESULTS： Partial hepatectomy increased （P〈0.05）the expression of the HIP-2 receptor CXCR-2 on tumor cells when compared with non-resected controls, and markedly accelerated （P〈 0.05） angiogenesis and metastatic tumor growth. Neutralization of HIP-2 by HAB452 treatment significantly （P〈 0.05） depressed CXCR-2 expression. Further, the blockade of MIP-2 reduced the angiogenic response （P〈 0.05） and inhibited tumor growth （P〈 0.05）. Of interest, liver resection-induced hepatocyte proliferation was not effected by anti-HIP-2 treatment. CONCLUSION： HIP-2 significantly contributes to liver resection-induced acceleration of colorectal CT26.WT hepatic metastasis growth.
文摘This article reports the results of researches by definition of optimum schemes of accommodation and density standings of tomatoes in 2009-2011 in conditions of Tashkent area of Republic Uzbekistan. Experiences were spent with domestic sorts Uzbekistan and Shark Yulduzi. The following schemes of accommodation and plants of density standing were tested： 70×30 cm and 90×23 cm at density of standing of 47,619 plants/hectares; 70×35 cm and 90×27 cm, 40,816 plants/hectares; 70×40 cm and 90×31 cm, 35,774 plants/hectares. The area of one plant feeding was 0.21, 0.245 and 0.28 ms. Schemes of accommodation and the area of plant feeding within the limits of the tested parameters do not render essential effect upon speed of plant development. Some acceleration （for 1-2 days） introductions into flowering are noted only at increase in the area of plant feeding with 0.21 ms up to 0.28 m^2. It was established that granting to plants of the greater feeding area as due to increase in distance between plants in the lines, and increases in row width strengthens growth of an elevated vegetative part of plants, especially due to increase amount of lateral branches. The greatest general and commodity harvest and the largest fruits sort ＂Uzbekistan＂ forms at density of standing in 40,816 plants/hectares, at schemes 90×27 cm and 70×35 cm, and more compact sort ＂Shark Yulduzi＂ at density of standing of 47,619 plants/hectares and the scheme 90×23 cm.
