期刊文献+
共找到7篇文章
< 1 >
每页显示 20 50 100
Numerical Simulations of Jet Flow Inside Launching Box and Design of Pressure Opening the Covers of Missile Launching Box
1
作者 刘琦 郝继光 +1 位作者 姜毅 陈建伟 《Journal of Beijing Institute of Technology》 EI CAS 2004年第S1期54-57,共4页
Numerical simulations are presented for jet flow inside a launching box. The predictions are based on solutions of the unsteady three-dimensional Reynolds-averaged Navier-stokes equations. Since the pressure opening t... Numerical simulations are presented for jet flow inside a launching box. The predictions are based on solutions of the unsteady three-dimensional Reynolds-averaged Navier-stokes equations. Since the pressure opening the forward cover is given, the pressure opening the backward cover is designed by analyzing the flow field inside the launching box. The κ -ε turbulent model is presented and the structured meshes are used through the whole computational field. 展开更多
关键词 launching box the pressure opening the covers jet flow
下载PDF
Influence of Polar Pressure Transmission Medium on the Pressure Coefficient of Excitonic Interband Transitions in Monolayer WSe_2
2
作者 Shun-yu Zhou Yan-xia Ye +3 位作者 Kun Ding De-sheng Jiang Xiu-ming Dou Bao-quan Sun 《Chinese Physics Letters》 SCIE CAS CSCD 2018年第6期45-49,共5页
The influence of the pressure transmission medium(PTM)on the excitonic interband transitions in monolayer tungsten diselenide(WSe2)is investigated using photoluminescence(PL)spectra under hydrostatic pressure up... The influence of the pressure transmission medium(PTM)on the excitonic interband transitions in monolayer tungsten diselenide(WSe2)is investigated using photoluminescence(PL)spectra under hydrostatic pressure up to 5GPa.Three kinds of PTMs,condensed argon(Ar),1:1 n-pentane and isopentane mixture(PM),and4:1 methanol and ethanol mixture(MEM,a PTM with polarity),are used.It is found that when either Ar or PM is used as the PTM,the PL peak of exciton related to the direct K-K interband transition shows a pressure-induced blue-shift at a rate of 32±4 or 32±1 meV/GPa,while it turns to be 50±9meV/GPa when MEM is used as the PTM.The indirect A-K interband transition presents almost no shift with increasing pressure up to approximatel.y 5 GPa when Ar and PM are used as the PTM,while it shows a red-shift at the rate of-17±7meV/GPa by using MEM as the PTM.These results reveal that the optical interband transitions of monolayer WSe2 are very sensitive to the polarity of the PTM.The anomalous pressure coefficient obtained using the polar PTM of MEM is ascribed to the existence of hydrogen-like bonds between hydroxyl in MEM and Se atoms under hydrostatic pressure. 展开更多
关键词 PTM MEM Influence of Polar pressure Transmission Medium on the pressure Coefficient of Excitonic Interband Transitions in Monolayer WSe2
下载PDF
Monitoring the Cultivated Slope Land in the Three Gorges Reservoir Area Based on Remote Sensing and GIS 被引量:4
3
作者 ZHOU Jieming1, ZHOU Qigang 2, 3 ,HUANG Zhiqin 2, 3, 4 1. The Faculty of Geography and Resources Science, Sichuan Normal University, Chengdu 610066, Sichuan, China 2. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, Sichuan, China +1 位作者 3. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China 4. Information Center of Land and Resources Department of Sichuan Province, Chengdu 610041, Sichuan, China 《Wuhan University Journal of Natural Sciences》 EI CAS 2006年第4期915-921,共7页
By means of combining auto-extraction with manual interpretation, the current distribution information about cultivated land is obtained. The distribution information of 1992 is extracted from the dynamic polygons of ... By means of combining auto-extraction with manual interpretation, the current distribution information about cultivated land is obtained. The distribution information of 1992 is extracted from the dynamic polygons of 2002. The monitoring mini-system of the cultivated slope land is established. In the system, detailed surveys, focused on the resources of cultivated slope land, are carried out. The results indicate that the area of the cultivated slope land is very large. Meanwhile, there are lots of cultivated steep slopes with gradient above 35°. The areas of steep land cultivated had been slowly reduced from 1992 to 2002. At the same time, the pressures of returning farm land to forestry are great in all counties. The conflicts between population growth, insufficient grain supply and stagnant economic development sharpen increasingly. It is inevitable to improve the agricultural structure. 展开更多
关键词 slope land cultivated remote sensing geography information system (GIS) the pressure of returning farm land to forestry Three Gorges Reservoir Area
下载PDF
A new method for evaluating the injection effect of chemical flooding
4
作者 Jian Hou Yan-Hui Zhang +2 位作者 Nu Lu Chuan-Jin Yao Guang-Lun Lei 《Petroleum Science》 SCIE CAS CSCD 2016年第3期496-506,共11页
Hall plot analysis,as a widespread injection evaluation method,however,often fails to achieve the desired result because of the inconspicuous change of the curve shape.Based on the cumulative injection volume,injectio... Hall plot analysis,as a widespread injection evaluation method,however,often fails to achieve the desired result because of the inconspicuous change of the curve shape.Based on the cumulative injection volume,injection rate,and the injection pressure,this paper establishes a new method using the ratio of the pressure to the injection rate(RPI) and the rate of change of the RPI to evaluate the injection efficiency of chemical flooding.The relationship between the RPI and the apparent resistance factor(apparent residual resistance factor) is obtained,similarly to the relationship between the rate of change of the RPI and the resistance factor.In order to estimate a thief zone in a reservoir,the influence of chemical crossflow on the rate of change of the RPI is analyzed.The new method has been applied successfully in the western part of the Gudong 7th reservoir.Compared with the Hall plot analysis,it is more accurate in real-time injection data interpretation and crossflow estimation.Specially,the rate of change of the RPI could be particularly suitably applied for new wells or converted wells lacking early water flooding history. 展开更多
关键词 Ratio of the pressure to the injection rate Rate of change of the RPI Injection efficiency Chemical crossflow
下载PDF
APPROXIMATE CONTROLLABILITY OF THE STOKES EQUATIONS WITH BOUNDARY CONDITION ON THE PRESSURE
5
作者 Kim Turin Chang Qianshun Xu Jing 《Journal of Partial Differential Equations》 2008年第2期97-111,共15页
In this paper, some properties of three-dimensional Stokes equations with boundary condition of pressure on parts of boundary are studied. By use of these properties, approximate controllability by tangent boundary co... In this paper, some properties of three-dimensional Stokes equations with boundary condition of pressure on parts of boundary are studied. By use of these properties, approximate controllability by tangent boundary controls acting on a subboundary is studied. In addition, the controllability problem is considered when its controls act on a subdomain. 展开更多
关键词 Stokes equation CONTROLLABILITY boundary condition on the pressure.
原文传递
Feeling the Pressure?
6
作者 Sanjay Gupta 尚文 《当代外语研究》 2005年第3期10-14,共2页
高血压是一种常见疾病,近年来该病患者数量呈上升趋势。本文分析 了美国高血压患者增加的原因、如何判断高血压,以及如何采取措施有效降低 血压。相信阅读本文会让关注此病的人减轻心头的压力。
关键词 Feeling the pressure
原文传递
Regularity of Solutions to the Navier-Stokes Equations with a Nonstandard Boundary Condition
7
作者 Tujin KIM 《Acta Mathematicae Applicatae Sinica》 SCIE CSCD 2015年第3期707-718,共12页
In this paper we are concerned with the regularity of solutions to the Navier-Stokes equations with the condition on the pressure on parts of the boundary where there is flow. For the steady Stokes problem a result si... In this paper we are concerned with the regularity of solutions to the Navier-Stokes equations with the condition on the pressure on parts of the boundary where there is flow. For the steady Stokes problem a result similar to L q-theory for the one with Dirichlet boundary condition is obtained. Using the result, for the steady Navier-Stokes equations we obtain regularity as the case of Dirichlet boundary conditions. Furthermore,for the time-dependent 2-D Navier-Stokes equations we prove uniqueness and existence of regular solutions,which is similar to J.M.Bernard's results[6]for the time-dependent 2-D Stokes equations. 展开更多
关键词 Navier-Stokes equation regularity boundary condition on the pressure
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部