During the exploitation of offshore oil and gas,it is easy to form severe slugging which can cause great harm in the riser connecting wellheads and offshore platform preprocessing system.The flow pattern and pressure ...During the exploitation of offshore oil and gas,it is easy to form severe slugging which can cause great harm in the riser connecting wellheads and offshore platform preprocessing system.The flow pattern and pressure fluctuation of severe slugging were studied in an experimental simulation system with inner diameter of 0.051 m.It is found that severe slugging can be divided into three severe slugging regimes：regime I at low gas and liquid flow rates with large pressure fluctuation,intermittent flow of liquid and gas in the riser,and apparent cutoff of liquid phase,regime II at high gas flow rate with non-periodic fluctuation and discontinuous liquid outflow and no gas cutoff,regime III at high liquid flow rate with degenerative pressure fluctuation in form of relatively stable bubbly or plug flow.The results indicate that severe slugging still occurs when the declination angle of pipeline is 0,and there are mainly two kinds of regimes：regime I and regime II.As the angle increases,the formation ranges of regime I and regime III increase slightly while that of regime II is not affected.With the increase of gas superficial velocity and liquid superficial velocity,the pressure fluctuation at the bottom of riser increases initially and then decreases.The maximum value of pressure fluctuation occurs at the transition boundary of regimes I and II.展开更多
AIM： To determine if the observed paracellular sucrose leak in Barrett＇s esophagus patients is due to their pro- ton pump inhibitor （PPI） use. METHODS： The in vivo sucrose permeability test was administered to he...AIM： To determine if the observed paracellular sucrose leak in Barrett＇s esophagus patients is due to their pro- ton pump inhibitor （PPI） use. METHODS： The in vivo sucrose permeability test was administered to healthy controls, to Barrett＇s patients and to non-Barrett＇s patients on continuous PPI thera- py. Degree of leak was tested for correlation with pres- ence of Barrett＇s, use of PPIs, and length of Barrett＇s segment and duration of PPI use. RESULTS： Barrett＇s patients manifested a near 3-fold greater, upper gastrointestinal sucrose leak than healthy controls. A decrease of sucrose leak was ob- served in Barrett＇s patients who ceased PPI use for 7 d.Although initial introduction of PPI use （in a PPI-na＇ive population） results in dramatic increase in sucrose leak, long-term, continuous PPI use manifested a slow spon- taneous decline in leak. The sucrose leak observed in Barrett＇s patients showed no correlation to the amount of Barrett＇s tissue present in the esophagus. CONCLUSION： Although future research is needed to determine the degree of paracellular leak in actual Barrett＇s mucosa, the relatively high degree of leak ob- served with in vivo sucrose permeability measurement of Barrett＇s patients reflects their PPI use and not their Barrett＇s tissue perse.展开更多
To explore the management orientation of employees in Malaysia and the United States, this paper focuses on comparing the leadership and stress perception of respondents in these two different countries. It appears th...To explore the management orientation of employees in Malaysia and the United States, this paper focuses on comparing the leadership and stress perception of respondents in these two different countries. It appears that Malaysians and Americans have a significantly higher score on the relationship-orientation than task-orientation. Similarly, the female respondents in Malaysia had a significantly higher score on the relationship orientation. Finally, the responses of these 216 Malaysian respondents were compared with the 87 Americans, demonstrating significantly higher scores for respondents from the U.S. on both orientations. For management and practical application, suggestions and implications for future studies are presented.展开更多
The international US executive in foreign assignments faces more obstacles than his counterpart for domestic assignments. He has to pursue better coping skills for： cultural, communication and language, self-capabili...The international US executive in foreign assignments faces more obstacles than his counterpart for domestic assignments. He has to pursue better coping skills for： cultural, communication and language, self-capability, stress management, and adjustment issues in the foreign settings. Premature return can be obviated through improved pre-departure training and post-arrival mentoring. US expatriates who are selected for foreign assignments in culturally distant and operationally different countries have an especially important need for their development and training. The challenge to adapt and become functional and fluent in the local surroundings in a very short time is very difficult for the expatriate. The expatriate＇s strange and difficult-to-fathom foreign environment causes him to be anxious as he works hard to adjust and be effective. The obstacles of dealing with the different business customs, social etiquette, and language differences make it difficult for communication, operating environments, and building professional relationships in an appropriate manner. He has to deal with the strangeness and unfamiliarity during the initial period after his arrival in the foreign country. This is further compounded by the pressing need for him to show good performance and produce results in his foreign assignment. He struggles to adjust and to perform the technical aspects of his task.展开更多
In order to prevent coal and methane outbursts, mining protective layers is an effective means, yet no precedents of mining multiple protective layers is discoveried in seams which includes several seams are prone to ...In order to prevent coal and methane outbursts, mining protective layers is an effective means, yet no precedents of mining multiple protective layers is discoveried in seams which includes several seams are prone to outburst like Xinzhuangzi Mine. This paper perfected the related theories through analyzing mining multiple upper protective layers. By means of examining several parameters, it synthetically analyzed and ascer- tains the protected effectiveness and scope and reasonable parameters, finally obtained the specific indexes and effectiveness of mining multiple protective layers in coal seams cluster.展开更多
To clarify and control the collapse and weighting of main roof in longwall mining is one of the important research problems in ground control. Based on the results of physical model experiment and field measurement, t...To clarify and control the collapse and weighting of main roof in longwall mining is one of the important research problems in ground control. Based on the results of physical model experiment and field measurement, the behaviour of main roof above trapezoidal goaf or with fault is studied in this paper. The fracture and weighting of main roof above trapezoidal goaf are different from those above rectangular goaf. It depends on the mechanical relation between main roof blocks whether the plate blocks of main roof on both sides of fault simultaneously break and collapse.展开更多
With the advent of the knowledge economy era, the modem enterprise desires to maintain sustainable development, the key is to find the best ways of knowledge creation, dissemination and use through the management. Kno...With the advent of the knowledge economy era, the modem enterprise desires to maintain sustainable development, the key is to find the best ways of knowledge creation, dissemination and use through the management. Knowledge workers are the main force of economic construction. They play a more important role in the development of enterprises and society, while facing greater pressure. This paper describes the status of work stress management study in China and abroad. Then analyze the source of the knowledge workers working pressure and Working pressure mechanism on job performance. Eventually, the paper proposes active management strategies of enterprise knowledge workers working stress.展开更多
The rockburst of the poal pillar under a thick hard roof stratum is modelled as the instability failure problem of coal pillars under strata subject to elastic support. The instability mechanism of rockburst is studie...The rockburst of the poal pillar under a thick hard roof stratum is modelled as the instability failure problem of coal pillars under strata subject to elastic support. The instability mechanism of rockburst is studied by applying cusp catastrophic theory. The effects of the stiffness ratio of the system and loads imposed on the system on the rockburst are explicated.The factors affecting rockbursts are discussed. Based on them, the evolution process, the forewarning regularity arid forewarning sings of rockbursts are studied. It is indicated that the subsidence velocity of roof stratum, which increases quickly and tends to infinity, is the forewarning measurable signs of the rockbursts of coal pillar.展开更多
In recent years, staff turnover has become a common problem for each company. In this paper, taking Shanghai Red Express Co. for example, on the basis of famous Western scholars Price-Mueller （2000） model, anaiyzing...In recent years, staff turnover has become a common problem for each company. In this paper, taking Shanghai Red Express Co. for example, on the basis of famous Western scholars Price-Mueller （2000） model, anaiyzing the impact ofemployee turnover variable, such as salary and welfare is lower than expected, work pressure, lack of promotion opportunities, the company management confusion, etc, and then proposed targeted measures to reduce the rate of turnover and retain talent for the company, such as establishing scientific and reasonable salary system, improve the working environment, to establish a reasonable training system and career development path.展开更多
In power systems, a large number of OPLs （overhead power lines） are more than 40 years old and some even exceed 50 years old. The key issue for power systems managers, public utilities companies and electrical engin...In power systems, a large number of OPLs （overhead power lines） are more than 40 years old and some even exceed 50 years old. The key issue for power systems managers, public utilities companies and electrical engineers today concerns the manner in which available financial resources should be invested in these OPLs to provide the greatest impact on the power system as a whole and to address the OPLs that require urgent revitalization. This paper presents the application of the software tool RevOPL, developed using Microsoft Access utilizing the ＂methodology for revitalization of high-voltage OPLs＂. The aim is to present both the methodology and software to objectively evaluate the condition of an OPL and determine its remaining service life. The application of this software tool provides a proposal for the scheduling and scope of planned revitalization activities, which are obtained through the optimization of the technical characteristics while remaining within the available budget.展开更多
In the 21st century, human resources will be the key to win in the war of business. Therefore, to manage and develop the effective and reasonable human resources, and maximize the potential of corporate human resource...In the 21st century, human resources will be the key to win in the war of business. Therefore, to manage and develop the effective and reasonable human resources, and maximize the potential of corporate human resources is very important to the achievement of corporate goals. This article is in-depth analysis about FOXCONN＇ human resource management problems of management philosophy, work pressure, cross-cultural conflicts, labor relations. IfFOXCONN want to achieve sustainable development, it must change the current purely export-oriented foundry mode, and promote people-oriented. It also should take cultural integrate and manage personnel measures to effectively manage cultural, and take effective measures to improve labor relations.展开更多
The former gas pipeline operating pressure transmission determined mostly according to the determined formula into the corresponding pipeline parameters are obtained, and the parameters of the actual pipeline due to m...The former gas pipeline operating pressure transmission determined mostly according to the determined formula into the corresponding pipeline parameters are obtained, and the parameters of the actual pipeline due to many reasons, such as measurement error, production batch, etc., is not a fixed value. This paper on pipeline integrity established limit state equation, using Monte Carlo method to calculate the gas pipeline in different pressures of reliability, according to the API （American Petroleum Institute） 579 recommended target reliability to determine the operating pressure of the different regions, and design coefficient method, the calculated results are compared, results of calculation reliability is more reasonable and improve the delivery pressure of the area, the pipeline safety management provides the basis.展开更多
基金Supported by the National High Technology Research and Development Program of China(2006AA09Z302)
文摘During the exploitation of offshore oil and gas,it is easy to form severe slugging which can cause great harm in the riser connecting wellheads and offshore platform preprocessing system.The flow pattern and pressure fluctuation of severe slugging were studied in an experimental simulation system with inner diameter of 0.051 m.It is found that severe slugging can be divided into three severe slugging regimes：regime I at low gas and liquid flow rates with large pressure fluctuation,intermittent flow of liquid and gas in the riser,and apparent cutoff of liquid phase,regime II at high gas flow rate with non-periodic fluctuation and discontinuous liquid outflow and no gas cutoff,regime III at high liquid flow rate with degenerative pressure fluctuation in form of relatively stable bubbly or plug flow.The results indicate that severe slugging still occurs when the declination angle of pipeline is 0,and there are mainly two kinds of regimes：regime I and regime II.As the angle increases,the formation ranges of regime I and regime III increase slightly while that of regime II is not affected.With the increase of gas superficial velocity and liquid superficial velocity,the pressure fluctuation at the bottom of riser increases initially and then decreases.The maximum value of pressure fluctuation occurs at the transition boundary of regimes I and II.
基金Supported by Sharpe-Strumia Research Foundation of the Bryn Mawr Hospital
文摘AIM： To determine if the observed paracellular sucrose leak in Barrett＇s esophagus patients is due to their pro- ton pump inhibitor （PPI） use. METHODS： The in vivo sucrose permeability test was administered to healthy controls, to Barrett＇s patients and to non-Barrett＇s patients on continuous PPI thera- py. Degree of leak was tested for correlation with pres- ence of Barrett＇s, use of PPIs, and length of Barrett＇s segment and duration of PPI use. RESULTS： Barrett＇s patients manifested a near 3-fold greater, upper gastrointestinal sucrose leak than healthy controls. A decrease of sucrose leak was ob- served in Barrett＇s patients who ceased PPI use for 7 d.Although initial introduction of PPI use （in a PPI-na＇ive population） results in dramatic increase in sucrose leak, long-term, continuous PPI use manifested a slow spon- taneous decline in leak. The sucrose leak observed in Barrett＇s patients showed no correlation to the amount of Barrett＇s tissue present in the esophagus. CONCLUSION： Although future research is needed to determine the degree of paracellular leak in actual Barrett＇s mucosa, the relatively high degree of leak ob- served with in vivo sucrose permeability measurement of Barrett＇s patients reflects their PPI use and not their Barrett＇s tissue perse.
文摘To explore the management orientation of employees in Malaysia and the United States, this paper focuses on comparing the leadership and stress perception of respondents in these two different countries. It appears that Malaysians and Americans have a significantly higher score on the relationship-orientation than task-orientation. Similarly, the female respondents in Malaysia had a significantly higher score on the relationship orientation. Finally, the responses of these 216 Malaysian respondents were compared with the 87 Americans, demonstrating significantly higher scores for respondents from the U.S. on both orientations. For management and practical application, suggestions and implications for future studies are presented.
文摘The international US executive in foreign assignments faces more obstacles than his counterpart for domestic assignments. He has to pursue better coping skills for： cultural, communication and language, self-capability, stress management, and adjustment issues in the foreign settings. Premature return can be obviated through improved pre-departure training and post-arrival mentoring. US expatriates who are selected for foreign assignments in culturally distant and operationally different countries have an especially important need for their development and training. The challenge to adapt and become functional and fluent in the local surroundings in a very short time is very difficult for the expatriate. The expatriate＇s strange and difficult-to-fathom foreign environment causes him to be anxious as he works hard to adjust and be effective. The obstacles of dealing with the different business customs, social etiquette, and language differences make it difficult for communication, operating environments, and building professional relationships in an appropriate manner. He has to deal with the strangeness and unfamiliarity during the initial period after his arrival in the foreign country. This is further compounded by the pressing need for him to show good performance and produce results in his foreign assignment. He struggles to adjust and to perform the technical aspects of his task.
文摘In order to prevent coal and methane outbursts, mining protective layers is an effective means, yet no precedents of mining multiple protective layers is discoveried in seams which includes several seams are prone to outburst like Xinzhuangzi Mine. This paper perfected the related theories through analyzing mining multiple upper protective layers. By means of examining several parameters, it synthetically analyzed and ascer- tains the protected effectiveness and scope and reasonable parameters, finally obtained the specific indexes and effectiveness of mining multiple protective layers in coal seams cluster.
文摘To clarify and control the collapse and weighting of main roof in longwall mining is one of the important research problems in ground control. Based on the results of physical model experiment and field measurement, the behaviour of main roof above trapezoidal goaf or with fault is studied in this paper. The fracture and weighting of main roof above trapezoidal goaf are different from those above rectangular goaf. It depends on the mechanical relation between main roof blocks whether the plate blocks of main roof on both sides of fault simultaneously break and collapse.
文摘With the advent of the knowledge economy era, the modem enterprise desires to maintain sustainable development, the key is to find the best ways of knowledge creation, dissemination and use through the management. Knowledge workers are the main force of economic construction. They play a more important role in the development of enterprises and society, while facing greater pressure. This paper describes the status of work stress management study in China and abroad. Then analyze the source of the knowledge workers working pressure and Working pressure mechanism on job performance. Eventually, the paper proposes active management strategies of enterprise knowledge workers working stress.
文摘The rockburst of the poal pillar under a thick hard roof stratum is modelled as the instability failure problem of coal pillars under strata subject to elastic support. The instability mechanism of rockburst is studied by applying cusp catastrophic theory. The effects of the stiffness ratio of the system and loads imposed on the system on the rockburst are explicated.The factors affecting rockbursts are discussed. Based on them, the evolution process, the forewarning regularity arid forewarning sings of rockbursts are studied. It is indicated that the subsidence velocity of roof stratum, which increases quickly and tends to infinity, is the forewarning measurable signs of the rockbursts of coal pillar.
文摘In recent years, staff turnover has become a common problem for each company. In this paper, taking Shanghai Red Express Co. for example, on the basis of famous Western scholars Price-Mueller （2000） model, anaiyzing the impact ofemployee turnover variable, such as salary and welfare is lower than expected, work pressure, lack of promotion opportunities, the company management confusion, etc, and then proposed targeted measures to reduce the rate of turnover and retain talent for the company, such as establishing scientific and reasonable salary system, improve the working environment, to establish a reasonable training system and career development path.
文摘In power systems, a large number of OPLs （overhead power lines） are more than 40 years old and some even exceed 50 years old. The key issue for power systems managers, public utilities companies and electrical engineers today concerns the manner in which available financial resources should be invested in these OPLs to provide the greatest impact on the power system as a whole and to address the OPLs that require urgent revitalization. This paper presents the application of the software tool RevOPL, developed using Microsoft Access utilizing the ＂methodology for revitalization of high-voltage OPLs＂. The aim is to present both the methodology and software to objectively evaluate the condition of an OPL and determine its remaining service life. The application of this software tool provides a proposal for the scheduling and scope of planned revitalization activities, which are obtained through the optimization of the technical characteristics while remaining within the available budget.
文摘In the 21st century, human resources will be the key to win in the war of business. Therefore, to manage and develop the effective and reasonable human resources, and maximize the potential of corporate human resources is very important to the achievement of corporate goals. This article is in-depth analysis about FOXCONN＇ human resource management problems of management philosophy, work pressure, cross-cultural conflicts, labor relations. IfFOXCONN want to achieve sustainable development, it must change the current purely export-oriented foundry mode, and promote people-oriented. It also should take cultural integrate and manage personnel measures to effectively manage cultural, and take effective measures to improve labor relations.
文摘The former gas pipeline operating pressure transmission determined mostly according to the determined formula into the corresponding pipeline parameters are obtained, and the parameters of the actual pipeline due to many reasons, such as measurement error, production batch, etc., is not a fixed value. This paper on pipeline integrity established limit state equation, using Monte Carlo method to calculate the gas pipeline in different pressures of reliability, according to the API （American Petroleum Institute） 579 recommended target reliability to determine the operating pressure of the different regions, and design coefficient method, the calculated results are compared, results of calculation reliability is more reasonable and improve the delivery pressure of the area, the pipeline safety management provides the basis.
