The computer aided engineering is aiming at the numerical simulation-the important link in the advanced digital manufacturing.Its second development based on Ansys platform can be carried out often.In common,the Visua...The computer aided engineering is aiming at the numerical simulation-the important link in the advanced digital manufacturing.Its second development based on Ansys platform can be carried out often.In common,the Visual Basic and APDL are important development tools and are applied in the product design at the same time.In the paper,the secondary development flow and method based on Ansys is described.The parameter design and analysis process of the bridge girder erecting equipment is carried on with Ansys software and its secondary development tools—APDL and Visual Basics,including the interact between the mode of Ansys batch solving and Visual Basic.The method speeds up design and enhances the product the quality and the perfor- mance.展开更多
Organized by The Chinese Society of Rare Earths (CSRE) Co-Organized by Peking University (PKU),Roskill Information Services Ltd.,Metallurgical Council of CCPIT,Metal Pages,Baotou
Beijing / China August 2-6, 2010 Organized by The Chinese Society of Rare Earths (CSRE) Co-Organized by Peking University (PKU), Roskill Information Services Ltd., Metallurgical Council
Background Congenital heart diseases（CHDs） account for the majority of life-threatening congenital anomalies at birth. CHDs are outcomes of developmental disorders of heart during embryogenesis. Here, we reviewed th...Background Congenital heart diseases（CHDs） account for the majority of life-threatening congenital anomalies at birth. CHDs are outcomes of developmental disorders of heart during embryogenesis. Here, we reviewed the development of cardiac progenitors, called the second heart field（SHF）. And it is also the major origin of the outflow tract（OFT）, right ventricle and most of the atria.展开更多
The fracture volume is gradually changed with the depletion of fracture pressure during the production process.However,there are few flowback models available so far that can estimate the fracture volume loss using pr...The fracture volume is gradually changed with the depletion of fracture pressure during the production process.However,there are few flowback models available so far that can estimate the fracture volume loss using pressure transient and rate transient data.The initial flowback involves producing back the fracturing fuid after hydraulic fracturing,while the second flowback involves producing back the preloading fluid injected into the parent wells before fracturing of child wells.The main objective of this research is to compare the initial and second flowback data to capture the changes in fracture volume after production and preload processes.Such a comparison is useful for evaluating well performance and optimizing frac-turing operations.We construct rate-normalized pressure(RNP)versus material balance time(MBT)diagnostic plots using both initial and second flowback data(FB;and FBs,respectively)of six multi-fractured horizontal wells completed in Niobrara and Codell formations in DJ Basin.In general,the slope of RNP plot during the FB,period is higher than that during the FB;period,indicating a potential loss of fracture volume from the FB;to the FB,period.We estimate the changes in effective fracture volume(Ver)by analyzing the changes in the RNP slope and total compressibility between these two flowback periods.Ver during FB,is in general 3%-45%lower than that during FB:.We also compare the drive mechanisms for the two flowback periods by calculating the compaction-drive index(CDI),hydrocarbon-drive index(HDI),and water-drive index(WDI).The dominant drive mechanism during both flowback periods is CDI,but its contribution is reduced by 16%in the FB,period.This drop is generally compensated by a relatively higher HDI during this period.The loss of effective fracture volume might be attributed to the pressure depletion in fractures,which occurs during the production period and can extend 800 days.展开更多
This study aims to report a learner＇s language exposure and language use, early experience in mainstream classroom, difficulties at different stages of learning, and attitudes towards bilingualism in an English speak...This study aims to report a learner＇s language exposure and language use, early experience in mainstream classroom, difficulties at different stages of learning, and attitudes towards bilingualism in an English speaking country. It is concluded that when a student studies a second language, he/she should develop both interpersonal communicative skills and cognitive/academic language proficiency.展开更多
March 28 of this year is the second Tibetan Serfs Emancipation Day. People of all nationalities in Tibet marked the day by hoisting the national flag and by singing and dancing. Smiles were on every face and a festive...March 28 of this year is the second Tibetan Serfs Emancipation Day. People of all nationalities in Tibet marked the day by hoisting the national flag and by singing and dancing. Smiles were on every face and a festive atmosphere pervaded the snowcovered plateau region.展开更多
文摘The computer aided engineering is aiming at the numerical simulation-the important link in the advanced digital manufacturing.Its second development based on Ansys platform can be carried out often.In common,the Visual Basic and APDL are important development tools and are applied in the product design at the same time.In the paper,the secondary development flow and method based on Ansys is described.The parameter design and analysis process of the bridge girder erecting equipment is carried on with Ansys software and its secondary development tools—APDL and Visual Basics,including the interact between the mode of Ansys batch solving and Visual Basic.The method speeds up design and enhances the product the quality and the perfor- mance.
文摘Organized by The Chinese Society of Rare Earths (CSRE) Co-Organized by Peking University (PKU),Roskill Information Services Ltd.,Metallurgical Council of CCPIT,Metal Pages,Baotou
文摘Beijing / China August 2-6, 2010 Organized by The Chinese Society of Rare Earths (CSRE) Co-Organized by Peking University (PKU), Roskill Information Services Ltd., Metallurgical Council
基金supported by the National Cooperation Project of Chinese Ministry of Science and Technology(No.2008DFA31140/2010DFA32660)State Science and Technology Projects(No.2011BAI11B22)National Natural Science Foundation of China(No.81370230)
文摘Background Congenital heart diseases（CHDs） account for the majority of life-threatening congenital anomalies at birth. CHDs are outcomes of developmental disorders of heart during embryogenesis. Here, we reviewed the development of cardiac progenitors, called the second heart field（SHF）. And it is also the major origin of the outflow tract（OFT）, right ventricle and most of the atria.
文摘The fracture volume is gradually changed with the depletion of fracture pressure during the production process.However,there are few flowback models available so far that can estimate the fracture volume loss using pressure transient and rate transient data.The initial flowback involves producing back the fracturing fuid after hydraulic fracturing,while the second flowback involves producing back the preloading fluid injected into the parent wells before fracturing of child wells.The main objective of this research is to compare the initial and second flowback data to capture the changes in fracture volume after production and preload processes.Such a comparison is useful for evaluating well performance and optimizing frac-turing operations.We construct rate-normalized pressure(RNP)versus material balance time(MBT)diagnostic plots using both initial and second flowback data(FB;and FBs,respectively)of six multi-fractured horizontal wells completed in Niobrara and Codell formations in DJ Basin.In general,the slope of RNP plot during the FB,period is higher than that during the FB;period,indicating a potential loss of fracture volume from the FB;to the FB,period.We estimate the changes in effective fracture volume(Ver)by analyzing the changes in the RNP slope and total compressibility between these two flowback periods.Ver during FB,is in general 3%-45%lower than that during FB:.We also compare the drive mechanisms for the two flowback periods by calculating the compaction-drive index(CDI),hydrocarbon-drive index(HDI),and water-drive index(WDI).The dominant drive mechanism during both flowback periods is CDI,but its contribution is reduced by 16%in the FB,period.This drop is generally compensated by a relatively higher HDI during this period.The loss of effective fracture volume might be attributed to the pressure depletion in fractures,which occurs during the production period and can extend 800 days.
文摘This study aims to report a learner＇s language exposure and language use, early experience in mainstream classroom, difficulties at different stages of learning, and attitudes towards bilingualism in an English speaking country. It is concluded that when a student studies a second language, he/she should develop both interpersonal communicative skills and cognitive/academic language proficiency.
文摘March 28 of this year is the second Tibetan Serfs Emancipation Day. People of all nationalities in Tibet marked the day by hoisting the national flag and by singing and dancing. Smiles were on every face and a festive atmosphere pervaded the snowcovered plateau region.
