The Bozhong oilfield (Hereinafter referred to as BZ oilfield) is a typical representative of complex fluvial reservoirs in the Bohai Sea, located in the southern Bohai Sea, with an average porosity of 30.3% and an ave...The Bozhong oilfield (Hereinafter referred to as BZ oilfield) is a typical representative of complex fluvial reservoirs in the Bohai Sea, located in the southern Bohai Sea, with an average porosity of 30.3% and an average permeability of 643 × 10<sup>-3</sup> μm<sup>2</sup>, belonging to medium high porosity and permeability reservoir, the reservoir has good connectivity, and the average underground crude oil viscosity is 5 mPa·s. There are many plane fault blocks, and the longitudinal oil well section is long, so the oil-water relationship is very complex. With the further development of the oilfield, the vertical and horizontal oil-water movement law, residual oil distribution and potential are unclear, resulting in rapid bottom water coning, unbalanced injection and production in the oilfield, and increasingly prominent contradictions among layers, planes and layers in the oilfield. Through numerical simulation analysis and comparison of displacement law and recovery degree under different influence conditions, this paper studies the development effect of actual sand body under different influence conditions such as different well types, different development methods and well layout positions, and takes appropriate development methods for the oilfield, which is of great significance to improve the development effect of the oilfield.展开更多
Globally, business administration is a young and active discipline with rapid development in the higher education system. It originated in Europe, flourished in the United States and spread around the world. The histo...Globally, business administration is a young and active discipline with rapid development in the higher education system. It originated in Europe, flourished in the United States and spread around the world. The history of business administration is measured by the three basic functions of higher education and service, scientific research and social service for more than 70 years. As a whole, its scientific nature (the attribute of studying general principles) is lower than that of most social sciences, but higher than that of most humanistic fields. Under different social and cultural backgrounds, the development in the field of business administration indicates the coexistence of interrelation and diversity. Therefore, it is not easy to summarize the development law in the field of business administration.展开更多
Investigations into rail corrugation within metro systems have traditionally focused on specific mechanisms,thereby limiting the generalizability of proposed theories.Understanding the commonalities in rail corrugatio...Investigations into rail corrugation within metro systems have traditionally focused on specific mechanisms,thereby limiting the generalizability of proposed theories.Understanding the commonalities in rail corrugation across diverse metro lines remains pivotal for elucidating its underlying mechanisms.The present study conducted extensive field surveys and tracking tests across 14 Chinese metro lines.By employing t-distributed stochastic neighbor embedding(t-SNE)for dimensional reduction and employing the unsupervised clustering algorithm DBSCAN,the research redefines the classification of metro rail corrugation based on characteristic information.The analysis encompassed spatial distribution and temporal evolution of this phenomenon.Findings revealed that floating slab tracks exhibited the highest proportion of rail corrugation at 47%.Notably,ordinary monolithic bed tracks employing damping fasteners were more prone to inducing rail corrugation.Corrugation primarily manifested in curve sections with radii between 300 and 500 m,featuring ordinary monolithic bed track and steel-spring floating slab track structures,with wavelengths typically between 30 and 120 mm.Stick–slip vibrations of the wheel–rail system maybe led to short-wavelength corrugations(40–60 mm),while longer wavelengths(200–300 mm)exhibited distinct fatigue damage characteristics,mainly observed in steel-spring floating slab tracks and small-radius curve sections of ordinary monolithic bed tracks and ladder sleeper tracks.A classification system comprising 57 correlated features categorized metro rail corrugation into four distinct types.These research outcomes serve as critical benchmarks for validating various theories pertaining to rail corrugation formation.展开更多
Adolescents’physical and mental development has obvious age-stage characteristics.Therefore,before the implementation of physical education teaching,it is necessary to fully analyze the laws of adolescents’psycholog...Adolescents’physical and mental development has obvious age-stage characteristics.Therefore,before the implementation of physical education teaching,it is necessary to fully analyze the laws of adolescents’psychological development and fully understand the laws of adolescents’physical development and exercise acquisition.The purpose of this study is to start from the actual needs of physical education teaching and to fully understand the laws of psychological development of adolescent groups.After the review and analysis,the law of adolescents’sports acquisition is summarized and summarized,so as to form the system of adolescents’psychological development and sports acquisition law in physical education teaching,lay a good foundation for physical education teachers to implement teaching on the teaching objects of adolescent students in a targeted and efficient manner,and ultimately promote the benign development of school sports.展开更多
Discussions on grasping the laws and trends of historical development take a fundamental theoretical position in the scientific system of Xi Jinping Thought on Socialism with Chinese Characteristics for a New Era.Xi J...Discussions on grasping the laws and trends of historical development take a fundamental theoretical position in the scientific system of Xi Jinping Thought on Socialism with Chinese Characteristics for a New Era.Xi Jinping’s important statements have systematically answered such questions as what type of laws and trends of historical development should be followed,how did the Party follow the laws and trends of historical development in its centennial history,and how should the laws and trends of historical development be followed in a new era.The birth of the Communist Party of China(CPC),the victory of China’s War of Resistance against Japanese Aggression,the founding of the People’s Republic of China,and the unveiling of a new era for reform and opening up and socialism with Chinese characteristics are all the results of grasping the laws and trends of historical development.Over the past century,the Party has followed the laws and trends of historical development and continuously advanced the sinicization of Marxism on the basis of adhering to the unification between truth and values.In pursuit of“putting people first,”the Party has courageously been reforming itself and made relentless progress in the great endeavor of Party building.History shows that a keen appreciation of the laws and trends of historical development is an important sign of political maturity for a proletarian party.Only by applying Marxism according to current times and conditions will we keep abreast with the laws and trends of historical development.We should establish a broader concept of history and identify the laws and trends of historical development from the interactions and linkages between China and the rest of the world.We must recognize and promote the outstanding role of great leaders in steering the country in line with the laws and trends of historical development.展开更多
[Objective] To explore the law of intestinal development of Wanxi white geese at 0 -9 weeks old. [Method] A total of 120 Wanxi white geese at 1 day old were selected, and their law of development of intestinal weight ...[Objective] To explore the law of intestinal development of Wanxi white geese at 0 -9 weeks old. [Method] A total of 120 Wanxi white geese at 1 day old were selected, and their law of development of intestinal weight and length was studied by feeding test and slaughter test. [ Re- sult] The growth of Wanxi white geese was slow in the early age, rapid at the age of 2 -5 wk, peaked at about 5 weeks old, and then slowed. The daily weight gain was around 25 g/d at the age of 7 -9 wk. Intestinal growth also peaked at 5 weeks old and almost developed fully at 7 weeks old. Thus, intestinal growth had a similar law with body weight. With the development, the ratios of the length of each intestinal segment to that of total intestinal tract did not vary largely. [ Conclusion] The study provides a theoretical basis for the production and development of germplasm resources of Wanxi white geese.展开更多
Science, technology and engineering expertise form a treasurehouse of knowledge acquired by man in striving to understand and change nature.They respond respectively to different links of this endless endeavour.So the...Science, technology and engineering expertise form a treasurehouse of knowledge acquired by man in striving to understand and change nature.They respond respectively to different links of this endless endeavour.So they differ greatly from each other but are closely associated.Science refers to various principles, basic theories and concepts summed up from man’s cognition of natural phenomena,exploration of material movements and related objective laws; technology is the applicable methods and practical means developed from scien-展开更多
The Fourth Plenary Session of the 18th Central Committee of the Communist Party of China （CPC） reviewed and approved the Decision of the CPC Central Committee on Certain Key Issues Concerning Comprehensively Pushing...The Fourth Plenary Session of the 18th Central Committee of the Communist Party of China （CPC） reviewed and approved the Decision of the CPC Central Committee on Certain Key Issues Concerning Comprehensively Pushing Forward the Rule of Law （hereafter, ＂Decision＂）. The plenary session was convened at a pivotal stage in comprehensively building a well-off society and comprehen- sively deepening reform. It was the first of its kind with the theme of the rule of law and was a landmark event in China＇s legal construction. The Journal interviewed Professor Luo Haocai, who is also president of the China Society for Human Rights Studies （CSHRS）.展开更多
[Objective] This study was to explore the skin development law of Datong Yak.[Method]Taking Datong yaks at four various growth stages（1 day old,30 days old,180 days old and adult）as experimental materials,we studied...[Objective] This study was to explore the skin development law of Datong Yak.[Method]Taking Datong yaks at four various growth stages（1 day old,30 days old,180 days old and adult）as experimental materials,we studied histological structure of Datong yak skin by employing the histological methods.[Results]The skins of Datong yak at four various growth stages all showed the characteristics of thinner epidermis and thicker hypodermis,and of less capillary vessels in hypodermis and more pigment cells in epidermis.Datong yak at four various growth stages all showed a fluctuating trend in entire skin thickness,in detail thickening from 1 day old to 30 days old,then thinning to 180 days old,again thickening to adult.[Conclusion]The results provided theoretical basis for further understanding the structural characteristics of Datong yak to adapt to the abominable plateau environment.展开更多
Ground surveying and mapping, field investigation and engineering drilling are adopted;A large-scale geological disaster survey was carried out along the Duku Highway (Dushanzi-Kuqa) by means of indoor tests of engine...Ground surveying and mapping, field investigation and engineering drilling are adopted;A large-scale geological disaster survey was carried out along the Duku Highway (Dushanzi-Kuqa) by means of indoor tests of engineering geophysical exploration and other methods. The types and development laws of geological disasters along the line are summarized. There are 520 geological disasters along the line. 377 of them collapsed;37 landslides;106 debris flows;The collapse failure mechanism is mainly of toppling type;Debris flows are mostly gully-type torrential rain-type dilute debris flows;Landslide is mainly of rock traction type. Disasters mainly occurred during the period of concentrated rainfall;Geological disasters have certain spatial distribution characteristics. Most geological disasters are debris flow and collapse;There are fewer landslides. The results of the investigation and research have guiding and referential significance for the prevention and control of geological disasters on Duku Highway.展开更多
It is very timely and necessary for us to hold this seminar in the beautiful Suzhou Campus of Renmin University of China to deeply study and implement the decisions of the Fourth Plenary Session of the 18th Communist ...It is very timely and necessary for us to hold this seminar in the beautiful Suzhou Campus of Renmin University of China to deeply study and implement the decisions of the Fourth Plenary Session of the 18th Communist Party of China(CPC)Central Committee,push forward the construction of China’s rule of law and jointly discuss the development of China’s human rights cause.展开更多
文摘The Bozhong oilfield (Hereinafter referred to as BZ oilfield) is a typical representative of complex fluvial reservoirs in the Bohai Sea, located in the southern Bohai Sea, with an average porosity of 30.3% and an average permeability of 643 × 10<sup>-3</sup> μm<sup>2</sup>, belonging to medium high porosity and permeability reservoir, the reservoir has good connectivity, and the average underground crude oil viscosity is 5 mPa·s. There are many plane fault blocks, and the longitudinal oil well section is long, so the oil-water relationship is very complex. With the further development of the oilfield, the vertical and horizontal oil-water movement law, residual oil distribution and potential are unclear, resulting in rapid bottom water coning, unbalanced injection and production in the oilfield, and increasingly prominent contradictions among layers, planes and layers in the oilfield. Through numerical simulation analysis and comparison of displacement law and recovery degree under different influence conditions, this paper studies the development effect of actual sand body under different influence conditions such as different well types, different development methods and well layout positions, and takes appropriate development methods for the oilfield, which is of great significance to improve the development effect of the oilfield.
文摘Globally, business administration is a young and active discipline with rapid development in the higher education system. It originated in Europe, flourished in the United States and spread around the world. The history of business administration is measured by the three basic functions of higher education and service, scientific research and social service for more than 70 years. As a whole, its scientific nature (the attribute of studying general principles) is lower than that of most social sciences, but higher than that of most humanistic fields. Under different social and cultural backgrounds, the development in the field of business administration indicates the coexistence of interrelation and diversity. Therefore, it is not easy to summarize the development law in the field of business administration.
基金support extended by the Joint Funds of Beijing Municipal Natural Science Foundation and Fengtai Rail Transit Frontier Research(Grant No.L211006)the Fundamental Research Funds for the Central Universities(Science and technology leading talent team project,Grant No.2022JBXT010)+1 种基金the Fundamental Research Funds for the Central Universities(Grant No.2023YJS052)the National Natural Science Foundation of China(Grant No.52308426)。
文摘Investigations into rail corrugation within metro systems have traditionally focused on specific mechanisms,thereby limiting the generalizability of proposed theories.Understanding the commonalities in rail corrugation across diverse metro lines remains pivotal for elucidating its underlying mechanisms.The present study conducted extensive field surveys and tracking tests across 14 Chinese metro lines.By employing t-distributed stochastic neighbor embedding(t-SNE)for dimensional reduction and employing the unsupervised clustering algorithm DBSCAN,the research redefines the classification of metro rail corrugation based on characteristic information.The analysis encompassed spatial distribution and temporal evolution of this phenomenon.Findings revealed that floating slab tracks exhibited the highest proportion of rail corrugation at 47%.Notably,ordinary monolithic bed tracks employing damping fasteners were more prone to inducing rail corrugation.Corrugation primarily manifested in curve sections with radii between 300 and 500 m,featuring ordinary monolithic bed track and steel-spring floating slab track structures,with wavelengths typically between 30 and 120 mm.Stick–slip vibrations of the wheel–rail system maybe led to short-wavelength corrugations(40–60 mm),while longer wavelengths(200–300 mm)exhibited distinct fatigue damage characteristics,mainly observed in steel-spring floating slab tracks and small-radius curve sections of ordinary monolithic bed tracks and ladder sleeper tracks.A classification system comprising 57 correlated features categorized metro rail corrugation into four distinct types.These research outcomes serve as critical benchmarks for validating various theories pertaining to rail corrugation formation.
文摘Adolescents’physical and mental development has obvious age-stage characteristics.Therefore,before the implementation of physical education teaching,it is necessary to fully analyze the laws of adolescents’psychological development and fully understand the laws of adolescents’physical development and exercise acquisition.The purpose of this study is to start from the actual needs of physical education teaching and to fully understand the laws of psychological development of adolescent groups.After the review and analysis,the law of adolescents’sports acquisition is summarized and summarized,so as to form the system of adolescents’psychological development and sports acquisition law in physical education teaching,lay a good foundation for physical education teachers to implement teaching on the teaching objects of adolescent students in a targeted and efficient manner,and ultimately promote the benign development of school sports.
文摘Discussions on grasping the laws and trends of historical development take a fundamental theoretical position in the scientific system of Xi Jinping Thought on Socialism with Chinese Characteristics for a New Era.Xi Jinping’s important statements have systematically answered such questions as what type of laws and trends of historical development should be followed,how did the Party follow the laws and trends of historical development in its centennial history,and how should the laws and trends of historical development be followed in a new era.The birth of the Communist Party of China(CPC),the victory of China’s War of Resistance against Japanese Aggression,the founding of the People’s Republic of China,and the unveiling of a new era for reform and opening up and socialism with Chinese characteristics are all the results of grasping the laws and trends of historical development.Over the past century,the Party has followed the laws and trends of historical development and continuously advanced the sinicization of Marxism on the basis of adhering to the unification between truth and values.In pursuit of“putting people first,”the Party has courageously been reforming itself and made relentless progress in the great endeavor of Party building.History shows that a keen appreciation of the laws and trends of historical development is an important sign of political maturity for a proletarian party.Only by applying Marxism according to current times and conditions will we keep abreast with the laws and trends of historical development.We should establish a broader concept of history and identify the laws and trends of historical development from the interactions and linkages between China and the rest of the world.We must recognize and promote the outstanding role of great leaders in steering the country in line with the laws and trends of historical development.
基金funded by the Natural Science Foundation of Education Department of Henan Province ( 2010B230013)Youth Research Fund of Zhoukou Normal University( zknuqn201030A)
文摘[Objective] To explore the law of intestinal development of Wanxi white geese at 0 -9 weeks old. [Method] A total of 120 Wanxi white geese at 1 day old were selected, and their law of development of intestinal weight and length was studied by feeding test and slaughter test. [ Re- sult] The growth of Wanxi white geese was slow in the early age, rapid at the age of 2 -5 wk, peaked at about 5 weeks old, and then slowed. The daily weight gain was around 25 g/d at the age of 7 -9 wk. Intestinal growth also peaked at 5 weeks old and almost developed fully at 7 weeks old. Thus, intestinal growth had a similar law with body weight. With the development, the ratios of the length of each intestinal segment to that of total intestinal tract did not vary largely. [ Conclusion] The study provides a theoretical basis for the production and development of germplasm resources of Wanxi white geese.
文摘Science, technology and engineering expertise form a treasurehouse of knowledge acquired by man in striving to understand and change nature.They respond respectively to different links of this endless endeavour.So they differ greatly from each other but are closely associated.Science refers to various principles, basic theories and concepts summed up from man’s cognition of natural phenomena,exploration of material movements and related objective laws; technology is the applicable methods and practical means developed from scien-
文摘The Fourth Plenary Session of the 18th Central Committee of the Communist Party of China （CPC） reviewed and approved the Decision of the CPC Central Committee on Certain Key Issues Concerning Comprehensively Pushing Forward the Rule of Law （hereafter, ＂Decision＂）. The plenary session was convened at a pivotal stage in comprehensively building a well-off society and comprehen- sively deepening reform. It was the first of its kind with the theme of the rule of law and was a landmark event in China＇s legal construction. The Journal interviewed Professor Luo Haocai, who is also president of the China Society for Human Rights Studies （CSHRS）.
基金Supported by Science Foundation for the Excellent Youth Scholars of Ministry of Education of China~~
文摘[Objective] This study was to explore the skin development law of Datong Yak.[Method]Taking Datong yaks at four various growth stages（1 day old,30 days old,180 days old and adult）as experimental materials,we studied histological structure of Datong yak skin by employing the histological methods.[Results]The skins of Datong yak at four various growth stages all showed the characteristics of thinner epidermis and thicker hypodermis,and of less capillary vessels in hypodermis and more pigment cells in epidermis.Datong yak at four various growth stages all showed a fluctuating trend in entire skin thickness,in detail thickening from 1 day old to 30 days old,then thinning to 180 days old,again thickening to adult.[Conclusion]The results provided theoretical basis for further understanding the structural characteristics of Datong yak to adapt to the abominable plateau environment.
文摘Ground surveying and mapping, field investigation and engineering drilling are adopted;A large-scale geological disaster survey was carried out along the Duku Highway (Dushanzi-Kuqa) by means of indoor tests of engineering geophysical exploration and other methods. The types and development laws of geological disasters along the line are summarized. There are 520 geological disasters along the line. 377 of them collapsed;37 landslides;106 debris flows;The collapse failure mechanism is mainly of toppling type;Debris flows are mostly gully-type torrential rain-type dilute debris flows;Landslide is mainly of rock traction type. Disasters mainly occurred during the period of concentrated rainfall;Geological disasters have certain spatial distribution characteristics. Most geological disasters are debris flow and collapse;There are fewer landslides. The results of the investigation and research have guiding and referential significance for the prevention and control of geological disasters on Duku Highway.
文摘It is very timely and necessary for us to hold this seminar in the beautiful Suzhou Campus of Renmin University of China to deeply study and implement the decisions of the Fourth Plenary Session of the 18th Communist Party of China(CPC)Central Committee,push forward the construction of China’s rule of law and jointly discuss the development of China’s human rights cause.
