To predict joint development characteristics of coal seams, joint characteristics of rock seams from 88field stations were observed and comparisons were made between joint characteristics of coal and rock seams at 10 ...To predict joint development characteristics of coal seams, joint characteristics of rock seams from 88field stations were observed and comparisons were made between joint characteristics of coal and rock seams at 10 coal outcrops. Additionally, detailed joint measurements of underground coal seams were taken at two coal mines. This study investigated the effects of seam thickness, lithology, and structure on joint development and established the relationship between joint development of coal and rock seams, which allowed predictions of predominant joint densities for the No.5 coal seam in the southeastern margin of the Ordos basin. The results show that outcrop and underground coal seams exhibit the same joint systems as rock seams. The joints are mainly upright. Predominant joints strike 55° on average, followed by joints striking 320°. The joint density of the coal seam is 18.7–22.5 times that of the sandstone seam at the same thickness. The predominant joint density of the No.5 coal seam, controlled by the structure, is 4–20 joints per meter. Joint densities exhibit high values at intersecting areas of faults and folds and decrease values in structurally stable areas. The permeability increases exponentially with increasing density of the predominant joints.展开更多
Promoting the construction of Guangdong-Hong Kong-Macao Greater Bay Area is a major policy decision and national strategy made by the central government of China,which significantly supports the Belt and Road Initiati...Promoting the construction of Guangdong-Hong Kong-Macao Greater Bay Area is a major policy decision and national strategy made by the central government of China,which significantly supports the Belt and Road Initiative and maintains the long-term prosperity for the whole country.As an important part of the Guangdong-Hong Kong-Macao Greater Bay Area,Foshan needs to find its own position and direction in order to accelerate the joint development with other cities through five measures.展开更多
On November 27,2017,under the government cooperation framework of China and Thailand,Beijing Tengyuxinwei Technology Co.,Ltd.（BTTCL）,affiliated to the China Great Wall Industry Corporation（CGWIC）,signed a MOU of‘...On November 27,2017,under the government cooperation framework of China and Thailand,Beijing Tengyuxinwei Technology Co.,Ltd.（BTTCL）,affiliated to the China Great Wall Industry Corporation（CGWIC）,signed a MOU of‘Joint Construction of HONGYAN-SAT Constellation’with Thailand Kasetsart University（KU）.Under this MOU,展开更多
Commercial production of unconventional oil and gas resources will not be easily achieved without large-scale engineering measures,let alone the additional operation cost,increasingly stricter requirement for safety a...Commercial production of unconventional oil and gas resources will not be easily achieved without large-scale engineering measures,let alone the additional operation cost,increasingly stricter requirement for safety and environment,fluctuating low oil and gas prices,etc.,defeating the confidence of those investors.Therefore,unconventional measures are urgently needed to guide the exploration and exploitation of unconventional oil and gas resources.Thus,we put forward the concept of joint exploration and development by integrating research methodologies and operating techniques for a variety of oil and gas resources to simultaneously achieve analysis,construction,gathering and exploitation of multiple hydrocarbon sources.In this way,the annoying interference between the produced mixture of hydrocarbon flow resulting in the reduction of single-well flowrate will be possibly turned into a dynamic mutual force to enhance the well's flowrate.We also point out that the inevitability of joint exploration and development is determined by the occurrence conditions of oil and gas resources,its feasibility relies on the advancement of technologies,and its arduous and long-term nature is attributed to the current energy market and environment.In spite of various problems and difficulties,we believe that joint exploration and development will be a feasible option to achieve both cost reduction and production&benefit enhancement,boost investors'confidence,raise energy comprehensive utilization,and enhance energy supply efficiency.In conclusion,the advantages of joint exploration and development outweigh its disadvantages for both countries and enterprises.展开更多
The internal development and outsourced development of information systems have been studied intensively, but little research has been conducted on the joint development mode. This paper describes the benefits and pro...The internal development and outsourced development of information systems have been studied intensively, but little research has been conducted on the joint development mode. This paper describes the benefits and problems encountered in the joint development of accounting management information systems based on a real case. The case illustrates some distinct advantages, such as full control over the development schedule, the flexibility with resource allocation, and insurance for sustained active participation by the end-users. However, this development mode also involves potential problems, e.g., potential conflicts arising from diverse backgrounds and cultures of the various stakeholders and challenges to manage personnel from outside partners.展开更多
There is a long tradition of friendly exchange and cooperation between the Chinese Academy of Sciences (CAS) and the universities in Hong Kong. In recent years, both sides have been increasingly realizing the importan...There is a long tradition of friendly exchange and cooperation between the Chinese Academy of Sciences (CAS) and the universities in Hong Kong. In recent years, both sides have been increasingly realizing the importance of furthering their Collaboration and exchange and the cooperation has become more active, laying greater展开更多
The uncertainty of distributed generation energy has dramatically challenged the coordinated development of distribution networks at all levels.This paper focuses on the multi-time-scale regulation model of distribute...The uncertainty of distributed generation energy has dramatically challenged the coordinated development of distribution networks at all levels.This paper focuses on the multi-time-scale regulation model of distributed generation energy under normal conditions.The simulation results of the example verify the self-optimization characteristics and the effectiveness of real-time dispatching of the distribution network control technology at all levels under multiple time scales.展开更多
目的:探究髋关节镜手术治疗临界型发育性髋关节发育不良(borderline developmental dysplasia of the hip,BDDH)患者的早期疗效及安全性。方法:选取2020年1月至2022年12月确诊为BDDH的患者111例,根据手术方法分为两组,其中63例患者行关...目的:探究髋关节镜手术治疗临界型发育性髋关节发育不良(borderline developmental dysplasia of the hip,BDDH)患者的早期疗效及安全性。方法:选取2020年1月至2022年12月确诊为BDDH的患者111例,根据手术方法分为两组,其中63例患者行关节镜手术为关节镜组,男22例,女41例,年龄(35.67±6.83)岁;48例患者行髋臼周围截骨术(periacetabular osteotomy,PAO)为PAO组,男18例,女30例,年龄(36.85±7.10)岁。记录两组患者的手术时间、住院时间、出血量、康复时间、并发症发生率、再手术率。测量并记录两组患者影像学指标。分别采用改良Harris髋关节功能评分(modified Harris hip score,mHHS)、非骨关节炎髋关节评分(nonarthritic hip score,NAHS)、髋关节结果评分日常生活能力量表(hip outcome score activity of daily living scale,HOS-ADL)评估患者术前及术后的髋关节功能及生活质量。结果:所有患者获得随访,时间为12个月。关节镜组患者的手术时间(90.43±9.85)min、住院时间(4.32±0.56)d及康复时间(15.22±2.15)周、出血量(25.69±6.57)ml、发生并发症15例均低于PAO组(117.25±15.83)min、(5.81±0.92)d、(21.10±3.74)周、(358.52±126.73)ml、30例,差异均有统计学意义(P<0.05)。关节镜组治疗后末次随访外侧中心边缘角(lateral center edge angle,LCEA)为(19.82±1.90)°、前方中心边缘角(anterior center edge angle,ACEA)为(20.01±1.85)°均较治疗前(21.43±2.10)°、(21.54±2.05)°下降,但PAO组治疗后末次随访LCEA(33.03±3.45)°、ACEA为(33.48±4.22)°均较治疗前上升,差异均有统计学意义(P<0.05)。关节镜组的T?nnis角治疗后(11.05±1.83)°较治疗前上升,PAO组治疗后末次随访(2.98±0.75)°较治疗前下降,差异均有统计学意义(P<0.05)。关节镜组治疗后外凸指数(30.68±2.85)及T?nnis分级较治疗前均有改善,α角治疗后(38.79±4.27)°较治疗前明显下降,差异有统计学意义(P<0.05);PAO组治疗后外凸指数(15.03±2.18)、α角(53.58±6.02)较治疗前均明显下降,差异有统计学意义(P<0.05)。关节镜组治疗后末次随访mHSS评分(86.41±7.33)分均高于PAO组(81.02±6.49)分,差异有统计学意义(P<0.05)。关节镜组治疗后6个月NAHS为(69.83±6.53)分、HOS-ADL评分(78.84±7.39)分高于PAO组(64.10±6.02)分、(75.31±7.01)分,差异有统计学意义(P<0.01);关节镜组治疗后末次随访NAHS为(87.63±7.60)分、HOS-ADL评分(88.94±8.11)分高于PAO组(81.63±7.03)分、(83.63±7.92)分,差异均有统计学意义(P<0.05)。结论:髋关节镜手术相较于PAO手术,治疗BDDH患者具有更好的早中期临床疗效;但PAO在改善BDDH患者的髋臼影像学指标方面更具优势,而髋关节镜仅改善患者α角。同时髋关节镜手术对患者造成的创伤更小,减少出血量,更易于患者的后续恢复。展开更多
基金Financial support for this work, provided by the National Science and Technology Major Project (No. 2011ZX05034-001)
文摘To predict joint development characteristics of coal seams, joint characteristics of rock seams from 88field stations were observed and comparisons were made between joint characteristics of coal and rock seams at 10 coal outcrops. Additionally, detailed joint measurements of underground coal seams were taken at two coal mines. This study investigated the effects of seam thickness, lithology, and structure on joint development and established the relationship between joint development of coal and rock seams, which allowed predictions of predominant joint densities for the No.5 coal seam in the southeastern margin of the Ordos basin. The results show that outcrop and underground coal seams exhibit the same joint systems as rock seams. The joints are mainly upright. Predominant joints strike 55° on average, followed by joints striking 320°. The joint density of the coal seam is 18.7–22.5 times that of the sandstone seam at the same thickness. The predominant joint density of the No.5 coal seam, controlled by the structure, is 4–20 joints per meter. Joint densities exhibit high values at intersecting areas of faults and folds and decrease values in structurally stable areas. The permeability increases exponentially with increasing density of the predominant joints.
文摘Promoting the construction of Guangdong-Hong Kong-Macao Greater Bay Area is a major policy decision and national strategy made by the central government of China,which significantly supports the Belt and Road Initiative and maintains the long-term prosperity for the whole country.As an important part of the Guangdong-Hong Kong-Macao Greater Bay Area,Foshan needs to find its own position and direction in order to accelerate the joint development with other cities through five measures.
文摘On November 27,2017,under the government cooperation framework of China and Thailand,Beijing Tengyuxinwei Technology Co.,Ltd.（BTTCL）,affiliated to the China Great Wall Industry Corporation（CGWIC）,signed a MOU of‘Joint Construction of HONGYAN-SAT Constellation’with Thailand Kasetsart University（KU）.Under this MOU,
文摘Commercial production of unconventional oil and gas resources will not be easily achieved without large-scale engineering measures,let alone the additional operation cost,increasingly stricter requirement for safety and environment,fluctuating low oil and gas prices,etc.,defeating the confidence of those investors.Therefore,unconventional measures are urgently needed to guide the exploration and exploitation of unconventional oil and gas resources.Thus,we put forward the concept of joint exploration and development by integrating research methodologies and operating techniques for a variety of oil and gas resources to simultaneously achieve analysis,construction,gathering and exploitation of multiple hydrocarbon sources.In this way,the annoying interference between the produced mixture of hydrocarbon flow resulting in the reduction of single-well flowrate will be possibly turned into a dynamic mutual force to enhance the well's flowrate.We also point out that the inevitability of joint exploration and development is determined by the occurrence conditions of oil and gas resources,its feasibility relies on the advancement of technologies,and its arduous and long-term nature is attributed to the current energy market and environment.In spite of various problems and difficulties,we believe that joint exploration and development will be a feasible option to achieve both cost reduction and production&benefit enhancement,boost investors'confidence,raise energy comprehensive utilization,and enhance energy supply efficiency.In conclusion,the advantages of joint exploration and development outweigh its disadvantages for both countries and enterprises.
基金Supported partially by the National Natural Science Foundation of China (No. 70671103) a special grant from the Renmin Uni-versity of China
文摘The internal development and outsourced development of information systems have been studied intensively, but little research has been conducted on the joint development mode. This paper describes the benefits and problems encountered in the joint development of accounting management information systems based on a real case. The case illustrates some distinct advantages, such as full control over the development schedule, the flexibility with resource allocation, and insurance for sustained active participation by the end-users. However, this development mode also involves potential problems, e.g., potential conflicts arising from diverse backgrounds and cultures of the various stakeholders and challenges to manage personnel from outside partners.
文摘There is a long tradition of friendly exchange and cooperation between the Chinese Academy of Sciences (CAS) and the universities in Hong Kong. In recent years, both sides have been increasingly realizing the importance of furthering their Collaboration and exchange and the cooperation has become more active, laying greater
文摘The uncertainty of distributed generation energy has dramatically challenged the coordinated development of distribution networks at all levels.This paper focuses on the multi-time-scale regulation model of distributed generation energy under normal conditions.The simulation results of the example verify the self-optimization characteristics and the effectiveness of real-time dispatching of the distribution network control technology at all levels under multiple time scales.
文摘目的:探究髋关节镜手术治疗临界型发育性髋关节发育不良(borderline developmental dysplasia of the hip,BDDH)患者的早期疗效及安全性。方法:选取2020年1月至2022年12月确诊为BDDH的患者111例,根据手术方法分为两组,其中63例患者行关节镜手术为关节镜组,男22例,女41例,年龄(35.67±6.83)岁;48例患者行髋臼周围截骨术(periacetabular osteotomy,PAO)为PAO组,男18例,女30例,年龄(36.85±7.10)岁。记录两组患者的手术时间、住院时间、出血量、康复时间、并发症发生率、再手术率。测量并记录两组患者影像学指标。分别采用改良Harris髋关节功能评分(modified Harris hip score,mHHS)、非骨关节炎髋关节评分(nonarthritic hip score,NAHS)、髋关节结果评分日常生活能力量表(hip outcome score activity of daily living scale,HOS-ADL)评估患者术前及术后的髋关节功能及生活质量。结果:所有患者获得随访,时间为12个月。关节镜组患者的手术时间(90.43±9.85)min、住院时间(4.32±0.56)d及康复时间(15.22±2.15)周、出血量(25.69±6.57)ml、发生并发症15例均低于PAO组(117.25±15.83)min、(5.81±0.92)d、(21.10±3.74)周、(358.52±126.73)ml、30例,差异均有统计学意义(P<0.05)。关节镜组治疗后末次随访外侧中心边缘角(lateral center edge angle,LCEA)为(19.82±1.90)°、前方中心边缘角(anterior center edge angle,ACEA)为(20.01±1.85)°均较治疗前(21.43±2.10)°、(21.54±2.05)°下降,但PAO组治疗后末次随访LCEA(33.03±3.45)°、ACEA为(33.48±4.22)°均较治疗前上升,差异均有统计学意义(P<0.05)。关节镜组的T?nnis角治疗后(11.05±1.83)°较治疗前上升,PAO组治疗后末次随访(2.98±0.75)°较治疗前下降,差异均有统计学意义(P<0.05)。关节镜组治疗后外凸指数(30.68±2.85)及T?nnis分级较治疗前均有改善,α角治疗后(38.79±4.27)°较治疗前明显下降,差异有统计学意义(P<0.05);PAO组治疗后外凸指数(15.03±2.18)、α角(53.58±6.02)较治疗前均明显下降,差异有统计学意义(P<0.05)。关节镜组治疗后末次随访mHSS评分(86.41±7.33)分均高于PAO组(81.02±6.49)分,差异有统计学意义(P<0.05)。关节镜组治疗后6个月NAHS为(69.83±6.53)分、HOS-ADL评分(78.84±7.39)分高于PAO组(64.10±6.02)分、(75.31±7.01)分,差异有统计学意义(P<0.01);关节镜组治疗后末次随访NAHS为(87.63±7.60)分、HOS-ADL评分(88.94±8.11)分高于PAO组(81.63±7.03)分、(83.63±7.92)分,差异均有统计学意义(P<0.05)。结论:髋关节镜手术相较于PAO手术,治疗BDDH患者具有更好的早中期临床疗效;但PAO在改善BDDH患者的髋臼影像学指标方面更具优势,而髋关节镜仅改善患者α角。同时髋关节镜手术对患者造成的创伤更小,减少出血量,更易于患者的后续恢复。
