As the number of diagnostic and therapeutic gastrointestinal endoscopies is increasing, and there is an increase in number of patients taking blood thinners, we are seeing more and more patients on blood thinners prio...As the number of diagnostic and therapeutic gastrointestinal endoscopies is increasing, and there is an increase in number of patients taking blood thinners, we are seeing more and more patients on blood thinners prior to endoscopic procedures. Gastrointestinal bleeding or thromboembolism can occur in this category of patients in the periendoscopic period. To better manage these patients, endoscopists should have a clear concept about the various blood thinners in the market. Patients’ risk of thromboembolism off anticoagulation, and the risk of bleeding from endoscopic procedures should be assessed prior to endoscopy. The endoscopic procedure should be done when it is safe to do it.展开更多
The application of light hydraulic support highlights the advantages of longwall top-coal caving (LTC) in thinner thick-seams (3. 0~ 5. 0 m). Considering the problems in practice, the developing of its new series will...The application of light hydraulic support highlights the advantages of longwall top-coal caving (LTC) in thinner thick-seams (3. 0~ 5. 0 m). Considering the problems in practice, the developing of its new series will promote the mining of LTC with light hydraulic supports. Some relevant technical problems of the caving technology and the future of this series of supports are analyzed in this paper with several new opinions.展开更多
According to the geological and mining technical conditions of No.18128 sub- level caving face with suspend-shift support,the first working face of the working area,the distribution laws of abutment pressure were stud...According to the geological and mining technical conditions of No.18128 sub- level caving face with suspend-shift support,the first working face of the working area,the distribution laws of abutment pressure were studied by jointly employing FIAC^(3D) numerical simulations and field tests.With the full consideration of these laws and the service time- limit of the mining district,the optimal location of the terminal mining line,should be 60 m away from the W4-B8 track dip,which was 20 m shorter than the 80 m distance deter- mined according to traditional experiences.The retained coal safety pillar for the protect- ing of dips,already proved by the industrial practice,can not only improve the rate of coal recovery and satisfy the subsequent service requirement for the following working faces, but also decrease the maintaining expenditure and thus increase profits.展开更多
This study has developed an efficient method to achieve excellent thermal dimensional stability and desired dimensions of hollow polyester fiber. Firstly,the influence of thermal treatment temperate( 140-180 ℃) on th...This study has developed an efficient method to achieve excellent thermal dimensional stability and desired dimensions of hollow polyester fiber. Firstly,the influence of thermal treatment temperate( 140-180 ℃) on the degree of shrinkage of fiber was investigated. The influence was also analyzed with a 2nd heating to simulate the application situation. It was discovered that the heat treatment at a temperature which was above the application temperature( 2nd heating) would efficiently remove the internal stress in the fiber and improve the thermal dimensional stability.Secondly,the impact of heat treatment temperature on the fiber diameter and the degree of hollowness were studied. The results implied that with a fixed fiber length, higher treatment temperature led to thinner fiber and a lower degree of hollowness.Last but not least,key parameters that could further influence the fiber dimensions were investigated. The results suggested that the fiber diameters and the degree of hollowness could be further controlled by tuning the drawing speed,the spinning meter pump output and cooling status while the spinneret parameters were fixed.展开更多
n-type CZ-Si wafers featuring longer minority carrier lifetime and higher tolerance of certain metal contamination can offer one of the best Si-based solar cells. In this study, Si heterojuction （SHJ） solar cells wh...n-type CZ-Si wafers featuring longer minority carrier lifetime and higher tolerance of certain metal contamination can offer one of the best Si-based solar cells. In this study, Si heterojuction （SHJ） solar cells which was fabricated with different wafers in the top, middle and tail positions of the ingot, exhibited a stable high efficiency of〉 22% in spite of the various profiles of the resistivity and lifetime, which demonstrated the high material utilization of n-type ingot. In addition, for effectively converting the sunlight into electrical power, the pyramid size, pyramid density and roughness of surface of the Cz-Si wafer were investigated by scanning electron microscope （SEM） and transmission electron microscope （TEM）. Furthermore, the dependence of SHJ solar cell open- circuit voltage on the surface topography was discussed, which indicated that the uniformity of surface pyramid helps to improve the open-circuit voltage and conversion efficiency. Moreover, the simulation revealed that the highest efficiency of the SHJ solar cell could be achieved by the wafer with a thickness of 100 μm. Fortunately, over 23% of the conversion efficiency of the SHJ solar cell with a wafer thickness of 100 μm was obtained based on the systematic optimization of cell fabrication process in the pilot production line. Evidently, the large availability of both n-type ingot and thinner wafer strongly supported the lower cost fabrication of high efficiency SHJ solar cell.展开更多
As they say in Hangzhou,'Leifeng Pagoda is like an old monk,and Baochu Pagoda is like a beautiful woman(雷峰如老衲,保如美人).'Leifeng Pagoda(above)can be found south of Hangzhou’s famous West Lake,and the thi...As they say in Hangzhou,'Leifeng Pagoda is like an old monk,and Baochu Pagoda is like a beautiful woman(雷峰如老衲,保如美人).'Leifeng Pagoda(above)can be found south of Hangzhou’s famous West Lake,and the thinner Baochu Pagoda is located north of West Lake atop BaosHill.Both were originally builin the tenth century.展开更多
话题是人们的体形。市面上琳琅满目的减肥药物和运动器械折射出人们“喜瘦怕胖”的心态。可有些人怎么减肥也收效不大,于是对药物减肥法产生怀疑,相继提出了“运动减肥论”和“基因决定论”,在以上各家争执不下时,本文却另辟蹊径,提出...话题是人们的体形。市面上琳琅满目的减肥药物和运动器械折射出人们“喜瘦怕胖”的心态。可有些人怎么减肥也收效不大,于是对药物减肥法产生怀疑,相继提出了“运动减肥论”和“基因决定论”,在以上各家争执不下时,本文却另辟蹊径,提出了“非锻炼性运动产热减肥论”。这个拗口的名字来源于non-exercise actvity thermogenesis.简称NEAT。文章特别强调,这种运动不同于一般的体育运动,而是如题目所言的little daily habits,象 fidgeting, stretching, toe-tapping等。不要以为这些“小动作”不起眼,据科学实验.NEAT proved to be theprincipal mediator of resistance to fat gain with overfeeding。其作用竟然大大超过另外三种耗能方式(详见下文)。包括体育运动。最后的结论是:…higherlevels of fidgeting and other non-exercise movements may be a key factor indetermining which of us gain weight easily。 遗憾的是连专家们也弄不清这种消耗能量的方式为什么会有个体差异,但全文从头至尾似于一直在暗示读者:NEAT并非先天注定,而是可以逐步培养的习惯。那么,受身体发福困扰的朋友不妨拿出一点决心和恒心,试试这些“小动作”。展开更多
文摘As the number of diagnostic and therapeutic gastrointestinal endoscopies is increasing, and there is an increase in number of patients taking blood thinners, we are seeing more and more patients on blood thinners prior to endoscopic procedures. Gastrointestinal bleeding or thromboembolism can occur in this category of patients in the periendoscopic period. To better manage these patients, endoscopists should have a clear concept about the various blood thinners in the market. Patients’ risk of thromboembolism off anticoagulation, and the risk of bleeding from endoscopic procedures should be assessed prior to endoscopy. The endoscopic procedure should be done when it is safe to do it.
文摘The application of light hydraulic support highlights the advantages of longwall top-coal caving (LTC) in thinner thick-seams (3. 0~ 5. 0 m). Considering the problems in practice, the developing of its new series will promote the mining of LTC with light hydraulic supports. Some relevant technical problems of the caving technology and the future of this series of supports are analyzed in this paper with several new opinions.
基金the National Natural Science Foundation of China(50674002)the Educational Department of Anhui Province(KJ2008B109)
文摘According to the geological and mining technical conditions of No.18128 sub- level caving face with suspend-shift support,the first working face of the working area,the distribution laws of abutment pressure were studied by jointly employing FIAC^(3D) numerical simulations and field tests.With the full consideration of these laws and the service time- limit of the mining district,the optimal location of the terminal mining line,should be 60 m away from the W4-B8 track dip,which was 20 m shorter than the 80 m distance deter- mined according to traditional experiences.The retained coal safety pillar for the protect- ing of dips,already proved by the industrial practice,can not only improve the rate of coal recovery and satisfy the subsequent service requirement for the following working faces, but also decrease the maintaining expenditure and thus increase profits.
基金Innovation Fund Project of National Commercial Aircraft Manufacturing Engineering Research Center(No.SAM C14-JS-15-048)Natural Science Foundation of Shanghai,China(No.13ZR1400400)the Fundamental Research Funds for the Central Universities,China
文摘This study has developed an efficient method to achieve excellent thermal dimensional stability and desired dimensions of hollow polyester fiber. Firstly,the influence of thermal treatment temperate( 140-180 ℃) on the degree of shrinkage of fiber was investigated. The influence was also analyzed with a 2nd heating to simulate the application situation. It was discovered that the heat treatment at a temperature which was above the application temperature( 2nd heating) would efficiently remove the internal stress in the fiber and improve the thermal dimensional stability.Secondly,the impact of heat treatment temperature on the fiber diameter and the degree of hollowness were studied. The results implied that with a fixed fiber length, higher treatment temperature led to thinner fiber and a lower degree of hollowness.Last but not least,key parameters that could further influence the fiber dimensions were investigated. The results suggested that the fiber diameters and the degree of hollowness could be further controlled by tuning the drawing speed,the spinning meter pump output and cooling status while the spinneret parameters were fixed.
文摘n-type CZ-Si wafers featuring longer minority carrier lifetime and higher tolerance of certain metal contamination can offer one of the best Si-based solar cells. In this study, Si heterojuction （SHJ） solar cells which was fabricated with different wafers in the top, middle and tail positions of the ingot, exhibited a stable high efficiency of〉 22% in spite of the various profiles of the resistivity and lifetime, which demonstrated the high material utilization of n-type ingot. In addition, for effectively converting the sunlight into electrical power, the pyramid size, pyramid density and roughness of surface of the Cz-Si wafer were investigated by scanning electron microscope （SEM） and transmission electron microscope （TEM）. Furthermore, the dependence of SHJ solar cell open- circuit voltage on the surface topography was discussed, which indicated that the uniformity of surface pyramid helps to improve the open-circuit voltage and conversion efficiency. Moreover, the simulation revealed that the highest efficiency of the SHJ solar cell could be achieved by the wafer with a thickness of 100 μm. Fortunately, over 23% of the conversion efficiency of the SHJ solar cell with a wafer thickness of 100 μm was obtained based on the systematic optimization of cell fabrication process in the pilot production line. Evidently, the large availability of both n-type ingot and thinner wafer strongly supported the lower cost fabrication of high efficiency SHJ solar cell.
文摘As they say in Hangzhou,'Leifeng Pagoda is like an old monk,and Baochu Pagoda is like a beautiful woman(雷峰如老衲,保如美人).'Leifeng Pagoda(above)can be found south of Hangzhou’s famous West Lake,and the thinner Baochu Pagoda is located north of West Lake atop BaosHill.Both were originally builin the tenth century.
文摘话题是人们的体形。市面上琳琅满目的减肥药物和运动器械折射出人们“喜瘦怕胖”的心态。可有些人怎么减肥也收效不大,于是对药物减肥法产生怀疑,相继提出了“运动减肥论”和“基因决定论”,在以上各家争执不下时,本文却另辟蹊径,提出了“非锻炼性运动产热减肥论”。这个拗口的名字来源于non-exercise actvity thermogenesis.简称NEAT。文章特别强调,这种运动不同于一般的体育运动,而是如题目所言的little daily habits,象 fidgeting, stretching, toe-tapping等。不要以为这些“小动作”不起眼,据科学实验.NEAT proved to be theprincipal mediator of resistance to fat gain with overfeeding。其作用竟然大大超过另外三种耗能方式(详见下文)。包括体育运动。最后的结论是:…higherlevels of fidgeting and other non-exercise movements may be a key factor indetermining which of us gain weight easily。 遗憾的是连专家们也弄不清这种消耗能量的方式为什么会有个体差异,但全文从头至尾似于一直在暗示读者:NEAT并非先天注定,而是可以逐步培养的习惯。那么,受身体发福困扰的朋友不妨拿出一点决心和恒心,试试这些“小动作”。
