AIM:To evaluate the safety and effectiveness of twostage vs single-stage management for concomitant gallstones and common bile duct stones.METHODS:Four databases,including PubMed,Embase,the Cochrane Central Register o...AIM:To evaluate the safety and effectiveness of twostage vs single-stage management for concomitant gallstones and common bile duct stones.METHODS:Four databases,including PubMed,Embase,the Cochrane Central Register of Controlled Trials and the Science Citation Index up to September 2011,were searched to identify all randomized controlled trials(RCTs).Data were extracted from the studies by two independent reviewers.The primary outcomes were stone clearance from the common bile duct,postoperative morbidity and mortality.The secondary outcomes were conversion to other procedures,number of procedures per patient,length of hospital stay,total operative time,hospitalization charges,patient acceptance and quality of life scores.RESULTS:Seven eligible RCTs [five trials(n = 621) comparing preoperative endoscopic retrograde cholangiopancreatography(ERCP)/endoscopic sphincterotomy(EST) + laparoscopic cholecystectomy(LC) with LC + laparoscopic common bile duct exploration(LCBDE);two trials(n = 166) comparing postoperative ERCP/EST + LC with LC + LCBDE],composed of 787 patients in total,were included in the final analysis.The metaanalysis detected no statistically significant difference between the two groups in stone clearance from the common bile duct [risk ratios(RR) =-0.10,95% confidence intervals(CI):-0.24 to 0.04,P = 0.17],postoperative morbidity(RR = 0.79,95% CI:0.58 to 1.10,P = 0.16),mortality(RR = 2.19,95% CI:0.33 to 14.67,P = 0.42),conversion to other procedures(RR = 1.21,95% CI:0.54 to 2.70,P = 0.39),length of hospital stay(MD = 0.99,95% CI:-1.59 to 3.57,P = 0.45),total operative time(MD = 12.14,95% CI:-1.83 to 26.10,P = 0.09).Two-stage(LC + ERCP/EST) management clearly required more procedures per patient than single-stage(LC + LCBDE) management.CONCLUSION:Single-stage management is equivalent to two-stage management but requires fewer procedures.However,patient's condition,operator's expertise and local resources should be taken into account in making treatment decisions.展开更多
This study proposes a method to derive the climatological limit thresholds that can be used in an operational/historical quality control procedure for Chinese high vertical resolution(5–10 m)radiosonde temperature an...This study proposes a method to derive the climatological limit thresholds that can be used in an operational/historical quality control procedure for Chinese high vertical resolution(5–10 m)radiosonde temperature and wind speed data.The whole atmosphere is divided into 64 vertical bins,and the profiles are constructed by the percentiles of the values in each vertical bin.Based on the percentile profiles(PPs),some objective criteria are developed to obtain the thresholds.Tibetan Plateau field data are used to validate the effectiveness of the method in the application of experimental data.The results show that the derived thresholds for 120 operational stations and 3 experimental stations are effective in detecting the gross errors,and those PPs can clearly and instantly illustrate the characteristics of a radiosonde variable and reveal the distribution of errors.展开更多
A feld study was set up to compare dry matter accumulation and grain yield of 3 different types of flm mulching, namely FFC （full flm muched on tiny ridges covered with soil）, PFC （full flm muched covered with soil...A feld study was set up to compare dry matter accumulation and grain yield of 3 different types of flm mulching, namely FFC （full flm muched on tiny ridges covered with soil）, PFC （full flm muched covered with soil）, and PF （full flm muched with no cover）. The experiment was laid out in a complete random design with 3 replications at north-west （34°40′N, 105°06′E） of China. This study determined that （1） flm mulching treatment increased leaf area and dry matter accumulation of oil fax in semi-arid areas; （2） accu-mulation of dry matter under PFC treatment was markedly higher than other treatments except anthesis stage; （3） average grain yield of oil fax under flm mulching treatment was 52.67%-60.33% higher than fat plot without mulched or ridge （CK） treatment; （4） grain yield of oil fax was substantially correlated with plant height, grain number and 1,000 kernels weight. This study demonstrated that flm mulching has signifcant effects on crop grain yield improvement in the northwest of China.展开更多
AIM:To compare non-liquid and clear-liquid diets,and to assess whether the latter is the optimal treatment for mild acute pancreatitis.METHODS:The Cochrane Library,PUBMED,EMBASE,EBM review databases,Science Citation I...AIM:To compare non-liquid and clear-liquid diets,and to assess whether the latter is the optimal treatment for mild acute pancreatitis.METHODS:The Cochrane Library,PUBMED,EMBASE,EBM review databases,Science Citation Index Expanded,and several Chinese databases were searched up to March 2011.Randomized controlled trials(RCTs) that compared non-liquid with clear-liquid diets in patients with mild acute pancreatitis were included.A meta-analysis was performed using available evidence from RCTs.RESULTS:Three RCTs of adequate quality involving a total of 362 participants were included in the final analysis.Compared to liquid diet,non-liquid diet significantly decreased the length of hospitalization [mean difference(MD):1.18,95% CI:0.82-1.55;P﹤0.00001] and total length of hospitalization(MD:1.31,95% CI:0.45-2.17;P = 0.003).The subgroup analysis showed solid diet was more favorable than clear liquid diet in the length of hospitalization,with a pooled MD being-1.05(95% CI:-1.43 to-0.66;P﹤0.00001).However,compared with clear liquid diet,both soft and solid diets did not show any significant differences for recurrence of pain after re-feeding,either alone [relative risk(RR):0.95;95% CI:0.51-1.87;P = 0.88] and(RR:1.22;95% CI:0.69-2.16;P = 0.49),respectively,or analyzed together as non-liquid diet(RR:0.80;95% CI:0.47-1.36;P = 0.41).CONCLUSION:The non-liquid soft or solid diet did not increase pain recurrence after re-feeding,compared with the clear-liquid diet.The non-liquid diet reduced hospitalization.展开更多
This paper reviews the recoverable satellites China has developed over the past forty years.The main missions,technical specifications,scientific and technical experiments of these satellites,including the SJ-10 scien...This paper reviews the recoverable satellites China has developed over the past forty years.The main missions,technical specifications,scientific and technical experiments of these satellites,including the SJ-10 scientific experiment satellite launched on April 6,2016 are introduced.Recommendations for future technical upgrades for recoverable satellites are also proposed in the paper.展开更多
Investigation of seismic performance of buildings with STRP （scrap tire rubber pad） seismic isolators by means of pseudo-dynamic tests and numerical simulation is presented. The isolated building is numerically mode...Investigation of seismic performance of buildings with STRP （scrap tire rubber pad） seismic isolators by means of pseudo-dynamic tests and numerical simulation is presented. The isolated building is numerically modeled, while the base isolation layer is considered as the experimental substructure in the pseudo-dynamic tests. The test result verifies that the STRP isolator shows acceptable shear deformation performance predicted by the design methods, and demonstrated that seismic isolation using STRP works as a protective measure to provide enhanced seismic performance of the building indicated by the reduction of top floor absolute acceleration, drift and base shear as designated.展开更多
With science and technology development,vibration testing as the most important item in reliability test is becoming more and more important,at the same time,vibrate condition becoming more and more complicated,the ph...With science and technology development,vibration testing as the most important item in reliability test is becoming more and more important,at the same time,vibrate condition becoming more and more complicated,the phenomenon increases that the output of controller goes beyond controlling range so that destroy the specimen. In this paper,some skills such as how to set the parameters of force controller,where to place the sensor,which material to be chosen and which skills to be used while making jigs were introduced to avoid the just matter. At last,some examples were given to prove the validity of the method proposed.展开更多
Laparoscopic surgery is a recent minimally invasive technological innovation that conforms to the idea of endoscopic surgery. With the rapid development of science and technology, gynecological surgery has been widely...Laparoscopic surgery is a recent minimally invasive technological innovation that conforms to the idea of endoscopic surgery. With the rapid development of science and technology, gynecological surgery has been widely used laparoscopic technology, greatly improved the gynecological problems. The survey found that China＇s laparoscopic technology and foreign laparoscopic technology were the same leveL Laparoscopic technology has become more and more mature in recent years, laparoscopic technology in the field of gynecology has been applied year after year, after many clinical trials, gets some experience and progress. This article explores the development of laparoscopic surgery in the field of gynecology and the limitations and solutions to discuss, promoting gynecological development, so that the majority of patients benefit from it.展开更多
The Dark Matter Particle Explorer(DAMPE) is the first high energy detector satellite in China,whose physics goal is to find evidence of the existence of dark matter particles by investigating the composition and energ...The Dark Matter Particle Explorer(DAMPE) is the first high energy detector satellite in China,whose physics goal is to find evidence of the existence of dark matter particles by investigating the composition and energy spectra of primary cosmic rays,especially those for electrons,positrons and gamma rays,over the dynamic range from 5 Ge V to 10 Te V.DAMPE is a satellite launched by China with the largest payload ratio,where the payload is composed of a BGO(Bismuth Germanate Oxide) Calorimeter,a Plastic Scintillator Detector,a Silicon Tungsten Tracker and a Neutron Detector.This paper introduces the technical scheme of DAMPE,including requirement analysis,composition,technical innovation,on-orbit status and prospect of development for the future.展开更多
文摘AIM:To evaluate the safety and effectiveness of twostage vs single-stage management for concomitant gallstones and common bile duct stones.METHODS:Four databases,including PubMed,Embase,the Cochrane Central Register of Controlled Trials and the Science Citation Index up to September 2011,were searched to identify all randomized controlled trials(RCTs).Data were extracted from the studies by two independent reviewers.The primary outcomes were stone clearance from the common bile duct,postoperative morbidity and mortality.The secondary outcomes were conversion to other procedures,number of procedures per patient,length of hospital stay,total operative time,hospitalization charges,patient acceptance and quality of life scores.RESULTS:Seven eligible RCTs [five trials(n = 621) comparing preoperative endoscopic retrograde cholangiopancreatography(ERCP)/endoscopic sphincterotomy(EST) + laparoscopic cholecystectomy(LC) with LC + laparoscopic common bile duct exploration(LCBDE);two trials(n = 166) comparing postoperative ERCP/EST + LC with LC + LCBDE],composed of 787 patients in total,were included in the final analysis.The metaanalysis detected no statistically significant difference between the two groups in stone clearance from the common bile duct [risk ratios(RR) =-0.10,95% confidence intervals(CI):-0.24 to 0.04,P = 0.17],postoperative morbidity(RR = 0.79,95% CI:0.58 to 1.10,P = 0.16),mortality(RR = 2.19,95% CI:0.33 to 14.67,P = 0.42),conversion to other procedures(RR = 1.21,95% CI:0.54 to 2.70,P = 0.39),length of hospital stay(MD = 0.99,95% CI:-1.59 to 3.57,P = 0.45),total operative time(MD = 12.14,95% CI:-1.83 to 26.10,P = 0.09).Two-stage(LC + ERCP/EST) management clearly required more procedures per patient than single-stage(LC + LCBDE) management.CONCLUSION:Single-stage management is equivalent to two-stage management but requires fewer procedures.However,patient's condition,operator's expertise and local resources should be taken into account in making treatment decisions.
基金supported by the National Innovation Project for Meteorological Science and Technology grant number CMAGGTD003-5the National Key R&D Program of China grant number2017YFC1501801。
文摘This study proposes a method to derive the climatological limit thresholds that can be used in an operational/historical quality control procedure for Chinese high vertical resolution(5–10 m)radiosonde temperature and wind speed data.The whole atmosphere is divided into 64 vertical bins,and the profiles are constructed by the percentiles of the values in each vertical bin.Based on the percentile profiles(PPs),some objective criteria are developed to obtain the thresholds.Tibetan Plateau field data are used to validate the effectiveness of the method in the application of experimental data.The results show that the derived thresholds for 120 operational stations and 3 experimental stations are effective in detecting the gross errors,and those PPs can clearly and instantly illustrate the characteristics of a radiosonde variable and reveal the distribution of errors.
基金financial support provided by China Agriculture Research System of Construct Special (CARS-14-116)the National Natural Science Programs of China (31360315, 31460331)Fuxi Outstanding Talent Cultivation Plan of Gansu Agricultural University (Gaufx-02J05)
文摘A feld study was set up to compare dry matter accumulation and grain yield of 3 different types of flm mulching, namely FFC （full flm muched on tiny ridges covered with soil）, PFC （full flm muched covered with soil）, and PF （full flm muched with no cover）. The experiment was laid out in a complete random design with 3 replications at north-west （34°40′N, 105°06′E） of China. This study determined that （1） flm mulching treatment increased leaf area and dry matter accumulation of oil fax in semi-arid areas; （2） accu-mulation of dry matter under PFC treatment was markedly higher than other treatments except anthesis stage; （3） average grain yield of oil fax under flm mulching treatment was 52.67%-60.33% higher than fat plot without mulched or ridge （CK） treatment; （4） grain yield of oil fax was substantially correlated with plant height, grain number and 1,000 kernels weight. This study demonstrated that flm mulching has signifcant effects on crop grain yield improvement in the northwest of China.
文摘AIM:To compare non-liquid and clear-liquid diets,and to assess whether the latter is the optimal treatment for mild acute pancreatitis.METHODS:The Cochrane Library,PUBMED,EMBASE,EBM review databases,Science Citation Index Expanded,and several Chinese databases were searched up to March 2011.Randomized controlled trials(RCTs) that compared non-liquid with clear-liquid diets in patients with mild acute pancreatitis were included.A meta-analysis was performed using available evidence from RCTs.RESULTS:Three RCTs of adequate quality involving a total of 362 participants were included in the final analysis.Compared to liquid diet,non-liquid diet significantly decreased the length of hospitalization [mean difference(MD):1.18,95% CI:0.82-1.55;P﹤0.00001] and total length of hospitalization(MD:1.31,95% CI:0.45-2.17;P = 0.003).The subgroup analysis showed solid diet was more favorable than clear liquid diet in the length of hospitalization,with a pooled MD being-1.05(95% CI:-1.43 to-0.66;P﹤0.00001).However,compared with clear liquid diet,both soft and solid diets did not show any significant differences for recurrence of pain after re-feeding,either alone [relative risk(RR):0.95;95% CI:0.51-1.87;P = 0.88] and(RR:1.22;95% CI:0.69-2.16;P = 0.49),respectively,or analyzed together as non-liquid diet(RR:0.80;95% CI:0.47-1.36;P = 0.41).CONCLUSION:The non-liquid soft or solid diet did not increase pain recurrence after re-feeding,compared with the clear-liquid diet.The non-liquid diet reduced hospitalization.
文摘This paper reviews the recoverable satellites China has developed over the past forty years.The main missions,technical specifications,scientific and technical experiments of these satellites,including the SJ-10 scientific experiment satellite launched on April 6,2016 are introduced.Recommendations for future technical upgrades for recoverable satellites are also proposed in the paper.
文摘Investigation of seismic performance of buildings with STRP （scrap tire rubber pad） seismic isolators by means of pseudo-dynamic tests and numerical simulation is presented. The isolated building is numerically modeled, while the base isolation layer is considered as the experimental substructure in the pseudo-dynamic tests. The test result verifies that the STRP isolator shows acceptable shear deformation performance predicted by the design methods, and demonstrated that seismic isolation using STRP works as a protective measure to provide enhanced seismic performance of the building indicated by the reduction of top floor absolute acceleration, drift and base shear as designated.
文摘With science and technology development,vibration testing as the most important item in reliability test is becoming more and more important,at the same time,vibrate condition becoming more and more complicated,the phenomenon increases that the output of controller goes beyond controlling range so that destroy the specimen. In this paper,some skills such as how to set the parameters of force controller,where to place the sensor,which material to be chosen and which skills to be used while making jigs were introduced to avoid the just matter. At last,some examples were given to prove the validity of the method proposed.
文摘Laparoscopic surgery is a recent minimally invasive technological innovation that conforms to the idea of endoscopic surgery. With the rapid development of science and technology, gynecological surgery has been widely used laparoscopic technology, greatly improved the gynecological problems. The survey found that China＇s laparoscopic technology and foreign laparoscopic technology were the same leveL Laparoscopic technology has become more and more mature in recent years, laparoscopic technology in the field of gynecology has been applied year after year, after many clinical trials, gets some experience and progress. This article explores the development of laparoscopic surgery in the field of gynecology and the limitations and solutions to discuss, promoting gynecological development, so that the majority of patients benefit from it.
文摘The Dark Matter Particle Explorer(DAMPE) is the first high energy detector satellite in China,whose physics goal is to find evidence of the existence of dark matter particles by investigating the composition and energy spectra of primary cosmic rays,especially those for electrons,positrons and gamma rays,over the dynamic range from 5 Ge V to 10 Te V.DAMPE is a satellite launched by China with the largest payload ratio,where the payload is composed of a BGO(Bismuth Germanate Oxide) Calorimeter,a Plastic Scintillator Detector,a Silicon Tungsten Tracker and a Neutron Detector.This paper introduces the technical scheme of DAMPE,including requirement analysis,composition,technical innovation,on-orbit status and prospect of development for the future.
