Different forest stands in the Dongjiang Lake Reservoir area of Zixing were selected as the research objects to study the characteristics of runoff generation in different forest stands.The results showed that there w...Different forest stands in the Dongjiang Lake Reservoir area of Zixing were selected as the research objects to study the characteristics of runoff generation in different forest stands.The results showed that there was no significant difference in annual runoff among M3,M1,and M5,and no significant difference between each forest stand and the control.The order was M3(22.75 mm)>M1(21.77 mm)>M5(20.14 mm).Forest vegetation generates less runoff through vegetation restoration compared to the control,indicating that forest vegetation reconstruction and restoration are beneficial for soil and water conservation.展开更多
The outbreak of corona virus disease 2019(COVID-19)imposes a major challenge in managing patients undergoing surgical operation.In this study,we analyzed clinical and transmission features of 25 cases of COVID-19 from...The outbreak of corona virus disease 2019(COVID-19)imposes a major challenge in managing patients undergoing surgical operation.In this study,we analyzed clinical and transmission features of 25 cases of COVID-19 from a single thoracic department,including 13 patients and 12 health care staff.There were 13 males and 12 females.The median age of the patients was 61(range:51 to 69)years.The median age of the health care staff was 35(range:22 to 51)years.By the end of follow-up date(Mar.3,2020),there were 16 non-severe cases(64%)and 9 severe cases(36%),5 cases were dead(20%).Nineteen(76%)of the infected cases were confirmed by SARS-CoV-2 nucleic acid test,the rest were clinically diagnosed as suspected COVID-19 cases,and 19(76%)of the infected cases had positive exposure history.We found that COPD was significantly associated with severity and death(P-0.040,and P=0.038,respectively),and chest operation was significantly associated with death for COVID-19 patients(P-0.039).A potential“super spreader"may be the source of the transmission before the implementation of quarantine and comprehensive protcction.It was concluded that COVID-19 is associated with poor prognosis for patients undergoing thoracic operation,especially for those with COPD.Implementation of comprehensive protective measures is important to control nosocomial infection.展开更多
We aimed to describe a method for repositioning of right middle lobar torsion by using a 3-cm uniportal video-assisted thoracoscopic surgery(VATS) approach. Middle lobe torsion occurred after right upper and lower lob...We aimed to describe a method for repositioning of right middle lobar torsion by using a 3-cm uniportal video-assisted thoracoscopic surgery(VATS) approach. Middle lobe torsion occurred after right upper and lower lobectomy in a 74-year-old man. Immediate re-exploratory thoracotomy using the 3-cm uniportal VATS approach was performed. The torsion was corrected, and the lobe was anchored to the anterior chest wall with Prolene stitches. The patient recovered well postoperatively with daily improvements in chest radiographic findings. Follow-up examination was performed using fiberbronchoscopy, which revealed an unobstructed right middle lobe bronchus and sticky yellow sputum. Follow-up chest computed tomography was performed 3 months after the primary surgery and revealed increased expansion of the right middle lobe. We repositioned the right middle lobe successfully by using the 3-cm uniportal VATS approach, but more cases are needed to confirm the feasibility of the approach. Lobectomy remains the primary treatment option for such cases.展开更多
The isomerization of hydrofluorocyclopentenes promoted by fluoride anion was investigated. It was found that two processes were responsible for interconversion of the isomers: an allylic syn-addition/elimination of fl...The isomerization of hydrofluorocyclopentenes promoted by fluoride anion was investigated. It was found that two processes were responsible for interconversion of the isomers: an allylic syn-addition/elimination of fluoride anion that does not change the mutual positions of hydrogen atoms but is responsible for transfers of fluorine atoms, and a fluoride anion-assisted deprotonation/protonation which does not change the mutual positions of fluorine atoms but is responsible for transfers of hydrogen atoms. In the deprotonation, HF can easily capture excess fluoride anion to form HF2- anion which can probably inhibit the protonation.展开更多
We are describing a novel technique to insert nasogastric tube (NGT) in the anesthetized patients dur- ing cervical esophageal reconstruction. Methods: Forty patients with mid and upper esophageal tumor enrolled in...We are describing a novel technique to insert nasogastric tube (NGT) in the anesthetized patients dur- ing cervical esophageal reconstruction. Methods: Forty patients with mid and upper esophageal tumor enrolled into this study were randomly allocated into two groups (the control group, group C and the novel method group, group N). All the patients were applied mechanical anastomosis to finish the cervical esophageal reconstruction. The procedure of NGT insertion for group C use the conventional method; well, the group N use the novel technique. Results: All the patients in group N had been finished the NGT insertion in the first attempt, and the total time for insertion was (5.05 + 1.15) mins; on the contrary, for the group C, duration of insertion (min) was (24.45 ± 5.23) mins, and the successful rate of NGT insertion in the first attempt was 40% (P〈 0.05); no one in group N had coiling/kinking, and 6/20 (30%) in group C had it (P= 0.020). The complication rate of bleeding between the two group had no significant difference. Conclusion: For the patient with mid and upper esophageal tumor who need cervical esophageal reconstruction, this novel method can save the NGT insertion time, and make it easier with higher successful rate.展开更多
The study of unit commitment (UC) aims to find reasonable schedules for generators to optimize power systems’ operation. Many papers have been published that solve UC through different methods. Articles that systemat...The study of unit commitment (UC) aims to find reasonable schedules for generators to optimize power systems’ operation. Many papers have been published that solve UC through different methods. Articles that systematically summarize UC problems’ progress in order to update researchers interested in this field are needed. Because of its promising performance, stochastic programming (SP) has become increasingly researched. Most papers, however, present SP’s UC solving approaches differently, which masks their relationships and makes it hard for new researchers to quickly obtain a general idea. Therefore, this paper tries to give a structured bibliographic survey of SP’s applications in UC problems.展开更多
The effect of Al content(0.035 wt%,0.5 wt%,1 wt%,and 2 wt%)on the composition change of steel and slag as well as inclusion transformation of high manganese steel after it has equilibrated with Ca O-Si O_(2)-Al_(2)O_(...The effect of Al content(0.035 wt%,0.5 wt%,1 wt%,and 2 wt%)on the composition change of steel and slag as well as inclusion transformation of high manganese steel after it has equilibrated with Ca O-Si O_(2)-Al_(2)O_(3)-Mg O slag was studied using the method of slag/steel reaction.The experimental results showed that as the initial content of Al increased from 0.035 wt%to 2 wt%,Al gradually replaced Mn to react with Si O_(2)in slag to avoid the loss of Mn due to the reaction;this process caused both Al_(2)O_(3)in slag and Si in steel to increase while Si O_(2)and Mn O in slag to reduce.In addition,the type of inclusions also evolved as the initial Al content increased.The evolution route of inclusions was Mn O→Mn O-Al_(2)O_(3)-Mg O→Mg O→Mn O-Ca O-Al_(2)O_(3)-Mg O and Mn O-Ca O-Mg O.The shape of inclusions evolved from spherical to irregular,became faceted,and finally transformed to spherical.The average size of inclusions presented a trend that was increasing first and then decreasing.The transformation mechanism of inclusions was explored.As the initial content of Al increased,Mg and Ca were reduced from top slag into molten steel in sequence,which consequently caused the transformation of inclusions.展开更多
In this paper,the type,vertical evolution,and distribution pattern of sedimentary facies of the Paleogene Dainan Formation in the Gaoyou Depression of the North Jiangsu Basin are studied in detail.Results show that fa...In this paper,the type,vertical evolution,and distribution pattern of sedimentary facies of the Paleogene Dainan Formation in the Gaoyou Depression of the North Jiangsu Basin are studied in detail.Results show that fan delta,delta,nearshore subaqueous fan,and lacustrine facies developed during the Dainan Formation period and their distribution pattern was mainly controlled by tectonics and paleogeography.The fan delta and nearshore subaqueous fan facies predominantly occur in the southern steep slope region where fault-induced subsidence is thought to have created substantial accommodation,whereas the delta facies are distributed on the northern gentle slope which is thought to have experienced less subsidence.Finally,the lacustrine facies is shown to have developed in the center of the depression,as well as on the flanks of the fan delta,delta,and nearshore subaqueous fan facies.Vertically,the Dainan Formation represents an integrated transgressiveregressive cycle,with the E2d1being the transgressive sequence and the E2d2being the regressive sequence.This distribution model of sedimentary facies plays an important role in predicting favorable reservoir belts for the Dainan Formation in the Gaoyou Depression and similar areas.In the Gaoyou Depression,sandstones of the subaqueous distributary channels in the fan delta and the subaqueous branch channels in the delta are characterized by physical properties favorable for reservoir formation.展开更多
We investigate the dynamical behavior of hybrid virus infection systems with nonlytic immune response in switching environment, which is modeled as a stochastic process of telegraph noise and represented as a multi-st...We investigate the dynamical behavior of hybrid virus infection systems with nonlytic immune response in switching environment, which is modeled as a stochastic process of telegraph noise and represented as a multi-state Markov chains. Firstly, The existence of unique positive solution and boundedness of the new hybrid system is proved. Furthermore, the sufficient conditions for extinction and persistence of virus are established. Finally, stochastic simulations are performed to test and demonstrate the conclusions. As a consequence, our work suggests that stochastic switching environment plays a crucial role in the process of virus prevention and treatment.展开更多
Environment is facing lots of problems mainly caused by plastic bags.Plastic bags have very harmful effect on environment as they don't dispose of.Recycling is a process in which the waste material can be reused a...Environment is facing lots of problems mainly caused by plastic bags.Plastic bags have very harmful effect on environment as they don't dispose of.Recycling is a process in which the waste material can be reused and re-created to give it a new look which also saves money and make environment eco-friendly.This study focuses on conveying eco-friendly fashion concept to the consumers.Inspired by plastic bags'shape and patterns,the author creates a new method of pattern making for female clothing which decorated on different materials.Through design practices and draping experiments,a new ready-to-wear collection shows the more possibility of eco-friendly idea in fashion industry.展开更多
From January 2013 to January 2015, 19 patients of traumatic hemothorax with hemorrhagic shock were treated in our department by thoracoscopic surgery combined with autologous blood transfusion. This study retrospectiv...From January 2013 to January 2015, 19 patients of traumatic hemothorax with hemorrhagic shock were treated in our department by thoracoscopic surgery combined with autologous blood transfusion. This study retrospectively analyzed the therapeutic effect and shared our experience. The average amount of blood transfused back was 662.41 ml ± 269.15 ml. None of the patients developed transfusion reaction and were all discharged uneventfully. Thoracoscopic surgery combined with autologous blood transfusion is effective in the rescue of patients with progressive hemothorax and hemorrhagic shock. When corresponding indications are well managed, treatment for these patients is quicker, safer, and more effective.展开更多
基金Supported by Hunan Province Science and Technology Plan Project(2019SK2336,2019sfq21,2021SFQ19)Hunan Forestry Science and Technology Plan Project(OT-S-KTA5,2024YBC15).
文摘Different forest stands in the Dongjiang Lake Reservoir area of Zixing were selected as the research objects to study the characteristics of runoff generation in different forest stands.The results showed that there was no significant difference in annual runoff among M3,M1,and M5,and no significant difference between each forest stand and the control.The order was M3(22.75 mm)>M1(21.77 mm)>M5(20.14 mm).Forest vegetation generates less runoff through vegetation restoration compared to the control,indicating that forest vegetation reconstruction and restoration are beneficial for soil and water conservation.
文摘The outbreak of corona virus disease 2019(COVID-19)imposes a major challenge in managing patients undergoing surgical operation.In this study,we analyzed clinical and transmission features of 25 cases of COVID-19 from a single thoracic department,including 13 patients and 12 health care staff.There were 13 males and 12 females.The median age of the patients was 61(range:51 to 69)years.The median age of the health care staff was 35(range:22 to 51)years.By the end of follow-up date(Mar.3,2020),there were 16 non-severe cases(64%)and 9 severe cases(36%),5 cases were dead(20%).Nineteen(76%)of the infected cases were confirmed by SARS-CoV-2 nucleic acid test,the rest were clinically diagnosed as suspected COVID-19 cases,and 19(76%)of the infected cases had positive exposure history.We found that COPD was significantly associated with severity and death(P-0.040,and P=0.038,respectively),and chest operation was significantly associated with death for COVID-19 patients(P-0.039).A potential“super spreader"may be the source of the transmission before the implementation of quarantine and comprehensive protcction.It was concluded that COVID-19 is associated with poor prognosis for patients undergoing thoracic operation,especially for those with COPD.Implementation of comprehensive protective measures is important to control nosocomial infection.
文摘We aimed to describe a method for repositioning of right middle lobar torsion by using a 3-cm uniportal video-assisted thoracoscopic surgery(VATS) approach. Middle lobe torsion occurred after right upper and lower lobectomy in a 74-year-old man. Immediate re-exploratory thoracotomy using the 3-cm uniportal VATS approach was performed. The torsion was corrected, and the lobe was anchored to the anterior chest wall with Prolene stitches. The patient recovered well postoperatively with daily improvements in chest radiographic findings. Follow-up examination was performed using fiberbronchoscopy, which revealed an unobstructed right middle lobe bronchus and sticky yellow sputum. Follow-up chest computed tomography was performed 3 months after the primary surgery and revealed increased expansion of the right middle lobe. We repositioned the right middle lobe successfully by using the 3-cm uniportal VATS approach, but more cases are needed to confirm the feasibility of the approach. Lobectomy remains the primary treatment option for such cases.
文摘The isomerization of hydrofluorocyclopentenes promoted by fluoride anion was investigated. It was found that two processes were responsible for interconversion of the isomers: an allylic syn-addition/elimination of fluoride anion that does not change the mutual positions of hydrogen atoms but is responsible for transfers of fluorine atoms, and a fluoride anion-assisted deprotonation/protonation which does not change the mutual positions of fluorine atoms but is responsible for transfers of hydrogen atoms. In the deprotonation, HF can easily capture excess fluoride anion to form HF2- anion which can probably inhibit the protonation.
文摘We are describing a novel technique to insert nasogastric tube (NGT) in the anesthetized patients dur- ing cervical esophageal reconstruction. Methods: Forty patients with mid and upper esophageal tumor enrolled into this study were randomly allocated into two groups (the control group, group C and the novel method group, group N). All the patients were applied mechanical anastomosis to finish the cervical esophageal reconstruction. The procedure of NGT insertion for group C use the conventional method; well, the group N use the novel technique. Results: All the patients in group N had been finished the NGT insertion in the first attempt, and the total time for insertion was (5.05 + 1.15) mins; on the contrary, for the group C, duration of insertion (min) was (24.45 ± 5.23) mins, and the successful rate of NGT insertion in the first attempt was 40% (P〈 0.05); no one in group N had coiling/kinking, and 6/20 (30%) in group C had it (P= 0.020). The complication rate of bleeding between the two group had no significant difference. Conclusion: For the patient with mid and upper esophageal tumor who need cervical esophageal reconstruction, this novel method can save the NGT insertion time, and make it easier with higher successful rate.
文摘The study of unit commitment (UC) aims to find reasonable schedules for generators to optimize power systems’ operation. Many papers have been published that solve UC through different methods. Articles that systematically summarize UC problems’ progress in order to update researchers interested in this field are needed. Because of its promising performance, stochastic programming (SP) has become increasingly researched. Most papers, however, present SP’s UC solving approaches differently, which masks their relationships and makes it hard for new researchers to quickly obtain a general idea. Therefore, this paper tries to give a structured bibliographic survey of SP’s applications in UC problems.
基金financially supported by the Ministry of Industry and Information Technology of China(No.TC180A6MR)China Scholarship Council and the National Natural Science Foundation of China(No.51404020)。
文摘The effect of Al content(0.035 wt%,0.5 wt%,1 wt%,and 2 wt%)on the composition change of steel and slag as well as inclusion transformation of high manganese steel after it has equilibrated with Ca O-Si O_(2)-Al_(2)O_(3)-Mg O slag was studied using the method of slag/steel reaction.The experimental results showed that as the initial content of Al increased from 0.035 wt%to 2 wt%,Al gradually replaced Mn to react with Si O_(2)in slag to avoid the loss of Mn due to the reaction;this process caused both Al_(2)O_(3)in slag and Si in steel to increase while Si O_(2)and Mn O in slag to reduce.In addition,the type of inclusions also evolved as the initial Al content increased.The evolution route of inclusions was Mn O→Mn O-Al_(2)O_(3)-Mg O→Mg O→Mn O-Ca O-Al_(2)O_(3)-Mg O and Mn O-Ca O-Mg O.The shape of inclusions evolved from spherical to irregular,became faceted,and finally transformed to spherical.The average size of inclusions presented a trend that was increasing first and then decreasing.The transformation mechanism of inclusions was explored.As the initial content of Al increased,Mg and Ca were reduced from top slag into molten steel in sequence,which consequently caused the transformation of inclusions.
基金financially supported by the National Natural Science Foundation of China (Grants Nos. 41272124 and 41402092)Natural Science Foundation (Youth Science Fund Project) of Jiangsu Province (BK20140604)+1 种基金the Fundamental Research Funds for the Central Universities (20620140386)the State Key Laboratory for Mineral Deposits Research of Nanjing University (Grant No. ZZKT-201321)
文摘In this paper,the type,vertical evolution,and distribution pattern of sedimentary facies of the Paleogene Dainan Formation in the Gaoyou Depression of the North Jiangsu Basin are studied in detail.Results show that fan delta,delta,nearshore subaqueous fan,and lacustrine facies developed during the Dainan Formation period and their distribution pattern was mainly controlled by tectonics and paleogeography.The fan delta and nearshore subaqueous fan facies predominantly occur in the southern steep slope region where fault-induced subsidence is thought to have created substantial accommodation,whereas the delta facies are distributed on the northern gentle slope which is thought to have experienced less subsidence.Finally,the lacustrine facies is shown to have developed in the center of the depression,as well as on the flanks of the fan delta,delta,and nearshore subaqueous fan facies.Vertically,the Dainan Formation represents an integrated transgressiveregressive cycle,with the E2d1being the transgressive sequence and the E2d2being the regressive sequence.This distribution model of sedimentary facies plays an important role in predicting favorable reservoir belts for the Dainan Formation in the Gaoyou Depression and similar areas.In the Gaoyou Depression,sandstones of the subaqueous distributary channels in the fan delta and the subaqueous branch channels in the delta are characterized by physical properties favorable for reservoir formation.
基金Project supported by the National Natural Science Foundation of China(Grant No.11571009)the Applied Basic Research Programs of Shanxi Province of China(Grant No.201901D111086).
文摘We investigate the dynamical behavior of hybrid virus infection systems with nonlytic immune response in switching environment, which is modeled as a stochastic process of telegraph noise and represented as a multi-state Markov chains. Firstly, The existence of unique positive solution and boundedness of the new hybrid system is proved. Furthermore, the sufficient conditions for extinction and persistence of virus are established. Finally, stochastic simulations are performed to test and demonstrate the conclusions. As a consequence, our work suggests that stochastic switching environment plays a crucial role in the process of virus prevention and treatment.
文摘Environment is facing lots of problems mainly caused by plastic bags.Plastic bags have very harmful effect on environment as they don't dispose of.Recycling is a process in which the waste material can be reused and re-created to give it a new look which also saves money and make environment eco-friendly.This study focuses on conveying eco-friendly fashion concept to the consumers.Inspired by plastic bags'shape and patterns,the author creates a new method of pattern making for female clothing which decorated on different materials.Through design practices and draping experiments,a new ready-to-wear collection shows the more possibility of eco-friendly idea in fashion industry.
文摘From January 2013 to January 2015, 19 patients of traumatic hemothorax with hemorrhagic shock were treated in our department by thoracoscopic surgery combined with autologous blood transfusion. This study retrospectively analyzed the therapeutic effect and shared our experience. The average amount of blood transfused back was 662.41 ml ± 269.15 ml. None of the patients developed transfusion reaction and were all discharged uneventfully. Thoracoscopic surgery combined with autologous blood transfusion is effective in the rescue of patients with progressive hemothorax and hemorrhagic shock. When corresponding indications are well managed, treatment for these patients is quicker, safer, and more effective.