英语阅读教学在高中英语教学中占有非常重要的地位,但当前高中英语阅读教学中困难多多,英语阅读互动教学的设计与开发能有助于解决教学困境。本文在分析互动教学软件制作途径的基础上,推介了Adobe Presenter这一适用于高中英语教师开发...英语阅读教学在高中英语教学中占有非常重要的地位,但当前高中英语阅读教学中困难多多,英语阅读互动教学的设计与开发能有助于解决教学困境。本文在分析互动教学软件制作途径的基础上,推介了Adobe Presenter这一适用于高中英语教师开发互动教学内容的教学软件,并结合高中英语第三模块第一单元的"Festivals around the World",具体分析了基于Adobe Presenter的英语阅读互动教学软件的开发。展开更多
Moyamoya disease (MMD) is a condition characterized by the gradual narrowing and blockage of blood vessels in the brain, specifically those in the circle of Willis and the arteries that supply it. This results in redu...Moyamoya disease (MMD) is a condition characterized by the gradual narrowing and blockage of blood vessels in the brain, specifically those in the circle of Willis and the arteries that supply it. This results in reduced blood flow and oxygen to the brain, leading to progressive symptoms and potential complications. The underlying pathophysiological mechanism remains elucidated. However, recent studies have highlighted numerous etiologic factors: abnormal immune complex responses, susceptibility genes, branched-chain amino acids, antibodies, heritable diseases, and acquired diseases, which may be the great potential triggers for the development of moyamoya disease. Its clinical presentation has varying degrees from transient asymptomatic events to significant neurological deficits. Moyamoya disease (MMD) shows different patterns in children and adults. Children with MMD are more susceptible to ischemic events due to decreased blood flow to the brain. Conversely, adults with MMD are more prone to hemorrhagic events involving brain bleeding. Children with MMD may experience a range of symptoms including motor impairments, sensory issues, seizures, headaches, dizziness, cognitive delays, or ongoing neurological problems. Although adults may present with similar clinical symptoms as children, they are more prone to experiencing sudden onset intraventricular, subarachnoid, or intracerebral hemorrhages. One of the challenges in moyamoya disease is the potential for misdiagnosis or delayed diagnosis, particularly when physicians fail to consider MMD as a possible cause in stroke patients. This review aims to provide a comprehensive overview of recent global studies on the pathophysiology of MMD, along with advancements in its management. Additionally, the review will delve into various surgical treatment options for MMD, as well as its rare occurrence alongside atrioventricular malformations. Exciting prospects include the use of autologous bone marrow transplant and the potential role of Connexin 43 protein treatment in the development of moyamoya disease.展开更多
Ever since she was discovered by a modeling agency at the age of 13.Hamburg native Kai-LiMa has appeared in the TV commercials,bllboard ads and fashion shows for some of the world's biggest brands.Eartier this yea...Ever since she was discovered by a modeling agency at the age of 13.Hamburg native Kai-LiMa has appeared in the TV commercials,bllboard ads and fashion shows for some of the world's biggest brands.Eartier this year,the Shanghai based model establishedher own streetwear label Mopsi,which is named after an anti social‘Unipig’that she created.展开更多
Ever since she was discovered by a modeling agency at the age of 13,Hamburg native Kai-Li Ma has appeared in the TV commercials,billboard ads and fashion shows for some of the worlds biggest brands.Earlier this year,t...Ever since she was discovered by a modeling agency at the age of 13,Hamburg native Kai-Li Ma has appeared in the TV commercials,billboard ads and fashion shows for some of the worlds biggest brands.Earlier this year,the Shanghai-based model established her own streetwear label M叩si,which is named after an anti-social^nipig1 that she created.展开更多
This work presents a flexible/unified hardware architecture of Elliptic-curve Cryptography(ECC)and PRESENT for cryptographic applications.The features of the proposed work are(i)computation of only the point multiplic...This work presents a flexible/unified hardware architecture of Elliptic-curve Cryptography(ECC)and PRESENT for cryptographic applications.The features of the proposed work are(i)computation of only the point multiplication operation of ECC over GF(2163)for a 163-bit key generation,(ii)execution of only the variant of an 80-bit PRESENT block cipher for data encryption&decryption and(iii)execution of point multiplication operation(ECC algorithm)along with the data encryption and decryption(PRESENT algorithm).To establish an area overhead for the flexible design,dedicated hardware architectures of ECC and PRESENT are implemented in the first step,and a sum of their hardware area is computed.Then,the implementation of the proposed flexible architecture for ECC and PRESENT algorithms is presented.Implementation results regarding the area,clock cycles,latency,clock frequency,and power after the place-and-route level on Xilinx Virtex-5,Virtex-6,and Virtex-7 FPGA devices are presented.Hence,the implementation results and comparisons show that the proposed architecture suits applications demanding flexible implementation of cryptographic applications.展开更多
Background:Wernicke encephalopathy(WE)is an acute neurological disease resulting from vitamin B1 deficiency,and there are only very few case reports of WE after liver transplantation.The present study aimed to investi...Background:Wernicke encephalopathy(WE)is an acute neurological disease resulting from vitamin B1 deficiency,and there are only very few case reports of WE after liver transplantation.The present study aimed to investigate the clinical characteristics,etiology,magnetic resonance imaging(MRI)features,treatment and prognosis of patients with WE after liver transplantation.Methods:Twenty-three patients with WE after liver transplantation from the First Affiliated Hospital,Zhejiang University School of Medicine and Jiangxi Provincial People’s Hospital between January 2011 and December 2021 were retrospectively analyzed.Results:Among the 23 patients diagnosed with WE after liver transplantation,6(26%)had a classic triad of impaired consciousness,oculomotor palsy and ataxia,and 17(74%)had two features.The misdiagno-sis rate was 65%.After treatment with high-dose vitamin B1,19(83%)patients showed improvement,whereas 4(17%)showed no improvement,including 3 with residual short-term memory impairments and 1 with residual spatial and temporal disorientation and ataxia.Conclusions:The misdiagnosis rate is high in the early stage of WE,and the prognosis is closely asso-ciated with whether WE is diagnosed early and treated timely.High-dose glucose or glucocorticoids can trigger WE and cannot be administered before vitamin B1 treatment.Vitamin B1 is suggested to be used as a prophylactic treatment for patients with WE after liver transplantation.展开更多
In the 21st century,a new round of scientifi c and technological revolution represented by digitalization,networking and intelligence has caused a change in the scientific research paradigm,and the research of complex...In the 21st century,a new round of scientifi c and technological revolution represented by digitalization,networking and intelligence has caused a change in the scientific research paradigm,and the research of complex systems has become the main driving force for the change of the scientific research paradigm.展开更多
BACKGROUND Incidence of cholangiocarcinoma(CCA)is rising,with overall prognosis remaining very poor.Reasons for the high mortality of CCA include its late presentation in most patients,when curative options are no lon...BACKGROUND Incidence of cholangiocarcinoma(CCA)is rising,with overall prognosis remaining very poor.Reasons for the high mortality of CCA include its late presentation in most patients,when curative options are no longer feasible,and poor response to systemic therapies for advanced disease.Late presentation presents a large barrier to improving outcomes and is often associated with diagnosis via mergency presentation(EP).Earlier diagnoses may be made by Two Week Wait(TWW)referrals through General practitioner(GP).We hypothesise that TWW referrals and EP routes to diagnosis differ across regions in England.AIM To investigate routes to diagnosis of CCA over time,regional variation and influencing factors.METHODS We linked patient records from the National Cancer Registration Dataset to Hospital Episode Statistics,Cancer Waiting Times and Cancer Screening Programme datasets to define routes to diagnosis and certain patient characteristics for patients diagnosed 2006-2017 in England.We used linear probability models to investigate geographic variation by assessing the proportions of patients diagnosed via TWW referral or EP across Cancer Alliances in England,adjusting for potential confounders.Correlation between the proportion of people diagnosed by TWW referral and EP was investigated with Spearman’s correlation coefficient.RESULTS Of 23632 patients diagnosed between 2006-2017 in England,the most common route to diagnosis was EP(49.6%).Non-TWW GP referrals accounted for 20.5%of diagnosis routes,13.8%were diagnosed by TWW referral,and the remainder 16.2%were diagnosed via an‘other’or Unknown route.The proportion diagnosed via a TWW referral doubled between 2006-2017 rising from 9.9%to 19.8%,conversely EP diagnosis route declined,falling from 51.3%to 46.0%.Statistically significant variation in both the TWW referral and EP proportions was found across Cancer Alliances.Age,presence of comorbidity and underlying liver disease were independently associated with both a lower proportion of patients diagnosed via TWW referral,and a higher proportion diagnosed by EP after adjusting for other potential confounders.CONCLUSION There is significant geographic and socio-demographic variation in routes to diagnosis of CCA in England.Knowledge sharing of best practice may improve diagnostic pathways and reduce unwarranted variation.展开更多
The Advanced Machining Technology Team of the National Research Council Canada The team,with its focus on the research and development of advanced machining technology,was formed in 2003 within the Aerospace Manufactu...The Advanced Machining Technology Team of the National Research Council Canada The team,with its focus on the research and development of advanced machining technology,was formed in 2003 within the Aerospace Manufacturing Technology Centre,one of the national labs of the National Research Council Canada,which is the largest research&development organization of the Federal Government of Canada.Six research officers all having doctorate degrees lead research work presently in different areas.展开更多
BACKGROUND The late presentation of dural tears(LPDT)has a low incidence rate and hidden symptoms and is easily ignored in clinical practice.If the disease is not treated in time,a series of complications may occur,in...BACKGROUND The late presentation of dural tears(LPDT)has a low incidence rate and hidden symptoms and is easily ignored in clinical practice.If the disease is not treated in time,a series of complications may occur,including low intracranial pressure headache,infection,pseudodural cyst formation,and sinus formation.Here,we describe two cases of LPDT.CASE SUMMARY Two patients had sudden fever 1 wk after lumbar surgery.Physical examination showed obvious tenderness in the operation area.The patients were confirmed as having LPDT by lumbar magnetic resonance imaging and surgical exploration.One case was caused by continuous negative pressure suction and malnutrition,and the other was caused by decreased dural ductility and low postoperative nutritional status.The first symptom of both patients was fever,with occasional headache.Both patients underwent secondary surgery to treat the LPDT.Dural defects were observed and dural sealants were used to seal the dural defects,then drainage tubes were retained for drainage.After the operation,the patients were treated with antibiotics and the patients’surgical incisions healed well,without fever or incision tenderness.Both recovered and were discharged 1 wk after the operation.CONCLUSION LPDT is a rare complication of spinal surgery or neurosurgery that has hidden symptoms and can easily be overlooked.Since it may cause a series of complic-ations,LPDT needs to be actively addressed in clinical practice.展开更多
Yang Xiong,a cultural celebrity in ancient China,is a well-known figure in the history of Chinese literature with abundant research on his literary achievements.However,little research has been done on the presentatio...Yang Xiong,a cultural celebrity in ancient China,is a well-known figure in the history of Chinese literature with abundant research on his literary achievements.However,little research has been done on the presentation of his name,former residence,and prose poems in Chinese calligraphy from an iconographic perspective.This paper intends to explore how“Yang Xiong,”“Yang Ziyun,”“Ziyun Pavilion in Xishu Prefecture,”and“Yang Xiong’s prose poems”are presented in the Chinese calligraphy,especially in calligraphies by Wang Xizhi,Su Dongpo,Huang Tingjian,Mi Fu,and other famous calligraphers in the previous dynasties.Research shows that Yang Xiong influenced not only Chinese literature but also Chinese calligraphy to a certain extent.展开更多
To solve the problem of residual wind power in offshore wind farms,a hydrogen production system with a reasonable capacity was configured to enhance the local load of wind farms and promote the local consumption of re...To solve the problem of residual wind power in offshore wind farms,a hydrogen production system with a reasonable capacity was configured to enhance the local load of wind farms and promote the local consumption of residual wind power.By studying the mathematical model of wind power output and calculating surplus wind power,as well as considering the hydrogen production/storage characteristics of the electrolyzer and hydrogen storage tank,an innovative capacity optimization allocation model was established.The objective of the model was to achieve the lowest total net present value over the entire life cycle.The model took into account the cost-benefit breakdown of equipment end-of-life cost,replacement cost,residual value gain,wind abandonment penalty,hydrogen transportation,and environmental value.The MATLAB-based platform invoked the CPLEX commercial solver to solve the model.Combined with the analysis of the annual average wind speed data from an offshore wind farm in Guangdong Province,the optimal capacity configuration results and the actual operation of the hydrogen production system were obtained.Under the calculation scenario,this hydrogen production system could consume 3,800 MWh of residual electricity from offshore wind power each year.It could achieve complete consumption of residual electricity from wind power without incurring the penalty cost of wind power.Additionally,it could produce 66,500 kg of green hydrogen from wind power,resulting in hydrogen sales revenue of 3.63 million RMB.It would also reduce pollutant emissions from coal-based hydrogen production by 1.5 tons and realize an environmental value of 4.83 million RMB.The annual net operating income exceeded 6 million RMB and the whole life cycle NPV income exceeded 50 million RMB.These results verified the feasibility and rationality of the established capacity optimization allocation model.The model could help advance power system planning and operation research and assist offshore wind farm operators in improving economic and environmental benefits.展开更多
Any non-cephalic presentation in a fetus is regarded as malpresentation.The most common malpresentation,breech,contributes to 3%-5%of term pregnancies and is a leading indication for cesarean delivery.Identification o...Any non-cephalic presentation in a fetus is regarded as malpresentation.The most common malpresentation,breech,contributes to 3%-5%of term pregnancies and is a leading indication for cesarean delivery.Identification of risk factors and a proper physical examination are beneficial;however,ultrasound is the gold standard for the diagnosis of malpresentations.External cephalic version(ECV)refers to a procedure aimed to convert a non-cephalic presenting fetus to cephalic presentation.This procedure is performed manually through the mother’s abdomen by a trained health care provider,to reduce the likelihood of a cesarean section.Studies have reported a version success rate of above 50%by ECV.The main objective of this review is to present a broad perspective on fetal malpresentation,ECV,and delivery of a breech fetus.The focus is to elaborate all clinical scenarios of breech and to provide an evidence-based clinical approach for them.After discussing breech prevalence,risk factors,diagnosis,and management,an updated review of ECV is presented.Moreover,ECV indications/contraindications,alternatives,clinical techniques on how to perform ECV and breech vaginal delivery,and obstetrical considerations for the delivery of malpresentations are thoroughly discussed.展开更多
文摘英语阅读教学在高中英语教学中占有非常重要的地位,但当前高中英语阅读教学中困难多多,英语阅读互动教学的设计与开发能有助于解决教学困境。本文在分析互动教学软件制作途径的基础上,推介了Adobe Presenter这一适用于高中英语教师开发互动教学内容的教学软件,并结合高中英语第三模块第一单元的"Festivals around the World",具体分析了基于Adobe Presenter的英语阅读互动教学软件的开发。
文摘Moyamoya disease (MMD) is a condition characterized by the gradual narrowing and blockage of blood vessels in the brain, specifically those in the circle of Willis and the arteries that supply it. This results in reduced blood flow and oxygen to the brain, leading to progressive symptoms and potential complications. The underlying pathophysiological mechanism remains elucidated. However, recent studies have highlighted numerous etiologic factors: abnormal immune complex responses, susceptibility genes, branched-chain amino acids, antibodies, heritable diseases, and acquired diseases, which may be the great potential triggers for the development of moyamoya disease. Its clinical presentation has varying degrees from transient asymptomatic events to significant neurological deficits. Moyamoya disease (MMD) shows different patterns in children and adults. Children with MMD are more susceptible to ischemic events due to decreased blood flow to the brain. Conversely, adults with MMD are more prone to hemorrhagic events involving brain bleeding. Children with MMD may experience a range of symptoms including motor impairments, sensory issues, seizures, headaches, dizziness, cognitive delays, or ongoing neurological problems. Although adults may present with similar clinical symptoms as children, they are more prone to experiencing sudden onset intraventricular, subarachnoid, or intracerebral hemorrhages. One of the challenges in moyamoya disease is the potential for misdiagnosis or delayed diagnosis, particularly when physicians fail to consider MMD as a possible cause in stroke patients. This review aims to provide a comprehensive overview of recent global studies on the pathophysiology of MMD, along with advancements in its management. Additionally, the review will delve into various surgical treatment options for MMD, as well as its rare occurrence alongside atrioventricular malformations. Exciting prospects include the use of autologous bone marrow transplant and the potential role of Connexin 43 protein treatment in the development of moyamoya disease.
文摘Ever since she was discovered by a modeling agency at the age of 13.Hamburg native Kai-LiMa has appeared in the TV commercials,bllboard ads and fashion shows for some of the world's biggest brands.Eartier this year,the Shanghai based model establishedher own streetwear label Mopsi,which is named after an anti social‘Unipig’that she created.
文摘Ever since she was discovered by a modeling agency at the age of 13,Hamburg native Kai-Li Ma has appeared in the TV commercials,billboard ads and fashion shows for some of the worlds biggest brands.Earlier this year,the Shanghai-based model established her own streetwear label M叩si,which is named after an anti-social^nipig1 that she created.
基金The authors would like to thank the Deanship of Scientific Research at Umm Al-Qura University for supporting this work by Grant Code:(22UQU4320020DSR01).
文摘This work presents a flexible/unified hardware architecture of Elliptic-curve Cryptography(ECC)and PRESENT for cryptographic applications.The features of the proposed work are(i)computation of only the point multiplication operation of ECC over GF(2163)for a 163-bit key generation,(ii)execution of only the variant of an 80-bit PRESENT block cipher for data encryption&decryption and(iii)execution of point multiplication operation(ECC algorithm)along with the data encryption and decryption(PRESENT algorithm).To establish an area overhead for the flexible design,dedicated hardware architectures of ECC and PRESENT are implemented in the first step,and a sum of their hardware area is computed.Then,the implementation of the proposed flexible architecture for ECC and PRESENT algorithms is presented.Implementation results regarding the area,clock cycles,latency,clock frequency,and power after the place-and-route level on Xilinx Virtex-5,Virtex-6,and Virtex-7 FPGA devices are presented.Hence,the implementation results and comparisons show that the proposed architecture suits applications demanding flexible implementation of cryptographic applications.
基金approved by Jiangxi Provincial People’s Hospital and First Affiliated Hospital,Zhejiang University School of Medicine(2022068 and 2022370).Written informed consent was obtained from all participants.
文摘Background:Wernicke encephalopathy(WE)is an acute neurological disease resulting from vitamin B1 deficiency,and there are only very few case reports of WE after liver transplantation.The present study aimed to investigate the clinical characteristics,etiology,magnetic resonance imaging(MRI)features,treatment and prognosis of patients with WE after liver transplantation.Methods:Twenty-three patients with WE after liver transplantation from the First Affiliated Hospital,Zhejiang University School of Medicine and Jiangxi Provincial People’s Hospital between January 2011 and December 2021 were retrospectively analyzed.Results:Among the 23 patients diagnosed with WE after liver transplantation,6(26%)had a classic triad of impaired consciousness,oculomotor palsy and ataxia,and 17(74%)had two features.The misdiagno-sis rate was 65%.After treatment with high-dose vitamin B1,19(83%)patients showed improvement,whereas 4(17%)showed no improvement,including 3 with residual short-term memory impairments and 1 with residual spatial and temporal disorientation and ataxia.Conclusions:The misdiagnosis rate is high in the early stage of WE,and the prognosis is closely asso-ciated with whether WE is diagnosed early and treated timely.High-dose glucose or glucocorticoids can trigger WE and cannot be administered before vitamin B1 treatment.Vitamin B1 is suggested to be used as a prophylactic treatment for patients with WE after liver transplantation.
文摘In the 21st century,a new round of scientifi c and technological revolution represented by digitalization,networking and intelligence has caused a change in the scientific research paradigm,and the research of complex systems has become the main driving force for the change of the scientific research paradigm.
文摘BACKGROUND Incidence of cholangiocarcinoma(CCA)is rising,with overall prognosis remaining very poor.Reasons for the high mortality of CCA include its late presentation in most patients,when curative options are no longer feasible,and poor response to systemic therapies for advanced disease.Late presentation presents a large barrier to improving outcomes and is often associated with diagnosis via mergency presentation(EP).Earlier diagnoses may be made by Two Week Wait(TWW)referrals through General practitioner(GP).We hypothesise that TWW referrals and EP routes to diagnosis differ across regions in England.AIM To investigate routes to diagnosis of CCA over time,regional variation and influencing factors.METHODS We linked patient records from the National Cancer Registration Dataset to Hospital Episode Statistics,Cancer Waiting Times and Cancer Screening Programme datasets to define routes to diagnosis and certain patient characteristics for patients diagnosed 2006-2017 in England.We used linear probability models to investigate geographic variation by assessing the proportions of patients diagnosed via TWW referral or EP across Cancer Alliances in England,adjusting for potential confounders.Correlation between the proportion of people diagnosed by TWW referral and EP was investigated with Spearman’s correlation coefficient.RESULTS Of 23632 patients diagnosed between 2006-2017 in England,the most common route to diagnosis was EP(49.6%).Non-TWW GP referrals accounted for 20.5%of diagnosis routes,13.8%were diagnosed by TWW referral,and the remainder 16.2%were diagnosed via an‘other’or Unknown route.The proportion diagnosed via a TWW referral doubled between 2006-2017 rising from 9.9%to 19.8%,conversely EP diagnosis route declined,falling from 51.3%to 46.0%.Statistically significant variation in both the TWW referral and EP proportions was found across Cancer Alliances.Age,presence of comorbidity and underlying liver disease were independently associated with both a lower proportion of patients diagnosed via TWW referral,and a higher proportion diagnosed by EP after adjusting for other potential confounders.CONCLUSION There is significant geographic and socio-demographic variation in routes to diagnosis of CCA in England.Knowledge sharing of best practice may improve diagnostic pathways and reduce unwarranted variation.
文摘The Advanced Machining Technology Team of the National Research Council Canada The team,with its focus on the research and development of advanced machining technology,was formed in 2003 within the Aerospace Manufacturing Technology Centre,one of the national labs of the National Research Council Canada,which is the largest research&development organization of the Federal Government of Canada.Six research officers all having doctorate degrees lead research work presently in different areas.
基金Supported by Jilin Health Science and Technology Capability Improvement Project,No.2022C107.
文摘BACKGROUND The late presentation of dural tears(LPDT)has a low incidence rate and hidden symptoms and is easily ignored in clinical practice.If the disease is not treated in time,a series of complications may occur,including low intracranial pressure headache,infection,pseudodural cyst formation,and sinus formation.Here,we describe two cases of LPDT.CASE SUMMARY Two patients had sudden fever 1 wk after lumbar surgery.Physical examination showed obvious tenderness in the operation area.The patients were confirmed as having LPDT by lumbar magnetic resonance imaging and surgical exploration.One case was caused by continuous negative pressure suction and malnutrition,and the other was caused by decreased dural ductility and low postoperative nutritional status.The first symptom of both patients was fever,with occasional headache.Both patients underwent secondary surgery to treat the LPDT.Dural defects were observed and dural sealants were used to seal the dural defects,then drainage tubes were retained for drainage.After the operation,the patients were treated with antibiotics and the patients’surgical incisions healed well,without fever or incision tenderness.Both recovered and were discharged 1 wk after the operation.CONCLUSION LPDT is a rare complication of spinal surgery or neurosurgery that has hidden symptoms and can easily be overlooked.Since it may cause a series of complic-ations,LPDT needs to be actively addressed in clinical practice.
文摘Yang Xiong,a cultural celebrity in ancient China,is a well-known figure in the history of Chinese literature with abundant research on his literary achievements.However,little research has been done on the presentation of his name,former residence,and prose poems in Chinese calligraphy from an iconographic perspective.This paper intends to explore how“Yang Xiong,”“Yang Ziyun,”“Ziyun Pavilion in Xishu Prefecture,”and“Yang Xiong’s prose poems”are presented in the Chinese calligraphy,especially in calligraphies by Wang Xizhi,Su Dongpo,Huang Tingjian,Mi Fu,and other famous calligraphers in the previous dynasties.Research shows that Yang Xiong influenced not only Chinese literature but also Chinese calligraphy to a certain extent.
基金supported by Manage Innovation Project of China Southern Power Grid Co.,Ltd.(No.GZHKJXM20210232).
文摘To solve the problem of residual wind power in offshore wind farms,a hydrogen production system with a reasonable capacity was configured to enhance the local load of wind farms and promote the local consumption of residual wind power.By studying the mathematical model of wind power output and calculating surplus wind power,as well as considering the hydrogen production/storage characteristics of the electrolyzer and hydrogen storage tank,an innovative capacity optimization allocation model was established.The objective of the model was to achieve the lowest total net present value over the entire life cycle.The model took into account the cost-benefit breakdown of equipment end-of-life cost,replacement cost,residual value gain,wind abandonment penalty,hydrogen transportation,and environmental value.The MATLAB-based platform invoked the CPLEX commercial solver to solve the model.Combined with the analysis of the annual average wind speed data from an offshore wind farm in Guangdong Province,the optimal capacity configuration results and the actual operation of the hydrogen production system were obtained.Under the calculation scenario,this hydrogen production system could consume 3,800 MWh of residual electricity from offshore wind power each year.It could achieve complete consumption of residual electricity from wind power without incurring the penalty cost of wind power.Additionally,it could produce 66,500 kg of green hydrogen from wind power,resulting in hydrogen sales revenue of 3.63 million RMB.It would also reduce pollutant emissions from coal-based hydrogen production by 1.5 tons and realize an environmental value of 4.83 million RMB.The annual net operating income exceeded 6 million RMB and the whole life cycle NPV income exceeded 50 million RMB.These results verified the feasibility and rationality of the established capacity optimization allocation model.The model could help advance power system planning and operation research and assist offshore wind farm operators in improving economic and environmental benefits.
文摘Any non-cephalic presentation in a fetus is regarded as malpresentation.The most common malpresentation,breech,contributes to 3%-5%of term pregnancies and is a leading indication for cesarean delivery.Identification of risk factors and a proper physical examination are beneficial;however,ultrasound is the gold standard for the diagnosis of malpresentations.External cephalic version(ECV)refers to a procedure aimed to convert a non-cephalic presenting fetus to cephalic presentation.This procedure is performed manually through the mother’s abdomen by a trained health care provider,to reduce the likelihood of a cesarean section.Studies have reported a version success rate of above 50%by ECV.The main objective of this review is to present a broad perspective on fetal malpresentation,ECV,and delivery of a breech fetus.The focus is to elaborate all clinical scenarios of breech and to provide an evidence-based clinical approach for them.After discussing breech prevalence,risk factors,diagnosis,and management,an updated review of ECV is presented.Moreover,ECV indications/contraindications,alternatives,clinical techniques on how to perform ECV and breech vaginal delivery,and obstetrical considerations for the delivery of malpresentations are thoroughly discussed.