Temperature is a critical factor influencing the performance of coal catalytic hydrogasification in bubbling fluidized bed gasifiers.Numerical simulations at various temperatures(1023 K,1073 K,1123 K,and 1173 K)are co...Temperature is a critical factor influencing the performance of coal catalytic hydrogasification in bubbling fluidized bed gasifiers.Numerical simulations at various temperatures(1023 K,1073 K,1123 K,and 1173 K)are conducted to elucidate the mechanisms by which temperature affects bubble size,global reaction performance,and particle-scale reactivity.The simulation results indicate that bubble size increases at elevated temperatures,while H_(2)-char hydrogasification reactivity is enhanced.Particle trajectory analyses reveal that particles sized between 100 and 250μm undergo intense char hydrogasification in the dense phase,contributing to the formation of hot spots.To assess the impact of temperature on the particle-scale flow-transfer-reaction process,the dimensionless quantities of Reynolds,Nusselt,and Sherwood numbers,along with the solids dispersion coefficient,are calculated.It is found that higher temperatures inhibit bubble-induced mass and heat transfer.In general,3 MPa,1123 K,and 3-4 fluidization numbers are identified as the optimal conditions for particles ranging from 0 to350μm.These findings provide valuable insights into the inherent interactions between temperature and gas-particle reaction.展开更多
BACKGROUND Indolent NK-cell lymphoproliferative disorder of the gastrointestinal tract(iNKLPD)is a rare and recently defined entity,recognized in the 2022 WHO classification of hematolymphoid tumors.iNKLPD typically e...BACKGROUND Indolent NK-cell lymphoproliferative disorder of the gastrointestinal tract(iNKLPD)is a rare and recently defined entity,recognized in the 2022 WHO classification of hematolymphoid tumors.iNKLPD typically exhibits a benign or slowly progressive clinical course,with disease localized to the gastrointestinal tract.Here,we present what we believe to be the first reported case of iNKLPD associated with protein-losing enteropathy(PLE),characterized by a poor response to chemotherapy and rapid clinical deterioration,culminating in death within a few months.CASE SUMMARY We report the case of a 64-year-old man who presented with bilateral lower-extremity edema and fatigue.Laboratory tests revealed marked hypoalbuminemia,while other liver function parameters remained within normal limits.Renal and cardiac function assessments were unremarkable.Histopathological examination of endoscopic biopsies confirmed a diagnosis of iNKLPD of the gastrointestinal tract.The patient was treated with oral prednisone and cyclosporine,which led to temporary improvement in both symptoms and serum albumin levels.However,disease relapse occurred during corticosteroid tapering,accompanied by worsening hypoalbu-minemia and refractory diarrhea.The patient died eight months after diagnosis,likely due to disease progression or severe treatment-related complications.CONCLUSION iNKLPD generally exhibits an indolent course;nonetheless,the prognosis may be poor if secondary PLE is involved.展开更多
Coal catalytic hydrogasification(CCHG)is a straightforward approach for producing CH_(4),which shows advantages over the mature coal-to-CH_(4) technologies from the perspectives of CH_(4) yield,thermal efficiency,and ...Coal catalytic hydrogasification(CCHG)is a straightforward approach for producing CH_(4),which shows advantages over the mature coal-to-CH_(4) technologies from the perspectives of CH_(4) yield,thermal efficiency,and CO_(2) emission.The core of CCHG is to make carbon in coal convert into CH_(4) efficiently with a catalyst.In the past decades,intensive research has been devoted to catalytic hydrogasification of model carbon(pitch coke,activated carbon,coal char).However,the chemical process of CCHG is still not well understood because the coal structure is more complicated,and CCHG is a combination of coal catalytic hydropyrolysis and coal char catalytic hydrogasification.This review seeks to shed light on the catalytic process of raw coal during CCHG.The configuration of suitable catalysts,operating conditions,and feedstocks for tailoring CH_(4) formation were identified,and the underlying mechanisms were elucidated.Based on these results,the CCHG process was evaluated,emphasizing pollutant emissions,energy efficiency,and reactor design.Furthermore,the opportunities and strategic approaches for CCHG under the restraint of carbon neutrality were highlighted by considering the penetration of“green”H2,biomass,and CO_(2) into CCHG.Preliminary investigations from our laboratories demonstrated that the integrated CCHG and biomass/CO_(2) hydrogenation process could perform as an emerging pathway for boosting CH_(4) production by consuming fewer fossil fuels,fulfilling the context of green manufacturing.This work not only provides systematic knowledge of CCHG but also helps to guide the efficient hydrogenation of other carbonaceous resources such as biomass,CO_(2),and coal-derived wastes.展开更多
Objectives The in-hosptial palliative care consultation(PCC) is emerging as a routine service in some medical center in China. The current study evaluated how physicians in primary care team and consultation team perc...Objectives The in-hosptial palliative care consultation(PCC) is emerging as a routine service in some medical center in China. The current study evaluated how physicians in primary care team and consultation team perceive the PCC service for the purpose of investigating the effectiveness of this consultation model in a general hospital.Methods In-hosptial palliative care consultations have been carried out at Peking Union Medical College Hosptial by a dedicated consultation team, and 37 consultations were completed in 2016. A questionnaire was designed for physicians in terms of its benefits to patients,their family as well as the primary care team. Physicians who applied for consultation in 2016 formally(requested from the department other than the Geriatrics) and informally(by rotating residents and unemployed visiting doctors in geriatric department) were invited to participate in the survey by scanning a two dimentional code on social networking platform.Results There were 103 physicians participated in the survey, including primary care physicians from the department of Internal Medicine(n=8), Gynaecology(n=16) and Surgery(n=13), rotating residents(n=30), visiting doctors(n=16) in Geriatric department, and PCC team members(n=20). 94.0% of the non-PCC physicians agreed that PCC relieved the suffering of patients; 89.2% thought PCC improved the quality of patients' life; there were 91.6%, 95.2%, 90.4% physicians who felt it relieved the anxiety of patients, of family members and of care providers, respectively. There were 96.4% physicians who felt it could ease the tension in physician-patient relationship; 97.6% felt it lower the risk for medical negligence, and 96.4% of doctors who applied for PPC felt satisfied with PCC service in terms of process and achieving objectives of consultation. More primary-team physician agree "PCC service helps the physicians better understand palliative care" than PCC members(97.6% vs. 80%, P<0.05), while both were interested in learning more on palliative medicine(100% vs. 96.4%, P>0.05).Conclusion Palliative care consultation service in a general hospital is efficacious and acclaimed.The primary care physicians and the PCC members hold positive attitudes to the benefits that the PCC services bring to patients, family members, and physicians themselves. PCC for terminal patients in a general hospital may serve as a good modle for promotion of palliative care in China.展开更多
A tunable,controllable,and reversible photoresponse within a single device holds significant potential for broad-spectrum image detection,convolutional computation,and autonomous systems.This study presents a novel gr...A tunable,controllable,and reversible photoresponse within a single device holds significant potential for broad-spectrum image detection,convolutional computation,and autonomous systems.This study presents a novel graphene-gated WSe_(2) heterojunction field-effect transistor(FET),utilizing graphene as a highly transparent gate electrode.By modulating the graphene-gated voltage,which affects the effective bias voltage,the current is redirected into both the graphene and metal electrodes along the WSe_(2).The device exhibits notable and adjustable positive photoconductance(V_(g)<3.25 V)and negative photoconductance(V_(g)>3.25 V)under 520 nm illumination.The responsivity of positive photocon-ductance(V_(g)=-5 V)and negative photoconductance(V_(g)=5 V)values are 427 and 425 mA/W,respectively.Additionally,the device demonstrates excellent performance,with a high fitting exponent(0.99)between power intensity and photocurrent at zero bias due to the photovoltaic effect.Leveraging its controllable and reversible photoresponse,along with the photovoltaic effect,the graphene-gated WSe_(2) heterojunction FET enables multifunctional applications,including encrypted communication,“OR”logic operations,three-state logic gates and imaging pre-processing.Besides,images can be pre-processed and enhanced by integrating convolutional neural networks.These findings highlight the promising potential of high-performance multifunctional optoelectronic devices.展开更多
基金supported by the National Natural Science Foundation of China(22308170).
文摘Temperature is a critical factor influencing the performance of coal catalytic hydrogasification in bubbling fluidized bed gasifiers.Numerical simulations at various temperatures(1023 K,1073 K,1123 K,and 1173 K)are conducted to elucidate the mechanisms by which temperature affects bubble size,global reaction performance,and particle-scale reactivity.The simulation results indicate that bubble size increases at elevated temperatures,while H_(2)-char hydrogasification reactivity is enhanced.Particle trajectory analyses reveal that particles sized between 100 and 250μm undergo intense char hydrogasification in the dense phase,contributing to the formation of hot spots.To assess the impact of temperature on the particle-scale flow-transfer-reaction process,the dimensionless quantities of Reynolds,Nusselt,and Sherwood numbers,along with the solids dispersion coefficient,are calculated.It is found that higher temperatures inhibit bubble-induced mass and heat transfer.In general,3 MPa,1123 K,and 3-4 fluidization numbers are identified as the optimal conditions for particles ranging from 0 to350μm.These findings provide valuable insights into the inherent interactions between temperature and gas-particle reaction.
基金Supported by The National High Level Hospital Clinical Research Funding,No.2022-PUMCH-B-132.
文摘BACKGROUND Indolent NK-cell lymphoproliferative disorder of the gastrointestinal tract(iNKLPD)is a rare and recently defined entity,recognized in the 2022 WHO classification of hematolymphoid tumors.iNKLPD typically exhibits a benign or slowly progressive clinical course,with disease localized to the gastrointestinal tract.Here,we present what we believe to be the first reported case of iNKLPD associated with protein-losing enteropathy(PLE),characterized by a poor response to chemotherapy and rapid clinical deterioration,culminating in death within a few months.CASE SUMMARY We report the case of a 64-year-old man who presented with bilateral lower-extremity edema and fatigue.Laboratory tests revealed marked hypoalbuminemia,while other liver function parameters remained within normal limits.Renal and cardiac function assessments were unremarkable.Histopathological examination of endoscopic biopsies confirmed a diagnosis of iNKLPD of the gastrointestinal tract.The patient was treated with oral prednisone and cyclosporine,which led to temporary improvement in both symptoms and serum albumin levels.However,disease relapse occurred during corticosteroid tapering,accompanied by worsening hypoalbu-minemia and refractory diarrhea.The patient died eight months after diagnosis,likely due to disease progression or severe treatment-related complications.CONCLUSION iNKLPD generally exhibits an indolent course;nonetheless,the prognosis may be poor if secondary PLE is involved.
基金National Natural Science Foundation of China(22308170)A Project Supported by Scientific Research Fund of Zhejiang Provincial Education Department(Y202250270)+2 种基金Key research and development project of Shanxi Province(202102090301029)Scientific Research Incubation Program of Ningbo University of Technology(2022TS12)Scientific Research Project Funded by Ningbo University of Technology(2022KQ04).
文摘Coal catalytic hydrogasification(CCHG)is a straightforward approach for producing CH_(4),which shows advantages over the mature coal-to-CH_(4) technologies from the perspectives of CH_(4) yield,thermal efficiency,and CO_(2) emission.The core of CCHG is to make carbon in coal convert into CH_(4) efficiently with a catalyst.In the past decades,intensive research has been devoted to catalytic hydrogasification of model carbon(pitch coke,activated carbon,coal char).However,the chemical process of CCHG is still not well understood because the coal structure is more complicated,and CCHG is a combination of coal catalytic hydropyrolysis and coal char catalytic hydrogasification.This review seeks to shed light on the catalytic process of raw coal during CCHG.The configuration of suitable catalysts,operating conditions,and feedstocks for tailoring CH_(4) formation were identified,and the underlying mechanisms were elucidated.Based on these results,the CCHG process was evaluated,emphasizing pollutant emissions,energy efficiency,and reactor design.Furthermore,the opportunities and strategic approaches for CCHG under the restraint of carbon neutrality were highlighted by considering the penetration of“green”H2,biomass,and CO_(2) into CCHG.Preliminary investigations from our laboratories demonstrated that the integrated CCHG and biomass/CO_(2) hydrogenation process could perform as an emerging pathway for boosting CH_(4) production by consuming fewer fossil fuels,fulfilling the context of green manufacturing.This work not only provides systematic knowledge of CCHG but also helps to guide the efficient hydrogenation of other carbonaceous resources such as biomass,CO_(2),and coal-derived wastes.
基金supported by the Educational Reform Project of Peking Union Medical College(2015zlgc012)~~
文摘Objectives The in-hosptial palliative care consultation(PCC) is emerging as a routine service in some medical center in China. The current study evaluated how physicians in primary care team and consultation team perceive the PCC service for the purpose of investigating the effectiveness of this consultation model in a general hospital.Methods In-hosptial palliative care consultations have been carried out at Peking Union Medical College Hosptial by a dedicated consultation team, and 37 consultations were completed in 2016. A questionnaire was designed for physicians in terms of its benefits to patients,their family as well as the primary care team. Physicians who applied for consultation in 2016 formally(requested from the department other than the Geriatrics) and informally(by rotating residents and unemployed visiting doctors in geriatric department) were invited to participate in the survey by scanning a two dimentional code on social networking platform.Results There were 103 physicians participated in the survey, including primary care physicians from the department of Internal Medicine(n=8), Gynaecology(n=16) and Surgery(n=13), rotating residents(n=30), visiting doctors(n=16) in Geriatric department, and PCC team members(n=20). 94.0% of the non-PCC physicians agreed that PCC relieved the suffering of patients; 89.2% thought PCC improved the quality of patients' life; there were 91.6%, 95.2%, 90.4% physicians who felt it relieved the anxiety of patients, of family members and of care providers, respectively. There were 96.4% physicians who felt it could ease the tension in physician-patient relationship; 97.6% felt it lower the risk for medical negligence, and 96.4% of doctors who applied for PPC felt satisfied with PCC service in terms of process and achieving objectives of consultation. More primary-team physician agree "PCC service helps the physicians better understand palliative care" than PCC members(97.6% vs. 80%, P<0.05), while both were interested in learning more on palliative medicine(100% vs. 96.4%, P>0.05).Conclusion Palliative care consultation service in a general hospital is efficacious and acclaimed.The primary care physicians and the PCC members hold positive attitudes to the benefits that the PCC services bring to patients, family members, and physicians themselves. PCC for terminal patients in a general hospital may serve as a good modle for promotion of palliative care in China.
基金the National Natural Science Foundation of China(Nos.11974122 and U22A2073)the Scientific and Technological Plan of Guangdong Province,China(No.2022A0505050067)+2 种基金the Open Research Project Programme of the Macao Centre for Research and Development in Advanced Materials(University of Macao)(No.MCRDAM-IAPME(UM)-2022-2024/ORP/XXX/2023)the Guangdong Basic and Applied Basic Research Foundation(No.2022A1515011242)the Scientific Research Innovation Project of Graduate School of South China Normal University.
文摘A tunable,controllable,and reversible photoresponse within a single device holds significant potential for broad-spectrum image detection,convolutional computation,and autonomous systems.This study presents a novel graphene-gated WSe_(2) heterojunction field-effect transistor(FET),utilizing graphene as a highly transparent gate electrode.By modulating the graphene-gated voltage,which affects the effective bias voltage,the current is redirected into both the graphene and metal electrodes along the WSe_(2).The device exhibits notable and adjustable positive photoconductance(V_(g)<3.25 V)and negative photoconductance(V_(g)>3.25 V)under 520 nm illumination.The responsivity of positive photocon-ductance(V_(g)=-5 V)and negative photoconductance(V_(g)=5 V)values are 427 and 425 mA/W,respectively.Additionally,the device demonstrates excellent performance,with a high fitting exponent(0.99)between power intensity and photocurrent at zero bias due to the photovoltaic effect.Leveraging its controllable and reversible photoresponse,along with the photovoltaic effect,the graphene-gated WSe_(2) heterojunction FET enables multifunctional applications,including encrypted communication,“OR”logic operations,three-state logic gates and imaging pre-processing.Besides,images can be pre-processed and enhanced by integrating convolutional neural networks.These findings highlight the promising potential of high-performance multifunctional optoelectronic devices.
