检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

扑翼的推力特性与功率特性的实验研究

西北工业大学学报 2016年第6期34卷 976-981页

作者：付鹏宋笔锋梁少然杨文青西北工业大学航空学院陕西西安710072

针对扑翼实验动态特性强、测控变量多的特点,设计了一种实验专用的扑动机构,在实现对扑动频率和扑动幅度精确调控的同时,集成了对瞬时扑动角度和输入功率的测量功能,建立了一套适用于扑翼风洞实验的测控系统,能够实现对动态气动力、扑... 详细信息

针对扑翼实验动态特性强、测控变量多的特点,设计了一种实验专用的扑动机构,在实现对扑动频率和扑动幅度精确调控的同时,集成了对瞬时扑动角度和输入功率的测量功能,建立了一套适用于扑翼风洞实验的测控系统,能够实现对动态气动力、扑动角度、扑动翼输入功率等量的实时同步测量;在此基础上针对扑翼的推力特性和功率特性进行了风洞实验研究,着重分析了在不同扑动频率和不同扑动幅度情况下扑翼的推力与功率特性;实验结果表明,在研究的范畴内,扑动频率和扑动幅度的增大都有利于推力的产生,但都会增大对应的功耗;推力和功耗都随St的增大呈"J"型曲线增长,当St小于0.25时,推力和功耗的增长趋势较缓,随着St的增大,尤其当St大于0.3时,推力和功耗将大幅增大。

关键词：微型扑翼飞行器推力特性功率特性风洞实验测控系统

Electrochemical conversion of methane to bridge the gap in the artificial carbon cycle

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 286-308页

作者： Yuhao peng Yuefeng song Ihar Razanau Juanxiu Xiao Wei Xiao Di Hu Guoxiong Wang College of Chemistry and Molecular Sciences Hubei Key Laboratory of Electrochemical Power Sources Wuhan University State Key Laboratory of Catalysis Dalian National Laboratory for Clean Energy iChEM (Collaborative Innovation Center of Chemistry for Energy Materials) Dalian Institute of Chemical Physics Chinese Academy of Sciences Laboratory of Physical-Chemical Technologies SSPA Scientific and Practical Materials Research Centre of NAS of Belarus State Key Laboratory of Marine Resources Utilization in South China Sea Collaborative Innovation Center of Marine Science and Technology School of Marine Science and Engineering Hainan University Department of Chemical and Environmental Engineering University of Nottingham Ningbo China

Methane, an abundant one-carbon（C1） resource, is extensively used in the industrial production of vital fuels and value-added chemicals. However, current industrial methane conversion technologies are energy-and carbon-intensive, mainly due to the high activation energy required to break the inert C–H bond, low selectivity, and problematic side reactions, including CO2emissions and coke deposition. Electrochemical conversion of methane（ECM） using intermittent renewable energy offers an attractive solution, due to its modular reactor design and operational flexibility across a broad spectrum of temperatures and pressures. This review emphasizes conversion pathways of methane in various reaction systems, highlighting the significance and advantages of ECM in facilitating a sustainable artificial carbon cycle. This work provides a comprehensive overview of conventional methane activation mechanisms and delineates the complete pathways of methane conversion in electrolysis contexts. Based on surface/interface chemistry, this work systematically analyzes proposed reaction pathways and corresponding strategies to enhance ECM efficiency towards various target products, including syngas, hydrocarbons, oxygenates, and advanced carbon materials. The discussion also encompasses opportunities and challenges for the ECM process, including insights into ECM pathways, rational electrocatalyst design, establishment of benchmarking protocols, electrolyte engineering, enhancement of CH4conversion rates, and minimization of CO2emission.

关键词： Methane Electrochemical conversion Reaction mechanism Catalyst design Electrode Electrocatalysis

Significant loss of soil inorganic carbon at the continental scale

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

National Science Review 2022年第2期9卷 13-20页

作者： Xiao-Dong song Fei Yang Hua-Yong Wu Jing Zhang De-Cheng Li Feng Liu Yu-Guo Zhao Jin-Ling Yang Bing Ju Chong-Fa Cai Biao Huang Huai-Yu Long Ying Lu Yue-Yu Sui Qiu-Bing Wang Ke-Ning Wu Feng-Rong Zhang Ming-Kui Zhang Zhou Shi Wan-Zhu Ma Gang Xin Zhi-Ping Qi Qing-Rui Chang En Ci Da-Gang Yuan Yang-Zhu Zhang Jun-Ping Bai Jia-Ying Chen Jie Chen Yin-Jun Chen Yun-Zhong Dong Chun-Lan Han Ling Li Li-Ming Liu Jian-Jun Pan fu-peng song fu-Jun Sun Deng-Feng Wang Tian-Wei Wang Xiang-Hua Wei Hong-Qi Wu Xia Zhao Qing Zhou Gan-Lin Zhang State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences College of Advanced Agricultural Sciences University of Chinese Academy of Sciences College of Resources and Environment Huazhong Agricultural University Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences College of Natural Resources and Environment South China Agricultural University Northeast Institute of Geography and Agroecology Chinese Academy of Sciences College of Land and Environment Shenyang Agricultural University School of Land Science and Technology China University of Geosciences College of Land Science and Technology China Agricultural University College of Environmental and Resource Sciences Zhejiang University Institute of Digital Agriculture Zhejiang Academy of Agricultural Sciences College of Agriculture Heilongjiang Bayi Agricultural University Tropical Crops Genetic Resources Institute Chinese Academy of Tropical Agricultural Sciences College of Natural Resources and Environment Northwest A & F University College of Resources and Environment Southwest University College of Resources Sichuan Agricultural University College of Resources and Environment Hunan Agricultural University Institute of Agricultural Product Quality Standard and Testing Research Tibet Academy of Agricultural and Animal Husbandry Sciences School of Agricultural Sciences Zhengzhou University Institute of Agriculture Environment and Resources Research Shanxi Academy of Agricultural Sciences College of Resources and Environment Henan Agricultural University College of Resources and Environment China Agricultural University College of Resources and Environmental Sciences Nanjing Agricultural University College of Resources and Environment Shandong Agricultural University Agricultural College Guangxi University College of Grassland and Environment Science Xinjiang Agricultural University College of Geographical Science Qinghai Normal University

Widespread soil acidification due to atmospheric acid deposition and agricultural fertilization may greatly accelerate soil carbonate dissolution and ***,to date,few studies have addressed these ***,we use meta-analysis and nationwide-survey datasets to investigate changes in soil inorganic carbon(SIC) stocks in *** observe an overall decrease in SIC stocks in topsoil(0-30 cm)(11.33 g C m-2yr-1) from the 1980 s to the 2010 *** SIC stocks have decreased by～8.99±2.24%(1.37±0.37 Pg C).The average SIC losses across China(0.046 Pg C yr-1) and in cropland(0.016 Pg C yr-1) account for～17.6%-24.0% of the terrestrial C sink and 57.1% of the soil organic carbon sink in cropland,*** deposition and climate change have profound influences on SIC *** estimate that～19.12%-19.47% of SIC stocks will be further lost by *** consumption of SIC may offset a large portion of global efforts aimed at ecosystem carbon sequestration,which emphasizes the importance of achieving a better understanding of the indirect coupling mechanisms of nitrogen and carbon cycling and of effective countermeasures to minimize SIC loss.

关键词： China soil inorganic carbon stocks global change carbonate soil acidification

Extramedullary plasmacytoma with the uvula as first affected site:A case report

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Oncology 2025年第1期16卷 53-58页

作者： Jing Yang Hui peng Sheng-Ke Tu Min Li Kui song Department of Hematology The First Affiliated Hospital of Jishou UniversityJishou 416000Hunan ProvinceChina Department of Pharmacy The First Affiliated Hospital of Jishou UniversityJishou 416000Hunan ProvinceChina

BACKGROUND Extramedullary plasmacytoma(EMP)represents one of the rarer forms of plasma cell malignancies,capable of impacting a variety of tissues and organs throughout the *** majority of EMP cases are predominantly found in the head and neck region,especially within the laryngopharynx,as well as in the gastrointestinal *** there have been documented instances of oropharyngeal involvement in EMP cases in the academic literature,it is important to note that EMP specifically affecting the uvula is exceedingly ***,it is noteworthy that over 60% of epithelial carcinomas in the upper respiratory tract and oropharynx tend to metastasize to the cervical lymph nodes,indicating a propensity for regional spread in these types of *** this context,we present a rare case of extramedullary plasmacytoma where the uvula served as the initially affected *** case emphasizes the need for heightened awareness among clinicians regarding such unusual comorbidities,as early recognition and diagnosis can significantly influence patient management and treatment *** addition,a review of the relevant literature is included to further educate and inform healthcare professionals about this rare presentation,ultimately aiming to enhance clinical understanding and improve patient care in similar *** SUMMARY A 51-year-old man was admitted to our hospital because of a slowly enlarging neck mass.A physical examination revealed a palpable left lymph node,and magnetic resonance imaging(MRI)of the oropharynx and the neck showed a soft tissue mass in the oropharynx and enlargement of multiple lymph nodes in the *** soft tissue mass was diagnosed as plasmacytoma by immunohistochemical *** immunoglobulins and bone marrow biopsy showed normal ***,we diagnosed that as EMP of the *** four cycles of adjuvant chemotherapy dominated by bortezomib,MRI reexamination showed a significant reduction of the mass

关键词： Extramedullary plasmacytoma Plasmacytoma Uvula Multiple myeloma Case report

Impacts of the annual cycle of background SST in the tropical Pacific on the phase and amplitude of ENSO

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Atmospheric and Oceanic Science Letters 2025年第1期18卷 12-17页

作者： song Jiang Congwen Zhu Ning Jiang State Key Laboratory of Severe Weather(LASW) Chinese Academy of Meteorological SciencesBeijingChina College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijingChina

The dominant annual cycle of sea surface temperature(SST)in the tropical Pacific exhibits an antisymmetric mode,which explains 83.4%total variance,and serves as a background of El Niño-Southern Oscillation(ENSO).However,there is no consensus yet on its anomalous impacts on the phase and amplitude of *** on data during 1982-2022,results show that anomalies of the antisymmetric mode can affect the evolution of ENSO on the interannual scale via Bjerknes feedback,in which the positive(negative)phase of the antisymmetric mode can strengthen El Niño(La Niña)in boreal winter via an earlier(delayed)seasonal cycle transition and larger(smaller)annual *** magnitude of the SST anomalies in the equatorial eastern Pacific can reach more than±0.3◦C,regulated by the changes in the antisymmetric mode based on random sensitivity *** reveal the spatial pattern of the annual cycle associated with the seasonal phase-locking of ENSO evolution and provide new insight into the impact of the annual cycle of background SST on ENSO,which possibly carries important implications for forecasting ENSO.

关键词： Annual cycle SST anomaly Antisymmetric mode ENSO

老年2型糖尿病患者血清sCXCL16水平与糖尿病肾病进展及预后的关联性研究

在线全文

学校读者我要写书评

暂无评论

中国临床新医学 2023年第10期16卷 1042-1048页

作者：曾真彭夫松王洪江清华大学附属垂杨柳医院老年医学科北京100000 首都医科大学附属北京朝阳医院心内科北京100020

目的探讨老年2型糖尿病(T2DM)患者血清可溶性CXC趋化因子配体16(sCXCL16)水平与糖尿病肾病(DKD)进展及预后的关联性。方法招募2017年4月至2020年1月清华大学附属垂杨柳医院收治的55例DKD患者(DKD组)和54例单纯T2DM患者(T2DM组)为研究... 详细信息

目的探讨老年2型糖尿病(T2DM)患者血清可溶性CXC趋化因子配体16(sCXCL16)水平与糖尿病肾病(DKD)进展及预后的关联性。方法招募2017年4月至2020年1月清华大学附属垂杨柳医院收治的55例DKD患者(DKD组)和54例单纯T2DM患者(T2DM组)为研究对象,另选择55名体检健康者作为对照组。比较三组血清sCXCL16水平,并分析其与DKD进展及预后的关联性。结果 DKD组和T2DM组血清sCXCL16水平均高于对照组,且DKD组血清sCXCL16水平高于T2DM组,差异有统计学意义(P18.50 ng/ml是促进老年T2DM患者DKD发生的独立危险因素(P<0.05)。受试者工作特征(ROC)曲线分析结果显示,血清sCXCL16水平能有效鉴别T2DM和DKD[AUC(95%CI)=0.866(0.801~0.931),P<0.001],并能有效预测DKD患者发生终末期肾脏病(ESRD)[AUC(95%CI)=0.854(0.747~0.962),P<0.001]。多因素Cox回归分析结果显示,血清sCXCL16水平≥20.02 ng/ml是促进DKD患者发生ESRD的独立危险因素(P<0.05)。结论老年T2DM患者血清sCXCL16水平升高与DKD的发生、发展密切相关,其水平监测有助于临床医师评估患者病情。

关键词： 2型糖尿病 CXC趋化因子配体16 糖尿病肾病预后

Anlotinib-induced sick sinus syndrome:Two case reports

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2025年第6期13卷 30-34页

作者： Cheng-Feng fu Li-Fen Yang Lei Tian song Deng Qi Zhang Biao Yao Department of Oncology Tongren People’s HospitalTongren 554300Guizhou ProvinceChina Department of Oncology Guizhou Provincial People’s HospitalGuiyang 550000Guizhou ProvinceChina

BACKGROUND This manuscript describes the first known cases of sick sinus syndrome(SSS)associated with the use of anlotinib in non-small cell lung cancer patients,highlighting the need for increased vigilance and cardiac *** SUMMARY Two patients with non-small cell lung cancer developed SSS after 15 months and 5 months of anlotinib treatment,respectively,presenting with syncope and *** confirmed SSS,and different treatment approaches were taken for each *** patient received a dual-chamber permanent pacemaker,while the other discontinued the medication and experienced symptom *** Anlotinib can induce SSS,suggesting that cardiac monitoring is crucial during anlotinib *** management strategies are necessary for affected individuals.

关键词： Lung cancer Anlotinib Sick sinus syndrome Cardiac pacemaker Adverse drug reaction Case report

Constraints on holographic QCD phase transitions from PTA observations

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 71-78页

作者： song He Li Li Sai Wang Shao-Jiang Wang Center for Theoretical Physics and College of Physics Jilin University School of Physical Science and Technology Ningbo University Max Planck Institute for Gravitational Physics (Albert Einstein Institute) CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences School of fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of Sciences (UCAS) School of Physical Sciences University of Chinese Academy of Sciences (UCAS) Theoretical Physics Division Institute of High Energy Physics Chinese Academy of Sciences

The underlying physics of QCD phase transition in the early Universe remains largely unknown due to its strong-coupling nature during the quark-gluon plasma/hadron gas transition, yet a holographic model has been proposed to quantitatively fit the lattice QCD data while with its duration of the first-order phase transition(FoPT) left undetermined. At specific baryon chemical potential, the first-order QCD phase transition agrees with the observational constraint of baryon asymmetry. It, therefore, provides a scenario for phase transition gravitational waves(GWs) within the standard model of particle physics. If these background GWs could contribute dominantly to the recently claimed common-spectrum red noise from pulsar timing array(PTA) observations, the duration of this FoPT can be well constrained, and the associated primordial black holes are still allowed by current observations.

关键词： pulsar timing array QCD phase transition gravitational waves primordial black holes

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

三峡库区淹没带2种濒危植物的新记录

武汉植物学研究 2001年第2期19卷 171-172页

作者：叶其刚陈树森许天全彭辅松王诗云中国科学院武汉植物研究所武汉430074

近年来，笔者在调查三峡库区稀有濒危植物及地方特有植物的过程中，新发现2种濒危植物在库区淹没带1)有分布。由于是永久性淹没，必然会造成该区这部分濒危植物种群及其生境的消失，应引起有关科研及保护部门的重视。以下就这2种植物的... 详细信息

近年来，笔者在调查三峡库区稀有濒危植物及地方特有植物的过程中，新发现2种濒危植物在库区淹没带1)有分布。由于是永久性淹没，必然会造成该区这部分濒危植物种群及其生境的消失，应引起有关科研及保护部门的重视。以下就这2种植物的分布、用途，在库区淹没带的生境、种群数量、伴生植物及在中国科学院武汉植物园的引种适应情况等进行介绍。

关键词：三峡库区淹没带松叶蕨狭叶瓶尔小草濒危植物