检索结果-南通市图书馆

A Statistical Study of Magnetic Flux Emergence in Solar Active Regions Prior to Strongest Flares

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2024年第4期24卷 147-160页

作者： Alexander S.Kutsenko Valentina i.Abramenko Andrei A.Plotnikov Crimean Astrophysical Observatory p/o NauchnyCrimea298409Russia

Using the data on magnetic field maps and continuum intensity for Solar Cycles 23 and 24,we explored 100 active regions(ARs)that produced M5.0 or stronger *** focus on the presence/absence of the emergence of magnetic flux in these ARs 2-3 days before the strong flare *** found that 29 ARs in the sample emerged monotonically amidst quiet-Sun.A major emergence of a new magnetic flux within a pre-existing AR yielding the formation of a complex flare-productive configuration was observed in another 24 *** 30 ARs,an insignificant(in terms of the total magnetic flux of pre-existing AR)emergence of a new magnetic flux within the pre-existing magnetic configuration was observed;for some of them the emergence resulted in a formation of a configuration with a small δ-sunspot;11 out of 100 ARs exhibited no signatures of magnetic flux emergence during the entire interval of *** six cases the emergence was in progress when the AR appeared on the Eastern limb,so that the classification and timing of emergence were not *** conclude that the recent flux emergence is not a necessary and/or sufficient condition for strong flaring of an *** flux emergence rate of flare-productive ARs analyzed here was compared with that of flare-quiet ARs analyzed in our previous *** revealed that the flare-productive ARs tend to display faster emergence than the flare-quiet ones do.

关键词： Sun:activity Sun:flares Sun:magnetic fields

Radiative loss of coherence in free electrons:a long-range quantum phenomenon

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2024年第2期13卷 294-301页

作者： Cruz i.Velasco Valerio Di Giulio F.Javier García de Abajo iCFO-institut de Ciencies Fotoniques The Barcelona Institute of Science and Technology08860Castelldefels(Barcelona)Spain iCREA-institucióCatalana de Recerca i Estudis Avançats Passeig Lluís Companys 2308010BarcelonaSpain

Quantum physics rules the dynamics of small objects as they interact over microscopic length ***,quantum correlations involving macroscopic distances can be observed between entangled photons as well as in atomic gases and matter waves at low *** long-range nature of the electromagnetic coupling between charged particles and extended objects could also trigger quantum phenomena over large ***,we reveal a manifestation of quantum mechanics that involves macroscopic distances and results in a nearly complete depletion of coherence associated with which-way free-electron interference produced by electron-radiation coupling in the presence of distant extended *** is a ubiquitous effect that we illustrate through a rigorous theoretical analysis of a two-path electron beam interacting with a semi-infinite metallic plate and find the inter-path coherence to vanish proportionally to the path separation at zero temperature and exponentially at finite *** investigated regime of large distances originates in the coupling of the electron to radiative modes assisted by diffraction at material structures but without any involvement of material *** the fundamental interest of this macroscopic quantum phenomenon,our results suggest an approach to measuring the vacuum temperature and nondestructively sensing the presence of distant objects.

关键词： temperature quantum macroscopic

Renin-angiotensin system inhibitors prescriptions in Chinese hospitalized chronic kidney disease patients

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2024年第17期12卷 3061-3075页

作者： Chun Zhang Zhi-Yu Duan sa-sa Nie Zhou Zhang Xin-Ru Guo Chao-Yang Zhang Jing Dong Guang-Yan Cai Department of Nephrology The First Medical CentreChinese PLA General HospitalBeijing 100853China School of Medicine Nankai UniversityTianjin 300071China National Engineering Laboratory for Medical Big Data Application Technology Chinese PLA General HospitalBeijing 100853China

BACKGROUND Many guidelines have recommended renin-angiotensin system inhibitors(RASi)as the first-line treatment for patients with chronic kidney disease(CKD).We studied RASi prescription trends from 2010 to 2019,and analyzed the characteristics associated with RASi prescription in Chinese hospitalized CKD *** To study the prescription of renin angiotensin system inhibitors in hospitalized patients with CKD in *** it was retrospectively,cross-sectional reviewed RASi prescriptions in hospitalized CKD patients in China from 2010 to *** prescribing trends were analyzed from 2010 to 2019,and bivariate and multivariate logistic regression analyses were conducted to identify characteristics associated with RASi *** A total of 35090 CKD patients were included,with 10043(28.6%)RASi *** these patients,18919(53.9%)met the criteria for RASi treatments based on the 2012 kidney disease:improving global outcomes *** these,7246(38.3%)patients received RASi *** prescriptions showed an initial rapid increase from 2011 to 2012,reached its peak around 2015 and 2016,and then exhibited a subsequent slight decreasing *** bivariate and multivariate analyses showed that several characteristics,including the male gender,age less than 60-year-old,nephrology department admission,lower CKD stage,history of hypertension or diabetes,proteinuria,glomerulonephritis as the CKD etiology,and non-acute kidney injury were associated with RASi *** The frequency of RASi prescriptions showed an initial increase but a slight decreasing trend in more recent *** patients with certain characteristics such as elderly age,advanced disease stage,surgery department admission,or acute kidney injury were less likely to receive RASi *** the application of RASi in hospitalized CKD patients is *** actual clinical practice needs to be *** development of related research

关键词： Chronic kidney disease Renin-angiotensin system inhibitors Prescriptions Adherence

Particle Size Optimization of Thermochemical salt Hydrates for High Energy Density Thermal Storage

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Energy & Environmental Materials 2024年第2期7卷 326-333页

作者： Andrew Martin Drew Lilley Raνi Prasher Sumanjeet Kaur Energy Technologies Area Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA Department of Mechanical Engineering UC BerkeleyBerkeleyCA 94720USA

Thermal energy storage(TES)solutions offer opportunities to reduce energy consumption,greenhouse gas emissions,and ***,they can help reduce the peak load and address the intermittency of renewable energy sources by time shifting the load,which are critical toward zero energy *** materials(TCMs)as a class of TES undergo a solid-gas reversible chemical reaction with water vapor to store and release energy with high storage capacities(600 kWh m^(-3))and negligible self-discharge that makes them uniquely suited as compact,stand-alone units for daily or seasonal ***,TCMs suffer from instabilities at the material(salt particles)and reactor level(packed beds of salt),resulting in poor multi-cycle efficiency and high-levelized cost of *** this study,a model is developed to predict the pulverization limit or Rcrit of various salt hydrates during thermal *** is critical as it provides design rules to make mechanically stable TCM composites as well as enables the use of more energy-efficient manufacturing process(solid-state mixing)to make the *** model is experimentally validated on multiple TCM salt hydrates with different water content,and effect of Rcrit on hydration and dehydration kinetics is also investigated.

关键词： high energy density hydration kinetics long-term cycling thermal energy storage thermochemical materials

ionogels and eutectogels for stable and long-term EEG and EMG signal acquisition

在线全文

学校读者我要写书评

暂无评论

Materials Futures 2024年第3期3卷 95-110页

作者： Asmita Veronica Hnin Yin Yin Nyein i-Ming Hsing Department of Chemical and Biological Engineering The Hong Kong University of Science and TechnologyClear Water BayHong Kong Special Administrative Region of ChinaPeople’s Republic of China

Neurological injuries and disorders have a significant impact on individuals’quality of life,often resulting in motor and sensory *** assess motor performance and monitor neurological disorders,non-invasive techniques such as electroencephalography(EEG)and electromyography(EMG)are commonly *** employed wet electrodes with conductive gels are limited by lengthy skin preparation time and allergic *** dry electrodes and hydrogel-based electrodes can mitigate these issues,their applicability for long-term monitoring is *** electrodes are susceptible to motion artifacts,whereas hydrogel-based electrodes face challenges related to water-induced ***,ionogels and eutectogels derived from ionic liquids and deep eutectic solvents have gained immense popularity due to their non-volatility,ionic conductivity,thermal stability,and ***,in particular,exhibit superior *** characteristics make them suitable alternatives for the development of safer,robust,and reliable EEG and EMG ***,research specifically focused on their application for EEG and EMG signal acquisition remains *** article explores the electrode requirements and material advancements in EEG and EMG sensing,with a focus on highlighting the benefits that ionogels and eutectogels offer over conventional *** sheds light on the current limitations of these materials and proposes areas for further improvement in this *** potential of these gel-based materials to achieve a seamless interface for high-quality and long-term electrophysiological signal acquisition is *** the unique properties of ionogels and eutectogels holds promise for future advancements in EEG and EMG electrode materials,leading to improved monitoring systems and enhanced patient outcomes.

关键词： ionogel eutectogel electrode electroencephalography electromyography

Study of the Biological Quality of the Water in the Manantali Dam Reservoir: Analysis of the Fish Fauna and Plankton Communities

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Agricultural Chemistry and Environment 2024年第1期13卷 100-114页

作者： Joseph Mbeur Faye saïdou Ndao Louis Eugène Victor sambou Laboratory of Water and Environment Sciences and Technologies (LaSTEE) Polytechnic School of Thies (EPT) Thies Senegal UFR Sciences et Technologies (SET) University Iba Der Thiam of Thies (UIDT) Thies Senegal

The aim of this study of the Manantali dam reservoir is to investigate the biological quality of the water through inventories and analysis of the ichthyofauna and planktonic communities (zooplankton and phytoplankton). inventories of ichthyofauna and plankton communities were carried out quarterly from 2003 to 2022. The fish populations studied on the basis of bioindicators (species richness, diversity index, equitability index, diversification index) identified 29 species belonging to 10 families. The Cichlidae family is the most represented, while the Schilbeidae and Tetraodontioae families are less represented in terms of number of species. The species Hydrocynus forskalii and Brycinus nurse with relative abundances of 40.12% and 21.4% respectively, both from the family Alestidae, are the most abundant. The species H. forskalii has a frequency of occurrence of 100%. The specific diversity index of 2.9 and the equitability index of 0.6 show an average diversity of fish species. The diversification index of 2.9 indicates a theoretical number of habitats of 2 to 3. The planktonic community is made up of zooplankton and phytoplankton. The inventory of zooplankton shows the presence of 28 zooplankton species belonging to 9 families of the three zooplankton groups Rotifera, Cladocera and Copepoda. Analysis of the frequencies of occurrence of the various taxa showed that the characteristic species of Lake Manantali are the omnipresent rotifers Keratella cochlearis, Keratella quadrata and Trichocerca chattoni. For phytoplankton, the inventories carried out show the presence of 65 species belonging to 5 families (Chlorophycees, Diatomees, Dinophycees, Chrysophycees and Cyanophycees). An analysis of the frequency of occurrence of the various taxa shows that the characteristic species of Lake Manantali are Chlorophycees, with 7 species: Desmidium baileyi, Micrasterias alata, Sphaerocystis schroeteri, Spondylosium sp., Staurastrum heimii, Staurastrum subanchora, Staurodesmu

关键词： inventory Fish Zooplankton Phytoplankton Diversity Manantali

日语授受表达“Vてあげる”“Vてさしあげる”的情境化研究——以日语教材中的例句为中心

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

西北成人教育学院学报 2024年第3期 64-69页

作者：李飒黄忠东北师范大学外国语学院吉林长春130024 河北工业大学廊坊分校河北廊坊065000

本研究聚焦于日语教学中“Vてあげる”和“Vてさしあげる”的实际运用问题,通过对日语教材中例句的具体情境分析,揭示了教材提供的例句过于抽象,缺乏真实交流场景下的应用练习等问题。研究表明,为提高学习者的实际运用能力,教材设计应... 详细信息

本研究聚焦于日语教学中“Vてあげる”和“Vてさしあげる”的实际运用问题,通过对日语教材中例句的具体情境分析,揭示了教材提供的例句过于抽象,缺乏真实交流场景下的应用练习等问题。研究表明,为提高学习者的实际运用能力,教材设计应更多考虑语言使用的实际场景,教师在教学过程中也应引导学生理解并模仿合适的情境中的语法运用。这一发现对于日语教材编写和教学方法的改进提供了重要参考,有助于提升学习者的交际能力。

关键词：日语授受表达 Vてあげる Vてさしあげる情境化日语教材

Data-driven modeling on anisotropic mechanical behavior of brain tissue with internal pressure

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2024年第3期33卷 55-65页

作者： Zhiyuan Tang Yu Wang Khalil i.Elkhodary Zefeng Yu Shan Tang Dan Peng State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial EquipmentDalian University of Technology116023DalianPR China The Department of Mechanical Engineering The American University in CairoNew Cairo11835Egypt Department of Neurology The Second Hospital of Dalian Medical UniversityDalian116023PR China

Brain tissue is one of the softest parts of the human body,composed of white matter and grey *** mechanical behavior of the brain tissue plays an essential role in regulating brain morphology and brain ***,traumatic brain injury(TBi)and various brain diseases are also greatly influenced by the brain's mechanical *** white matter or grey matter,brain tissue contains multiscale structures composed of neurons,glial cells,fibers,blood vessels,etc.,each with different mechanical *** such,brain tissue exhibits complex mechanical behavior,usually with strong nonlinearity,heterogeneity,and directional *** a constitutive law for multiscale brain tissue using traditional function-based approaches can be very ***,this paper proposes a data-driven approach to establish the desired mechanical model of brain *** focus on blood vessels with internal pressure embedded in a white or grey matter matrix material to demonstrate our *** matrix is described by an isotropic or anisotropic nonlinear elastic model.A representative unit cell(RUC)with blood vessels is built,which is used to generate the stress-strain data under different internal blood pressure and various proportional displacement loading *** generated stress-strain data is then used to train a mechanical law using artificial neural networks to predict the macroscopic mechanical response of brain tissue under different internal ***,the trained material model is implemented into finite element software to predict the mechanical behavior of a whole brain under intracranial pressure and distributed body *** with a direct numerical simulation that employs a reference material model,our proposed approach greatly reduces the computational cost and improves modeling *** predictions made by our trained model demonstrate sufficient ***,we find that the level of internal blood pressur

关键词： Data driven Constitutive law Anisotropy Brain tissue internal pressure

Ferritin and mortality in hemodialysis patients with COViD-19:A systematic review and meta-analysis

在线全文

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2024年第1期17卷 4-11页

作者： Ni Wayan Anantika Riani i Gde Raka Widiana Yenny Kandarini Nephrology Division Department of Internal MedicineUdayana University/Udayana University HospitalBaliIndonesia Nephrology Division Department of Internal MedicineUdayana University/Prof.Dr.I.G.N.G.Ngoerah General HospitalBaliIndonesia

Objective:To investigate the difference in serum ferritin levels between deceased and surviving regular hemodialysis patients with ***:We conducted a systematic search across four databases following the PRiSMA statement *** reporting ferritin levels and mortality of regular hemodialysis patients with COViD-19 were *** the random-effects model,we performed a meta-analysis to determine the mean difference in serum ferritin levels between the studied groups,along with their corresponding 95%confidence *** meta-analysis was carried out using Review Manager 5.4 and Stata ***:A total of 1013 patients from seven studies were included in this *** meta-analysis showed higher mean serum ferritin in the deceased compared to surviving regular hemodialysis patients with COViD-19,with a mean difference of 449.43 ng/mL[95%Ci(244.07,654.80),Pi2=58%,P=0.003].Conclusions:Our study found a higher mean of serum ferritin levels in the deceased compared to surviving regular hemodialysis patients with COViD-19.

关键词： Ferritin Mortality Hemodialysis COViD-19 inflammation