检索结果-南通市图书馆

Revisiting Laser-Intensity-Dependent Ionization and Fragmentation of C60

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2021年第8期38卷 32-37页

作者： D.P.Dong b.H.Yang D.b.Qian W.C.Zhou S.F.Zhang X.Ma Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China

We revisit the laser-intensity-dependent ionization and fragmentation yields of C60 molecules irradiated by 25-fs,798-nm laser pulses based on the approach in which photoions are measured via a velocity map imaging spectrometer working in a time-sliced *** approach dramatically improves the signal-to-background ratio compared to those using a simple(traditional)time-of-flight mode(spectrometer),and thus allows us to measure the laser-intensity dependences down to a previously untouched region,which is expected to provide new insights into the intense-field ionization and fragmentation of ***,we find that the saturation intensities for C60 ionizations and the onset intensity for C60 fragmentation are much lower than those reported in previous ***,the derived saturation-intensity dependence on charge distribution demonstrates the validity of the over-the-barrier ionization using a conducting sphere model.

关键词： fragmentation saturation ionization

A NUMERICAL MEtHOD FOR SOLVING tHE EVOLUtION EQUAtION OF SOLItARY ROSSbY WAVES ON A WEAK SHEAR

在线全文

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 1987年第1期4卷 43-54页

作者：伊增欣 t.Warn beijing Canada Department of Meteorology McGill University National Research Center for Marine Environment Forecasts State Oceanic Administration

In this paper an evoluion equation in integral-differential form for finite amplitude Rossby waves on a weak shear is presented and an efficient method for its numerical solution is set up. It is shown that a propagation of solitary wave is possible whenever a proper weak shear in basic flows acts with the nonlinear effects and dispersion of the media, both in the atmosphere and in the ocean. to test the numerical method for solving the evolution equation, a series of experiments are carried out. the results indicate that the solitary solutions, do exist and interact with each other in quite a succinct, manner. therefore the method is successful and efficient for solving initial value problems of the above equation. the time decoupling problem arising in the numerical scheme and the related filtering technique are discussed. A variety of interesting phenomena such as the interaction of solitary Rossby waves, damping, dispersion and the development of nonlinear wave train are numerically studied.

关键词： A NUMERICAL MEtHOD FOR SOLVING tHE EVOLUtION EQUAtION OF SOLItARY ROSSbY WAVES ON A WEAK SHEAR

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

国际统计学概要

国际统计学概要

Accident of Large-scale Wind turbines Disconnecting from Power Grid and Its Protection

作者： t.b.·里亚布什金 b.M.·西姆切拉

来源：南通市图书馆图书评论

学校读者我要写书评

暂无评论

电力系统自动化 2012年第8期36卷 105-109页

作者： Dong, X.Z. Shi, S.X. Wang, b. bak, D.J. Cao, R.b. Ren, L. Lan, L. He, S.E. State Key Lab. of Power Systems Department of Electrical Engineering Tsinghua University Beijing 100084 China Wind Power technology Center Gansu Electric Power Corporation Lanzhou 730050 China

there were many accidents of large-scale wind turbines disconnecting from power grid in *** singlephase-to-ground fault cannot be correctly detected,single-phase-to-ground fault evolved to phase-to-phase ***-to-phase fault was isolated slowly,thus leading to low *** wind turbines without enough low voltage ride-through capacity had to be disconnected from the *** some wind turbines being disconnected from the grid,overvoltage caused by reactive power surplus made more wind turbines disconnect from the *** on the accident analysis,this paper presents solutions to above problems,including travelling waves based single-phase-to-ground protection,adaptive low voltage protection,integrated protection and control,and high impedance fault *** solutions lay foundations in theory and technology to prevent large-scale wind turbines disconnecting from the operating power grid.

关键词：大型风力发电机组低电压保护电网事故断开单相接地故障风力涡轮机故障检测切断电源

Parkinson’s Disease Classification Using Random Forest Kerb Feature Selection

在线全文

学校读者我要写书评

暂无评论

Intelligent Automation & Soft Computing 2023年第5期36卷 1417-1433页

作者： E.bharath t.Rajagopalan Department of Computer Science and Engineering University College of EngineeringVillupuramKakupppam605103India Department of Science and Humanities University of College of EngineeringAriyalurKavanur621705India

Parkinson’s disease(PD)is a neurodegenerative disease cause by a deﬁciency of *** have identiﬁed the voice as the underlying symptom of *** vocal disorder studies provide adequate treatment and support for accurate PD *** learning(ML)models have recently helped to solve problems in the classiﬁcation of chronic *** work aims to analyze the effect of selecting features on ML efﬁciency on a voice-based PD detection *** includes PD classiﬁcation models of Random forest,decision tree,neural network,logistic regression and support vector *** feature selection is made by RF mean-decrease in accuracy and mean-decrease in Gini *** forest kerb feature selection(RFKFS)selects only 17 features from 754 *** proposed technique uses validation metrics to assess the performance of ML *** results of the RF model with feature selection performed well among all other models with high accuracy score of 96.56%and a precision of 88.02%,a sensitivity of 98.26%,a speciﬁcity of 96.06%.the respective validation score has an Non polynomial vector(NPV)of 99.47%,a Geometric Mean(GM)of 97.15%,a Youden’s index(YI)of 94.32%,and a Matthews’s correlation method(MCC)90.84%.the proposed model is also more robust than other *** was also realised that using the RFKFS approach in the PD results in an effective and high-performing medical classiﬁer.

关键词： Parkinson’s disease machine learning healthcare random forest feature selection classiﬁcation

Coping with trauma:the Relationship between Religiosity,Spirituality,and Post-traumatic Symptoms among Civilians Exposed to Ongoing Rocket-Fire

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Mental Health Promotion 2023年第10期25卷 1137-1145页

作者： Jonathan t.Wolkinson Michael Weinberg Faculty of Welfare and Health Sciences University of HaifaHaifa31905Israel

Living under ongoing shelling and missile attacks could cause a widespread of disruption of everyday life and emotional *** with such distress could be associated with the personal resources of religion and *** present study aimed to examine the relationships between religiosity and spirituality with Post traumatic stress Disorder(PtSD)symptoms among a civilian population frequently exposed to missile and rocket *** hundred and twenty-four(N=124)civilian participants living within 10 km from shelling and missile attacks fired towards them,completed demographic,religiosity,spirituality,and PtSD *** study findings demonstrate that religiosity is associated with higher levels of PtSD symptoms while spirituality is associated with lower levels of PtSD *** dividing the sample into two groupsreligious and secular,no association was found between religiosity and PtSD symptoms among the religious group,whereas among the secular group,there was a positive *** was negatively associated with PtSD symptoms among both *** study may offer a significant contribution to models of intervention following continued exposure to trauma,emphasizing the importance of spiritually and sensitivity to religion while coping with PtSD *** and practical implications are discussed.

关键词： trauma coping religiosity spirituality ongoing rocket-fire

Anticlockwise metamorphic paths at ca.890–790 Ma from the NE baidrag block,Mongolia,indicate back-arc compression at the Rodinia periphery

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geoscience Frontiers 2023年第2期14卷 154-181页

作者： PavlaŠtípská Vít Peresty Igor Soejono Karel Schulmann RCAndrew Kylander-Clark Carmen Aguilar Stephen Collett Martin Racek Jitka Míková Otgonbaatar Dorjsuren Nikol Novotná Czech Geological Survey 11821 Praha 1Czech Republic Institute of Petrology and Structural Geology Charles University in PragueAlbertov 6Praha 212800Czech Republic Institut terre et Environnement de Strasbourg UMR 7063 Universitéde Strasbourg-CNRS1 Rue Blessig67084 StrasbourgCedexFrance Department of Earth Science University of CaliforniaSanta BarbaraCA 93106United States Department of Mineralogy Petrology and Applied GeologyFaculty of Earth ScienceUniversity of Barcelona08028 BarcelonaSpain Institute of Geology Mongolian Academy of SciencesLabor Union StreetSonginokhairkhan DistrictUlaanbaatar 18080Mongolia

the processes leading to the assembly of the Rodinia supercontinent through Grenvillian collisional orogeny are relatively well *** contrast,accretionary orogenic processes occurring at the supercontinent periphery following Rodinia assembly are poorly *** fill this gap,we have identified metamorphic rocks in the Mongolia collage of the Central Asian Orogenic belt,where numerous data testify for Meso-to Neoproterozoic magmatic *** tectono-metamorphic evolution of the periSiberian tract of the Central Asian Orogenic belt is mainly characterized by the late Proterozoic–early Cambrian(baikalian)***,we document here a tonian age metamorphism at the northern part of the Precambrian baidrag block,previously considered as a typical example of the baikalian metamorphic *** study incorporates zircon and in-situ monazite geochronology linked to P-t modelling of Grt-Sil-Ky migmatite gneiss and Grt-St ***-Sil-Ky gneiss records initial burial to the sillimanite stability field at 720℃ and 6.0 kbar followed by further burial to the kyanite stability field at 750℃ and 9 kbar and decompression to 650℃ and 8 *** Grt-St schist records initial burial to the staurolite stability field at 620℃ and 6 kbar,followed by further burial to 590℃ and 8.5 *** monazite data yield a continuum of ^(207)Pb-corrected ^(238)U/^(206)Pb dates of ca.926–768 Ma in the Grt-Sil-Ky gneiss,and ca.937–754 Ma in the Grt-St *** on monazite textural positon,internal zoning,and REE patterns,the time of prograde burial to 6.0 kbar under a thermal gradient of 27–32℃/km is estimated at ca.890–853 *** is not clear whether such high-grade conditions prevailed until a phase of further burial under a geothermal gradient of 18–22℃/km dated at ca.835–815 *** late monazite recrystallization at ca.790 Ma is related to ***,monazite with dates of ca.568–515 Ma occur as whole grains or as rims with sharp boundaries on tonian monaz

关键词： Central Asian Orogenic belt Grenvillian-age metamorphism Monazite in-situ U-Pb dating Monazite REE composition Zircon U-Pb dating thermodynamic modelling

Skeletal muscle mechanisms contributing to improved glycemic control following intense interval exercise and training

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

运动医学与健康科学(英文) 2023年第1期5卷 20-28页

作者： Hashim Islam Jenna b.Gillen School of Health and Exercise Sciences Faculty of Health and Social DevelopmentUniversity of British Columbia OkanaganKelownaBCCanada Faculty of Kinesiology and Physical Education University of TorontoTorontoONCanada

High-intensity and sprint interval training(HIIt and SIt,respectively)enhance insulin sensitivity and glycemic control in both healthy adults and those with cardiometabolic *** beneficial effects of intense interval training on glycemic control include both improvements seen in the hours to days following a single session of HIIt/SIt and those which accrue with chronic *** muscle is the largest site of insulin-stimulated glucose uptake and plays an integral role in the beneficial effects of exercise on glycemic *** we summarize the skeletal muscle responses that contribute to improved glycemic control during and following a single session of interval exercise and evaluate the relationship between skeletal muscle remodelling and improved insulin sensitivity following HIIt/SIt training *** evidence suggests that targeting skeletal muscle mechanisms via nutritional interventions around exercise,particularly with carbohydrate manipulation,can enhance the acute glycemic benefits of *** is also some evidence of sex-based differences in the glycemic benefits of intense interval exercise,with blunted responses observed after training in females relative to *** in skeletal muscle metabolism between males and females may contribute to sex differences in insulin sensitivity following HIIt/SIt,but well-controlled studies evaluating purported muscle mechanisms alongside measurement of insulin sensitivity are *** the greater representation of males in muscle physiology literature,there is also a need for more research involving female-only cohorts to enhance our basic understanding of how intense interval training influences muscle insulin sensitivity in females across the lifespan.

关键词： HIIt Insulin sensitivity type 2 diabetes Nutrition Sex differences

SOME REFINEMENtS OF ENEStROM-KAKEYA tHEOREM

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Analysis in theory and Applications 2007年第2期23卷 129-137页

作者： A. Aziz b. A. Zargar University of Kashmir (J & K Kashmir)

In this paper we present certain interesting refinements of a well-known Enestrom- Kakeya theorem in the theory of distribution of zeros of polynomials which among other things also improve upon some results of Aziz a... 详细信息

关键词： polynomial modulius of zeros Enestrom-Kakeya theorem