检索结果-南通市图书馆

Physical insights from imaginary-time density–density correlation functions

在线全文

学校读者我要写书评

暂无评论

Matter and radiation at Extremes 2023年第5期8卷 57-72页

作者： Tobias dornheim Zhandos A.Moldabekov Panagiotis Tolias Maximilian Böhme Jan Vorberger center for Advanced Systems Understanding(CASUS) D-02826 GörlitzGermany Helmholtz-Zentrum dresden-rossendorf(HZdr) D-01328 DresdenGermany Space and Plasma Physics Royal Institute of Technology(KTH)Stockholm SE-10044Sweden Technische Universität dresden D-01062 DresdenGermany

An accurate theoretical description of the dynamic properties of correlated quantum many-body systems,such as the dynamic structure factor S(q,ω),is important in many ***,highly accurate quantum Monte Carlo methods are usually restricted to the imaginary time domain,and the analytic continuation of the imaginary-time density–density correlation function F(q,τ)to real frequencies is a notoriously hard ***,it is argued that often no such analytic continuation is required because by definition,F(q,τ)contains the same physical information as does S(q,ω),only represented ***,it is shown how one can directly extract key information such as the temperature or quasi-particle excitation energies from theτdomain,which is highly relevant for equation-of-state measurements of matter under extreme conditions[*** et al.,***.13,7911(2022)].As a practical example,ab initio path-integral Monte Carlo results for the uniform electron gas(UEG)are considered,and it is shown that even nontrivial processes such as the roton feature of the UEG at low density[*** et al.,***.5,304(2022)]are manifested straightforwardly in F(q,τ).A comprehensive overview is given of various useful properties of F(q,τ)and how it relates to the usual dynamic structure *** fact,working directly in theτdomain is advantageous for many reasons and opens up multiple avenues for future applications.

关键词： imaginary continuation quantum

Image acquisition system for agricultural context-aware computing

在线全文

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2014年第4期7卷 75-80页

作者： Xiao Boxiang Wang Chuanyu Guo Xinyu Wu Sheng Beijing research center for Information Technology in Agriculture Beijing 100097China National Engineering research center for Information Technology in Agriculture Beijing 100097China

Context-aware computing is a new mode originated from ubiquitous *** emergence brings a substantial change to traditional computing and related *** is a pervasive tool for context awareness.A large number of applications are developed based on images *** this paper,an image acquisition system is presented for agricultural context-aware *** potential use of the system includes production evaluation,precise management and assistant *** system includes four modules:the camera system,the control system,mechanism,and *** system can be easily installed in target crop *** camera system is composed of a binocular stereo camera and a color *** cubic images and a corresponding texture image are collected for each plant in the process of data *** accessorial software system is developed to control and manage the capture *** show that the presented system is effective for image acquisition of agricultural context-aware computing.

关键词： image acquisition agriculture context-aware computing

Preparation and characterization of nicotine tartrate and its application in gum-based chewing tobacco

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

烟草科技 2018年第A1期51卷 47-56页

作者： YANG Ji ZHAO Yang YANG Liu ZHE Wei ZHU Baokun CHEN Yongkuan dU Qiaohong YANG Hongqin LI Hui r&d center of China Tobacco Yunnan Industrial Co. Ltd. No.367 Hongin Road Wuhua District Kunming 650023 China College of Chemical Engineering Sichuan University No.24 First South Section First Ring Road Wuhou District Chengdu 610066 China

To develop suitable nicotine derivatives for potential use in next generation tobacco products,mixtures of nicotine with tartaric acid were *** prepared freeze-dried product was a white powder with good water *** structure of nicotine tartrate was evaluated with X-ray powder diffraction,near infrared diffuse reflectance spectroscopy and solid-state Nuclear Magnetic resonance(ss-NMr).The crystal structure of nicotine tartrate was analyzed by single-crystal X-ray *** to the obtained atomic coordinates,equivalent temperature factor,bond length and torsion angles,the chemical formula of nicotine tartrate was proposed as 2(C4H5O6)· C10H16N2·*** relative molecular mass was 480.42,and the crystal density was 1.501 mg/m^3 The crystal structure of nicotine tartrate belongs to the orthorhombic system and the monoclinic space group is *** tartrate was used in gum-based chewing tobacco to substitute pure nicotine,which showed a sustained nicotine release when compared to traditional ultrafine tobacco powder as assessed by an in situ dissolution method.

关键词： Nicotine Nicotine tartrate Crystal structure Gum-based chewing tobacco In-vitro dissolution

SIMULATION OF INVENTOrY POLICY FOr PrOdUCT WITH PrICE ANd TIME-dEPENdENT dEMANd FOr dETErIOrATING ITEM

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 modeling, Simulation, and Scientific Computing 2012年第1期3卷 1-30页

作者： d.SHUKLA U.K.KHEdLEKAr r.P.S.CHANdEL S.BHAGWAT department of Mathematics and Statistics dr.Hari Singh Gour Central University Sagar M.P.India department of Mathematics and Computer Science model Science College Jabalpur M.P.India department of Business Management dr.Hari Singh Gour Central University Sagar M.P.India

In a declining market for goods,we optimize the net profit in business when inventory management allows change in the selling prices n times over time *** are computing optimal number of changes in prices,respective optimal prices,and optimal profit in each of the cycle for a deteriorating *** paper theoretically proves that for any business setup there exists an optimal number of price settings for obtaining maximum *** results are supported by numerical examples for different setups(data set)and it is found that for every setup the dynamic pricing policy out-performs the static pricing *** our model,the deterioration factor has been taken into *** deteriorated units are determined by the recurrence *** we studied the effect of different parameters on optimal policy with *** managerial purposes,we have provided some“suggested intervals”for choosing parameters depending upon initial demand,which help to predict the best prices and arrival of customers(demand).

关键词： dynamic pricing deterioration time-dependent price sensitive demand optimal policy optimal number of change in price

A live birth resulting from a fourth cesarean scar pregnancy after combined hysteroscopic and laparoscopic uterine repair: A case report and literature review

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Laparoscopic, Endoscopic and robotic Surgery 2024年第3期7卷 136-139页

作者： Jie Yang Jianmin Chen dong Huang Assisted reproduction Unit Department of Obstetrics and GynecologySir Run Run Shaw HospitalZhejiang University School of MedicineHangzhou 310016China Zhejiang Key Laboratory of Precise Protection and Promotion of Fertility Hangzhou 310016China Zhejiang Provincial Clinical research center for Obstetrics and Gynecology Hangzhou 310016China

Cesarean scar pregnancy(CSP)is a rare form of ectopic pregnancy that is defined as a pregnancy sac located within the scar of a previous cesarean *** cesarean scar pregnancy(rCSP)is even more uncommon,1 with Hasegawa et al reporting the first rCSP in 2005.2 rCSP is a high-risk pregnancy condition with potential complications that include heavy bleeding,uterine rupture,and maternal *** exact incidence rates for CSP and rCSP are unknown,although the incidence of CSP is 1/2656–1/1800 of the total number of cesarean sections,and the incidence of rCSP can reach 6.9%–34.3%.3,4,5 With the promulgation of the second and third child policies in China,an increasing number of patients now manifest fertility needs after cesarean *** improvements in examination methods and awareness of CSP,we also suspect that the rates of CSP and rCSP may be even ***,there is no standard treatment for *** herein report a case in which the patient was treated by combined hysteroscopic and laparoscopic uterine repair without scar resection during the third rCSP,and the fourth rCSP occurred 6 months later;the patient then selected expectant *** outcome was a successful cesarean section delivery of a live baby at 34 weeks of gestation,and the uterus was successfully *** pathology was examined after delivery and revealed that the chorionic villi penetrated deeply into the myometrium.

关键词： pregnancy cesarean repair

An A-d-A′-d-A type unfused nonfullerene acceptor for organic solar cells with approaching 14%efficiency

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 Chemistry 2021年第2期64卷 228-231页

作者： Xingzheng Liu Yanan Wei Xin Zhang Linqing Qin Zhixiang Wei Hui Huang College of Materials Science and Opto-Electronic Technology Center of Materials Science and Optoelectronics EngineeringCAS Center for Excellence in Topological Quantum ComputationCAS Key Laboratory of Vacuum PhysicUniversity of Chinese Academy of SciencesBeijing 100049China CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China

In recent years,power conversion efficiency(PCE)of organic solar cells(OSCs)has made significant improvement.A large number of studies were reported to achieve high PCEs through exploring new active layer materials,especially the high efficiency fused ring acceptors(FrAs).Compared with FrAs,another type of so-called unfused-ring acceptors(UFAs),possessing some advantages such as simple synthesis and low cost,have attracted a lot of ***,a new UFA BTzO-4F,incorporating with a benzotriazole moiety and S···O intramolecular noncovalent interactions,has been successfully *** photovoltaic device based on PBdB-T:BTzO-4F achieved a record PCE of 13.8%for UFAs,which indicates that introducing the benzotriazole moiety is an effective strategy for high quality ***,these findings of this work demonstrate the great potential of UFAs for high performance OSCs.

关键词： organic solar cells unfused nonfullerene acceptor benzotriazole moiety

A daily Temperature dataset over China and Its Application in Validating a rCM Simulation

在线全文

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2009年第4期26卷 763-772页

作者：徐影高学杰沈艳许崇海石英 F.GIOrGI National Climate center China Meteorological Administration National Meteorological Information center China Meteorological Administration The Abdus Salam International Centre for Theoretical Physics

This paper describes the construction of a 0.5°× 0.5° daily temperature dataset for the period of 1961- 2005 over China's Mainland for the purpose of climate model validation. The dataset is based on the interpolation from 751 observing stations in China and comprises 3 variables： daily mean, minimum, and maximum temperature. The ＂anomaly approach＂ is applied in the interpolation. The gridded climatology of 1971-2000 is first calculated and then a gridded daily anomaly for 1961-2005 is added to the climatology to obtain the final dataset. Comparison of the dataset with CrU （Climatic research Unit） observations at the monthly scale shows general agreement between the two datasets. The differences found can be largely attributed to the introduction of observations at new stations. The dataset shows similar interannual variability as does CrU data over North China and eastern part of the Tibetan Plateau, but with a slightly larger linear trend. The dataset is employed to validate the simulation of three extreme indices based on daily mean, minimum, and maximum temperature by a high-resolution regional climate model. results show that the model reproduces these indices well. The data are available at the National Climate center of China Meteorological Administration, and a coarser resolution （1°× 1°） version can be accessed via the World Wide Web.

关键词： interpolation temperature regional climate model China

Structural and magnetic properties of La_(0.7)Sr_(0.3)MnO_(3) ferromagnetic thin film grown on PMN-PT by sol-gel method

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced dielectrics 2017年第4期7卷 47-50页

作者： Jing Zhang Peng Shi Mingmin Zhu Ming Liu Wei ren Zuoguang Ye Electronic Materials research Laboratory Key Laboratory of the Ministry of Education and International center for dielectric research Xi'an Jiaotong University Xi'an 710049P.R.China department of Chemistry and 4d LABS Simon Fraser University BurnabyBC V5A 1S6Canada

We report the preparation of epitaxial La_(0.7)Sr_(0.3)MnO_(3) thin films grown on(001)-oriented 0.72Pb(Mg_(1/3)Nb_(2/3))TO_(3)-0.28PbTiO_(3) substrates by the sol–gel *** phase structure,magnetic properties and magnetoresistance of the samples are investigated by using high solution X-ray diffraction,atomic force microscopy,physical property measurement system,*** La_(0.7)Sr_(0.3)MnO_(3) thin films display a well-defined hysteresis loop and typical ferromagnetism behavior at lower *** magnetoresistance at 5 T of 42%appears at 227K for La_(0.7)Sr_(0.3)MnO_(3) thin film.

关键词： La_(0.7)Sr_(0.3)MnO_(3)thin films PMN-PT sol-gel method magnetoresistance

Living Conditions and Palliative Care Needs among End-of-Life Former Commercial Plasma donors Affected with HIV/AIdS in rural Henan of China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 2010年第4期23卷 279-286页

作者： Yu SHENG ZE-QI QIU YUN HE NAOMI JUNIPEr YAN ZHANG School of Nursing Peking Union Medical College Beijing 100144 China center for disease Control and Prevention Zhengzhou 450016 Henan China National center for AIdS/STd Control and Prevention Chinese Center for disease Control and Prevention Beijing 102206 China

Objective China began providing antiretroviral therapy to people living with HIV/AIdS （PLWHA） in 2003. This study was to investigate the living conditions, including quality of life and happiness, and need for palliative care of end-of-life PLWHA in rural Henan. Methods One hundred end-of-life AIdS patients were selected from Weishi, Zhenping and Tanghe counties in Henan, using convenience sampling. The World Health Organization Quality of Life for HIV （WHOQOL-HIV） BrEF Chinese Version was used to measure the quality of life and the Memorial University of Newfoundland Scale of Happiness （MUNSH） was employed to measure subjective welfare. Qualitative interviews and focus group discussions were undertaken to learn about the palliative care provided and the specific needs of the end-of-life patients. results Patients’ overall quality of life was moderate （12.62±1.97）. Highest scores were in the spirituality/religion/personal beliefs, higher than the average scores in the Chinese population （P0.01）, while psychological （13.58±2.06） and environment （12.50±3.28） domain scores were similar to the latter （P0.05）. Both independence （12.15±2.15） and physiological （14.04±3.16） domain scores were lower than the average of the people living with HIV/AIdS in other studies （P0.01）; however, all were in the moderate range. The average MUNSH score was 21.00±6.20, which was also moderate. The in-depth interviews indicated that the Henan Provincial Government’s policy of treatment and care had a beneficial impact on end-of-life AIdS patients, although the care components could be improved. Conclusions Living conditions of the end-of-life AIdS patients were moderate, and the HIV/AIdS palliative care model used was beneficial to them. Care could be improved by assisting the family unit as a whole.

关键词： Living conditions People living with HIV/ AIdS PLWHA End-of-life China Plasma donors