检索结果-南通市图书馆

Room temperature growth of CsPbbr_(3)single crystal for asymmetric MSM structure photodetector

中华中医药学会中药分析分会第三届学术交流会

作者： Li Yang~a Yun wang~a longxing wang~b Hongbin Xiao~b Zhengtao wang~(a*) Zhibi Hu~a a Key Laboratory of Standardization of Chinese Medicines of Ministry of Education Shanghai University of Traditional Chinese Medicine 1200 Cailun Road Zhangjiang Hi-tech Park Shanghai 201203 China b Dalian Institute of Chemical Physics Chinese Academy of Sciences 457 Zhongshan Road Dalian 116023 China

Longdan Xiegan Decoction(LXD) is a formulated preparation composed of ten ingredient herbs,with iridoids as one group of the main bioactive *** this study,a rapid,simple and reliable meth

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2024年第20期187卷 113-122页

作者： longxing Su International School of Microelectronics Dongguan University of TechnologyDongguan 523808China

UV-visible broadband light harvesting ability is critical for photodetectors,and all inorganic perovskite CsPbbr_(3)is regarded as a promising candidate as the response active ***,a saturated-solution crystallization method is employed to synthesize CsPbbr_(3)single ***-dependent photo-luminescence spectra with one-photon and two-photon excitation are systematically investigated,deter-mining a large exciton binding energy of 39.8 *** allows the stable excitonic emission of CsPbbr_(3)single crystal at room ***,an asymmetric structure CsPbbr_(3)photodetector is fab-ricated by using InGa alloy as the Ohmic electrode and Au as the Schottky ***-8 V,the device exhibits a prominent response to the irradiation from UV to green band with a maximum responsiv-ity of 2.56 A/W,an external quantum efficiency of 580%,and a detectivity of 1.24×10^(13) Hz1/2 W−*** addition,the CsPbbr_(3)photodetector also presents rapid response speeds at both reverse and forward bias voltages and self-powered characteristics owing to the Schottky depletion layer underneath the Au *** demonstration of asymmetric metal-semiconductor-metal(MSM)structure photodetector presents a promising pathway toward next-generation CsPbbr_(3)optoelectronic devices.

关键词： Room temperature CsPbbr_(3) Single crystal Asymmetric Photodetector

Multiresidue determination and potential risks of emerging pesticides in aquatic products from Northeast China by LC-MS/MS

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

Journal of Environmental Sciences 2018年第1期30卷 116-125页

作者： Lei Fu Xianbo Lu Jun Tan longxing wang Jiping Chen CAS Key Laboratory of Separation Science for Analytical Chemistry Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Belling 100049China

A simple method for determining 33 pesticides with a wide polarity range（log Kow0.6-4.5） in aquatic products was developed based on LC–MS/MS. The target analytes included three types of widely used pesticides： insecticides, fungicides and herbicides. based on the optimization of ultrasonic assisted extraction and GPC clean-up procedures, the matrix effect, extraction recoveries and LOD were improved distinctively. LOQ of this method was below 0.5 ng/g for all pesticides, which is superior to values in the literature, and the matrix effect was reduced effectively（-14.7% to 7.5%）. The method was successfully applied to investigate the pesticide residue levels of twenty-five samples including seven common kinds of fishes from Northeast China. The results showed that all targeted pesticides were present in the fish samples; however, their levels were low, except for atrazine, linuron,ethoprophos, tetrachlorvinphos, acetochlor and fenthion. Atrazine and linuron caught our attention because the concentrations of atrazine in fish samples from Liaoning province were in the range of 0.5-8 ng/g（w/w） with mean concentration of 2.3 ng/g, which were far above those of other pesticides. The levels of linuron were in the range of 0.6-6 ng/g（mean concentration 2.8 ng/g）, which were the highest among all targeted pesticides in the Inner Mongolia. This is the first systematic investigation on the characteristics and levels of these pesticides in aquatic products from northeast China. Considering their toxicity and bioaccumulation, the potential risk of atrazine and linuron from consuming aquatic products should be paid more attention.

关键词： Pesticide residues Aquatic products LC-MS/MS Northeast China

Asymmetric flow effect in a horizontal natural ventilated tunnel with different aspect ratios under the influence of longitudinal fire locations

在线全文

学校读者我要写书评

暂无评论

building Simulation 2021年第4期14卷 1311-1323页

作者： longxing Yu Huaxian Wan Jie Ji State Key Laboratory of Fire Science University of Science and Technology of ChinaJinZhai Road 96HefeiAnhui230026China College of Environment and Resources Fuzhou UniversityXueyuan Road 2FuzhouFujian350116China

This paper has analyzed the asymmetric flow effect of fire-induced thermal flow in a horizontal tunnel under the natural ventilation condition by conducting large eddy simulations (LES). The key objective is to reveal and to have a better understanding of the asymmetric flow effect caused by the upstream and downstream tunnel length difference. The mechanism behind it can be explained based on the conservation of mass and dynamic force analysis on the smoke and fresh air. The strength of the asymmetric flow effect is characterized by the mass flow rate of the induced longitudinal flow (net mass flow rate of a cross-section). An empirical correlation to predict the induced longitudinal mass flow rate is proposed. Furthermore, the law of smoke and air flow distribution within a horizontal tunnel is established. The proportion of smoke (or air) flowing out (or coming in) through the opening increase (or decrease) linearly with the increasing distance between that opening to the fire location. The variation of the air flow with the longitudinal fire location in a tunnel is more sensitive than the smoke flow. Results have shown that as the fire approaches the tunnel exit from the middle of the tunnel, the smoke spilling out through this opening is reduced from 50% to 40%, while the fresh air incoming from this opening is increased from 50% to 100% and vice versa.

关键词： asymmetric flow effect fire location thermal flow smoke tunnel fire CFD

Monitoring gas-and particulate-phase short-chain polychlorinated paraffins in the urban air of Dalian by a self-developed passive sampler

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

Journal of Environmental Sciences 2019年第6期31卷 287-295页

作者： Yifan wang Xiuhua Zhu Yuan Gao Hao bai Pengyuan wang Jiping Chen Heping Yuan longxing wang Xiaoxiao Li Wei wang School of Environmental and Chemical Engineering Dalian Jiaotong University Dalian Institute of Chemical Physics Chinese Academy of Sciences College of Chemistry Jilin University Dalian Meteorological Observatory

The concentration of short-chain polychlorinated paraffins(SCCPs) in the urban air of Dalian,China was monitored from September 2016 to August 2017 with a self-developed passive sampler(PAS1) and an active high-volume sampler, simultaneously. PAS1 successfully collected the entire target SCCPs in the ambient air. Air SCCPs sampled by PAS1 were found be in the linear uptake stage during 181 days of sampling. Passive and active samples showed comparable congener profiles, and the dominant contributors of SCCPs in the two kinds of samples were similar. A significant linear correlation was observed between the total concentration of SCCPs sampled by PAS1 and active sampler in the four seasons. The passive sampling rates of the PAS1 for the gas and particulate phases of SCCPs were measured. The quantitative structure–property relationship of the sampling rate of PAS1(Rair) for gas-phase SCCPs was studied. From the molecular point of view, Rairwas mainly affected by the molecular weight and sub-cooled liquid vapor pressure of SCCPs. In general, SCCPs in the urban air of Dalian mainly existed in gas phase,lower molecular weight SCCPs primarily occurred in the gas phase, whereas higher molecular weight SCCPs were predominately adsorbed or absorbed on airborne particles. The air concentration of SCCPs in the four seasons were different, the correlation of the concentration of SCCPs in the air with the meteorology parameters was conducted. The exposure risk by intake air SCCPs of the residents around the sampling sites was evaluated according to the European risk assessment standards.

关键词： Ambient air Short-chain polychlorinated paraf fins Passive sampler Active sampling Passive sampling

THE DELAYED bARbOUR＇S MODEL FOR SCHISTOSOMIASIS

在线全文

学校读者我要写书评

暂无评论

International Journal of biomathematics 2012年第2期5卷 117-137页

作者： longxing QI JING-AN CUI School of Mathematical Sciences Anhui University Hefei 230601P.R.China College of Science beijing University of Civil Engineering and Architecture beijing 100044 P.R.China

The transmission of schistosomiasis involves latent periods of infected hosts. In this paper, considering the latent periods of infected human, infected bovines and infected snails, we propose a delayed barbour＇s model with two definitive hosts and define basic reproductive number. The stability of equilibria for the systems with and without time delays are both investigated. To study the impact of the latent periods on the transmission of schistosomiasis, some sensitivity analysis of the basic reproductive number on the three time delays are carried out. It is shown that the basic reproductive number decreases as the three time delays increase. Furthermore, the impact of the latent periods of infected snails on the system is stronger than that of the latent periods of infected human and infected bovines. Thus, to reduce the prevalence of schistosomiasis infection, prolonging the latent periods of infected snails by some measures could achieve better results than prolonging the latent periods of infected definitive hosts.

关键词： barbour's two-definitive-host model schistosomiasis basic reproductivenumber three time delays.

Switch type PANI/ZnO core-shell microwire heterojunction for UV photodetection

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

Journal of Materials Science & Technology 2022年第10期105卷 259-265页

作者： Yihan Chen longxing Su Mingming Jiang Xiaosheng Fang Department of Materials Science Fudan UniversityShanghai 200433China Department of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China College of Science Nanjing University of Aeronautics and AstronauticsNanjing 211106China

In this study,single crystal ZnO microwires(MW)with size of~5.4 mm×30μm are prepared through a chemical vapor deposition technique at high temperature(1200℃).Subsequently,p-type conducting polyaniline(PANI)polymers with different conductivities are densely coated on part of the ZnO MW to construct organic/inorganic core-shell heterojunction *** hetero-diodes reach an extremely high rectifcation ratio(I_(+3V)/I_(-3V))of 749230,and a maximum rejection ratio(I_(350nm)/I_(dark))of 3556(at-3 V),indicating great potential as rectifed *** the heterojunction devices exhibit strong response to ultraviolet(UV)radiation with high response ***,the obvious photovoltaic behavior can also be obtained,allowing the device to operate as an independent and stable unit without externally supplied *** 0 V bias voltage,the self-powered photodetector shows a maximum responsivity of 0.56 mA W~(-1)and a rapid response speed of 0.11 ms/1.45 ms(rise time/decay time).Finally,a fnite difference time domain(FDTD)simulation is performed to further demonstrate the interaction mechanism between the incident light feld and the hexagonal cavity,which strongly supports the enhancement of the light absorption in whispering-gallery-mode resonator.

关键词： Core-shell structure Heterojunction High rectifcation ratio Self-powered Photodetector

Clinical manifestations and gene mutation in a case of Machado-Joseph disease

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2012年第35期7卷 2842-2847页

作者： bin Zhang Liru Li longxing Chen Jie Huang Department of Neurology Branch Hospital in Fengxian of Sixth People's Hospital Shanghai Neurological Research Institute of Anhui University of Science & Technology the Affiliated Hospital of Anhui University of Science & Technology Department of Emergency Branch Hospital in Fengxian of Sixth People's Hospital Shanghai Neurological Research Institute of Anhui University of Science & Technology the Affiliated Hospital of Anhui University of Science & Technology Department of Radiology Branch Hospital in Fengxian of Sixth People's Hospital Shanghai Neurological Research Institute of Anhui University of Science & Technology the Affiliated Hospital of Anhui University of Science & Technology

This study reports a case of a 75-year-old female Machado-Joseph disease patient exhibiting unstable walking and inaccurate hand holding for 8 months, which progressively worsened. Physical examination on admission showed cerebellar ataxia and a history of hypertension. Crania MRI demonstrated cerebellar and brain stem atrophy. Gene analysis showed abnormal amplification of the CAG trinucleotide repeat in exon 10 of the ataxin-3 （ATXN3） gene, resulting in 70-81 CAG repeats in the patient, with a significant positive family history.

关键词： machado-Joseph disease clinical characteristics imaging molecular genetics spinocerebellarataxia-3 gene gene mutation exon 10 spinocerebellar ataxia nervous system disease

Adsorption behavior of CO_(2) in magnesite micro-pores at high temperature and pressure

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2021年第2期12卷 991-999页

作者： longxing Yang Lei Liu Hong Liu Li Yi Xiaoyu Gu Haibo Liu Hanyu wang United Laboratory of High-Pressure Physics and Earthquake Science Key Laboratory of Earthquake PredictionInstitute of Earthquake ForecastingCEABeijing100036China

The fluid inclusions in mantle rocks and melt indicated that a large amount of CO_(2)fluid exists in the deep earth,which is of great significance for understanding the deep carbon cycle and the composition of ***,it was also suggested that carbonate minerals were likely to be the main host of mantle *** the same time,the distribution and behavior of carbon in the mantle still remain a *** this paper,the adsorption behavior and occurrence characteristics of supercritical CO_(2)in magnesite(MgCO3)pores were studied by the Grand Canonical Monte Carlo method(GCMC)under the different conditions of CO_(2)pressures(0–100 MPa),temperatures(350–1500 K)and the pore sizes(7.5–30Å).The simulated results showed that the adsorption of CO_(2)in magnesite was a physical adsorption,which was mainly controlled by the intermolecular *** gas adsorption became more stable when the adsorption site shifted from the high energy site to the low energy site with increasing pressure(P)and decreasing temperature(T)and pore *** the same time,the variations of excess adsorption amounts of CO_(2)in the pores of magnesite(Nexcess)under the different conditions were quantitatively *** was found that the Nexcess decreased with increasing T,but increased with increasing P and pore *** results favor understanding the CO_(2)migration,seismic precursor observations,and heat transfer process in the deep earth.

关键词： CO_(2) Magnesite Adsorption Nexcess GCMC Carbon cycle

Hexabromocyclododecane and tetrabromobisphenol A in sediments and paddy soils from Liaohe River basin, China： Levels, distribution and mass inventory

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2016年第10期28卷 209-217页

作者： Fang Li Jing Jin Dongqin Tan longxing wang Ningbo Geng Rong Cao Yuan Gao Jiping Chen Key Laboratory of Separation Science for Analytical Chemistry Dalian Institute of Chemical PhysicsChinese Academy of SciencesNo.457 Zhongshan RoadDalian 116023China University of Chinese Academy of Sciences Beijing 100049China

Hexabromocyclododecane （HbCD） and tetrabromobisphenol A （TbbPA） are two kinds of brominated flame retardants and widely present in the environment and biota. The levels, spatial distributions and mass inventories of HbCD and TbbPA were investigated in sediments and paddy soils from the Liaohe River basin in northeast China. The concentrations of ∑HbCD and TbbPA were in the range of not detected （nd） to 4.02 ng/g dry weight （dw） and 0.03 to 4.06 ng/g dw, respectively, y-HbCD was dominated in sediments, while the abundance of a-HbCD was relatively high in paddy soils. The spatial distributions of HbCD and TbbPA in surface sediments and paddy soils indicated that the local point-input was their major source. The significant correlation between total organic carbon （TOC） contents and the HbCD levels suggested that TOC content also exerted an influence on the distribution of HbCD in sediments. Meanwhile, it was found that the irrigation with fiver water was not the major transportation pathway of HbCD and TbbPA in paddy soils. based on the study, it was estimated that there were about 1.67 tons HbCD and 2.20 tons TbbPA deposited into sediments of the Liaohe River system every year. The total mass inventories of HbCD and TbbPA in sediments were far higher than that in paddy soils.

关键词： Hexabromocyclododecane Tetrabromobisphenol ALevelDistributionMass inventoryLiaohe River basin