Weiguo Wang

Chinese Academy of Sciences

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Haiyang Li

Southeast University

Lei Hua

Guizhou University

Chuang Chen

Dalian Institute of Chemical Physics

Keyong Hou

Shandong University

Vijay Tallapragada

National Oceanic and Atmospheric Administration

Bin Liu

Zunyi Normal College

Avichal Mehra

University of Pittsburgh

Lin Zhu

Qingdao National Laboratory for Marine Science and Technology

Qinghua Zhou

Zhejiang University of Technology

Chuang Chen

Wuhan University

Cooperative Institutions

Chinese Academy of Sciences

242

University of Chinese Academy of Sciences

107

Dalian Institute of Chemical Physics

National Oceanic and Atmospheric Administration

NOAA National Centers for Environmental Prediction

NOAA Environmental Modeling Center

Dalian University of Technology

Zhejiang University

Yunnan University

Peking University

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Development of Unidirectional Negative Corona Discharge Ion Mobility Spectrometer for Detection of Explosives

Fenxi Huaxue (2016)

Jiwei Liu Liying Peng Huang Wei Weiguo Wang Dandan Jiang

Ion mobility spectrometry (IMS) based explosives detectors is wieldy deployed at the check points of airport, etc, so the development of new ionization method to replace the radioactive Ni-63 ion source in IMS is highly demanded. In this study, a novel negative corona discharge was developed for ion mobility spectrometer for rapid detection of trace explosives, which was running in the unidirectional mode to efficiently remove nitrogen oxides and ozone produced from the discharge process. The diameter of target electrode was 3 mm, the distance between the needle and the target electrode was 2 mm, the discharge voltage was 2400 V and the flow rate of drift gas was 1200 mL/min. Under the optimized conditions, the dominant reactant ions was O-2(H2O)(n) and could be used to directly detect the common explosives, such as trinitrotoluene (TNT), ammonium nitrate (AN), nitroglycerin (NG), pentaerythritol tetranitrate (PETN) and hexahydro. 1,3,5-trinitro. 1,3,5-triazine (RDX). The limit of detection of TNT was 200 pg/mu L. These results indicated that negative corona discharge ionization source, with the advantanges of the high sensibility, simple structure and no radioactivity, could be used as a potential and promising ionization source for ion mobility spectrometry to detect explosives.

Pentaerythritol tetranitrate

Ion-mobility spectrometry

Trinitrotoluene

Electric arc

10.11895/j.issn.0253.3820.160038

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Diffusion Coefficient of Helium in Mo-Assessed by the Internal Friction Technique

Plasma Science and Technology (2009)

Weiguo Wang Yang Junfeng Wang Xian-ping Xie Chunyi Renhong Li

Diffusion behavior of helium in molybdenum was investigated by means of the internal friction method. An apparent relaxation internal friction peak associated with helium long-range diffusion was observed around 475 K at a resonant frequency of 56 Hz. In terms of the Gorsky relaxation model and the shift of the peak position with the measurement frequency, the activation energy and pre-exponential factor of the diffusion coefficient of the helium atoms in molybdenum were deduced as 0.63 eV and 6.5 cm2/s, respectively.

Internal friction

10.1088/1009-0630/11/3/02

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Updates in the NCEP GFS Cumulus Convection Schemes with Scale and Aerosol Awareness

Weather and Forecasting (2017)

Jongil Han Weiguo Wang Young Cheol Kwon Song‐You Hong Vijay Tallapragada

Abstract The current operational NCEP Global Forecast System (GFS) cumulus convection schemes are updated with a scale-aware parameterization where the cloud mass flux decreases with increasing grid resolution. The ratio of advective time to convective turnover time is also taken into account for the scale-aware parameterization. In addition, the present deep cumulus convection closure using the quasi-equilibrium assumption is no longer used for grid sizes smaller than a threshold value. For the shallow cumulus convection scheme, the cloud-base mass flux is modified to be given by a function of mean updraft velocity. A simple aerosol-aware parameterization where rain conversion in the convective updraft is modified by aerosol number concentration is also included in the update. Along with the scale- and aerosol-aware parameterizations, more changes are made to the schemes. The cloud-base mass-flux computation in the deep convection scheme is modified to use convective turnover time as the convective adjustment time scale. The rain conversion rate is modified to decrease with decreasing air temperature above the freezing level. Convective inhibition in the subcloud layer is used as an additional trigger condition. Convective cloudiness is enhanced by considering suspended cloud condensate in the updraft. The lateral entrainment in the deep convection scheme is also enhanced to more strongly suppress convection in a drier environment. The updated NCEP GFS cumulus convection schemes display significant improvements especially in the summertime continental U.S. precipitation forecasts.

Convective inhibition

Entrainment (biomusicology)

Free convective layer

Mass flux

Cloud base

10.1175/waf-d-17-0046.1

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Citations (138)

Internal Friction on the Lithium Ion Conductor Li_5La_3Ta_2O_(12)

Weiguo Wang

An investigation was made regarding the variation in internal friction and relative modulus with Li_5La_3Ta_2O_(12) compound by means of force vibration.Two apparent relaxation internal friction peaks were observed.By fitting the data with two Debye peaks,the activation energy and pre-exponential factor of the peaks are deduced as 0.8-1.1 eV and 10~(-14)-10~(-26) s,respectively, which indicates the occurrence of mutual interaction between the relaxation species(lithium vacancies).By fitting the data with the coupling model,the activation energy is deduced as 0.6-0.7 eV,close to the activation energy of lithium ion conductivity.Considering the crystal structure of Li_5La_3Ta_2O_(12) compound,these two peaks are associated with the lithium ion diffusion between adjacent 48g24d sites and 48g48g sites,respectively.The peaks gradually shift toward higher temperature and increase in both height and activation energy when the sample is aged at room temperature in air.Combined with the change of sample's mass,XRD and TGA,it can be concluded that the protons from the moisture substitute the lithium ions initially occupied the 48g sites in Li_5La_3Ta_2O_(12) compound to form Li_2O and new protonic derivatives,Li_(5-x)La_3Ta_2O_(12-x)(OH)_x(0x≤(2.15).)

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Fabrication of porous anode-support for planar solid oxide fuel cell using fish oil as a pore former

International Journal of Hydrogen Energy (2016)

Yejian Xue Wanbing Guan Changrong He Jianxin Wang Wu Liu

10.1016/j.ijhydene.2016.03.186

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Citations (19)

Water Vapor from Western Eurasia Promotes Precipitation during the Snow Season in Northern Xinjiang, a Typical Arid Region in Central Asia

Water (2020)

Weiguo Wang Hongyi Li Jian Wang Xiaohua Hao

Atmospheric water vapor plays an important role in the water cycle, especially in arid Central Asia, where precipitation is invaluable to water resources. Understanding and quantifying the relationship between water vapor source regions and precipitation is a key problem in water resource research in typical arid Central Asia, Northern Xinjiang. However, the relationship between precipitation and water vapor sources is still unclear of snow season. This paper aimed at studying the role of water vapor source supply in the Northern Xinjiang precipitation trend, which was investigated using the Hybrid Single Particle Lagrangian Integrated Trajectory (HYSPLIT) model. The results showed that the total water vapor contributed from Western Eurasia and the North Polar area presented upward trends similar to the precipitation change trend, which indicated that the water vapor contribution from the two previous water vapor source regions supplied abundant water vapor and maintained the upward precipitation trend from 1980 to 2017 in Northern Xinjiang. From the climatology of water vapor transport, the region was controlled by midlatitude westerlies and major water vapor input from the western boundary, and the net water vapor flux of this region also showed an annual increasing trend. Western Eurasia had the largest moisture percentage contribution to Northern Xinjiang (48.11%) over the past 38 years. Northern Xinjiang precipitation was correlated with water vapor from Western Eurasia, the North Polar area, and Siberia, and the correlation coefficients were 0.66, 0.45, and 0.57, respectively. These results could aid in better understanding the water cycle process and climate change in this typical arid region of Central Asia.

Water cycle

HYSPLIT

Middle latitudes

10.3390/w12010141

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Citations (17)

ベーリング海の北部の懸濁物含有量分布及びその粒子の成分特徴を【JST・京大機械翻訳】

Haiyang xuebao (2016)

Zhao Mengwei Weiguo Wang Fang Jianyong Wu Chengqiang Wu Risheng

Source

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Ionization of Dichloromethane by a Vacuum Ultraviolet Krypton Lamp: Competition Between Photoinduced Ion-Pair and Photodissociation-Assisted Photoionization

The Journal of Physical Chemistry Letters (2023)

Yi Yu Jichun Jiang Lei Hua Chuang Chen Yiqian Xu

The photodissociation and photoionization behaviors of haloalkanes in the VUV regime are important to fully understand the mechanism of ozone depletion in the stratosphere. The ionization of dichloromethane (CH2Cl2) under the irradiation of 10.0 and 10.6 eV light was investigated. CH2Cl+ was observed at 10 Pa, while both CH2Cl+ and CHCl2+ were observed at higher pressure. The production efficiency of CH2Cl+ decreased with the increasing number density of CH2Cl2, while that of CHCl2+ increased. A kinetic model was successfully derived to quantitatively describe the variation trends of CH2Cl+ and CHCl2+, in which the competition between photoinduced ion-pair and photodissociation-assisted photoionization (PD-PI) were included. The ion-pair channel was quenched efficiently at higher pressure or concentration, which reduced its contribution. Our study proposed new insights into the complicated photoexcitation behaviors of CH2Cl2 in the VUV regime and revealed the important role of photodissociation in photoionization at low photon flux.

Photoexcitation

Dichloromethane

10.1021/acs.jpclett.2c03572

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Citations (6)

Erratum to: Analytically Modelling Mean Wind and Stress Profiles in Canopies

Boundary-Layer Meteorology (2014)

Weiguo Wang

Wind Stress

10.1007/s10546-014-9932-4

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Real-time continuous measurement of intraoperative trace exhaled propofol by planar differential mobility spectrometry

Analytical Methods (2021)

Yang Li Dandan Jiang Kun Zhao Enyou Li Yiping Liu

In order to study anesthetic pharmacokinetics and adequately adjust the anaesthesia depth of patients, real-time measurement of the intraoperative exhaled propofol concentration is of significant importance for anaesthetists.

TRACE (psycholinguistics)

Exhaled air

Ion-mobility spectrometry

Breath gas analysis

10.1039/d1ay00179e

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Citations (3)