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Field measurement and numerical simulation of snow deposition on an embankment in snowdrift
Wenyong Ma,Feiqiang Li,Yuanchun Sun,Jianglong Li,Xuanyi Zhou 한국풍공학회 2021 Wind and Structures, An International Journal (WAS Vol.32 No.5
Snow accumulation on the road frequently induces a big traffic problem in the cold snowy region. Accurate prediction on snow distribution is fundamental for solving drifting snow disasters on roads. The present study adopts the transient method to simulate the wind-induced snow distribution on embankment based on the mixture multiphase model and dynamic mesh technique. The simulation and field measurement are compared to confirm the applicability of the simulation. Furthermore, the process of snow accumulation is revealed. The effects of friction velocity and snow concentration on snow accumulation are analyzed to clarify its mechanism. The results show that the simulation agrees well with the field measurement in trends. Moreover, the snow accumulation on the embankment can be approximately divided into three stages with time, the snow firstly deposited on the windward side, then, accumulation occurs on the leeward side which induced by the wake vortex, finally, the snow distribution reaches an equilibrium state with the slope of approximately 7°. The friction velocity and duration have a significant influence on the snow accumulation, and the vortex scale directly affected the snow deposition range on the embankment leeward side.
( Wenyong Ding ),( Houli Zhang ),( Yuefei Xu ),( Li Ma ),( Wenli Zhang ) 한국미생물생명공학회(구 한국산업미생물학회) 2019 Journal of microbiology and biotechnology Vol.29 No.8
Mycobacterium tuberculosis, a causative pathogen of tuberculosis (TB), still threatens human health worldwide. To find a novel drug to eradicate this pathogen, we tested taurine-5- bromosalicylaldehyde Schiff base (TBSSB) as an innovative anti-mycobacterial drug using Mycobacterium smegmatis as a surrogate model for M. tuberculosis. We investigated the antimicrobial activity of TBSSB against M. smegmatis by plotting growth curves, examined the effect of TBSSB on biofilm formation, observed morphological changes by scanning electron microscopy and transmission electron microscopy, and detected differentially expressed proteins using two-dimensional gel electrophoresis coupled with mass spectrometry. TBSSB inhibited mycobacterial growth and biofilm formation, altered cell ultrastructure and intracellular content, and inhibited cell division. Furthermore, M. smegmatis adapted itself to TBSSB inhibition by regulating the metabolic pathways and enzymatic activities of the identified proteins. NDMA-dependent methanol dehydrogenase, NAD(P)H nitroreductase, and amidohydrolase AmiB1 appear to be pivotal factors to regulate the M. smegmatis survival under TBSSB. Our dataset reinforced the idea that Schiff base-taurine compounds have the potential to be developed as novel anti-mycobacterial drugs.
Electronic Transport in Molecular Self-Assembled Monolayer Devices
Wenyong Wang,Takhee Lee,Reed, M.A. IEEE 2005 Proceedings of the Institute of Electrical and Ele Vol.93 No.10
<P>A review on the mechanisms and characterization methods of electronic transport through self-assembled monolayers (SAMs) is presented. Using SAMs of alkanethiols in a nanometer-scale-device structure, tunneling is unambiguously demonstrated as the main intrinsic conduction mechanism for defect-free large bandgap SAMs, exhibiting well-known temperature and length dependencies. In-elastic electron tunneling spectroscopy exhibits clear vibrational modes of the molecules in the device, presenting direct evidence of the presence of molecules in the device.</P>
Electron tunnelling in self-assembled monolayers
Wang, Wenyong,Lee, Takhee,Reed, Mark A The Institute of Physics 2005 Reports on progress in physics Vol.68 No.3
<P>A review on the mechanisms and characterization methods of electronic transport through self-assembled monolayers (SAMs) is presented. Using SAMs of alkanethiols in a nanometre scale device structure, tunnelling is unambiguously demonstrated as the main intrinsic conduction mechanism for defect-free large bandgap SAMs, exhibiting well-known temperature and length dependences. Inelastic electron tunnelling spectroscopy exhibits clear vibrational modes of the molecules in the device, presenting direct evidence of the presence of molecules in the device.</P>
Research on Cutting Force and Cutting Vibration in Milling of PE WPC
Shi Wenyong,Ma Yan,Yang Chunmei 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.10
This paper presents the impact of the change of cutting parameters on cutting force and cutting vibration by the milling experiment of PE WPC. In the text, 60% wood flour content and 70% wood flour content WPC are compared in up milling and down milling. The result shows that cutting force shows a progressive increasing trend as the feed speed increasing. The cutting force in up milling is totally smaller than in down milling with the change of cutting speed. Cutting force shows an increasing trend with the cutting width increasing. The impact of feed speed on cutting vibration is more obvious. The cutting vibration of 60% wood flour content is more susceptible than 70% wood flour content. In the cutting speed experiment, the cutting vibration in up milling is obviously bigger than in down milling. The cutting vibration of 60% and 70% wood flour content is almost the same in down milling. However, it is opposite in up milling. The cutting vibration shows a progressive increasing trend in down milling and steady in up milling as the cutting width increases.
Experimental Evaluation on Shape and Control of Chip in Milling of PE WPC
Shi Wenyong,Ma Yan,Wu Zhe,Yang Chunmei 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.7
This paper the regular patterns of chip flow, chip curler radius and thickness under different cutting parameters when processing PE WPC with different wood flour contents under the condition of up milling and down milling. Compared with up milling, down milling has greater impact on chip flow direction and cutting speed. However, there are more dust-shaped chips in the up milling. In the down milling, chip curler has less change with cutting parameters. Only when the feed speed is 14m/min or the cutting speed is 1800m/min, the chip curl radius is larger. The chip thickness increases when the feed speed or the cutting width increases and decreases when the cutting speed increases.
Cross-platform characterization of electron tunneling in molecular self-assembled monolayers
이탁희,Wenyong Wang,J. J. Zhang,J. Su, J,F. Klemic,M. A. Ree 한국물리학회 2005 Current Applied Physics Vol.5 No.3
Electron tunneling is investigated for the alkanethiol self-assembled monolayers (SAMs) formed using three dierent devicestructures spanning from the nanometer to the micrometer scale. The measured currentvoltage characteristics for the alkanethiolSAMs can be explained by the classical metalinsulatormetal tunneling model and the tunneling current exhibits overall expo-nential trend on the molecular length. Although dierent structures give consistent results (such as decay coecient), unambiguousdetermination of the tunneling requires characterization of length and temperature dependencies..
Dun Wu,Wenyong Zhang 한국지질과학협의회 2019 Geosciences Journal Vol.23 No.6
This paper reports systematically the redox sensitive elements (Mo, V, Cd, Cr, U and Th) and carbon and oxygen isotope data of the Late Carboniferous Taiyuan Formation limestone in the Huainan Coalfield in the southern margin of North China Platform, combined with the observation of limestone slice, and tries to explain the sedimentary environment of each layer of limestone. Through the analysis of the diagenesis of each layer of limestone, except for L7 and L12 limestone, the lithogenesis change of the remaining limestone becomes weak, which generally reflects the geochemical characteristics of the paleosol during sedimentation. There are three negative shifts of δ13C in Taiyuan Formation limestone, which may be related to the enrichment of redox sensitive elements (Cd, Cr, Mo and V) in limestone. In addition, the value of the above redox sensitive elements shows a negative drift. Combining the low V/Cr ratio and high Th/U ratio, it can be concluded that limestone of the Taiyuan Formation is likely to be deposited under an oxidizing condition.