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Effects of slip length and hydraulic diameter on hydraulic entrance length of microchannels with superhydrophobic surfaces

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Frontiers in Energy 2020年第1期14卷 127-138页

作者： Wenchi GONG Jun SHEN Wei DAI zeng deng Xueqiang DONG Maoqiong GONG Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China

This paper investigated effects of slip length and hydraulic diameter on the hydraulic entrance length of laminar flow in superhydrophobic *** investigations were performed for square microchannels with Re ranging between 0.1 and *** is found that superhydrophobic microchannels have a longer hydraulic entrance length than that of conventional ones by nearly 26.62%at a low *** dimensionless hydraulic entrance length slightly increases with the increasing slip length at approximately Re<10,and does not vary with the hydraulic diameter.A new correlation to predict the entrance length in square microchannels with different slip lengths was developed,which has a satisfying predictive performance with a mean absolute relative deviation of 5.69%.The results not only ascertain the flow characteristics of superhydrophobic microchannels,but also suggest that super hydrophobic microchannels have more significant advantages for heat transfer enhancement at a low Re.

关键词： laminar flow hydraulic entrance length super hydrophobic surface slip length hydraulic diameter

Data Quality Control Method of a New Drifting Observation Technology Named Drifting Air-Sea Interface Buoy

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Journal of Ocean University of China 2024年第1期23卷 11-22页

作者： LI Shuo WANG Bin deng zeng’an WU Baoqin ZHU Xiande CHEN Zhaohui National Ocean Technology Center Tianjin 300112China School of Marine Science and Technology Tianjin UniversityTianjin 300072China Key Laboratory of Ocean Observation Technology Ministry of Natural ResourcesTianjin 300112China People’s Liberation Army 92859 Tianjin 300061China Physical Oceanography Laboratory Ocean University of ChinaQingdao 266100China

An integral quality control(QC)procedure that integrates various QC methods and considers the design indexes and operational status of the instruments for the observations of drifting air-sea interface buoy was developed in the order of basic in-spection followed by targeted *** innovative method of combining a moving Hampel filter and local anomaly detection com-plies with statistical laws and physical processes,which guarantees the QC performance of meteorological *** sets of observation data were used to verify the applicability and effectiveness of the QC procedure,and the effect was evaluated using the observations of the Kuroshio Extension Observatory buoy as the *** results showed that the outliers in the time series can be correctly identified and processed,and the quality of data improved *** linear correlation between the quality-controlled observations and the reference increased,and the difference *** correlation coefficient of wind speed before and after QC increased from 0.77 to 0.82,and the maximum absolute error decreased by approximately 2.8ms^(-1).In addition,air pressure and relative humidity were optimized by 10^(-3)–10^(-2) orders of *** the sea surface temperature,the weight of coefficients of the continuity test algorithm was optimized based on the sea area of data acquisition,which effectively expanded the applicability of the algorithm.

关键词： drifting air-sea interface buoy quality control oceanic variables meteorological variables continuity test

The diapycnal mixing in the upper Pacific estimated from GTSPP observations

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Acta Oceanologica Sinica 2016年第1期35卷 46-52页

作者： deng zeng'an WEI Guanghao YU Ting WEI Hongyu KANG Linchong HAN Luyao School of Marine Science and Technology Tianjin University Tianjin 300172 China National Marine Data and Information Service Tianjin 300171 China

Diapycnal mixing （DM） in the upper 600 m of the Pacific Ocean was estimated based on the huge amount of the observations from Global Temperature-Salinity Profile Programme （GTSPP）, using the strain version of the finescale parameterization. It is found that DM in each season exhibits similar distribution pattern, but differs in details. The intensification of DM is related to bottom roughness, surface near-inertial energy, and proximity to the equator. The intensified DM caused by rough topography shows in the profiles near the Mendocino fracture zone in the northeast Pacific, and the heightened DM caused by wind-generated near-inertial energy appears in the westerly region of the Southern Ocean. As compared to previous estimates, the DM estimate in this work has better spatial coverage and finer resolution, and more importantly it contains the seasonal variability, Furthermore, the resulting DM dataset is gridded, rendering it suitable for modeling applications.

关键词： diapycnal mixing GTSPP fine-scale parameterization Pacific

An operational radar current observing and data service platform in the East China Sea

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Acta Oceanologica Sinica 2016年第11期35卷 9-15页

作者： deng zeng'an ZHANG Anmin ZHAI Jingsheng YU Ting WU Shuangquan ZHANG Xuefeng KANG Linchong ZHANG Yuming School of Marine Science and Technology Tianjin UniversityTianjin 300072China National Marine Data and Information Service State Oceanic AdministrationTianjin 300171China National Marine Environmental Monitoring Center State Oceanic AdministrationDalian 116023China

An ocean state monitor and analysis radar（OSMAR）, developed by Wuhan University in China, have been mounted at six stations along the coasts of East China Sea（ECS） to measure velocities（currents, waves and winds） at the sea surface. Radar-observed surface current is taken as an example to illustrate the operational high-frequency（HF） radar observing and data service platform（OP）, presenting an operational flow from data observing, transmitting, processing, visualizing, to end-user service. Three layers（systems）： radar observing system（ROS）, data service system（DSS） and visualization service system（VSS）, as well as the data flow within the platform are introduced. Surface velocities observed at stations are synthesized at the radar data receiving and preprocessing center of the ROS, and transmitted to the DSS, in which the data processing and quality control（QC） are conducted. Users are allowed to browse the processed data on the portal of the DSS, and access to those data files. The VSS aims to better show the data products by displaying the information on a visual globe. By utilizing the OP, the surface currents in East China Sea are monitored, and hourly and seasonal variabilities of them are investigated.

关键词： radar operational system currents data service visualization

FORECAST OF WATER TEMPERATURE IN RESERVOIR BASED ON ANALYTICAL SOLUTION

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Journal of Hydrodynamics 2008年第4期20卷 507-513页

作者： JI Shun-wen ZHU Yue-ming QIANG Sheng zeng deng-feng College of Water Conservancy and Hydroelectric Engineering Hohai University Nanjing 210098 China Water Power Plant of Sanhe Shangyoujiang Ganzhou 341212 China

The water temperature in reservoirs is difficult to be predicted by numerical simulations. In this article, a statistical model of forecasting the water temperature was proposed. In this model, the 3-D thermal conduction-diffusion equations were converted into a system consisting of 2-D equations with the Fourier expansion and some hypotheses. Then the statistical model of forecasting the water temperature was developed based on the analytical solution to the 2-D thermal equations. The~ simplified statistical model can elucidate the main physical mechanism of the temperature variation much more clearly than the numerical simulation with the Navier-Stokes equations. Finally, with the presented statistical model, the distribution of water temperature in the Shangyoujiang reservoir was determined.

关键词： water temperature quasi 3-D statistical model thermal conduction-diffusion equation analytical solution regression analysis factor of radiation

Effects of wind waves of the Pacific westerly on the eastern Pacific wave transport

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Acta Oceanologica Sinica 2009年第1期28卷 83-88页

作者： deng zeng＇ an WU Kejian ZHAO Dongliang YU Ting Physical Oceanography Laboratory Ocean University of China Qingdao Shandong 266100 China Marine Earth ＆ Atmospheric Sciences North Carolina State University Raleigh NC 27695 USA

There exists a tongue-shaped swell-dominance pool known as Swell Pool（SP） in the Eastern Pacific *** monthly-mean wave transports（WT） for each month of 2000 is computed using the wave products of ECMWF reanalysis *** comparing the 2000 monthly-mean WT and monthly-mean wind field from QUICKSCAT,large differences are found between the wave transport direction and the wind direction over the Eastern *** may serve as an evidence for the existence of the SP in this *** work done in this study indicates that the sources of swell in the Tropical Eastern Pacific（TEP） are in the westerly regions of the Southern and Northern Pacific.

关键词： swell pool wave transport Eastern Pacific Westerly

Cells in G2/M phase increased in human nasopharyngeal carcinoma cell line by EBV-LMP1 through activation of NF-кB and AP-1

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Cell Research 2003年第3期13卷 187-194页

作者： LIN deng,JING YANG,XIAO RONG ZHAO,XI YUN deng,LIANG zeng,HUAN HUA GU,MIN TANG,YA CAOCancer Research Institute,Xiangya School of Medicine,Central South University,Xiangya Road 88,Chang-sha,Hunan 410078,China Cancer Research Institute Xiangya School of Medicine Central South University Changsha China

Although previous studies showed that the principal oncoprotein encoded by Epstein-Barr virus, latentmembrane protein 1 （LMP1） 5 could induce the nasopharyngeal carcinoma cells in G2/M phase increased, littleis known about the target molecules and mechanisms. The present study demonstrated that LMP1 couldinduce the accumulation of p53 protein and upregulate its transactivity in a dose dependent manner, whichresulted in the decrease of the kinase activity of cdc2/cyclin B complex and inducing arrest at G2/M phasethrough the activation of NF-κB and AP-1 signaling pathways, and the effect of NF-κB was more obviousthan that of AP-1. This study provided some significant evidence for further elucidating the molecularmechanisms that LMP1 had effects on the surveillance mechanism of cell cycle and promoting the survivalof transformed cells and tumorigenesis.

关键词： LMP1 nasopharyngeal carcinoma p53 G2/M

COMPOSITION AND SPECTROSCOPIC STUDIES OF HYDRATED SODIUM ALUMINATE COMPOUNDS

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Acta Metallurgica Sinica(English Letters) 1996年第3期9卷 177-180页

作者： QIU Guofang, deng Hongmei, zeng Wenming and CHEN Hianyi(Shanghai Institute of Metallurgy, Chinese Academy of Sciences, Shanghai 200050, China)

XRD, IR, NMR and a 'tracer method' are used to investigate two hydrated sodium aluminates. It has been found that the compositions of these two compounds are 4Na2O-Al2O-3-12H2O and Na2O-Al2O3-2.5H2O, respecttvely. The... 详细信息

关键词： sodium aluminate hydrate composition spectroscopic study

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黑潮大弯曲时期日本鲭幼体输运数值模拟研究

海洋通报 2023年第2期42卷 138-150页

作者：白玉邓增安天津大学海洋科学与技术学院天津300072

日本鲭是一种重要的经济鱼类,广泛分布于西北太平洋沿岸海域,其资源和补充很容易受到环境因素的影响,尤其是在鱼类的早期生活阶段,即卵和幼体阶段。本文建立了一个基于个体的模型(Individual-Based Model,IBM)用以研究典型大弯曲期间黑... 详细信息

日本鲭是一种重要的经济鱼类,广泛分布于西北太平洋沿岸海域,其资源和补充很容易受到环境因素的影响,尤其是在鱼类的早期生活阶段,即卵和幼体阶段。本文建立了一个基于个体的模型(Individual-Based Model,IBM)用以研究典型大弯曲期间黑潮主流、周围环流以及中尺度涡对日本鲭早期生命活动的影响。数值模拟及研究结果表明:(1)在深度分布方面,大部分个体(鱼卵或仔稚鱼)位于75 m以浅水层中,只有少部分被垂直湍流带入更深的水域。(2)在产卵场和育幼场之间的连通性方面,3-5月来自主要产卵场的个体随黑潮主流进入黑潮延伸区的渔场;6月份,主要产卵场中的个体受到黑潮大弯曲东侧的小型冷涡的影响,该冷涡阻止了其进入黑潮延伸区的渔场,并留在纪伊半岛和伊豆群岛的沿海水域。在昼夜垂直迁移(Diel Vertical Migration,DVM)这一输运方式的影响下,停留在四国岛和纪伊半岛附近的个体数量增加,处于DVM输运方式下的个体受冷涡的影响更大,增加了在海洋表面漂流的时间,无法跟随黑潮主流输送到更远的育幼场。(3)在输送距离方面,90%以内的个体进行短距离到中距离输运,在DVM输运方式下,长距离输运的个体明显较少。本文通过数值模拟获得了鱼类早期阶段资源分布的时空位置,可为保护鱼卵和鱼类幼体提供理论指导,以便能够更加有效地研究其资源潜力。

关键词：日本鲭幼体输运黑潮典型大弯曲