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Obtaining accurate measurements of the sea surface height from a GPS buoy

Acta Oceanologica Sinica 2023年第6期42卷 78-88页

作者： Wanlin Zhai Jianhua Zhu Chuntao Chen Wu Zhou Longhao Yan Yufei Zhang Xiaoqi Huang Kai Guo National Ocean technology Center Tianjin 300112China school of Ocean Yantai UniversityYantai 266004China National Satellite Ocean Application Service Beijing 100081China

A dedicated GPS buoy is designed for calibration and validation(Cal/Val)of satellite altimeters since *** order to evaluate the accuracy of the sea surface height(SSH)measured by the GPS buoy,twelve campaigns have been done within China sea area between 2014 and *** six of these campaigns,two static Global Navigation Satellite System stations were installed at distances of<1 km and 19 km from the buoy to assess how the baseline length influenced the derived SSH from the buoy *** GPS buoy data was processed using the GAMIT/GLOBK software+TRACK module and CSRS-PPP tool to achieve the *** SSH was compared with conventionally tide gauge(TG)data to evaluate the accuracy of the buoy with the standard deviation of the height *** results showed that the difference in the standard deviation of the SSH from the buoy and the TG was less than 16 *** SSHs processed with different ephemeris(Ultra-Rapid,Rapid,Final)were not significantly *** the baseline length was 19 km,the SSH solution of the GPS buoy performed well,with standard bias of less than 26 mm between the heights measured by the buoy and TG,meaning that the buoy could be used for Cal/Val of *** bias between the Canadian Spatial Reference System-precise point positioning tool and the TRACK varied a lot,and some of them were over 130 *** deemed too high to be useful for Cal/Val of satellite ***,the GPS buoy solutions processed by GAMIT/GLOBK software+TRACK module were used for in-orbit Cal/Val of HY-2B/C satellites in ten *** SSH and significant wave height of the altimeters showed good agreements with the GPS buoy solutions.

关键词： GPS buoy sea surface height baseline length precise point positioning satellite altimeter HY-2

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CoP nanoparticles embedded in P and N co-doped carbon as efficient bifunctional electrocatalyst for water splitting

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Journal of Energy Chemistry 2017年第6期26卷 1223-1230页

作者： Zeqi Zhou Nasir Mahmood Yongchao Zhang Lun Pan Li Wang Xiangwen Zhang Ji-Jun Zou Key Laboratory for Green Chemical technology of the Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Collaborative Innovative Center of Chemical Science and Engineering(tianjin) Tianjin 300072China

Noble-metal-free hydrogen/oxygen evolution reaction(HER/OER) electrocatalysts, especially bifunctional electrocatalysts, are essential for overall water splitting, but their performance is impeded by many factors like poor electrical conductivity. Herein, we fabricated cobalt phosphide(Co P) nanoparticles embedded in P and N co-doped carbon(PNC) matrix(Co P@PNC) to fully realize the high activity of Co P by maximizing its conductivity. Simply a carbonization coupled phosphidation approach was utilized where Co ions and organic ligands of Co-MOF were transferred into Co P and P and N co-doped carbon. The synthesized material shows an ideal electrical conductivity, excellent HER(overpotential of-84 m V and-120 m V @10 m A cmin acidic and alkaline medias, respectively) and OER(overpotential of 330 m V@10 m A cmin alkaline media) performances. Further, Co P@PNC acts as a superior catalyst for both anode and cathode to catalyze overall water splitting and only requires an voltage of 1.52 V to deliver a current density of 10 m A cm, superior to the noble-metal catalysts system(Pt/C//IrO) and the reported noble-metal-free bifunctional electrocatalysts.

关键词： Cobalt phosphide Electrocatalyst Hydrogen evolution reaction Oxygen evolution reaction Water splitting

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Donor‐acceptor carbon nitride with electron‐withdrawing chlorine group to promote exciton dissociation

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Chinese Journal of Catalysis 2021年第7期42卷 1168-1175页

作者： Jing‐Wen Zhang Lun Pan Xiangwen Zhang Chengxiang Shi Ji‐Jun Zou Key Laboratory for Green Chemical technology of the Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Collaborative Innovative Center of Chemical Science and Engineering(tianjin) Tianjin 300072China

Carbon nitride(C_(3)N_(4))is promising for photocatalytic hydrogen production,but photogenerated electrons and holes in C_(3)N_(4)usually tend to exist as excitons due to intrinsic Coulomb interactions making its photocatalytic activity ***,a well‐designed intramolecular C_(3)N_(4)‐based donor‐acceptor(D‐A)photocatalytic system was constructed to promote exciton *** to its good chemical compatibility with melamine and appropriate sublimation property,2‐amino‐4,6‐dichloropyrimidine unit was chosen as the monomer to react with melamine to construct intramolecular D‐A system(CNCl_(x)).The hydrogen evolution rate of CNCl_(0.15)is 15.3 times higher than that of bulk C_(3)N_(4)under visible light irradiation,with apparent quantum efficiency of 13.6%at 420 *** enhanced activity is attributed to introduced electron‐withdrawing−Cl group as terminal group in the resulted CNCl_(x) samples,which can build internal electric field to promote the exciton dissociation into free electron and *** addition,lower work function value of CNCl_(x) samples indicates that internal electric field can help free electrons and holes transfer to the surface of CNCl_(x) samples for photocatalytic reaction.

关键词： Carbon nitride Donor‐acceptor Internal electric field Exciton Hydrogen production

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The impact of the novel starch-lipid complexes on the glucolipids metabolism， inflammation， and gut dysbiosis of Type 2 diabetes mellitus rats

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Food Science and Human Wellness 2023年

作者： Yingshuang Lu Renbing Qin Jin Wang Fengjuan Xiang Yan Zhang Bowei Zhang Dancai Fan Huan Lv Xuemeng Ji Shujun Wang Shuo Wang State Key Laboratory of Food Nutrition and Safety， tianjin university of Science & technology school of Food Science， Henan Institute of Science and technology tianjin Key Laboratory of Food Science and Health， school of Medicine， Nankai university

It has been widely accepted that resistant starch (RS) provides numerous health benefits for human. In this research， we aimed at evaluating the performance of novel starch-lipid complexes， RS5， in comparison with RS2 on physical features， glucolipids metabolism， inflammation， and gut microbiota profiles of Type 2 diabetes mellitus (T2DM) rats. The T2DM model was established by streptozotocin injection to the high-fat-sugar fed rats. According to a serial of biochemical analyses， we found that RS5 diets were strongly correlated with enhanced homeostatic model assessment for insulin secretion (HOMA-IS)， high-density lipoprotein cholesterol (HDL-C)， adiponectin (ADP)， insulin action index (IAI)， glucagon-like peptide-1 (GLP1)， and short-chain fatty acids (SCFAs) in T2DM rats whilst negatively associated with the low-density lipoprotein (LDL-C) and inflammatory cytokines， showing the capabilities to ameliorate T2DM symptoms by regulation of glucolipid metabolism， gut metabolites， and inflammation. On the other hand， RS2-enriched supplementations were influential in the mediation of insulin secretion to improve glucose metabolism. The increasing evidence collected herein suggested that intestinal microbiota could mediate glucolipids metabolism and alleviate inflammation after certain microflora nourished by RS. In addition， RS intake made an impact on PI3K/AKT signaling pathway that might contribute to the improvement of glucose metabolism， insulin resistance， and inflammatory responses.

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Modulation of magnetic and electrical properties of bilayer graphene quantum dots using rotational stacking faults

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Chinese Physics B 2019年第7期28卷 504-510页

作者： Hong-Ping Yang Wen-Juan Yuan Jun Luo Jing Zhu National Center for Electron Microscopy in Beijing School of Materials Science and Engineering the State Key Laboratory of New Ceramics and Fine Processing Key Laboratory of Advanced Materials(MOE) Tsinghua University Beijing 100084 China Center for Electron Microscopy Institute for New Energy Materials & Low-Carbon Technologies School of Materials Science and Engineering Tianjin University of Technology Tianjin 300384 China

Bilayer graphene quantum dots with rotational stacking faults(RSFs) having different rotational angles were *** the first-principles calculation, we determined that these stacking faults could quantitatively modulate the magnetism and the distribution of spin and energy levels in the electronic structures of the *** addition, by examining the spatial distribution of unpaired spins and Bader charge analysis, we found that the main source of magnetic moment originated from the edge atoms of the quantum *** research results can potentially provide a new path for producing all-carbon nanodevices with different electrical and magnetic properties.

关键词： bilayer graphene quantum dots rotational stacking faults first-principles calculation

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Effect of Ethylene on Polygalacturonase,Lipoxygenase and Expansin in Ripening of Tomato Fruits

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Transactions of tianjin university 2009年第3期15卷 173-177页

作者：薛照辉寇晓虹罗云波朱本忠许文涛 school of Agriculture and Biological Engineering Tianjin University Zhongyi Animal and Science technology Ltd. College of Food Science and Nutritional Engineering China Agricultural University

Fruit ripening is a complex process and is regulated by many factors. Ethylene and polygalacturonase （PG）, lipoxygenase （LOX）, expansin （EXP） are all critical regulating factors in fruit ripening and softening process. With antisense ACS tomato, Nr mutant tomato and cultivated tomato as materials, Northern blot hybridization showed that PG, LeEXP1 and LOXexpressed differently in different parts of cultivated tomato fruit during ripening, which was related to fruit ripening. The ripening process of columella and radial pericarp was faster than pericarp. In both Nr mutant and antisense ACS transgenic tomato fruit, expression levels ofPG, LeEXPI and LOXwere generally lower than those in cultivated fruit but still related to fruit ripening. The expression levels ofPG, LeEXP1 and LOX increased in the mature green tomato fruits after 0.5 h treatment with ethylene （100 μL/L）. These results indicate that gene expression ofPG, LeEXP1 and LOXwere positively regulated by ethylene. The time and cumulative effect of the concentration exists in the expression of PG regulated by ethylene. The regulation of LOX expression mainly depended on the fruit development after great amount of ethylene was produced. PG played a major role in ripening and softening of tomato fruit, and cooperated with the regulation of EXP and LOX.

关键词： tomato ripening and softening ethylene expansin lipoxygenase polygalacturonase gene expression

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An Anonymous Authentication Scheme with Controllable Linkability for Vehicle Sensor Networks

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Computer Modeling in Engineering & Sciences 2020年第12期125卷 1101-1118页

作者： Yousheng Zhou Lvjun Chen Xiaofeng Zhao Zheng Yang College of Computer Science and technology Chongqing University of Posts and TelecommunicationsChongqing400065China school of Cyber Scurity and Information law Chongqing University of Posts and TelecommunicationsChongqing400065China Singapore university of technology and Design 8 Somapah Rd487372Singapore

Vehicle sensor networks(VSN)play an increasingly important part in smart city,due to the interconnectivity of the *** similar to other wireless communications,vehicle sensor networks are susceptible to a broad range of *** addition to ensuring security for both data-at-rest and data-in-transit,it is essential to preserve the privacy of data and users in vehicle sensor *** existing authentication schemes for vehicle sensor networks are generally not designed to also preserve the privacy between the user and service provider(e.g.,mining user data to provide personalized services without infringing on user privacy).Controllable linkability can be used to facilitate an involved entity with the right linking key to determine whether two messages were generated by the same sender,while preserving the anonymity of the *** a functionality is very useful to provide personalized ***,in this paper,a threshold authentication scheme with anonymity and controllable linkability for vehicle sensor networks is constructed,and its security is analyzed under the random oracle model.

关键词： Threshold authentication controllable linkabilty group signature vehicle sensor networks

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In-situ Synthesis of SnO2 Quantum Dots/ZnS Nanosheets Heterojunction as a Visible-light-driven Photocatalyst for Degradation of Rhodamine B,Potassium Dichromate and Tetracycline

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Journal of Wuhan university of technology(Materials Science) 2020年第4期35卷 719-725页

作者： ZHANG Chenxu WU Xiangfeng JIA Yunning CHANG Tianlong LIU Zhifeng FU Yunxuan LIU Xutao WANG Hui SHI Yimai ZUO Yuqian school of Materials Science and Engineering Hebei Provincial Key Laboratory of Traffic Engineering MaterialsShijiazhuang Tiedao UniversityShijiazhuang 050043China tianjin Key Laboratory of Building Green Functional Materials Tianjin Chengjian UniversityTianjin 300384China

The SnO2 quantum dots(SnO2QDs)/ZnS nanosheets(ZnSNs)heterojunction was fabricated via an in-situ synthetic method at room *** B,potassium dichromate,and tetracycline were used to discuss the photocatalytic activities of the as-prepared samples under the visible light *** photocatalytic mechanism of the as-prepared samples was also *** experimental results indicate that the degradation efficiency of the as-prepared SnO2QDs/ZnSNs heterojunction first increases and then decreases with increasing the usage of *** the mass ratio of SnO2QDs to ZnSNs is 1:2 in 180 min,the as-prepared samples have the highest degradation efficiency of 89.1%for rhodamine B,97.7%for potassium dichromate,and 83.8%for tetracycline,which are much higher than 51.7%,26.8%,and 0.9%of pure SnO2QDs as well as 37.9%,87.1%,and 19.1%of pure ZnSNs,*** it is repeatedly degraded for 3 times,it possesses the degradation efficiency of 62.5%for rhodamine B,which increases by 200.5%in comparison with 20.8%of the pure ***,the enhanced photocatalytic performances of the as-prepared hybrids are attributed to the formation of heterojunction between the SnO2QDs and *** addition,hydroxyl radicals and superoxide anion radicals play major roles during the photocatalytic degradation process,while holes play a minor role.

关键词： ZnS nanosheets SnO2 quantum dots photocatalysis

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Coupled Seepage and Heat Transfer Intake Model

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Transactions of tianjin university 2009年第6期15卷 446-451页

作者：吴君华由世俊张欢李海山 school of Environmental Science and Engineering Tianjin University College of Architecture Engineering and Mechanics Yanshan University

In the beach well intake system, heat is transferred from soil to fluid when seawater is filtered through the aquifer, providing higher temperature source water to the seawater source heat pump (SWHP) system in winter. A 3-D coupled seepage and heat transfer model for studying beach well intake system is established by adopting the computer code FLUENT. Numerical results of this model are compared with the experimental results under the same conditions. Based on the experiment-verified coupled model, numerical simulation of the supply water tem-perature is studied over a heating season. Results show that the minimum temperature of supply water is 275.2 K when this intake system continuously provides seawater with flow rate of 35 m3/h to SWHP. Results also indicate that the supply water temperature is higher than seawater, and that the minimum temperature of supply water lags behind seawater, ensuring effective and reliable operation of SWHP.

关键词： seawater source heat pump renewable energy seawater intake beach well

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Analysis of the Thermal Behavior of a Lithium Cell Undergoing Thermal Runaway

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Fluid Dynamics & Materials Processing 2021年第5期17卷 887-898页

作者： Qifei Du Zhigang Fang National Demonstration Center for Experimental Engineering Training Education Tiangong UniversityTianjin300387China school of Automotive Engineering Wuhan University of TechnologyWuhanChina Hubei Key Laboratory of Advanced technology of Automotive Components Wuhan University of TechnologyWuhanChina

This study examines the thermal runaway of a lithium ion battery caused by poor heat dissipation *** heat transfer process is analyzed on the basis of standard theoretical *** mist additives are considered as a tool to suppress the thermal runaway *** ensuing behaviour of the battery in terms of surface temperature and heat generation is analyzed for different charge and discharge *** is found that when the remaining charge is 100%,the heat generation rate of the battery is the lowest,and the surface temperature with a 2C charge rate is higher than that obtained for a 0.5C charge *** experimental results show that when the additive concentration is 20%NaCl,its ability to inhibit the thermal runaway is the strongest.

关键词： Lithium ion battery thermal runaway discharge rate heat generating rate water mist

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