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Efficient high-accuracy north-south station-keeping strategy for geostationary satellites

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Science China(Technological Sciences) 2021年第11期64卷 2415-2426页

作者： HUANG XuXing yang bin LI Shuang WANG ZhenBo College of Astronautics Nanjing University of Aeronautics and AstronauticsNanjing 210016China Department of Mechanical Aerospaceand Biomedical EngineeringUniversity of TennesseeKnoxvilleTN 37996USA

Station-keeping(SK) is indispensable in actual geostationary(GEO) satellite missions. Due to the luni-solar gravity perturbations, the inclination of a GEO satellite suffers the issues of secular drift and long-period oscillation. Current north-south(NS)SK strategies maintain the GEO satellite’s orbit with high accuracy but low fuel efficiency. In this work, an efficient highaccuracy NS-SK strategy is developed for the GEO satellites. First, an averaging method is employed to decrease the accumulation of the secular drift within a one-solar-day SK cycle, while the long-period oscillation caused by the solar gravity is damped to further improve the orbital accuracy using the impulse and finite-thrust propulsions. Second, we contribute a fueloptimal cycle that reduces the fuel consumption and a fixed-interval cycle that executes SK control in fixed time interval every day to further enhance the proposed NS-SK strategy. Numerical simulations show that the improved strategy can achieve highaccuracy NS-SK with little fuel consumption. Moreover, results also demonstrate that the fixed-interval cycle can reach higher NS-SK accuracy while consuming less fuel.

关键词： geostationary orbit north-south station-keeping long-period oscillation fuel-optimal fixed-interval

Preface from Editor in Chief

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Tungsten 2019年第1期1卷 1-2页

作者： bin yang Jiangxi University of Science and Technology Ganzhou 341000China

Welcome to the inaugural issue of Tungsten,a new peer-reviewed academic journal of its *** publication of the journal has a far-reaching significance to both the non-ferrous metals industry of the world and Jiangxi University of Science and Technology(JXUST),one of the organizers of the ***,the world’s largest tungsten ore resources owner and producer,plays an important role in tungsten industry all over the ***,located in Ganzhou which is widely known as“the tungsten capital of the world”due to its abundant tungsten resources,has made a series of aca-demic and technological breakthroughs in the basic theory and application technology of *** on impressive achievement,growing interest in the field and district advan-tages,the Nonferrous Metals Society of China(Nfsoc)and JXUST take the initiative in founding the journal to support the original innovation in the tungsten field and serve the high-quality development of tungsten and related industries.

关键词： journal breakthrough tungsten

Development characteristics of interlayer oxidation zone type of sandstone uranium deposits in the southwestern Turfan-Hami basin

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Science China Earth Sciences 2004年第5期47卷 419-426页

作者： yang Dianzhong XIA bin WU Guogan Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China

The Turfan-Hami basin is the key area for the exploration of sandstone uranium deposits of the leachable interlayered oxidation zone type. The aim of this study is to shed light on the development characteristics of this type of uranium deposits and provide new clues to further exploration. Detailed study led to the following conclusions: (1) uranium orebodies are hosted mainly in the lower Middle Jurassic Xishanyao Formation and the lower Lower Jurassic Badaowan Formation; (2) the formation of uranium orebodies is closely related to organic matter; (3) the front of the interlayered oxidation zone is snake-shaped in plane and imbricated in the section; the more the interlayered oxidation zone and zonation are developed, the better the uranium mineralization will be; according to lithological and geochemical characteristics, the oxidation zone, the oxidation-reduction transitional zone and the reduction zone can be distin-guished; (4) the development of interlayered oxidation zone is controlled by geological structure, underground water, sandstone permeability and other factors; (5) sandstone uranium orebodies hosted in the interlayered oxidation zone are very complicated in spatial distribution, of which some are rolled and plated in shape and some are highly variable in shape.

关键词： Turfan-Hami basin, interlayered oxidation zone, sandstone uranium deposit, development characteristics.

Making fully printed perovskite solar cells stable outdoor with inorganic superhydrophobic coating

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Journal of Energy Chemistry 2020年第11期29卷 332-338页

作者： Jianqiang Luo Hong bin yang Mingxiang Zhuang Shujuan Liu Liang Wang bin Liu State Key Laboratory of Nuclear Resources and Environment.East China University of Technology.Nanchang 330013 JiangxiChina School of Chemical&Biomedical Engineering(SCBE) Nanyang Technological University62 Nanyang DriveSingapore 637459Singapore Integrated Computational Materials Research Centre Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 201899China

Outdoor environment including moisture, dust, UV, oxygen and thermal stress(repeated heating-cooling)is devastating to perovskite solar cells(PSCs). Here, we demonstrate a new strategy to make fully printed PSCs stable with maximum power output in outdoor environment by coating them with a porous hydrophobic inorganic layer. After coating, the PSCs can maintain superior stability of more than 150 days of outdoor storage, 240 h of continuous operation at the maximum power output point in ambient air with relative humidity as high as ~80%, and stable operation for more than 10 h under raining condition. ANSYS simulation shows that the thin and porous nature of the inorganic coating layer offers much better heat dissipation than conventional encapsulation methods using glasses attached by photocurable epoxy. A similar thermal expansion coefficient of the inorganic encapsulation material with the solar cell substrate can also prevent it from cracking after repeated heating-cooling cycles. All of these merits resulted from our encapsulation method endow the perovskite solar cells with the real outdoor working capability.

关键词： Perovskite solar cells Inorganic encapsulation Heat dissipation Outdoor stability

Interaction of Ethylene-N,N'-dianthranilate to Ni(Ⅱ):binding Properties and Coordination Mode Studies

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Chinese Journal of Structural Chemistry 2013年第12期32卷 1787-1792页

作者： FENG Jiao WANG Jing-Lin LIU bin yang bin-Sheng Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education Institute of Molecular ScienceShanxi University

The binding properties of ethylene-N,N＇-dianthranilate （EDA） and Ni（II） were studied by difference UV-Vis in 0.05 M Tris-HCl buffer （pH 7.4）. The stoichiometric ratio of EDA to nickel （1：1） was confirmed and the conditional binding constant （IogKNi-EDA = 12.33 ± 0.06） was obtained. In addition, an interesting tetranuclear complex [Nin（EDA）4]·2CH3CH2OH-9H2O was obtained unexpectedly in alcohol-water solution and characterized by X-ray crystallography and electrospray ionization mass spectra （ESI-MS）. It is found that EDA acts as a pentadentate ligand and performs a chelating-bridging coordination mode.

关键词： ethylene-N,N'-dianthranilate Ni(Ⅱ) spectrum crystal structure

Novel conservative treatment for peritoneal dialysis-related hydrothorax:Two case reports

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World Journal of Clinical Cases 2020年第24期8卷 6437-6443页

作者： bin-bin Dai Bei-Duo Lin Li-Yan yang Jian-Xin Wan yang-bin Pan Department of Nephrology The First Affiliated Hospital of Fujian Medical UniversityFuzhou 350005Fujian ProvinceChina Department of Nephrology Shanghai Pudong HospitalShanghai 201399China

BACKGROUND Peritoneal dialysis (PD) is an important renal replacement therapy for patientswith end-stage renal disease. PD-related hydrothorax is a rare but seriouscomplication in PD patients, produced by the movement of peritoneal dialysatethrough pleuroperitoneal fistulas. In previous reports, patients with hydrothoraxsecondary to PD were usually recommended to discontinue PD and transfer tohemodialysis (HD). Herein, we describe another method of managing thiscomplication—with an adjusted PD prescription and continuous drainage ofpleural effusion, patients could continue PD without recurrence of *** SUMMARY In this report, we present the medical records of 2 patients with hydrothoraxsecondary to PD. We recommended intermittent PD with continuous drainage ofpleural effusion. A type 18Ga soft catheter was placed to drain pleural ***-guided thoracentesis was performed, and the soft catheter was placedin the pleural cavity for a long period (3 mo and 2 mo, respectively). The pleuralcatheter was removed when no fluid was drained from the pleural cavity. Afterseveral months, pleuroperitoneal fistulas were closed in both patients and PD wascontinued. These patients did not transfer to HD, had no recurrence ofhydrothorax and were still treated with PD after 1 *** These 2 case reports show that continuous drainage of pleural effusion with an18Ga soft catheter is a useful method for hydrothorax secondary to PD.

关键词： Peritoneal dialysis End-stage renal disease Hydrothorax Treatment Conservative Case report

Review on Renewable Energy Source Fault Characteristics Analysis

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CSEE Journal of Power and Energy Systems 2022年第4期8卷 963-972页

作者： Tianshu Bi bin yang Ke Jia Liming Zheng Qian Liu Qixun yang School of Electrical and Electronic Engineering North China Electric Power UniversityBeijing 102206China

The increase of renewable energy sources(RESs),especially wind power and photovoltaic,is bringing different fault features to the power system compared with the traditional syn-chronous generator,resulting in the urgent need for precise fault *** to the sequentially activated fault features,the short circuit characteristics of RES can be divided into three fault *** the staged framework of fault duration,the published research is reviewed to provide a systematic analysis of RES fault ***'s concluded that the hardware parameter determines the sub-transient fault features of RES,whereas RES control begins to dominate during the following transient ***,the neglection of voltage transition and unavailable RES output phase shall impede the application of the analytical conclusions in protection *** solve the existing problems,interaction among RES and networks must be figured ***,the fault calculation of the integral RES-grid system is offered as the research prospect.

关键词： Fault characteristics analysis fault stages renewable energy sources

Aeroelastic modeling of wind loading on a cable-net supported glass wall

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Acta Mechanica Sinica 2010年第3期26卷 409-415页

作者： Zhifu Gu Letian yang Yan Li bin Chen LTCS and College of Engineering Peking University 100871 Beijing China

Wind loading study on a cable-net supported glass wall is conducted by means of wind tunnel tests. An equiva- lent aeroelastic model is designed and constructed. Response of displacements of the wall is measured and analyzed. In order to design a glass wall under wind loading, the ＂wind- vibration factor＂ is estimated and discussed. In fact, the mech- anism of wind acting on the wall is commonly known not only as positive pressure, but also as negative pressure caused by the flow separation on the corners of the building. Due to the diffidence in the mechanism of wind acting, two typi- cal response cases are classified. The results show that the dynamic response of the structure caused by the negative pressure is stronger than that of the positive pressure case. To determine the aerodynamic wind loading on a flexible part of structure on a building, wind tunnel study may be useful and play an important role.

关键词： Wind tunnel study Cable-net supported glasswall - Wind-vibration factor Aeroelastic model

Bending and Twisting Springback Prediction in the Punching of the Core for a Lattice Truss Sandwich Structure

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Acta Metallurgica Sinica(English Letters) 2013年第3期26卷 241-246页

作者： Wenchun JIANG bin yang Xuewei GUAN Yun LUO State Key Laboratory of Heavy Oil Processing College of Chemical Engineering China University of Petroleum (East China)

The finite element method was used to study the springback induced by the punching of the core. In order to simulate the springback accurately, a mixed isotropic-nonlinear kinematic hardening model is used to define the material mechanical behavior during plastic deformation. The effects of the friction coefficient, the plate thickness and the die radius have been investigated. The results show that the springback of the sheet with diamond hole is different from the homogenous sheet. Not only bending springback, but also a twisting springback along the truss is generated because of the non-uniform distribution of the bending stress along the truss length. The plate thickness should be around 1.3 mm with larger friction coefficient and smaller die radius, which is useful to decrease the bending and twisting springback.

关键词： Plate with diamond hole Punch Springback