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SolidEarth： a new Digital Earth system for the modeling and visualization of the whole Earth space

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Frontiers of Earth Science 2014年第4期8卷 524-539页

作者： Liangfeng ZHU jianzhong sun Changling LI Bing ZHANG Key Laboratory of Geographic Information Science for Ministry of Education East China Normal University Shanghai 200241 China Center for Earth System Science Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201203 China School of Environmental Science and Spatial Informatics China University of Mining and Technology Xuzhou 221008 China College of Geomatics Engineering Nanjing University of Technology Nanjing 211816 China.

Although many of the first-generation Digital Earth systems have proven to be quite useful for the modeling and visualization of geospatial objects relevant to the Earth＇s surface and near-surface, they were not designed for the purpose of modeling and application in geological or atmospheric space. There is a pressing need for a new Digital Earth system that can process geospatial information with full dimensionality. In this paper, we present a new Digital Earth system, termed SolidEarth, as an alternative virtual globe for the modeling and visualization of the whole Earth space including its surface, interior, and exterior space. SolidEarth consists of four functional components： modeling in geographical space, modeling in geological space, modeling in atmo- spheric space, and, integrated visualization and analysis. SolidEarth has a comprehensive treatment to the third spatial dimension and a series of sophisticated 3D spatial analysis functions. Therefore, it is well-suited to the volumetric representation and visual analysis of the inner/ outer spheres in Earth space. SolidEarth can be used in a number of fields such as geoscience research and education, the construction of Digital Earth applications, and other professional practices of Earth science.

关键词： Digital Earth Earth space full dimensionality,visualization

A data-driven health indicator extraction method for aircraft air conditioning system health monitoring

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Chinese Journal of Aeronautics 2019年第2期32卷 409-416页

作者： jianzhong sun Chaoyi LI Cui LIU Ziwei GONG Ronghui WANG Department of Civil Aviation Nanjing University of Aeronautics and Astronautics Maintenance Engineering Department Xiamen Airlines

Prognostics and Health Management(PHM) has become a very important tool in modern commercial aircraft. Considering limited built-in sensing devices on the legacy aircraft model,one of the challenges for airborne system health monitoring is to find an appropriate health indicator that is highly related to the actual degradation state of the system. This paper proposed a novel health indicator extraction method based on the available sensor parameters for the health monitoring of Air Conditioning System(ACS) of a legacy commercial aircraft model. Firstly, a specific Airplane Condition Monitoring System(ACMS) report for ACS health monitoring is defined. Then a non-parametric modeling technique is adopted to calculate the health indicator based on the raw ACMS report data. The proposed method is validated on a single-aisle commercial aircraft widely used for short and medium-haul routes, using more than 6000 ACMS reports collected from a fleet of aircraft during one year. The case study result shows that the proposed health indicator can effectively characterize the degradation state of the ACS, which can provide valuable information for proactive maintenance plan in advance.

关键词： Air conditioning system Aircraft health monitoring Airplane condition monitoring system Health indicator Prognostics and health management

APPROXIMATE COMMON DIVISORS OF POLYNOMIALS AND DEGREE REDUCTION FOR RATIONAL CURVES

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Applied Mathematics(A Journal of Chinese Universities) 1998年第4期13卷 437-444页

作者： sun jianzhong,CHEN FALAI AND QU YONGMING Department of Mathematics University of Science and Technology of China

Abstract This paper deals with how to perturb a given set of polynomials so as to include a common linear factor. An algorithm is derived for determining such a set of perturbation polynomials which are subject to certain constrains at the endpoints of a prescribed parametric interval and minimized in a certain sense. This result can be combined with subdivision technique to obtain a continuous piecewise approximation to a rational curve.

关键词： Rational curve degree reduction subdivision approximate common divisor

In-service aircraft engines turbine blades life prediction based on multi-modal operation and maintenance data

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Propulsion and Power Research 2021年第4期10卷 360-373页

作者： He Liu jianzhong sun Shiying Lei Shungang Ning College of Civil Aviation Nanjing University of Aeronautics and AstronauticsNanjing210016China

The in-service life of turbine blades directly affects the on-wing lifetime and operating cost of aircraft *** would be essential to accurately evaluate the remaining useful life of turbine blades for safe engine operation and reasonable maintenance *** this paper,a machine learning-based mechanism with multiple information fusion is proposed to predict the remaining useful life of high-pressure turbine *** developed method takes account of the in-service operating factors such as the high-pressure rotor speed and exhaust gas temperature,as well as the engine operating environments and performance *** effectiveness of this method is demonstrated on simulated test cases generated by an integrated blade creep-life assessment model,which comprises engine performance,blade stress,thermal,and creep life estimation *** results show that the proposed method provides a prospective result for in-service life evaluation of turbine blades and is of significance to evaluating the engine on-wing lifetime and making a reasonable maintenance plan.

关键词： Multi-modal operating data fusion High pressure turbine blade Remaining useful life prediction Operating condition Creep life

Real-Time Electrostatic Monitoring of Wear Debris for Wind Turbine Gearbox

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Transactions of Nanjing University of Aeronautics and Astronautics 2017年第2期34卷 195-204页

作者： Li Xin Zuo Hongfu Cai Jing sun jianzhong Liu Ruochen Xu Yutong College of Civil Aviation Nanjing University of Aeronautics and Astronautics School of Automobile and Traffic Engineering Jiangsu University of Technology

Engineering practice has shown that early faults of gearboxes are a leading maintenance cost driver that can easily lower the profit from a wind turbine operation.A novel oil-lubricated electrostatic monitoring of wear debris for a wind turbine gearbox is *** continuous wavelet transform(CWT)is used to eliminate the noises of the original electrostatic *** kurtosis and root mean square(RMS)values of the time domain signal are extracted as the characteristic parameters to reflect the deterioration of the *** overall tendency of electrostatic signals in accelerated life test is *** the eighth cycle,the abnormal wear in the wind turbine gearbox is detected by electrostatic monitoring.A comparison with the popular MetalScan monitoring is given to illustrate the effectiveness of the electrostatic monitoring *** results demonstrate that the electrostatic monitoring method can detect the fault accurately.

关键词： wind turbine gearbox oil-lubricated system electrostatic monitoring characteristic parameter accelerated life test

A critical review of microplastics in aquatic ecosystems: Degradation mechanisms and removing strategies

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Environmental Science and Ecotechnology 2024年第5期21卷 62-76页

作者： Sameh S.Ali Tamer Elsamahy Rania Al-Tohamy jianzhong sun Biofuels Institute School of the Environment and Safety EngineeringJiangsu UniversityZhenjiang212013China Botany Department Faculty of ScienceTanta UniversityTanta31527Egypt

Plastic waste discarded into aquatic environments gradually degrades into smaller fragments,known as microplastics(MPs),which range in size from 0.05 to 5 *** ubiquity of MPs poses a significant threat to aquatic ecosystems and,by extension,human health,as these particles are ingested by various marine organisms including zooplankton,crustaceans,and fish,eventually entering the human food *** contamination threatens the entire ecological balance,encompassing food safety and the health of aquatic ***,developing effective MP removal technologies has emerged as a critical area of ***,we summarize the mechanisms and recently reported strategies for removing MPs from aquatic *** combining physical and chemical pretreatments with microbial degradation have shown promise in decomposing *** such as bacteria,fungi,algae,and specific enzymes are being leveraged in MP remediation *** advancements have focused on innovative methods such as membrane bioreactors,synthetic biology,organosilane-based techniques,biofilm-mediated remediation,and nanomaterial-enabled strategies,with nano-enabled technologies demonstrating substantial potential to enhance MP removal *** review aims to stimulate further innovation in effective MP removal methods,promoting environmental and social well-being.

关键词： Persistent organic pollutants Bioremediation Nanomaterial-enabled strategies Aquatic environment Ecotoxicity of microplastics

Exploring the region-wise diversity and functions of symbiotic bacteria in the gut system of wood-feeding termite,Coptotermes formosanus,toward the degradation of cellulose,hemicellulose,and organic dyes

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Insect Science 2022年第5期29卷 1414-1432页

作者： Mudasir A.Dar Rongrong Xie Radhakrishna S.Pandit Blessing Danso Chenchen Dong jianzhong sun Biofuels Institute School of the Environment and Safety EngineeringJiangsu UniversityZhenjiangJiangsu ProvinceChina Department of Zoology Savitribai Phule Pune UniversityGaneshkhindPuneIndia

The wood-feeding termite Coptotermes formosanus represents a unique and impressive system for lignocellulose *** highly efficient digestion of lignocellulose is achieved through symbiosis with gut symbionts like *** extensive research during the last three decades,diversity of bacterial symbionts residing in individual gut regions of the termite and their associated functions is still *** this end,cellulose,xylan,and dye-decolorization bacteria residing in foregut,midgut,and hindgut regions of *** were enlisted by using enrichment and culture-dependent molecular methods.A total of 87 bacterial strains were successfully isolated from different gut regions of *** which belonged to 27 different species of 10 genera,majorly affiliated with Proteobacteria(80%)and Firmicutes(18.3%).Among the gut regions,37.9%of the total bacterial isolates were observed in the hindgut that demonstrated predominance of cellulolytic bacteria(47.6%).The majority of the xylanolytic and dye-decolorization bacteria(50%)were obtained from the foregut and midgut,*** represented by Dietza *** observed in the hindgut *** on species richness,the highest diversity was observed in midgut and hindgut regions each of which harbored seven unique bacterial *** members of Enterobacter,Klebsiella,and Pseudomonas were common among the gut *** lignocellulolytic activities of the selected potential bacteria signpost their assistance to the host for lignocellulose *** overall results indicate that *** harbors diverse communities of lignocellulolytic bacteria in different regions of the gut *** observations will significantly advance our understanding of the termite–bacteria symbiosis and their microbial ecology uniquely existed in different gut regions of ***,which may further shed a light on its potential values at termite-modeled biotechnology.

关键词： bacterial symbionts Coptotermes formosanus culture-dependent gut regions lignocellulose termite

Nanocellulose from various biomass wastes:Its preparation and potential usages towards the high value-added products

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Environmental Science and Ecotechnology 2021年第1期5卷 10-21页

作者： Sujie Yu jianzhong sun Yifei Shi Qianqian Wang Jian Wu Jun Liu Biofuels Institute School of the Environment and Safety EngineeringJiangsu University301 Xuefu Road212013ZhenjiangChina Key Laboratory of Pulp and Paper Science&Technology of Ministry of Education Qilu University of Technology(Shandong Academy of Sciences)250353JinanChina

Biomass waste comes from a wide range of sources,such as forest,agricultural,algae wastes,as well as other relevant industrial *** is an important alternative energy source as well as a unique source for various bioproducts applied in many *** the past two decades,how to reuse,recycle and best recover various biomass wastes for high value-added bioproducts has received significant attention,which has not only come from various academia communities but also from many civil and medical *** summarize one of the cutting-edge technologies applied with nanocellulose biomaterials,this review focused on various preparation methods and strategies to make nanocellulose from diverse biomass wastes and their potential applications in biomedical areas and other promising new fields.

关键词： Biomass waste Nanocellulose Biomedical application Environmentally-functional materials

Phatic Communication Between Chinese and Westerners

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镇江市高等专科学校学报 1998年第2期11卷 46-50,60页

作者： sun jianzhong

Introduction Phatic language refers to language used for establishing an atmosphere or maintaining social contact rather than for exchanging ingformation or ideas,It can be divided into rhree pares:greetings,farewel... 详细信息

关键词：问候语再见闲聊交际性谈话中国人西方人