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A Deep-Learning and Transfer-Learning Hybrid Aerosol Retrieval Algorithm for FY4-AGRI:Development and Verification over Asia

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Engineering 2024年第7期38卷 164-174页

作者： Disong Fu Hongrong Shi Christian AGueymard Dazhi Yang Yu Zheng Huizheng Che Xuehua Fan Xinlei Han Lin Gao Jianchun Bian Minzheng Duan Xiangao Xia Key Laboratory of Middle Atmosphere and Global Environment Observation Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 10029China Key Laboratory of Cloud-Precipitation Physics and Severe Storms Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Solar consulting services ColebrookNH 03576USA School of Electrical Engineering and Automation Harbin Institute of TechnologyHarbin 150006China State Key Laboratory of Severe Weather&Key Laboratory of Atmospheric Chemistry Institute of Atmospheric Composition and Environmental MeteorologyChinese Academy of Meteorological SciencesChina Meteorological AdministrationBeijing 100081China National Institute of Natural Hazards Ministry of Emergency Management of ChinaBeijing100085China Key Laboratory of Compound and Chained Natural Hazards Dynamics Ministry of Emergency Management of ChinaBeijing 100085China h National Satellite Meteorological Center China Meteorological AdministrationBeijing 100081China University of Chinese Academy of Sciences Beijing 100049China

The Advanced Geosynchronous Radiation Imager(AGRI)is a mission-critical instrument for the Fengyun series of *** acquires full-disk images every 15 min and views East Asia every 5 min through 14 spectral bands,enabling the detection of highly variable aerosol optical depth(AOD).Quantitative retrieval of AOD has hitherto been challenging,especially over *** this study,an AOD retrieval algorithm is proposed that combines deep learning and transfer *** algorithm uses core concepts from both the Dark Target(DT)and Deep Blue(DB)algorithms to select features for the machinelearning(ML)algorithm,allowing for AOD retrieval at 550 nm over both dark and bright *** algorithm consists of two steps:①A baseline deep neural network(DNN)with skip connections is developed using 10 min Advanced Himawari Imager(AHI)AODs as the target variable,and②sunphotometer AODs from 89 ground-based stations are used to fine-tune the DNN ***-of-station validation shows that the retrieved AOD attains high accuracy,characterized by a coefficient of determination(R2)of 0.70,a mean bias error(MBE)of 0.03,and a percentage of data within the expected error(EE)of 70.7%.A sensitivity study reveals that the top-of-atmosphere reflectance at 650 and 470 nm,as well as the surface reflectance at 650 nm,are the two largest sources of uncertainty impacting the *** a case study of monitoring an extreme aerosol event,the AGRI AOD is found to be able to capture the detailed temporal evolution of the *** work demonstrates the superiority of the transfer-learning technique in satellite AOD retrievals and the applicability of the retrieved AGRI AOD in monitoring extreme pollution events.

关键词： Aerosol optical depth Retrieval algorithm Deep learning Transfer learning Advanced Geosynchronous Radiation Imager

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Development of a multivariate empirical model for predicting weak rock mass modulus

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International Journal of Mining Science and Technology 2015年第4期25卷 545-552页

作者： Kallu Raj R. Keffeler Evan R. Watters Robert J. Agharazi Alireza Department of Mining Engineering University of Nevada RESPEC consulting and services University of Nevada Itasca Houston Inc.

Estimating weak rock mass modulus has historically proven difficult although this mechanical property is an important input to many types of geotechnical analyses. An empirical database of weak rock mass modulus with associated detailed geotechnical parameters was assembled from plate loading tests performed at underground mines in Nevada, the Bakhtiary Dam project, and Portugues Dam project. The database was used to assess the accuracy of published single-variate models and to develop a multivariate model for predicting in-situ weak rock mass modulus when limited geotechnical data are *** two of the published models were adequate for predicting modulus of weak rock masses over limited ranges of alteration intensities, and none of the models provided good estimates of modulus over a range of geotechnical properties. In light of this shortcoming, a multivariate model was developed from the weak rock mass modulus dataset, and the new model is exponential in form and has the following independent variables:(1) average block size or joint spacing,(2) field estimated rock strength,(3) discontinuity roughness, and(4) discontinuity infilling hardness. The multivariate model provided better estimates of modulus for both hard-blocky rock masses and intensely-altered rock masses.

关键词：多变量预测经验模型体模量软弱岩体弹性模量岩土工程特性经验数据库多变量模型

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Intensities of human disturbance dictate the floral diversity in tropical forest:the case of a secondary forest in Benguet, Philippines

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Journal of Mountain Science 2023年第6期20卷 1575-1588页

作者： Domelson A.BALANGEN Melchor S.CATONES Jane M.BAYENG Jones T.NAPALDET Global Inclusive Solution Environmental consulting services La TrinidadBenguet 2601Philippines Graduate School University of the Philippines Los BanosLaguna 4030Philippines Chemistry Department Benguet State UniversityLa TrinidadBenguet 2601Philippines Biology Department Benguet State UniversityLa TrinidadBenguet 26o1Philippines

This study inventoried the floral diversity of a secondary forest in Tuba,Benguet,Philippines as affected by different intensities of human *** study is unique from other land use studies in Southeast Asia in having conventional farms as the most disturbed land use while other sites have oil palm plantations.A total of 267 species belonging to 222 genera and 78 families was *** showed that the level of human disturbance is the major factor affecting the floral diversity while the effect of elevation is *** level of human disturbance is significantly associated with species richness,species composition,dominant species and biodiversity *** human disturbance,as in the case of conventional farms,results in lower species richness,predominantly weed composition,dominant weed species and lower biodiversity *** the other hand,lesser human disturbance(as in the case of secondary forest)leads to higher species richness,greater native species composition,dominance of indigenous species,and higher diversity *** most disturbed land use experienced the greatest loss of species richness,change in floristic composition and vegetation structure,as well as a shift from native to alien-dominated plant *** results showed that the effect of land use change is not limited to species richness but also to species composition,dominant species and biodiversity ***,the study is an important baseline data for biodiversity conservation of the Marcos Highway Watershed Forest Reserve.

关键词： Land use change Secondary forest Conventional farming Endemic species Exotic species

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GFRP Poles for Traffic Signs and Signal Poles: A Case Study in Saudi Arabia

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Open Journal of Civil Engineering 2022年第4期12卷 476-491页

作者： Waseem Ahmad Khatri Muhammed Al Mehthel Mirza M. Baig Tariq Al Baker consulting services Department Saudi Arabian Oil Company Dhahran Kingdom of Saudi Arabia Transportation & Equipment services Department Saudi Arabian Oil Company Dhahran Kingdom of Saudi Arabia

GFRP poles have been widely used as lighting poles but their use as traffic signs and signal poles is still under development. This paper highlights the literature review and case study of using GFRP poles for traffic signs and signal poles in the Eastern Province of Saudi Arabia. The case study details the design of poles, construction, maintenance and their performance. Traffic sign poles were manufactured using filament winding and signal poles using pultrusion process. AASHTO Standard “Specifications for Structural Supports for Highway Signs, Luminaires and Traffic Signals” and ANSI 136.2. were used as materials specification and design for the pole. There is a need to develop dedicated design and construction guidelines to standardize the construction process. Further study about the crash resistance of GFRP poles at different speeds needs to be explored. In addition, the paper presents a high level comparison between the different materials like weight, safety, environmental degradation, strength, service life, durability in an aggressive environment, carbon footprint and economics.

关键词： Glass Fiber Reinforced Plastics (GFRP) Poles Foundations Filament Winding Pultrusion

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A case study on the efficacy of different roof bolting schemes in Lhoist North America’s Crab Orchard Mine

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International Journal of Mining Science and Technology 2020年第1期30卷 99-104页

作者： Reece Kurre Gabriel Walton Stantec consulting services Inc. Walnut CreekCA 94597USA Department of Geology and Geological Engineering Colorado School of MinesGoldenCO 80401USA

Roof bolting has long been used in underground mines across the world to provide ground *** roof bolts are cheap and easy to install with the use of specialized machines as a part of the production cycle. Lhoist North America’s Crab Orchard Mine is an underground room and pillar limestone mine that uses mechanically anchored roof bolts for ground support. The mine currently employs two different roof bolting patterns: a standard 1.5 × 1.5 m pattern, and another 0.8 × 0.8 m pattern for use in areas with particularly hazardous roof conditions. The purpose of this study is to evaluate the relative effectiveness of each bolting pattern. A series of numerical models were created using Roc Science’s RS2. The models were based on a symmetrical section of the mine at its deepest point, and were modeled using generalized Hoek-Brown failure criterion along with a discrete fracture network. A series of sensitivity analyses were performed on the models by varying parameters such as joint friction angle, crack persistence, joint randomization, and tensile strength of the limestone. Based on the results of the original models and sensitivity analyses, it appeared that the standard bolting pattern provided sufficient roof support capacity under almost all the expected conditions at the mine, since safety factors below the design value of 1.5 were only found for individual bolts in a few of the worst test cases *** results can help improve the mine’s productivity and reduce operating costs without compromising safety.

关键词： Numerical modeling Mining Roof bolting Roof stability Analysis RocScience’s RS2 Underground stone

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An experimental and numerical study of chemically enhanced water alternating gas injection

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Petroleum Science 2015年第3期12卷 470-482页

作者： Saeed Majidaie Mustafa Onur Isa M.Tan Leap Energy-Subsurface consulting services Department of Petroleum and Natural Gas Engineering Istanbul Technical University Applied Science Department Universiti Teknologi Petronas

In this work, an experimental study combined with numerical simulation was conducted to investigate the potential of chemically enhanced water alternating gas （CWAG） injection as a new enhanced oil recovery method. The unique feature of this new method is that it uses alkaline, surfactant, and polymer additives as a chemical slug which is injected during the water alternating gas （WAG） process to reduce the interfacial tension （IFT） and simultaneously improve the mobility ratio. In essence, the proposed CWAG process involves a combination of chemical flooding and immiscible carbon dioxide （CO2） injection and helps in IFT reduction, water blocking reduction, mobility control, oil swelling, and oil viscosity reduction due to CO2 dissolution. Its performance was compared with the conventional immiscible water alter- nating gas （I-WAG） flooding. Oil recovery utilizing CWAG was better by 26 % of the remaining oil in place after waterflooding compared to the recovery using WAG conducted under similar conditions. The coreflood data （cumulative oil and water production） were history mat- ched via a commercial simulator by adjusting the relative permeability curves and assigning the values of the rock and fluid properties such as porosity, permeability, and the experimentally determined IFT data. History matching ofthe coreflood model helped us optimize the experiments and was useful in determining the importance of the parameters influencing sweep efficiency in the CWAG process. The effectiveness of the CWAG process in pro- viding enhancement of displacement efficiency is evident in the oil recovery and pressure response observed in the coreflood. The results of sensitivity analysis on CWAG slug patterns show that the alkaline-surfactant-polymer injection is more beneficial after CO2 slug injection due to oil swelling and viscosity reduction. The CO2 slug size analysis shows that there is an optimum CO2 slug size, around 25 % pore volume which leads to a maximum oil recover

关键词： Enhanced water alternating gas (CWAG) Enhanced oil recovery Interfacial tension Mobilitycontrol ~ Water blocking

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Flow correction control with electromagnetically induced preform resting process

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Advances in Manufacturing 2019年第2期7卷 199-208页

作者： Mohsen Poorzeinolabedin Kemal Levend Parnas Department of Mechanical Engineering Middle East Technical University Ankara Turkey Leopar Composite Engineering and consulting services Ltd. Ankara Turkey Department of Mechanical Engineering TED University Ankara Turkey

Resin flow correction control with electromagnetic field source, a new variation of the vacuum-assisted resin transfer molding (VARTM) process called electromagnetically induced preform resting (EIPR) for dynamical resin flow controlling is introduced to manipulate the flow front and local permeability to prevent the formation of dry spots. This paper proposes an active and real-time flow control approach that is implemented during the composite laminate infusion. The EIPR process applies an electromagnetic field source to pinch (raise) and vibrate the upper flexible mold to rest the fiber preform and increase the local permeability. Vibration action delivers the fluid through the preform. The EIPR process includes a new and creative upper flexible vacuum bag with embedded elements to lift and create local vibrations via an automated gantry system. The control methodology is performed by tracking the flow front with a real-time correction. System capability is demonstrated with three configurations of preform of different preform permeabilities in each experiment. A low permeability preform is employed in these configurations to disturb the flow pattern and cause an artificial problem or pseudo problem during the filling process. The results indicate that this system fills the mold completely and reduces the filling time without any dry spots and therefore creates no waste material.

关键词： Resin flow Process monitoring On-line flow control Vacuum-assisted resin transfer molding

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Methane and Hydrogen Storage in Metal Organic Frameworks: A Mini Review

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Journal of Environmental & Earth Sciences 2020年第2期2卷 56-68页

作者： Oghenegare Emmanuel Eyankware Idaeresoari Harriet Ateke TegaFej consulting services Port HarcourtRivers StateNigeria Department of Petroleum and Gas Engineering University of Port HarcourtRivers stateNigeria

The need for a net zero carbon emission future is imperative forenvironmental sustainability hence, intensive carbon fuels would need tobe replaced with less carbon emitting energy sources such as natural gastill clean energy source such as hydrogen becomes commercialized. Asa result, this mini review discusses the use of metal organic framework(MOF) for adsorption of methane and hydrogen in specially designed tanksfor improved performance so as to increase their applicability. Herein,adsorption (delivery) capacity of selected high performing MOFs formethane and hydrogen storage were highlighted in reference to the targetsset by United States Department of Energy’s Advanced Research ProjectsAgency-Energy (ARPA-E) and Fuel Cells Technology Office. In thisregard, specific design and chemistry of MOFs for improved methane andhydrogen adsorption were highlighted accordingly. In addition, an overviewof computational and molecular studies of hypothetical MOFs was done- the various approaches used and their proficiency for construction ofspecific of crystalline structures and topologies were herewith discussed.

关键词： Methane Hydrogen Metal organic framework Adsorption Storage Computational

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Educating children with autism in China-implementing Hong Kong Rainbow Model in Mainland

Educating children with autism in China-implementing Hong Ko...

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第十九届世界儿童及青少年精神卫生与相关学科学术会议

作者： Tad Zhengzhang Pu Geraldine Solis Rainbow consulting services Norway

＜正＞The Rainbow Model（TRM） is an education program for children with autism and other related developmental *** aims to provide a balance and sound approach in teaching children with *** believes in providing a learning environment that inspires children to be the best they can *** recognizes that children needs time to explore and enjoy their childhood,thus,providing them a learning opportunity that is not solely focus on the cognitive aspect of development but responds as well to their social,emotional,and physical ***

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Application of Van Der Lugt optical correlation techniques to the holographic examination of hermetically sealed neuroprostheses

Application of Van Der Lugt optical correlation techniques t...

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1992 International Conference on Lasers and Optoelectronics(ICLOE’92)

作者： Colleen Fitzpatrick Electro Optic consulting services

As neuroprostheses are reduced in size,and as they are implanted in younger individuals with increasing life expectancies,the demands on the biomaterials used to protect them from the hostile extracellular environment are ***,implantable electronic packages must meet stringent quality assurance specifications,which dictate that both gross(～10 atm cc/sec) and fine(～10 atm cc/sec) leak testing must be performed on even very delicate *** such devices,Van der Lugt Optical Correlation(VLOC) Techniques offer the potential of superseding conventional leak testing methodologies, in that working with light is cleaner,faster,more sensitive,and eliminates the disadvantages of tracer gas introduced through backfilling or "bombing".This paper will briefly present VLOC techniques,coupled with a discussion of basic leak *** ability of the method to detect and to estimate the size of leaks down to 10 atm cc/sec will be demonstrated,and a comparison will be made between VLOC techniques and conventional helium leak testing methodology in terms or accuracy,speed,efficiency,and total cost.

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