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Relationship between mass discharge rate and granular temperature of silo flow with variance of outlets

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Particuology 2022年第4期20卷 76-82页

作者： Quan Chen Ran Li Wengzheng Xiu vladimir Zivkovic Hui Yang School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China School of Medical Instrument and Food Engineering University of Shanghai for Science and Technology Shanghai 200093China School of Engineering.Newcastle University NE17RUUnited Kingdom

A lower granular temperature zone near the orifice in silos was found by speckle visibility spectroscopy ***,the values of granular temperature in this area are inversely proportional to the mass discharge rate(MDR).This finding that links the macroscopic MDR with mesoscopic dynamics temperature of the particle system,is obtained by looking at the effect that different outlet sizes of silos on MDR and granular temperature *** from evidencing the relevance of a parameter that has been traditionally overlooked in silos,this relationship supposes a benchmark with which to explore the influence of small orifice sizes on *** these,we found that the frequency of intermittent clogging and their dependence on the size of the outlet.

关键词： Silos Granular flow Granular temperature Mass discharge rate

Multiple input self-organizing-map ResNet model for optimization of petroleum refinery conversion units

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Frontiers of Chemical Science and Engineering 2023年第6期17卷 759-771页

作者： Jiannan Zhu vladimir Mahalec Chen Fan Minglei Yang Feng Qian Key Laboratory of Smart Manufacturing in Energy Chemical Process Ministry of EducationEast China University of Science and TechnologyShanghai 200237China Department of Chemical Engineering McMaster UniversityHamiltonOntario L8S 4L8Canada Engineering Research Center of Process System Engineering Ministry of EducationEast China University of Science and TechnologyShanghai 200237China

This work introduces a deep-learning network,i.e.,multi-input self-organizing-map ResNet(MISR),for modeling refining units comprised of two reactors and a separation *** model is comprised of self-organizing-map and the neural network *** self-organizing-map part maps the input data into multiple two-dimensional planes and sends them to the neural network *** the neural network part,residual blocks enhance the convergence and accuracy,ensuring that the structure will not be overfitted *** of the MISR model of hydrocracking unit also benefits from the utilization of prior knowledge of the importance of the input variables for predicting properties of the *** results show that the proposed MISR structure predicts more accurately the product yields and properties than the previously introduced self-organizing-map convolutional neural network model,thus leading to more accurate optimization of the hydrocracker ***,the MISR model has smoother error convergence than the previous *** operating conditions have been determined via multi-round-particle-swarm and differential evolution *** experiments show that the MISR model is suitable for modeling nonlinear conversion units which are often encountered in refining and petrochemical plants.

关键词： hydrocracking convolutional neural networks self-organizing map deep learning data-driven optimization

Scalable Deposition Methods for Large-Area Production of Perovskite Thin Films

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Energy & Environmental Materials 2019年第2期2卷 119-145页

作者： Richard Swartwout Maximilian T.Hoerantner vladimir Bulovic Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology77 Massachusetts AvenueCambridge MA 02139USA

The recent steady improvements in the performance of the nascent hybrid perovskite photovoltaic(PV)devices have led to power conversion efficiencies that rival the best-performing established PV ***,to scale these laboratory demonstrations to PV module-scale production will require development of scalable deposition methods for perovskite thin *** record result for perovskite PVs so far was achieved via spin coating,a technique that is popular in research laboratories for thin-film coating over relatively small device areas,but not considered to be a method that could be used to scale up the manufacturing of perovskite *** larger thin-film areas are needed for future commercial PV ***,some researchers have focused their efforts on perovskite deposition techniques that can be considered as scalable for mass production and have achieved notable results even on large ***,we present an overview of the solution-based and vapor-based deposition processes;we explain their influence on the molecular crystal growth behavior of perovskite thin films and discuss the morphology as well as other material quality *** presenting a comprehensive comparison of the deposition techniques and the corresponding performance parameters for different device sizes,we intent to guide the growing research community through the methods that might enable mass production of perovskite solar products.

关键词： perovskite solar cells scalable deposition solution processing vapor deposition

Citation and bibliographic coupling between authors in the field of social network analysis

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Journal of Data and Information Science 2024年第4期9卷 110-154页

作者： Daria Maltseva vladimir Batagelj National Research University Higher School of Economics 101000 MoscowRussia Institute of Mathematics Physics and Mechanics1000 LjubljanaSlovenia University of Primorska Andrej MarušičInstitute6000 KoperSlovenia

Purpose:We analyzed the structure of a community of authors working in the field of social network analysis(SNA)based on citation indicators:direct citation and bibliographic coupling *** observed patterns at the micro,meso,and macro levels of ***/methodology/approach:We used bibliometric network analysis,including the“temporal quantities”approach proposed to study temporal *** a two-mode network linking publications with authors and a one-mode network of citations between the works,we constructed and analyzed the networks of citation and bibliographic coupling among *** used an iterated saturation data collection ***:At the macro-level,we observed the global structural features of citations between authors,showing that 80%of authors have not more than 15 citations from other *** the meso-level,we extracted the groups of authors citing each other and similar to each other according to their citation *** have seen a division of authors in SNA into groups of social scientists and physicists,as well as into other groups of authors from different *** found some examples of brokerage between different groups that maintained the common identity of the *** the micro-level,we extracted authors with extremely high values of received citations,who can be considered as the most prominent authors in the *** examined the temporal properties of the most popular *** limitations:The main challenge in this approach is the resolution of the author’s name(synonyms and homonyms).We faced the author disambiguation,or“multiple personalities”(Harzing,2015)*** remain consistent and comparable with our previously published articles,we used the same SNA data collected up to *** analysis and conclusions on the activity,productivity,and visibility of the authors are relative only to the field of *** implications:The proposed approach can be utilized for similar objectives and

关键词： Development of scientific fields Social network analysis Bibliographic network Temporal network Citation Bibliographic coupling

Variations of Dissolved Iron in the Amur River During an Extreme Flood Event in 2013

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Chinese Geographical Science 2016年第5期26卷 679-686页

作者： YAN Baixing GUAN Jiunian vladimir SHESTERKIN ZHU Hui Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and Agroecology Chinese Academy of Sciences School of Environment Northeast Normal University Institute of Water and Ecology Problems Far Eastern Branch Russian Academy of Sciences

As a key factor limiting primary productivity in marine ecosystem, dissolved iron(DFe) export from fluvial systems has increased recently. There is particular concern about discharges of DFe during extreme flooding, when they are thought to increase considerably. An extreme flood event that caused inundation of extensive areas of Far Eastern Russia and Northeastern China occurred in the basin of the Amur River during summer and autumn 2013. During this event, water samples were collected in the middle reaches of the Amur River and the lower reaches at Khabarovsk City and analyzed for DFe concentrations and other aquatic parameters. The results show that the average DFe concentrations in the middle reaches of the Amur River(right bank) and at Khabarovsk were 1.11 mg/L and 0.32 mg/L, respectively, during the extreme flood in 2013. The total discharge of DFe during the flood event was 6.25 × 104 t. The high discharge of DFe during the flood reflects the elevated discharge of the river, hydrologically connected riparian wetlands, vast quantities of terrestrial runoff, and flood discharges from the Zeya and Bureya reservoirs. These results show that long-term monitoring is needed to identify and assess the impacts of DFe transport on the downstream reaches, estuarine area, and coastal ecosystems of the Amur River.

关键词： dissolved iron dissolved organic matter extreme flooding event land use the Amur River wetland

Neural network learns physical rules for copolymer translocation through amphiphilic barriers

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npj Computational Materials 2020年第1期6卷 1039-1046页

作者： Marco Werner Yachong Guo vladimir A.Baulin Institute Theory of Polymers Leibniz-Institut für Polymerforschung Dresden e.V.Hohe Straße 601069 DresdenGermany Departament d’Enginyeria Química Universitat Rovira i Virgili26 Av.dels Paisos Catalans43007 TarragonaSpain Kuang Yaming Honors School Nanjing University22 Hankou Road210093 NanjingChina

Recent developments in computer processing power lead to new paradigms of how problems in many-body physics and especially polymer physics can be *** processors can be exploited to generate millions of molecular configurations in complex environments at a second,and concomitant free-energy landscapes can be *** that are complete in terms of polymer sequences and architecture form a powerful training basis for cross-checking and verifying machine learning-based *** employ an exhaustive enumeration of polymer sequence space to benchmark the prediction made by a neural *** our example,we consider the translocation time of a copolymer through a lipid membrane as a function of its sequence of hydrophilic and hydrophobic ***,we demonstrate that massively parallel Rosenbluth sampling for all possible sequences of a polymer allows for meaningful dynamic interpretation in terms of the mean first escape times through the ***,we train a multi-layer neural network on logarithmic translocation times and show by the reduction of the training set to a narrow window of translocation times that the neural network develops an internal representation of the physical rules for sequencecontrolled diffusion *** on the narrow training set,the network result approximates the order of magnitude of translocation times in a window that is several orders of magnitude wider than the training *** investigate how prediction accuracy depends on the distance of unexplored sequences from the training window.

关键词： neural network narrow

Experimental study on the performance of a rotational supercavitating evaporator for desalination

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Science China(Technological Sciences) 2014年第11期57卷 2115-2130页

作者： LIKHACHEV Dmitriy S LI FengChen KULAGIN vladimir A School of Energy Science and Engineering Harbin Institute of Technology Department of Heat Technology and Fluid Dynamics Siberian Federal University

Efforts have been made on experimental research of a supercavitation device for desalination, which is named rotational supercavitating evaporator （RSCE）. The RSCE is characterised by the simple construction and responsive capacity control, and only requires rough filtration of the source water for scaling- and fouling-free operations. The present study has been conducted for the water flow at temperature of around 22-30℃ and atmospheric pressure as the first step for investigation of the performance characteristics of RSCE. The multiply factor extremal experiments conducted with the Box-Wilson＇s method have revealed the salinity of the condensate, the temperature of steam inside the supercavity, and dependence of the shape of supercavity on the rate of steam extraction and rotation speed of impeller. The shape of impeller and the expected supercavitating effects it generates have been confirmed by experimental results at the rotation speed of 5430 rpm （round per minute）. The design of the steam extraction openings has been approved during the evacuation of steam. The experimental dependencies have been obtained in form of statistically valid regression equations, which can be used for engineering design of RSCE.

关键词： desalination cavitation technology thermal method steam extraction regression analysis

Effectiveness of Bilateral Pulmonary Artery Banding in Patients with Hypoplastic Left Heart Syndrome and Congenital Heart Defects with a Functional Single Ventricle: A Single-Center Retrospective Study

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Congenital Heart Disease 2022年第3期17卷 365-374页

作者： Vitaliy Suvorov vladimir Zaitcev Karolina Andrzejczyk Saint Petersburg State Pediatric Medical University Saint-PetersburgRussia Academisch Medisch Centrum Universiteit van Amsterdam AmsterdamNetherlands

Background:Bilateral banding of the branches of the pulmonary artery in patients with hypoplastic left heart syndrome(HLHS)and other duct dependent critical neonatal heart malformations can significantly reduce the incidence of severe complications in the postoperative period,especially in severely unstable *** our study we compared different surgical techniques of bilateral pulmonary artery banding(PAB)in respect to their success in balancing systemic and pulmonary blood ***:We included 44 neonates with a HLHS and congenital heart diseases(CHD)with a functional single ventricle underwent a hybrid operation:bilateral PAB and patent ductus arteriosus *** hybrid surgery for method No.1 is performed as a one-stage procedure,together with patent ductus arteriosus(PDA)*** median sternotomy,two Gore-Tex 1–2 mm wide bands with a diameter of 3–3.5 mm are *** we apply method No.2 then the thread is used to create *** No.3 is distinguished by intraoperative assessment of blood flow at the site of narrowing of the branches of the pulmonary artery and optional stenting of the *** cuff for banding is made of Gore-Tex *** when applying method Nos.1 and 2 is assessed by the change in invasive blood pressure and oxygen saturation after narrowing of the branches of the pulmonary ***,with these techniques PDA stenting by inserting the introducer via pulmonary artery trunk is ***:HLHS with mitral or aortic valve atresia or both was present in 19 patients(43.1%),with severe left heart obstruction resulting in PDA dependent systemic circulation in 16 babies(36.4%).CHD with single ventricle physiology occurred in 9 patients(20.5%).14 babies(31.8%)undergo the procedure following the method No.1,8 patients(18.2%)method No.2 and 22 patients(50%)method ***/Qs=1/1 was achieved in 30 patients(30/44,68.1%):as a result of the method No.1 was achieved in 5 patients(5/14,35.7%),method No.2 in 4 patien

关键词： Bilateral banding hybrid Norwood procedure pulmonary banding hybrid approach HLHS surgery single ventricle

Cementation Characteristics and Their Effect on Quality of the Upper Triassic, the Lower Cretaceous, and the Upper Cretaceous Sandstone Reservoirs, Euphrates Graben, Syria

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Journal of Earth Science 2021年第6期32卷 1545-1562页

作者： Ibrahem Yousef vladimir Morozov Vladislav Sudakov Ilyas Idrisov Institute of Geology and Petroleum Technologies Kazan Federal UniversityKazanRussia

This article presents the results of cementation characteristics and their effect on sandstone reservoir quality of the Upper Triassic Mulussa F, the Lower Cretaceous Lower Rutbah, and the Upper Cretaceous Post Judea Sandstone formations in selected fields in the Euphrates Graben area, Syria. This study emphasises the role of cementation in the evaluation of the diagenetic history of the sediments, developing effective porosity, as well as evaluation of reservoirs stimulation procedures and potential for formation damage of the sandstone reservoirs. Quartz cement is present as well developed tabular or pyramidal syntaxial overgrowths. Kaolinite cement is present as vermicular aggregates which are most abundant within sandstones of the Mulussa F Formation. Carbonate cements include siderite and dolomite. Four lithofacies were identified within the studied formations;lithofacies-1 and 2 correspond to fluvial depositional environments, lithofacies-3 and 4 correspond to fluvial to estuarine channel environments. The Post Judea Sandstone and the Lower Rutbah reservoir units are typically lithofacies-3 sequences in which quartz overgrowths are the dominant cement. Because the total cement is more extensive in the Post Judea Sandstone Formation than in the Lower Rutbah Formation, resulting in high porosity(up to 26%) and permeability(6 000 mD), the reservoir quality is predicted to be best in the Post Judea Sandstone Formation. The reservoir units in the Mulussa F Formation contain the highest cement volumes comprised of early siderite and kaolinite, which, with the development of compaction-resisting quartz overgrowths and resultant compactional pore volume loss, has resulted in typically lower porosity being preserved than in the Lower Rutbah and Post Judea Sandstone formations.

关键词： cementation diagenesis reservoirs quality Euphrates Graben Syria