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

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

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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

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Deuterium retention in chemically vapor deposited tungsten carbide coatings and hot-rolled tungsten exposed to low-energy deuterium plasma

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Tungsten 2022年第1期4卷 10-19页

作者： vladimir Kh.Alimov Joachim Roth Frumkin Institute of Physical Chemistry and Electrochemistry Russian Academy of SciencesMoscow 119071Russia Max-Planck-Institut fur Plasmaphysik 85748 GarchingGermany

Samples of chemically vapor deposited(CVD)coatings of tungsten carbides W_(45)C_(55)and W_(60)C_(40)and samples of hot-rolled tungsten were exposed to deuterium(D)plasma at sample temperatures ranging from 323 to 813 K,as a result of which the samples were irradiated with D ions with an energy of about 200 eV per D particle at a flux of D particles of about1.1×10^(21)D·m^(-2)·s^(-1)to a fluence of about 2×10^(24)D·m^(-2).The concentration of deuterium in these samples was examined by the D(3 He,p)4 He nuclear *** on the measured deuterium depth profiles and assuming that these profiles are determined by diffusing D atoms,the diffusion coefficients of deuterium in the CVD tungsten carbide coatings were *** these diffusion coefficients,an estimate of the Arrhenius relation for the diffusion coefficients of deuterium in CVD tungsten carbide coatings was obtained:D=2.5×10^(-3)exp(-1.12 eV/kT)m~2·s^(-1),where T is temperature expressed in Kelvin,and k is the Boltzmann *** concentration of trapped deuterium in the bulk of CVD tungsten carbide coatings is practically independent of the stoichiometry of the *** decreases from about 5×10^(-2)to about 7×10^(-4)D/(W+C)with an increase in the deuterium plasma exposure temperature from 373 to 813 *** concentration of trapped deuterium in hot-rolled tungsten,expressed in units of the D/W atomic ratio,is more than an order of magnitude lower than the concentration of deuterium in tungsten carbides,and also decreases with increasing plasma exposure temperature.

关键词： Chemically vapor deposited tungsten carbides Tungsten Deuterium plasma Deuterium depth profiles Deuterium diffusion coefficients

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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

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Temporal and spatial variations of air pollution across China from 2015 to 2018

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Journal of Environmental Sciences 2022年第2期34卷 161-169页

作者： Xiaoteng Zhou vladimir Strezov Yijiao Jiang Tao Kan Tim Evans ARC Research Hub for Computational Particle Technology Macquarie UniversitySydneyNew South Wales 2109Australia Department of Earth and Environmental Sciences Faculty of Science and EngineeringMacquarie UniversitySydneyNew South Wales 2109Australia School of Engineering Faculty of Science and EngineeringMacquarie UniversitySydneyNew South Wales 2109Australia

This study investigated concentrations of PM_(2.5),PM_(10),SO_(2),NO_(2),CO and O_(3),and air quality index(AQI)values across 368 cities in China's Mainland during 2015–*** study further examined relationships of air pollution status with local industrial capacities and vehicle *** correlations were found between industrial capacities(coal,pig iron,crude steel and rolled steel)and air pollution *** statistical and significant reductions of PM_(2.5),PM_(10),SO_(2),NO_(2),CO and AQI values were observed in response to various laws and regulations in industrial sectors,both particle and gaseous pollutants still had annual average concentrations above recommended *** order to further reduce air pollution,more efforts can be done to control traffic emissions caused by minicars and heavy trucks,which was revealed after investigating 16 vehicle *** was also consistent with the apparent air quality improvement during the COVID-19 lockdown period in China in 2020,despite industrial operations being still active at full capacities.

关键词： PM_(2.5) PM_(10) SO_(2) NO_(2) Industrial products Vehicle numbers

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Transient expression of inactive RB in mesenchymal stem cells impairs their adipogenic potential and is associated with hypermethylation of the PPARγ2 promoter

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Genes & Diseases 2022年第1期9卷 165-175页

作者： Mikhail Baryshev Nikolai Petrov vladimir Ryabov Boris Popov Institute of Cytology Russian Academy of Sciences St.Petersburg4Tikhoretsky Av.194064St.PetersburgRussia Institute of Microbiology and Virology Riga Stradins UniversityRatsupites 5LV-1067RigaLatvia Developmental Therapeutics Branch National Cancer InstituteNational Institutes of HealthBethesdaMaryland 20892USA

The retinoblastoma gene product(pRb)is a chromatin-associated protein that can either suppress or promote activity of key regulators of tissue-specific *** found that twelve weeks after transfection of the exogenous active(ΔB/X andΔр34)or inactive(ΔS/N)forms of RB into the 10T1/2 mesenchymal stem cells and clonal selection not a single cell line did contain exogenous RB,despite being G-418 ***,the consequences of the transient production of exogenous RB had different effects on the cell ***ΔB/X andΔр34 cells transfected with active form of RB showed elevated levels of inducible adipocyte differentiation(AD).On the contrary,theΔS/N cells transfected with inactive RB mutant were insensitive to induction of AD associated with abolishing of expression of the PPARγ***,the PPARγ2 promoter in undifferentiatedΔS/N cells was hypermethylated,but all except−60 position CpG became mostly demethylated after cells exposure to *** conclude that while transient expression of inactive exogenous RB induces long term epigenetic alterations that prevent adipogenesis,production of active exogenous RBs results in an AD-promoting epigenetic *** results indicate that pRb is involved in the establishment of hereditary epigenetic memory at least by creating a methylation pattern of PPARγ2.

关键词： Adipogenic differentiation DNA methyltransferase 1 Mesenchymal stem cells MSCs RB Retinoblastoma susceptibility gene

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Potential triggers for large earthquakes in open-pit mines:A case study from Kuzbass,Siberia

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Deep Underground Science and Engineering 2022年第2期1卷 101-115页

作者： Gevorg Kocharyan Chengzhi Qi Svetlana Kishkina vladimir Kulikov Sadovsky Institute for Dynamics of Geospheres of Russian Academy of Sciences MoscowRussia Civil and Transportation School Beijing University of Civil Engineering and ArchitectureBeijingChina

The extraction and movement of rock during mining operations is considered a possible trigger for slip along the *** this study,possible anthropogenic causes were analyzed for triggering the earthquake with the local magnitude ofML=6.1(at a depth of 4km just beneath the quarry),in the vicinity of the large coal open-pit mine in *** event was the largest earthquake associated with a quarry(an open pit).A sufficiently deep occurrence of the source testified that seismic vibrations were produced in a dynamic slip along a preexisting and prestressed tectonic *** calculations were conducted of increments of normal and shear stresses at fault planes with several dip angles at depths corresponding to the probable location of the hypocenter of the Bachat *** the results show,long-term rock excavations bring a prestressed thrust fault closer to the ultimate Coulomb strength,and stress variations at those depths may suffice to initiate a movement along the *** measuring seismic vibrations at different quarries and mines in Russia,the dynamic effect at the supposed depth of the source occurrence could be reliably *** is shown,the ultimate anticipated dynamic deformations are noticeably lower than corresponding values produced by seismic waves of distant earthquakes in the case when the effects of dynamic triggering were ***,the seismic effect of explosions cannot trigger a large earthquake with deep source *** in open-pit mines can only bring forward the moment of an earthquake at a potentially seismogenic *** the same time,the numerical calculations reveal that a branching network of underground tunnels located at several horizons can noticeably reduce the effective shear modulus of the host *** effect can even provoke a dynamic movement at a previously aseismic fault.

关键词： anthropogenic impact Coulomb stress variations fault induced seismicity mine seismicity open pits

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Prediction of segregation characterization based on granular velocity and concentration in rotating drum

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Particuology 2023年第2期73卷 17-25页

作者： Wenzheng Xiu Ra Li Quan Chen Qicheng Sun vladimir Zivkovic Hui Yang School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai200093China School of Medical Instrument and Food Engineering University of Shanghai for Science and TechnologyShanghai200093China State Key Laboratory of Hydroscience and Engineering Tsinghua UniversityBeijing100084China School of Engineering Newcastle UniversityNE17RUUnited Kingdom

In a binary granular system composed of two types of particles with different granule sizes and the same density,particle sorting occurs easily during the flow *** segregation pattern structure is mainly affected by the granular velocity and granular concentration in the flow *** paper reports on the experimental velocity and concentration measurement results for spherical particles in a quasi-two-dimensional rotating *** relationship between the granular velocity along the depth direction of the flow layer and granular concentration was established to characterize structures with different degrees of *** corresponding relationships between the granular velocity and concentration and the segregation pattern were further analyzed to improve the theoretical models of segregation(convection-diffusion model and continuous flow model)and provide a reference for granular segregation control in the production process.

关键词： Granular segregation Rotating drum Granular velocity Granular concentration

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Hidden symmetry operators for asymmetric generalized quantum Rabi models

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Chinese Physics B 2022年第1期31卷 320-323页

作者： Xilin Lu Zi-Min Li vladimir V Mangazeev Murray T Batchelor Department of Theoretical Physics Research School of PhysicsAustralian National UniversityCanberra ACT 2601Australia Mathematical Sciences Institute Australian National UniversityCanberra ACT 2601Australia Centre for Modern Physics Chongqing UniversityChongqing 40444China

The hidden Z2 symmetry of the asymmetric quantum Rabi model(AQRM)has recently been revealed via a systematic construction of the underlying symmetry *** on the AQRM result,we propose an ansatz for the general form of the symmetry operators for AQRM-related *** this ansatz we obtain the symmetry operator for three models:the anisotropic AQRM,the asymmetric Rabi–Stark model(ARSM),and the anisotropic ARSM.

关键词： light-matter interaction hidden symmetry asymmetric quantum Rabi model asymmetric Rabi-Stark model

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Translation and rotation of particles in different flow pattern areas of a silo

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Particuology 2023年第2期73卷 68-77页

作者： Ran Li Quan Chen Hongze Li Wenzheng Xiu vladimir Zivkovic Hui Yang School of Medical Instrument and Food Engineering University of Shanghai for Science and TechnologyShanghai200093China School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai200093China School of Engineering Newcastle UniversityNE17RUUnited Kingdom

The present paper reports the results obtained for translational and rotational velocity profiles of spherical particles for the mixed flow in a conical *** discrete element method(DEM)based on Hertz-Mindlin(no slip)with RVD rolling friction contact model is used for *** correlations are found between translational and rotational velocities in different flow areas of the *** particular,the abrasion caused by rotation is dominant in the funnel flow *** addition,increase of the mass flow rate of silo can effectively reduce the abrasion induced by *** highlights that understanding of dynamic characteristics of particles is helpful for optimization of silos and reduction of granular material abrasion.

关键词： Translational velocity Rotational velocity Rolling contribution rate Mass flow index

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