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An improved predictive-corrective incompressible smoothed particle hydrodynamics method for fluid flow modelling

Journal of Hydrodynamics 2019年第4期31卷 654-668页

作者： Chong Peng Christoph Bauinger kamil Szewc Wei Wu Hui Cao ESS Engineering Software Steyr GmbH Berggasse 35 4400 Steyr Austria Institut Jur Geotechnik Universitat jur Bodenkultur Feistmantelstrasse 4 1180 Vienna Austria

Predictive-corrective incompressible smoothed particle hydrodynamics (PCISPH) is an efficient SPH variation originally developed for computer graphics. Its application in modeling physics-focused fluid flows has not yet been reported. In this work, an improved PCISPH method is presented for physics-focused fluid flow modeling. Different from traditional weakly-compressible SPH (WCSPH) and incompressible SPH (ISPH), PCISPH satisfies the incompressibility requirement at the particle level without a predefined equation of state. The pressure is obtained using an iterative predictive-corrective scheme at each individual particle. The presented PCISPH allows much larger time steps compared with WCSPH. It also avoids the time-consuming solution of Pressure Poisson Equation (PPE) in ISPH. Consequently, the PCISPH has high computational efficiency even with millions of computational particles. To ensure physically correct modeling of fluid flows, we employ several techniques to enhance the accuracy and stability of the PCISPH:(1) the continuity equation is used to predict density, replacing the mass summation approach used in the original PCISPH,(2) numerical diffusion and pressure smoothing are introduced to improve the pressure computation,(3) a generalized boundary treatment approach which can handle arbitrarily complex geometries is employed,(4) an adaptive time-stepping algorithm is used, allowing efficient simulation as well as ensuring stability. The performance of the improved PCISPH is systematically investigated using three standard SPH validation cases. Comparisons between the improved PCISPH and the state-of-the-art 5 - SPH are presented. It is found that the improved PCISPH gives numerical results as accurate as J - SPH, except for having moderate temporal pressure oscillations. However, the numerical results show that the improved PCISPH is approximately five times faster than 8 -SPH. The improved PCISPH method shows to be a promising tool for large-scale thre

关键词： Smoothed particle hydrodynamics incompressibility predictive-corrective scheme high efficiency

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Analysis of the lifetime and culling reasons for AI boars

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Journal of Animal Science and Biotechnology 2017年第4期8卷 866-874页

作者： Damian Knecht Anna Jankowska-Maosa kamil Duziński Institute of Animal Breeding Wroclaw University of Environmental and Life SciencesChelmonskiego 38C51–630 WroclawPoland

Background: The aim of the study was to analyze the lifetime and culling reasons for boars used in insemination centers(AI centers).Methods: The data collected from 355 culled boars from 1998 to 2013 included: age at start of semen collection,boar herd life, culling reason, daily gain and lean meat content, and number of ejaculates not meeting sales requirements after dilution. Culling reasons were divided into 7 groups: low semen value(LSV), low or lack of libido(LL), leg problems(LP), infectious diseases(ID), old age(OA), reduced demand for semen from the given boar(RD),and others(OT).Results: The most common culling reasons for boars were LSV(23.7%) and RD(22.5%). It was observed that the lowest daily gains were noted in boars culled due to OA. Boars culled due to OA and RD were maintained in production for the longest time(over 1000 d), for LSV and ID retention was about 700 d, and due to LL below 400 d. The survival probability was over 0.9 until 1.5 yr, and just over 0.2 until 4 yr. The highest relative frequency was observed in the 36 ^(th) and 42 ^(nd) mo of life(over 16%). Hazard risk analysis revealed a more than 10 times higher risk of culling in the case of LL, ID or OT, in comparison to ***: The results can be used as a direct point of reference for the identification of emerging problems in AI boar exploitation and the development of an appropriate culling policy in AI centers.

关键词： AI centers Boars Culling Exploitation Management

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A non-lithographic plasma nanoassembly technology for polymeric nanodot and silicon nanopillar fabrication

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Frontiers of Chemical Science and Engineering 2019年第3期13卷 475-484页

作者： Athanasios Smyrnakis Angelos Zeniou kamil Awsiuk Vassilios Constantoudis Evangelos Gogolides Institute of Nanoscience & Nanotechnology NCSR “Demokritos”Ag. Paraskevi15341 AtticaGreece Department of Physics University of Patras26504 PatrasGreece M. Smoluchowski Institute of Physics Jagiellonian University30-348 KrakowPoland

In this work, we present plasma etching alone as a directed assembly method to both create the nanodot pattern on an etched polymeric (PMMA) film and transfer it to a silicon substrate for the fabrication of silicon nanopillars or cone-like nanostructuring. By using a shield to control sputtering from inside the plasma reactor, the size and shape of the resulting nanodots can be better controlled by varying plasma parameters as the bias power. The effect of the shield on inhibitor deposition on the etched surfaces was investigated by time-of-flight secondary ion mass spectroscopy (ToF-SIMS) measurements. The fabrication of quasi-ordered PMMA nanodots of a diameter of 25 nm and period of 54 nm is demonstrated. Pattern transfer to the silicon substrate using the same plasma reactor was performed in two ways:(a) a mixed fluorine-fluorocarbon-oxygen nanoscale etch plasma process was employed to fabricate silicon nanopillars with a diameter of 25 nm and an aspect ratio of 5.6, which show the same periodicity as the nanodot pattern, and (b) high etch rate cryogenic plasma process was used for pattern transfer. The result is the nanostructuring of Si by high aspect ratio nanotip or nanocone-like features that show excellent antireflective properties.

关键词： plasma nanoassembly etching nanodots nanopillars nanofabrication

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Negative-pressure pneumatic separator:a new solution for hard-coal beneficiation

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International Journal of Coal Science & Technology 2021年第1期8卷 103-123页

作者： kamil Stańczyk Andrzej Bajerski Marian J.Łączny Central Mining Institute Plac Gwarków 140-166KatowicePoland

Hard coal is an important source of energy *** to the imperfections of excavation technology,most run-of-mine coals must be processed before they can be utilised as *** this study,tests on the dry separation process were performed with numerous different raw hard coal and coal waste material samples,using a newly designed and constructed negative-pressure pneumatic separator(NPPS).The experiments revealed the effects of the feed-material properties and material processing *** experiments were preceded by additional tests for evaluating the influence of each device operating parameter on the process,to determine the optimal method of supplying the feed *** calorific value of the processed materials was improved by 5%–40%,while a minimal output yield of products(60%–70%)was *** trials indicated that in coal material processing,the developed NPPS can be used for not only raw coal enrichment but also coal recovery from materials stored at coal-waste *** main advantages of the device are its mobility,low material processing cost,and lack of water consumption during operation.

关键词： Dry coal beneficiation Coal enrichment Coal waste processing Aerodynamic separation Deshaling Negative-pressure system

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Fractal dynamics and computational analysis of local fractional Poisson equations arising in electrostatics

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Communications in Theoretical Physics 2023年第12期75卷 12-18页

作者： Jagdev Singh Hassan kamil Jassim Devendra kumar Ved Prakash Dubey Department of Mathematics JECRC UniversityJaipurRajasthanIndia Department of Mathematics Kyung Hee University26 Kyungheedae-roDongdaemun-guSeoul02447Republic of Korea Department of Computer Science and Mathematics Lebanese American UniversityBeirutLebanon Department of Mathematics Faculty of Education for Pure SciencesUniversity of Thi-QarNasiriyahIraq Department of Mathematics University of RajasthanJaipur-302004RajasthanIndia Faculty of Mathematical and Statistical Sciences Shri Ramswaroop Memorial UniversityBarabanki-225003Uttar PradeshIndia

In this paper,the local fractional natural decomposition method(LFNDM)is used for solving a local fractional Poisson *** local fractional Poisson equation plays a significant role in the study of a potential field due to a fixed electric charge or mass density *** examples with computer simulations are presented in this *** obtained results show that LFNDM is effective and convenient for application.

关键词： poisson equation local fractional natural transform adomian decomposition method local fractional derivative electrostatics fractal media

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Characterization and processing of talc-magnesite from the Zinelbulak deposit

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Mining Science and Technology 2010年第3期20卷 415-420,433页

作者： HOJAMBERDIEV Mirabbos ARIFOV Pulat TADJIEV kamil XU Yunhua New York State College of Ceramics Alfred University Alfred 14802 USA Institute of General and Inorganic Chemistry Uzbekistan Academy of Sciences Tashkent 100170 Uzbekistan Institute of Wear Resistance Material Xi'an University of Architecture and Technology Xi 'an 710055 China

The characteristics of talc-magnesite from the Zinelbulak deposit(Uzbekistan) were investigated via X-ray diffraction, differential thermal analysis,infrared spectroscopy and optical *** mineralogical composition of the Zinelbulak talc-magnesite consists of 52 wt.%talc,43 wt.%carbonates and 5 wt.%of the iron-containing minerals magnetite,siderite and *** analysis confirmed the presence of carbonates in two forms:magnesite and *** tests revealed that talc and magnesite particles are completely separated after a grinding process carried out for 10～12 *** distribution of the yield of talc and magnesite,as a function of the particle size,shows an irregular feature in that a comparatively coarser sample(>0.1 mm) is richer in magnesite and poor in talc while a comparatively finer sample(<0.1 mm) has a composition poorer in *** dressability of the Zinelbulak talc-magnesite was tested using conventional gravity concentration,flotation and electromagnetic *** concentration was found to be the most economic initial process for the complete separation of magnesium carbonate and *** flotation and magnetic separation techniques could further increase the yield of high quality magnesite and *** samples prepared by heating the separated magnesite at 1600℃for 2 h met the State Standards for refractory materials.

关键词： talc-magnesite grinding froth flotation gravity concentration magnetic separation

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Subcellular Localization and In Vivo Interactions of the Arabidopsis thaliana Ethylene Receptor Family Members

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Molecular Plant 2008年第2期1卷 308-320页

作者： Christopher Grefen Katrin Stadele kamil Ruzicka Petr Obrdlik Klaus Hatter Jakub Horak Zentrum fur Molekularbiologie der Pflanzen Pflanzenphysiologie Universitat Tubingen Auf der Morgenstelle 1 72076 Tubingen Germany Zentrum for Molekularbiologie der Pflanzen Entwicklungsgenetik Universit&t Tubingen Auf der Morgenstelle 3 72076 Tubingen Germany IonGate Biosciences GmbH Industriepark Hochst D 528 65926 Frankfurt am Main Germany

The gaseous phytohormone ethylene regulates many developmental processes and responses to environmental conditions in higher plants. In Arabidopsis thaliana, ethylene perception and initiation of signaling are mediated by a family of five receptors which are related to prokaryotic two-component sensor histidine kinases. The transient ex- pression of fluorescence-tagged receptors in tobacco （Nicotiana benthamiana） epidermal leaf cells demonstrated that all ethylene receptors are targeted to the ER endomembrane network and do not localize to the plasmalemma. In support of in planta overlay studies, the ethylene receptors form homomeric and heteromeric protein complexes at the ER in living plant cells, as shown by membrane recruitment assays. A comparable in vivo interaction pattern was found in the yeast mating-based split-ubiquitin system. The overlapping but distinct expression pattern of the ethylene receptor genes suggests a differential composition of the ethylene receptor complexes in different plant tissues. Our findings may have crucial functional implications on the ethylene receptor-mediated efficiency of hormone perception, induction of signaling, signal attenuation and output.

关键词： Subcellular Localization Vivo Interactions Arabidopsis thaliana Ethylene Receptor Family Members

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Comparative study of natural chemical for enhanced oil recovery: Focus on extraction and adsorption at quartz sand surface

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Petroleum 2023年第1期9卷 83-93页

作者： Azza Hashim Abbas Ramzi A.Abd Alsaheb Jaafar kamil Abdullah School of Mining and Geosciences Nazarbayev UniversityKazakhstan Al-khwarizmi College of Engineering University of BaghdadIraq Basrah University College of Science and Technology Iraq

In chemical enhanced oil recovery(CEOR),it is very important to utilize the excessive usage of chemicals.A great opportunity lies in adopting natural surfactants,since it is cheaper,ecosystem friendly,and less toxic than their counterpart synthetic *** the availability of natural surfactant sources,it is yet very early to decide on their ***,this research focuses on natural-saponin extracted from different raw materials available in the Middle East and their interaction with quartz-sand.A special focus was given to the adsorption isotherm models to describe the interaction with the reservoir *** raw materials were investigated are fenugreek,sugar beet leaves and *** main extraction method employed was the chemical extraction using the *** study used Uv–vis spectrometer to investigate the micellization behaviour and the consequent adsorption on *** presence of triterpenoid saponin is found dominant in all the sample,the intensity and purity differed according to the raw material *** critical micelle concentration(CMC)was at a close range of 4–5.5 wt%in all the *** highest adsorption was obtained by sugar beet leaves which is 192 g/*** is 25%and 37%higher than the Fenugreek and chickpeas,*** the salinity resulted in adsorption reduction between 2%and 56%.For the adsorption isotherms,it showed good agreement with the Langmuir model *** remarkable finding is that the sugar beet leaves heterogeneous model seems to be valid by Frendluich and Halsey isotherms.

关键词： Natural surfactants Quartz Adsorption isotherm Salinity Fenugreek Sugar beet leaves Chickpeas

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Mechanical Properties, Microstructure and Surface Quality of Polypropylene Green Composites as a Function of Sunflower Husk Waste Filler Particle Size and Content

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Journal of Renewable Materials 2021年第5期9卷 841-853页

作者： Mateusz Barczewski Jacek Andrzejewski Radomir Majchrowski kamil Dobrzycki Krzysztof Formela Poznan University of Technology Institute of Materials TechnologyPoznanPoland Poznan University of Technology Institute of Mechanical TechnologyPoznanPoland Gdansk University of Technology Department of Polymer TechnologyFaculty of ChemistryGabriela Narutowicza 11/12GdanskPoland

Agricultural waste is a still untapped source of materials that can,in case of proper utilization,significantly improve the sustainability of polymers and their *** this work,polymer composites based on isotactic polypropylene were produced incorporating ground sunflower husk in the amount of 10 wt%and 20 wt%.The work’s main objective is to evaluate how preliminary fractioning of this agricultural waste filler affects the thermomechanical properties,microstructure and surface topology of polypropylene-based injection molded compo*** composites were analyzed for mechanical properties(tensile,impact strength and hardness),thermomechanical properties(Vicat softening point VST,heat deflection temperature HDT,and dynamic thermomechanical analysis DMTA)with reference to morphological changes evaluated using scanning electron microscopy(SEM).The quality of the produced composites was assessed on the basis of the analysis of the surface topology of the injected *** has been shown that the larger particle size of used filler has a direct impact on increasing composite stiffness in the room and elevated ***,a relationship was demonstrated between the size of the filler and the deterioration of the tensile strength in the case of composites with a higher content of *** results show that the addition of sunflower husk as a particle-shaped waste filler is an effective method to increase sustainability of polypropylene-based green composites with beneficial thermomechanical properties and to reduce the residue of sunflower husk from industrial oil production.

关键词： Polypropylene sunflower husk green composite waste filler structure-property relationships

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Anti-pancreatic antibody in Turkish patients with inflammatory bowel disease and first-degree relatives

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World Journal of Gastroenterology 2010年第45期16卷 5732-5738页

作者： Huseyin Demirsoy kamil Ozdil Ozdal Ersoy Besir Kesici Cetin Karaca Canan Alkim Nihat Akbayir Levent kamil Erdem Mehmet Derya Onuk Hulya Tugrul Beyzadeoglu Department of Gastroenterology Sisli Etfal Training and Research Hospital34377 IstanbulTurkey Hulya Tugrul Beyzadeoglu Institute of Hygiene34020 IstanbulTurkey

AIM: To identify the role of anti-pancreatic antibody (PAB) in the diagnosis of inflammatory bowel diseases (IBD) among Turkish patients, and its frequency in firstdegree ***: PAB and anti-Saccharomyces cerevisiae (ASCA) were examined in serum samples of 214 subjects including patients with Crohn's disease (CD, n = 64), ulcerative colitis (UC, n = 63), first-degree relatives of patients with CD (n = 25), first-degree relatives of patients with UC (n = 28),and a control group with gastrointestinal symptoms other than (IBD) (n = 34) by indirect immunofluorescence Positivity of PAB and ASCA was compared in terms of Vienna classification, disease activity and medications ***: In terms of PAB positivity, no difference was found between patients with CD (14.1%) and UC (7.9%) however, significant difference was observed between patients with CD and subjects in the control group (P 150 (P < 0.05).CONCLUSION: PAB is valuable in the diagnosis of IBD rather than CD, but cannot be used alone for diagnostic purposes. PAB is not superior to ASCA in CD diagnosis and in detecting CD among relatives of patients with CD.

关键词： Anti-pancreatic antibody Anti-Saccharomyces cerevisiae antibody Crohn’s disease Ulcerative colitis Inflammatory bowel disease

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