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Статті в журналах з теми "Forming mixture"
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Cernat, Alexandru, Constantin Pana, and Niculae Negurescu. "Aspects of in-Cylinder Mixture Formation Study for a Diesel Engine Fuelled with LPG by Diesel-Gas Method." Applied Mechanics and Materials 809-810 (November 2015): 1043–48. http://dx.doi.org/10.4028/www.scientific.net/amm.809-810.1043.
Повний текст джерелаАнотація:
The Liquid Petroleum Gas can be use for diesel engine fuelling with significant result in term of pollutant emissions improvement, with important reduction of nitrous oxides and smoke for a LPG dual fuelled diesel engine. Beside this the LPG fuelling affects the combustion process inside the cylinder and also the mixture forming. High degree of homogeneity of the air-LPG mixtures will accelerate the in-cylinder mixture forming between air-LPG and diesel fuel jets, since the LPG-air mixture combustion starts. The paper presents the results of a zero-dimensional, one-zone thermodynamic model developed by authors for diesel fuel jets vaporization and combustion at dual fuelling. The model shows the diesel fuel jet characteristic, the break-up period, the mass flow of vaporized substance on the particle surface, drops vaporization time, air-fuel mixture forming speed, drops combustion time and flame position, showing a significant influence of LPG cycle dose on their characteristic parameters. The drops vaporization and combustion duration decrease for dual fuelling and the flame radius increases. Thus, based on the experimental data, an evaluation model for mixture forming was developed for an automotive diesel engine fuelled with LPG and diesel fuel by diesel-gas method.
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Vasková, I., M. Hrubovčáková, and M. Conev. "Influence of additives in core-forming mixture." Archives of Metallurgy and Materials 62, no. 1 (March 1, 2017): 335–38. http://dx.doi.org/10.1515/amm-2017-0050.
Повний текст джерелаАнотація:
Abstract In recent years, ingredients, also known as additives, which appreciably affect the quality of the casting surface, come to the fore. Additives - lower the temperature at which SiO2 (major component of silica sand) begins to soften and create a melt on the surface of the grains, increase the reactivity and decrease the temperature of a transition to tridimite and cristobalit. These passages support the increase of volume of subsurface sand stress and the tension for the formation of burrs and other casting defects on the surface of the core or the mold. Nowadays, as a great emphasis is put on the quality of the casts, it is therefore necessary to pay attention to these additives, which can effectively reduce the labor intensity in the production of castings and ensure a quality surface of castings.
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Wang, Xiushan, Hengyu Zhou, Xingxing Hu, Senjie Shen, and Bowen Dong. "Investigation of the Performance of Ceramic Fiber Modified Asphalt Mixture." Advances in Civil Engineering 2021 (February 11, 2021): 1–10. http://dx.doi.org/10.1155/2021/8833468.
Повний текст джерелаАнотація:
Ceramic fiber (CF) is a novel thermally resistant material with the potential to improve the high-temperature performance of asphalt mixture. In this study, asphalt mixtures with 0%, 0.1%, 0.2%, 0.3%, 0.4%, and 0.5% CFs were prepared. The Marshall test, wheel tracking test, Marshall immersion test, freeze-thaw splitting test, and low-temperature bending test were conducted to evaluate the performance of the CF-modified asphalt mixture. The morphologies of these asphalt mixtures were observed using scanning electron microscopy to analyze the modification mechanism. The results showed that the CFs could improve the mechanical properties, high-temperature stability, moisture susceptibility, and low-temperature cracking resistance of asphalt mixture, with the optimum CF content being 0.4%. Further microscopic analysis showed that the CFs improved the performances of asphalt mixture through forming three-dimensional network structure, asphalt absorption, bridging cracks, and pulling-out effect.
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Kang, Ai Hong, Qin Zhang, and Ping Li. "Research on the Influences of the Molding Processes of TOR Asphalt Rubber Mixtures upon the Pavement Performance." Advanced Materials Research 535-537 (June 2012): 1819–24. http://dx.doi.org/10.4028/www.scientific.net/amr.535-537.1819.
Повний текст джерелаАнотація:
It’s a chemical method that adding TOR into asphalt rubber to be TOR asphalt rubber mixture. In this study, 70# basic asphalt from Nanjing Jinling Company and 60 mesh waste rubber powder from Jiangyan Honglei Company were chosen for the SMA13 grading and SUP13 grading by the best preparation technology. The high temperature stability, anti-cracking performance and water stability of TOR asphalt rubber mixture were studied and the influence of dry and wet molding process on road performance of TOR asphalt rubber mixture was compared. The results show that both the dynamic stability and the low-temperature cracking performance of wet forming specimens are better than the dry process. The water stability of wet molding process is also slightly better than the dry process. And expansion rate tests were carried out on asphalt mixtures prepared by dry and wet forming processes on continuous gradation and discontinuous gradation to validate the applicability of discontinuous gradation to asphalt rubber.
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Ma, Liguo, Jinlong Yang, Lei Zhao, and Yong Huang. "Gelcasting of a rutile mixture applied to extrusion forming." Journal of the European Ceramic Society 22, no. 13 (December 2002): 2291–96. http://dx.doi.org/10.1016/s0955-2219(02)00005-5.
Повний текст джерела
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Akhmetov, A. B., D. M. Zhiyembayeva, A. V. D’yakov, V. I. Yablonskii, and A. N. Zolin. "New slag-forming mixture for ladle treatment of steel." Steel in Translation 47, no. 8 (August 2017): 554–56. http://dx.doi.org/10.3103/s0967091217080022.
Повний текст джерела
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Magazù, S., and F. Migliardo. "Fragility of Bioprotectant Glass-Forming Systems in Extremophiles." Journal of Atomic, Molecular, and Optical Physics 2009 (June 4, 2009): 1–9. http://dx.doi.org/10.1155/2009/638063.
Повний текст джерелаАнотація:
A central issue in the adaptation of proteins and enzymes to extreme conditions is the conservation of their functional state, which is characterized by a well-balanced compromise of stability and flexibility. In this review work an overview of elastic neutron scattering (ENS) findings on a class of bioprotectant glass-forming systems, such as trehalose and its homologous (maltose and sucrose) water mixtures, is presented as a function of temperature and concentration. ENS, in fact, allows to determine some remarkable quantities in order to characterize the correlation among dynamical properties, the flexibility and fragility of biomolecules. The experimental results have pointed out a dynamical transition, which shows a crossover in molecular fluctuations between harmonic and anharmonic dynamical regimes. The ENS findings allow to characterize both the trehalose rigidity and flexibility, which are strictly connected to its superior bioprotective effectiveness. In this frame the lowest flexibility and fragility character of trehalose/H2O mixture with respect to maltose and sucrose/H2O mixtures indicate a better attitude to encapsulate biostructures in more rigid and temperature insensitive structures in approaching the glass transition.
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Жулай, Владимир Алексеевич, Юрий Николаевич Спасибухов, and Алексей Николаевич Щиенко. "ECONOMIC JUSTIFICATION OF FORMING MACHINES SETS FOR ASPHALT-CONCRETE WORKS IN ROAD CONSTRUCTION." Housing and utilities infrastructure, no. 1(20) (March 14, 2022): 99–105. http://dx.doi.org/10.36622/vstu.2022.81.12.010.
Повний текст джерелаАнотація:
В статье рассмотрены вопросы, возникающие на этапе укладки асфальтобетонных смесей при строительстве автомобильной дороги. Приведены примеры организации и графика работы комплекта машин при укладке асфальтобетонной смеси на реальном объекте. Проведен анализ соотношения производительностей основных и вспомогательных машин и последствий от изменения их оптимального согласования. Предложены меры для обеспечения эффективной работы комплекта машин для укладки асфальтобетонной смеси. Сформулированы условия формирования комплекта машин для укладки асфальтобетонной смеси подрядной организации в современных экономических условиях. Их особенностью является необходимость включения в комплект машин, находящихся на балансе организации, даже если они не оптимальны по своим технико-экономическим характеристикам. The article deals with the issues that arise at the stage of laying asphalt concrete mixtures while constructing a highway. We describe examples of organization and work schedule of a set of machines when laying asphalt concrete mixture at a real facility. We carried out the analysis of the productivity ratio of the main and auxiliary machines and determined the consequences of changing their optimal balance. We offer some measures to ensure the normal operation of a set of machines for laying asphalt concrete mixture. As well we formulate the conditions for the formation of machines sets for laying asphalt concrete mixture by a contractor in modern economic conditions. The key feature of these conditions is the need to include into the set of machines those ones that are on the balance sheet of the contractor, even if they are not optimal in terms of their technical and economic characteristics.
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XIA, J. H., P. J. WANG, and C. S. LIU. "GRANULAR SPECIES SEGREGATION IN TILTED COMPARTMENTALIZED CONTAINER." International Journal of Modern Physics B 25, no. 28 (November 10, 2011): 3805–14. http://dx.doi.org/10.1142/s0217979211059036.
Повний текст джерелаАнотація:
The two-dimensional, soft-sphere molecular dynamics simulations have been performed to study the granular segregation behaviors in a binary granular mixture in tilted compartmentalized container under vertical vibration. It is found that there exist mixed state, left segregated state and right segregated state, which depend on the grain properties such as size ratio and density ratio as well as shaking properties. The particles with large density favor moving to right and the particles with large diameter prefer moving to left, so binary granular mixtures with large density ratio prefer forming right segregation state and the binary mixtures with large diameter favor forming left segregation state. The tilted compartmentalized container can be regarded as a container with a sawtooth base, which leads to stratified flows and thus forming horizontal segregation state under vertical vibration. The tilted bed plays a key role in forming segregation states, whereas the central wall enhances the segregation behaviors.
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Worku, Alemayehu, Tamás Tóth, Szilvia Orosz, Hedvig Fébel, László Kacsala, Balázs Húth, Richárd Hoffmann, Haruna Gado Yakubu, George Bazar, and Róbert Tóthi. "Aroma Profile, Microbial and Chemical Quality of Ensiled Green Forages Mixtures of Winter Cereals and Italian Ryegrass." Agriculture 11, no. 6 (May 31, 2021): 512. http://dx.doi.org/10.3390/agriculture11060512.
Повний текст джерелаАнотація:
The objective of this study was to evaluate the aroma profile, microbial and chemical quality of winter cereals (triticale, oats, barley and wheat) and Italian ryegrass (Lolium multiflorum Lam., IRG) plus winter cereal mixture silages detected with an electronic nose. Four commercial mixtures (mixture A (40% of two cultivars of winter triticale + 30% of two cultivars of winter oats + 20% of winter barley + 10% of winter wheat), mixture B (50% of two cultivars of winter triticale + 40% of winter barley + 10% of winter wheat), mixture C (55% of three types of Italian ryegrass + 45% of two cultivars of winter oat), mixture D (40% of three types of Italian ryegrass + 30% of two cultivars of winter oat + 15% of two cultivars of winter triticale + 10% of winter barley + 5% of winter wheat)) were harvested, wilted and ensiled in laboratory-scale silos (n = 80) without additives. Both the principal component analysis (PCA) score plot for aroma profile and linear discriminant analysis (LDA) classification revealed that mixture D had different aroma profile than other mixture silages. The difference was caused by the presence of high ethanol and LA in mixture D. Ethyl esters such as ethyl 3-methyl pentanoate, 2-methylpropanal, ethyl acetate, isoamyl acetate and ethyl-3-methylthiopropanoate were found at different retention indices in mixture D silage. The low LA and higher mold and yeast count in mixture C silage caused off odour due to the presence of 3-methylbutanoic acid, a simple alcohol with unpleasant camphor-like odor. At the end of 90 days fermentation winter cereal mixture silages (mixture A and B) had similar aroma pattern, and mixture C was also similar to winter cereal silages. However, mixture D had different aromatic pattern than other ensiled mixtures. Mixture C had higher (p < 0.05) mold and yeast (Log10 CFU (colony forming unit)/g) counts compared to mixture B. Mixture B and C had higher acetic acid (AA) content than mixture A and D. The lactic acid (LA) content was higher for mixture B than mixture C. In general, the electronic nose (EN) results revealed that the Italian ryegrass and winter cereal mixtures (mixture D) had better aroma profile as compared to winter cereal mixtures (mixture A and B). However, the cereal mixtures (mixture A and B) had better aroma quality than mixture C silage. Otherwise, the EN technology is suitable in finding off odor compounds of ensiled forages.
Дисертації з теми "Forming mixture"
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Буряк, Андрій Андрійович. "Розроблення технологічного процесу виготовлення чавунного виливка «Корпус», організація та планування формувального відділення ливарного цеху". Bachelor's thesis, КПІ ім. Ігоря Сікорського, 2021. https://ela.kpi.ua/handle/123456789/43671.
Повний текст джерелаАнотація:
Дипломний проект містить 92 стор., 22 табл., 10 рис., 8 посилань.
Об'єкт проектування – технологічний процес виготовлення виливка з
вуглецевої сталі «Корпус» масою 3,04 кг литтям у разові піщано-глинясті форми.
Предмет проектування – технологія ливарної форми та організація роботи
формувального відділення ливарного цеху.
Результатами проектування є розроблення технології ливарної форми для
заданого виливка, виконання технічного планування формувального відділення та
розрахунок одиниці ливарного устаткування.
Результати проектування – можуть бути рекомендовані на ливарних
підприємствах з подібним характером виробництва.
Галузь використання – підприємства машинобудування, військово промислового комплексу і т.п.Thesis project: pages, 22 tables, 10 figures, 9 references. The object of design - the technological process of manufacturing a carbon steel casting "Gearbox housing" weighing 3,04 kg by casting in disposable sand claymolds. The subject of design - the technology of the mold and the organization of the molding department of the foundry. Design results - the technology of the casting mold for a given casting is developed, the technical planning of the molding department and the calculation ofthe unit of the casting equipment are performed. Design results - can be recommended at foundries with a similar nature of production. Field of use - enterprises of agricultural engineering, military-industrial complex, etc.
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Басов, М. В. "Забезпечення екологічної безпеки ливарно-механічних виробництв". Thesis, Івано-Франківський національний технічний університет нафти і газу, 2014. http://elar.nung.edu.ua/handle/123456789/4666.
Повний текст джерелаАнотація:
Дисертаційна робота присвячена забезпеченню екологічної безпеки ливарно-механічних виробництв. Проведено аналіз джерел екологічної небезпеки ливарних виробництв та перспективних шляхів мінімізації їх негативного впливу на довкілля. Запропоновано стратегію створення екологічно безпечних та економічно виправданих формувальних сумішей, здатних до регенерації; для цих сумішей встановлено оптимальний склад та раціональну технологію їх використання та регенерації. Побудовано математичну модель руху потоків пилу в пиловловлювачі з жалюзійним відокремлювачем, який обертається, проведено аналіз картини руху потоків та визначено оптимальні параметри роботи апаратів. Створено комплект високоефективного пиловловлюючого обладнання для очищення повітря від дрібнодисперсного пилу в ливарно-механічних виробництвах, запропоновано конструкції пиловловлювачів, які захищені патентами України. Проведено комплексні експериментальні дослідження запропонованих пиловловлювачів на стенді, у результаті досліджень визначено раціональні параметри роботи пиловловлювачів із відокремлювачем, який обертається.Диссертационная работа посвящена обеспечению экологической безопасности литейно-механических производств. Проведен анализ источников экологической опасности литейных производств и перспективные пути минимизации их отрицательного влияния на окружающую среду. Предложена стратегия создания экологически безопасных и экономически оправданных формовочных смесей, способных к регенерации. С этой целью в состав смесей предложено вводить добавку гидроалюмосиликатов с определенной степенью дегидратации. С участием этой добавки и жидкого стекла, которое входит в состав смеси, образуется кристаллическая фаза, которая не спекается с зернами песка. Поэтому песок в классификаторе может отделяться от отработанных форм и использоваться для создания новых формовочных смесей. В качестве такой добавки предложен многотоннажный отход промышленности огнеупоров - шамотнокаолиновая пыль. Установлен оптимальный состав формовочных смесей и рациональная технология их использования и регенерации. Для уменьшения загрязнения атмосферы тонкодисперсной пылью -сконденсированными частицами оксидов металлов, - которые используются в литье, предложено использовать пылеуловители с вращающимся жалюзийным отделителем, в котором реализуются 4 степени очистки: центробежная очистка пылегазового потока после входа его в аппарат аналогично циклону; расположение жалюзийного пылеотделителя коаксионно оси корпуса аппарата как второй степени очистки; определенная форма жалюзи пылеотделителя как третьей степени очистки и доочистка газовой смеси от мелкодисперсной пыли за счет определенным образом организованного вращения жалюзийного пылеотделителя. Построена математическая модель движения потоков пыли в пылеуловителе с жалюзийным отделителем, который вращается, анализ которой позволил определить оптимальное направление вращения жалюзийного пылеотделителя - навстречу движению газового потока во входном отверстии с угловой скоростью 5 рад/с. Проведен анализ картины движения потоков и определены оптимальные параметры работы аппаратов. Создан комплект высокоэффективного пылеулавливающего оборудования для очистки воздуха от мелкодисперсной пыли в литейно-механических производствах; предложенные конструкции пылеуловителей защищены патентами Украины. Проведены комплексные экспериментальные исследования предложенных пылеуловителей на стенде, в результате исследований определены рациональные параметры работы пылеуловителей с отделителем, который вращается. Разработанные конструкции внедрены на ООО «Литейно-механический завод «Веста». Результаты исследований подтвердили эффективность разработок и перспективность их применения для обеспечения экологической безопасности литейных производств.
The dissertation deals with providing of ecological safety of foundry-mechanical industries. The analysis of sources of ecological dangeries of foundry-mechanical industries and promising ways of their dangerous influence minimization on the environment were observed. The strategy of creating ecologically safe and economically proved forming mixtures, possible for regeneration were supposed. Optimal structure , effective technology of usage and regeneration were determined. The mathematical model of dust stream movement in dust collector with stirred jalousie separator, the analysis of flow movement and optimum parameters of apparatus work were developed. A complete set of high-effective dustcollective apparatus for air cleaning from fme-dyspersated dust in foundry-mechanical industries and constructions of dust collectors protected by Ukrainian patents were supposed. Complex experimental investigations of supposed dust collectors on test bench were implemented. As a result of investigations rational parameters of dust collectors work with stirred separator were determined.
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Дегерменджі, Анастасія Всеволодівна. "Ливарний комплекс АТ ”Полтавський турбомеханічний завод” з розробкою технології лиття". Master's thesis, Київ, 2018. https://ela.kpi.ua/handle/123456789/26676.
Повний текст джерелаАнотація:
Об’єкт проектування – чавуноливарний цех з розробленням технологічних процесів виготовлення виливків різної маси литтям у разові піщано-глинясті форми.
Метою проекту є визначення технологічних параметрів та складання опису виробництва виливка; розроблення і обґрунтування етапів приготування рідкого сплаву; технологічне планування і проектування ливарного цеху.
Розроблений технологічний процес виготовлення виливка може бути рекомендований як типовий при виробництві чавуних виливків середньої складності в умовах дрібносерійного і великосерійного виробництва.
Попередніми розрахунками економічних показників прийнятих проектних рішень установлено економічну доцільність використання запропонованих процесів.
Розроблено організаційну схему роботи ливарного цеху та заходи, спрямовані на усунення небезпечних та шкідливих чинників.The design object is an iron foundry with the development of technological processes for the production of castings of various masses by casting into one-off sand-clay forms. The aim of the project is to determine the technological parameters and compile a description of the production of the casting; development and justification of the stage of preparation of the liquid alloy; technological planning and design of a foundry. The technological process of casting manufacturing has been developed can be recommended as typical for the production of iron castings of medium complexity in small-scale and large-scale production. Preliminary calculations of the economic indicators of the adopted design decisions established the economic feasibility of using the proposed processes. An organizational chart of the foundry’s work and measures aimed at eliminating dangerous and harmful factors have been developed.
Объект проектирования - чугунолитейный цех с разработкой технологических процессов изготовления отливок различной массы литьем в разовые песчано-глинистые формы. Целью проекта является определение технологических параметров и составления описания производства отливки; разработка и обоснование этапе приготовлении жидкого сплава; технологическое планирование и проектирование литейного цеха. Разработан технологический процесс изготовления отливки может быть рекомендован как типичный при производстве чугунных отливок средней сложности в условиях мелкосерийного и крупносерийного производства. Предварительным расчетам экономических показателей принятых проектных решений установлено экономическую целесообразность использования предложенных процессов. Разработана организационная схема работы литейного цеха и меры, направленные на устранение опасных и вредных факторов.
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Karásek, Michal. "Diagnóza Parkinsonovy choroby z řečového signálu." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-218976.
Повний текст джерелаАнотація:
The thesis deals with the recognition of Parkinson's disease from the speech signal. The first part refers to the principles of speech signals and speech signals by patients suffering from Parkinson's disease. Further, it continues to describe the issues of speech signals processing, basic symptoms used for diagnosis of Parkinson's disease (e. g. VAI, VSA, FCR, VOT etc.) and reduction of these symptoms. The next part focuses on a block diagram of the program for the diagnosis of Parkinson's disease. The main objective of this thesis is comparison of two methods of feature selection (mRMR and SFFS). For classification have selected two different methods were used. The first method is classification kNN and second method of classification is Gaussian mixture model (GMM).
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Breidenich, Jennifer L. "Impact-initiated combustion of aluminum." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54403.
Повний текст джерелаАнотація:
This work focuses on understanding the impact-initiated combustion of aluminum powder compacts. Aluminum is typically one of the components of intermetallic-forming structural energetic materials (SEMs), which have the desirable combination of rapid release of thermal energy and high yield strength.
Aluminum powders of various sizes and different levels of mechanical pre-activation are investigated to determine their reactivity under uniaxial stress rod-on-anvil impact conditions, using a 7.62 mm gas gun. The compacts reveal light emission due to combustion upon impact at velocities greater than 170 m/s. Particle size and mechanical pre-activation influence the initiation of aluminum combustion reaction through particle-level processes such as localized friction, strain, and heating, as well as continuum-scale effects controlling the amount of energy required for compaction and deformation of the powder compact during uniaxial stress loading. Compacts composed of larger diameter aluminum particles (~70µm) are more sensitive to impact initiated combustion than those composed of smaller diameter particles. Additionally, mechanical pre-activation by high energy ball milling (HEBM) increases the propensity for reaction initiation.
Direct imaging using high-speed framing and IR cameras reveals light emission and temperature rise during the compaction and deformation processes. Correlations of these images to meso-scale CTH simulations reveal that initiation of combustion reactions in aluminum powder compacts is closely tied to mesoscale processes, such as particle-particle interactions, pore collapse, and particle-level deformation. These particle level processes cannot be measured directly because traditional pressure and velocity sensors provide spatially averaged responses. In order to address this issue, quantum dots (QDs) are investigated as possible meso-scale pressure sensors for probing the shock response of heterogeneous materials directly. Impact experiments were conducted on a QD-polymer film using a laser driven flyer setup at the University of Illinois Urbana-Champaign (UIUC). Time-resolved spectroscopy was used to monitor the energy shift and intensity loss as a function of pressure over nanosecond time scales. Shock compression of a QD-PVA film results in an upward shift in energy (or a blueshift in the emission spectra) and a decrease in emission intensity. The magnitude of the shift in energy and the drop in intensity are a function of the shock pressure and can be used to track the particle scale differences in the shock pressure. The encouraging results illustrate the possible use of quantum dots as mesoscale diagnostics to probe the mechanisms involved in the impact initiation of combustion or intermetallic reactions.
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Staněk, Miroslav. "Určování stresu z řečového signálu." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-255289.
Повний текст джерелаАнотація:
Předložená disertační práce se zabývá vývojem algoritmů pro detekci stresu z řečového signálu. Inovativnost této práce se vyznačuje dvěma typy analýzy řečového signálu, a to za použití samohláskových polygonů a analýzy hlasivkových pulsů. Obě tyto základní analýzy mohou sloužit k detekci stresu v řečovém signálu, což bylo dokázáno sérií provedených experimentů. Nejlepších výsledků bylo dosaženo pomocí tzv. Closing-To-Opening phase ratio příznaku v Top-To-Bottom kritériu v kombinaci s vhodným klasifikátorem. Detekce stresu založená na této analýze může být definována jako jazykově i fonémově nezávislá, což bylo rovněž dokázáno získanými výsledky, které dosahují v některých případech až 95% úspěšnosti. Všechny experimenty byly provedeny na vytvořené české databázi obsahující reálný stres, a některé experimenty byly také provedeny pro anglickou stresovou databázi SUSAS.
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Yang, Sheng-fan, and 楊勝帆. "The study of mixture for municipal sewage sludge with the ceramic tile polishing waste to be reused by forming the lightweight aggregates." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/38561262925950830412.
Повний текст джерелаАнотація:
碩士國立聯合大學
環境與安全衛生工程學系碩士班
96
Accompanying with urban and civilization development, people environmental protection consciousness gains highly attention. Government side focus on river water quality improvement and constructing the sewerage system in recent years, the sewage sludge increased accordingly. The sanitary landfill for sludge increased the environment loading. To study the waste reused method for sludge is very urgent. This research focuses on the forming characteristics at high tempera‐ture for city sewage sludge and the ceramic tile polishing powder waste. These two materials at the weighting ratio of 10%, 30%, 50%, and 70% separately at the temperature of 1,050℃, 1,075℃, 1,100℃, 1,125℃, at various times at holding temperatures for 5min, 10min, 20min were tested. The results showed that the mixture of different sewage sludge and the ceramic tile polishing powder waste produced lightweight aggregate for the density less than 1.60 g/cm3, at the temperature of 1,125℃, the sewage sludge and time were controlled at 0%-20min, 10%‐10min/20min, 30% -5min/10min/20min,50%-5min/10min/20min and 70%‐5min/10min/20 min separately。It also showed that the water ratio increased can reduce the lightweight aggregate density and save energy required. Sludge added to form light aggregate at the conditions of sintering temperature 1,125℃, 10min and occupied 30% ratio were used for producing concrete materials. The results showed that the lightweight aggregate concrete units was 1,760 kg/m3, 28days Compressive strength was 532 kgf/cm2, comparing with ASTM C330 structural lightweight concrete strength of 280 kgf/m2, showed this sintered lightweight aggregate has a higher strength characteristics and shows its excellent quality.
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Barman, Nilkanta. "Studies On Transport Phenomena During Solidification In Presence Of Electromagnetic Stirring." Thesis, 2008. http://hdl.handle.net/2005/771.
Повний текст джерелаАнотація:
In several applications of casting, dendritic microstructure is not desirable as it results in poor mechanical properties. Enhancing the fluid flow in the mushy zone by stirring is one of the means to suppress this dendritic growth. The strong fluid flow detaches the dendrites from the solid-liquid interface and carries them into the mold to form slurry. The detached dendrites coarsen in the slurry and form into rosette or globular particles based on processing conditions. This slurry offers less resistance to flow even at a high solid fraction and easily flow into the die-cavity. The above principle is the basis of a new manufacturing technology called “semi-sold forming” (SSF), in which metal alloys are cast in the semi-solid state. This technique has several advantages over other existing commercial casting processes, such as reduction of macrosegregation, reduction of porosity and low forming efforts.
A major challenge existing in semisolid manufacturing is the production of metallic slurry in a consistent manner. The main difficulty arises because of the presence of a wide range of process parameters affecting the quality of the final product. An established method of producing slurry is by stirring the alloy using an electromagnetic stirrer. From an elaborate review of literature, it is apparent that solidification in presence of electromagnetic stirring involves a wide range of shear and cooling rates variation. However, the CFD models found in the literature are generally not based on accurate rheological properties, which are known to be functions of the relevant process parameters. Hence, there is a clear need for a comprehensive numerical model for such a solidification process, involving accurate rheological data for the semisolid slurry subjected to a range of processing conditions. The objective of the present work is to develop a numerical model for studying the transport phenomena during solidification with linear electromagnetic stirring. The study is presented in the context of a billet making process in a cylindrical mould using linear electromagnetic stirring. The mould consists of two parts: the upper part of the mould is surrounded by a linear electromagnetic stirrer forming the zone of active stirring, and the lower part of the mould is used to cool the liquid metal. The material chosen for the study is Al-7.32%Si (A356) alloy, commonly used for die casting applications.
A complete numerical model will therefore have two major components: one dealing with rheological behavior of the semisolid slurry, and the other involving macroscopic modeling of the process using computational fluid dynamics (CFD) techniques. For the latter part of the model, determination of rheological behavior of the slurry is a pre-requisite. The rheological characteristics of the stirred slurry, as a function of shear rate and cooling rate, is determined experimentally using a concentric cylinder viscometer. Two different series of experiments are performed. In the first series, the liquid metal is cooled at a constant cooling rate and sheared with different shear rates to get the effect of shear rate on viscosity. In the second series of experiments, the liquid metal is cooled at different cooling rates and sheared at a constant shear rate to obtain the effect of cooling rate on viscosity. During all these experiments, the shear rate is calculated from the measured angular velocity of spindle using inductive position sensor; viscosity of the slurry is calculated based on the torque applied to the slurry and angular velocity of the spindle; and the solid fraction is calculated from measured temperature of the slurry based on Schiel equation. From these data, a constitutive relation for variable viscosity is established, which is subsequently used in a numerical model for simulating the transport phenomena associated with the solidification process. The numerical model uses a set of single-phase governing equations of mass, momentum, energy and species conservation. The set of governing equations is solved using a pressure based finite volume technique, along with an enthalpy based phase change algorithm. The numerical simulation of this process also involves modeling of Lorentz force field.
The numerical study involves prediction of temperature, velocity, species and solid fraction distribution. First, studies are performed for a base case with a moderate stirring intensity of 250A primary current and 50 Hz frequency. It is found that the electromagnetic forces have maximum values near the mould periphery, which results in an ascending movement of the slurry near the mould periphery. Because of continuity,
this slurry comes down along the axis of the mould. Stirring produces a strong fluid flow which results good mixing in the melt. Correspondingly, a homogenized temperature distribution is found in the domain. Because of strong stirring, the solid fraction in the slurry is found to be distributed almost uniformly. It is also found that fragmentation of dendrites increases solid fraction in the slurry with processing time. During processing, the continuous rejection of solute makes the liquid progressively solute enriched. It is predicted from the present study that the remaining liquid surrounding the primary solid phase finally solidifies with a near-eutectic composition, which is desirable from the point of view of semisolid casting. Correspondingly, a set of experiments are performed to validate the numerically predicted results. The numerical predictions of temperature variations are in good agreement with experiments, and the predicted flow field evolution correlate well with the microstructures obtained through experiments at various locations, as observed in the numerical results.
Subsequently the study is extended to predict the effect of process parameters such as stirring intensity and cooling rate on the distributions of solid fraction and solute in the domain. It is found, from the simulation, that the solidification process is significantly affected by stirring intensity. At increasing primary excitation current, the magnitude of Lorentz force increases and results in increase of slurry velocity. Correspondingly, the fragmentation of dendrites from the solid/liquid is more during solidification at higher stirring intensity, which increases the fraction of solid in the slurry to a high value. It is also found that the solute and fraction of solid in the liquid mixes well under stirring action. Thus, a near uniform distribution of solute and solid fraction is found in the domain. It is found that stirring at high currents produces high solid fraction in the liquid. Also, at very low cooling rate, the solid fraction in the liquid increases.
The present study focuses on the model development and experimental validation for solidification with linear electromagnetic stirring for producing a rheocast billet. Further studies highlighting the effects of various process parameters on the thermal history and microstructure formation are also presented.
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Chao, Ming-Chi, and 趙明琪. "High-Pressure and Concentration-Dependent Studies on C-H---O Interactions of Binary Aqueous Mixture: Formic acid/D2O and Acetone/D2O." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/08494767161949126690.
Повний текст джерелаАнотація:
碩士國立東華大學
化學研究所
89
The C－H----O interactions of formic acid and acetone aqueous solutions were studied under various concentrations. The infrared spectra of acetone / D2O were also measured as a function of pressure. The C－H stretching frequency of formic acid reveals a red-shift with dilution. On the other hand, upon diluting acetone with D2O, the blue-shift with dilution in C－H stretching frequency was observed. Further high-pressure study provides the experimental evidence for the enhancement ices while C－H vibration of acetone, being transformed from liquid to high pressure ice Ⅶ, are altered into a band locate at ∼2950 cm－1. The C－H----O interaction may be a distinct possibility to understand the band-shape and frequency-shift of the C－H stretchingmodes of formic acid / D2O and acetone / D2O.
Частини книг з теми "Forming mixture"
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Mierzwa, M., M. Paluch, S. J. Rzoska, J. Zioło, and U. Maschke. "Ordering effect on dynamics in glass-forming mixture of liquid crystals." In Soft Matter under Exogenic Impacts, 201–14. Dordrecht: Springer Netherlands, 2007. http://dx.doi.org/10.1007/978-1-4020-5872-1_13.
Повний текст джерела
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Rubinstein, Lev, and Abraham Levy. "On Crystalization of a Binary Alloy Capable of Forming a Eutectic Mixture." In Structure and Dynamics of Partially Solidified Systems, 201–28. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3587-7_12.
Повний текст джерела
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Yeh, George C. "Solute Transfer in Zone Refining of Eutectic-Forming Mixtures." In ACS Symposium Series, 230–50. Washington, DC: American Chemical Society, 1990. http://dx.doi.org/10.1021/bk-1990-0438.ch017.
Повний текст джерела
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Wohlfarth, Christian. "Viscosity of formic acid." In Viscosity of Pure Organic Liquids and Binary Liquid Mixtures, 29. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49218-5_27.
Повний текст джерела
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Winkelmann, J. "Diffusion of formic acid (1); air (2)." In Gases in Gases, Liquids and their Mixtures, 794. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-49718-9_516.
Повний текст джерела
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Wohlfarth, Ch. "Viscosity of the mixture (1) formic acid; (2) formamide." In Supplement to IV/18, 1009–10. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75486-2_567.
Повний текст джерела
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Winkelmann, J. "Diffusion of formic acid ethyl ester (1); air (2)." In Gases in Gases, Liquids and their Mixtures, 943. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-49718-9_643.
Повний текст джерела
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Winkelmann, J. "Diffusion of formic acid ethyl ester (1); nitrogen (2)." In Gases in Gases, Liquids and their Mixtures, 947. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-49718-9_647.
Повний текст джерела
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Winkelmann, J. "Diffusion of formic acid propyl ester (1); air (2)." In Gases in Gases, Liquids and their Mixtures, 992. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-49718-9_691.
Повний текст джерела
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Winkelmann, J. "Diffusion of formic acid isobutyl ester (1); air (2)." In Gases in Gases, Liquids and their Mixtures, 1041. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-49718-9_739.
Повний текст джерелаТези доповідей конференцій з теми "Forming mixture"
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Nabieva, I. A., M. Sh Khasanova, and M. T. Kulakhmetova. "Forming nitron fiber in a mixture with natural silk protein." In INTERNATIONAL CONFERENCE ON TEXTILE AND APPAREL INNOVATION (ICTAI 2021). AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0077541.
Повний текст джерела
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Du, S. W., N. N. Thadhani, Mark Elert, Michael D. Furnish, William W. Anderson, William G. Proud, and William T. Butler. "IMPACT INITIATION OF PRESSED AL-BASED INTERMETALLIC-FORMING POWDER MIXTURE COMPACTS." In SHOCK COMPRESSION OF CONDENSED MATTER 2009: Proceedings of the American Physical Society Topical Group on Shock Compression of Condensed Matter. AIP, 2009. http://dx.doi.org/10.1063/1.3295176.
Повний текст джерела
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Blein, F., and A. Freslon. "Plasma Spray Forming of Free Standing W-AI Functionally Graded Materials." In ITSC 1998, edited by Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p1259.
Повний текст джерелаАнотація:
Abstract The aim of this study is to perform free standing materials which density varies continuously from 2,2 to 17,3 g/cm3 through a total thickness of 4,5 mm. In order to reach material optimal performances, it is necessary to determine specific mixture laws taking into account the combination of the different materials in a same plasma jet. A relationship integrating the deposition efficiency, the powder feed-rate, the density of the single sprayed materials, has been established to predict the result of the combination in terms of density, thickness and deposition efficiency. The good agreement of the mixture laws with the experiments allows to build up coatings with a parabolic density profile keeping layer thickness constant.
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Thakur, D. C., Jalim Singh, and Prasanth P. Jose. "Role of mean force field in dynamics of glass forming binary mixture with and without attractive interactions." In DAE SOLID STATE PHYSICS SYMPOSIUM 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0017303.
Повний текст джерела
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Wang, Hao, Bo Li, Zongyue Fan, and Xiaobai Li. "Numerical Modeling of the Hot Forming Process of Composite Materials." In ASME 2019 14th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/msec2019-2977.
Повний текст джерелаАнотація:
Abstract We present a fully coupled thermomechanical simulation of the hot forming process of composite materials. The raw material is a mixture of resin powders, strengthening particles and reinforcing fibers. Complex material responses in the process, such as phase change (melting and polymerization) and reorientation of the fibers, determine the microstructure and the performance of the final product. A phase-aware incremental mesh-free Lagrangian method is presented to overcome the challenges, which combines the Optimal Transportation Meshfree (OTM) method and the variational thermomechanical constitutive updates, and simulation results including the compression ratio, material properties of the final product and orientation distribution of fibers are recorded. By comparing the simulation results with the experimental measurements, the computational framework is validated, which enables robust and efficient analysis of the sensitivity of the performance of composite materials on their processing parameters.
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Kabir, M. A., C. F. Higgs, and M. Lovell. "Development of a Novel Green Lubricant for Sheet Metal Forming Operation." In ASME/STLE 2007 International Joint Tribology Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ijtc2007-44289.
Повний текст джерелаАнотація:
The main purpose of the present investigation is to analyze a novel, green, and petroleum-free lubricant that is produced by mixing two environmentally benign components—canola oil and boric acid powder. To study the influence of boric acid crystal size and volume ratio on the proposed lubricants performance, computerized pin on disk experiments were conducted with spherical copper pins (radius 6.5 mm) and aluminum disks (Ra = 1.35μm). Friction coefficient measurements were taken at more than twenty distinct operating conditions while varying the lubrication condition (unlubricated, boric acid, canola oil, boric acid/canola oil mixture), boric acid volume fraction (3.5%, 7%, 10.5 and 21%), and boric acid crystal size (0–100 microns, 100–150 microns, 150–180 microns, 180–350 microns and 350–710 microns). Based on the experiments, it was determined that a 7% by volume boric acid powder in canola oil with 350–700 micron particles was the optimum green lubricant for minimizing the friction at the conditions tested. In addition, the results indicated that the boric acid/canola oil lubricant demonstrated excellent potential for use in industrial applications such as sheet metal stamping.
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Parasumanna, Ajeet. "Bimetal Mixture Forging Process and Its Influence on Intermetallic Phase Seam Properties for An Automotive Component." In FISITA World Congress 2021. FISITA, 2021. http://dx.doi.org/10.46720/f2020-mml-052.
Повний текст джерелаАнотація:
In today’s scenario, the fuel cost and stricter norms related to environmental protection are exponentially increasing and thus lightweight forging is gaining importance which directly enhances the efficiency of the entire vehicle leading to reduction in pollution and fuel consumption. Material substitution with lighter alloy is one of the solutions but the part design is a constraint to implement this approach in structural load bearing parts which undergoes dynamic loading in its lifecycle. Mixture forging is a solid / Semi solid hot-forming process of two different materials while plastic deformation occurs. In mixture forging of steel-aluminum parts there is a formation of intermetallic phases and the diffusion occurs between two materials. This paper is addressing the challenges in forging process and especially producing bimetal product by adapting to currently followed forging practices and infrastructure. In this study, a component forging process is designed using finite element computation tool and then forged in two stages followed by application of mixture forging concept during forging operation to achieve light weighting. The two different materials used are 42CrMo4 steel for high strength at the outer case and AA6061 aluminium alloy for a lightweight core. The thickness of the intermetallic phase seam achieved is less than 10 μm and its material characterisation is carried out using SEM analysis. Micro-hardness measurement was taken of the intermetallic phase and is found to be 855 (HV 0.01) which is brittle in nature. The component thus forged is found to be 27% lighter than the component produced by steel forging. This technology is a part of the multi material joining technology using forging process wherein conventional equipment can be used. The bulk forming process achieving multi material solution is a innovative process and can lead to lighweighting of various circular parts and shaft primarily in the transmission of ICE and Electric Vehicles.
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Ninan, Chinnu Mariam, K. P. Ramaswamy, and R. Sajeeb. "Influence of Concrete Mixture Composition on Acid Resistance of Concrete: A Review." In International Web Conference in Civil Engineering for a Sustainable Planet. AIJR Publisher, 2021. http://dx.doi.org/10.21467/proceedings.112.53.
Повний текст джерелаАнотація:
Cementitious materials are highly susceptible to rapid and severe degradation by a wide range of acids that are found immensely in ground water, sewage systems, industrial effluents, acid rain etc. which may cause microstructure deterioration. The factors influencing acid attack is generally categorised as material related factors and test related factors. Material related factors can be either related to acid solution or concrete mixture composition. Composition of concrete mixture greatly impacts the acid resistance of concrete. Factors related to composition of concrete mixture are type of cement, type and proportion of binders, water binder ratio, aggregate binder ratio and mineralogical nature of the aggregates. Even though the type of cement influences acid attack, the magnitude of variation is negligible. Consumption of calcium hydroxide and refinement of pore structure makes the use of supplementary cementitious materials favourable for acid resistance. Decrease in water binder ratio and increase in aggregate binder ratio reduces the porosity of concrete and thereby improves the acid resistance of concrete. Calcareous aggregates are preferred for concretes exposed to acids having less soluble salts and not preferred for acids forming soluble salts. This paper highlights the influence of composition of concrete mixture on acid resistance of concrete. A proper formulation of concrete is expected to enhance its acid resistance.
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Musu, E., R. Rossi, and R. Gentili. "Improvements in Efficiency and Mixture Formation for an Innovative Diesel HCCI Concept." In ASME 2009 Internal Combustion Engine Division Fall Technical Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/icef2009-14046.
Повний текст джерелаАнотація:
Homogeneous-charge, compression-ignition (HCCI) combustion is triggered by spontaneous ignition in dilute homogeneous mixtures. The combustion rate must be reduced by suitable solutions such as high rates of Exhaust Gas Recirculation (EGR) and/or lean mixtures. HCCI is considered to be a very effective way to reduce engine pollutant emissions, however only a few production engines have been built. HCCI combustion currently cannot be extended to the whole engine operating range, especially to high loads, since the use of EGR displaces air from the cylinder, limiting engine mean effective pressure, thus the engine must be able to operate also in conventional mode. This paper concerns a study of an innovative concept to control HCCI combustion in diesel-fueled engines. The concept consists in forming a pre-compressed homogeneous charge outside the cylinder and in gradually admitting it into the cylinder during the combustion process. In this way, combustion can be controlled by the transfer flow rate, and high pressure rise rates, typical of standard HCCI combustion, can be avoided. This new combustion concept has been called Homogenous Charge Progressive Combustion (HCPC). This paper concerns CFD analysis focused on improving efficiency and reducing pollutant emissions considering a new HCPC engine configuration. Results show an indicated efficiency around 45% and a consistent reduction of soot emission compared to conventional diesel engine.
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Liu, Jian-Hong, Fu-Min Shang, and Nikolay Efimov. "Numerical Study on Flow and Heat and Mass Transfer in Pulsating Heat Pipe." In ASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/mnhmt2019-4012.
Повний текст джерелаАнотація:
Abstract Numerical simulation was performed to establishing a two-dimensional pulsating heat pipe model, to investigate the flow and heat transfer characteristics in the pulsating heat pipe by using the Mixture and Euler models, which were unsteady models of vapor-liquid two-phase, based on the control-volume numerical procedure utilizing the semi-implicit method. Through comparing and analyzing the volume fraction and velocity magnitude of gas phase to decide which model was more suitable for numerical simulation of the pulsating heat pipe in heat and mass transfer research. It was showed there had gas phase forming in stable circulation flow in the heating section, the adiabatic section using the Mixture and Euler models respectively, and they were all in a fluctuating state at 10s, besides, the pulsating heat pipe had been starting up at 1s and stabilizing at 5s, it was all found that small bubbles in the heat pipe coalescing into large bubbles and gradually forming into liquid plugs and gas columns from the contours of volume fraction of the gas phase; through comparing the contours of gas phase velocity, it could be seen that there had further stably oscillating flow and relatively stabler gas-liquid two-phase running speed in the pulsating heat pipe used the Mixture model, the result was consistent with the conclusion of the paper[11] extremely, from this it could conclude that the Mixture model could be better simulate the vaporization-condensation process in the pulsating heat pipe, which could provide an effective theoretical support for further understanding and studying the phase change heat and mass transfer mechanism of the pulsating heat pipe.
Звіти організацій з теми "Forming mixture"
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Ovalle, Samuel, E. Viamontes, and Tony Thomas. Optimization of DLP 3D Printed Ceramic Parts. Florida International University, October 2021. http://dx.doi.org/10.25148/mmeurs.009776.
Повний текст джерелаАнотація:
Digital Light Processing (DLP) 3D printing allows for the creation of parts with advanced engineering materials and geometries difficult to produce through conventional manufacturing techniques. Photosensitive resin monomers are activated with a UV-producing LCD screen to polymerize, layer by layer, forming the desired part. With the right mixture of photosensitive resin and advanced engineering powder material, useful engineering-grade parts can be produced. The Bison 1000 is a research-grade DLP printer that permits the user to change many parameters, in order to discover an optimal method for producing 3D parts of any material of interest. In this presentation, the process parameter optimization and their influence on the 3D printed parts through DLP technique will be discussed. The presentation is focused on developing 3D printable slurry, printing of complex ceramic lattice structures, as well as post heat treatment of these DLP-produced parts.