Xem 1-20 trên 21 kết quả Thermal dynamics
  • This book includes contributions from researchers around the world on numerical developments and applications to predict fluid flow and heat transfer, with an emphasis on thermal hydraulics computational fluid dynamics. Our ability to simulate larger problems with greater fidelity has vastly expanded over the past decade. The collection of material presented in this book augments the ever-increasing body of knowledge concerning the important topic of thermal hydraulics.

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  • I. Introduction An important aspect of nuclear reactor core analysis involves the determination of the optimal coolant flow distribution and pressure drop across the reactor core. On the one hand, higher coolant flow rates will lead to better heat transfer coefficients and higher Critical Heat Flux (CHF) limits. On the other hand, higher flows rates will also in large pressure drops across the reactor core, hence larger required pumping powers and larger dynamic loads on the core components.

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  • At the beginning of the 19th century the description of matter attained, what one would call today, a scientific basis. Dalton1 supported the atomic theory with experiments permitting the development of modern chemistry. The book “A New System of Chemical Philosophy,” describes this new approach. In Fig. 1.1, an excerpt is displayed. Chapters I and II give a summary of the contemporary understanding of nature by analyzing heat and mass, the two basic building-blocks of any material. Chapter I displays the theory of the caloric as it was generally...

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  • Spring Designer’s Handbook, Harold Carlson Computer-Aided Graphics and Design, Daniel L. Ryan Lubrication Fundamentals, J. George Wills Solar Engineering for Domestic Buildings, William A. Himmelman Applied Engineering Mechanics: Statics and Dynamics, G. Boothroyd and C. Poli Centrifugal Pump Clinic, Igor J. Karassik Computer-Aided Kinetics for Machine Design, Daniel L. Ryan Plastics Products Design Handbook, Part A: Materials and Components; Part B: Processes and Design for Processes, edited by Edward Miller Turbomachinery: Basic Theory and Applications, Earl Logan, Jr.

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  • Phép đo sức bền cơ nhiệt TMCT (Thermal Mechanical Compression Test) được ứng dụng để đo nhiệt độ hóa mềm Tg-r (glass-rubber transition temperature) của bột gạo ở khoảng ẩm độ thấp từ 2.4-19.5 % cơ sở ướt. Kết quả cho thấy Tg-r tăng khi ẩm độ giảm.

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  • The evolution of technological advances in infrared sensor technology, image processing, “smart” algorithms, knowledge-based databases, and their overall system integration has resulted in new methods of research and use in medical infrared imaging. The development of infrared cameras with focal plane arrays not requiring cooling added a new dimension to this modality. New detector materials with improved thermal sensitivity are now available and production of high-density focal plane arrays (640×480) has been achieved.

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  • Subduction is a major process that plays a first-order role in the dynamics of the Earth. The sinking of cold lithosphere into the mantle is thought by many authors to be the most important source of energy for plates driving forces. It also deeply modifies the thermal and chemical structure of the mantle, producing arc volcanism and is responsible for the release of most of the seismic energy on Earth. There has been considerable achievements done during the past decades regarding the complex interactions between the various processes acting in subduction zones.

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Influence of Nanogels on Mechanical, Dynamic Mechanical, and Thermal Properties of Elastomers

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  • Prof. Dr. David Jou Universitat Autònoma de Barcelona Dept. Fisica - Edifici Cc Grup Fisica Estadistica Bellaterra 08193 Catalonia, Spain David.Jou@uab.es Prof. Dr. Georgy Lebon Université de Liège Dept. d’Astrophysique G´ ophysique et Oc´ anographie e e B5 Sart Tilman Liege 4000 Belgium g.lebon@ulg.ac.be Prof. Dr. José Casas-Vázquez Universitat Autònoma de Barcelona Dept. Fisica - Edifici Cc Grup Fisica Estadistica Bellaterra 08193 Catalonia, Spain Jose.Casas@uab.es Cover image: Thermal radiation leaving the Earth, seen by the EOS-Terra satellite (NASA). Image from www.

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  • There have been major breakthroughs in lung surfactant (LS) research over the last two decades that have changed our concept of how and why the material works well at the lung air–water interface. From the initial ideas of a surface active material lining the alveoli to the seminal concepts of how low surface tension is reached, the classical ideas about Comroe’s “extraordinary juice” requires revision and re-thinking.

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  • Actin is one of the most abundant proteins in nature. It is found in all eukaryotes and plays a fundamental role in many diverse and dynamic cellular processes. Also, actin is one of the most ubiquitous proteins because actin-like proteins have recently been identified in bacteria.

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  • Heteronuclear NMR relaxation measurements and hydro-gen exchange data have been used to characterize protein dynamics in the presence or absence of stabilizing solutes from hyperthermophiles. Rubredoxin from Desulfovibrio gigaswas selected as a model protein and the effect of diglycerol phosphate on its dynamic behaviour was studied. The presence of 100 mMdiglycerol phosphate induces a fourfold increase in the half-life for thermal denaturation ofD.

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  • Recent years have witnessed high levels of activity in identifying enzyme systems that catalyse H-transfer by quantum tunneling. Rather than being restricted to a small number of specific enzymes as perceived initially, it has now become an accepted mechanism for H-transfer in a growing number of enzymes. Furthermore, H-tunneling is driven by the thermally induced dynamics of the enzyme. In some of those enzymes that break stable C–H bonds the reaction proceeds purely by quantum tunneling, without the need to partially ascend the barrier.

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  • 4 Machine Tool Dynamics and Vibrations 4.1 4.2 4.3 Introduction Mechanical Structure • Drives • Controls Chatter Vibrations in Cutting Stability of Regenerative Chatter Vibrations in Orthogonal Cutting Yusuf Altintas The University of British Columbia Analytical Prediction of Chatter Vibrations in Milling Dynamic Milling Model • Chatter Stability Lobes 4.1 Introduction The accuracy of a machined part depends on the precision motion delivered by a machine tool under static, dynamic, and thermal loads.

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  • The accuracy of a machined part depends on the precision motion delivered by a machine tool under static, dynamic, and thermal loads. The accuracy is evaluated by measuring the discrepancy between the desired part dimensions identified on a part drawing and the actual part achieved after machining operations.

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  • Zhao et al. Nanoscale Research Letters 2011, 6:368 http://www.nanoscalereslett.com/content/6/1/368 NANO EXPRESS Open Access A compact model for magnetic tunnel junction (MTJ) switched by thermally assisted Spin transfer torque (TAS + STT) Weisheng Zhao1,2*, Julien Duval1,2, Jacques-Olivier Klein1,2 and Claude Chappert1,2 Abstract Thermally assisted spin transfer torque [TAS + STT] is a new switching approach for magnetic tunnel junction [MTJ] nanopillars that represents the best trade-off between data reliability, power efficiency and density.

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  • Chiavazzo and Asinari Nanoscale Research Letters 2011, 6:249 http://www.nanoscalereslett.com/content/6/1/249 NANO EXPRESS Open Access Enhancing surface heat transfer by carbon nanofins: towards an alternative to nanofluids? Eliodoro Chiavazzo and Pietro Asinari* Abstract Background: Nanofluids are suspensions of nanoparticles and fibers which have recently attracted much attention because of their superior thermal properties. Nevertheless, it was proven that, due to modest dispersion of nanoparticles, such high expectations often remain unmet.

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  • Things only move when they are forced to move! A bicycle only moves when a force is applied in the form of pedaling. A cloud on the sky only moves when a force is applied in the form of a storm or a wind. A soccer ball only flies into the goal net when a force in the form of a beautiful and precise shot from Peter Møller or another great soccer player is applied. Thus all sorts of transport only take place when a force, called a driving force, is applied. This is also the case when we are talking about transport of other...

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  • The standard is intended for the development of organic production and trade in the East African region. The standards can be a platform for a common label for organic products in East Africa and for developing consumer trust. The standard also formulates standpoints which can be used in international negotiations on standards. Further, it can be a basis for equivalence agreements with other countries and regions. The East African organic products standard has been written in a way to make it easy for the reader and user to access and understand.

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  • Dynamic Temperature Measurement General Information The term dynamic temperature measurement covers all measurements during which thermal transients occur in a sensor irrespective of whether the transient is caused by temperature variations in the medium, whose temperature is to be measured, or in the temperature sensor, itself. Thus, unavoidable dynamic errors occur during the measurement of any temperatures, changing with time. Errors also arise during the temperature measurement of a medium at a constant temperature using a temperature sensor immersed in the medium.

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