Xem 1-20 trên 89 kết quả Thermal control
  • Introduction to Control Systems, Mathematical Modeling of Control Systems, Mathematical Modeling of Mechanical Systems and Electrical Systems, Mathematical Modeling of Fluid Systems and Thermal Systems, Transient and Steady-State Response Analyses,... as the main contents of the book "Modern Control Engineering". Invite you to consult.

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  • Thermal Analysis is a well-established set of techniques for obtaining qualitative and quantitative information about the effects of various heat treatments on materials of all kinds, including new chemical compounds, plastics, ceramics, alloys, construction materials, minerals, foods and medicines. Heating is performed under strictly controlled conditions and can reveal changes in structure and other important properties of the material being studied. Such studies are of great practical importance in the use of materials....

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  • Effect of wollastonite nanofibers on the improvement of thermal conductivity coefficient of Medium-Density Fiberboard (MDF) was studied here to find a possible solution to decrease hot-press time as a bottle-neck during composite production. Nanowollastonite was applied at 10%, based on the dry weight of wood fibers. Density of the control MDF boards was 0.66 g/cm3. Thermal conductivity coefficient was measured using an apparatus based on Fourier’s Law for heat conduction.

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  • Spirax Sarco recirculating feedwater spray systems type RFS are designed to provide additional flash steam condensing capacity on boiler feedtank applications. When the condensate return flowrate is high and the cold make-up flowrate is intermittent it is likely that valuable flash steam will be lost through the vent. To ensure that this flash steam is condensed it is often worthwhile to take feedwater from a relatively cool part of the feedtank and pump it to a spray nozzle.

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  • Long-time protection: The long-time protection function protects cables (phases and neutral) against overloads. This function is based on true rms measurements. Thermal memory: The thermal memory continuously accounts for the amount of heat in the cables, both before and after tripping, whatever the value of the current (presence of an overload or not). The thermal memory optimises the long-time protection function of the circuit breaker by taking into account the temperature rise in the cables. The thermal memory assumes a cable cooling time of approximately 15 minutes....

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  • This book is concerned with the subject of Wind Energy, as a source of clean and renewable and free for all. The need for this type of book is very well documented, the current consumption of energy is unsustainable and humans have to change their habits and or utilise this source, but there is so much work before we can rely completely on renewable energy. This book aims to describe the fundamentals of wind energy and the pertinent parameters that control the amount of energy available from a given wind turbine. Coal fuelled the industrial revolution in the 18th and 19th century.

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  • Electrical machines are almost entirely used in producing electricity, and there are very few electricity-producing processes where rotating machines are not used. In such processes, at least auxiliary motors are usually needed. In distributed energy systems, new machine types play a considerable role: for instance, the era of permanent magnet machines has now commenced. About half of all electricity produced globally is used in electric motors, and the share of accurately controlled motor drives applications is increasing.

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  • San Antonio 10EJV - PreMP BUILD 0307: 1.COVER PAGE, 2.INDEX, 3.BLOCK DIAGRAM, 4.POWER SEQUENCE BLOCK, 5.11.SYSTEM POWER, 12.CLOCK GENNERATOR, 13.CPU(1/4), 14.CPU(2/4), 15.CPU(3/4), 16.CPU(4/4), 17.FAN & THERMAL CONTROLLER, 18.N/B(1/5), 19.N/B(2/5), 20.N/B(3/5).

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  • Thermal processing of foods in one form or the other has been in place since the 1900s. Although the fundamental principles remain the same, there have been numerous improvements in the control and automation of thermal processes. The various chapters in this book provide an insight into the details of the control and automation processes and details involved for different thermal processes.

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  • Bearings (both plain and rolling element) are used as important supporting elements for locating rotating components and confining their motion in desired direction. In order to ensure their operational reliability and desired life, these need to be properly designed/selected for an application more so because of ever increasing operational speeds. This requires the careful performance evaluation of different types of bearings considering aspects such as thermal stability, lubrication, contaminants in lubricants and controlling mechanism etc....

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  • Physical properties of metals, ceramics, and polymers, such as ductility, thermal expansion, heat capacity, elastic modulus, electrical conductivity, and dielectric and magnetic properties, are a direct result of the structure and bonding of the atoms and ions in the material. An understanding of the origin of the differences in these properties is of great engineering importance.

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  • This book is concerned with the subject of Wind Energy, as a source of clean and renewable and free for all. The need for this type of book is very well documented, the current consumption of energy is unsustainable and humans have to change their habits and or utilise this source, but there is so much work before we can rely completely on renewable energy. This book aims to describe the fundamentals of wind energy and the pertinent parameters that control the amount of energy available from a given wind turbine....

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  • CHAPTER 54 COOLING ELECTRONIC EQUIPMENT Allan Kraus Allan D. Kraus Associates Aurora, Ohio 54.1 THERMAL MODELING 54. 1 . 1 Introduction 54. 1 .2 Conduction Heat Transfer 54.1.3 Convective Heat Transfer 54.1.4 Radiative Heat Transfer 54.1.5 Chip Module Thermal Resistances HEAT-TRANSFER CORRELATIONS FOR ELECTRONIC EQUIPMENT COOLING 54.2.1 Natural Convection in Confined Spaces 1649 1 649 54.3 1649 1652 1655 1656 54.2.2 Forced Convection 1662 1667 1672 1672 1674 THERMAL CONTROL TECHNIQUES 54.3.1 Extended Surface and Heat Sinks 54.3.2 The Cold Plate 54.3.3 Thermoelectric Coolers 54.

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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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  • Hexabromobenzene (HBB) has been used as a flame retardant in polymers, plastics, textiles, wood and paper. Its primary uses have been reported in the plastics, paper and electrical industries (Bruchajzer et al., 2004). U.S. production/import volume was listed as 10,000- 500,000 pounds for 1998, but no information is available beyond that time (U.S. EPA, 2002). In addition to its use as a flame retardant, HBB is a thermal decomposition product of octa- and decaBDEs and hexabromobiphenyl (as cited in Bruchajzer et al., 2004).

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  • Diffusion is the transport of matter from one point to another by thermal motion of atoms or molecules. It is relatively fast in gases, slow in liquids, and very slow in solids. Diffusion plays a key rˆole in many processes as diverse as intermixing of gases and liquids, permeation of atoms or molecules through membranes, evaporation of liquids, drying of timber, doping silicon wafers to make semiconductor devices, and transport of thermal neutrons in nuclear power reactors.

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  • The increasing percentage of digital designers and digital layout experts in the engineering population reflects the directions that our industry is headed. Although the emphasis on digital design is providing significant advances in electronics end products, there is still and will always be a portion of circuit design that interfaces with the analog or real world. There is some similarity in layout strategies between these two domains, but the differences can make an easy circuit layout design less than optimum when trying to achieve good results.

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  • Addition of Surrogates and Matrix Spiking Compounds in the Field: It is best to add analytical surrogate and matrix spiking compounds into soils prior to sample extraction, using water or a solvent. Method 5035A does not incorporate the addition of these compounds prior to extraction in the field. Because this is an important control check on the analytical process, it may be appropriate to incorporate a procedure which adds surrogate and/or matrix spiking compounds prior to extraction for some project/program DQOs.

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  • Save the Children’s “Saving Newborn Lives” (SNL) program is testing and evaluating a critical set of community-based neonatal healthcare tools and technologies. in Sylhet, Bangladesh, community health workers demonstrated effective management of serious neonatal illnesses using interventions such as clean cord care, thermal control, and sepsis management in the home, which led to a 34 percent reduction in neonatal mortality.

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  • The thermal denaturation of endo-b-1,3-glucanase from the hyperthermo-philic microorganismPyrococcus furiosuswas studied by calorimetry. The calorimetric profile revealed two transitions at 109 and 144C, correspond-ing to protein denaturation and complete unfolding, respectively, as shown by circular dichroism and fluorescence spectroscopy data.

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