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Thermal and Mechanical Design
Published in Shen-En Qian, Hyperspectral Satellites and System Design, 2020
Blanket design must accommodate requirements for durability, flammability, contamination control, launch loads, pressure decay, spacecraft venting, glint minimization, and restrictions on magnetic materials. Because most launch sites are near beaches (or even in the middle of the ocean, as in the case of Sea-Launch), exposure to salt spray and other corrosive agents is possible, so blanket design must take that exposure into account. All of these functions and design requirements must be addressed by blanket developers, who are also striving to minimize mass, cost, risk, and development time, while maintaining relatively durable blanks to survive assembly operations, testing and vibration associated with transportation and launch.
Bed linen
Published in V. Ramesh Babu, S. Sundaresan, Home Furnishing, 2018
Blankets, bed sheets and pillowcases are a classic combination for versatility, style and comfort. Made with a variety of fabrics including cotton, cotton/blend, synthetics and wool, blankets compliment anything from fine quality silk sheets to standard discount bed sheets. Types of blankets include cotton, fleece, down, wool and electric. Each of these blankets has its own special characteristics regarding construction and comfort levels.
Fast Reactors
Published in C. K. Gupta, Materials in Nuclear Energy Applications, 1989
A blanket material is utilized to surround the core in both the fast fission breeder and thermonuclear fusion reactors to capture (or absorb) escaping neutron and breed new nuclear fuels. The functions of the blanket material consist of two major steps: (1) capture of escaping neutrons, and (2) production of more fissile materials of a given kind than are consumed. In other words, the purpose of the blanket material in an FBR is to breed more nuclear fuel than is consumed. The nuclear requirements for blanket materials in a fast reactor are quite different from those for moderators and reflectors in a thermal reactor (the nuclear requirements for moderators and reflectors are the same in a thermal reactor). The nuclear properties required for the blankets in FBRs are that they should be nuclear fertile fuel, possess a large neutron absorption cross section, have a low neutron-scattering cross section, and show ease of fuel reprocessing. In addition to the nuclear requirements, blankets must have some attributes of the structural materials in that they must have (1) adequate mechanical strength, (2) thermal stability, (3) irradiation stability, (4) fabricability, and (5) corrosion resistance. Reasonably good heat-transfer characteristics are also required for blankets to dissipate the thermal energy during neutron capture and subsequent emission of radiation in fast reactors.
A fusion denoising method based on homomorphic transform and 3D transform-domain collaborative filtering for laser speckle imaging of blood flow
Published in Journal of Modern Optics, 2022
Xuenian Fu, Sijin Wu, Juanning Si, Weixian Li
Seven male Sprague-Dawley rats ( g) were randomly selected for the cerebral blood flow imaging experiment. The experimental procedure was conducted in accordance with guidelines provided by the Institutional Laboratory Animal Management and Use Committee of Beijing Vital River Laboratory Animal Technology Co., Ltd. The rats were anaesthetized by intraperitoneal injection of ketamine. A observation window was polished on the right side of the rats' skulls. The skulls were only thinned but not worn through. During the data collection process, the rats' body temperatures were maintained at 37 C using a feedback electric blanket (SS20-2, Anhui Zhenghua Biologic Apparatus Facilities., Anhui, China). The rats' rectal temperatures were monitored continuously. The exposure time of the camera was 5 ms and the frame rate was 30 Hz.
Quantum chemical simulation and laboratory testing of the curing mechanism and performance of resin bio-oil
Published in International Journal of Pavement Engineering, 2021
Yiming Zhu, Junyan Yi, Meng Xu, Zhuo Chen, Shih-Hsien Yang, Decheng Feng
The curing time of the second step reaction was also affected by the curing temperature, so the reaction temperature of the second step needed to be determined according to the actual curing time. To investigate the effect of different temperatures on the curing time, we did a viscosity test at various temperatures. We considered the system to be fully cured when the viscosity exceeded 10,000 mPa·s. Figure 14 shows that when the reaction temperature was 100°C, the curing reaction could be completed in only 7 min. Therefore, this temperature could be used in some small areas requiring emergency repair. In practical construction, components A and B of the RBO could first be mixed at a normal temperature, and then the aggregates and filler could be mixed. After paving the material on the road surface, it should be heated with an electric blanket to strengthen in a short time. The curing time was 40 min when the reaction temperature was 60°C. In this case, it would be possible to mix the mixture at that temperature, transport it to the construction site, and pave with it. Because the curing time at 80°C was 20 min, which is too short for construction, the curing time in practical construction should be 40 min.
The formation mechanism of irregular salt caverns during solution mining for natural gas storage
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2020
Tianfu Xue, Chunhe Yang, Xilin Shi, Ma Hongling, Yinping Li, Xinbo Ge, Xin Liu
The oil blanket convection method is used to construct gas storage salt caverns. Three concentric pipe columns are installed in the wellbore: the production casing, the outer tubing and the inner tubing in order from the outside to the inside. Two types of circulation modes are formed by changing the positions of the water inlet and the brine discharging outlet, that is, a direct circulation mode and a reverse circulation mode. In the direct circulation mode fresh water or unsaturated brine is injected into the salt cavern through the inner tubing, and the saturated brine after dissolving solid salt rock is discharged from the annular space between the inner tubing and the outer tubing to the surface. The direct circulation mode forms the Pear Shape as shown in Figure 5a. In the reverse circulation mode, fresh water or unsaturated brine is injected into the salt cavern through the annular space between inner tubing and the outer tubing, and the saturated brine is discharged from the inner tubing to the surface. The reverse circulation mode forms the Morning Glory Shape whose upper portion is wider than the lower portion, as shown in Figure 5b (Warren 2016). In the construction of salt caverns, in order to supply high concentration brine to nearby salt chemical enterprises, the bottom and top of salt caverns are constructed in a direct circulation manner in China, while the middle part is constructed in a reverse circulation manner. Therefore, the construction of the salt cavern is composed of several or more direct and reverse circulation stages, and the final shape of the salt cavern is a combination of several or more pear shapes and morning glory shapes.