共查询到19条相似文献,搜索用时 328 毫秒
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HUGHES M-65L LAATM-65L激光增强的机载TOW(LAAT)系统是装在AH-1SCobra攻击直升机上的M-65光学瞄准系统的改进型。它是在M-65TOW导弹系统瞄准具基础上增加了一台激光测距仪,为直升机火控计算机提供距离信息,以控制... 相似文献
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TBP对部分皂化的DMHPA—正庚烷体系及萃取稀土有机相的影响 总被引:1,自引:0,他引:1
沈玉华 《光谱学与光谱分析》1998,18(3):311-314
研究了部分皂化的二(1甲基庚基)磷酸(DMHPA)磷酸三丁酯(TBP)—正庚烷(C7H16)体系及萃取稀土有机相的聚集状态。结果表明,TBP可以扩大DMHPAC7H16H2O微乳状液形成的区间,并且对萃取有机相的存在状态及水的行为有明显的影响,在一定的条件下有凝胶形成。FTIR光谱分析表明,该类凝胶中DMHPA和TBP与稀土离子以多种形式配位,TBP与DMHPA及水的氢键结合对凝胶网状结构的形成也起了一定的作用。 相似文献
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2DNMR在波谱学的化学应用中占据首要位置。本文简述了COSY,LRCOSY,COSYDEC,SECSY,DQC-COSY,RCT,INADIQUATE,RELAY,INVERSE,NOESY,HOESY,OHAHA,ROESY,HMQC,HMBC等谱的形状,指认步骤及其应用。 相似文献
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Zhang Qingfu Gou Qingquan Zhu Zhenghe Luo Jiaoming Liu Fusheng Sun Jiuxun Miao Bingyou Ye Anpei Cheng Xianmeng 《原子与分子物理学报》1995,(2)
THE EXCESS HEAT EXPERIMENTS ON COLD FUSION IN TITANIUM LATTICETHEEXCESSHEATEXPERIMENTSONCOLDFUSIONINTITANIUMLATTICE¥ZhangQing... 相似文献
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Jiang Yuhai Sun Jinfeng Wan Lingde Department of Physics Henan Normal University Xinxiang China 《原子与分子物理学报》1997,(4)
ARESEARCHFORPOSITRONCORREL-ATIONPOLARIZATIONPOTENTIALJiangYuhaiSunJinfengWanLingdeDepartmentofPhysics,HenanNormalUniversity,... 相似文献
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Ma Xinwen Wang Youde Hou Mingdong Jin Gengmin Institute of Modern Physics Academia Sinica Lanzhou September 《原子与分子物理学报》1996,(3)
HIGHLYCHARGEDATOMICPHYSICSATHIRFL-CSRMaXinwenWangYoudeHouMingdongJinGengminInstituteofModernPhysics,AcademiaSinica,Lanzhou73... 相似文献
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An irreversible combined Carnot cycle model using ideal quantum gases as a working medium was studied by using finite-time thermodynamics. The combined cycle consisted of two Carnot sub-cycles in a cascade mode. Considering thermal resistance, internal irreversibility, and heat leakage losses, the power output and thermal efficiency of the irreversible combined Carnot cycle were derived by utilizing the quantum gas state equation. The temperature effect of the working medium on power output and thermal efficiency is analyzed by numerical method, the optimal relationship between power output and thermal efficiency is solved by the Euler-Lagrange equation, and the effects of different working mediums on the optimal power and thermal efficiency performance are also focused. The results show that there is a set of working medium temperatures that makes the power output of the combined cycle be maximum. When there is no heat leakage loss in the combined cycle, all the characteristic curves of optimal power versus thermal efficiency are parabolic-like ones, and the internal irreversibility makes both power output and efficiency decrease. When there is heat leakage loss in the combined cycle, all the characteristic curves of optimal power versus thermal efficiency are loop-shaped ones, and the heat leakage loss only affects the thermal efficiency of the combined Carnot cycle. Comparing the power output of combined heat engines with four types of working mediums, the two-stage combined Carnot cycle using ideal Fermi-Bose gas as working medium obtains the highest power output. 相似文献
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工质变比热条件下内燃机循环普适特性 总被引:4,自引:0,他引:4
用有限时间热力学的方法分析空气标准不可逆内燃机循环,导出了考虑工质变比热情况下,存在摩擦及传热损失时,由两个加热过程、两个放热过程和两个绝热过程组成的普适的空气标准不可逆内燃机循环的功率与压缩比、效率与压缩比以及功率和效率的最佳特性关系,同时由数值计算分析了工质变比热和循环过程对循环性能的影响特点,比较了工质恒、变比热时循环性能差异。所得结果包含了不可逆往复式Diesel、Otto、Brayton、Atkinson、Dual和Miller 循环的性能特性。 相似文献
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Optimal configuration of a class of endoreversible heat engines with fixed duration, input energy and radiative heat transfer
law (q ∝ Δ(T
4)) is determined. The optimal cycle that maximizes the efficiency of the heat engine is obtained by using optimal-control
theory, and the differential equations are solved by the Taylor series expansion. It is shown that the optimal cycle has eight
branches including two isothermal branches, four maximum-efficiency branches, and two adiabatic branches. The interval of
each branch is obtained, as well as the solutions of the temperatures of the heat reservoirs and the working fluid. A numerical
example is given. The obtained results are compared with those obtained with the Newton’s heat transfer law for the maximum
efficiency objective, those with linear phenomenological heat transfer law for the maximum efficiency objective, and those
with radiative heat transfer law for the maximum power output objective. 相似文献
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William R. Johnson Simon J. Hook Pantazis Mouroulis Daniel W. Wilson Sarath D. Gunapala Cory J. Hill Jason M. Mumolo Bjorn T. Eng 《Infrared Physics & Technology》2009,52(6):430-433
A thermal hyperspectral imager is underdevelopment which utilizes the compact Dyson optical configuration and the broadband (8–12 μm) quantum well infrared photodetector (QWIP) focal plane array technology. The Dyson configuration uses a single monolithic prism-like grating design which allows for a high throughput instrument (F/1.6) with minimal ghosting, stray light and large swath width. The configuration has the potential to be the optimal high resolution imaging spectroscopy solution for aerial and space remote sensing applications due to its small form factor and relatively low power requirements. The planned instrument specifications are discussed as well as thermal design trade-offs. The current design uses a single high power cryocooler which allows operation of the QWIP at 40 K with adequate temperature stability.Calibration testing results (noise equivalent temperature difference, spectral linearity and spectral bandwidth) and laboratory emissivity plots from samples are shown using an operational testbed unit which has similar specifications as the final airborne system. Field testing of the testbed unit was performed to acquire plots of emissivity for various known standard minerals (quartz, opal, alunite). A comparison is made using data from the ASTER spectral library. The current single band (8–9 μm) testbed utilizes the high uniformity and operability of the QWIP array and shows excellent laboratory and field spectroscopic results. 相似文献
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An Otto cycle engine with internal and external irreversibilities of friction and heat leakage, in which the heat transfer between the working fluid and the environment obeys linear phenomenological heat transfer law [q ∝△(T -1)], is studied in this paper. The optimal piston motion trajectory for maximizing the work output per cycle is derived for the fixed total cycle time and fuel consumed per cycle. Optimal control theory is applied to determine the optimal piston trajectories for the cases of with and w... 相似文献
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M. Birau M. A. Krasil’nikov M. V. Kuzelev A. A. Rukhadze 《Journal of Experimental and Theoretical Physics》1997,84(4):694-702
The nonstationary problem of excitation of a plasma microwave oscillator of a finite length driven by a pulsed relativistic
beam is analyzed. Both analytic and numerical techniques have been used in studying the oscillator dynamics at given beam
parameters (configuration, electron energy, and current pulse), with different plasma configurations, and at various lengths
of the system. Oscillator characteristics such as the output power, efficiency, and output spectrum have been determined at
parameters close to real experimental values. Conditions of optimal oscillator operation have been determined.
Zh. éksp. Teor. Fiz. 111, 1258–1273 (April 1997) 相似文献