| 131. |
- Li, Liangxing, et al.
(författare)
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冷中子源冷包截面含汽率数理模型探讨
- 2007
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Ingår i: Gongcheng Rewuli Xuebao. - Beijing, China. - 0253-231X. ; 28, s. 64-67
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Tidskriftsartikel (refereegranskat)abstract
- 文章推导出一种计算冷包截面含汽率的数学模型;将模型计算结果与已知文献相关实验结果进行对比,验证了模型的正确性.利用该模型探讨了冷包截面含汽率的影响因素如气泡直径,工质液体的密度、粘性,加热功率等.模型计算表明:气泡直径越大,在同一截面高度处的截面含汽率越低;工质粘性越大,在同一截面高度处的截面含汽率越高.本文模型的计算结果能对冷包设计提供理论支持.
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| 132. |
- Li, Liangxing, et al.
(författare)
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熔融液滴与冷却剂相互作用实验中液滴释放控制机构的研制
- 2008
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Ingår i: Hedongli Gongcheng. - ChengDu, China. - 0258-0926. ; 29, s. 42-45
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Tidskriftsartikel (refereegranskat)abstract
- 在高温熔融液滴与冷却剂相互作用的实验中,熔融液滴的释放控制对整个实验起至关重要的作用。本文在以往实验机械控制装置的基础上,自主设计一个自动控制电路来代替人工机械操作,利用控制电路给电磁铁提供瞬时脉冲来控制液滴瞬时释放下落,简化实验的可持续性操作,提高实验的重复性、精确性和操作方便性。
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| 133. |
- Li, Liangxing, et al.
(författare)
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熔融液滴在冷却剂中的运动特性实验
- 2007
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Ingår i: Hedongli Gongcheng. - Chengdu, China. - 0258-0926. ; 28, s. 36-41
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Tidskriftsartikel (refereegranskat)abstract
- 设计、建立了研究高温熔融液滴与冷却剂相互作用的可视化实验装置,通过高速摄影记录熔融液滴的下落过程,获得了下落小球运动过程曲线,重点考察了液滴温度和冷却剂温度对液滴-冷却剂界面作用过程的影响。结果表明,熔融液滴穿过气-水界面后,将首先经历一个速度骤降-回升过程,之后液滴作减速运动下落;当冷却水温度一定时,高温熔融液滴温度越高,熔融液滴入水后下落速度越快;当熔融液滴温度一定时,冷却水温度越高,熔融液滴入水后下落速度越快。
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| 134. |
- Li, Xiao Juan, et al.
(författare)
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Research progress of frost formation on microchannel heat exchangers
- 2017
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Ingår i: Xiandai Huagong/Modern Chemical Industry. - 0253-4320. ; 37:11, s. 47-52
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Forskningsöversikt (refereegranskat)abstract
- Focusing on the frost formation in microchannel heat exchangers, this paper analyzes the effects of frost formation on the thermal performance of microchannel heat exchangers, and summarizes the influence factors that cause the microchannel heat exchangers to form frost, including environmental factors and structure factors. The latest research progress in this issue at home and abroad is reviewed.
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| 135. |
- Li, Xide, et al.
(författare)
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Three-Dimension Reconstruction of Wave-Front and Pressure Field of Space-Diffraction-Sound-Wave by Computerized Tomography
- 1998
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Ingår i: Guangxue Xuebao. - 0253-2239. ; 18:12, s. 1669-1675
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Tidskriftsartikel (refereegranskat)abstract
- The pulsed-carried ESPI (electron speckle photographic interference) and the with computerized tomography (CT) technique were used to evaluate the three-dimensional wavefront and pressure field distribution of diffraction field of acoustic wave through different aperture masks. Experiments were carried out by using an electrical discharge between two electrodes as sound source. The property of CT reconstruction under the conditions of noise projection was discussed
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| 136. |
- Li, Xiaofeng, et al.
(författare)
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双色光束增强飞秒激光氮气标记示踪测速技术的研究
- 2022
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Ingår i: Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics. - 0253-231X. ; 43:10, s. 2826-2830
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Tidskriftsartikel (refereegranskat)abstract
- In this work, the fluorescence of FLEET (femtosecond laser electron excited tagging) was enhanced by two color femtosecond laser. the intensity of FLEET was increased about 20% with two laser pulses that were 400 μJ/pulse at 266 nm and 3 mJ/pulse at 800 nm, and the results indicated that there was nearly no influence on lifetime and wavelength of fluorescence from FLEET. This result provides many information for the following studies.
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| 137. |
- Li, Yong, et al.
(författare)
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竖直矩形通道内超临界正癸烷振荡特性的大涡模拟
- 2022
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Ingår i: Nanjing Hangkong Hangtian Daxue Xuebao/Journal of Nanjing University of Aeronautics and Astronautics. - 1005-2615. ; 54:2, s. 281-289
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Tidskriftsartikel (refereegranskat)abstract
- Active generative cooling based on supercritical hydrocarbon fuel is regarded as one of the most promising methods for scramjet thermal management. A large eddy simulation method is used to explore the transient change law of the initial flow, and heat transfer behaviors of supercritical hydrocarbon fuel is in rectangular channels. An oscillation effect can be proved in the convective heat transfer process, i.e., the temperature and velocity distributions fluctuate strongly. By monitoring the velocity variation rule of 10-4 s time scale, the approximate trigonometric frequency and amplitude are present in this oscillation. At the initial heating condition, the high-temperature fluid, which is close to the heated wall, flows into the low-temperature region under the effect of buoyancy force. As the fluid temperature gradually reaches the pseudo-critical value, its thermo-physical properties change dramatically. The friction factor oscillates as well as the fluid kinetic energy. Correspondingly, the enhanced vortex is induced away from the heated wall. Over time, the enhanced vortex begins to move to the heated wall and the low-temperature fluid impinges on the wall. Consequently, the thermal transport is enhanced.
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| 138. |
- Li, Z. L., et al.
(författare)
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Effect of the electronic dimensionality of electrodes on the current-voltage characteristics of single molecular devices
- 2004
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Ingår i: Wuli xuebao. - : Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences. - 1000-3290. ; 53:5, s. 1490-1495
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Tidskriftsartikel (refereegranskat)abstract
- The electrodes can be constructed by different dimensionality of electronic systems in energy representation when the current through the molecular junction is measured. Basing on the elastic scattering Green function theory, we have developed the theoretical methods for studying the electronic transport properties of molecular junctions and paid attention to the influence of the dimensionality of electrodes. The alpha, alpha'-xylyl dithiol molecule is taken as an example and its current-voltage characteristics have been investigated for electrodes with different-dimension electronic systems. The numerical results show that dimensionality of metal contacts has strong effect on the current-voltage characteristics of molecular junction, in particular the shape of the conductance curves.
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| 139. |
- Liang, G-B, et al.
(författare)
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Modified regularization method applied to the inversion of particle size distribution from light scattering data
- 2006
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Ingår i: Guangdian Gongcheng. - 1003-501X. ; 33:12, s. 44-49
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Tidskriftsartikel (refereegranskat)abstract
- Laser particle size analyzer is one of the instruments for particle size analysis. Recent developments focus on various algorithms for particle size analysis via light energy distribution based on the Mie scattering theory in the laser analyzer. The determination of the particle size distribution (PSD) from the analyzer requires the inversion of the Fredholm integral equation of the first kind. This equation is an ill-posed one, which can be analyzed by effective algorithms. This paper presents a modified regularization method applied to the inversion of the PSD with the independent models. The Generalized Cross-Validation (GCV) method was used for the selection of a regularization parameter. The Successive Over-Relaxation (SOR) iterative method was applied to improve the exactness and stability of the convergent result. The simulation with the models was carried out. The simulated results are in a good agreement with the data measured from nine standard particulate samples as well as their mixtures. It is indicated that this method can be feasible and effective for the simulation of the PSD from the corresponding light scattering data.
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| 140. |
- Liang, Zhen-pu, et al.
(författare)
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单分子层修饰生物芯片基片的电化学研究
- 2005
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Ingår i: Journal of Wuhan University (Natural Science Edition). - 1671-8836. ; :2, s. 249-252
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Tidskriftsartikel (refereegranskat)abstract
- A biotin-avidin modified biochip has been constructed, and its electrochemistry characteristics were studied with K4Fe(CN)(6).3H2O and ferrocene as the indicators by cyclic voltammograms. Electrochemical experiments showed that this biochip has high response signal, reproducibility,uniformity and low background signal; the ferrocene can be used as high efficiency electron medium. And these results were discussed in this paper.
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