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Now showing items 1 - 16 of 64

  • TANK BODY OF LIGHT CRUDE OIL TANK CAR

    A tank body of a light crude oil tank car, comprising a cylinder body (1), seal heads (2) provided at both ends of the cylinder body (1), multiple valves (3) provided at the upper part of the cylinder body (1), and traction bolsters (4) and a letdown valve (5) provided at the lower part of the cylinder body (1). The cylinder body (1) comprises three layers, i.e., an inner cylinder body (6), an outer cylinder body (7), and ceramic fiber (8) disposed between the inner cylinder body (6) and the outer cylinder body (7); and a protective head (9) is mounted at the outer side of the seal head (2). The structure avoids the explosion problem due to rapid rise of the temperature of a medium in a tank body that may be easily caused when the tank car is in a fire, and the problem that a seal head may easily be pierced by a lower coupler when compartments are derailed.
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  • A double porosity material for low frequency sound absorption

    Zhao, Honggang   Wang, Yang   Yu, Dianlong   Yang, Haibin   Zhong, Jie   Wu, Fei   Wen, Jihong  

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  • Experimental Study on Reynolds Number Evolution of Gas-Filled Coal

    Liu, Chao   Li, Minghui   Zhao, Honggang  

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  • Spring Flood Forecasting Based on the WRF-TSRM Mode

    Meng, Xianyong   Sun, Zhiqun   Zhao, Honggang   Ji, Xiaonan   Wang, Hao   Xue, Lianqing   Wu, Hongjing   Zhu, Yongnan  

    The snowmelt process is becoming more complex in the context of global warming, and the current existing studies are not effective in using the short-term prediction model to drive the distributed hydrological model to predict snowmelt floods. In this study, we selected the Juntanghu Watershed in Hutubi County of China on the north slope of the Tianshan Mountains as the study area with which to verify the snowmelt flood prediction accuracy of the coupling model. The weather research and forecasting (WRF) model was used to drive a double-layer distributed snowmelt runoff model called the Tianshan Snowmelt Runoff Model (TSRM), which is based on multi-year field snowmelt observations. Moreover, the data from NASA's moderate resolution imaging spectroradiometer (MODIS) was employed to validate the snow water equivalent during the snow-melting period. Results show that, based on the analysis of the flow lines in 2009 and 2010, the WRF-driven TSRM has an overall 80% of qualification ratios (QRs), with determination coefficients of 0.85 and 0.82 for the two years, respectively, which demonstrates the high accuracy of the model. However, due to the influence of the ablation of frozen soils, the forecasted flood peak is overestimated. This problem can be solved by an improvement to the modeled frozen soil layers. The conclusion reached in this study suggests that the WRF-driven TSRM can be used to forecast short-term snowmelt floods on the north slope of the Tianshan Mountains, which can effectively improve the local capacity for the forecasting and early warning of snowmelt floods.
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  • A tunable sound-absorbing metamaterial based on coiled-up space

    Wang, Yang   Zhao, Honggang   Yang, Haibin   Zhong, Jie   Zhao, Dan   Lu, Zhongliang   Wen, Jihong  

    This paper presents a theoretical, numerical, and experimental investigation of a deep-subwavelength absorber based on the concept of coiled-up space. By adjusting a partition panel in the cavity to form an unequal-section channel, it is found that the resonance frequency of the absorber is easily tuned and near-total absorption is acquired under a fixed deep-subwavelength thickness. The absorption mechanism induced by nearly critical coupling is revealed by graphically analyzing the reflection coefficient in the complex plane. In contrast to conventional techniques, near-total absorption can be adjusted over a wider frequency range. To further enhance the absorption, we demonstrate a broad-band absorber with a relative bandwidth up to 33.3%. Published by AIP Publishing.
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  • LIQUEFIED NATURAL GAS RAILWAY TANK CAR

    A liquefied natural gas railway tank car, comprising an operating room (8) and a chassis (2); one end of the chassis (2) is a first-position end, and the other end of the chassis (2) is a second-position end or a tail end; the operating room (8) is arranged on the chassis (2) and close to the second-position end; the liquefied natural gas railway tank car further comprises a tank body (4) capable of bearing the impact load and the fatigue load during the railway transportation process and a filling and discharging system (7) capable of loading and unloading liquefied natural gas at two sides of the railway tank car; the tank body (4) is fixedly arranged on the chassis (2); the filling and discharging system (7) is arranged inside the operating room (8). The liquefied natural gas railway tank car can realize a large-scale, long-distance, safe and reliable transportation of the liquefied natural gas medium by means of railway, and solve the problem of the railway transportation of the liquefied natural gas energy sources.
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  • A space-coiled acoustic metamaterial with tunable low-frequency sound absorption

    Wang, Yang   Zhao, Honggang   Yang, Haibin   Zhong, Jie   Wen, Jihong  

    A novel low-frequency absorber composed a perforated panel and a cavity with a coiled-up channel is presented and demonstrated. Both theoretical analysis and finite element method are utilized to reveal that the absorber possesses a low-frequency absorption with deepsubwavelength thickness. The effect of the folding number of a space-coiled channel on the absorption peak position is discussed and the result shows that a greater folding number can reduce the absorption peak frequency dramatically without sacrificing the total thickness of the absorber. In order to broaden the absorption bandwidth, an absorber combining two units with different folding number is constructed to further enhance the low-frequency absorption performance. Copyright (C) EPLA, 2018.
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  • EasyParallel: A GUI platform for parallelization of STRUCTURE and NEWHYBRIDS analyses

    Zhao, Honggang   Beck, Benjamin   Fuller, Adam   Peatman, Eric   Fritsche-Neto, Roberto  

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  • Low-frequency acoustic absorption of localized resonances: Experiment and theory

    Zhao, Honggang   Wen, Jihong   Yu, Dianlong   Wen, Xisen  

    The idea of localized resonance in phononic crystals is introduced to improve the low-frequency acoustic absorption of viscoelastic materials, which are widely used underwater to absorb the unwanted noise and meet a difficult challenge to enhance low-frequency absorption. Experimental measurements for acoustic absorptances of various viscoelastic polymer slabs embedded with locally resonant scatterers, i.e., heavy spheres coated by soft silicon rubber, are reported. Theoretical investigations using a layer-multiple-scattering method show good agreement with the experiment results, which supports unambiguously the observed low-frequency absorption phenomenon. The physical mechanism for the low-frequency absorption is also investigated by referring the elements of the Mie scattering matrix. The observations suggest that the scattered energy tends to remain in transverse waves, which enhance the multiple scattering, damp rapidly in viscoelastic polymer and dominate the acoustic absorption.
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  • Alcohol-Induced Exacerbation of Ischemic Brain Injury: Role of NAD(P)H Oxidase

    Zhao, Honggang   Mayhan, William G.   Arrick, Denise M.   Xiong, Wanfen   Sun, Hong  

    Background: Chronic alcohol consumption increases ischemic stroke and exacerbates ischemic brain injury. We determined the role of NAD(P)H oxidase in exacerbated ischemic brain injury during chronic alcohol consumption. Methods: Sprague Dawley rats were fed a liquid diet with or without alcohol (6.4% v/v) for 8 weeks. We measured the effect of apocynin on 2-hour middle cerebral artery occlusion (MCAO)/24-hour reperfusion-induced brain injury. In addition, superoxide production and expression of NAD(P)H oxidase subunit, gp91phox, in the peri-infarct area were assessed. Results: Chronic alcohol consumption produced a larger infarct volume, worse neurological score, and higher superoxide production. Acute (5 mg/kg, ip, 30 minutes before MCAO) and chronic treatment with apocynin (7.5 mg/kg/d in the diet, 4 weeks prior to MCAO) reduced infarct volume, improved neurological outcome, and attenuated superoxide production in alcohol-fed rats. Expression of gp91phox at basal conditions and following ischemia/reperfusion was greater in alcohol-fed rats compared to non-alcohol-fed rats. In addition, neurons are partially responsible for upregulated gp91phox during alcohol consumption. Conclusions: Our findings suggest that NAD(P)H oxidase may play an important role in exacerbated ischemic brain injury during chronic alcohol consumption.
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  • The modification of natural pyrite and its electrochemical properties in Li/FeS2 batteries

    Zhao, Honggang   Wang, Shengping   Fan, Liren   Wu, Jinping  

    The crystal structure and electrochemical properties of modified pyrite are introduced in this study. The structural properties, morphology and thermal stability of synthesized materials were characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM), respectively. Impurities in the modified pyrite were measured using an energy dispersive spectrometer (EDS) and an inductively coupled plasma mass spectrometer (ICP-MS). In addition, the electrochemical performance of the modified pyrite in Li/FeS2 primary batteries was evaluated by cyclic voltammetry, electrochemical impedance spectroscopy and a galvanostatic discharge test. The results show that the capacity density of modified FeS2 (717.45 mAh g(-1)) is 1.77 times greater compared with natural FeS2 (570.4 mAh g(-1)). Therefore, modified natural pyrite has potentially useful significance.
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  • Seasonal Characteristics and Particle-size Distributions of Particulate Air Pollutants in Urumqi

    Meng, Xianyong   Wu, Yiping   Pan, Zhihua   Wang, Hao   Yin, Gang   Zhao, Honggang  

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  • A modified suture technique produces consistent cerebral infarction in rats

    Zhao, Honggang   Mayhan, William G.   Sun, Hong  

    Intraluminal occlusion of the middle cerebral artery (MCA) is used extensively in cerebral ischemia research. We tested a modified nylon suture in a rat model of middle cerebral artery occlusion (MCAO) under two anesthesia regimens. Sprague-Dawley rats were divided into six groups (Group 1, Poly-L-lysine-coated suture under ketamine/xylazine anesthesia; Group 2, modified suture under ketamine/xylazine anesthesia; Group 3, Poly-L-lysine-coated suture under ketamine/xylazine anesthesia with mechanical ventilation; Group 4, modified suture under ketamine/xylazine anesthesia with mechanical ventilation; Group 5, Poly-L-lysine-coated suture under isoflurane anesthesia; Group 6, modified suture under isoflurane anesthesia) and subjected to 2-hour MCAO. Regional cerebral blood flow (rCBF) was monitored by Laser-Doppler flowmetry. Neurological evaluation and ischemic lesion (TTC stain) were assessed at 24 hours of reperfusion. The total ischemic lesion (sum of areas with lacking and intermediate TTC staining) was similar among all six groups. Compared with a Poly-L-lysine-coated suture technique, the modified suture technique produced a lower rCBF, larger infarct size, smaller variance of infarct size, and greater neurological deficit. In addition, isoflurane significantly reduced infarct size. We conclude that the use of this modified suture technique with ketamine/xylazine anesthesia and mechanical ventilation produces a more consistent change in cerebral ischemic damage following MCAO in rats. (C) 2008 Elsevier B.V. All rights reserved.
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  • Tri-component phononic crystals for underwater anechoic coatings

    Zhao, Honggang   Liu, Yaozong   Wen, Jihong   Yu, Dianlong   Wen, Xisen  

    Localized resonance in phononic crystal, composed of three-dimensional arrays of composite units, has been discovered recently. The composite unit is a high-density sphere coated by soft silicon rubber. In this Letter, the absorptive properties induced by the localized resonance are systemically investigated. The mode conversions during the Mie scattering of a single coated lead sphere in unbounded epoxy are analyzed by referring the elements of the scattering matrix. Then the anechoic properties of a slab containing a plane of such composite scatterers are investigated with the multiple- scattering method by accounting the effects of the multiple scattering and the viscous dissipation. The results show that the longitudinal to transverse mode conversion nearby the locally resonant region is an effective way to enhance the anechoic performance of the finite slab of phononic crystal. Then, the influences of the viscoelasticity of the silicon rubber and the coating thickness on the acoustic properties of the finite slab are investigated for anechoic optimization. Finally, we synthetically consider the destructive scattering in the finite slab of phononic crystal and the backing, and design an anechoic slab composed of bi-layer coated spheres. The results show that the most of the incident energy is absorbed at the desired frequency band. (c) 2007 Elsevier B.V. All rights reserved.
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  • Absorptive properties of three-dimensional phononic crystal

    Zhao, Honggang   Liu, Yaozong   Yu, Dianlong   Wang, Gang   Wen, Jihong   Wen, Xisen  

    We consider the absorptive properties of three-dimensional phononic crystal (PC) composed of steel spheres arranged in viscoelastic rubber. The mode conversions during the Mie scattering of a single steel sphere in unbounded rubber are analyzed in detail. Then the multiple scattering (MS) and absorption effects induced by the simple cubic lattice and the viscosity of the rubber are investigated by the MS method. The results show that the shear and viscoelastic properties of the rubber are crucial, and the destructive interface induced by MS below each Bloch frequency enhances the absorption. Finally, the acoustic properties of finite PC slabs variation with the filling fraction and the incident angle are discussed for a variety of cases. The results show that the PC can be used as underwater anechoic material. (c) 2007 Published by Elsevier Ltd.
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  • Liquid phase behavior of perfluoroalkylalkane surfactants RID B-5285-2008

    Morgado, Pedro   Zhao, Honggang   Blas, Felipe J.   McCabe, Clare   Rebelo, Luis Paulo N.   Filipe, Eduardo J. M.  

    We have performed a combined experimental and theoretical study of the thermodynamic properties of semifluorinated alkanes. In particular, the liquid density of perfluorohexylhexane (F6H6) and perfluorohexyloctane (F6H8) has been measured as a function of temperature from 273.15 to 353.15 K and at four temperatures as a function of pressure up to 600 bar. The results were interpreted using the SAFT-VR equation of state. The perfluoroalkylalkanes were modeled as heterosegmented diblock chains using parameters for the alkyl and perfluoroalkyl segments developed in earlier work. Through this simple approach, we are able to predict the thermodynamic behavior of the perfluoroalkylalkanes studied without fitting to any experimental data for the systems being studied.
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