|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Catalytic fast pyrolysis of walnut shell for alkylphenols production with nitrogen-doped activated carbon catalyst显示文摘Alkylphenols are a group of valuable phenolic compounds that can be derived from lignocellulosic biomass.In this study,three activated carbons(ACs)were prepared for catalytic fast pyrolysis(CFP)of walnut shell to produce alkylphenols,including nitrogen-doped walnut shell-derived activated carbon(N/WSAC),nitrogen-doped rice husk-derived activated carbon(N/RHAC)and walnut shell-derived activated carbon(WSAC).Pyrolysis-gas chromatography/mass spectrometry(Py-GC/MS)experiments were carried out to reveal the influences of AC type,pyrolytic temperature,and AC-to-walnut shell(AC-to-WS)ratio on the product distributions.Results showed that with nitrogen doping,the N/WSAC possessed stronger capability than WSAC toward the alkylphenols production,and moreover,the N/WSAC also exhibited better effects than N/RHAC to prepare alkylphenols.Under the catalysis of N/WSAC,yields of alkylphenols were significantly increased,especially phenol,cresol and 4-ethylphenol.As the increase of pyrolytic temperature,the alkylphenols yield first increased and then decreased,while high selectivity could be obtained at low pyrolytic temperatures.Such a trend was also observed as the AC-to-WS ratio continuously increased.The alkylphenols production achieved a maximal yield of 44.19 mg/g with the corresponding selectivity of 34.7%at the pyrolytic temperature of 400℃and AC-to-WS ratio of 3,compared with those of only 4.67 mg/g and 6.1%without catalyst.In addition,the possible formation mechanism of alkylphenols was also proposed with the catalysis of N/WSAC. | Shanwei Ma Hang Li Guan Zhang Tahir Iqbal Kai Li Qiang Lu | 2021 | Frontiers of Environmental Science & Engineering2021，15，2： | 1 |
| 2 | Performance Improvement of Single Screw Compressor by Meshing Clearance Adjustment Used in Refrigeration System显示文摘The single screw compressor(SSC)is widely used in air compression and refrigeration systems due to its many advantages.The meshing clearance between the screw groove and gate rotor teeth flank has a significant influence on the compressor performance.In this paper,mathematical calculation models describing the internal working process of the SSC are established in order to evaluate the thermal dynamic characteristics of the compressor under varying meshing clearance heights.The refrigerating capacity,volume efficiency and adiabatic efficiency of the SSC are calculated and discussed.Three prototypes,with different meshing clearance heights,were manufactured to study the internal influence mechanisms.The theoretical model was verified using experimental data and the calculation results strongly agreed with the experimental results.Results demonstrate that comparisons of volume efficiency and adiabatic efficiency between the measured and calculated results exhibited deviations of 3.64%-7.98%and 5.92%-9.4%,respectively.Based on the models,analysis under varying meshing clearance heights and working conditions was performed.Taking into account working performance,actual manufacturing conditions and manufacturing cost limitations,a meshing clearance height range from 0.01 mm to 0.08 mm is suggested.This study can provide important theoretical data and experimental support for the design,manufacturing and optimization of single screw compressors. | LU Yuanwei LIU Shanwei WU Yuting LEI Biao ZHI Ruiping WEN Qiangyu MA Chongfang | 2021 | Journal of Thermal Science2021，30，1： | 1 |
| 3 | Design of continuous long slot leaky-wave antenna for millimeter wave application显示文摘A simple and efficient design scheme of the continuous long slot leaky-wave antenna is developed. The key steps involved in the scheme are summarized. First, the cut-off frequencies of slot waveguides with different slot offsets are obtained by 3D finite-difference time-domain (FDTD) method. Second, the attenuation functionαra is estimated by the aperture distribution, and the attenuation functionαrs is determined by the slot radiation. Finally, the attenuation functionαra is combined with the attenuation functionαrs by the coefficient K. And an example in Ka band is presented. Moreover, the return loss of the E-plane Tee-junction (ET) and the radiation pattern of leaky-wave antenna are simulated. The scheme is verified by comparing with the experimental result. | LU Shanwei Zhang Yan Liu Juan Zhang Jiangling | 2007 | Journal of Systems Engineering and Electronics2007，18，4： | 1 |
| 4 | The Equivalent Parameters for the Narrow Series Slot on a Sectoral Waveguide显示文摘TheEquivalentParametersfortheNarrowSeriesSlotonaSectoralWaveguideLuShanwei,ZhuangYan&GaoWenjunDept.ofElect.Eng.,BeijingUniver... | Lu Shanwei, Zhuang Yan & Gao Wenjun ( Dept. of Elect. Eng., Beijing University of Aeronautics and Astronautics, 100083, P. R. China ) | 1997 | Journal of Systems Engineering and Electronics1997，8，1： | 0 |
| 5 | The Application of GTD to the Design of Chokes Horn显示文摘TheApplicationofGTDtotheDesignofChokesHornSuDonglin;XieYulan;andLuShanwei(P.O.Box205,BeijingUniversityofAeronauticsandAstrona... | Su Donglin Xie Yulan and Lu Shanwei (P.O.Box 205, Beijing University of Aeronautics and Astro nautics, Beijing (100083), PRC) | 1994 | Journal of Systems Engineering and Electronics1994，5，2： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员