检索结果-南通市图书馆

Effects of Microwave Torrefaction with Mg（OH）2 on Characteristics of Bio-oil from Co-pyrolysis of Straw Stalk and Soapstock

在线全文

学校读者我要写书评

暂无评论

China Petroleum Processing & Petrochemical Technology 2019年第3期21卷 10-16页

作者： Wen Pingwei Zhou Yue dai leilei Wang Yunpu Liu Yuhuan Ruan Roger College of Chemistry and Chemical Engineering College of Life ScienceJiangxi Normal UniversityNanchang 330022 Engineering Research Center for Biomass Conversion Ministry of EducationNanchang UniversityNanchang 330047 Center for Biorefining and Department of Bioproducts and Biosystems Engineering University of MinnesotaMN 55108USA

This study investigated the effects of torrefaction with Mg(OH)2 on the properties of bio-oil formed from the microwave-assisted catalytic fast co-pyrolysis of straw stalk and *** effects of torrefaction temperature and residence time on the yield and composition of bio-oil were *** showed that the torrefaction temperature and residence time remarkably influenced the yield and composition of *** the increase in temperature and time,the bio-oil yield and the proportion of oxygen-containing compounds decreased,while the proportion of aromatic compounds *** the feedstocks were subject to torrefaction reaction for 20 min at 260°C,the proportion of oxygen-containing compounds decreased from 29.89%to 16.49%.Meanwhile,Mg(OH)2 could render the deoxidization function of torrefaction process increasingly *** proportion of the oxygen-containing compounds reached a minimum(14.41%),when the biomass-to-Mg(OH)2 ratio was 1:1.

关键词： microwave torrefaction Mg(OH)2 straw stalk soapstock bio-oil

Sliding behaviors of the trapezoidal roof rock block under a lateral dynamic disturbance

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2024年第3期16卷 741-760页

作者： Feng dai Wancheng Zhu Min Ren Shunchuan Wu leilei Niu Faculty of Land Resources Engineering Kunming University of Science and TechnologyKunming650093China Center for Rock Instability and Seismicity Research Department of Mining EngineeringSchool of Resource and Civil EngineeringNortheastern UniversityShenyang110819China

The surrounding rock of underground space is always affected by external dynamic disturbance from the side position,such as blasting vibration from a stope at the same level or seismic waves from adjacent strata.A series of laboratory tests,numerical simulations and theoretical analyses were carried out in this study to disclose the sliding mechanism of roof rock blocks under lateral ***,the experiments on trapezoidal key block under various clamping loads and disturbance were conducted,followed by numerical simulations using the fast Lagrangian analysis of continua(FLAC3D).Then,based on the conventional wave propagation model and the classical shear-slip constitutive model,a theoretical model was proposed to capture the relative displacement between blocks and the sliding displacement of the key *** results indicate that the sliding displacement of the key block increased linearly with the disturbance energy and decreased exponentially with the clamping load when the key block was disturbed to slide(without instability).Meanwhile,when the key block was disturbed to fall,two types of instability process may appear as immediate type or delayed *** addition,the propagation of stress waves in the block system exhibited obvious low-velocity and lowfrequency characteristics,resulting in the friction reduction effect appearing at the contact interface,which is the essential reason for the sliding of rock *** results can be applied to practical underground engineering and provide valuable guidance for the early detection and prevention of rockfalling disasters.

关键词： Lateral dynamic disturbance Trapezoidal rock block system Low-velocity and low-frequency wave Friction reduction effect Instability mode

Synthesis of Biodiesel Using ZrO_2 Polycrystalline Ceramic Foam Catalyst in a Tubular Reactor

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Petroleum Processing & Petrochemical Technology 2015年第3期17卷 67-75页

作者： Wang Yunpu Fan Liangliang dai leilei Liu Yuhuan Ruan Roger Liu Shitao Zhang Xueqin Wan Yiqin Nanchang University State Key Laboratory of Food Science and Technology Nanchang University Engineering Research Center for Biomass Conversion Ministry of Education Nanchang University School of Food Science Technology

With the help of the ceramic foam research efforts and preparation techniques, the ZrO2 polycrystalline ceramic foam catalyst was synthesized, and its characteristics, including the crystal structure, the phase composition, the acid–base properties, and the microstructure, were analyzed by XRD, SEM, Py-IR, and BET techniques. The performance of the ZrO2 polycrystalline ceramic foam catalyst in a tubular reactor was investigated via biodiesel synthesis using S. wilsoniana oil and methanol. The effects of reaction conditions(i.e., reaction temperature, reaction pressure, and volume ratio of methanol to S. wilsoniana oil) on transesterification efficiency were investigated, and the reaction conditions were optimized using RSM. The optimum reaction temperature, reaction pressure, and volume ratio of methanol to S. wilsoniana oil were determined to be 290 ℃, 10 MPa, and 4:1, respectively. Under this condition, the FAME content in the product oil reached 98.38%. The performance of the ZrO2 polycrystalline ceramic foam catalyst synthesized in this work for biodiesel synthesis from S. wilsoniana oil with a moisture content of 7.1% and an acid value of 130.697 mg KOH/g was examined, and the FAME content in the product oil was found to be 93% and 97.67%, respectively. The FAME content in the product oil exceeded 97% after five consecutive cycles(12 h per cycle of use) of the catalyst. The proposed catalyst represents a new type of solid catalyst with excellent acid resistance, water resistance, esterification efficiency, and catalytic stability.

关键词： ZrO2 polycrystalline ceramic foam catalyst tubular reactor S. wilsoniana oil biodiesel

Biorefinery process for production of bioactive compounds and bio-oil from Camellia oleifera shell

在线全文

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2019年第5期12卷 190-194页

作者： Yunpu Wang Linyao Ke Qi Yang Yujie Peng Yanzhe Hu leilei dai Lin Jiang Qiuhao Wu Yuhuan Liu Roger Ruan Guiming Fu State Key Laboratory of Food Science and Technology Nanchang UniversityNanchang 330047China Engineering Research Center for Biomass Conversion Ministry of EducationNanchang UniversityNanchang 330047China Center for Biorefining and Department of Bioproducts and Biosystems Engineering University of Minnesota 1390 Eckles Ave.St.PaulMN 55108USA

A biorefinery process was developed in this study to obtain bioactive compounds and bio-oil from Camellia oleifera *** different extraction techniques(water,ethanol,ultrasound-assisted deionized water,and ultrasound-assisted ethanol)were utilized to extract tea saponin and tannin from *** *** showed that ethanol had better extraction capacity than did deionized water,and ultrasound could promote the dissolution of tannin and tea saponin in *** thermogravimetric curves of the samples treated under the four conditions moved toward high *** phenomenon indicated the thermal stability of the residue was significantly *** pretreatment showed a slight effect on the chemical compositions of ***,the samples treated with ethanol and ultrasound-assisted deionized water contained higher phenol contents(81.07%and 81.52%,respectively)than the other *** content of organic acid decreased with an increase in the phenol content.

关键词： Camellia oleifera shell bio-oil bioactive compounds biorefinery ultrasound-assisted extraction pyrolysis

Microwave-assisted pyrolysis of vegetable oil soapstock:Comparative study of rapeseed,sunflower,corn,soybean,rice,and peanut oil soapstock

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2019年第6期12卷 202-208页

作者： Yunpu Wang Shumei Zhang Qiuhao Wu Dengle Duan Yuhuan Liu Roger Ruan Guiming Fu leilei dai Lin Jiang Zhenting Yu Zihong Zeng Xiaojie Tian Xiuhua Yang State Key Laboratory of Food Science and Technology Nanchang UniversityNanchang 330047China Engineering Research Center for Biomass Conversion Ministry of EducationNanchang UniversityNanchang 330047China Center for Biorefining and Department of Bioproducts and Biosystems Engineering University of Minnesota St.PaulMN 55108USA Department of Biological Systems Engineering Washington State UniversityRichlandWA 99354USA

In this study,the effects of catalytic temperature and the type of soapstock on products from microwave-assisted pyrolysis were ***-5 was used as the catalyst to study the pyrolysis of six different soapstocks at 200℃,300℃,and 400℃ catalytic *** showed that the bio-oil yields initially increased and then decreased with the increase in catalytic *** the catalytic temperature was 300℃,the bio-oil reached up to the maximum value(65.8 wt.%).Findings indicated that the composition of bio-oil was related to the degree of unsaturation of fatty acids sodium in the *** the case of saturated fatty acid sodium,a series of alkanes was formed,whereas the pyrolysis of monounsaturated fatty acid sodium resulted mainly in cycloalkanes,the cycloalkenes obtained from bio-oil was produced by polyunsaturated fatty acid sodium.

关键词： microwave pyrolysis vegetable oil soapstock HZSM-5 bio-oil

Near-field wideband beam training for ELAA with uniform circular array

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2024年第6期67卷 370-383页

作者： Yuhao CHEN Linglong dai Department of Electronic Engineering Tsinghua UniversityBeijing National Research Center for Information Science and Technology (BNRist)

Extremely large-scale antenna array(ELAA) at millimeter wave(mmWave) and Terahertz(THz)band has been considered a key technology for combating high attenuation in high-frequency bands in future6G communications. Uniform circular arrays(UCAs) have attracted much attention because of their ability to provide flat beamforming gain at all angles. To realize efficient beamforming, beam training is widely used to acquire channel state information. However, with a large antenna number, the beam training overhead in ELAA systems becomes overwhelming. Moreover, with a large bandwidth, the beam defocus effect severely degrades beam training accuracy. To address these issues, this paper proposes a frequency-dependent focusing(FDF)-based beam training scheme to realize effective beam training in near-field wideband ELAA systems with UCA. Specifically, we first analyze the FDF property of UCA, where signals at different subcarriers can simultaneously focus on different distances. Then, by exploiting the FDF property to search different distances using different subcarriers simultaneously, we design a hierarchical codebook and propose an FDFbased beam training scheme. To reveal the effectiveness of the proposed scheme, we compare its necessary beam training overhead with that of existing schemes. Finally, the simulation results demonstrate that the proposed scheme can achieve accurate beam training in near-field wideband UCA systems with a low beam training overhead.

关键词： extremely large-scale antenna array (ELAA) uniform circular array (UCA) near-field wideband beam training

Seismic performance evaluation of water supply pipes installed in a full-scale RC frame structure based on a shaking table test

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2024年第1期23卷 163-178页

作者： Wu Houli Guo Endong Wang Jingyi dai Xin dai Chenxi Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina Earthquake AdministrationHarbin 150080China Key Laboratory of Earthquake Disaster Mitigation Ministry of Emergency ManagementHarbin 150080China

As an important part of nonstructural components,the seismic response of indoor water supply pipes deserves much *** paper presents shaking table test research on water supply pipes installed in a full-scale reinforced concrete(RC)frame *** material pipes and different methods for penetrating the reinforced concrete floors are combined to evaluate the difference in seismic *** response spectra and pipe acceleration amplification factors based on test data are discussed and compared with code provisions.A seismic fragility study of displacement demand is conducted based on numerical *** acceleration response and displacement response of different combinations are *** results show that the combination of different pipe materials and different passing-through methods can cause obvious differences in the seismic response of indoor riser pipes.

关键词： water supply pipe different materials shaking table test amplification factor seismic fragility

Biohythane production from two-stage anaerobic digestion of food waste:A review

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第5期139卷 334-349页

作者： Xiaona An Ying Xu Xiaohu dai State Key Laboratory of Pollution Control and Resource Reuse School of Environmental Science and EngineeringTongji UniversityShanghai 200092China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

The biotransformation of food waste(FW)to bioenergy has attracted considerable research attention as a means to address the energy crisis and waste disposal *** this end,a promising technique is two-stage anaerobic digestion(TSAD),in which the FW is transformed to biohythane,a gaseous mixture of biomethane and *** review summarises the main characteristics of FW and describes the basic principle of ***,the factors influencing the TSAD performance are identified,and an overview of the research status;economic aspects;and strategies such as pre-treatment,co-digestion,and regulation of microbial consortia to increase the biohythane yield from TSAD is ***,the challenges and future considerations associated with the treatment of FW by TSAD are *** paper can provide valuable reference for the improvement and widespread implementation of TSAD-based FW treatment.

关键词： Two-stage anaerobic digestion(TSAD) Food waste(FW) Methane production Hydrogen production

Design-Oriented Thermodynamic Analysis of Novel Heat-Integrated C5 Isomeride Distillation Scheme on Pilot Scale

在线全文

学校读者我要写书评

暂无评论

Transactions of Tianjin University 2016年第1期22卷 77-82页

作者：孙津生戴雷雷马婷婷郭长宁卫宏远李正虎 School of Chemical Engineering and Technology Tianjin University Sinopec Jinling Petrochemical Co. Ltd Ningbo Xinlongxin Chemical Co. Ltd

A novel heat-integrated distillation scheme on pilot scale for producing C5 foaming agent, a mixture of isopentane and pentane in a certain proportion, was proposed with the aid of process simulation. Compared with the conventional distillation scheme, C5 foaming agent was directly separated at the top of the original isopentane or pentane column in the novel scheme, instead of first refining the two isomerides to high purities and then mixing them into final products. This improvement reduced the difficulty of the separation and avoided meaningless exergy loss caused by re-mixing, which finally contributed to an energy-efficient design by a big margin. Moreover, the column grand composite curves(CGCCs)were used to modify all distillation columns, indicating that there is potential to improve the energy efficiency further. Therefore, double-effect, or heat-integrated distillation was also adopted. Energy and exergy analyses were then conducted to evaluate the effectiveness of the proposed scheme for the purpose of energy saving. The simulation results of the conventional distillation scheme were in agreement with its on-site counterpart. Analyses showed that the novel heat-integrated scheme reduced hot utility by 27.12%,, cold utility by 24.49%,, and total exergy loss by 23.95%,.

关键词： C5 foaming agent process simulation energy saving column grand composite curve(CGCC) exergy analysis