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Comparison study of thermal comfort and energy saving under eight different ventilation modes for space heating

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Building Simulation 2022年第7期15卷 1323-1337页

作者： Xiangfei Kong Yufan Chang nana li Han li Wei li School of Energy and Environmental Engineering Hebei University of TechnologyTianjin 300401China North China Municipal Engineering Design&Research Institute Co. Ltd.Tianjin 300110China

The relative location of inlets and outlets plays an important role in thermal comfort and energy conservation under ventilation modes for the building non-uniform indoor ***,a comparison study of thermal comfort and energy efficiency of eight widely-used ventilation modes for space heating was conducted in this *** subjective experiments and verified computational fluid dynamics(CFD)models were carried *** the subjective experiments,the vote of local thermal sensation(LTS),overall thermal sensation(OTS)and draft sensation were *** the CFD simulations,RNG κ-ε model was applied to compare and analyze the air temperature field,turbulence intensity,ventilation effectiveness and air diffusion performance index(ADPI).The thermal comfort results showed that the air inlets are better located at the mid-height level of a wall,and the outlets are located at the same or higher *** the results of the energy efficiency suggested that the inlets are better installed at the lower level of a wall,and the outlets should be placed far from the *** the results were conflict,the economic-comfort ratio was introduced to calculate and compare the thermal comfort and energy efficiency *** final results concluded that it can achieve excellent thermal comfort performance without sacrificing energy efficiency when the inlets are at the height of 1.2 m of the front wall,and the outlets are at 1.2 m height of the back *** it is the best choice for the winter air distribution in northern *** study can offer a guideline for the air terminal arrangements in non-uniform ventilation under heating mode.

关键词： non-uniform ventilation air terminal positions thermal comfort energy saving subjective experiment

A Study on Iterative Learning Control for Nonlinear Impulsive Fractional Differential Systems

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Wuhan University Journal of Natural Sciences 2020年第6期25卷 496-500页

作者： li nana School of Information and Network Engineering Anhui Science and Technology University School of Information and Network EngineeringAnhui Science and Technology UniversityBengbu 233030AnhuiChina

This paper explores P-type learning laws for impulsive nonlinear fractional differential *** order to prove the convergence of the system in P-type learning laws,we refer to the various properties of fractional systems and *** sufficient conditions of iterative learning control is ***,we give an example to illustrate theoretical results.

关键词： impulsive iterative learning control fractional differential systems

Design and implementation of a high-speed reconfigurable cipher chip

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Journal of Systems Engineering and Electronics 2006年第4期17卷 712-716页

作者： Gao nana li Zhancai Wang Qin Information Technology School Beijing Univ. of Science & Technology Beijing 100083 P.R.China.

A reconfigurable cipher chip for accelerating DES is described, 3DES and AES computations that demand high performance and flexibility to accommodate large numbers of secure connections with heterogeneous clients. To obtain high throughput, we analyze the feasibility of high-speed reconfigurable design and find the key parameters affecting throughput. Then, the corresponding design, which includes the reconfignration analysis of algorithms, the design of reconfignrable processing units and a new reconfignrable architecture based on pipeline and parallel structure, are proposed. The implementation results show that the opcrating fiequency is 110 MHz and the throughput rate is 7 Gbps for DES, 2.3 Gbps for 3 DES and 1.4 Gbps for AES. Compared with the similar existing implementations, our design can achieve a higher performance.

关键词： reconfigurable cipher chip DES AES.

Impact of Local Climate Zones on the Urban Heat and Dry Islands in Beijing:Spatial Heterogeneity and Relative Contributions

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Journal of Meteorological Research 2024年第1期38卷 126-137页

作者： Zuofang ZHENG Fu LUO nana li Hua GAO Yuanjian YANG Institute of Urban Meteorology China Meteorological AdministrationBeijing 100089 School of Atmospheric Physics Nanjing University of Information Science&TechnologyNanjing 210044 Key Laboratory of Urban Meteorology China Meteorological AdministrationBeijing 100089

Based on the building height and density data on a 100-m resolution,hourly 2-m temperature and humidity data at83 automatic weather stations,and gridded local climate zone(LCZ)data on a 120-m resolution in urban Beijing in2020,this study first employs the semivariogram combined with building parameters to calculate spatial correlations and has identified an LCZ grid resolution of 500 m suitable for best usage of the available observation ***,how the spatially heterogeneous LCZs affect and contribute to the canopy urban heat island intensity(UHII)and urban dry island intensity(UDII)are quantitatively *** is found that UHII is high in winter and low in summer with a unimodal diurnal variation while UDI is low in winter but high in summer with a bimodal diurnal *** LCZ with compact mid-rise(open high-rise)buildings exhibits the highest UHII(UDII),followed by the compact high-rise(compact low-rise),while the LCZ of scattered trees presents both the lowest UHII and the lowest *** most significant difference in the UHII(UDII)among the nine LCZ types in the urban area of Beijing is2.62℃(1.1 g kg^(-1)).Area-weighted averaging analysis reveals that the open mid-rise LCZ is the most significant contributor to the UHII(UDII),immediately followed by compact mid-rise(open low-rise),with the least contribution from bare rock or paved(scattered trees).The results also indicate that beyond the intrinsic physical properties of the LCZs of a city,their area proportions cannot be overlooked in evaluating their impact on the UHI and *** quantitatively findings could help urban planners to create a livable urban climate and environment by adjusting the relevant land use.

关键词： local climate zone(LCZ) urban heat island(UHI) urban dry island(UDI) distribution pattern contribution rate Beijing

A special solution to transmission capacity of ad hoc networks

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High Technology Letters 2011年第1期17卷 64-68页

作者：陈昌海 Yin Changchuan li nana Yue Guangxin Key Laboratory of Universal Wireless Communications Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 P. R. China School of Computer and Communication Engineering Zhengzhou University of Light Industry Zhengzhou 450002P. R. China

This paper presents an approximate expression to transmission capacity of ad hoc networks by using stochastic geometry. For there is no general close-form expression to the transmission capacity of ad hoc networks, by using Taylor series, we obtain the exact series expression to transmission capacity first, then we take partial summation to yield an n-th order approximate expression. Further- more, compared with the exact expression under a special case, the accuracy of the n-th order ap- proximation has been studied. The numerical results show that the accuracy of the approximation is mainly determined by the order n, and a high accuracy can be obtained when the node density or the outage constraint is close to zero .

关键词： ad hoc transmission capacity outage constraint approximation normalized interference

Offlattice Model in the Prediction of Protein 3D Structure

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Wuhan University Journal of Natural Sciences 2007年第2期12卷 235-238页

作者： SHI Feng li nana NIU Xiaohui School of Science Huazhong Agricultural University Wuhan 430070 Hubei China

3-dimension HPNX offiattice model is developed from the 2-dimension HP offiattice model. In the HP model, 20 types of amino acid monomers are divided into two classes, H （non-polar monomer） and P （polar monomer）. In the HPNX model, polar monomers are split into positively charged （P）, negatively charged （N） and neutral （X） monomers. A new evolutionary algorithm is applied to study long chains of the HPNX offiattice protein model. This method successfully predict the structures of several proteins in the 3-dimension space that are similar to the structures gotten by X-Ray Crystallography and NMR and published in the PDB（Protein Data Bank）.

关键词： offlattice protein folding 3D structure

A constitutive serine protease inhibitor suppresses herbivore performance in tea(Camellia sinensis)

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Horticulture Research 2023年第10期10卷 112-122页

作者： Meng Ye Chuande liu nana li Chenhong Yuan Miaomiao liu Zhaojun Xin Shu Lei Xiaoling Sun Key Laboratory of Biology Genetics and Breeding of Special Economic Animals and PlantsMinistry of Agriculture and Rural AffairsNational Center for Tea Plant ImprovementTea Research InstituteChinese Academy of Agricultural SciencesHangzhou 310008China

Protease inhibitors promote herbivore resistance in diverse plant *** many inducible protease inhibitors have been identified,there are limited reports available on the biological relevance and molecular basis of constitutive protease inhibitors in herbivore ***,we identified a serine protease inhibitor,CsSERPIN1,from the tea plant(Camellia sinensis).Expression of CsSERPIN1 was not strongly affected by the assessed biotic and abiotic *** vitro and in vivo experiments showed that CsSERPIN1 strongly inhibited the activities of digestive protease activities of trypsin and *** or heterologous expression of CsSERPIN1 significantly reduced herbivory by two destructive herbivores,the tea geometrid and fall armyworm,in tea and Arabidopsis plants,*** expression of CsSERPIN1 in Arabidopsis did not negatively influence the growth of the plants under the measured *** findings suggest that CsSERPIN1 can inactivate gut digestive proteases and suppress the growth and development of herbivores,making it a promising candidate for pest prevention in agriculture.

关键词： protease Arabidopsis Camellia

Preparation of Modified Enteromorpha-Immobilized Microbial Agent and Research on Diesel Removal Performance

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China Petroleum Processing & Petrochemical Technology 2021年第3期23卷 151-160页

作者： Yang Yuping li nana Duan Weichao An Chenye Xue Jianliang Jiang Qing Cheng Dongle Shen Chanchan College of Safety and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590 Qingdao Oasis Environmental&Safety Technology Co. Ltd.Qingdao 266555 Centre for Technology in Water and Wastewater School of Civil and Environmental EngineeringUniversity of Technology SydneySydneyNWS 2007Australia College of City and Architecture Engineering Zaozhuang UniversityZaozhuang 277160

Offshore oil pollution has caused serious impacts on plants and aquatic organisms in the marine *** of oil pollution by immobilized bacteria has aroused wide attention due to the high degradation rate compared with free *** properties of the carrier for immobilization play an important role in the oil degradation *** our study,a marine oil degrading bacteria Sp8(Shewanella algae)was selected from sea water,and enteromorpha was used as carrier material for the immobilization of *** order to increase the hydrophobicity,sodium dodecylbenzene sulfonate(SDBS)was used as modifier to modify the surface of enteromorpha by the dipping *** alginate was used as the embedding carrier,and anhydrous calcium chloride was used as the cross-linking agent to prepare the SDBS-E immobilized microbial agent by the embedding *** with the degradation rate achieved by free bacteria(78.87±8.29%),the diesel removal rate accomplished by SDBS-E immobilized microbial agent increased to 90.39±1.24%.The analysis of diesel removal mechanism showed that the diesel removal pathway mainly included surface adsorption,internal uptake,and *** diesel removal efficiency relied on surface adsorption in the early stage,and then depended on biodegradation in the later *** removal of diesel by SDBS-E immobilized microbial agent conformed to the quasi-first-order degradation kinetic *** results of software-MOE suggested that enteromorpha-immobilized microbial agent adsorbed diesel mainly through hydrogen bonds formed with diesel *** study can provide a research basis and idea for the practical application of immobilization technology to remove petroleum from seawater in the future.

关键词： bioremediation immobilization diesel degradation enteromorpha modification

A model for thermal annealing on forming In—N clusters in InGaNP

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Science China(Physics,Mechanics & Astronomy) 2012年第5期55卷 798-801页

作者： ZHAO ChuanZhen CHEN Lei li nana ZHANG HuanHuan CHEN YaFei WEI Tong TANG ChunXiao XIE Zili School of Electronics and Information Engineering Tianjin Polytechnics UniversityTianjin 300160China School of Textiles Tianjin Polytechnic UniversityTianfin 300160China Key Laboratory of Advanced Textile Composites Ministry of Education of ChinaTianjin 300160China College of Science Civil Aviation University of ChinaTianjin 300300China Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials Department of Electronic Science and EngineeringNanjing UniversityNanjing 210093China

We develop a model for the effect of thermal annealing on forming In--N dusters in GalnNP according to thermodynamics. The average energy variation for forming an In--N bond in the model is estimated according to the theoretical calculation. Using the model, the added number of In--N bonds per mol of InGaNP, the added number of nearest-neighbor In atoms per N atom and the average number of nearest-neighbor In atoms per N atom after annealing are calculated. The different function of In--N clusters in InGaNP and InGaN is also discussed, which is due to the different environments around the In--N clusters.

关键词： InGaNP annealing In--N clusters thermodynamics