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Effects of Acoustic Barriers and Crosswind on the Operating Performance of Evaporative Cooling Tower Groups

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Journal of Thermal Science 2016年第6期25卷 532-541页

作者： DANG Chao jia li YANG lixin Institute of Thermal Engineering School of MechanicalElectronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China Beijing Key Laboratory of Flow and Heat Transfer of Phase Changing in Micro and Small Scale Beijing 100044China

Most evaporative cooling towers are arranged on building roof due to the limitation of space and noise,and acoustic barriers are always installed around cooling towers in practical *** existence of acoustic barriers and crosswind may affect the recirculation phenomenon which is directly related to the operating performance of cooling *** this study,a physical and mathematical computation model is proposed to research the crosswind and distance between acoustic barriers and inlet of cooling *** sensible and latent heat are considered in this *** reflux flow rate and performance ratio are obtained to evaluate the recirculation and operating performance,*** results show that the higher the crosswind velocity,the larger the reflux flow rate,and the lower the performance ratio of cooling tower *** high crosswind velocity,the presence of acoustic barriers is useful to inhibit reflux and improve operating performance,especially for ICE cooling tower *** addition,the optimum values are recommended for liBrllCE cooling tower groups in the research cases The variation of reflux flow rate and performance ratio with the acoustic barriers' distance presents a parabolic tendency.

关键词： tower barriers latent inlet facilities installed saturated outside enthalpy evaporation

Towards imbalanced motion:part-decoupling network for video portrait segmentation

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Science China(Information Sciences) 2024年第7期67卷 197-210页

作者： Tianshu YU Changqun XIA jia li State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and EngineeringBeihang University Peng Cheng Laboratory

Video portrait segmentation(VPS), aiming at segmenting prominent foreground portraits from video frames, has received much attention in recent years. However, the simplicity of existing VPS datasets leads to a limitation on extensive research of the task. In this work, we propose a new intricate large-scale multi-scene video portrait segmentation dataset MVPS consisting of 101 video clips in 7 scenario categories,in which 10843 sampled frames are finely annotated at the pixel level. The dataset has diverse scenes and complicated background environments, which is the most complex dataset in VPS to our best *** the observation of a large number of videos with portraits during dataset construction, we find that due to the joint structure of the human body, the motion of portraits is part-associated, which leads to the different parts being relatively independent in motion. That is, the motion of different parts of the portraits is imbalanced. Towards this imbalance, an intuitive and reasonable idea is that different motion states in portraits can be better exploited by decoupling the portraits into parts. To achieve this, we propose a part-decoupling network(PDNet) for VPS. Specifically, an inter-frame part-discriminated attention(IPDA)module is proposed which unsupervisedly segments portrait into parts and utilizes different attentiveness on discriminative features specified to each different part. In this way, appropriate attention can be imposed on portrait parts with imbalanced motion to extract part-discriminated correlations, so that the portraits can be segmented more accurately. Experimental results demonstrate that our method achieves leading performance with the comparison to state-of-the-art methods.

关键词： video portrait segmentation imbalanced motion unsupervised part decoupling motion correlation inter-frame attention

Effects of different courses of moxibustion treatment on intestinal flora and inflammation of a rat model of knee osteoarthritis

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Journal of Integrative Medicine 2022年第2期20卷 173-181页

作者： Ye-juan jia Tian-yu li Peng Han Yu Chen li-jia Pan Chun-sheng jia School of Acupuncture Moxibustion and TuinaHebei University of Chinese MedicineShijiazhuang 050200Hebei ProvinceChina

Objective:This study was done to determine the effects of different courses of moxibustion on a rat knee osteoarthritis(KOA)model,and explore the dose–effect relationship of moxibustion on KOA from the perspectives of intestinal flora and inflammatory ***:Wistar rats were randomly divided into five groups:normal,model,moxibustion for 2 weeks,moxibustion for 4 weeks and moxibustion for 6 weeks groups(n=5 each group).A KOA rat model was induced by monosodium iodoacetate,and moxibustion intervention was performed at the acupoints“Dubi”(ST35)and“Zusanli”(ST36),once every other *** changes in the cartilage of rat knee joints were assessed after intervention,and fecal samples were subjected to 16 S r RNA high-throughput sequencing for microbial diversity ***:Damage to the knee articular cartilage was obvious in the model group,which also had increased levels of pro-inflammatory factors,decreased levels of anti-inflammatory factors,and intestinal flora disorders with decreased *** degree of cartilage damage in the 4 and 6 weeks of moxibustion groups was significantly improved compared with the model *** 4 and 6 weeks of moxibustion groups also demonstrated reduced levels of interleukin-1βand tumor necrosis factor-a and increased levels of interleukin-10(Pligenes group and Ruminococcaceae UCG-014 increased,while that of the pathogenic bacteria Lachnospiraceae NK4 A136 group decreased(P<0.05).Although the abundance of Lachnospiraceae NK4 A136 group decreased in the 2 weeks of moxibustion group compared with the model group(P<0.05),there was no statistically significant difference in serum inflammatory factors,flora species diversity or degree of pathological damage compared with the model ***:Moxibustion treatment led to significant improvements in t

关键词： Knee osteoarthritis Different courses Moxibustion treatment Intestinal flora Inflammatory cytokines

Three divergent approaches identified the same RGF1 receptors in Arabidopsis thaliana

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Science China(life Sciences) 2017年第9期60卷 1040-1043页

作者： Yang Ou jia li Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations School of Life Sciences Lanzhou University Lanzhou 730000 China

During adaptation to terrestrial environment,plants evolved an important vegetative organ,root,to achieve immobilization,absorption of water and nutrients,biosynthesis,transportation and other physiological *** cell niche in root apical meristem,including quiescent center(QC)cells and their surrounding stem cells(Figure 1),is critical for normal root growth and *** of stem cells within the stem cell niche determine their cell fates.

关键词：拟南芥组织干细胞受体陆地环境营养器官植物进化生理功能固定化

Experimental Study on Thermal Management of Cylindrical li-ion Battery with Flexible Microchannel Plates

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Journal of Thermal Science 2020年第4期29卷 1001-1009页

作者： WEI liting jia li AN Zhoujian DANG Chao Institute of Thermal Engineering School of MechanicalElectronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China Beijing Key Laboratory of Flow and Heat Transfer of Phase Changing in Micro and Small Scale Beijing 100044China

A novel thermal management system of cylindrical li-ion battery with the liquid cooling in flexible microchannel plate was established in the study. The experiments were conducted with R141 b in flexible microchannel plates. The cooling system with the flexible aluminum microchannels can effectively transfer heat from battery to the cooling refrigerant R141 b based on flow boiling. A battery module with five cells along flow channel was chosen to study the effects of contact surface area and mass flux on the thermal performance and electrochemical characteristics in the experiments. Three types of structure with different contact areas were studied and their performances were compared with the experiments without cooling structures. The experiments were carried out at the same discharge rate with the inlet mass flow rates of 0–10 kg/h. For the inlet mass flow rate of 5.98 kg/h, the surface temperature and temperature uniformity of battery were the best, and the output voltage and capacity of batteries were higher than those under other mass flow rates. With given inlet mass flow rates, the five series cells exhibited different electrochemical performances, including output voltage and discharge capacity, due to the different refrigerant flow states in the microchannels. Finally, an optimal design was presented with thermal performances, macroscopic electrochemical characteristics, inlet mass flow rates and cooling performance taken into consideration.

关键词： thermal management li-ion battery flexible microchannels contact area

A novel blind deconvolution algorithm using single frequency bin

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第8期8卷 1271-1276页

作者： ZHANG Gui-bao li jia-wen li Cong-xin National Die ＆ Mold CAD Engineering Research Center Shanghai Jiao Tong University Shanghai 200030 China

Former frequency-domain blind devolution algorithms need to consider a large number of frequency bins and recover the sources in different orders and with different amplitudes in each frequency bin,so they suffer from permutation and amplitude indeterminacy troubles. Based on sliding discrete Fourier transform,the presented deconvolution algorithm can directly recover time-domain sources from frequency-domain convolutive model using single frequency bin. It only needs to execute blind sepa-ration of instantaneous mixture once there are no permutation and amplitude indeterminacy troubles. Compared with former algorithms,the algorithm greatly reduces the computation cost as only one frequency bin is considered. Its good and robust per-formance is demonstrated by simulations when the signal-to-noise-ratio is high.

关键词： Blind deconvolution Single frequency bin Convolutive mixture

Plant Mediator complex and its critical functions in transcription regulation

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Journal of Integrative Plant Biology 2016年第2期58卷 106-118页

作者： Yan Yang ling li li-jia Qu State Key Laboratory of Protein and Plant Gene Research Peking-Tsinghua Center for Life Sciences College of Life Sciences Peking University Beijing 100871 China The National Plant Gene Research Center (Beijing) Beijing 100101 China.

The Mediator complex is an important component of the eukaryotic transcriptional machinery. As an essential link between transcription factors and RNA polymerase II, the Mediator complex transduces diverse signals to genes involved in different pathways. The plant Mediator complex was recently purified and comprises conserved and specific subunits. It functions in concert with transcription factors to modulate various responses. In this review, we summarize the recent advances in understanding the plant Mediator complex and its diverse roles in plant growth, development, defense, non-coding RNA production, response to abiotic stresses, flowering, genomic stability and metabolic homeostasis. In addition, the transcription factors interacting with the Mediator complex are also highlighted.

关键词： Mediator complex transcription factors transcription regulation

Deep learning for code generation: a survey

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Science China(Information Sciences) 2024年第9期67卷 5-40页

作者： Huangzhao ZHANG Kechi ZHANG Zhuo li jia li jia li Yongmin li Yunfei ZHAO Yuqi ZHU Fang liU Ge li Zhi JIN Key Lab of High Confidence Software Technologies (Peking University) Ministry of Education School of Computer Science Peking University School of Computer Science and Engineering Beihang University

In the past decade, thanks to the powerfulness of deep-learning techniques, we have witnessed a whole new era of automated code generation. To sort out developments, we have conducted a comprehensive review of solutions to deep learning-based code generation. In this survey, we generally formalize the pipeline and procedure of code generation and categorize existing solutions according to taxonomy from perspectives of architecture, model-agnostic enhancing strategy, metrics, and tasks. In addition, we outline the challenges faced by current dominant large models and list several plausible directions for future research. We hope that this survey may provide handy guidance to understanding, utilizing, and developing deep learning-based code-generation techniques for researchers and practitioners.

关键词： code generation automated software engineering deep learning large model artificial intelligence

Synergistic promotion strategy of “dual-site” and “dual-path” to enhance the C–C coupling between CO2 and HCHO driven by photoelectrocatalysis

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Journal of Energy Chemistry 2025年第01期 39-49页

作者： Hongqiang Yang jianfeng Zheng Guoyu Wang Yifei Gao Yatao Yang jia li Xiaojin Han Yan Cui Zhanggen Huang National Key Laboratory of High Efficiency and Low Carbon Utilization of Coal Institute of Coal Chemistry Chinese Academy of Science University of Chinese Academy of Science Shenyang University of Chemical Technology

Photoelectrocatalytic coupling CO2and volatile organic compounds （VOCs） is a promising green strategy for the synergistic conversion of the two carbon-containing resources to *** catalytic efficiency is always at the mercy of chemical inertness of CO2and the competitive hydrogen evolution of ***,a modified g-C3N4/ZnAl-LDH Z-scheme heterojunction catalyst with dual reaction site was rationally designed and precisely *** Faraday efficiency of ethanol reached 68.67%with a corresponding formation rate of 227.3μmol *** revealed by in-situ characterizations and density functional theory calculations,CO2and HCHO were absorbed at Zn site and N site,***,*CO generated from CO2and HCHO was converted to*CH3O and*CHO on the dual-active-site *** detailed reaction mechanism experiments indicated that C–C coupling only occurred between*CO and*CH3O in electrocatalysis *** from the“*CO+*CH3O”path,another“*CO+*CHO”coupling path was also detected in photoelectrocatalytic *** selectivity of ethanol was significantly enhanced due to the synthesis of dual-site catalyst and the dual-path coupling path between CO2and HCHO simultaneously driven by light and electricity.

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