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Research on fault detection method for heat pump air conditioning system under cold weather

Chinese Journal of Chemical Engineering 2017年第12期25卷 1812-1819页

作者： Liangliang Sun jianghua wu Haiqi Jia Xuebin Liu Information and Control Engineering Shenyang Jianzhu University Electrical Engineering University of Connecticut

Building energy consumption accounts for nearly 40% of global energy consumption, HVAC （Heating, Ventilating, and Air Conditioning） systems are the major building energy consumers, and as one type of HVAC systems, the heat pump air conditioning system, which is more energy-efficient compared to the traditional air conditioning system, is being more widely used to save energy. However, in northern China, extreme climatic conditions increase the cooling and heating load of the heat pump air conditioning system and accelerate the aging of the equipment, and the sensor may detect drifted parameters owing to climate change. This non-linear drifted parameter increases the false alarm rate of the fault detection and the need for unnecessary troubleshooting. In order to overcome the impact of the device aging and the drifted parameter, a Kalman filter and SPC （statistical process control） fault detection method are introduced in this paper. In this method, the model parameter and its standard variance can he estimated by Kalman filter based on the gray model and the real-time data of the air conditioning system. Further, by using SPC to construct the dynamic control limits, false alarm rate is reduced. And this paper mainly focuses on the cold machine failure in the component failure and its soft fault detection. This approach has been tested on a simulation model of the ＂Sino-German Energy Conservation Demonstration Center＂ building heat pump air-conditioning system in Shenyang, China, and the results show that the Kalman filter and SPC fault detection method is simple and highly efficient with a low false alarm rate, and it can deal with the difficulties caused by the extreme environment and the non-linear influence of the parameters, and what＇s more, it provides a good foundation for dynamic fault diagnosis and fault prediction analysis.

关键词： Fault detection Cold machine Kalman filter Statistical process control Dynamic control

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Unlocking high-rate O3 layered oxide cathode for Na-ion batteries via ion migration path modulation

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Journal of Energy Chemistry 2023年第8期83卷 53-61,I0004页

作者： Guoliang Liu Weile Xu jianghua wu Yong Li Liping Chen Shuyue Li Qinghui Ren Juan Wang Shaanxi Key Laboratory of Nanomaterials and Nanotechnology Xi'an University of Architecture and TechnologyXi'an 710055ShaanxiChina

O3-NaNi1/3Fe1/3Mn1/3O2is a promising layered cathode material with high specific capacity,low cost,and simple ***,sluggish kinetic hindrance is attributed to the size discrepancy between the large Na-ion and narrow tetrahedral interstitial positions,leading to inferior rate capacity and low reversible ***,F with light-weight and strong electronegativity is introduced to substitute O atoms in the bulk structure,which intensifies the bond strength of transition metal and oxygen and enlarges the Na+diffusion *** addition,density-functional theory(DFT) calculations demonstrate that the electrostatic interaction is weakened between Na+in the tetrahedral site and the transitionmetal cation directly below it,dramatically reducing the migration barriers of Na+***,the as-obtained NaNi1/3Fe1/3Mn1/3O1.95F0.05sample displays outstanding rate performance of 86.7 mA h g^(-1)at 10 C and excellent capacity retention of 84.1% after 100 cycles at 2 ***,a full cell configuration using a hard carbon anode reaches the energy density of 307.7 Wh kg^(-1).This strategy paves the way for novel means of modulating the Na-ion migration path for high-rate O3-type layered cathode materials.

关键词： Sodium-ion batteries Layered cathode material Fdoping Kinetic hindrance lon migration path

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Tuning dual-atom mediator toward high-rate bidirectional polysulfide conversion in Li-S batteries

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Journal of Energy Chemistry 2023年第12期87卷 462-472,I0012页

作者： Yifan Ding Zhongti Sun jianghua wu Tianran Yan Lin Shen Zixiong Shi Yuhan wu Xiaoqing Pan Liang Zhang Qiang Zhang Jingyu Sun College of Energy Soochow Institute for Energy and Materials InnovationsKey Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu ProvinceSoochow UniversitySuzhou 215006JiangsuChina School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina National Laboratory of Solid-State Microstructures Jiangsu Key Laboratory of Artificial Functional MaterialsCollege of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093JiangsuChina Institute of Functional Nano&Soft Materials Jiangsu Provincial Key Laboratory for Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhou 215006JiangsuChina Department of Chemical Engineering Tsinghua UniversityBeijing 100084China

An emerging practice in the realm of Li-S batteries lies in the employment of single-atom catalysts(SACs)as effective mediators to promote polysulfide conversion,but monometallic SACs affording isolated geometric dispersion and sole electronic configuration limit the catalytic benefits and curtail the cell ***,we propose a class of dual-atom catalytic moieties comprising hetero-or homo-atomic pairs anchored on N-doped graphene(NG)to unlock the liquid–solid redox puzzle of sulfur,readily realizing Li-S full cell under high-rate-charging *** for Fe-Ni-NG,in-depth experimental and theoretical analysis reveal that the hetero-atomic orbital coupling leads to altered energy levels,unique electronic structures,and varied Fe oxidation states in comparison with homo-atomic structures(FeFe-NG or Ni-Ni-NG).This would weaken the bonding energy of polysulfide intermediates and thus enable facile electrochemical kinetics to gain rapid liquid-solid Li_(2)S_(4)?Li_(2)S ***,a Li-S battery based on the S@Fe-Ni-NG cathode demonstrates unprecedented fast-charging capability,documenting impressive rate performance(542.7 mA h g^(-1)at 10.0 C)and favorable cyclic stability(a capacity decay of 0.016%per cycle over 3000 cycles at 10.0 C).This finding offers insights to the rational design and application of dual-atom mediators for Li-S batteries.

关键词： Li-S batteries Reaction kinetics Dual-atom Rate-determining step High-rate performance

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New developments of MSRT's working modes:One-dimen-sional radio heliograph and IPS telescope

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Chinese Science Bulletin 2001年第19期46卷 1598-1603页

作者： ZHANG Xizheng wu jianghua CHEN Hongsheng ZHENG Yijia PIAO Tingyi WANG Xinmin National Astronomical Observatory Chinese Academy of Sciences(CAS)Beijing 100012China Beijing Astrophysics Center CAS and Peking UniversityBeijing 100012China

This note introduces the newly developed working modes, i.e. one-dimensional meter-wave radio heliograph (MRH) and interplanetary scintillation (IPS) telescope, of meter-wave aperture synthesis radio telescope (MSRT) at Beijing Astronomical Observatory (BAO). The note describes briefly the scientific objectives, configurations of the hardware and software, and functions of the system. It presents the examples of observations on solar meter-wave bursts and IPS with the two new working modes. The results indicated that new modes not only can provide the information on the evolution of solar activities with space and time, but also can trace and monitor the propagation and spatial distribution of interplanetary plasma shock resulting from solar activities and the instability of the ionosphere, etc. Both modes are new facilities that could fill the gaps in scientific frontiers.

关键词： radio telescope solar activity radio burst IPS observational mode.

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Self-templated formation of twin-like metal-organic framework nanobricks as pre-catalysts for efficient water oxidation

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Nano Research 2022年第4期15卷 2887-2894页

作者： Fei-Xiang Ma Fucong Lyu Yingxue Diao BinBin Zhou jianghua wu Fengwen Kang Zebiao Li Xufen Xiao Peng Wang Jian Lu Yang Yang Li Centre for Advanced Structural Materials City University of Hong Kong Shenzhen Research InstituteGreater Bay Joint DivisionShenyang National Laboratory for Materials ScienceShenzhen 518057China Hong Kong Branch of National Precious Metals Material Engineering Research Center City University of Hong KongHong Kong 999077China Department of Mechanical Engineering City University of Hong KongGreater Bay Joint DivisionShenyang National Laboratory for Materials ScienceHong Kong 999077China Department of Material Science and Engineering City University of Hong KongHong Kong 999077China National Laboratory of Solid State Microstructures College of Engineering and Applied SciencesCollaborative Innovation Center of Advanced Microstructures and Center for the Microstructures of Quantum MaterialsNanjing UniversityNanjing 210093China CityU-Shenzhen Futian Research Institute No.3Binglang RoadFubao StreetFutian DistrictShenzhen 518045China

Fabrication of single-crystalline metal-organic framework(MOF)hollow nanostructures with two-dimensional(2D)morphologies is a challenging ***,twin-like MOF nanobricks,a quasi-hollow 2D architecture,with multi-metal nodes and replaceable organic ligands,are uniformly and firmly grown on conductive Ni foam through a generic one-pot *** formation process of twin-like MOF nanobricks mainly includes selective epitaxial growth of Fe-rich MOF layer and simultaneously dissolution of the pre-formed Ni-rich metal-organic frameworks(MOFs),all of which can be ascribed to a special self-templated *** fantastic structural merits of twin-like MOF nanobrick arrays,featuring highly exposed active sites,remarkable electrical conductivity,and hierarchical porosities,enable this material for efficient *** bimetallic NiFe-MOFs grown on Ni foam as an example,the resultant twin-like nanobrick arrays can be directly utilized as three-dimensional(3D)integrated electrode for high-performance water oxidation in 1 M KOH with a low overpotential,fast reaction kinetics(28.5 mV·dec^(-1)),and superb ***,the unstable NiFe-MOFs were served as an oxygen evolution reaction(OER)pre-catalyst and the single-crystalline NiFe-MOF precursor can be in-situ topochemically regulated into porous and lowcrystalline NiFeOx nanosheets during the OER *** work extends the hollowing strategy to fabricate hollow MOFs with 2D architectures and highlights their direct utilization for advanced electrocatalysis.

关键词： twin-like structures metal-organic frameworks oxygen evolution reaction self-templated pre-catalysts

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The correlation and overlaps between PD-L1 expression and classical genomic aberrations in Chinese lung adenocarcinoma patients: a single center case series

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Cancer Biology & Medicine 2019年第4期16卷 811-821页

作者： jianghua wu Wei Sun Haiyue Wang Xiaozheng Huang Xinyu Wang Weiyang Jiang Ling Jia Ping Wang Qin Feng Dongmei Lin Department of Pathology Peking University Cancer Hospital&InstituteKey Laboratory of Carcinogenesis and Translational Research(Ministry of Education)Beijing 100142China Department of Pathology Tianjin Medical University Cancer Institute and HospitalNational Clinical Research Center of CancerKey Laboratory of Cancer Prevention and TherapyTianjin 300060China

Objective:To investigate the correlation and overlaps between PD-L1 expression and classical genomic aberrations in Chinese lung adenocarcinoma(LADC)***:We reviewed 428 consecutive,surgically resected cases of LADC from October 2015 to December 2016 from our ***-L1 expression was evaluated based on tumor proportion score(TPS).Correlation and co-occurrence of PD-L1 expression level with those of classical driver genes,such as EGFR,ALK,ROS-1,and KRAS and with clinical variables and disease-free survival(DFS)were ***:Seventy of the 428 cases(16.4%)showed TPS≥1%,and 21 cases(4.9%)showed TPS≥50%.PD-L1 positive expression was significantly associated with male gender,smoking,advanced TNM stage,and solid histologic *** TPS≥1% and ≥50%were correlated with the absence of an EGFR mutation(P<0.001)and the presence of ALK rearrangement(P=0.024).KRAS mutation was associated with TPS≥50%(P=0.035).PD-L1 positivity commonly overlapped with the alterations of classical driver oncogenes(58.5%with TPS≥1% and 42.9% with TPS≥50%).Approximately three-quarters of PD-L1 positive cases co-occurred with classical therapeutic-gene aberrations in cases with stage III/IV cancer or cancer *** could be divided into four subgroups based on the expression profile of current routine biomarkers for potential therapeutic ***:PD-L1 expression is not only closely correlated with classic gene alterations but also commonly overlaps with the aberrations of classical driver oncogenes in Chinese LADC *** findings provide a useful overview of clinical strategies that rely on the profile of routinely used molecular biomarkers.

关键词： Lung adenocarcinoma PD-L1 expression classical genomic aberrations molecular biomarkers

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Forecast of Observing Time Delay of Strongly Lensed Quasars with the Muztagh-Ata 1.93m Telescope

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Research in Astronomy and Astrophysics 2023年第3期23卷 1-15页

作者： Shanhao Zhu Yiping Shu Haibo Yuan Jian-Ning Fu Jian Gao jianghua wu Xiangtao He Kai Liao Guoliang Li Xinzhong Er Bin Hu Institute for Frontier in Astronomy and Astrophysics Beijing Normal UniversityBejing 102206China Department of Astronomy Beijing Normal UniversityBeijing 100875China Max-Planck-Institut für Astrophysik Karl-Schwarzschild-Str.1D-85748 GarchingGermany Ruhr University Bochum Faculty of Physics and AstronomyAstronomical Institute(AIRUB)German Centre for Cosmological LensingD-44780 Bochum German School of Physics and Technology Wuhan UniversityWuhan 430072China Purple Mountain Observatory Chinese Academy of SciencesNanjing 210023.China South-Western Institute for Astronomy Research Yunnan UniversityKunming 650500China

As a completely independent method,the measurement of time delay of strongly lensed quasars(TDSL)are crucial to resolve the Hubble *** monitoring is required but so far limited to a small sample of strongly lensed *** with several partner institutes,Beijing Normal University is constructing a 1.93 m reflector telescope at the Muztagh-Ata site in west China,which has the world class observing conditions with median seeing of 082 and median sky brightness of 21.74 mag arcsec-2 in V-band during the dark *** telescope will be equipped with both a three-channel imager/photometer which covers 3500–11,000?wavelength band,and a low-medium resolution(λ/δλ=500/2000/7500)*** this paper,we investigate the capability of the Muztagh-Ata 1.93 m telescope in measuring time delays of strongly lensed *** generate mock strongly lensed quasar systems and light curves with microlensing effects based on five known strongly lensed quasars,i.e.,RX J1131-1231,HE 0435-1223,PG 1115+080,WFI 2033-4723 and SDSS 1206+*** particular,RX J1131-1231 is generated based on the lens modeling results of Suyu et *** to the lack of enough information,the other four systems are calculated by a simple analytical *** to simulations,for RX J1131-like systems(wide variation in time delay between images)the TDSL measurement can be achieved with the precision aboutΔt=0.5 day with four seasons campaign length and 1 day *** accuracy is comparable to the up-coming TDCOSMO *** it would be better when the campaign length keeps longer and with high *** a result,the capability of the Muztagh-Ata 1.93 m telescope allows it to join the network of TDSL *** will enrich the database for strongly lensed quasar observations and make more precise measurements of time delays,especially considering the unique coordinate of the site.

关键词： equipped Together precise

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Molecule-based vertical transistor via intermolecular charge transport throughπ-πstacking

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Nano Research 2024年第5期17卷 4573-4581页

作者： Cheng Liu Cheng Fu Lingyu Tang jianghua wu Zhangyan Mu Yamei Sun Yanghang Pan Bailin Tian Kai Bao Jing Ma Qiyuan He Mengning Ding Key Laboratory of Mesoscopic Chemistry School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China Jiangsu Key Laboratory of Advanced Organic Materials School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China National Laboratory of Solid State Microstructures Jiangsu Key Laboratory of Artificial Functional MaterialsCollege of Engineering and Applied SciencesCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China

Theπ-πstacking is a well-recognized intermolecular interaction that is responsible for the construction of electron hopping channels in numerous conducting frameworks/***,the exact role ofπ-to-πchannels within typical single crystalline organic semiconductors remains unclear as the orientations of these molecules are diverse,and their control usually requires additional side chain groups that misrepresent the intrinsic properties of the original semiconducting ***,the construction of conduction channels with intrinsicπ-πstacking in the molecule-based device is crucial for the utilization of their unique transport characteristics and understanding of the transport *** this end,we present a molecular intercalation strategy that integrates two-dimensional layered materials with functional organic semiconductor molecules for functional molecule-based *** organic semiconductor molecules can be effectively intercalated into the van der Waals gaps of semi-metallic TaS_(2) withπ-πstacking configuration and controlled intercalant *** results show that the vertical charge transport in the stacking direction shows a tunneling-dominated mechanism that strongly depends on the molecular ***,we demonstrated a new type of molecule-based vertical transistor in which TaS_(2) andπ-πstacked organic molecules function as the electrical contact and the active channel,***/off ratios as high as 447 are achieved under electrostatic modulation in ionic liquid,comparable to the current state-of-the-art molecular *** study provides an ideal platform for probing intrinsic charge transport acrossπ-πstacked conjugated molecules and also a feasible approach for the construction of high-performance molecule-based electronic devices.

关键词： π-πstacking electrochemical intercalation organic semiconductor electrical transport tunneling field effect transistor

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护生志愿服务参与动机现状及影响因素分析

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卫生职业教育 2025年第1期43卷 99-102页

作者：李红丹高梓涵朱小雨孙悦徐梦亚武江华山东第一医科大学(山东省医学科学院)护理学院山东泰安271000

目的调查护生参与志愿服务动机现状并分析影响因素。方法采用一般资料调查表、大学生志愿者行动参与动机调查问卷、专业认同感量表和学业自我效能量表,对某高校912名护生进行调查,运用SPSS 26.0软件进行数据分析。结果护生大学生志愿者... 详细信息

目的调查护生参与志愿服务动机现状并分析影响因素。方法采用一般资料调查表、大学生志愿者行动参与动机调查问卷、专业认同感量表和学业自我效能量表,对某高校912名护生进行调查,运用SPSS 26.0软件进行数据分析。结果护生大学生志愿者行动参与动机调查问卷得分为(155.12±24.08)分,处于中上水平,政治面貌、年级、是否加入志愿服务组织、学业自我效能感和专业认同感为护生志愿服务动机的影响因素(P<0.05)。结论护生志愿服务参与动机处于中上水平。护理专业教师可通过引导护生增强专业认同感和提升学业自我效能感,使其形成正向态度,进而增强志愿服务参与动机。

关键词：护生志愿服务参与动机

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Step-edge controlled fast growth of wafer-scale MoSe_(2)films by MOCVD

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Nano Research 2023年第7期16卷 9577-9583页

作者： Rui Ji Jing Liao Lintao Li Rongji Wen Mengjie Liu Yifeng Ren jianghua wu Yunrui Song Minru Qi Zhixing Qiao Liwei Liu Chengbing Qin Yu Deng Yongtao Tian Suotang Jia Yufeng Hao Key Laboratory of Material Physics of Ministry of Education School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China National Laboratory of Solid State Microstructures College of Engineering and Applied SciencesJiangsu Key Laboratory of Artificial Functional Materialsand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210023China State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China College of Medical Imaging Shanxi Medical UniversityTaiyuan 030001China MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices School of Integrated Circuits and ElectronicsBeijing Institute of TechnologyBeijing 100081China

Two-dimensional(2D)transition metal dichalcogenides(TMDCs),due to their unique physical properties,have a wide range of applications in the next generation of electronics,optoelectronics,and ***-scale preparation of high-quality TMDCs films is critical to realize these potential *** we report a study on metal-organic chemical vapor deposition(MOCVD)growth of wafer-scale MoSe_(2)films guided by the crystalline step edges of miscut sapphire *** established that the nucleation density and growth rate of MoSe_(2)films were positively correlated with the step-edge density and negatively with the growth *** a certain temperature,the MoSe_(2)domains on the substrate with high step-edge density grow faster than that with low *** a result,wafer-scale and continuous MoSe_(2)films can be formed in a short duration(30 min).The MoSe_(2)films are of high crystalline quality,as confirmed by systematic Raman and photoluminescence(PL)*** results provide an important methodology for the rapid growth of wafer-scale TMDCs,which may promote the application of 2D semiconductors.

关键词： MoSe_(2) nucleation density transition metal dichalcogenides metal-organic chemical vapor deposition(MOCVD) waferscale two-dimensional(2D)semiconductor

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