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Experimental Investigation on Thermal Characteristics of Long Distance Loop Heat Pipes

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Journal of Thermal Science 2022年第3期31卷 741-750页

作者： zhao ya’nan yaN Tao LIANG Jingtao Key Laboratory of Space Energy Conversion Technology Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100190China

Loop heat pipes(LHPs)are attractive two-phase thermal control devices for satellites,electronics and many other applications.They are capable of transporting heat efficiently for long distances up to several meters at any orientation.This paper investigated the heat transfer characteristics of loop heat pipes with long distances and small diameter transport lines.Small stainless steel tubes of 2 mm and 3 mm in inner diameters were chosen as liquid lines and vapor lines of the LHPs.The local thermal resistances in the evaporator of the 6 m-LHP were researched and analyzed,which indicated that the thermal resistance between the aluminum block and the vapor in the vapor channel accounted for a major proportion of the total thermal resistance.The effect of heat sink temperatures on the performance of the 6 m-LHP were compared with 10°C,15°C,20°C and 25°C cooling water temperatures.Moreover,the thermal characteristics of LHPs with transport distances of 2 m and 16 m were also experimentally investigated.The 16 m-LHP could achieve a heat transfer capacity of 100 W and the 2 m-LHP could reach more than 339 W,on the premise of the evaporator temperature below 100°C.The thermal resistance of the 2 m-LHP could achieve 0.125°C/W.

关键词： loop heat pipe thermal management heat transport long distance thermal resistance

Experimental Study on Cooling Down Process of a Nitrogen-Charged Cryogenic Loop Heat Pipe

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Journal of Thermal Science 2023年第1期32卷 153-165页

作者： zhao ya'nan yaN Tao LIANG Jingtao Key Laboratory of Space Energy Conversion Technology Technical Institute of Physics and ChemistryChinese Academyof SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China

Cryogenic loop heat pipes are highly efficient heat transfer devices at cryogenic temperature range,which have promising application prospects in satellites,spacecrafts,electronics,and so on.Cooling down process is a most critical process for a CLHP before startup.At present,secondary loop is a major way for a CLHP to fulfil cooling down and most studies are concentrated on heat transfer characteristics during normal operation.However,few investigations have been carried out on the cooling down process.In this paper,the cooling down process of a nitrogen-charged CLHP assisted with a secondary loop was experimentally investigated.A simple qualitative approach to estimate the cooling down time was proposed according to the law of conservation of energy.The two flow paths of the working fluid in the CLHP during the cooling down process were described.Experimental studies on the cooling down process with various secondary heat loads and working fluid inventory were presented in detail.With the increase of secondary heat load,the elapsed time of Stage III decreased significantly due to the larger mass flow rate in Path I.In addition,the effect of the working fluid inventory on the cooling down time was generally small in the range from 2.99 MPa to 3.80 MPa.However,with 2.80 MPa working fluid inventory,it required much longer cooling down time,which was because of the lack of liquid in the CLHP with low working fluid inventory.Moreover,the influence of gravity on the temperature variation of the components during the experiments was analyzed.This work is beneficial for better understanding of the cooling down process and optimizing of CLHPs.

关键词： cryogenic loop heat pipe secondary loop cooling down heat transfer

Radiolabeled peptide probe for tumor imaging

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Chinese Chemical Letters 2022年第7期33卷 3361-3370页

作者： ya-Qiong yan Hao Wang Yuliang zhao CAS Center for Excellence in Nanoscience CAS Key Laboratory for Biomedical Effects of Nanomaterials and NanosafetyNational Center for Nanoscience and Technology(NCNST)Beijing 100190China

Radionuclide imaging is now the premier imaging method in clinical practice for its high sensitivity and tomographic capability.Current clinically available radio imaging methods mostly use positron-emission tomography(PET)and single-photon emission computed tomography(SPECT)to detect anatomic abnormalities that conventional imaging techniques typically have challenges for visualizing.Contrast agents are indispensable for radionuclide imaging,and the radionuclide is always attached to a suitable vector that achieves targeted delivery.Nowadays,peptides have attracted increasing interest in targeting vectors of contrast agents,mainly due to their high specificity for target receptors at nanomolar concentrations and low toxicity.Radiolabeled peptide probes as kinds of PET/SPECT tracers had become essential tools for clinical radionuclide diagnosis.This review mainly summarizes radiolabeled peptide probes for bioimaging,including fundamental concepts of radiolabeled peptide probe design,some typical peptide analogs radiocontrast agents for PET,SPECT,and the combination imaging.

关键词： Peptide Positron-emission tomography(PET) Single-photon emission computed tomography(SPECT) Bioimaging

Nuclearity and Finite-Representability in the System of Completely Integral Mapping Spaces

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Acta Mathematica Sinica,English Series 2024年第5期40卷 1197-1214页

作者： Zhe DONG Ji Cheng TAO ya Fei zhao Department of Mathematics Zhejiang UniversityHangzhou 310027P.R.China Department of Mathematics China Jiliang UniversityHangzhou 310018P.R.China Department of Mathematics Zhejiang International Studies UniversityHangzhou 310023P.R.China

In this paper,we investigate local properties in the system of completely integral mapping spaces.We introduce notions of injectivity,local reflexivity,exactness,nuclearity,finite-represent ability and WEP in the system of completely integral mapping spaces.First we obtain that any finite-dimensional operator space is injective in the system of completely integral mapping spaces.Furthermore we prove that C is the unique nuclear operator space and the unique exact operator space in this system.We also show that C is the unique operator space which is finitely representable in{T_(n)}n∈Nin this system.As corollaries,Kirchberg’s conjecture and QWEP conjecture in the system of completely integral mapping spaces are false.

关键词： Completely integral mapping space injectivity exactness nuclearity finite-representability WEP

Highly sensitive salinity sensor based on Mach-Zehnder interferometer with double-C fiber

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Fundamental Research 2022年第2期2卷 296-302页

作者： ya-nan Zhang Like Li Jincheng zhao Yong zhao College of Information Science and Engineering Northeastern UniversityShenyang 110819China State Key Laboratory of Synthetical Automation for Process Industries Shenyang 110819China Hebei Key Laboratory of Micro-Nano Precision Optical Sensing and Measurement Technology Qinhuangdao 066004China

This paper proposes a highly sensitive,compact,and low-cost optical fiber salinity sensor based on the Mach-Zehnder interferometer.The sensor is constructed using a single mode fiber(SMF)-no-core fiber-double-C fiber(DCF)-NCF-SMF structure,with the DCF prepared by etching the dual side-hole fiber with HF acid.The DCF’s large-size exposed microfluidic channels solve the previous microstructured optical fiber’s challenging liquid filling and replacement problems.Theoretical simulations and experiments demonstrate that the sensor is suitable for high-sensitivity salinity measurement.The sensor exhibits a high salinity sensitivity of-2.26 nm/‰ in the salinity range of 10‰-50‰,as demonstrated by the experimental results.Additionally,the sensor exhibits some fascinating characteristics,including high repeatability,hysteresis,reversibility,and stability.

关键词： Optical fiber sensor Salinity sensor Mach-Zehnder interferometer Microfluidic channel Double-C fiber

Impact of Antimicrobial Stewardship Programs on Antibiotic Use and Drug Resistance:Analysis of Data from Maternal and Child Health Care Hospitals in Hubei Province,China

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Current Medical Science 2022年第5期42卷 1106-1110页

作者： ya-zheng zhao Ting-ting LI Wei FU Department of Pharmacy Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan430030China

ObjectiveTo evaluate the impact of Antimicrobial Stewardship Programs(ASPs)on antibiotic use and drug resistance.MethodsThis was a retrospective,multicenter,management intervention study.The data from 85 maternity hospitals(maternal and child health care hospitals)in Hubei province from 2012 to 2019 were collected.The indicators related to antimicrobial drug use included the utilization rate of different grades of antimicrobial drugs,the intensity of antimicrobial agent use,the rational use of prophylactic antimicrobial agents before class I surgical incision,and pathogenic detection and consultation rates before antimicrobial drug use.ResultsSince the implementation,the purchase of antimicrobial agents in hospitals has been maintained within the prescribed range,and the defined daily dose system(DDDs)of antimicrobial agents has been reduced,prophylactic use and accurate treatment of antimicrobial agents related to class I surgical incision have been more reasonable.With the implementation of ASPs,the detection rate of imipenem-resistant Acinetobacter baumannii,cefotaxime-resistant Escherichia coli,and methicillin-resistant Staphylococcus aureus has been decreased in China from national bacterial resistance surveillance data.ConclusionASPs have positive effects on antibiotic use and drug resistance in 85 maternity hospitals(maternal and child health care hospitals).

关键词： Antimicrobial Stewardship Program antimicrobial resistance maternal and child health care hospitals

Commutation of Geometry-Grids and Fast Discrete PDE Eigen-Solver GPA

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Chinese Annals of Mathematics,Series B 2023年第5期44卷 735-752页

作者： Jiachang SUN Jianwen CAO ya ZHANG Haitao zhao Laboratory of Parallel Software and Computational Science Institute of SoftwareChinese Academy ofSciencesBeijing 100190China

A geometric intrinsic pre-processing algorithm(GPA for short)for solving largescale discrete mathematical-physical PDE in 2-D and 3-D case has been presented by Sun(in 2022–2023).Different from traditional preconditioning,the authors apply the intrinsic geometric invariance,the Grid matrix G and the discrete PDE mass matrix B,stiff matrix A satisfies commutative operator BG=GB and AG=GA,where G satisfies G^(m)=I,m<

关键词： Mathematical-physical discrete eigenvalue problems Commutative operator Geometric pre-processing algorithm Eigen-polynomial factorization

Model and Algorithm of Sequence-Based Quantum-Inspired Neural Networks

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Chinese Journal of Electronics 2018年第1期27卷 9-18页

作者： LI Panchi zhao ya School of Computer and Information Technology Northeast Petroleum University

To enhance the approximation ability of traditional Artificial neural network(ANN), by introducing the quantum rotation gates and the multi-qubits controlled-NOT gates to ANN, we proposed a Sequence input-based quantum-inspired neural network(SIQNN).In our model, the hidden nodes are composed of some multi-qubits controlled-NOT gates, the inputs are described by the multi-dimensional discrete qubits sequences,the output nodes are the traditional neurons. The model parameters include the rotation angles of quantum rotation gates in hide layer and the weights in output layer.The learning algorithms were derived by employing the Levenberg-Marquardt algorithm. Simulation results of predicting the runoff of the Hongjiadu Reservoir show that,the SIQNN is obviously superior to the ANN.

关键词： Quantum computation Quantum rotation gate Multi-qubits controlled-NOT gate Quantum inspired neuron Quantum-inspired neural network

Pore Engineering for Covalent Organic Framework Membranes

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Chemical Research in Chinese Universities 2022年第2期38卷 364-372页

作者： yaO Jin LU ya SUN Huihui zhao Xin Key Laboratory of Synthetic and Self-assembly Chemistry for Organic Functional Molecules Shanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200032P.R.China School of Chemistry and Materials Science Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou 310024P.R.China College of Chemistry and Materials Science Shanghai Normal UniversityShanghai 200234P.R.China

Membrane technology is of particular significance for the sustainable development of society owing to its potential capacity to tackle the energy shortage and environmental pollution.Membrane materials are the core part of membrane technology.Researchers have always been pursuing predictable structures of advanced membrane materials,which provides a possibility to fully unlock the potential of membranes.Covalent organic frameworks(COFs),with the advantage of controllable pore microenvironment,are considered to be promising candidates to achieve this design concept.The customizable function of COF membranes through pore engineering does well in the enhancement of selective permeability performance,which offers COF membranes with great application potentials in separation and transportation fields.In this context,COF-based membranes have been developed rapidly in recent years.Herein,we present a brief overview on the strategies developed for pore engineering of COF membranes in recent years,including skeleton engineering,pore surface engineering,host-guest chemistry and membrane fabrication.Moreover,the features of transmission or separation of molecules/ions based on COF membranes and corresponding applications are also introduced.In the last part,the challenges and prospects of the development of COF membranes are discussed.

关键词： Membrane technology Covalent organic framework(COF) Pore engineering Separation Ion transportation