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Study on the effect of thermal deformation on the liquid seal of high-temperature molten salt pump in molten salt reactor

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Nuclear Science and Techniques 2023年第2期34卷 128-138页

作者： Xing‑Chao shen yuan Fu Jian‑Yu Zhang Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China

The high-temperature molten salt pump is the core equipment in a molten salt reactor that drives the flow of the molten salt *** stability is key to the continuous and reliable operation of the molten salt pump,and the liquid seal at the wear ring can affect the dynamic characteristics of the rotor *** the molten salt pump is operated in the hightemperature molten salt medium,thermal deformation of the submerged parts inevitably occurs,changing clearance between the stator and rotor,affecting the leakage and dynamic characteristics of the *** this study,the seal leakage,seal dynamic characteristics,and rotor system dynamic characteristics are simulated and analyzed using finite element simulation software based on two cases of considering the effect of seal thermal deformation effect or *** results show a significant difference in the leakage characteristics and dynamic characteristics of the seal obtained by considering the effect of seal thermal deformation and neglecting the effect of thermal *** leakage flow rate decreases,and the first-order critical speed of the seal-bearing-rotor system decrease after considering the seal’s thermal deformation.

关键词： High-temperature molten salt pump Seal thermal deformation Leakage characteristics Seal dynamic characteristics Critical speed

Online identification of time-varying dynamical systems for industrial robots based on sparse Bayesian learning

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Science China(Technological Sciences) 2022年第2期65卷 386-395页

作者： shen Tan DONG YunLong HE DingXin yuan Ye School of Artificial Intelligence and Automation Huazhong University of Science and TechnologyWuhan 430074China

Nowadays, industrial robots have been widely used in manufacturing, healthcare, packaging, and more. Choosing robots in these applications mainly attributes to their repeatability and precision. However, prolonged and loaded operations can deteriorate the accuracy and efficiency of industrial robots due to the unavoidable accumulated kinematical and dynamical errors. This paper resolves these aforementioned issues by proposing an online time-varying sparse Bayesian learning(SBL) method to identify dynamical systems of robots in real-time. The identification of dynamical systems for industrial robots is cast as a sparse linear regression problem. By constructing the dictionary matrix, the parameters of the robot dynamics are effectively estimated via a re-weighted1-minimization algorithm. Online recursive methods are integrated into SBL to achieve real-time system identification. By including sparsity and promoting online learning, the proposed method can handle time-varying dynamical systems and therefore improve operational stability and accuracy. Experimental results on both simulated and real selective compliance assembly robot arm(SCARA) robots have demonstrated the effectiveness of the proposed method for industrial robots.

关键词： industrial robots sparse Bayesian learning online identification

A Review on Recent Development of Cooling Technologies for Photovoltaic Modules

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Journal of Thermal Science 2020年第6期29卷 1410-1430页

作者： ZHANG Chunxiao shen Chao WEI shen WANG yuan LV Guoquan SUN Cheng Key Laboratory of Cold Region Urban and Rural Human Settlement Environment Science and Technology Ministry of Industry and Information TechnologySchool of ArchitectureHarbin Institute of TechnologyHarbin 150090China The Bartlett School of Construction and Project Management University College London(UCL)London WC1E 7HBUK

When converting solar energy to electricity,a big proportion of energy is not converted for electricity but for heating PV cells,resulting in increased cell temperature and reduced electrical *** cooling technologies have been developed and used for PV modules to lower cell temperature and boost electric energy ***,little crucial review work was proposed to comment cooling technologies for PV ***,this paper has provided a thorough review of the up-to-date development of existing cooling technologies for PV modules,and given appropriate comments,comparisons and *** to the ways or principles of cooling,existing cooling technologies have been classified as fluid medium cooling(air cooling,water cooling and nanofluids cooling),optimizing structural configuration cooling and phase change materials *** influential factors and sub-methods were collected from the review work,and their contributions and impact have been discussed to guide future *** most cooling technologies reviewed in this paper are matured,there are still problems need to be solved,such as the choice of cooling fluid and its usability for specific regions,the fouling accumulation and cleaning of enhanced heat exchangers with complex structures,the balance between cooling cost and net efficiency of PV modules,the cooling of circulating water in tropical areas and the freezing of circulating water in cold *** be advocated,due to efficient heat transfer and spectral filter characters,nanofluids can promote the effective matching of solar energy at both spectral and spatial scales to achieve orderly energy utilization.

关键词： solar energy PV modules cooling technologies nanoparticles phase change materials

A Self-Adaptive Programming Mechanism for Reconfigurable Parsing and Processing

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China Communications 2016年第S1期13卷 87-97页

作者： DUAN tong shen Juan WANG Peng LIU Shiran National Digital Switching System Engineering & Technological Research Center

In this paper, we present a self-adaptive programming mechanism(SAP) that targets programming hardware devices of reconfigurable parsing and processing. The SAP programming system locates in software of network data plane and has three features:(1) programmable packet parsing: the packet header format can be customized and new header type can be added;(2) reconfigurable packet processing: the match fields to be handled in each match table can be specified;(3) function-adaptive control: any function control systems can determine the packet processing flow independently without the need of knowing the specifics of the underlying hardware. Finally, we implement a prototype on NetF PGA-10 G together with two representative function control systems(router and Open Flow switch) to demonstrate how SAP works. We believe the data plane of reconfigurable parsing and processing will lead to future switches that provide greater flexibility, and unlock the potential of network function innovation.

关键词： programming mechanism selfadaptive reconfigurable network data plane Net FPGA

Improved nonlinear invariant attack

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Science China(Information Sciences) 2022年第3期65卷 266-268页

作者： Haipeng tong Xuan shen Chao LI Yunwen LIU College of Liberal and Sciences National University of Defense Technology College of Information and Communication National University of Defense Technology

Dear editor,In Asiacrypt 2016, Todo et al. [1] proposed a nonlinear invariant attack, a new type of distinguisher that covers any number of rounds for a substitution-permutation network（SPN） cipher under weak keys. The main idea of the nonlinear invariant attack is to find a Boolean function g : F;→ F2 such that the evaluation of g（x） ⊕ g(E;（x）) is constant for any x, where Ek（x） is a block cipher. The function g is called the nonlinear invariant of Ekand the keys k that satisfy the condition are called weak keys.

关键词： Nonlinear Invariant Attack 4-bit optimal S-boxes Q-equivalence FIDES Distinguishing Attack

An ultrathin and robust single-ion conducting interfacial layer for dendrite-free lithium metal batteries

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Journal of Energy Chemistry 2024年第11期98卷 414-421页

作者： Ting-Ting Lv Jia Liu Li-Jie He Hong yuan tong-Qi yuan Beijing Key Laboratory of Lignocellulosic Chemistry Beijing Forestry UniversityBeijing 100083China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China

The practical application of rechargeable lithium metal batteries(LMBs) encounters significant challenges due to the notorious dendrite growth triggered by uneven Li deposition behaviors. In this work,a mechanically robust and single-ion-conducting interfacial layer, fulfilled by the strategic integration of flexible cellulose acetate(CA) matrix with rigid graphene oxide(GO) and Li F fillers(termed the CGL layer), is rationally devised to serve as a stabilizer for dendrite-free lithium(Li) metal batteries. The GCL film exhibits favorable mechanical properties with high modulus and flexibility that help to relieve interface fluctuations. More crucially, the electron-donating carbonyl groups(C=O) enriched in GCL foster a strengthened correlation with Li^(+), which availably aids the Li^(+)desolvation process and expedites facile Li^(+)mobility, yielding exceptional Li^(+) transference number of 0.87. Such single-ion conductive properties regulate rapid and uniform interfacial transport kinetics, mitigating the growth of Li dendrites and the decomposition of electrolytes. Consequently, stable Li anode with prolonged cycle stabilities and flat deposition morphologies are realized. The Li||LiFePO_(4) full cells with CGL protective layer render an outstanding cycling capability of 500 cycles at 3 C, and an ultrahigh capacity retention of 99.99% for over 220 cycles even under harsh conditions. This work affords valuable insights into the interfacial regulation for achieving high-performance LMBs.

关键词： Single-ion conductive Interfacial layer Cellulose acetate Dendrite-free morphologies Lithium metal batteries

Increased Preoperative Glucose Variability Is Associated with Adverse Perioperative Outcomes Following Orthopedic Surgery in Patients with Type 2 Diabetes Mellitus

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Current Medical Science 2020年第3期40卷 523-529页

作者： Si-jie yuan Jie shen Department of Endocrinology and Metabolic Diseases The Third Affiliated HospitalSouthern Medical UniversityGuangzhou510630China

The association between glucose variability(GV)and adverse perioperative outcomes in type 2 diabetes mellitus(T2DM)patients undergoing orthopedic surgery was investigated.A retrospective cohort study was performed by analyzing data on T2DM patients receiving continuous blood glucose(BG)monitoring and continuous subcutaneous insulin infusion treatment due to poorly controlled preoperative BG prior to orthopedic *** was assessed with coefficient of variation(CV).Postoperative and perioperative CV,hypoglycemia cases,and other perioperative outcomes(diabetes preparation time[DPT],length of stay[LOS],and perioperative and infective complication cases)were *** showed that a total of 168 patients were grouped into preoperative CV tertiles:1st(n=56):0–0.2921,2nd(n=58):0.2922–0.3779,and 3rd(n=54):0.3780–*** blood glucose(FBG),perioperative CV,rate of hypoglycemia cases(OR:5.53,95%CI:2.43–12.59)(all P<0.001)and DPT(P=0.024)were higher in the 3rd than in the 1st *** adjustments of covariates,regression analysis indicated that the 3rd tertile was associated with increased perioperative CV(adjusted coefficient=0.515,P<0.001),DPT(adjusted coefficient=0.169,P=0.073),rate of hypoglycemia cases(OR:6.72,95%CI:2.69−16.82,P<0.001)and perioperative complication cases(OR:2.50,95%CI:0.90−7.01,P=0.080).In conclusion,preoperative GV is associated with increased perioperative GV and adverse perioperative outcomes including longer DPT and higher rates of hypoglycemia and perioperative complications.

关键词： glycemic variability orthopedics perioperative period type 2 diabetes mellitus

Prospects for the transformation and development of carbon storage in abandoned mines of coal enterprises from the perspective ofcarbon neutrality

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International Journal of Coal Science & Technology 2023年第3期10卷 24-40页

作者： Xin Lyu tong Zhang Liang yuan Juejing Fang State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science and TechnologyHuainan 232001China Institute of Energy Hefei Comprehensive National Science CenterHefei230031China

Under the carbon neutrality goal,coal enterprises must seek breakthroughs from abandoned mines,develop new resources in the new era,turn problems into countermeasures,and participate in the carbon emissions market,for contributing to the accomplishment of the national strategic goal of carbon *** this end,we investigated the relevant national policies and regulations to clarify the boundaries disclosed by the carbon information of enterprises,understood the development direction of carbon storage in abandoned mines,and clarified the transformation and development of carbon storage in aban-doned *** made a few suggestions:(1)China should learn from its past experience and other countries to develop the energy industry with Chinese characteristics and reform the economic system.(2)Coal enterprises must actively respond to the national carbon information disclosure policy,clarify their own responsibilities and carbon emission boundaries.(3)It is necessary to proactively obtain advanced knowledge and plan carbon storage pathways for abandoned mines.(4)Devel-opment problems of coal enterprises should be deduced using ***'dual carbon'goals should be achieved steadily step-by-step.(5)Three measures,*** the existing resource structure,coordinating the information of abandoned mines,and promoting the cultivation of scientific and technological talents.

关键词： Mining engineering Abandoned mines Carbon neutrality Carbon emission rights Carbon tax

CTRR-ncRNA:A Knowledgebase for Cancer Therapy Resistance and Recurrence Associated Non-coding RNAs

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Genomics, Proteomics & Bioinformatics 2023年第2期21卷 292-299页

作者： tong Tang Xingyun Liu Rongrong Wu Li shen Shumin Ren Bairong shen Institutes for Systems Genetics Frontiers Science Centre for Disease-related Molecular NetworkWest China HospitalSichuan UniversityChengdu 610041China West China School of Medicine Sichuan UniversityChengdu 610041China

Cancer therapy resistance and recurrence(CTRR)are the dominant causes of death in cancer *** studies have indicated that non-coding RNAs(ncRNAs)can not only reverse the resistance to cancer therapy but also are crucial biomarkers for the evaluation and prediction of ***,we developed CTRR-ncRNA,a knowledgebase of CTRR-associated ncRNAs,aiming to provide an accurate and comprehensive resource for research involving the association between CTRR and *** to most of the existing cancer databases,CTRRncRNA is focused on the clinical characterization of cancers,including cancer subtypes,as well as survival outcomes and responses to personalized therapy of cancer *** pertaining to biomarker ncRNAs has also been documented for the development of personalized CTRR prediction.A user-friendly interface and several functional modules have been incorporated into the *** on the preliminary analysis of genotype-phenotype relationships,universal ncRNAs have been found to be potential biomarkers for *** CTRR-ncRNA is a translation-oriented knowledgebase and it provides a valuable resource for mechanistic investigations and explainable artificial intelligence-based modeling.

关键词： Translational bioinformatics Therapeutic resistance Cancer recurrence Non-coding RNA Knowledgebase