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世界地震工程 2004年第2期20卷 1-5页

作者：刘天适赵强王兴国苏幼坡苏经宇河北理工学院河北省地震工程研究中心河北唐山063009 中国建筑科学研究院工程抗震研究所北京100013

对碟形弹簧竖向减震体系利用时程分析方法对其进行动力分析,并输入不同场地、不同频谱的地震波考察其减震效果,验证了碟形弹簧在合理控制其刚度的前提下可以起到有效减小竖向地震的作用。

关键词：喋形弹簧竖向隔震最大加速度反应水平地震工程结构

Optimized coagulation pretreatment alleviates ultrafiltration membrane fouling: The role of floc properties and slow-mixing speed on mechanisms of chitosan-assisted coagulation

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Journal of Environmental Sciences 2019年第8期31卷 82-92页

作者： Peng Du xing Li Yanling Yang Zhaoyang su Hang Li Nan Wang Tingting guo Tingting Zhang Zhiwei Zhou College of Architecture and Civil engineering Beijing University of Technology

To alleviate ultrafiltration(UF) membrane fouling, the pre-coagulation of poly-aluminum chloride(PACl) with the aid of chitosan(CTS) was conducted for synthetic humic acid–kaolin water treatment. Pre-coagulation of three molecular weights(MW) CTSs(50–190 kDa(CTSL), 190–310 kDa(CTSM) and 310–375 kDa(CTSH)) was optimized with slow-mixing speeds of 30, 60 and 90 r/min, respectively. The removal efficiency and floc properties as well as membrane fouling were analyzed, and were compared to results obtained by conventional coagulation with PACl. Results showed that variations in floc properties could be ascribed to the coagulation mechanisms of CTS_L/CTS_M/CTS_H at different slow-mixing speeds, resulting in reduced UF membrane fouling. Specifically, at the low speed of 30 r/min, all three CTS types produced flocs with similar properties, while CTSLresulted in the lowest removal efficiency and aggravated irreversible fouling. At the appropriate speed of 60 r/min, CTSMgenerated the most compact flocs with the combined effects of bridging and path mechanisms. The compact cake layer formed could alleviate irreversible fouling,which was beneficial for prolonging the operation of the UF membrane. At the high speed of90 r/min, CTSHformed fragile flocs and aggravated irreversible membrane fouling. We considered membrane fouling to be affected by floc properties and the resultant removal efficiency, which was governed by the MW of the CTS used and the slow-mixing speed applied as well.

关键词： Coagulation–ultrafiltration Membrane fouling Floc properties Chitosan Slow-mixing speed

Optimal timing of biliary drainage based on the severity of acute cholangitis:A single-center retrospective cohort study

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World Journal of Gastroenterology 2022年第29期28卷 3934-3945页

作者： Zhao-Qing Lu Han-Yu Zhang Chen-Fen su Yue-Yan xing guo-xing Wang Chun-Sheng Li Department of Emergency Medicine Beijing Friendship HospitalCapital Medical UniversityBeijing 100050China Emergency and Critical Care Center Beijing Friendship HospitalCapital Medical UniversityBeijing 100050China

BACKGROUND Biliary decompression is well known to greatly decrease the risks of mortality in acute cholangitis(AC).Although early biliary drainage is recommended by the treatment guidelines for AC,the best time for performing this procedure is yet to be ***,since the clinical outcomes of patients with severe AC vary dramatically,screening for patients that could benefit the most from early drainage would be more beneficial than the drainage performed based on the severity grade *** To investigate the optimal drainage timing for AC patients with each disease severity grade and organ *** In this retrospective monocenter cohort analysis,we reviewed 1305 patients who were diagnosed with AC according to the Tokyo guidelines 2018 at a Chinese tertiary hospital between July 2016 and December *** characteristics including age and sex,clinical and laboratory characteristics,and imaging findings of each patient were obtained from electronic medical *** investigated the all-cause in-hospital mortality(IHM),hospital length of stay(LOS),and hospitalization costs associated with the timing of biliary drainage according to the severity grading and different dysfunctioning organs and predictors[age,white blood cell(WBC)count,total bilirubin,albumin,lactate,malignant obstruction,and Charlton comorbidity index(CCI)].REsuLTS Biliary drainage within 24 or 48 h in Grade Ⅲ AC patients could dramatically decrease IHM(3.9%vs 9.0%,P=0.041;4%vs 9.9%,P=0.018,respectively),while increasing LOS and hospitalization *** logistic analysis revealed that neurological,respiratory,renal,and cardiovascular dysfunctions,hypoalbuminemia,and malignant obstruction were significantly associated with IHM(odds ratio=5.32,2.541,6.356,4.021,5.655,and 7.522;P<0.001,P=0.016,P<0.001,P=0.012,P<0.001,and P<0.001;respectively).Biliary decompression performed within 12 h of admission significantly decreased the IHM in AC patients with neur

关键词： Acute cholangitis Endoscopic retrograde cholangiopancreatography Mortality Biliary drainage Organ dysfunction

Numerical simulation of microwave-induced cracking and melting of granite based on mineral microscopic models

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International Journal of Minerals,Metallurgy and Materials 2024年第7期31卷 1512-1524页

作者： Xiaoli su Diyuan Li Junjie Zhao Mimi Wang xing su Aohui Zhou School of Resources and Safety Engineering Central South UniversityChangsha 410083China

This study introduces a coupled electromagnetic–thermal–mechanical model to reveal the mechanisms of microcracking and mineral melting of polymineralic rocks under microwave *** tests validate the rationality of the proposed *** microscopic mineral sections into the granite model for simulation shows that uneven temperature gradients create distinct molten,porous,and nonmolten zones on the fracture ***,the varying thermal expansion coefficients and Young's moduli among the minerals induce significant thermal stress at the mineral *** and biotite with higher thermal expansion coefficients are subjected to compression,whereas plagioclase with smaller coefficients experiences tensile *** the molten zone,quartz undergoes transgranular cracking due to theα–βphase *** local high temperatures also induce melting phase transitions in biotite and *** numerical study provides new insights into the distribution of thermal stress and mineral phase changes in rocks under microwave irradiation.

关键词： microwave numerical modeling microcracking phase change granite

Dynamic characteristics of multi-span spinning beams with elastic constraints under an axial compressive force

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Applied Mathematics and Mechanics(English Edition) 2024年第2期45卷 295-310页

作者： Xiaodong guo Zhu su Lifeng WANG State Key Laboratory of Mechanics and Control for Aerospace Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China

A theoretical model for the multi-span spinning beams with elastic constraints under an axial compressive force is *** displacement and bending angle functions are represented through an improved Fourier series,which ensures the continuity of the derivative at the boundary and enhances the *** exact characteristic equations of the multi-span spinning beams with elastic constraints under an axial compressive force are derived by the Lagrange *** efficiency and accuracy of the present method are validated in comparison with the finite element method(FEM)and other *** effects of the boundary spring stiffness,the number of spans,the spinning velocity,and the axial compressive force on the dynamic characteristics of the multi-span spinning beams are *** results show that the present method can freely simulate any boundary constraints without modifying the solution *** elastic range of linear springs is larger than that of torsion springs,and it is not affected by the number of *** an increase in the axial compressive force,the attenuation rate of the natural frequency of a spinning beam with a large number of spans becomes larger,while the attenuation rate with an elastic boundary is lower than that under a classic simply supported boundary.

关键词： multi-span spinning beam elastic constraint improved Fourier series free vibration semi-analytical solution

Rational Design of Electrode–Electrolyte Interphase and Electrolytes for Rechargeable Proton Batteries

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Nano-Micro Letters 2023年第7期15卷 90-109页

作者： Zhen su Haocheng guo Chuan Zhao School of Chemistry Faculty of ScienceThe University of New South Wales SydneySydneyNSW 2052Australia

Rechargeable proton batteries have been regarded as a promising technology for next-generation energy storage devices,due to the smallest size,lightest weight,ultrafast diffusion kinetics and negligible cost of proton as charge ***,a proton battery possessing both high energy and power density is yet *** addition,poor cycling stability is another major challenge making the lifespan of proton batteries *** issues have motivated extensive research into electrode ***,the design of electrode–electrolyte interphase and electrolytes is underdeveloped for solving the *** this review,we summarize the development of interphase and electrolytes for proton batteries and elaborate on their importance in enhancing the energy density,power density and battery *** fundamental understanding of interphase is reviewed with respect to the desolvation process,interfacial reaction kinetics,solvent-electrode interactions,and analysis *** categorize the currently used electrolytes according to their physicochemical properties and analyze their electrochemical potential window,solvent(e.g.,water)activities,ionic conductivity,thermal stability,and ***,we offer our views on the challenges and opportunities toward the future research for both interphase and electrolytes for achieving high-performance proton batteries for energy storage.

关键词： Energy storage Proton batteries Aqueous batteries Interfacial chemistry Electrolytes

Refractory lipoatrophy treated with autologous whole blood injection:A case report

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World Journal of Clinical Cases 2025年第2期13卷 33-38页

作者： Wonnam Kim Jun su Park En Hyung Kim Department of Pharmacology School of Korean MedicinePusan National UniversityYangsan 50612GyeongnamSouth Korea Department of Dermatology College of MedicineChungbuk National UniversityCheongju 28644ChungbukSouth Korea Department of Dermatology Chungbuk National University HospitalCheongju 28644ChungbukSouth Korea

BACKGROUND Intramuscular corticosteroid injection may cause adverse effects such as dermal and/or subcutaneous atrophy,alopecia,hypopigmentation,and *** cutaneous atrophy can spontaneously resolve,several treatment options have been suggested for this *** suMMARY In this paper,we report a case of corticosteroid injection induced lipoatrophy treated with autologous whole blood(AWB)injection,as the condition had been unresponsive to fractional laser therapy.A 29-year-old female patient visited the dermatology clinic complaining of skin depression on her right buttock area,which had appeared six months *** had been only subtle improvement at the margins after fractional CO_(2) laser treatment;therefore,after obtaining informed consent from the patient,AWB treatment was *** month after the first AWB injection,the size and depth of the lesion had noticeably improved,and a slight improvement was also observed in *** Close observation is the initial treatment of choice for steroid induced skin atrophy;however,for patients in need of immediate cosmetic improvement,AWB injection may be a safe and cost-effective alternative.

关键词： Atrophy Corticosteroid subcutaneous fat Autologous whole blood injection Laser therapy Case report

The effects of caudal fin deformation on the hydrodynamics of thunniform swimming under self-propulsion

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Journal of Hydrodynamics 2020年第6期32卷 1122-1137页

作者： Yi-kun Feng Yu-min su Huan-xing Liu Yuan-yuan su College of Shipbuilding Engineering Harbin Engineering UniversityHarbin150001China Beijing Institute of Specialized Machinery Beijing100081China Science College Harbin Engineering UniversityHarbin150001China

To investigate the effects of the caudal fin deformation on the hydrodynamic performance of the self-propelled thunniform swimming,we perform fluid-body interaction simulations for a tuna-like swimmer with thunniform *** 3-D vortices are visualized to reveal the role of the leading-edge vortex(LEV)in the thrust *** comparing the swimming velocity of the swimmer with different caudal fin flexure amplitudes fa,it is shown that the acceleration in the starting stage of the swimmer increases with the increase of fa,but its cruising velocity *** results indicate that the caudal fin deformation is beneficial to the fast start but not to the fast cruising of the *** the entire swimming process,the undulation amplitudes of the lateral velocity and the yawing angular velocity decrease as fa *** is found that the formation of an attached LEV on the caudal fin is responsible for generating the low-pressure region on the surface of the caudal fin,which contributes to the ***,the caudal fin deformation can delay the LEV shedding from the caudal fin,extending the duration of the low pressure on the caudal fin,which will cause the caudal fin to generate a drag-type force over a time period in one swimming cycle and reduce the cruising speed of the swimmer.

关键词： Computational fluid dynamics(CFD)numerical simulation self-propulsion caudal fin deformation

Activity Recognition with Smartphone Sensors

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Tsinghua Science and Technology 2014年第3期19卷 235-249页

作者： xing su Hanghang Tong Ping Ji Computer Science Department Graduate Center the City University of New York Computer Science Department City CollegeCUNY

The ubiquity of smartphones together with their ever-growing computing,networking,and sensing powers have been changing the landscape of people＇s daily *** others,activity recoginition,which takes the raw sensor reading as inputs and predicts a user＇s motion activity,has become an active research area in recent *** is the core building block in many high-impact applications,ranging from health and fitness monitoring,personal biometric signature,urban computing,assistive technology,and elder-care,to indoor localization and navigation,*** paper presents a comprehensive survey of the recent advances in activity recognition with smartphones＇ *** start with the basic concepts such as sensors,activity types,*** review the core data mining techniques behind the main stream activity recognition algorithms,analyze their major challenges,and introduce a variety of real applications enabled by activity recognition.

关键词： activity recognition mobile sensors machine learning data mining pattern recognition

Editorial Special Issue on AI-enabled System Simulation and Modelling

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Journal of Systems Science and Systems Engineering 2021年第4期30卷 383-385页

作者： xing su Weihua Li Quan Bai Faculty of Information Technology Beijing University of TechnologyBeijingChina Faculty of Design and Creative Technologies Auckland University of TechnologyAucklandNew Zealand School of ICT University of TasmaniaHobartAustralia

Al-enabled system simulation and modelling has become useful tools to facilitate humans to understand systems in different do-mains,such as physics,astrophysics,chemistry,biology,economics,engineering and social science.A complex system is featured with a large number of interacting components(agents,processes,etc.),whose aggregate activities are nonlinear and *** systems are hard to be simulated or mod-elled by using traditional computational approaches due to complex relationships among system components,distributed features of resources,and dynamics of ***,agent and multi-agent systems have demonstrated advantages and great potentials in modelling and simulating complex systems.

关键词： agent system Simulation