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Corneal endothelial cells and acoustic cavitation in phacoemulsification

World Journal of Clinical Cases 2023年第8期11卷 1712-1718页

作者： Kai Chen Wen-ya Xu Si-Si sun Hong-Wei zhou Department of Ophthalmology Lianshui County People's HospitalHuai’an 223400Jiangsu ProvinceChina Department of Ophthalmology Huai’an 82 HospitalHuai'an 223001Jiangsu ProvinceChina Department of Industrial Engineering Tsinghua UniversityBeijing 100084China

Postoperative complications of phacoemulsification,such as corneal edema caused by human corneal endothelial cell(CEC)injury,are still a matter of *** several factors are known to cause CEC damage,the influence of ultrasound on the formation of free radicals during surgery should be *** in aqueous humor induces cavitation and promotes the formation of hydroxyl radicals or reactive oxygen species(ROS).ROS-induced apoptosis and autophagy in phacoemulsification have been suggested to significantly promote CEC *** cannot regenerate after injury,and measures must be taken to prevent the loss of CEC after phacoemulsification or other CEC *** can reduce the oxidative stress injury of CEC during *** from rabbit eye studies shows that ascorbic acid infusion during operation or local application of ascorbic acid during phacoemulsification has a protective effect by scavenging free radicals or reducing oxidative *** in experiments and clinical practice,hydrogen dissolved in the irrigating solution can also prevent CEC damage during phacoemulsification ***(AST)can inhibit oxidative damage,thereby protecting different cells from most pathological conditions,such as myocardial cells,luteinized granulosa cells of the ovary,umbilical vascular endothelial cells,and human retina pigment epithelium cell line(ARPE-19).However,existing research has not focused on the application of AST to prevent oxidative stress during phacoemulsification,and the related mechanisms need to be *** Rho related helical coil kinase inhibitor Y-27632 can inhibit CEC apoptosis after *** experiments are required to confirm whether its effect is realized through improving the ROS clearance ability of CEC.

关键词： Cataract Phacoemulsification Corneal endothelial cells Ultrasound Acoustic cavitation Oxidative stress Antioxidant

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Boosting the water gas shift reaction on Pt/CeO_(2)-based nanocatalysts by compositional modification: Support doping versus bimetallic alloying

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Journal of Energy Chemistry 2022年第4期31卷 241-249页

作者： Kun Yuan Xiao-Chen sun Hai-Jing Yin Liang zhou Hai-Chao Liu Chun-Hua yan ya-Wen Zhang Beijing National Laboratory for Molecular Sciences(BNLMS) State Key Laboratory of Rare Earth Materials Chemistry and ApplicationsPKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic ChemistryCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Beijing National Laboratory for Molecular Sciences(BNLMS) State Key Laboratory for Structural Chemistry of Stable and Unstable SpeciesCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

The water gas shift reaction is of vital significance for the generation and transition of energy due to the application in hydrogen production and industries such as ammonia synthesis and fuel *** influence of support doping and bimetallic alloying on the catalytic performance of Pt/Ce O_(2)-based nanocatalysts in water gas shift reaction was reported in this *** lanthanide ions and 3d transition metals were respectively introduced into the Ce O_(2)support or Pt to form Pt/Ce O_(2):Ln(Ln=La,Nd,Gd,Tb,Yb)and Pt M/Ce O_(2)(M=Fe,Co,Ni)*** sample of Pt/Ce O_(2):Tb showed the highest activity(TOF at 200℃=0.051 s^(-1))among the Pt/Ce O_(2):Ln and the undoped Pt/Ce O_(2)***,the sample of Pt Fe/Ce O_(2)exhibited the highest activity(TOF at 200℃=0.12 s^(-1))among Pt M/Ce O_(2)*** results of the multiple characterizations indicated that the catalytic activity of Pt/Ce O_(2):Ln catalysts was closely correlated with the amount of oxygen vacancies in doped ceria ***,the different activity of Pt M/Ce O_(2)bimetallic catalysts was owing to the various Pt oxidation states of the bimetals dispersed on *** study of the reaction pathway indicated that both the samples of Pt/Ce O_(2)and Pt/Ce O_(2):Tb catalyzed the reaction through the formate pathway,and the enhanced activity of the latter derived from the increased concentration of oxygen vacancies along with promoted water *** for the sample of Pt Fe/Ce O_(2),its catalytic mechanism was the carboxyl route with a higher reaction rate due to the moderate valence of Pt along with improved CO activation.

关键词： Pt/CeO_(2)catalysts Water–gas shift reaction Support doping Bimetallic alloying

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Stochastic P-bifurcations of a noisy nonlinear system with fractional derivative element

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Acta Mechanica Sinica 2021年第3期37卷 507-515,I0004页

作者： ya-Hui sun Yong-Ge yang Wei Xu School of Applied Mathematics Guangdong University of TechnologyGuangzhou 510520China Department of Applied Mathematics Northwestern Polytechnical UniversityXi'an 710072China

This paper investigates the stochastic P-bifurcation(SPB)of a fractionally damped oscillator subjected to additive and multiplicative Gaussian white *** transformation and the stochastic averaging technique are applied to derive the expression of probability density function(PDF)of the system *** conditions of the stochastic bifurcation induced by system parameters are presented based on the change in the number of extreme points of the probability density *** results are given to show the effectiveness of the proposed *** P-bifurcations for additive and multiplicative noise are studied in detail according to the critical conditions.

关键词： Stochastic P-bifurcation Fractional derivative Stochastic averaging method Gaussian white noise

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Regional Multi-Agent Cooperative Reinforcement Learning for City-Level Traffic Grid Signal Control

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IEEE/CAA Journal of Automatica Sinica 2024年第9期11卷 1987-1998页

作者： Yisha Li ya Zhang Xinde Li Changyin sun School of Automation Southeast UniversityNanjing 210096 Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of EducationSoutheast UniversityNanjing 210096China

This article studies the effective traffic signal control problem of multiple intersections in a city-level traffic system.A novel regional multi-agent cooperative reinforcement learning algorithm called RegionSTLight is proposed to improve the traffic *** a regional multi-agent Q-learning framework is proposed,which can equivalently decompose the global Q value of the traffic system into the local values of several regions Based on the framework and the idea of human-machine cooperation,a dynamic zoning method is designed to divide the traffic network into several strong-coupled regions according to realtime traffic flow *** order to achieve better cooperation inside each region,a lightweight spatio-temporal fusion feature extraction network is *** experiments in synthetic real-world and city-level scenarios show that the proposed RegionS TLight converges more quickly,is more stable,and obtains better asymptotic performance compared to state-of-theart models.

关键词： Human-machine cooperation mixed domain attention mechanism multi-agent reinforcement learning spatio-temporal feature traffic signal control

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Meigs syndrome with pleural effusion as initial manifestation:A case report

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World Journal of Clinical Cases 2021年第21期9卷 5972-5979页

作者： ya-ya Hou Li Peng Mei zhou Department of Obstetrics and Gynaecology Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430000Hubei ProvinceChina Department of Pathology Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430000Hubei ProvinceChina Department of Respiratory Medicine Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022Hubei ProvinceChina

BACKGROUND Meigs syndrome is a rare neoplastic disease characterized by the triad of benign solid ovarian tumor,ascites,and pleural *** postmenopausal women with pleural effusions,ascites,elevated CA-125 level,and pelvic masses,the probability of disseminated disease is ***,the final diagnosis is based on its histopathologic features following surgical removal of a mass *** we describe a case of Meigs syndrome with pleural effusion as the initial *** SUMMARY A 52-year-old woman presented with a 2-mo history of dry cough and oppression in the chest and was admitted to our hospital due to recurrent pleural effusion and gradual worsening of dyspnea that had occurred over the previous *** months before admission,the patient underwent repeated chest drainage and empirical anti-tuberculosis ***,the pleural fluid accumulation persisted,and the patient began to experience dyspnea on exertion leading to admission.A computed tomography scan of the chest,abdominal ultrasound,and magnetic resonance imaging confirmed the presence of right-sided pleural effusion and ascites with a right ovarian *** tumor markers showed raised *** a suspicion of a malignant tumor,the patient underwent laparoscopic excision of the ovarian mass and the final pathology was consistent with an ovarian *** the seventh day postoperation,the patient had resolution of the right-sided pleural *** Despite the relatively high risk of malignancy when an ovarian mass associated with hydrothorax is found in a patient with elevated serum levels of CA-125,clinicians should be aware about rare benign syndromes,like Meigs,for which surgery remains the preferred treatment.

关键词： Meigs syndrome Pleural effusion CA-125 Ovarian thecoma Case report

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Synthesis and evaluation of cationic flocculant P(DAC-PAPTAC-AM) for flocculation of coal chemical wastewater

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Journal of Environmental Sciences 2021年第1期33卷 239-248页

作者： Wenquan sun Shengbao zhou Yongjun sun yanhua Xu College of Urban Construction Nanjing Tech UniversityNanjing 211800China School of Environmental Sciences and Engineering Nanjing Tech UniversityNanjing 211816China

In this study,a high-efficiency cationic flocculant,P(DAC-MAPTAC-AM),was successfully prepared using UV-induced polymerization *** monomer Acrylamide(AM):Acryloxyethyl Trimethyl ammonium chloride(DAC):methacrylamido propyl trimethyl ammonium chloride(MAPTAC)ratio,monomer concentration,photoinitiator concentration,urea content,and cationic monomer DAC:MAPTAC ratio,light time,and power of highpressure mercury lamp were *** characteristic groups,characteristic diffraction peaks,and characteristic proton peaks of P(DAC-MAPTAC-AM)were confirmed by fourier transform infrared spectroscopy(FTIR),X-Ray diffraction(XRD),1H nuclear magnetic resonance spectrometer(1H NMR),and scanning electron microscopy(SEM).The effects of dosage,pH value,and velocity gradient(G)value on the removal efficiencies of turbidity,COD,ammonia nitrogen,and total phenol by poly aluminum ferric chloride(PAFC),P(DACMAPTAC-AM),and PAFC/P(DAC-MAPTAC-AM)in the flocculation treatment of coal chemical wastewater were *** showed that the optimal conditions for the flocculation of coal chemical wastewater using P(DAC-MAPTAC-AM)alone are as follows:dosage of 8-12 mg/L,G value of 100-250 s^-1,and pH value of *** optimal dosage of PAFC is 90-150 mg/L with a pH of *** optimal dosage for PAFC/P(DAC-MAPTAC-AM)is as follows:PAFC dosage of 90-150 mg/L,P(DAC-MAPTAC-AM)dosage of 8-12 mg/L,and pH range of *** P(DAC-MAPTAC-AM)was used alone,the optimal removal efficiencies of turbidity,COD,ammonia nitrogen,and total phenol were 81.0%,35.0%,75.0%,and 80.3%,*** has good tolerance to wastewater pH and good pH ***,the flocculation treatment of coal chemical wastewater using the PAFC/P(DAC-MAPTAC-AM)compound also exhibits excellent resistance and buffering capacity.

关键词： Coal chemical wastewater Cationic flocculant Flocculation Coagulation Pretreatment

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Static magnetic field analysis of hollow-cup motor model and bow-shaped permanent magnet design

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Chinese Journal of Aeronautics 2022年第9期35卷 306-313页

作者： Jinji sun Gen XING Xinxiu zhou Haoxi sun Research Institute for Frontier Science Beihang UniversityBeijing 100083China Ningbo Institute of Technology Beihang UniversityNingbo 315800China School of Instrumentation and Optoelectronics Engineering Beihang UniversityBeijng 100083China

The hollow-cup Permanent Magnet(PM) motors have the characteristics of low power consumption, and are widely used in the aerospace field. At present, the tile-shaped PMs used by hollow-cup PM motors have poor sinusoidal characteristics of the air gap magnetic flux density waveform, which will cause torque ripple. The existing method for improving the air gap magnetic flux density waveform is not very effective when applied to hollow cup, a special motor with no stator core and large air gap. A bow-shaped PMs structure is designed for the hollow-cup motor in this paper. First, the equivalent surface current method is used to calculate the analytical formula of the static magnetic field of the model. Then, the Finite Element(FE) method is used to calculate the static air gap flux density waveform of conventional tile-shaped PMs and bow-shaped PMs with different bow heights, and the corresponding harmonics and sine distortion are obtained by Fourier decomposition. The simulation results show that the bow-shaped PMs can effectively improve the sinusoidal characteristics of the static air gap flux density waveform. And the suitable bow height is determined. Finally, a prototype is made based on the suitable bow height for experiments, and compared with the analytical result and the FE result, and the accuracy and effectiveness of the bow-shaped PMs with the suitable bow height are verified.

关键词： Air gap flux density Bow height Finite element Permanent magnet motor Static magnetic field

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Inverse aerodynamic design for distributed propulsion wing with expected circulation distribution

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Chinese Journal of Aeronautics 2024年第9期37卷 206-223页

作者： Pengbo sun zhou zhou Xu LI Kelei WANG School of Aeronautics Northwestern Polytechnical UniversityXi'an 710072China

Distributed Propulsion Wing(DPW)technology offers significant advantages in terms of flight energy savings,but the strong aerodynamic coupling between the propulsive internal flow and aerodynamic external flow brings significant design *** the primary DPW profile design is of great significance,this paper proposes a hybrid method to solve the inverse problem mainly based on the formula relationship between the required aerodynamic loads and the profile shape,which is more direct and instructive compared with traditional parametric iterative *** aerodynamic characteristics are described by the circulation distribution in the Fourier series form,then the mean camber line of the profile is solved through the re-derived airfoil theory considering disk's *** CFD correction methods are also *** validate the effectiveness and feasibility of the proposed hybrid inverse method,several DPW profile design tests are then ***,the relationship between 2D and realistic 3D unit shape is also *** results show that the proposed inverse design method has great accuracy and convergence speed in the design tests,and shows good robustness against changes of the design *** 2D profile shape and the actual 3D shape of DPW unit can establish an aerodynamic-propulsion equivalent relationship based on the same internal mass fluxes.

关键词： Propulsion Inverse problem Aerodynamic load Fourier series Flux

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A finite dimensional proof of the Verlinde formula

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Science China Mathematics 2020年第10期63卷 1935-1964页

作者： Xiaotao sun Mingshuo zhou Center of Applied Mathematics School of MathematicsTianjin UniversityTianjin 300072China

We prove two recurrence relations among dimensions Dg(r,d,ω):=dim H^0(UC,ω,ΘUC,ω)of spaces of generalized theta functions on the moduli spaces UC,ω.By using these recurrence relations,an explicit formula(the Verl... 详细信息

关键词： moduli space parabolic sheave generalized theta function Verlinde formula

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内蒙古农牧交错区典型黑土坡耕地土壤侵蚀空间分布特征

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水土保持研究 2025年第1期32卷 13-20页

作者：邹惠杰刘刚舒成博孙波刘亚张琼郭珍中国科学院教育部水土保持与生态环境研究中心黄土高原土壤侵蚀与旱地农业国家重点实验室中国科学院水利部水土保持研究所中国科学院大学西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室四川华标测检测技术有限公司

[目的]定量了解内蒙古典型黑土区土壤侵蚀速率，探究该区域土壤侵蚀空间分布特征，阐明土壤侵蚀坡面和区域空间分布规律，以期为区域水土流失治理提供参考。[方法]采集内蒙古农牧交错区（海拉尔区、额尔古纳市和牙克石市）典型黑土坡耕... 详细信息

[目的]定量了解内蒙古典型黑土区土壤侵蚀速率，探究该区域土壤侵蚀空间分布特征，阐明土壤侵蚀坡面和区域空间分布规律，以期为区域水土流失治理提供参考。[方法]采集内蒙古农牧交错区（海拉尔区、额尔古纳市和牙克石市）典型黑土坡耕地的土壤样品，利用137Cs示踪技术计算各采样点土壤侵蚀速率，结合小波分析的方法研究土壤侵蚀在坡面的分布特征。[结果]（1） 3个坡面所有采样点137Cs含量均小于背景值（1 984.24 Bq/m2）,表现为所有坡面土壤流失。（2） 3个地区的采样坡面平均侵蚀速率表现为：海拉尔[6 533.37 t/（km2·a）]>额尔古纳[4 174.35 t/（km2·a）]>牙克石[2 765.87 t/（km2·a）]。相同坡面的3个纵向断面的平均侵蚀速率相近，同一断面侵蚀速率的变异程度较高。（3）土壤侵蚀速率沿坡长呈强弱交替的周期性变化，但周期长度并不固定。大部分纵向断面存在周期长度为80～160 m和160～200 m的大小两个周期。部分纵向断面只存在一个周期长度为100～120 m的周期。[结论]该地区土壤侵蚀在坡面尺度表现为全坡面侵蚀且在纵向呈现周期性特征，在区域尺度呈现从东到西逐渐增加趋势。

关键词：土壤侵蚀典型黑土农牧交错带小波分析

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