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基于分层控制系统的农用拖拉机减振系统研究

农机化研究 2025年第4期47卷 258-263页

作者：张雨熊正凯曹艳忙张铁汉沧州职业技术学院河北沧州061000

为了解决拖拉机在高速运输作业时受路面不平度影响易产生剧烈颠簸振动的问题,提高拖拉机操纵稳定性和行驶平顺性,以拖拉机悬架减振为研究目标,提出一种基于分层控制系统的农用拖拉机减振系统。系统采用了多级减振结构,将整个减振控制过... 详细信息

为了解决拖拉机在高速运输作业时受路面不平度影响易产生剧烈颠簸振动的问题,提高拖拉机操纵稳定性和行驶平顺性,以拖拉机悬架减振为研究目标,提出一种基于分层控制系统的农用拖拉机减振系统。系统采用了多级减振结构,将整个减振控制过程分为了3个层次,即传感器层、控制层和执行层,实现了数据采集、信号处理、控制指令生成和执行等功能。最后,通过仿真模拟进行试验验证,结果表明:系统可以显著降低农用拖拉机的振动,分层算法的控制性能优于常规PID控制,可为提高拖拉机行驶的稳定性和舒适性提供技术参考和理论借鉴,具有较好的应用前景。

关键词：农用拖拉机减振系统分层控制系统传感器层控制层执行层

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Zwitterionic hyaluronic acid derivatives for co-delivery of both chemotherapeutic and nucleic acid drugs in breast cancer treatment

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Nano Research 2025年第1期18卷 607-617页

作者： Ruo-Lin Jiang Hui-Na Liu yu-Fan Yang Zhi-Cheng zhang Qi Dai Xiao-Yan Bao Lin-Jie Wu Ya-Xin Qin Xin Tan Xiao-Yan Sun Xu-Fang Ying Zhi-Qing Ben Min Han Institute of Pharmaceutics College of Pharmaceutical SciencesZhejiang UniversityHangzhou 310058China Department of Radiation Oncology Key Laboratory of Cancer Prevention and InterventionThe Second Affiliated HospitalCollege of MedicineZhejiang UniversityHangzhou 310058China Hangzhou Institute of Innovative Medicine Zhejiang UniversityHangzhou 310058China Jinhua Institute of Zhejiang University Jinhua 321299China National Key Laboratory of Advanced Drug Delivery and Release Systems Zhejiang UniversityHangzhou 310058China Polytechnic institute Zhejiang UniversityHangzhou 310015China

Traditionally,hyaluronic acid has been widely used for drug delivery,but the current application bottleneck is that hyaluronic acid is hydrophilic and electronegative,which makes it difficult to carry hydrophobic drugs and small interfering RNA(siRNA)with the same *** on previous studies,we designed and synthesized hyaluronic acid nanocarriers HA-spermine/N,N,N-trimethylcystamine/DOX-TPP(HSTD)for loading siRNA to overcome the problem of siRNA release caused by strong electrostatic ***,N,N,Ntrimethylcystamine in the carrier can be degraded by intracellular glutathione to completely and rapidly release siRNA,thus promoting ***,when codelivered with the chemotherapy drug doxorubicin(DOX),this novel nanocarrier showed promising synergy in inhibiting tumor growth.

关键词： zwitterionic hyaluronic acid N N N-trimethylcystamine small interfering RNA(siRNA) doxorubicin

CFD Study of NO_x Emissions in a Model Commercial Aircraft Engine Combustor

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Chinese Journal of Aeronautics 2012年第6期25卷 854-863页

作者： zhang man FU Zhenbo LIN yuzhen LI Jibao AVIC Commercial Aircraft Engine Co. Ltd. Shanghai 200241 China National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics Beihang University Beijing 100191 China

Air worthiness requirements of the aircraft engine emission bring new challenges to the combustor research and design. With the motivation to design high performance and clean combustor, computational fluid dynamics （CFD） is utilized as the powerful design approach. In this paper, Reynolds averaged Navier-Stokes （RANS） equations of reactive two-phase flow in an experimental low emission combustor is performed. The numerical approach uses an implicit compressible gas solver together with a Lagrangian liquid-phase tracking method and the extended coherent flamelet model for turbulence-combustion interaction. The NOx formation is modeled by the concept of post-processing, which resolves the NOx transport equation with the assumption of frozen temperature distribution. Both turbulence-combustion interaction model and NOx formation model are firstly evaluated by the comparison of experimental data published in open literature of a lean direct injection （LDI） combustor. The test rig studied in this paper is called low emission stirred swirl （LESS） combustor, which is a two-stage model combustor, fueled with liquid kerosene （RP-3） and designed by Beihang University （BUAA）. The main stage of LESS combustor employs the principle of lean prevaporized and premixed （LPP） concept to reduce pollutant, and the pilot stage depends on a diffusion flame for flame stabili-zation. Detailed numerical results including species distribution, turbulence performance and burning performance are qualita-tively and quantitatively evaluated. Numerical prediction of NOx emission shows a good agreement with test data at both idle condition and full power condition of LESS combustor. Preliminary results of the flame structure are shown in this paper. The flame stabilization mechanism and NOx reduction effort are also discussed with in-depth analysis.

关键词： air worthiness computational fluid dynamics low emission combustor lean prevaporized and premixed NOx reduction

关注学习路上的慢跑者——苏霍姆林斯基“学困生”教育思想及启示

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兵团教育学院学报 2025年第1期35卷 56-64页

作者：王福关满姗翟玉洁石河子大学师范学院/兵团教育学院新疆石河子832003 石河子大学师范学院新疆石河子832003

苏霍姆林斯基在长期的教育实践中,形成了其独特的学困生教育观。本研究基于苏霍姆林斯基关于学困生的教育思想,主要从学校教育和家庭教育两方面分析了学困生的成因,并提出了相应的转化策略。苏霍姆林斯基的教育思想对当下学困生教育有... 详细信息

苏霍姆林斯基在长期的教育实践中,形成了其独特的学困生教育观。本研究基于苏霍姆林斯基关于学困生的教育思想,主要从学校教育和家庭教育两方面分析了学困生的成因,并提出了相应的转化策略。苏霍姆林斯基的教育思想对当下学困生教育有着重要启示,应让学生养成良好的学习习惯和学习的自觉性,构建学校的全面育人系统,强化教师的主导作用,引导学困生发挥自我转化的主体作用。

关键词：学困生苏霍姆林斯基转化策略启示

The Heat Transfer Coefficients of the Heating Surface of 300 MWe CFB Boiler

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Journal of Thermal Science 2012年第4期21卷 368-376页

作者： WU Haibo zhang man LU Qinggang SUN yunkai Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing 100190China . Graduate University of Chinese Academy of Sciences Beijing 100049China

A study of the heat transfer about the heating surface of three commercial 300 MWe CFB boilers was conducted in this work. The heat transfer coefficients of the platen heating surface, the external heat exchanger (EHE) and cyclone separator were calculated according to the relative operation data at different boiler loads. Moreover, the heat transfer coefficient of the waterwall was calculated by heat balance of the hot circuit of the CFB boiler. With the boiler capacity increasing, the heat transfer coefficients of these heating surface increases, and the heat transfer coefficient of the water wall is higher than that of the platen heating surface. The heat transfer coefficient of the EHE is the highest in high boiler load, the heat transfer coefficient of the cyclone separator is the lowest. Because the fired coal is different from the design coal in No.1 boiler, the ash content of the fired coal is much lower than that of the design coal. The heat transfer coefficients which calculated with the operation data are lower than the previous design value and that is the reason why the bed temperature is rather high during the boiler operation in No.1 boiler.

关键词： CFB boiler heating surface heat transfer coefficient calculation

2D phosphides heterostructures on titanium microfiltration membrane for enhanced ampere-level current density overall seawater splitting

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Nano Research 2025年第1期18卷 249-259页

作者： Wenjing Dai Xin Wang yulong Ma Sisi He Ming Chen Zhaohui Yin Shuheng Tian Maolin Wang Shixiang yu Hang zhang yuanzhe Wang Hong Wang Jianxin Li Faming Gao Bowen Cheng yun Wang Zhen Yin Ding Ma Tianjin Key Laboratory of Brine Chemical Engineering and Resource Eco-utilization College of Chemical Engineering and Materials ScienceTianjin University of Science and TechnologyTianjin 300457China State Key Laboratory of Biobased Fiber manufacturing Technology Tianjin University of Science and TechnologyTianjin 300457China Haian Institute of High-Tech Research Nanjing UniversityHaian 226600China Beijing National Laboratory for Molecular Sciences College of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China State Key Laboratory of Separation Membranes and Membrane Processes Separation Membrane Science and Technology International Joint Research CentreTiangong UniversityTianjin 300387China Centre for Catalysis and Clean Energy School of Environment and ScienceGold Coast CampusGriffith UniversitySouthportQueensland 4222Australia

The advancement of direct seawater electrolysis is a significant step towards sustainable hydrogen production,addressing the critical need for renewable energy sources and efficient resource ***,direct seawater electrolysis has to face several challenges posed by the corrosiveness of highly concentrated chloride and the competitive chlorine evolution reaction(ClER).To overcome these issues,we designed a novel NiP_(2)@CoP electrocatalyst on a porous titanium microfiltration(Ti MF)*** obtained bifunctional NiP_(2)@CoP catalyst outperforms the Pt/C and IrO_(2),as evidenced by its low overpotentials of 192 and 425 mV at a current density of 500 mA·cm^(-2) for hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)in alkaline seawater(1 M KOH+0.5 M NaCl),***,only 231 and 569 mV overpotentials are required at the current density of 1500 mA·cm^(-2) towards HER and OER in alkaline seawater,*** importantly,no ClER was observed,demonstrating its excellent selectivity to *** selection of porous Ti MF membrane as an electrode substrate further enhances the performance by providing a robust structure that promotes the fast generation and release of gas *** promising outcomes obtained with NiP_(2)@CoP catalysts on Ti MF support,therefore,pave the way for the commercial viability of direct seawater electrolysis technologies at industrial-level current densities.

关键词： direct seawater electrolysis porous titanium microfiltration membrane phosphides heterostructures NiP_(2)@CoP electrocatalyst excellent selectivity to oxygen evolution reaction(OER)

A robust shell element in meshfree SPH method

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Acta Mechanica Sinica 2013年第2期29卷 241-255页

作者： Fu-Ren Ming A-man zhang Xue-Yan Cao College of Shipbuilding Engineering Harbin Engineering University

With the incorporation of total Lagrangian smoothed particle hydrodynamics（SPH） method equation and moving least square（MLS） function,the traditional SPH method is improved regarding the stability and *** on Mindlin-Ressiner plate theory,the SPH method simulating dynamic behavior via one layer of particles is applied to plate＇s mid-plane,i.e.,a SPH shell model is ***,through comparative analyses on the dynamic response of square,stiffened shells and cylindrical shells under various strong impact loads with common finite element software,the feasibility,validity and numerical accuracy of the SPH shell method are ***,further researches on SPH shell may well pave the way towards solving problems involving dynamic plastic damage,tearing or even crushing.

关键词： SPH shell Total Lagrangian equation Moving least square (MLS) Stability Consistency Stress point

Improved Mechanical Properties of Poly(butylene succinate) Membrane by Co-electrospinning with Gelatin

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Chinese Journal of Polymer Science 2018年第9期36卷 1063-1069页

作者： Lu Chen Hui-Hui Cheng Jiang Xiong Ya-Ting Zhu Hong-Peng zhang Xi Xiong yu-man Liu Jian yu Zhao-Xia Guo Key Laboratory of Advanced Materials (Ministry of Education) Department of Chemical Engineering Tsinghua University Department of Vascular and Endovascular Surgery Chinese PLA General Hospital

Gelatin, a natural proteinous polymer, was used to co-electrospin with poly（butylene succinate）（PBS） in order to improve the mechanical properties of PBS membrane and facilitate its applications in biomedical field. The PBS/gelatin blend membranes have narrower distribution of fiber diameter and smoother surface than neat PBS membrane. The contact angles, water absorption rates and water uptakes of the PBS/gelatin blend membranes were measured, showing increased hydrophilicity. The interaction between PBS and gelatin was investigated by attenuated total reflectance Fourier transform infrared spectroscopy （ATR-FTIR） and differential scanning calorimetry （DSC）. The mechanical properties of PBS/gelatin blend membranes in both dry and wet states were evaluated by uniaxial tensile tests. In the dry state, the PBS/gelatin blend membrane containing 10% gelatin has a 3-times increase in tensile strength without any adverse effect on ductility because of the existence of interaction between the two blend components, little change in crystallinity of PBS, and possible interaction between any adjacent fibers; the tensile strength and elongation at break are even better in the wet state attributed to some gelatin on fiber surfaces, which act as a binder in the presence of water. The potential applications of PBS/gelatin blend membranes were demonstrated by successful immobilization of thrombin, a clinically-used hemostatic drug. The thrombin-loaded membrane could be used for rapid hemostasis.

关键词： PBS Gelatin Electrospinning Mechanical properties Blending

A comparative analysis of small RNAs between two Upland cotton backcross inbred lines with different fiber length: Expression and distribution

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The Crop Journal 2019年第2期7卷 198-208页

作者： Guoyuan Liu man Wu Wenfeng Pei Xihua Li Nuohan Wang Jianjiang Ma Xinshan Zang Shuxun yu Jinfa zhang Jiwen yu State Key Laboratory of Cotton Biology Cotton Institute of the Chinese Academy of Agricultural Sciences Key Laboratory of Cotton Genetic Improvement Ministry of Agriculture Department of Plant and Environmental Sciences New Mexico State University

The cotton fiber is the most important raw material for the textile industry and an ideal model system for studying cell elongation. However, the genetic variation of fiber elongation in relation to miRNA is poorly understood. A high-throughput comparative RNA-seq of two lines differing in fiber length(FL) from a backcross inbred line(BIL)population of G. hirsutum × G. barbadense revealed differentially expressed(DE) miRNAs and their targets in rapidly elongating fibers. A real-time quantitative PCR analysis was further performed to validate the results. A total of 463(including 47 DE) miRNAs were identified,and seven DE miRNAs were co-localized with seven FL quantitative trait loci(QTL)identified in the G. hirsutum × G. barbadense population. Of 82(including 21 DE) targets identified, nine(including one DE) were also co-localized with the seven FL QTL. The relationship between the allopolyploid and its diploid ancestral species with respect to miRNAs and their targets was also characterized. These results will facilitate the understanding of the molecular genetic mechanism of fiber elongation with regards to miRNAs in cotton.

关键词： Allopolyploid Gossypium Fiber elongation miRNA QTL hotspots