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Development of the electric automatic steering system for agricultural vehicles

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International Journal of Agricultural and Biological Engineering 2024年第1期17卷 209-214页

作者： Guangshun An chong yu Juan Du Xiang Yin Youliang Ni Chengqian Jin School of Agricultural Engineering and Food Science Shandong University of TechnologyZibo 255000ShandongChina Nanjing Research Institute for Agricultural Mechanization of Ministry of Agriculture and Rural Affairs Nanjing 210014China

Automatic guidance of agricultural vehicles requires automatic execution of operation commands received from the navigation controller by using electronically controlled mechanisms for wheel steering,speed changing and work implementing.Automatic steering contributes as a prerequisite technique in automatic and semi-automatic agricultural navigation.This research aimed to develop an electric automatic steering system that was compact in its structure and integrated into original steering mechanism in a simply and convenient way for aftermarket modification.A brushless motor and reducer assembly was utilized to provide an adequate steering torque instead of manual maneuver.A rapid assembling approach was proposed by passing the steering shaft through the hollow output shaft.A digital proportional-integral-differential(PID)algorithm was implemented to calculate the rotation speeds and directions by comparing the desired angle and the actual angle,which was implemented in a printed circuit board with a microcontroller unit(MCU)and interface chips.An unmanned wheeled tractor was applied as test platform to integrate the newly developed electric automatic steering system.Tests were conducted to evaluate its performance in terms of stability and responsiveness.An autonomous navigation system guided the tractor along target paths in the field by sending steering commands to the electric automatic steering system.The results show that the steering angle error was less than 0.81°when desired steering angle was less than 10°.The lateral error difference was no more than 4.76 cm when repeating following the same target path,which indicated that the electric automatic steering system responded accurately and robustly to steering commands.

关键词： automatic steering automatic navigation agricultural vehicles

Analgesic and anti-inflammatory activity of Cotinus coggygria Scop.extracts in vivo

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Asian Pacific Journal of Tropical Biomedicine 2024年第6期14卷 225-235页

作者： Kai Lu chong-yu Yang Zhao-Hong Yan Department of Anesthesiology Qiantang Campus Sir Run Run Shaw HospitalSchool of MedicineZhejiang UniversityHangzhou310018China Department of Anesthesiology 3201 HospitalHanzhong723000China Department of Anesthesiology The Second Affiliated Hospital of the Chinese People’s Liberation Army Air Force Medical UniversityXi’an710038China

Objective:To assess the analgesic and anti-inflammatory effects of standardized extract of Cotinus coggygria(C.coggygria)in different animal models.Methods:C.coggygria extracts(25,50,and 100 mg/kg)were administered to rats and mice(n=6)during hot plate,tail-flick,acetic acid-induced writhing,and formalin tests to determine its analgesic efficacy.The anti-inflammatory activity of C.coggygria extracts was evaluated by histamine and carrageenan-induced paw edema,cotton pellet-induced granuloma,and acetic acid-induced peritoneal capillary dye leakage tests.Results:C.coggygria extracts(50 and 100 mg/kg)significantly alleviated thermal and chemical-induced pain in rodents(P<0.05).It also demonstrated notable anti-inflammatory properties by mitigating histamine and carrageenan-induced paw edema,granuloma deposits,and vascular permeability(P<0.05).Moreover,C.coggygria extracts remarkably reduced TNF-α,IL-1β,IL-6,COX-2,and oxidative stress in rat paws(P<0.05).Carrageenan-induced histological aberrations in hind paw tissues were effectively(P<0.05)mitigated by treatment with C.coggygria extracts.Conclusions:C.coggygria Scop.extracts show analgesic and anti-inflammatory effects via inhibition of COX-2 and inflammatory and oxidative mediators.

关键词： Antioxidant Carrageenan Cotinus coggygria Scop. Anti-inflammatory Analgesic Pain TNF-α Fustin

Data mining and mathematical models in cancer prognosis and prediction

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Medical Review 2022年第3期2卷 285-307页

作者： chong yu Jin Wang Department of Chemistry and of Physics and Astronomy State University of New York at Stony BrookStony BrookNY 11794-3400USA State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchunJilinChina Department of Statistics JiLin University of Finance and EconomicsChangchunJilin ProvinceChina

Cancer is a fetal and complex disease.Individual differences of the same cancer type or the same patient at different stages of cancer development may require distinct treatments.Pathological differences are reflected in tissues,cells and gene levels etc.The interactions between the cancer cells and nearby microenvironments can also influence the cancer progression and metastasis.It is a huge challenge to understand all of these mechanistically and quantitatively.Researchers applied pattern recognition algorithms such as machine learning or data mining to predict cancer types or classifications.With the rapidly growing and available computing powers,researchers begin to integrate huge data sets,multi-dimensional data types and information.The cells are controlled by the gene expressions determined by the promoter sequences and transcription regulators.For example,the changes in the gene expression through these underlying mechanisms can modify cell progressing in the cell-cycle.Such molecular activities can be governed by the gene regulations through the underlying gene regulatory networks,which are essential for cancer study when the information and gene regulations are clear and available.In this review,we briefly introduce several machine learning methods of cancer prediction and classification which include Artificial Neural Networks(ANNs),Decision Trees(DTs),Support Vector Machine(SVM)and naive Bayes.Then we describe a few typical models for building up gene regulatory networks such as Correlation,Regression and Bayes methods based on available data.These methods can help on cancer diagnosis such as susceptibility,recurrence,survival etc.At last,we summarize and compare the modeling methods to analyze the development and progression of cancer through gene regulatory networks.These models can provide possible physical strategies to analyze cancer progression in a systematic and quantitative way.

关键词： flux gene regulatory network landscape machine learning ordinary differential equations stochastic differential equations

Elaborating strengthen mechanism of Pt-Ir solid solution superalloy at finite temperature

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Rare Metals 2024年第3期43卷 1243-1256页

作者： Wei yu Xiao-yu chong yun-Xuan Zhou Meng-Di Gan Ying-Xue Liang Yan Wei Ai-Min Zhang Chang-Yi Hu Xing-yu Gao Li Chen Hai-Feng Song Jing Feng Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming650093China yunnan Precious Metals Laboratory Co.LTD Kunming650106China Laboratory of Computational Physics Institute of Applied Physics and Computational MathematicsBeijing100088China

Pt-Ir alloy is potential superalloys used above 1300℃because of their high strength and creep resistance.However,the ductility of Pt-Ir alloy has rapidly deteriorated with the increase of Ir,resulting in poor machinability.This work quantitatively evaluated the solid solution strengthening(SSS)and grain refinement strengthening(GRS)of Pt-Ir alloy using first-principles calculations combined with experimental characterization.Here,the stretching force constants in the second nearest neighbor region(SFC^(2nd))of pure Ir(193.7 eV·nm^(-2))are 3.40 times that of pure Pt(57.0 eV·nm^(-2)),i.e.,the interatomic interaction is greatly enhanced with the increase of Ir content,which leads to the decrease of ductility,and modulus misfit plays a dominant role in SSS.Then,the physical mechanisms responsible for the hardness(H_(V))of Pt-Ir alloy,using the power-law-scaled function of electron work function coupled SSS and GRS,are attributed to the electron redistribution caused by different Ir content.Furthermore,a thorough assessment of the thermodynamic characteristics of Pt-Ir binary alloy was conducted,culminating in development of a mapping model that effectively relates enmposition,temperature and strength.The results revealed that the compressive strength incrcases with the Ir content,and the highest strength was observed in Pt_(0.25)Ir_(0.75).This study provides valuable insights into the Pt-Ir alloy system.

关键词： Elastic properties Phonon Solid solution strengthen Force constants CALPHAD

Non-alcoholic fatty liver disease and sleep disorders

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World Journal of Hepatology 2024年第3期16卷 304-315页

作者： Lu-Fang Bu chong-yu Xiong Jie-Yi Zhong Yan Xiong Dong-Ming Li Fen-Fang Hong Shu-Long Yang Department of Physiology Fuzhou Medical CollegeNanchang UniversityFuzhou 344000Jiangxi ProvinceChina Key Laboratory of Chronic Diseases Fuzhou Medical UniversityFuzhou 344000Jiangxi ProvinceChina Technology Innovation Center of Chronic Disease Research in Fuzhou City Fuzhou Science and Technology BureauFuzhou 344000Jiangxi ProvinceChina Experimental Center of Pathogen Biology College of MedicineNanchang UniversityNanchang 330006Jiangxi ProvinceChina

Studies have shown that non-alcoholic fatty liver disease(NAFLD)may be associated with sleep disorders.In order to explore the explicit relationship between the two,we systematically reviewed the effects of sleep disorders,especially obstructive sleep apnea(OSA),on the incidence of NAFLD,and analyzed the possible mechanisms after adjusting for confounding factors.NAFLD is independently associated with sleep disorders.Different sleep disorders may be the cause of the onset and aggravation of NAFLD.An excessive or insufficient sleep duration,poor sleep quality,insomnia,sleep-wake disorders,and OSA may increase the incidence of NAFLD.Despite that some research suggests a unidirectional causal link between the two,specifically,the onset of NAFLD is identified as a result of changes in sleep characteristics,and the reverse relationship does not hold true.Nevertheless,there is still a lack of specific research elucidating the reasons behind the higher risk of developing sleep disorders in individuals with NAFLD.Further research is needed to establish a clear relationship between NAFLD and sleep disorders.This will lay the groundwork for earlier identification of potential patients,which is crucial for earlier monitoring,diagnosis,effective prevention,and treatment of NAFLD.

关键词： Non-alcoholic fatty liver disease Sleep duration Sleep quality Sleep disorders Obstructive sleep apnea

Reversible Mn^(2+)/Mn^(4+)double-electron redox in P3-type layer-structured sodium-ion cathode

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Journal of Energy Chemistry 2024年第2期89卷 79-88,I0004页

作者： Jie Zeng Jian Bao Ya Zhang Xun-Lu Li Cui Ma Rui-Jie Luo chong-yu Du Xuan Xu Zhe Mei Zhe Qian Yong-Ning Zhou Department of Materials Science Fudan UniversityShanghai 200433China Shanghai Xuanyi New Energy Development Co. LtdShanghai 201800China Global Institute of Future Technology Shanghai Jiao Tong UniversityShanghai 200240China

The balance between cationic redox and oxygen redox in layer-structured cathode materials is an important issue for sodium batteries to obtain high energy density and considerable cycle stability.Oxygen redox can contribute extra capacity to increase energy density,but results in lattice instability and capacity fading caused by lattice oxygen gliding and oxygen release.In this work,reversible Mn^(2+)/Mn^(4+)redox is realized in a P3-Na_(0.65)Li_(0.2)Co_(0.05)Mn_(0.75)O_(2)cathode material with high specific capacity and structure stability via Co substitution.The contribution of oxygen redox is suppressed significantly by reversible Mn^(2+)/Mn^(4+)redox without sacrificing capacity,thus reducing lattice oxygen release and improving the structure stability.Synchrotron X-ray techniques reveal that P3 phase is well maintained in a wide voltage window of 1.5-4.5 V vs.Na^(+)/Na even at 10 C and after long-term cycling.It is disclosed that charge compensation from Co/Mn-ions contributes to the voltage region below 4.2 V and O-ions contribute to the whole voltage range.The synergistic contributions of Mn^(2+)/Mn^(4+),Co^(2+)/Co^(3+),and O^(2-)/(O_n)^(2-)redox in P3-Na_(0.65)Li_(0.2)Co_(0.05)Mn_(0.75)O_(2)lead to a high reversible capacity of 215.0 m A h g^(-1)at 0.1 C with considerable cycle stability.The strategy opens up new opportunities for the design of high capacity cathode materials for rechargeable batteries.

关键词： Sodium batteries Cathode materials Layered structure Co substitution

A case study of blasting vibration attenuation based on wave component characteristics

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第5期15卷 1298-1311页

作者： chong yu Haibo Li Haozhen yue Xiaohu Wang Xiang Xia State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China

A typical blasting vibration wave is a composite wave,and its attenuation law is affected by the type of dominant wave component.The purpose of the present study is to establish an attenuation equation of the peak particle velocity(PPV),taking into account the attenuation characteristics of P-,S-and R-waves in the blasting vibration wave.Field blasting tests were carried out as a case to specifically apply the proposed equation.In view of the fact that the discrete properties of rock mass will inevitably cause the uncertainty of blasting vibration,we also carried out a probability analysis of PPV uncertainty,and introduced the concept of reliability to evaluate blasting vibration.The results showed that the established attenuation equation had a higher prediction accuracy,and can be considered as a promising equation implemented on more complex sites.The adopted uncertainty analysis method can comprehensively take account of the attenuation law of blasting vibration measured on site and discrete properties of rock masses.The obtained distribution of the PPV uncertainty factor can quantitatively evaluate the reliability of blasting vibration,which is a powerful and necessary supplement to the PPV attenuation equation.

关键词： Blasting vibration Wave component Field blasting tests Attenuation equation Uncertainty analysis Bayesian theory

Angular momentum dependence of quasifission dynamics in the reaction ^(48)Ca+^(244)Pu

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Science China(Physics,Mechanics & Astronomy) 2017年第9期60卷 22-27页

作者： chong yu Lu Guo School of Physics University of Chinese Academy of Sciences

The quasifission dynamics in the reaction ^(48)Ca+^(244)Pu is investigated in the framework of time-dependent Hartree-Fock(TDHF)theory. The calculations are performed in three-dimensional Cartesian coordinate without any symmetry restrictions. The full Skyrme energy functional is incorporated in our TDHF implementation. The quasifission dynamics is quite sensitive to the angular momentum of colliding system. The contact time of quasifission decreases as a function of angular momentum and then forms a plateau with small oscillations. The quasifission process is accompanied by an important multi-nucleon transfer. The quantum shell effect plays a crucial role in the mass and charge of quasifission fragments. The mass-angle distribution of the fragments is calculated, which can be compared directly with future experiments.

关键词：准裂变角动量动力学反应接触时间直角坐标系碰撞系统裂变碎片

Three new sesquiterpenes from roots of Curcuma longa

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Chinese Herbal Medicines 2023年第3期15卷 470-474页

作者： Jie Zhang Xiaorui Ma Wei Wang Caixia Wu Ben Ma chong yu Haifeng Wang School of Traditional Chinese Materia Medica Shenyang Pharmaceutical UniversityShenyang 110016China Sinopharm Tongmei General Hospital Datong 037001China

Objective:To study the chemical constituents from the roots of Curcuma longa.Methods:The structures of the compounds were elucidated based on extensive spectral analysis,including 1D and 2D NMR,MS,UV,and CD analysis.Results:Two new sesquiterpene compounds(1S,2R,5R,7S,8R)-2,8-epoxy-5-hydroxybisabola-3,10-dioen-9-one(1),(1R,2R,5R,7S,8R)-2,8-epoxy-5-hydroxybisabola-3,10-dioen-9-one(2),and a new natural product 6-(4-Hydroxymethylphenyl)-2-methyl-hept-2-ene-4-one(3)together with three known compounds ar-turmerone(4),2-methyl-6-(4-hydroxyphenyl-3-methyl)-2-hepten-4-one(5)and 2-methyl-6-(4-hydroxyphenyl)-2-hepten-4-one(6)were isolated from C.longa root extract with 95%ethanol.Conclusion:In the study,three new compounds were isolated from C.longa,and their absolute configurations were determined.

关键词： Curcuma longa L. chemical compositioncurcumin NMR sesquiterpenes