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Modeling and experiments of chewing mechanical properties of pellet feed using discrete element method

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International Journal of Agricultural and Biological Engineering 2020年第4期13卷 37-44页

作者： fei peng Zhigang Huang fang fang School of Artificial Intelligence Beijing Technology and Business UniversityBeijing 100048China Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics Beijing Technology andBusiness UniversityBeijing 100048China College of Chemical Engineering Zhengzhou UniversityZhengzhou 450001China

In order to explore the mechanical properties and breaking behavior of pellet feed during chewing,the experiments of texture mechanics,followed by the modeling and simulation of pellet feed based on the discrete element method were carried out in this *** wet basis moisture contents(8%,10%,12%,14%and 16%,respectively),two kinds of loading directions(L and D direction,respectively)of pig pellet feed were selected as ***,mechanical parameters including hardness,elasticity,tackiness and chewiness were measured by a texture *** results of compression tests showed that the hardness of pig pellet feed was 5.44-32.43 N,the elastic index was 0.04-0.94 mm,the tackiness was 0.07-6.63 N,the chewiness was 5.52-27.39 ***,the hardness,tackiness and chewiness of pig pellet feed decreased significantly with the increase of moisture content but the elasticity showed an adverse varying *** hardness,elasticity,tackiness and chewiness along D direction outweighed that of L direction in numerical data at the same moisture ***,the chewing and breaking processes of pellet feed were simulated based on the discrete element method(DEM)combined with bonding particle model,in which the whole pellet feed were considered as agglomerations of micro-particles and broke when the stress between micro-particles had exceeded the maximum ***-parameter optimization experiments were carried out using quadratic orthogonal rotation design,in which stiffness coefficient(X_(1)),critical stress(X2)and bonding radius(X_(3))were the influencing factors,hardness(Y_(1)),elasticity(Y_(2)),tackiness(Y_(3))and chewiness(Y_(4))were evaluating *** on the regression analysis of the Design-Expert 8.0.6 software and response surface analysis method,the relationship between the three influencing factors and evaluating indicators was *** similarity between experimental and simulated results in feed morphology and mechanical index proved

关键词： discrete element method pellet feed texture mechanics mechanical parameters palatability

Mean shift texture surface detection based on WT and COM feature image selection

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第6期7卷 969-975页

作者： HAN Yan-fang SHI peng-fei Institute of lmage Processing and Pattern Recognition Shanghai Jiao Tong University Shanghai 200030 China

Mean shift is a widely used clustering algorithm in image segmentation. However, the segmenting results are not so good as expected when dealing with the texture surface due to the influence of the textures. Therefore, an approach based on wavelet transform (WT), co-occurrence matrix (COM) and mean shift is proposed in this paper. First, WT and COM are employed to extract the optimal resolution approximation of the original image as feature image. Then, mean shift is successfully used to obtain better detection results. Finally, experiments are done to show this approach is effective.

关键词： Mean shift Wavelet transform (WT) Co-occurrence matrix (COM) Texture defect detection

基于JSP+JavaBean的OSITS的设计

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微机发展 2004年第11期14卷 25-26,29页

作者：方鹏飞岳成庆东南大学计算机科学与工程系江苏南京210096

组件技术广泛应用于基于Web的教学软件的开发中,为智能教学系统的设计提供了一种新的手段。文中阐述了基于JSP+JavaBean的操作系统智能教学系统(OSITS)的设计与实现。系统结合现代操作系统课程的自身特点,在表示元知识点9元组结构的基... 详细信息

组件技术广泛应用于基于Web的教学软件的开发中,为智能教学系统的设计提供了一种新的手段。文中阐述了基于JSP+JavaBean的操作系统智能教学系统(OSITS)的设计与实现。系统结合现代操作系统课程的自身特点,在表示元知识点9元组结构的基础上设计了一个具有树状层次结构含专属文件夹的知识库结构。采用JavaBean组件技术,把系统中的各个功能模块封装成一个个的Bean,提高了系统的开发速度、效率、可维护性及模块的可重用性。

关键词： Java服务器页 JavaBeam操作系统智能教学系统

O2O外卖平台商业模式及其发展前景分析——以美团外卖为例

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物流工程与管理 2019年第11期41卷 113-114,109页

作者：贾雨桐彭芳菲姜泓宇刘可南京工程学院经济与管理学院

O2O外卖商业新模式在近年来迅速发展,足不出户便送餐上门,为人们的日常生活提供了巨大便利,无不让人感叹当下O2O外卖平台的发展迅速。为了研究O2O外卖平台商业模式及其发展前景,文中采取调查问卷、实地考察、任务访谈等多种方式,深入剖... 详细信息

O2O外卖商业新模式在近年来迅速发展,足不出户便送餐上门,为人们的日常生活提供了巨大便利,无不让人感叹当下O2O外卖平台的发展迅速。为了研究O2O外卖平台商业模式及其发展前景,文中采取调查问卷、实地考察、任务访谈等多种方式,深入剖析了美团外卖的商业模式和存在的问题,并对其发展前景进行分析。

关键词： O2O外卖平台美团外卖商业模式发展前景

控制方向未知的受限多智能体系统的预设时间模糊控制

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工程科学学报 2025年第1期47卷 121-129页

作者：李菲周超范利蓉王芳燕山大学理学院秦皇岛066004 河北农业大学海洋学院秦皇岛066003

综合考虑受控制方向未知、输入受限和状态时延影响的有领导者多智能体系统的编队控制问题,设计基于模糊逻辑系统的预设时间一致性控制策略.为了保证编队输出误差在预设时间内满足预定的约束范围要求,引入预设时间性能函数,构造Lyapunov-... 详细信息

综合考虑受控制方向未知、输入受限和状态时延影响的有领导者多智能体系统的编队控制问题,设计基于模糊逻辑系统的预设时间一致性控制策略.为了保证编队输出误差在预设时间内满足预定的约束范围要求,引入预设时间性能函数,构造Lyapunov-Krasovskii(L-K)泛函解决状态时延问题,将外界干扰和L-K泛函的导数中的部分项定义为未知非线性函数,并利用模糊逻辑系统对其进行估计,利用Nussbaum函数和均值定理分别处理控制方向未知和输入受限问题,基于以上设计,提出预设时间模糊控制策略,并通过Lyapunov稳定性理论,分析闭环系统的有界稳定性,数值对比仿真和两级化学反应器应用仿真说明控制方法的有效性.

关键词：多智能体系统状态时延输出误差约束输入受限控制方向未知

Ammonia removal from low-strength municipal wastewater by powdered resin combined with simultaneous recovery as struvite

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Frontiers of Environmental Science & Engineering 2021年第1期15卷 125-134页

作者： Kuo fang fei peng Hui Gong Huanzhen Zhang Kaijun Wang State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China School of Water Resources&Environment China University of GeosciencesBeijing 100083China

Low-strength municipal wastewater is considered to be a recoverable nutrient resource with economic and environmental ***,various technologies for nutrient removal and recovery have been *** this paper,powdered ion exchange resin was employed for ammonia removal and recovery from imitated low-strength municipal *** effects of various working conditions(powdered resin dosage,initial concentration,and pH value)were studied in batch experiments to investigate the feasibility of the approach and to achieve performance *** maximum adsorption capacity determined by the Langmuir model was 44.39 mg/g,which is comparable to traditional ion exchange ***,the effects of co-existing cations(Ca^(2+),Mg^(2+),K^(+))were *** on the above experiments,recovery of ammonia as struvite was successfully achieved by a proposed two-stage crystallization process coupled with a powdered resin ion exchange *** electron microscopy(SEM)and X-ray diffractometry(XRD)results revealed that struvite crystals were successfully gained in alkaline conditions(pH=10).This research demonstrates that a powdered resin and two-stage crystallization process provide an innovative and promising means for highly efficient and easy recovery from low-strength municipal wastewater.

关键词： Ammonia removal and recovery Powdered resin Crystallization process Struvite Co-existing cations

用冻干菌液进行猪丹毒、多杀性巴氏杆菌病二联灭活疫苗效力检验的研究

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中国兽药杂志 2019年第11期53卷 22-27页

作者：邵庆红邢佳鹏朱文革张连祥方鹏飞北京华信农威生物科技有限公司

在猪丹毒、多杀性巴氏杆菌病二联灭活疫苗的效力检验中,需要进行动物攻毒保护试验。传统方法使用的是2~8℃保存的新鲜菌液对试验动物进行攻毒。本研究中使用的是低温保存的冻干菌液,并对冻干保存的菌数进行了测定和优化。结果表明,冻干... 详细信息

在猪丹毒、多杀性巴氏杆菌病二联灭活疫苗的效力检验中,需要进行动物攻毒保护试验。传统方法使用的是2~8℃保存的新鲜菌液对试验动物进行攻毒。本研究中使用的是低温保存的冻干菌液,并对冻干保存的菌数进行了测定和优化。结果表明,冻干保存的菌液能达到新鲜菌液同等的检验结果。同时,对冻干菌液保存期进行试验验证,发现细菌存活状态稳定。因此,在猪丹毒、多杀性巴氏杆菌病二联灭活疫苗效力检验中,可将新鲜的攻毒菌液冻干保存,用于攻毒保护试验,以避免每次繁重的新鲜菌液前期准备工作,并克服活菌数衰减所造成的检验结果不准确等问题。

关键词：猪丹毒杆菌猪多杀性巴氏杆菌冻干菌液效力检验

Revealing the effect of preparation parameters on zeolite adsorption performance for low and medium concentrations of ammonium

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Journal of Environmental Sciences 2019年第11期31卷 177-188页

作者： Wenyan He Hui Gong Kuo fang fei peng Kaijun Wang State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084China School of Water Resources & Environment China University of Geosciences Beijing 100083 China

The effect of preparation parameters on the performance of zeolite for ammonium (20-300 mg N/L) adsorption from simulated wastewater is *** was found that the ratios of Na2O/SiO2 and Si/Al had a more important influence than crystallization time on zeolite adsorption *** low Na2O/SiO2 ratios were beneficial for fabrication of zeolites with high proportions of micropore area and volume,which led to the surface adsorption mechanism being dominated by surface free energy and pore ***,with decreasing Si/Al ratios,the effect of ion-exchange was more prominent due to the high negative surface potential of *** addition,the concentration of weak acid sites on the zeolites was increased with lower ratios of Na2O/SiO2 and Si/Al,which may promote ammonium ***,the most effective zeolite for ammonium removal,which was fabricated at Na2O/SiO2 =1.375,Si/Al =4 and crystallization time of 48 hr,exhibited the cooperative effects of adsorption,ion-exchange and a large amount of weak acid *** maximum ammonium adsorption capacity (35.06 t 0.98 mg/g) and the removal efficiency (94.44%± 4.00%) were obtained at the dosage of 4.0 g/L zeolite NaX at ammonium concentrations of 300 mg N/L and 20 mg N/L,*** Freundlich isotherm and pseudo-first-order kinetics models provided excellent fitting for the ammonium adsorption *** addition,zeolite NaX showed about 1.23-3.2 times the ammonium adsorption capacity of *** stable and efficient reusability of zeolite NaX after five regeneration cycles demonstrated that this adsorbent has considerable potential for practical industrial applications.

关键词： Zeolite synthesis Ammonium nitrogen removal Ion exchange Performance optimization

Gut-brain axis as a bridge in obesity and depression:Mechanistic exploration and therapeutic prospects

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World Journal of Psychiatry 2025年第1期15卷 12-20页

作者： Rui-Ying fang Xiao-Rui Pan Xin-Xing Zeng Zheng-Zheng Li Bo-Fan Chen Hai-Min Zeng Jie peng The Second Clinical Medical College The Second Affiliated HospitalJiangxi Medical CollegeNanchang UniversityNanchang 330006Jiangxi ProvinceChina

A recent study by Wang et al,published in the World Journal of Psychiatry,provided preventative and therapeutic strategies for the comorbidity of obesity and *** gut-brain axis,which acts as a two-way communication system between the gastrointestinal tract and the central nervous system,plays a pivotal role in the pathogenesis of these *** suggests that metabolic byproducts,such as short-chain fatty acids,lipopolysaccharide and bile acids,which are generated by the gut microbiota,along with neurotransmitters and inflammatory mediators within the gut-brain axis,modulate the host's metabolic processes,neuronal regulation,and immune responses through diverse *** interaction between obesity and depression via the gut-brain axis involves disruptions in the gut microbiota balance,inflammatory immune responses,and alterations in the neuroendocrine *** the gut-brain axis,for example,through a ketogenic diet,the use of probiotics,and the supplementation of antioxidants,offers new remedial approaches for obesity and *** research that explores the mechanisms of the gut-brain axis is needed to provide more evidence for clinical treatment.

关键词： Gut-brain axis Obesity Depression Gut microbiota Mechanism