Mathematical and Computer Modelling最新文献_第10页

Moisture content prediction of porcine meat by bioelectrical impedance spectroscopy 用生物电阻抗谱法预测猪肉水分含量

Mathematical and Computer Modelling Pub Date : 2013-08-01 DOI: 10.1016/j.mcm.2012.12.020

Yang Yang , Zhong-Yi Wang , Qiang Ding , Lan Huang , Cheng Wang , Da-Zhou Zhu

{"title":"Moisture content prediction of porcine meat by bioelectrical impedance spectroscopy","authors":"Yang Yang , Zhong-Yi Wang , Qiang Ding , Lan Huang , Cheng Wang , Da-Zhou Zhu","doi":"10.1016/j.mcm.2012.12.020","DOIUrl":"10.1016/j.mcm.2012.12.020","url":null,"abstract":"<div><p>Moisture content is one of the most important elements influencing the quality of porcine meat. However, in recent years, illegally water-injected meat has been discovered repeatedly in the Chinese market. It is well known that high moisture content allows microbes to multiply easily, which can affect people’s health and causes major problems for the meat storage and processing industry. This research developed a rapid, low-cost method for measuring moisture content in porcine meat using bioelectrical impedance spectroscopy. Forty-four pieces of porcine <em>longissimus dorsi</em> muscle (LDM) were evaluated with a four-terminal electrode portable bioimpedance spectroscopy system. The samples were divided into a training set and a test set. Thirty samples were selected to be the training set to establish the model for the experiment. The results show good correlation (coefficient of determination <span><math><msup><mrow><mi>R</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>=</mo><mn>0.802</mn></math></span>) between the impedance parameters and the moisture content value determined by standard chemical methods. Based on the model established using a linear prediction equation, we calculated the moisture content for the test set samples. Promising results were obtained for moisture content prediction of the samples, with <span><math><msup><mrow><mi>R</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>=</mo><mn>0.879</mn></math></span> for the test set. The method is thus shown to be feasible for moisture content prediction in porcine LDM, and is potentially useful for assessment and discrimination of meat quality.</p></div>","PeriodicalId":49872,"journal":{"name":"Mathematical and Computer Modelling","volume":"58 3","pages":"Pages 819-825"},"PeriodicalIF":0.0,"publicationDate":"2013-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mcm.2012.12.020","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76901211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 24

Modeling of water and nitrogen utilization of layered soil profiles under a wheat–maize cropping system 小麦-玉米种植制度下层状土壤剖面水氮利用模拟

Mathematical and Computer Modelling Pub Date : 2013-08-01 DOI: 10.1016/j.mcm.2011.10.060

Y. He , K.L. Hu , H. Wang , Y.F. Huang , D.L. Chen , B.G. Li , Y. Li

{"title":"Modeling of water and nitrogen utilization of layered soil profiles under a wheat–maize cropping system","authors":"Y. He , K.L. Hu , H. Wang , Y.F. Huang , D.L. Chen , B.G. Li , Y. Li","doi":"10.1016/j.mcm.2011.10.060","DOIUrl":"10.1016/j.mcm.2011.10.060","url":null,"abstract":"<div><p>Understanding water and nutrient utilization in agricultural layered soil is very important for the improvement of agricultural management and protection of the environment. The objective of this paper is to determine the effect of layered soil profiles on crop yield and water and fertilizer nitrogen (N) utilization. Firstly a water and nitrogen management model (WNMM) was calibrated and validated under a wheat–maize cropping system in an alluvial plain using published data of two soil profiles (named A and B). The results showed that the model can be used to simulate the water movement and N transport, as well as crop growth in the study area. Then, another three very different soil profiles (named C, D and E) near to profiles A and B were studied. The profile C had a silt loam–clay profile; the profile D had a silty loam–clay–silt profile and the profile E had a clay–silty loam–silt profile. The soil hydraulic parameters of these profiles were obtained by pedo-transfer functions using measured soil properties. Given the same initial conditions and field management practices, the WNMM was then used to simulate water and Nitrogen balance and crop yield for the three profiles. Simulated results showed that the profiles (C, D and E) have similar water and fertilizer N use efficiencies (WUE, FNUE), while the crop yields of profiles C and D were higher than that of the profile E. Compared with profiles D and E, the profile C has least water drainage (127 mm) and total N loss (117 kg N ha<sup>−1</sup>). We concluded that layering of soil profiles has a strong effect on water and fertilizer N utilization and crop yield. Such an effect of layered property of soil profiles, therefore, needs to be taken into account in precision agriculture related research.</p></div>","PeriodicalId":49872,"journal":{"name":"Mathematical and Computer Modelling","volume":"58 3","pages":"Pages 596-605"},"PeriodicalIF":0.0,"publicationDate":"2013-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mcm.2011.10.060","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72880037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 19

Real-time control of 3D virtual human motion using a depth-sensing camera for agricultural machinery training 基于深度感测相机的三维虚拟人体运动实时控制在农业机械培训中的应用

Mathematical and Computer Modelling Pub Date : 2013-08-01 DOI: 10.1016/j.mcm.2012.12.026

Chengfeng Wang , Qin Ma , Dehai Zhu , Hong Chen , Zhoutuo Yang

{"title":"Real-time control of 3D virtual human motion using a depth-sensing camera for agricultural machinery training","authors":"Chengfeng Wang , Qin Ma , Dehai Zhu , Hong Chen , Zhoutuo Yang","doi":"10.1016/j.mcm.2012.12.026","DOIUrl":"10.1016/j.mcm.2012.12.026","url":null,"abstract":"<div><p>To recreate human movements in a virtual environment in real time, we propose a new method for real-time tracking of 3D virtual full-body motion using a depth-sensing camera. The method uses natural interaction and a non-contact mode. The 3D virtual environment was constructed using a 3D graphics engine and human joint data were calculated using images acquired from a Prime Sense depth-sensing camera. Then skeletal data for the human model in a skinned mesh animation were separated by improving the mesh modules using a 3D graphics engine. Finally, motion data from the depth sensor were combined with joint data for the human model to yield full-body control of a virtual human (VH). Experimental results show that the proposed method can drive VH full-body movements in real time based on motion-sensing data. The method was applied in virtual driving training for agricultural machinery. Trainees can become familiar with the basic operations required for driving agricultural machinery using full-body motion instead of a mouse and keyboard. The training system is inexpensive and has high safety and a strong sense of immersion.</p></div>","PeriodicalId":49872,"journal":{"name":"Mathematical and Computer Modelling","volume":"58 3","pages":"Pages 782-789"},"PeriodicalIF":0.0,"publicationDate":"2013-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mcm.2012.12.026","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78798203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12

Development of a whole-feeding and automatic rice thresher for single plant 单株全喂全自动稻米脱粒机的研制

Mathematical and Computer Modelling Pub Date : 2013-08-01 DOI: 10.1016/j.mcm.2011.10.033

Chenglong Huang, Lingfeng Duan, Qian Liu, Wanneng Yang

{"title":"Development of a whole-feeding and automatic rice thresher for single plant","authors":"Chenglong Huang, Lingfeng Duan, Qian Liu, Wanneng Yang","doi":"10.1016/j.mcm.2011.10.033","DOIUrl":"10.1016/j.mcm.2011.10.033","url":null,"abstract":"<div><p>Threshing is an essential pretreatment in rice yield-related traits evaluation and rice thresher is an important study of agricultural machinery automation. However, traditional threshers aim at threshing filled grains with simple function, which are inapplicable to high-precision and automatic yield-related traits evaluation of rice. And the conventional threshing method for the traits evaluation is still manual. To improve it, we developed a whole-feeding and automatic rice thresher for single plant. The thresher adopted a hierarchical multi-roller rolling method to thresh filled and unfilled grains respectively. A fish scale sieve plate was designed to separate the grains from the straw and the whole system was controlled by Programmable Logic Controller (PLC) automatically. To evaluate the threshing system, two batches of rice plants were tested, and the results showed that the thresher had the advantages of high precision, low breakage and no residue. Thus, the thresher provides strong support for high-precision and automatic yield-related traits evaluation of rice.</p></div>","PeriodicalId":49872,"journal":{"name":"Mathematical and Computer Modelling","volume":"58 3","pages":"Pages 684-690"},"PeriodicalIF":0.0,"publicationDate":"2013-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mcm.2011.10.033","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80901024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Mathematical and Computer Modeling in Agriculture 农业中的数学和计算机建模

Mathematical and Computer Modelling Pub Date : 2013-08-01 DOI: 10.1016/j.mcm.2013.06.002

Daoliang Li (Chair of CCTA2013)

引用次数: 0

Visualization of synchronous propagation of plant electrical signals using an optical recording method 利用光学记录方法可视化植物电信号的同步传播

Mathematical and Computer Modelling Pub Date : 2013-08-01 DOI: 10.1016/j.mcm.2011.10.036

Yang Qin , Lan Huang , An Liu , Dong-jie Zhao , Zhong-yi Wang , Yi-min Liu , Tong-lin Mao

引用次数: 7

Simulation of the flow characteristics of a drip irrigation emitter with large eddy methods 用大涡法模拟滴灌灌水器的流动特性

Mathematical and Computer Modelling Pub Date : 2013-08-01 DOI: 10.1016/j.mcm.2011.10.074

Dan Wu , Yun-kai Li , Hai-sheng Liu , Pei-ling Yang , Hao-su Sun , Yao-ze Liu

{"title":"Simulation of the flow characteristics of a drip irrigation emitter with large eddy methods","authors":"Dan Wu , Yun-kai Li , Hai-sheng Liu , Pei-ling Yang , Hao-su Sun , Yao-ze Liu","doi":"10.1016/j.mcm.2011.10.074","DOIUrl":"10.1016/j.mcm.2011.10.074","url":null,"abstract":"<div><p>Realizing the internal flow visualization inside the drip irrigation emitter is the basis of optimizing the labyrinth path structure and promoting its anti-clogging capability. The Computational Fluid Dynamics (CFD) method has become an effective approach to research the water movement in the labyrinth path of the drip irrigation emitter. In this paper, the standard k-<span><math><mi>ε</mi></math></span> model and the Large Eddy Simulation method (LES) were applied to analyze the flow characteristic in the drip irrigation emitter. The results showed that the LES model was more effective to simulate the flow characteristics in the flow path of drip irrigation emitters. Based on this model, the energy dissipation mechanism was explained with the velocity and pressure values from local regions to the whole flow path, and the study of the flow path anti-clogging performance was carried out by way of analyzing the velocity distribution characteristics in different cross sections of the same structure unit.</p></div>","PeriodicalId":49872,"journal":{"name":"Mathematical and Computer Modelling","volume":"58 3","pages":"Pages 497-506"},"PeriodicalIF":0.0,"publicationDate":"2013-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mcm.2011.10.074","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84966904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 29

Simulation of the operation of a fertilizer spreader based on an outer groove wheel using a discrete element method 基于外槽轮的撒肥机运行的离散元模拟

Mathematical and Computer Modelling Pub Date : 2013-08-01 DOI: 10.1016/j.mcm.2012.12.017

Hao Lv , Jianqun Yu , Hong Fu

{"title":"Simulation of the operation of a fertilizer spreader based on an outer groove wheel using a discrete element method","authors":"Hao Lv , Jianqun Yu , Hong Fu","doi":"10.1016/j.mcm.2012.12.017","DOIUrl":"10.1016/j.mcm.2012.12.017","url":null,"abstract":"<div><p>Fertilizer spreaders based on an outer groove wheel (OGWFS) are widely used in northern China. Proper design of such machines is essential. However, experience and experimental methods are mostly used in their design so it is difficult to achieve an optimal design. We propose an approach for research and optimized design of a fertilizer spreader in the case of an OGWFS and granular compound fertilizer. We first build a 3D discrete element method (DEM) model using a 3D CAD model of the fertilizer spreader and construct a fertilizer particle analysis model using spherical particles. A linear viscoelastic model calculates the contact force between particles and between particles and the fertilizer spreader. We analyze the working process and fertilizer amount using self-developed 3D DEM software. Finally, by changing the CAD model of the machine, we analyzed fertilizer spreaders of different structures and sizes. The DEM simulation results were compared with platform test results. The preliminary results indicate the validity and effectiveness of DEM analysis.</p></div>","PeriodicalId":49872,"journal":{"name":"Mathematical and Computer Modelling","volume":"58 3","pages":"Pages 842-851"},"PeriodicalIF":0.0,"publicationDate":"2013-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mcm.2012.12.017","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81872397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 28

Mathematical modeling for active and dynamic diagnosis of crop diseases based on Bayesian networks and incremental learning 基于贝叶斯网络和增量学习的作物病害主动动态诊断数学建模

Mathematical and Computer Modelling Pub Date : 2013-08-01 DOI: 10.1016/j.mcm.2011.10.072

Yungang Zhu , Dayou Liu , Guifen Chen , Haiyang Jia , Helong Yu

{"title":"Mathematical modeling for active and dynamic diagnosis of crop diseases based on Bayesian networks and incremental learning","authors":"Yungang Zhu , Dayou Liu , Guifen Chen , Haiyang Jia , Helong Yu","doi":"10.1016/j.mcm.2011.10.072","DOIUrl":"10.1016/j.mcm.2011.10.072","url":null,"abstract":"<div><p>To achieve rapid and precise diagnosis of crop diseases, an active and dynamic method of diagnosis of crop diseases is needed and such a method is proposed in this paper. This method adopts Bayesian networks to represent the relationships among the symptoms and crop diseases. This method has two main differences from the existing diagnosis methods. First, it does not use all the symptoms in the diagnosis, but purposively selects a subset of symptoms which are the most relevant to diagnosis; the active symptom selection is based on the concept of a Markov blanket in a Bayesian network. Second, a specific incremental learning algorithm for Bayesian networks is also proposed to make the diagnosis model update dynamically over time in order to adapt to temporal changes of environment. Furthermore, the diagnosis results can be calculated without inference in Bayesian networks, so the method has low time complexity. Theoretical analysis and experimental results demonstrate that the proposed method can significantly enhance the performance of crop disease diagnosis.</p></div>","PeriodicalId":49872,"journal":{"name":"Mathematical and Computer Modelling","volume":"58 3","pages":"Pages 514-523"},"PeriodicalIF":0.0,"publicationDate":"2013-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mcm.2011.10.072","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76399425","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 29

Extraction of individual tree crowns from airborne LiDAR data in human settlements 从人类住区的机载激光雷达数据中提取单个树冠

Mathematical and Computer Modelling Pub Date : 2013-08-01 DOI: 10.1016/j.mcm.2011.10.071

Jiping Liu, Jing Shen, Rong Zhao, Shenghua Xu

引用次数: 43