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Search Results: 1 - 10 of 4311 matches for " Hongwei Mo "
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Magnetotactic Bacteria Algorithm for Function Optimization  [PDF]
Hongwei Mo, Lifang Xu
Journal of Software Engineering and Applications (JSEA) , 2012, DOI: 10.4236/jsea.2012.512B014
Abstract: Magnetotactic bacteria is a kind of polyphyletic group of prokaryotes with the characteristics of magnetotaxis that make them orient and swim along geomagnetic field lines. A magnetotactic bacteria optimization algorithm(MBOA) inspired by the characteristics of magnetotactic bacteria is researched in the paper. Experiment results show that the MBOA is effective in function optimization problems and has good and competitive performance compared with the other classical optimization algorithms.
Performance Research on Magnetotactic Bacteria Optimization Algorithm with the Best Individual-Guided Differential Interaction Energy  [PDF]
Hongwei Mo, Lili Liu, Jiao Zhao
Journal of Computer and Communications (JCC) , 2015, DOI: 10.4236/jcc.2015.35016
Abstract:

Magnetotactic bacteria optimization algorithm (MBOA) is a new optimization algorithm inspired by the characteristics of magnetotactic bacteria, which is a kind of polyphyletic group of prokaryotes with the characteristics of magnetotaxis that make them orient and swim along geomagnetic field lines. The original Magnetotactic Bacteria Optimization Algorithm (MBOA) and several new variants of MBOA mimics the interaction energy between magnetosomes chains to obtain moments for solving problems. In this paper, Magnetotactic Bacteria Optimization Algorithm with the Best Individual-guided Differential Interaction Energy (MBOA-BIDE) is proposed. We improved interaction energy calculation by using the best individual-guided?differential interaction energy formation. We focus on analyzing the performance of different parameters settings. The experiment results show that the proposed algorithm is sensitive to parameters settings on some functions.

Images Analysis of the Vegetation Coverage Changes in Yuyang District of Northern Shaanxi Province in the Recent 30 Years
陕北榆阳区1978年至2005年植被覆盖率变化分析

MO Hongwei,REN Zhiyuan,
莫宏伟
,任志远

资源科学 , 2009,
Abstract: Based on the remote sensing images, the digital elevation model (DEM), and other information of Yuyang District, suitable models, the theory of geographic information images, as well as RS and GIS are used to, analyze temporal-spatial changes of the vegetation coverage in Yuyang District from 1978 to 2005. It is concluded that in the recent 30 years, the proportion of the vegetation coverage in Yuyang District has gone up from 3.22% to 10.35%- about 7.13% total increase and the annual average growth rate of 0.26%, while that in loess hilly-gully region has increased from 3.74% to 14.17% and that in wind drift sand region has increased from 3.02% to 8.86%. The proportions of the vegetation coverage in all the different slops of Yuyang District have increased in the research period. The steeper the slops are, the faster the vegetation coverage has increased between 1989 and 2005. The vegetation coverage and its increasing speed in loess hilly-gully region are higher than those in wind drift sand region in the research period. The increasing velocity of vegetation coverage has been similar between 1978~1989 and 1989~2005 in the loess hilly-gully region, while that in the wind drift sand region between 1978 and 1989 has been about 1.77 times more than between1989 and 2005. Among the urban, the suburban and the outer suburban areas of Yuyang District, the vegetation coverage in urban areas has been the highest and that in the outer suburb the lowest from 1978 to 2005. The increasing velocity of the vegetation coverage in the urban areas has been the fastest while that in the outer suburb has been the slowest between1978 and1989, but the status has reversed between1989 and 2005. Plant growth and vegetation development can be affected by climate factors, topography, soil conditions and land-use types. Natural and non-natural disturbances, such as global climate changes, deforestation, afforestation and other human activities can also impact vegetation development. However, the change of vegetation coverage can be mainly attributed to human activities in a short period.
Study on the Existence of Sign-Changing Solutions of Case Theory Based a Class of Differential Equations Boundary-Value Problems  [PDF]
Hongwei Ji
Advances in Pure Mathematics (APM) , 2017, DOI: 10.4236/apm.2017.712042
Abstract: By using the fixed point theorem under the case structure, we study the existence of sign-changing solutions of A class of second-order differential equations three-point boundary-value problems, and a positive solution and a negative solution are obtained respectively, so as to popularize and improve some results that have been known.
Mixing events between the crust- and mantle-derived magmas in eastern kunlun: Evidence from zircon SHRIMP II chronology
Chengdong Liu,Xuanxue Mo,Zhaohua Luo,Xuehui Yu,Hongwei Chen,Shuwei Li,Xin Zhao
Chinese Science Bulletin , 2004, DOI: 10.1007/BF02889756
Abstract: Various shaped mafic microgranular enclaves (MMEs) together with several mafic massifs are developed within the Yuegelu granitoid pluton in the eastern part of the Eastern Kunlun. On the basis of detailed field geological surveying and of the results of the petrological and geochemical studies it is suggested that there must be some genetic relationship among the granodiorite host, the MMEs and the hornblende (Hb)-gabbro massifs. Magmatic zircon grains are extracted from samples of granodiorite host rock, Hb-gabbro and the MMEs for U-Pb dating. The U-Pb ages are determined by using SHRIMP II technique, which yields the ages of 242 ± 6 Ma, 239 ± 6 Ma and 241 ± 5 Ma, respectively. The overall correspondence in the U-Pb dating results of them excludes the possibility that the MMEs in the granitoids are solid refractory relics from the source region or that they are xenoliths from the wall rocks. It can also rule out the possibility of a later emplacement of basic magma after the solidification of the granitoids. This dating result indicates that they are the products of magma mixing in early-mid Triassic epoch. Among them the granitoid host is chemically akin to the acidic end member during the magma mixing process, the Hb-gabbro is akin to the basic ones while the MMEs are the incompletely mixed basic magma clots trapped in the acidic magma. Combined with the results from other researches on this pluton it is reasonable to consider that in the mid-Triassic the Eastern Kunlun granitoid belt had undergone a process of magma mixing between the mantle-derived basic magma and the crustal acidic magma which indicates that the injection of mantle materials and energy into the crust and the reactions between them played an important role in the formation of the granitoid rocks.
Quantitative analysis of sialic acids in Chinese conventional foods by HPLC-FLD  [PDF]
Hongwei Li, Xingdan Fan
Open Journal of Preventive Medicine (OJPM) , 2014, DOI: 10.4236/ojpm.2014.42009
Abstract:

Background: Sialic acids are a family of ninecarbon sugar compounds with carboxylic acyl derivatives. It exists in bacteria, fish, mammals and other living organisms, participates in and regulates many important life events, such as cell recognition, membrane flow, endocytosis and so on. Sialic acid is usually located in the outermost layer of the sugar part of the cell membrane and the key positions of secreted glycoconjugates (glycolipids, glycoprotein and lipopolysaccharide). Sialic acid (Sia) is an important material foundation for variety of the structure and founction of glycoconjugates. Sia has been known as nearly 50 members, including N-acetylneuraminic acid (Neu5Ac), N-glycoulylneuraminic acid (Neu5Gc) and deaminoneuraminic acid (KDN) as its core monomer. The rest of the sialic acids are derived from these three monomers. The contents of Sia in Chinese food products are unknown. Objective: To determine the contents of Sia in raw and cooked red meat, seafood, poultry and so on. Design: The following food products were purchased from a Chinese supermarket: pork, beef, lamb, salmon, cod, tuna, cow milk, cheese, butter, duck, chicken and chicken eggs. Human milk was collected from Xiamen Maternity and Child Health Care Hospital (Xiamen, China). All tissues were homogenized and hydrolyzed with 0.05 M, 0.1 M and 0.2 M TFA for 150 min at 80°C in dark, respectively. The concentrations of Neu5Ac, Neu5Gc and KDN were determined by using HPLC with fluorescence detector. Results: The contents of total Sia (μg/g tissue or μg/mL liquid sample) in Chinese raw meat were highest in lamb (269.60), followed by pork (254.88), duck (200.63), chicken (162.86) and beef (88.03). The percentages of Neu5Gc were 36.08%, 26.48%, 0%, 0% and 28.40%, respectively. Cod contained higher levels of Sia (171.63) than salmon (104.43) and tuna (77.98). Only Neu5Ac was 50 found in detected aquatic product. Egg yolk contained the highest level of Sia (682.04), and a higher level of Sia (390.67) was found in the egg white. Also our result showed that human milk contained extremely high level of Sia (602.55). Neu5Ac was the predominant form of Sia in all

Research on Control Method of Inverters for Large-scale Grid Connected Photovoltaic Power System  [PDF]
Zhuo Zhang, Hongwei Li
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B284
Abstract:

A grid-connected inverter controlling method to analyze dynamic process of large-scale and grid-connected photovoltaic power station is proposed. The reference values of control variables are composed of maximum power which is the output of the photovoltaic array of the photovoltaic power plant, and power factor specified by dispatching, the control strategy of dynamic feedback linearization is adopted. Nonlinear decoupling controller is designed for realizing decoupling control of active and reactive power. The cascade PI regulation is proposed to avoid inaccurate parameter estimation which generates the system static error. Simulation is carried out based on the simplified power system with large-scale photovoltaic plant modelling, and the power factor, solar radiation strength, and bus fault are considered for the further research. It’s demonstrated that the parameter adjustment of PI controller is simple and convenient, dynamic response of system is transient, and the stability of the inverter control is verified.

A New Filled Function with One Parameter to Solve Global Optimization  [PDF]
Hongwei Lin, Huirong Li
Open Journal of Optimization (OJOp) , 2015, DOI: 10.4236/ojop.2015.41002
Abstract: In this paper, a new filled function with only one parameter is proposed. The main advantages of the new filled function are that it not only can be analyzed easily, but also can be approximated uniformly by a continuously differentiable function. Thus, a minimizer of the proposed filled function can be obtained easily by using a local optimization algorithm. The obtained minimizer is taken as the initial point to minimize the objective function and a better minimizer will be found. By repeating the above processes, we will find a global minimizer at last. The results of numerical experiments show that the new proposed filled function method is effective.
Distribution and Pollution Assessment of Heavy Metals in Beidaihe Near-Shore Marine Sediments  [PDF]
Hongwei Liu, Zhen Ma
Journal of Materials Science and Chemical Engineering (MSCE) , 2015, DOI: 10.4236/msce.2015.312001
Abstract:

The concentrations of heavy metals, Cd, Hg, Pb, Cu and As in marine sediments from 138 sites located in the Beidaihe near-shore area of Bohai bay, were analyzed to find out the distribution characteristics of these heavy metals. Potential Ecological Risk index were adopted to assess the heavy metals contamination, and the assessment results indicated that the content of heavy metals in this area is in a low to moderate level, while high values were found in the southwest and northeast region, and the value in the middle region is comparatively low. The high pollution hazard sites were close to the Renzaohe estuary and Shihe estuary and the high risk is mainly led by Hg.

Air Compressor Control System for Energy Saving in Locomotive Service Plant  [PDF]
Wenyu Mo
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2009, DOI: 10.4236/jemaa.2009.12018
Abstract: The actuality and disadvantages of traditional high power asynchronism motor drive air compressor in locomotive ser-vice plant are discussed. In order to reduce the energy consumption and obtain safe running, a variable frequency con-trol method to the motor is supplied. A PLC with touch screen is used for monitoring the status of the compressor and its control system. It also presents energy consumption analysis caused by the variable frequency control method in a locomotive service plant.
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