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Superattracting cycles for some Newton type iterative methods

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Science China Mathematics 2011年第3期54卷 539-544页

作者： AMAT Sergio BUSQUIER sonia NAVARRO Emilie PLAZA Sergio Departamento de Matemtica Aplicada y Estadistica Universidad Politécnica de Cartagena Ecole Généraliste d'Ingénieurs de Marseille (EGIM) Departamento de Matemticas Facultad de Ciencias Universidad de Santiago de Chile

The paper is devoted to the analysis of certain dynamical properties of a family of iterative Newton type methods used to find roots of non-linear equations. We present a procedure for constructing polynomials in such a way that superattracting cycles of any prescribed length occur when these iterative methods are applied. This paper completes the study begun in Amat, Bermúclez, Busquier, et al., (2009).

关键词： iterative methods (super)attracting cycles dynamics

Contribution of Women Empowerment to Human Development in Rwanda:takingwomen Empowerment Influence on Child Health Asa Case

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Contribution of Women Empowerment to Human Development in Rw...

作者： Tona sonia 厦门大学

学位级别：硕士

妇女赋权仍然是全球人类发展中的一个新问题,因为妇女在发展的许多方面都处于边缘地位。在这项研究中,分析了卢旺达妇女赋权的状况,特别强调了在1994年种族灭绝之后政府采取的措施和政策,以及面对的挑战,例如缺乏获得资金,教育和卫生的... 详细信息

妇女赋权仍然是全球人类发展中的一个新问题,因为妇女在发展的许多方面都处于边缘地位。在这项研究中,分析了卢旺达妇女赋权的状况,特别强调了在1994年种族灭绝之后政府采取的措施和政策,以及面对的挑战,例如缺乏获得资金,教育和卫生的机会,将妇女纳入发展进程。卢旺达通过国家性别平权机制,在增强妇女权能方面取得了值得称赞的成就,主要表现在政治参与,教育,金融和信贷,农业,劳动力参与和卫生等方面。根据联合国妇女署公布的2019年统计数据,卢旺达是全球女性议员人数最多的领先国家。可以说,一个曾经因1994年针对图西族的种族灭绝相关的黑暗过去而闻名世界的国家,已经能够将其形象重新塑造为全球性别平等冠军的形象。此外,在这项研究中,还论证了赋予妇女权力如何改善儿童健康,从而改善人类发展。根据2018年世界银行的报告,估计卢旺达有38%的儿童发育不良。卢旺达儿童营养不良的主要原因包括:粮食不安全,缺乏知识,性别不平衡和贫困。为了检验该项结论,使用Probit模型通过使用2014-2015年卢旺达人口人口普查中的数据来检验该结论。研究结果发现,卢旺达的妇女有56%的权能得到了授权,这表明2014-15年度RDHS研究中接受采访的妇女获得了权能。增强妇女权能可以改善儿童健康,但是在卢旺达,不能忽略人口统计学特征和社会人口统计学对儿童健康的影响。

关键词：妇女赋权人类发展儿童健康概率模型

Solute mixing in a permeable non-rectangular channel

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International Journal of Sediment Research 2020年第2期35卷 134-145页

作者： sonia Zebardast Sayyed-Hassan Tabatabaei Fariborz Abbasi Manuchehr Heidarpour Department of Water Engineering Faculty of AgricultureShahrekord University Agricultural Engineering Research Institute (AERI) Agricultural ResearchEducation and Extension Organization (AREEO) 3. Department of Water EngineeringCollege of AgricultureIsfahan University of Technology

Understanding diffusion and solute transport,is regarded as a main activity in environmental management,sustainable development and sedimentation processes because of their role in diffusion of *** current paper presents an experimental study which was done in a parabolic channel with permeable and impermeable bed conditions in order to estimate the transverse mixing coefficient(TMC) and the maximum solute mixing length(SML) for different channel bed roughness coefficients and *** cross section of the channel was 0.5 m wide and 0.3 m deep with a parabolic shape(*** to furrow irrigation).Three levels of bed roughness coefficient of 0.02,0.04,and 0.06,and three discharges of 5,10,and 15 L/s were *** infiltration channel was applied at a low level and medium level as well as a case without *** the current experiments,sodium chloride was used as a soluble tracer and was injected into the water at mid depth in the upstream cross *** tracer concentration profile in the water and velocity profile were measured at eight cross sections in the *** results showed that the values of SML ranged between 20 and 46 m in impermeable and permeable beds channel beds *** assessment of usual discharge values,infiltration,and roughness coefficient of a furrow(agricultural field) indicated that the SML of the furrows were less than20 *** the current research,the average dimensionless mixing coefficient was found to be 0.17 in the nonrectangular ***,equations were developed to explain the TMC and SML in a permeable parabolic channel that could be beneficial in prediction of fertilizer transport in furrow irrigatio n.

关键词： Environmental hydraulics Fertigation Furrow irrigation Solute mixing length Transverse mixing coefficient

Effects of geraniin(rambutan rind extract) on blood pressure and metabolic parameters in rats fed high-fat diet

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Journal of Integrative Medicine 2019年第2期17卷 100-106页

作者： sonia Chew Wen Phang Uma Devi Palanisamy Khalid Abdul Kadir School of Medicine and Health Sciences Monash University Malaysia

Objective: A preliminary study showed that geraniin extracted from Nephelium lappaceum L. at 50 mg/kg caused reduction in blood glucose and insulin resistance. The present study serves to further investigate the effects of geraniin at increasing doses between 3.125 and 100 mg/kg in high-fat diet-treated ***: Geraniin(95% purity) was extracted and purified from rambutan rind. Two groups of male Sprague-Dawley rats were fed with 60% high-fat diet and standard rat chow, respectively, for 12 ***-fat diet-treated rats were then administered geraniin at different doses. Body weight, blood pressure and blood glucose readings were measured. At the end of treatment, blood was collected for analysis of glycated haemoglobin A1c(HbA1c), insulin, advanced glycation end-product(AGE) levels, renin, aldosterone and ***: Within the first week of treatment, even the lowest dose of geraniin caused a significant reduction in blood pressure, which was comparable to control diet-treated rats. There were no changes in serum electrolytes, renin or aldosterone. Similarly, there was a significant reduction in serum insulin,insulin resistance and AGE levels at the lowest dose. However, there was no significant decrease in fasting blood glucose or HbA1c. The effects of decreasing insulin, insulin resistance and AGEs were observed only at the lower doses, unlike the results observed for blood pressure ***: Geraniin at lower doses improved blood pressure and other metabolic parameters. Secondary metabolites of geraniin, associated with antihypertensive activity, are relatively different to those involved in inhibiting AGE formation and increasing insulin sensitivity. The secondary metabolites of geraniin may be individually responsible for the bioactivities demonstrated.

关键词： Metabolic syndrome Hypertension Hyperglycemia Insulin resistance Advanced glycation end-product levels Geraniin

Application of Natural Antioxidants from Strawberry Tree(Arbutus unedo L.) and Dog Rose(Rosa canina L.) to Frankfurters Subjected to Refrigerated Storage

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Journal of Integrative Agriculture 2013年第11期12卷 1972-1981页

作者： Mónica Armenteros David Morcuende sonia Ventanas Mario Estévez Animal Production and Food Science University of ExtremaduraAv.de la Universidad s/n

The effect of the addition of natural antioxidants from strawberry tree （Arbutus unedo L.; AU） and dog rose （Rosa canina L.; RC）, in frankfurters elaborated with or without the addition of antioxidant additives （sodium ascorbate and nitrite） was studied. Six different types of experimental frankfurters were prepared depending on the addition of phenolic-rich extracts from RC and AU and the presence （P） or absence （C） of antioxidant additives. Thiobarbituric acid reactive substances （TBARS）-numbers signiifcantly increased during chilled storage of C-frankfurters while additives and fruit phenolics inhibited lipid oxidation in P-frankfurters. The amount of protein carbonyls signiifcantly increased in all treatments except in P-AU frankfurters. The discoloration process that occurred during the chilled storage was reduced by the addition of substances with proven antioxidant activity （P-frankfurters）. Texture characteristics as hardness, springiness, cohesiveness and gumminess also suffered a signiifcant deterioration in C-frankfurters. The use of phenolic fruit extracts in combination with traditional antioxidant additives is a successful strategy to enhance the oxidative stability of frankfurters without modifying their color and texture properties.

关键词： fruit phenolics protein oxidation lipid oxidation nitrite ascorbate

Simultaneous nitrification and autotrophic denitrification in fluidized bed reactors using pyrite and elemental sulfur as electron donors

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Water Science and Engineering 2023年第2期16卷 143-153页

作者： Maria F.Carboni sonia Arriaga Piet N.L.Lens National University of Ireland Galway H91 TK33 GalwayIreland Instituto Potosino de Investigación Científica y Tecnológica 78216 San Luis PotosíMexico

In this study, simultaneous nitrification and autotrophic denitrification (SNAD) with either elemental sulfur or pyrite were investigated in fluidized bed reactors in mesophilic conditions. The reactor performance was evaluated at different ammonium (12-40 mg/L of NH4+-N), nitrate (35-45 mg/L of NO3--N), and dissolved oxygen (DO) (0.1-1.5 mg/L) concentrations, with a hydraulic retention time of 12 h. The pyrite reactor supported the SNAD process with a maximum nitrogen removal efficiency of 139.5 mg/(L·d) when the DO concentration was in the range of 0.8-1.5 mg/L. This range, however, limited the denitrification efficiency of the reactor, which decreased from 90.0% ± 5.3% in phases II-V to 67.9% ± 7.2% in phases VI and VII. Sulfate precipitated as iron sulfate (FeSO4/Fe2(SO4)3) and sodium sulfate (Na2SO4) minerals during the experiment. The sulfur reactor did not respond well to nitrification with a low and unstable ammonium removal efficiency, while denitrification occurred with a nitrate removal efficiency of 97.8%. In the pyrite system, the nitrifying bacterium Nitrosomonas sp. was present, and its relative abundance increased from 0.1% to 1.1%, while the autotrophic denitrifying genera Terrimonas, Ferruginibacter, and Denitratimonas dominated the community. Thiobacillus, Sulfurovum, and Trichlorobacter were the most abundant genera in the sulfur reactor during the entire experiment.

关键词： Pyrite Elemental sulfur Simultaneous nitrification and denitrification Nitrogen removal 16S rRNA

SATURATION EFFECTS FOR CTL MEDIATED CONTROL OF HIV-1 INFECTION： A MATHEMATICAL STUDY

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International Journal of Biomathematics 2013年第3期6卷 33-51页

作者： PRITI KUMAR ROY sonia CHOWDHURY XUE-ZHI LI Centre for Mathematical Biology and EcologyDepartment of Mathematics Jadavpur University Kolkata 700032 India Department of Mathematics Xinyang Normal UniversityXinyang 464000 P. R. China

The relations between the Human Immunodeficiency Virus-1 （HIV-1） and the human immune system are astonishingly multifaceted, where the critical role for cytotoxic T lymphocytes （CTLs） in the suppression of viral replication in HIV-1 infected individuals cannot be ignored. In this research paper, we have proposed a mathematical model incorporating half saturation constant through the CTL mediated killing process and also in that sense, it has been infiltrated in the generation process of CTL through infected cells. To make the model more realistic, a time lag is introduced in the generation term of CTL population. Also an optimal control theory paradigm is used in our mathematical model to suppress the viral production. From our entire analysis, we have found threshold condition of half saturation constant and treatment schedule so that we can handle the situation of Acquired Immunodeficiency Syndrome （AIDS） patients in a better way. Our analysis reveals that, if the half saturation constant is around 47 mm^-3 in the saturation process and the drug therapy is to be used around 76 days, then we can get adequate results for better treatment of a HIV-1 patient. Based on numerical results, we observed that in a highly unstable situation, administration of chemotherapy at a high dose can stabilize the system.

关键词： CD4^+T cells HIV-1 Cytotoxic T-Lymphocyte (CTL) highly active antiretroviral therapy optimal control.

Carbon fibres reinforced *** impedance analysis:a gateway to smartness

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International Journal of Smart and Nano Materials 2020年第4期11卷 417-430页

作者： Philippe Margueres Philippe Olivier Mahamadou Mounkaila sonia Sassi Thierry Camps ICA Universitéde ToulouseToulouseFrance LAAS Universitéde ToulouseToulouseFrance

For more than 7 years,our research work is focussed upon the electrical behavior of carbon fiber reinforced *** carbon/polymeric matrix laminates can be considered as an electri-cally conductive network(*** fibers)embedded in an insulat-ing medium(*** polymeric matrix).Consequently,from an electrical point of view laminated composites have been modelled owing to combinations of electrical resistances(*** themselves and the contact points between the fibers)and capacitances(*** matrix).During their manufacturing,composite material such as thermoset matrix composites for instance,undergo various changes in their physical(including electrical and mechanical)prop-erties and in their geometrical *** fact,in the case of manufacturing processes such as oven curing(vacuum bag),auto-clave curing or heating plate press,beside the chemo-rheologi-cal changes,the laminated parts are the place of a compaction phenomenon inducing changes in fiber volume fraction and *** idea developed in this paper is that since the carbon/polymeric matrix laminate can be considered as an electrical network,it can then be view and used as a sensor for following the material state during the manufacturing process enabling thus defects to be detected and this without any additional sensing material or device.

关键词： Electrical impedancemetry cure monitoring CFRP functionalization SHM

Premature losses of leaf area in response to drought and insect herbivory through a leaf lifespan gradient

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Journal of Forestry Research 2022年第1期33卷 39-50页

作者： sonia Mediavilla Montserrat Martínez-Ortega Santiago Andrés Javier Bobo Alfonso Escudero Departamento de Ecología Facultad de BiologíaUniversidad de Salamanca37071 SalamancaSpain Departamento de Botánica y Fisiología Vegetal Facultad de BiologíaUniversidad de Salamanca37071 SalamancaSpain

Implications of the differences in leaf life span are still subject to debate in the field of *** leaf traits associated with these differences may be decisive for determining the distribution of tree species,this topic is particularly relevant in the context of climate *** study analyzes the effects of the differences in leaf life span on premature losses of leaf area owing to insect herbivory and to abiotic *** of leaf area may be an important determinant of total leaf carbon *** Mediterranean tree species,distributed on four sites with different climates were *** species exhibited strong differences in leaf life span and in leaf traits,especially leaf mass per unit *** leaf area losses were estimated in response to insect herbivory and summer drought over two *** results revealed that,despite having older leaf cohorts with more damage,species with longer leaf duration had lower area lost to herbivores and less damage due to accelerated senescence during the summer *** respect to the predicted increase in water stress,deciduous species are at a disadvantage due to their high premature loss of leaf area and thus loss of photosynthetic capacity.

关键词： Accelerated senescence Insect herbivory Leaf life span Leaf structural reinforcement Summer drought