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动物学报 2008年第1期54卷 136-143页

作者： Prashant k.DEEPAk uttam k.sarkar Raje S.NEGI Samir k PAUL National Bureau of Fish Genetic Resources Canal Ring RoadPO-Dilkusha Lucknow-226002

为了获得印度北部赣达(Ganga)盆地河流中野生卡特拉鲃种群的年龄结构和重要生长参数,对该鱼的年龄和生长进行了研究。鳞片取自商业捕捞和实验室饲养的样品。根据研究分析,该鱼最大年龄可达8龄;巴吉拉蒂河(Bhagirathi R.)的种群平均体长... 详细信息

为了获得印度北部赣达(Ganga)盆地河流中野生卡特拉鲃种群的年龄结构和重要生长参数,对该鱼的年龄和生长进行了研究。鳞片取自商业捕捞和实验室饲养的样品。根据研究分析,该鱼最大年龄可达8龄;巴吉拉蒂河(Bhagirathi R.)的种群平均体长为521·51 mm,退算体长为288·9 -1132·3 mm;旁遮普邦(Punjab)Satluj河种群平均体长为641·6 mm,退算体长为335·4 -1096·08 mm。2龄时,种群线性生长率(Cl)和体重增加率(Cw)表现出迅速下降的趋势。其它生长参数值(Clt)也呈现快速下降。退算体长差异(ANOVA)分析显示,生活在赣达盆地不同流域中的种群, 1+-4+龄组的长度差异较明显(P<0·05) ,高龄组(5+-8+)差异不显著。根据本项研究结果,提出了对印度北部赣达盆地相关河流中生活的野生卡特拉鲃种群资源持续利用的对策。

关键词：野生卡特拉鲃年龄和生长保护和持续利赣达盆地印度

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Mathematical model of zika virus dynamics with vector control and sensitivity analysis

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Infectious Disease Modelling 2020年第1期5卷 23-41页

作者： Sudhanshu kumar Biswas uttam Ghosh Susmita sarkar Department of Mathematics Sripat Singh CollegeMurshidabadWest BengalIndia Department of Applied Mathematics University of CalcuttaKolkataIndia

In this paper,we have developed and analyzed a deterministic Zika model considering both vector and sexual transmission route with the effect of human awareness and vector control in the absence of disease induce *** formulate the model,we assume that the Zika virus is being first transmitted to human by mosquito bite,and then it is being transmitted to his or her sexual *** system contains at most three equilibrium points among them one is the disease free and other two are endemic equilibrium points,exists under certain *** theoretical analysis shows that the diseases-free equilibrium is locally and globally asymptotically stable if the basic reproduction number is less than *** we have established that endemic equilibrium point which is locally asymptotically stable if the basic reproduction number is greater than *** system exhibits backward bifurcation when the transmission probability per biting of susceptible mosquito with infected humans crosses the critical *** estimate the model parameters and validate the model by fitting the model with the reported Zika infected human data from 1 to 36 week of 2016 Zika outbreak in ***,using the normalised forward sensitivity index method we have established that the model parameter mosquito biting rate,recruitment rate of mosquito,transmission probability per biting of Susceptible(infected)humans with infected(susceptible)mosquito,rate of awareness in host population,recovery rates of infected human are most sensitive parameters of the considered Zika ***,some conclusions are given to control the spreading of the Zika disease.

关键词： Zika virus Vector transmission Sexual transmission Basic reproduction number Stability analysis Backward bifurcation Sensitivity analysis

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Fractional Weierstrass Function by Application of Jumarie Fractional Trigonometric Functions and Its Analysis

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Advances in Pure Mathematics 2015年第12期5卷 717-732页

作者： uttam Ghosh Susmita sarkar Shantanu Das Department of Mathematics Nabadwip Vidyasagar CollegeNabadwipIndia Department of Applied Mathematics University of CalcuttaKolkataIndia Reactor Control Systems Design Section E&I GroupBARCMumbaiIndia

The classical example of no-where differentiable but everywhere continuous function is Weierstrass function. In this paper we have defined fractional order Weierstrass function in terms of Jumarie fractional trigonometric functions. The H?lder exponent and Box dimension of this new function have been evaluated here. It has been established that the values of H?lder exponent and Box dimension of this fractional order Weierstrass function are the same as in the original Weierstrass function. This new development in generalizing the classical Weierstrass function by use of fractional trigonometric function analysis and fractional derivative of fractional Weierstrass function by Jumarie fractional derivative, establishes that roughness indices are invariant to this generalization.

关键词： Holder Exponent Fractional Weierstrass Function Box Dimension Jumarie Fractional Derivative Jumarie Fractional Trigonometric Function

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Sources of Nitrogen in Combination with Systems of Irrigation Influence the Productivity of Modern Rice(Oryza sativa L.)Cultivars during Dry Season in Sub-Tropical Environment

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Phyton-International Journal of Experimental Botany 2022年第8期91卷 1687-1708页

作者： uttam kumer Sarker Md.Romij Uddin Ahmed khairul Hasan Md.Abdur Rahman sarkar Md.Abdus Salam Md.Alamgir Hossain Eldessoky S.Dessoky Ismail A.Ismail Department of Agronomy Bangladesh Agricultural UniversityMymensingh2202Bangladesh Department of Crop Botany Bangladesh Agricultural UniversityMymensingh2202Bangladesh Department of Biology College of ScienceTaif UniversityTaif21944Saudi Arabia

In irrigated agricultural systems,nitrogen(N)and water are the vital resources for sustainability of the crop production in the modern era of climate *** current study aimed to assess the impact of water and N management on the productivity of irrigated rice *** the context,a field observation was done at the research farm of Bangladesh Agricultural University,Mymensingh,during dry seasons in consecutive two years(2018–2019 and 2019–2020).The experiments were set up following split-plot design assigning water management in the main plots,nitrogen management in the sub-plots,and the cultivars were approved in the split-split plot with three *** two years observation,it was revealed that rice cultivar Binadhan-8 gave the maximum value of leaf area index,number effective tillers hill-1 and grains panicle-1 which lead to the higher grain yield(GY).Substantial relationships were observed among the concentration of N,growth,total dry matter(TDM)and N content,N uptake,N utilization effectiveness,and ***,with little exception,the Combined effect of water and N,cultivars and water management were varied significantly for all ***,the results of the current study concluded that application of irrigation at 8 days after the disappearance of ponded water and source of 105 kg N ha-1 from PU+Poultry manure are the best management approach for the excellent performance of rice cultivar Binadhan-8.

关键词： Growth stage high yielding rice cultivar internal N use efficiency water productivity

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