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上海航天 1989年第1期6卷 16-23页

作者： romesh k.aggarwal Charles R.Moore 陈渊

倾斜转弯(BTT)导弹的非线性的俯仰和偏航动态耦合,是由导弹的侧向加速度和倾斜角引起的。由于这些非线性动态特性,最优加速度和倾斜速率指令的解只能通过两点边值问题求解的数值方法得到。具体实现时,必须有相应于现行系统状态其它部分... 详细信息

倾斜转弯(BTT)导弹的非线性的俯仰和偏航动态耦合,是由导弹的侧向加速度和倾斜角引起的。由于这些非线性动态特性,最优加速度和倾斜速率指令的解只能通过两点边值问题求解的数值方法得到。具体实现时,必须有相应于现行系统状态其它部分的动态过程,最优控制问题的解可以用扰动技术得到,这种技术根据能解的降阶问题的解,然后规定降阶解组合成全阶问题的近似解的方法,把系统分成慢速和快速状态。这种技术过去已被用于飞机和导弹弹道最优问题,可是这个问题的表述与其他问题不同。因为小扰动系数是滚动控制代价的加权因子。这样当这参数较小时,滚动控制代价也变得非常小,即这问题看成是"经济控制"问题。合成解由作为现行系统状态函数的滚动速率和加速度指令组合,"零阶慢速"解是侧滑转弯导弹的最优制导律。认为滚动速率无限快,忽略导弹倾斜角的动态情况可有效地获得这个解。"零阶快速"解提供滚动指令,这被认为是补偿倾斜角有限动态特性的校正项。慢速解需要一个"一阶"校正项,通常这一项用扰动理论来获得。但是对于这个问题,一个恰当"慢速"解能通过最优条件来得到,在仿真比较中,利用反向扫描方法可获得最优解,结果表明,BTT 导弹的"次优制导规律"是有效的。

关键词：导弹制导次优制导规律倾斜转弯

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Major Soil Chemical Properties of the Major Tea-Growing Areas in India

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Pedosphere 2015年第2期25卷 316-328页

作者： Tanmoy kARAk Ranjit kumar PAUL romesh kumar BORUAH Indira SONAR Biswajyoti BORDOLOI Amrit kumar DUTTA Borsha BORkOTOkY Upper Assam Advisory Centre Tea Research Association Division of Statistical Genetics Indian Agricultural Statistics Research Institute Arunachal Advisory Centre Tea Research AssociationDirectorate of Trade and CommerceGovernment of Arunachal Pradesh

Major chemical properties of tea-growing soils are of paramount importance for better management in a sustainable ***,this study was carried out to understand the major soil chemical properties of major tea(Camellia sinensis L.)-growing areas,Dibrugarh and Tinsukia districts,in the state of Assam,India.A total of 991 surface soil samples were collected from 15 large tea estates(TEs) for analysis of their major chemical *** pH ranged from 3.61 to *** organic carbon and total nitrogen ranged from 2.4 to 47.3 and 0.24 to 3.60 g kg^(-1),*** soils were sufficiently rich in plant-available potassium(as k_2O),which ranged from 127.71 to 252.33 mg kg^(-1),exceeding the amount prescribed for optimum tea yield of > 100 mg kg^(-1).Plant-available sulfur among soil samples widely varied from 4 to 129 mg kg^(-1).Results of hierarchical clustering analysis for homogenous grouping of the 15 TEs based on soil chemical properties showed that the 15 TEs could be classified into three distinct groups which consisted of6,8 and 1 TEs,*** on the kolmogorov-Smirnov(k-S) test,the best fitted theoretical probability distributions were found out for different soil chemical *** could be concluded that a balanced fertilizer application would be needed as a part of tea improvement program using soil chemical test.

关键词： organic carbon plant-available potassium plant-available sulfur probability distribution soil pH tea estates total nitrogen

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Identification of QTLs for Yield and Associated Traits in F_(2) Population of Rice

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Phyton-International Journal of Experimental Botany 2022年第11期91卷 2439-2459页

作者： Rohini Bhat Anil kumar Singh Muntazir Mushtaq romesh kumar Salgotra Manmohan Sharma Basharat Ahmad Bhat Umer Basu Ibrahim Al-Ashkar Mohammad Anwar Hossain Akihiro Ueda Ayman El Sabagh ICAR-Directorate of Onion and Garlic RajgurunagarPuneMaharashtra410505India School of Biotechnology Sher-e-Kashmir University of Agricultural Sciences and Technology of JammuChatha180009India ICAR-National Bureau of Plant Genetic Resources Pusa CampusNew Delhi110012India Department of Bio-Resources University of KashmirJammu and Kashmir190006India Division of Plant Pathology Sher-e-Kashmir University of Agricultural Sciences and Technology of JammuChatha180009India Department of Plant Production College of Food and AgricultureKing Saud UniversityRiyadh11451Saudi Arabia Department of Genetics and Plant Breeding Bangladesh Agricultural UniversityMymensingh2202Bangladesh Graduate School of Integrated Sciences for Life Hiroshima UniversityHigashi-Hiroshima739-8528Japan Department of Agronomy Faculty of AgricultureKafrelsheikh UniversityKafrelsheikh33516Egypt

Identification of quantitative trait loci(QTLs)controlling yield and yield-related traits in rice was performed in the F_(2) mapping population derived from parental rice genotypes DHMAS and k343.A total of 30 QTLs governing nine different traits were identified using the composite interval mapping(CIM)*** QTLs were mapped for number of tillers per plant on chromosomes 1(2 QTLs),2 and 3;three QTLs for panicle number per plant on chromosomes 1(2 QTLs)and 3;four QTLs for plant height on chromosomes 2,4,5 and 6;one QTL for spikelet density on chromosome 5;four QTLs for spikelet fertility percentage(SFP)on chromosomes 2,3 and 5(2 QTLs);two QTLs for grain length on chromosomes 1 and 8;three QTLs for grain width on chromosomes1,3 and 8;three QTLs for 1000-grain weight(TGW)on chromosomes 1,4 and 8 and six QTLs for yield per plant(YPP)on chromosomes 2(3 QTLs),4,6 and *** of the QTLs were detected on chromosome 2,so further studies on chromosome 2 could help unlock some new chapters of QTL for this cross of rice *** QTLs elucidating high phenotypic variance can be used for marker-assisted selection(MAS)***,the exploitation of information regarding molecular markers tightly linked to QTLs governing these traits will facilitate future crop improvement strategies in rice.

关键词： Rice QTL mapping linkage map SSR markers composite interval mapping marker-assisted selection

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