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控制马铃薯杂草的除草剂的评价

园艺与种苗 1991年第1期 47-48页

作者： p.s.shekhawat 赵侠

在马铃薯作物生长早期可发现与之竞争的一年生杂草。这对作物产量产生不利的影响。人工防治杂草在马铃薯作物中是有效的,但当今劳动力的投入变得非常昂贵,用于农业的劳动力十分缺乏。因此,为了充分发挥作物的高产潜力,一种经济的防治马铃薯杂草的除草剂是必需的。田间试验于1987～1988年雨后季在印度乌代普尔的 vertisols 进行,土壤为粘壤土,呈碱

关键词：杂草干重作物生长除草剂除草通马铃薯土豆茄属

Understanding peroral absorption:regulatory aspects and contemporary approaches to tackling solubility and permeability hurdles

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Acta pharmaceutica sinica B 2017年第3期7卷 260-280页

作者： prachi B.shekhawat Varsha B.pokharkar Department of pharmaceutics Poona College of PharmacyBharati Vidyapeeth Deemed UniversityErandwaneKothrudPune 411038India

Oral drug absorption is a process influenced by the physicochemical and biopharmaceutical properties of the drug and its inter-relationship with the gastrointestinal tract. Drug solubility, dissolution and permeability across intestinal barrier are the key parameters controlling absorption. This review provides an overview of the factors that affect drug absorption and the classification of a drug on the basis of solubility and permeability. The biopharmaceutical classification system(BCs) was introduced in early90's and is a regulatory tool used to predict bioavailability problems associated with a new entity, thereby helping in the development of a drug product. strategies to combat solubility and permeability issues are also discussed.

关键词： BCs solubility permeability Formulation strategies Factors affecting absorption

Nonunion of forearm fracture： a rare instance in a toddler

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Chinese Journal of Traumatology 2012年第6期15卷 379-381页

作者： pramod saini sanjay Meena Vishal shekhawat Tanmay s Kishanpuria Department of Orthopaedics All India Institute of Medi-cal Sciences(AIIMS)Ansari NagarNew Delhi 110029India Department of Orthopaedics SMS Medical CollegeJaipurRajasthan 302004

When compared to adults, pediatric frac- tures unite readily and nonunion is quite rare. Nonunion is often associated with open fractures, operative interventions, infection, pediatric osteogenesis imperfecta and neurofibromatosis. There are only a few studies and reports mentioning nonunion following conservative ma- nagement of closed pediatric fractures. We report here a case of an eighteen-month-old child who developed non-union following treatment of fracture of both forearm bones with cast and was successfully treated with plating. To the best of our knowledge, this is the youngest reported case of nonunion following conservative management of closed diaphyseal pediatric fracture.

关键词： Forearm Fractures, bone Child

Effect of calcination temperature on steam reforming activity of Ni-based pyrochlore catalysts

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Journal of Rare Earths 2020年第7期38卷 711-718,I0002页

作者： Daniel J.Haynes Dushyant shekhawat David Berry Amitava Roy James J.spivey National Energy Technology Laboratory U.S.Department of Energy3610 Collins Ferry RdMorgantownWV26507 USA Louisiana state University Cain Department of Chemical Engineering3307 Patrick Taylor HallBaton RougeLA70803USA

This work served as the second part of a study evaluating the effect of calcination temperature(700-1000℃) on Ni-based lanthanum zirconate pyrochlore catalysts for methane steam reforming.A previous study(Haynes et ***.2017(43) 16744) provided a thorough characterization of the material properties for the catalysts used here,and this study focuses on the evaluation of catalytic *** activity was assessed by two different experimental studies:the effect of reaction temperature using a temperature programmed surface reaction(TpsR),and the effect of reaction *** results demonstrate a complex interaction between the Ni particles and surface LaOx species under the methane steam reforming ***,the material calcined at the lowest temperature(700℃) possesses the highest activity and selectivity,which is attributed to smaller and more welldispersed Ni particles on the surface,and,more importantly,a lesser degree La enrichment at the *** catalysts were deactivated by steam to NiO under all conditions tested,but at certain low reaction pressure(p=0.23 Mpa) conditions the materials calcined at 700-900℃ are able to completely recover equilibrium activity in-situ that is then robust and stable under both low and high reaction pressures(p=1.8 Mpa) suggesting the formation of a synergistic relationship between Ni and La for syngas ***,exposure of a fresh material to high reaction pressures leads to a rapid and irreversible loss in both CH4 conversion and syngas selectivity whether in the fresh(no pretreatment),or pretreated(steam,H2 or Ar only at 800℃) form for any *** mechanism for deactivation appears to be due to the presence of LaOx species that become mobile,possibly by the formation of La-OH,and covers the active Ni particles and inhibits sites responsible for the CH4 decomposition.

关键词： Nickel pyrochlore Methane steam reforming Catalyst Lanthanum enrichment

Machine learning for weed–plant discrimination in agriculture 5.0:An in-depth review

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Artificial Intelligence in Agriculture 2023年第4期10卷 13-25页

作者： Filbert H.Juwono W.K.Wong seema Verma Neha shekhawat Basil Andy Lease Catur Apriono Department of Electrical and Electronic Engineering Xi'an Jiaotong-Liverpool UniversitySuzhou 215123China Dpartment of Electrical and Computer Engineering Curtin University MalaysiaMiri 98009Malaysia school of physical sciences Banasthali VidyapithRajasthan 304022India Department of Electrical Engineering Universitas IndonesiaDepok 16424Indonesia

Agriculture 5.0 is an emerging concept where sensors,big data,Internet-of-Things(IoT),robots,and Artificial In-telligence(AI)are used for agricultural *** from Agriculture 4.0,robots and AI become the focus of the implementation in Agriculture *** of the applications of Agriculture 5.0 is weed management where robots are used to discriminate weeds from the crops or plants so that proper action can be performed to remove the *** paper discusses an in-depth review of Machine Learning(ML)techniques used for discriminating weeds from crops or *** specifically present a detailed explanation of five steps required in using ML algorithms to distinguish between weeds and plants.

关键词： Agriculture 5.0 Machine learning Unmanned aerial vehicle Weed-plant discrimination

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印度塔尔沙漠树种的组织培养无性繁殖

广西林业科技 1989年第4期18卷 30-33页

作者： H.C.Arya N.s.shekhawat 叶德敏林业部华东林业调查设计院情报室

一、前言印度塔尔沙漠面积28600平方公里,是世界上居住人口最多的沙漠区。其气候和土壤条件特点是温度高、雨量低而不稳、蒸发远大于降水、土壤有机质含量低、干燥风强。随着人口和牲畜数量的增长,食物、饲料、木材和薪材的需求日益增加... 详细信息

一、前言印度塔尔沙漠面积28600平方公里,是世界上居住人口最多的沙漠区。其气候和土壤条件特点是温度高、雨量低而不稳、蒸发远大于降水、土壤有机质含量低、干燥风强。随着人口和牲畜数量的增长,食物、饲料、木材和薪材的需求日益增加,从而使森林和边缘农地开发过度,继而渐渐导致严重的沙漠化和环境退化。在沙漠区主要城镇附近建起的工业则进一步增加了这种危险。

关键词：沙漠树种组织培养无性繁殖

A controlled, efficient and robust process for the synthesis of an epidermal growth factor receptor inhibitor: Afatinib Dimaleate

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Chemical Reports 2019年第1期1卷 3-12页

作者： pawan Kumar premnath Dhande Muhammad Taufiq F. Mazlee suhaila M. Yaman Nurul syazwani Nadirah Binti Muhammad syafiq Chandran Mohd Zulfadli Bin Makhtar Dhramveer singh shekhawat sunil Vasudeorao Lanke Ramesh Kumar sandeep Mhetre Oncogen pharma sdn Bhd No.3 Jalan Jururancang U1/21 Hicom Glenmarie Industrial Park 40150 Shah Alam Selangor Malaysia.

A simple, controlled, robust and scalable three-stage manufacturing process of Afatinib Dimaleate was assessed and optimized leading to improved yield and quality. The synthetic process involves sequence of reactions as nitro-reduction, amidation and salification. The developed and optimized route was demonstrated on 300 g scale with over all isolated yield of 84% for Afatinib free base. The developed process has the capability to control not only the process related impurities but also the degradation impurities. One new impurity was identified during the process development studies and characterized as acetamide impunity, chemically known as (s)-N-(4-((3-chloro-4-fluorophenyl) amino)-7-((tetrahydrofuran-3-yl) oxy) quinazolin-6-yl) acetamide. Other impurities were identified as degradation impurities, process impurities and were labeled as 1-(4-((3-chloro-4-fluorophenyl) amino)-7-(((s)-tetrahydrofuran-3-yl) oxy) quinazoline-6-yl)-5-Hydroxypyrrolidin- 2-one (hydroxy impurity), Afatinib N-Oxide impurity and N4-(3-chloro-4-fluorophenyl)-7-[[(3s)-tetrahydro- 3-furanyl] oxy]-4,6-quinazolinediamine (Intermediate-1).

关键词： Afatinib Dimaleate HpLC degradation impurities NMR LC-Ms new process impurity improved process