检索结果-南通市图书馆

Life cycle greenhouse gas emissions from five contrasting rice production systems in the tropics

Pedosphere 2023年第6期33卷 960-971页

作者： Pradeep k.DASH Pratap BHATTACHARYYA Soumya R.PADHY Amaresh k.nayak Annie POONAM Sangita MOHANTY Crop Production Division Indian Council of Agriculture Research(ICAR)-National Rice Research Institute(NRRI)GuttackOdisha 753006India

Carbon footprint (CF) quantification of major rice production systems (RPSs) is a prerequisite for developing strategies for climate change mitigation in agriculture. Total life cycle greenhouse gas emissions (LC-GHGs) from rice production to consumption might provide precise CFs for RPSs. Therefore, we assessed three segments (pre-farm, on-farm, and post-farm) of LC-GHGs under five major contrasting RPSs, i.e., aerobic rice (AR), shallow lowland rice(SLR), system of rice intensification (SRI), deep water rice (DWR), and zero-tilled direct-seeded rice (ZTR), in India to determine the corresponding *** footprint was the lowest for ZTR, while LC-GHGs were the lowest for AR. Therefore, AR is an adequate option for short-term reduction of GHG emissions. However, ZTR might be promoted by incentives as a long-term strategy. Among segmental LC-GHGs, on-farm GHG emissions contributed less than the other two segmental GHG emissions. The post-farm (i.e., farm gate to consumption) segment contributed the largest proportion (54%–69%) of total LC-GHGs, followed by pre-farm (i.e., cradle to farm) segment (21%–27%) and on-farm operation (11%–23%). These findings suggest that post-farm components that contribute to maximum GHG emissions must be scientifically tackled with proactive policy initiatives. However, the data of this segment are limited and scattered. Therefore, real-time assessment of GHG emissions during post-farm operation and input transportation from cradle to farm requires more precise quantification. Although CF in SRI was higher, this system had the potential to achieve higher yields and better soil carbon storage. Therefore,SRI may be encouraged from the perspectives of food security and long-term sustainability by reducing GHG emissions by three to four times.

关键词： carbon-equivalent emission carbon footprint climate change mitigation global warming management practice soil carbon stock:

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Data-driven methods for discovery of next-generation electrostrictive materials

引用

npj Computational Materials 2022年第1期8卷 2393-2399页

作者： Dennis P.Trujillo Ashok Gurung Jiacheng Yu Sanjeev k.nayak S.Pamir Alpay Pierre-Eymeric Janolin Department of Materials Science and Engineering and Institute of Materials Science University of ConnecticutStorrsCT06269USA X-Ray Science Division Argonne National LaboratoryLemontIL60439USA Department of Physics University of ConnecticutStorrsCT06269USA UniversitéParis-Saclay CentraleSupélecCNRSLaboratoire SPMS91190Gif-sur-YvetteFrance

All dielectrics exhibit electrostriction,i.e.,display a quadratic strain response to an electric field compared to the linear strain dependence of *** such,there is significant interest in discovering new electrostrictors with enhanced electrostrictive coefficients,especially as electrostrictors can exhibit effective piezoelectricity when a bias electric field is *** present the results of a study combining data mining and first-principles computations that indicate that there exists a group of iodides,bromides,and chlorides that have electrostrictive coefficients exceeding 10 m^(4)C^(–2)which are substantially higher than typical oxide electrostrictive ceramics and *** corresponding effective piezoelectric voltage coefficients are three orders of magnitude larger than lead zirconate titanate.

关键词： strict piezoelectric exceeding

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Insight into point defects and impurities in titanium from first principles

引用

npj Computational Materials 2018年第1期4卷 575-584页

作者： Sanjeev k.nayak Cain J.Hung Vinit Sharma S.Pamir Alpay Avinash M.Dongare William J.Brindley Rainer J.Hebert Department of Materials Science and Engineering and Institute of Materials Science University of ConnecticutStorrsCT 06269USA Department of Physics University of ConnecticutStorrsCT 06269USA Pratt&Whitney East HartfordCT 06108USA Additive Manufacturing Innovation Center University of ConnecticutStorrsCT 06269USA Materials Science and Technology Division Oak Ridge National LaboratoryOak RidgeTN 37831USA

Titanium alloys find extensive use in the aerospace and biomedical industries due to a unique combination of strength,density,and corrosion *** of mostly experimental research has led to a large body of knowledge of the processingmicrostructure-properties *** much of the existing understanding of point defects that play a significant role in the mechanical properties of titanium is based on semi-empirical *** this work,we present the results of a detailed self-consistent first-principles study that was developed to determine formation energies of intrinsic point defects including vacancies,selfinterstitials,and extrinsic point defects,such as,interstitial and substitutional impurities/*** find that most elements,regardless of size,prefer substitutional positions,but highly electronegative elements,such as C,N,O,F,S,and Cl,some of which are common impurities in Ti,occupy interstitial positions.

关键词： corrosion microstructure titanium

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

毫米级分辨力全脑动态增强MRI对高级别胶质瘤病人的伪重测评估

引用

国际医学放射学杂志 2021年第5期 605-605页

作者： Y.Bliesener R.Lebel J.Acharya R.Frayne k.nayak 白晶晶

摘要sub-Nyquist采样动态增强(DCE)MRI的进展使毫米级分辨力和全脑覆盖的脑肿瘤监测成为可能。这种下采样的定量方法需要对可实现的重测的可重复性进行仔细表征。

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Practice patterns among ophthalmic surgeons in treating concomitant oculoplastic conditions in preoperative period:A questionnaire-based study

引用

World Journal of Clinical Cases 2025年第1期13卷 29-37页

作者： Bijnya Birajita Panda Chitaranjan Mishra Bhagabat nayak Avik kumar Roy Logesh Balakrishnan Priyadarshini Mishra Department of Ophthalmology All India Institute of Medical SciencesBhubaneswar 751019OdishaIndia Department of Vitreo-Retina Trilochan NetralayaSambalpur 768004India Department of Glaucoma Services LV Prasad Eye InstituteBhubaneswar 751013India Department of Statistics Apollo HospitalsChennai 823104India

BACkGROUND Addressing oculoplastic conditions in the preoperative period ensures both the safety and functional success of any ophthalmic *** oculoplastic conditions,like nasolacrimal duct obstruction,have been extensively studied,whereas others,like eyelid malposition and thyroid eye disease,have received minimal or no *** To investigate the current practice patterns among ophthalmologists while treating concomitant oculoplastic conditions before any subspecialty ophthalmic *** A cross-sectional survey was disseminated among ophthalmologists all over *** survey included questions related to pre-operative evaluation,anaesthetic and surgical techniques preferred,post-operative care,the use of adjunctive therapies,and patient follow-up *** A total of 180 ophthalmologists responded to the *** practitioners(89%)felt that the ROPLAS test was sufficient during pre-operative evaluation before any subspecialty surgery was *** most common surgical techniques employed were lacrimal drainage procedures(Dacryocystorhinostomy)(63.3%),eyelid malposition repair(36.9%),and ptosis repair(58.7%).Post-operatively,47.7%of respondents emphasized that at least a 4-week gap should be maintained after lacrimal drainage procedures and eyelid ***-seven percent of ophthalmologists felt that topical anaesthetic procedures should be preferred while performing ocular surgeries in thyroid eye disease *** Approximately 50%of ophthalmologists handle prevalent oculoplastic issues themselves,seeking the expertise of an oculoplastic surgeon under particular *** ophthalmologists still favor using ROPLAS as a preliminary screening method before proceeding with cataract *** conditions and thyroid eye disease are not as commonly addressed before subspecialty procedures compared to issues like nasolacrimal duct obstruction and periocular infections.

关键词： Oculoplasty Ophthalmic plastic surgery Nasolacrimal duct obstruction Practice patterns Survey

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Synthesis and Characterization of Bio-based Epoxy Blends from Renewable Resource Based Epoxidized Soybean Oil as Reactive Diluent

引用

Chinese Journal of Polymer Science 2015年第1期33卷 137-152页

作者： Sushanta k Sahoo Smita Mohanty Sanjay k.nayak Laboratory for Advanced Research in Polymeric Materials (LARPM) Central Institute of Plastics Engineering & Technology (CIPET)B/25 CNI complex Patia Bhubaneswar 751024 Odisha India

A novel bioresin, epoxidized soybean oil was synthesized by in situ method and was characterized employing FTIR and NMR. The bioresin was blended with epoxy（DGEBA） at different ratios as reactive diluents for improved processibility and toughened nature. The composition with 20 wt% bioresin exhibited improved impact strength to the tune of 60% as compared to virgin epoxy. Fracture toughness parameters critical stress intensity factor（kIC） and critical strain energy release rate（GIC） were evaluated using single edge notch bending test and demonstrated superior enhancement in toughness. Dynamic mechanical, thermal, thermo mechanical and fracture morphological analyses have been studied for bio-based epoxy blends. Curing kinetics has been evaluated through DSC analysis to investigate the effect of bioresin on cross-linking reaction of neat epoxy with triethylenetetramine as curing agent.

关键词： Bio-based epoxy Soybean oil Fracture toughness Curing kinetics TMA.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Preparation of Sm2O3 and Co3O4 from SmCo magnet swarf by hydrometallurgical processing in chloride media

引用

Journal of Rare Earths 2018年第7期36卷 725-732页

作者： k.Sahoo A.k.nayak M.k.Ghosh k.Sarangi CSIR-Institute of Minerals and Materials Technology Bhubaneswar-751013OdishaIndia

The recycling of rare earth elements（REE） from end-of-life REE based products is an environment friendly proposition. Waste Sm-Co based permanent magnet generated during machining is a good source for both Sm and Co. In the present study a simpler process of acid leaching at 80 ℃ followed by solvent extraction, oxalate precipitation and calcination is described for producing pure Sm2 O3 and Co3 O4. With either 10 vol% H2SO4 or 15 vol% HCI at 80 ℃ more than 95% Sm and Co are leached in 1 *** of Sm from sulphate leach liquor with TBP or Aliquat 336 was poor. Although extraction with TOPS-99 is quantitative but Sm from sulphate leach liquor precipitated as Sm2（SO4）3·8 H2O. The chloride leach liquor at an initial pH of 2.5 and with 1.2 mol/L TOPS-99 shows requirement of 4-stages at A：O = 3：2. Stripping with oxalic acid precipitates Sm-oxalate which is calcined at 800 ℃ to produce Sm2 O3. Co3 O4 is recovered from the raffinate through oxalate precipitation followed by calcination at450℃.

关键词： SmCo magnet Samarium Cobalt TOPS-99 Solvent extraction Precipitation stripping

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Potential of the neonicotinoid imidacloprid and the oxadiazine indoxacarb for controlling five coleopteran pests of stored grain

引用

Insect Science 2012年第1期19卷 96-101页

作者： Gregory J. Daglish Manoj k. nayak Agri-Science Queensland Department of Employment Economic Development and Innovation Brisbane Queensland Australia

The potential for using imidacloprid （a neonicotinoid） and indoxacarb （an oxadiazine） as grain protectants was investigated in bioassays against resistant strains of five stored grain beetles. The species investigated were Rhyzopertha dominica （E）（the lesser grain borer）, Sitophilus oryzae （L.）（the rice weevil）, Tribolium castaneum （Herbst）（the rust-red flour beetle）, Oryzaephilus surinamensis （L.）（the saw tooth flour beetle）, and Cryptolestesferrugineus （Stephens）（the fiat grain beetle）. Each of these species has developed resistance to one or more protectants, including organophosphorus insecticides, synthetic pyrethroids and the juvenile hormone analogue methoprene. Mortality and re- production after a 2-week exposure of adults to treated wheat depended on species, dose and insecticide. Imidacloprid had no effect on S. oryzae at any dose, but none of the other species produced any live progeny at 10 mg/kg. Indoxacarb had no effect on T. castaneum at any dose, but none of the other species produced any live progeny at 5 mg/kg. The results show that although both imidacloprid and indoxacarb can control at least four of the five key pests tested at doses comparable to those used for organophosphorus protectants, more potent neonicotinoid or oxadiazine insecticides would be needed than either of these to provide broad spectrum protection of stored grain .

关键词： beetles imidacloprid indoxacarb stored grain

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Malignant otitis externa with subsequent internal jugular vein thrombosis and hypoglossal palsy:a report and review of literature

引用

Journal of Otology 2020年第3期15卷 112-116页

作者： k Devaraja Dipak Ranjan nayak Department of Otorhinolaryngology and Head and Neck Surgery Kasturba Medical CollegeManipal Academy of Higher EducationUdupiKarnataka576104India

Inflammation of a part or whole of the temporal bone and surrounding soft tissue is termed as malignant otitis externa,which typically spreads to skull base to involve cranial nerves *** can it also effect one or more of cranial nerves IX,X,XI,and *** present a case of malignant otitis externa which presented with symptomatic palsy of IX and XII nerves sparing the VII cranial *** patient though later on had internal jugular vein thrombosis,which we presume is due to the involvement of the parapharyngeal space that prompted us to reconsider the diagnosis,and later on,to aggravate the *** proper blood sugar control and appropriate long term antibiotics,not only that the patient is disease free at one year follow up,but the cranial nerve deficits also *** from sharing the clinical and management details of this patient,we have reviewed the relevant literature in the discussion,which has shed some light onto some of the interesting facts about this condition and its prognosis.

关键词： Skull base osteomyelitis Malignant otitis externa Hypoglossal palsy Diabetes mellitus Internal jugular vein

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Soret and Dufour effects on mixed convection unsteady MHD boundary layer flow over stretching sheet in porous medium with chemically reactive species

引用

Applied Mathematics and Mechanics(English Edition) 2014年第7期35卷 849-862页

作者： A.nayak S.PANDA D.k.PHUkAN Silicon Institute of Technology Bhubaneswar 751024 India Department of Mathematics National Institute of Technology Calicut 673601 India Department of Mathematics Moran College Moranhat Assam 785670 India

This paper studies the thermal-diffusion and diffusion thermo-effects in the hydro-magnetic unsteady flow by a mixed convection boundary layer past an imperme- able vertical stretching sheet in a porous medium in the presence of chemical reaction. The velocity of t^he stretching surface, the surface temperature, and the concentration are assumed to vary linearly with the distance along the surface. The governing partial differential equations are transformed into self-similar unsteady equations using similarity transformations .and solved numerically by the Runge-kutta fourth order scheme in as- sociation with the shooting method for the whole transient domain from the initial state to the final steady state flow. Numerical results for the velocity, the temperature, the concentration, the skin friction, and the Nusselt and Sherwood numbers are shown graph- ically for various flow parameters. The results reveal that there is a smooth transition of flow from unsteady state to the final steady state. A special case of our results is in good agreement with an earlier published work.

关键词： heat and mass transfer boundary layer flow porous media magnetic field,Soret number Dufour number

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：