检索结果-南通市图书馆

Two-dimensional materials for tunable and nonlinear metaoptics

在线全文

学校读者我要写书评

暂无评论

Advanced Photonics 2024年第3期6卷 16-34页

作者： Zeng Wang Kandammathe Valiyaveedu sreekanth Meng Zhao Jinpeng Nong Yincheng Liu Jinghua Teng Agency for Science Technology and Research (A*STAR) Institute of Materials Research and Engineering (IMRE)

Metaoptics formed by ultrathin and planar building blocks enable compact and efficient optical devices that manipulate light at the nanoscale. The development of tunable metaoptics holds the promise of miniaturized and efficient optical systems that can dynamically adapt to changing conditions or requirements,propelling innovations in fields ranging from telecommunication and imaging to quantum computing and sensing. Two-dimensional(2D) materials show strong promise in enabling tunable metaoptics due to their exceptional electronic and optical properties from the quantum confinement within the atomically thin layers. In this review, we discuss the recent advancements and challenges of 2D material-based tunable metaoptics in both linear and nonlinear regimes and provide an outlook for prospects in this rapidly advancing area.

关键词： metaoptics tunable metaoptics two-dimensional optoelectronics nonlinear optics excitons polaritons

Direct-Seeded Rice: Genetic Improvement of Game-Changing Traits for Better Adaption

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Rice science 2024年第4期31卷 417-433页

作者： Priyanka NEGI Jagadish RANE Rajendra Sadashiv WAGH Tukaram Jayaram BHOR Dipti Digambar GODSE Priyanka JADHAV C.ANILKUMAR Dasari sreekanth K.SAMMI REDDY Sharad Ramrao GADAKH K.M.BORAIH C.B.HARISHA P.S.BASAVARAJ Indian Council of Agricultural Research(ICAR)-National Institute of Abiotic Stress Management Baramati 413115India Mahatma Phule Krishi Vidyapeeth Rahuri 413722India ICAR-Central Institute for Arid Horticulture Bikaner 334006India ICAR-National Rice Research Institute Cuttack 753006India ICAR-Directorate of Weed Research Jabalpur 482004India Dr.Panjabrao Deshmukh Krishi Vidyapeeth Akola 444104India

The sustainability of rice production continues to be a subject of uncertainty and inquiry attributed to shifts in climatic conditions. In light of the impending climate change crisis and the high labor and water costs accompanying it, direct-seeded rice(DSR) is unquestionably one of the most practical solutions. Despite its resource and climate-friendly advantages, early maturing rice faces weed competitiveness and seedling establishment challenges. Resolving these issues is crucial for promoting its wider adoption among farmers, presenting it as a more effective sustainable rice cultivation method globally. Diverse traditional and contemporary breeding methods are employed to mitigate the limitations of the DSR approach, leveraging advanced techniques such as speed breeding and genome editing. Focusing on key traits like mesocotyl length elongation, early seedling vigor, root system architecture, and weed competitiveness holds promise for transformative improvements in DSR adaptation at a broader scale within farming communities. This review aims to summarize how these features contribute to increased crop production in DSR conditions and explore the research efforts focusing on enhancing DSR adaptation through these traits. Emphasizing the pivotal role of these game-changing traits in DSR adaptation, our analysis sheds light on their potential transformative impact and offers valuable insights for advancing DSR practices.

关键词： climate change direct-seeded rice aerobic rice early vigor trait

Mechanical and corrosion behaviour of hydroxyapatite reinforced Mg-Sn alloy composite by squeeze casting for biomedical applications

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2020年第2期8卷 452-460页

作者： R Radha D.sreekanth School of Mechanical and Building Sciences Vellore Institute of TechnologyChennai 600127India

Magnesium alloys have gained increasing attention for biomedical applications due to their biocompatibility and the ***(HA)is known to be a highly bioactive because of its similar chemical and crystallographic structures to ***,HA is believed to be a potential ceramic material for the fabrication of Mg based composites,to combine the advantages of both Mg and ***,in general,the composites known to be more susceptible to corrosion attack than the matrix ***,in the present work,Sn is used as an alloying element to evaluate its effect on mechanical as well as corrosion properties of Mg/HA *** with 5 wt%HA and Mg-1 wt%Sn-5 wt%HA composites were prepared separately by stir assisted squeeze casting *** phase analysis and microstructure were characterized by X-ray diffraction(XRD)and scanning electron microscope(SEM)coupled with energy dispersive spectroscopy(EDS)*** properties were evaluated by conducting the compression and micro hardness *** properties of as-cast composites were studied by linear polarization,Tafel and electrochemical impedance spectroscopy(EIS)*** results of both XRD and SEM-EDS revealed that the main constitutional phases of as-cast Mg/HA composites were a-Mg and HA whereas,in Mg-Sn/HA composites,the phase Mg^Sn was observed along with fine distribution of HA *** both the cases,no interfacial reactions *** yield strength,ultimate compression strength and hardness were found to be increased with the addition of Sn in Mg/HA ***,the addition of Sn also played an important role in increasing the corrosion resistance of the Mg/HA composites which was attributed the refinement of grain size and the formation of Mg2Sn phase along the grain ***,it was concluded that the addition of Sn improves both mechanical and corrosion properties of Mg/HA composites.

关键词： Magnesium Composite Biomedical Corrosion Squeeze casting

Insight of magnesium alloys and composites for orthopedic implant applications-a review

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2017年第3期5卷 286-312页

作者： R Radha D sreekanth School of Mechanical and Building Sciences VIT UniversityChennaiIndia

Magnesium(Mg)and its alloys have been widely researched for orthopedic applications *** alloys have stupendous advantages over the commercially available stainless steel,Co-Cr-Ni alloy and titanium *** date,extensive mechanical,in-vitro and in-vivo studies have been done to improve the biomedical performance of Mg alloys through alloying,processing conditions,surface modification *** review comprehensively describes the strategies for improving the mechanical and degradation performance of Mg alloys through properly tailoring the composition of alloying elements,reinforcements and processing *** also highlights the status and progress of research in to(i)the selection of nutrient elements for alloying,reinforcement and its effects(ii)type of Mg alloy system(binary,ternary and quaternary)and composites(iii)grain refinement for strengthening through severe plastic deformation *** it also emphasizes on the importance of Mg composites with regard to hard tissue applications.

关键词： Orthopedic implants Magnesium Alloy system Composites Grain refinement Processing,degradation,strengthening

Genetic and morphological variation in natural teak(Tectona grandis) populations of the Western Ghats in Southern India

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

Journal of Forestry Research 2014年第4期25卷 805-812页

作者： P.M.sreekanth M.Balasundaran P.A.Nazeem Biotechnology and Applied Genetics Bangalore City College New Campus Kalyan Nagar Banaswadi Outer Ring Road Bangalore 560043 India Environmental Biotechnology Tropical Institute of Ecological Sciences Velloor P.O Kottayam – 686501 Kerala India Centre for Plant Biotechnology and Molecular Biology Kerala Agricultural University KAU Campus P.O Thrissur 680656 Kerala India

Teak （Tectona grandis L.f.） is a popular hardwood species native to South and South-East Asia. The possible association of ampli- fied fragment length polymorphism （AFLP） marker with morphological variables of eleven important characters viz. girth at breast height （GBH）, height of tree, bole height, branch knots, presence of fluting, spiral stem, leaf hair, leaf length/breadth ratio, branching pattern, bark colour and petiole shape for nine natural populations comprising 180 genotypes of teak （9 populations x 20 trees）. The phenogram constructed using Euclidean distances for the eleven morphological characters showed that the populations were not grouped according to their geographical origin. The Mantel＇s test for pairwise correlation between Euclidean distances of different morphological variables and genetic distances from AFLP data revealed that only petiole character （r =0.269; p =0.046） and height of tree （r =0,200; p =0.001） were significantly correlated with that of AFLP data matrix. The nine populations in this study covered a geographic area of about 1000 km stretch along the Western Ghat of South India. A test of correlation between genetic and geographic distance matrices revealed a significant positive correlation （r =0.475; p =0.009）. The lack of perfect congruence between morphological and molecular data except for geo-graphic distance, tree height and petiole character suggested that the morphological system might be useful for the morphotypes management but not appropriate to study the genetic structure of the teak populations.

关键词： AFLP genetic teak morphology Tectona grandis

Design,synthesis,characterization,cytotoxic and structure activity relationships of novel Ru(Ⅱ) complexes

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2015年第6期26卷 721-726页

作者： sreekanth Thota Srujana Vallala Rajeshwar Yerra Eliezer J.Barreiro National Institute for Science and Technology on Innovation on Neglected Diseases (INCT/IDN) Center for Technological Development in Health (CDTS)Fundao Oswaldo CruzMinistério da SadeAv.Brasil 4036Prédio da Expanso8° AndarSala 814Manguinhos21040-361 Rio de JaneiroRJBrazil Programa de Desenvolvimento de Frmacos Instituto de Ciências BiomédicasUniversidade Federal do Rio de Janeiro S.R. College of Pharmacy Department of Pharmaceutical Chemistry & Toxicology

Platinum containing compounds have shown antineoplastic potential, but their clinical applications have been limited by high toxicity. Ruthenium containing complexes have long been known to be well suited for biological applications, and have long been utilized as replacements to popular platinum based-drugs. Here, we report a novel series of ruthenium（ll） arene compounds bearing thiosemicarba- zone and isonicotinylhydrazone ligands with potent anticancer activity their structure activity relationships and apoptosis was studied. The cytotoxic activity of the new ruthenium（ll） arene compounds has been evaluated in several cell lines （Molt 4/C8, LI 210, CEM, HL60 and BEL7402）. Among them, ten complexes were found to be excellent in vitro growth inhibitory activity against various cell lines with IC50 in the sub-micromolar range.

关键词： Cytotoxic Ligand Ruthenium compounds Structure activity relationships

Structural Tuning of Low Band Gap Intermolecular Push/Pull Side-chain Polymers for Organic Photovoltaic Applications

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2017年第9期35卷 1073-1085页

作者： Ansuman Nayak P.S. Rama.sreekanth Santosh Kumar Sahu Duryodhan Sahu Department of Chemistry National Institute of Science and Technology Palur Hills Berhampur Odisha India 761008 Department of Chemistry Gandhi Institute of Engineering and Technology Gunpur Odisha India Department of Mechanical Engineering National Institute of Science and Technology Palur Hills Berhampur Odisha India 761008

A series of novel low band gap donor-acceptor （D-A） type organic co-polymers （BT-F-TPA, BT-CZ-TPA and BT-SI-TPA） consisting of electron-deficient acceptor blocks both in main chains （M1） and at the pendant （M2） were polymerized with different electron rich donor （M3-M5） blocks, i.e., 9,9-dihexyl-9H-fluorene, N-alkyl-2,7-carbazole, and 2,6-dithinosilole, respectively, via Suzuki method. These polymers exhibited relatively low band gaps （1.65-1.88 eV） and broad absorption ranges （680-740 nm）. Bulk heterojunction （BHJ） solar cells incorporating these polymers as electron donors, blended with [6,6]-phenyl-C61-butyric acid methyl ester （PC61BM） or [6,6]-phenyl-Cvl-butyric acid methyl ester （PC71BM） as electron-acceptors in different weight ratios were fabricated and tested under 100 mW/cm2 of AM 1.5 with white-light illumination. The photovoltaic device containing donor BT-SI-TPA and acceptor PC71BM in 1：2 weight ratio showed the best power conversion efficiency （PCE） value of 1.88%, with open circuit voltage （Voc） = 0.75 V, short circuit current density （Jsc） = 7.60 mA/cm2, and fill factor （FF） = 33.0%.

关键词： Polymer solar cells Low band gap Conducting polymers Charge transfer Donor-acceptor Bulk heterojunctionsolar cell

Nivolumab-induced severe bullous pemphigoid in a patient with renal cancer:a case report and literature review

在线全文

学校读者我要写书评

暂无评论

Journal of Cancer Metastasis and Treatment 2020年第1期6卷 492-500页

作者： Xiaorong Wu sreekanth Palvai Awais Jalil Department of Medical Oncology Southend University Hospital NHS Foundation TrustPrittlewell ChaseWestcliff-on-SeaEssex SS00RYUnited Kingdom

With the widespread use of immunotherapy in numerous solid tumours,immunotherapy-related adverse events(irAEs)have started to emerge and bring new challenges for clinicians to *** established irAEs,dermatologic toxicity is one of the most common toxicities;it is often mild but can be severe and potentially life-threatening,such as bullous ***,we report a case of nivolumab-mediated severe,extensive,refractory bullous pemphigoid involving both skin and oral mucosa in a patient with metastatic renal *** also summarise a list of selected case reports of immunotherapy-induced bullous pemphigoid by literature *** highlight various presentations,investigations and managements of this type of skin ***,we would like to discuss the correlation of skin irAEs incidence rate with immunotherapy drug benefit and resistance.

关键词： Bullous pemphigoid mucous membrane pemphigoid immunotherapy dermatologic toxicity nivolumab

Measurements of atmospheric turbulence parameters at Vainu Bappu Observatory using short-exposure CCD images

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

Research in Astronomy and Astrophysics 2019年第5期19卷 123-132页

作者： sreekanth Reddy V. Ravinder Kumar Banyal Sridharan R. Aishwarya Selvaraj Indian Institute of Astrophysics

We report atmospheric turbulence parameters, namely atmospheric seeing, tilt-anisoplanatic angle(θ_0) and coherence time(Τ_0), measured under various sky conditions, at Vainu Bappu Observatory in Kavalur. Bursts of short exposure images of selected stars were recorded with a high-speed, frame-transfer CCD mounted on the Cassegrain focus of a newly commissioned 1.3 m telescope. The estimated median seeing is ≈ 1.85 " at wavelength of ～ 600 nm, the image motion correlation between different pairs of stars is ～44% for θ0≈ 36" and mean Τ_0 is ≈ 2.4 ms. This work was motivated by the design considerations and expected performance of an adaptive optics system that is currently being planned for the telescope.

关键词： atmospheric effects turbulence instrumentation:adaptive optics catalogs methods:observational