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Size-dependent optical properties of Au nanorods

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Progress in Natural Science:Materials International 2013年第1期23卷 36-43页

作者： S.L.Smitha K.G.Gopchandran N.Smijesh reji philip Department of Optoelectronics University of KeralaThiruvananthapuram-695 581India St.Joseph's College for Women Alappuzha-688 001India Raman Research Institute C.V.Raman AvenueSadashivanagarBangalore 560080India

In the fast evolving field of nanoscience and nanotechnology,where size and shape are crucial in deciding the optoelectronic properties of nanomaterials,the understanding of size and shape dependent behavior is of direct relevance to device *** study reports the synthesis of Au nanorods with well controlled aspect ratios,and the influence of the aspect ratio on the surface enhanced Raman scattering(SERS) activity using crystal violet(CV) as the probe *** influence of pH and the concentrations of reducing agent and Ag ions in controlling the aspect ratio of gold nanorods are also *** structural and optical properties of the synthesized samples have been characterized by transmission electron microscopy(TEM) and UV-visible absorption *** nonlinear optical(NLO) transmission of the Au nanorods investigated using the open aperture Z-scan technique revealed the absorption saturation followed by an optical limiting behavior,which may find potential applications in optoelectronic nanodevices.

关键词： Au nanorods SERS Crystal violet Z-scan Nonlinear absorption Optical limiting

Synthesis, characterization, cytotoxicity, DNA cleavage and antimicrobial activity of homodinuclear lanthanide complexes of phenylthioacetic acid

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Journal of Rare Earths 2013年第10期31卷 1009-1016页

作者： T. F. Abbs Fen reji A. Jeena Pearl Bojaxa A. Rosy Department of Chemistry & Research Centre Nesamony Memorial Christian College Department of Chemistry& Research Centre Scott Christian College Department of Botany & Research Centre Holy Cross College (Autonomous)

Lanthanide complexes of Eu（III）, Gd（III）, Nd（III）, Sm（III）, and Tb（III） with phenylthioacetic acid were synthesized and characterized by elemental analysis, mass, infrared radiation （IR）, electronic spectra, molar conductance, thermogravimetric analysis （TGA）, and powder X-ray diffraction （XRD）. The results showed that the lanthanide complexes were homodinuclear in nature. The two lanthanide ions were bridged by eight oxygen atoms from four carboxylate groups. Thermal decomposition profiles were consis- tent with the proposed formulations. Powder XRD studies showed that all the complexes were amorphous in nature. Antimicrobial studies indicated that these complexes exhibited more activity than the ligand itself. The DNA cleavage activity of the ligand and its complexes were assayed on CT DNA using gel electrophoresis in the presence of H202. The result showed that the Eu（Ⅲ） and Nd（Ⅲ） complexes completely cleaved the DNA. The anticancer activities of the complexes were also studied towards human cervical cancer cell line （HeLa） and colon cancer cells （HCT116） and it was found that the Eu（Ⅲ） and Nd（Ⅲ） complexes were more active than the corresponding Gd（Ⅲ）, Sm（Ⅲ）, Tb（Ⅲ） complexes and the free ligand on both the cancer cells.

关键词： lanthanide complexes phenylthioacetic acid antimicrobial DNA cleavage anticancer rare earths

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Genetic-based Fuzzy IDS for Feature Set Reduction and Worm Hole Attack Detection

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Computer Systems Science & Engineering 2023年第5期45卷 1265-1278页

作者： M.reji Christeena Joseph K.Thaiyalnayaki R.Lathamanju Department of Electronics and Communication Engineering Rohini College of Engineering and TechnologyPalkulamKanyakumariIndia Department of Electronics and Communication Engineering SRM Institute of Science and TechnologyRamapuramChennaiIndia

The wireless ad-hoc networks are decentralized networks with a dynamic topology that allows for end-to-end communications via multi-hop routing operations with several nodes collaborating themselves,when the destination and source nodes are not in range of *** of its wireless type,it has lot of security concerns than an infrastructure *** attacks are one of the most serious security vulnerabilities in the network *** is simple to launch,even if there is no prior network *** are the sole thing that preventive measures rely *** detection systems(IDS)and other reactive measures detect all types of *** majority of IDS employ features from various network *** issue is calculating a huge layered features set from an ad-hoc *** research implements genetic algorithm(GA)-based feature reduction intrusion detection approaches to minimize the quantity of wireless feature sets required to identify worm hole *** attack detection,the reduced feature set was put to a fuzzy logic system(FLS).The performance of proposed model was compared with principal component analysis(PCA)and statistical parametric mapping(SPM).Network performance analysis like delay,packet dropping ratio,normalized overhead,packet delivery ratio,average energy consumption,throughput,and control overhead are evaluated and the IDS performance parameters like detection ratio,accuracy,and false alarm rate are evaluated for validation of the proposed *** proposed model achieves 95.5%in detection ratio with 96.8%accuracy and produces very less false alarm rate(FAR)of 14%when compared with existing techniques.

关键词： Intrusion detection system wormhole attack genetic algorithm fuzzy logic wireless ad-hoc network

Design of a Plasmonic Platform to Improve the SERS Sensitivity for Molecular Detection

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Photonic Sensors 2020年第3期10卷 204-214页

作者： Chahinez DAB reji THOMAS Andreas RUEDIGER Chemistry Department Universitéde MontréalMontreal H3C 3J7Canada Division of Research and development Lovely Professional UniversityPunjab 144411India Nanophotonics-Nanoeletronicss Institut National de la Recherche Scientifique INRS-EMTVarennes J3X 1S2Canada

We suggested a plasmonic platform based on a cubic pattern of gold spheres for surface enhanced Raman spectroscopy(SERS).In the case of linear polarization along the symmetry axes,the SERS enhancement per area is identical to hexagonally patterned *** validity of this model was tested using the simulation package of COMSOL Multiphysics®Modeling *** found an improved sensitivity in the near infrared and visible region of the electromagnetic *** method considered tolerance towards stacking faults and suggested a plasmonic platform for ultra-sensing *** design can be extended towards the molecular detection if the proposed plasmonic platform is used with SERS.

关键词： Plasmonic platform SERS enhancement sensitivity finite element method

Soil microbial community structure and activity in a 100-year-old fertilization and crop rotation experiment

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Journal of Plant Ecology 2015年第6期8卷 623-632页

作者： Cancan Zhao Shenglei Fu reji P.Mathew Kathy S.Lawrence Yucheng Feng Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems South China Botanical GardenChinese Academy of Sciences723 Xingke RoadGuangzhou 510650China State Key Laboratory of Cotton Biology Key Laboratory of Plant Stress BiologySchool of Life ScienceHenan University1 Jinming AvenueKaifengHenan 475004China Department of Crop Soil and Environmental SciencesAuburn UniversityAuburnAL 36849USA Department of Entomology and Plant Pathology Auburn UniversityAuburnAL 36849USA

Aims Nitrogen(N)fertilization and lime addition may affect soil micro-bial and nematode communities and ecosystem functions through changing environmental conditions,such as soil pH and soil organic *** objectives of this experiment were to examine the impact of N input and liming on soil microbial and nematode communities and to identify the key environmental determinant of community composition in a century-old fertilization and crop rota-tion *** The field experiment consisting of a 3-year crop rotation regime was established in 1911 in southeastern *** treatments,(i)no-input control,(ii)NPK with winter legume,(iii)PK with legume and lime and(iv)NPK with legume and lime,were included in this *** samples collected at the 0-5 cm depth were used to determine the bacterial growth rate by the 3H-thymidine incorporation *** of 13C into neutral lipids,glycolipids and phospholipid fatty acids(PlFas)was measured after incubation of soil with 13C-labeled acetate for 24 ***-living nematodes in fresh soil were extracted using a density sucrose centrifugal flotation method and identified to trophic group *** Findingsliming resulted in a 10-fold increase in bacterial growth rates compared with the no-input control,whereas N fertilization had no significant *** analysis of PlFa profiles showed that soil microbial community composition was different among the four treatments;the difference was primarily driven by soil *** indicative of gram-negative bacteria covaried with soil pH,but not those of fungi and *** enhanced 13C incorpora-tion into neutral lipids,glycolipids and phospholipids by 2-15 *** addition,13C incorporation into 16:0,16:1ω9,18:1ω9,18:1ω7 and 18:2ω6 were greater than other PlFas,suggesting that gram-negative bacteria and fungi were more active and sensitive to simple C *** nematodes were the dominant trophic group in the soil,but no si

关键词： long-term experiment phospholipid fatty acid analysis stable isotope probing bacterial growth rate soil microbial community

Least Common Multiple of Path, Star with Cartesian Product of Some Graphs

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Journal of Mathematical Research with Applications 2023年第1期43卷 9-15页

作者： T.reji R.RUBY B.SNEHA Department of Mathematics Government College Chittur

A graph G without isolated vertices is a least common multiple of two graphs H1and H2if G is a smallest graph,in terms of number of edges,such that there exists a decomposition of G into edge disjoint copies of H1and *** collection of all least common multiples of H1and H2is denoted by LCM(H1,H2) and the size of a least common multiple of H1and H2is denoted by lcm(H1,H2).In this paper lcm(P4,Pm□Pn),lcm(P4,Cm□ Cn) and lcm(K1,3,K1,m□ K1,n)are determined.

关键词： graph decomposition least common multiple

Upregulation of gastric ghrelin expression is involved in the adaptation mechanism against chronic stress in rats

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Upregulation of gastric ghrelin expression is involved in th...

激光熔凝镍基热喷涂层残余应力的X射线衍射分析

中国生理学会第23届全国会员代表大会暨生理学学术大会

作者： reji Babygirija Kirk Ludwig Toku Takahashi Department of Surgery Medical College of Wisconsin

＜正＞Background:In our daily life,individuals encounter with various types of stress（chronic stress）, which often causes gastrointestinal（GI） symptoms and functional *** some can adapt toward chronic stress,the adaptation mechanism against chronic stress remains *** the effects of chronic stress on gastric motility still remain ***:We investigated the effects of acute（single stress） and chronic stress （repeated restraint stress） on solid gastric emptying and interdigestive gastroduodenal contractions in *** mRNA expression in hypothalamus were studied by real-time PCR following chronic *** evaluate the effects of chronic stress on HPA axis,plasma corticosterone levels were *** investigate whether the sensitivity to central CRF is altered following chronic stress,CRF was administered intracisternally（ic）.The changes in plasma active ghrelin levels and mRNA expression in stomach were studied following chronic ***: Delayed gastric emptying observed in acute stress was completely restored following chronic stress,the restored gastric emptying was antagonized by the administration of ghrelin receptor *** stress abolished gastric phaseⅢ-like contractions in the interdigestive *** gastric phaseⅢ-like contractions were also restored following chronic *** plasma levels and mRNA expression were also significantly increased. Ic-injection of CRF delayed gastric emptying and impaired interdigestive gastric motility in rats those received chronic *** CRF mRNA expression in the hypothalamus in response to acute stress was significantly reduced following chronic ***,increased plasma corticosterone concentrations in response to acute stress were no more ***:It is suggested that the adaptation mechanism against chronic stress may involve upregulation of gastric ghrelin expression and attenuation of HPA *** contrast,the sensitivity to central CRF

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中国激光 1993年第7期20卷 530-535页

作者：朱允明张人佶窦建清梁绵长清华大学机械工程系北京100084

本文用X射线衍射法研究了45号钢基体上镍基热喷涂层经激光熔凝处理后的残余应力。

关键词：激光熔凝镍基热喷涂层残余应力

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叶城县沙尘类天气的变化趋势及其成因分析

现代农业研究 2020年第12期26卷 141-142页

作者：司马义·热吉迪力努尔热依木新疆维吾尔自治区喀什地区叶城县气象局新疆喀什844900

本文选取1971~2019年叶城县逐月沙尘暴、扬沙、浮尘、大风日数资料,对叶城县近49年来的沙尘类天气变化趋势及其成因进行分析。

关键词：叶城县沙尘类天气变化趋势成因

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