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Additional Inspection of Nurseries on Account of the European Pine Shoot Moth
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The transformation of European football: towards the Europeanisation of the national game
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레기스 신부의 라틴어 《역경(易經)》에 대하여
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고향을 지키며 늘 배우고 실천하는 행복한 농부를 꿈꾼다
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Laminar and turbulent flow in water
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Kumada Rearrangement of Polydimethylsilane Using a Catalytic Process
- 검색키워드
- 저자 : S. Venkatachalam (검색결과 4 건)
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Venkatachalam, P.,Geetha, N.,Jayabalan, N.,Saravanababu, S. 한국식물학회 1998 Journal of Plant Biology Vol.41 No.4
Cell suspensions derived from immature leaves of the groundnut (Arachis hypogaea L.) were cultured in the presence and absence of Cercosporidium personation pathotoxic culture filtrates. Cell viability and reactions of cell lines were determined after exposure to various concentrations (25-100%, v/v) of the filtrates. Cell lines have been selected for resistance to the toxin(s) produced by C. personatum. Selected cell lines were used for plant regeneration on regeneration media containing C. personatum culture filtrates. Plant regeneration frequency was found to be low in long-term cultures, whereas it was high in short-term cultures. The selfed progeny of the plants regenerated from the resistant cell lines showed resistance to the pathogen in the field. Six out of 82 plants exhibited enhanced resistance in the R_2 generation. The culture filtrate stimulated callus proliferation as well as plant regeneration at lower concentrations, a response that could prove to be very useful for obtaining disease resistant plants through in vitro selection.
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Preparation and characterization of nano and microcrystalline ZnO thin films by PLD
S. Venkatachalam,Yoshinori Kanno 한국물리학회 2009 Current Applied Physics Vol.9 No.6
Nano and microcrystalline ZnO thin films were prepared on glass substrates using pulsed laser deposition technique under a vacuum of 3 × 10-7 Torr at different laser power density. Composition analyses show that the films deposited at low laser power density have more structural defects than the film deposited at high laser power density. It confirms that the content of Zn in free-state decreased greatly at high laser power density. Atomic force microscopy analysis shows that the surface roughness of the deposited films increases with an increase in laser power density. X-ray diffraction analyses show that all the films are oriented along (002) direction independently on the laser power density applied. The structural quality increases with an increase in laser power density. It is due to the fact that the increase of laser power density leads to the enhancement of peak intensity. The increase of laser power density reduces the film transmission in the visible range of the spectra. The optical band gap value is found to be in the range from 3.42 to 3.39 eV. It shows that the optical band gap value decreases with an increase in laser power density. FTIR analysis shows that the hydrated oxide content in the deposited films decreases with an increase in laser power density. Nano and microcrystalline ZnO thin films were prepared on glass substrates using pulsed laser deposition technique under a vacuum of 3 × 10-7 Torr at different laser power density. Composition analyses show that the films deposited at low laser power density have more structural defects than the film deposited at high laser power density. It confirms that the content of Zn in free-state decreased greatly at high laser power density. Atomic force microscopy analysis shows that the surface roughness of the deposited films increases with an increase in laser power density. X-ray diffraction analyses show that all the films are oriented along (002) direction independently on the laser power density applied. The structural quality increases with an increase in laser power density. It is due to the fact that the increase of laser power density leads to the enhancement of peak intensity. The increase of laser power density reduces the film transmission in the visible range of the spectra. The optical band gap value is found to be in the range from 3.42 to 3.39 eV. It shows that the optical band gap value decreases with an increase in laser power density. FTIR analysis shows that the hydrated oxide content in the deposited films decreases with an increase in laser power density.
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Kannan, S.,Venkatachalam, G.,Lee, H.J.,Min, B.K.,Kim, W.,Koo, E.,Do, Y.R.,Yoon, S. Pergamon Press 2011 Polyhedron Vol.30 No.2
The metal coordination geometry in the active site of metalloproteins are very different from the one of small inorganic complexes, due to the inflexibility of the ligand set from amino acid side chains different from freely moving ligand set in synthesis. Using the sterically hindered 2,6-di-(p-fluorophenyl)benzoate(L) ligand, a series of mononuclear Co(II), Ni(II) and Cu(II) complexes of general formula [M(L)<SUB>2</SUB>(Hdmpz)<SUB>2</SUB>] (where, Hdmpz=3,5-dimethyl pyrazole) have been synthesized and characterized by the variety of spectroscopic methods. A distorted octahedral geometry in case of nickel, tetrahedral geometry for cobalt and square pyramidal in copper was observed in the X-ray studies, which also revealed that the uncoordinated oxygen atom of the carboxylate group forms intramolecular hydrogen bonding with the N-H group of the coordinated 3,5-dimethylpyrazole in case of cobalt and copper.
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Performance of leaf springs made of composite material subjected to low frequency impact loading
S. Rajesh,G. B. Bhaskar,J. Venkatachalam,K. Pazhanivel,Suresh Sagadevan 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.9
This paper illustrates the possibility of replacing existing conventional steel-leaf spring by the leaf spring made by tailoring the layup of composite laminates. The dimensions of the existing conventional middle leaf (spring) of a commercial vehicle were chosen for the design and manufacture of die for moulding the composite leaves. Accordingly, suspension springs of composites of different layups with glass and carbon were fabricated and tested for flexure response. It is to be noted here that the cross sectional area of the composite leaf spring was the same as of the conventional leaf spring. By using universal testing machine, load per deflection and maximum load for each of the composite leaf springs were evaluated. Apart from these, the specimens were exposed to low frequency impact loading with specific duration of cycles and subsequently the flexure response was also evaluated. The low frequency impact on the composite leafs was effected with a laboratory loading set-up in a milling machine. Experimental results indicated the superior flexure response of the hybrid composites (with glass fiber at starting phase and carbon fiber at the end) and suggested possible alternative on comparison with the conventional spring.
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