Genetic Divergence in Guinea grass (\u3cem\u3ePanicum maximum\u3c/em\u3e Jacq.)

Guinea grass is ideal forage crop and grows well on a wide variety of soil and even under light shade of tree and bushes and can survive long dry spell and quick moving fires which does not harm underground root. In order to improve productivity, adaptability and quality of Guinea grass, it is important to understand the genetic diversity which exists in the population which also helps in their conservation and germplasm management (Tiwari and Chandra, 2010). The present study was undertaken to estimate the amount of diversity among 37 germplasm accessions (Panicum maximum Jacq.) and to identify diverse genotypes for breeding programmes for better yield and quality

Preparation of unsymmetrical ketones from tosylhydrazones and aromatic aldehydes via formyl C–H bond insertion

Preparation of ketones by insertion of diazo compounds into the formyl C−H bond of an aldehyde is an attractive procedure, but use of structurally diverse diazo compounds is hampered by preparation and safety issues. A convenient procedure for the synthesis of unsymmetrical ketones from bench-stable tosylhydrazones and aryl aldehydes is reported. The procedure can be performed in one pot from the parent carbonyl compound and needs only a base, with no additional promoters being required

Mitigation Of Voltage Sag Using Dvr

Power quality is one of the major concerns in the era of power system. Power quality problem occurred due to non- standard voltage, current or frequency, that result in a failure of end user equipment. To overcome this problem, Dynamic Voltage Restorer (DVR) is used, which eliminate voltage sag. This paper narrates the application of DVR to optimize the power quality problems such as voltage sag,The DVR is a power electronics based device that is commonly for voltage sagmitigation at the point of connection. A control technique based on a proportional (P) controller is implemented. In fact with the aid of Pulse width modulation (PWM) inverters capable of generating accurate high quality voltage waveforms from the power electronic device. Simulation results shows the effectiveness of proposed method by MATLAB

Wolff rearrangement of α-diazoketones using in situ generated silver nanoclusters as electron mediators

The passivating behavior of self-assembled monolayers (SAMs) of octadecyltrichlorosilane (OTS) on an n-type Si(100) electrode with and without a redox species like ferrocene in a polar non-aqueous medium has been investigated using techniques like contact angle measurements, Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS) to understand the role of the monolayer. The electron-transfer behavior of ferrocene is found to be drastically affected by the presence of monolayer and the reasons for these are analyzed as a function of the change in resistance, dielectric thickness and coverage of the monolayer. Electrochemical impedance analysis in the presence of ferrocene gives the monolayer coverage as 0.998 and the apparent rate constant calculated from this gives 4.85 × 10<SUP>-12</SUP> cms<SUP>-1</SUP> source in comparison with 4.4 × 10<SUP>-8</SUP> cms<SUP>-1</SUP> for a similar electrode without any monolayer. A positive shift of 200 mV in the flat-band potential after monolayer formation also suggests the covalent coupling of the silane monolayer offering a protective barrier