Showing papers by "Techno India published in 1995"
TL;DR: In this article, a new current-conveyor-based (CC) biquad, equivalent to the well known KHN circuit, is introduced, which employs exactly the same number of CCs and resistors (six/seven) along with two grounded capacitors as in the two CC biquads recently reported by Soliman.
Abstract: A new current-conveyor-based (CC) biquad, equivalent to the well known KHN circuit, is introduced. The proposed circuit employs exactly the same number (five) of CCs and resistors (six/seven) along with two grounded capacitors as in the two CC biquads recently reported by Soliman. However, in contrast to Soliman's circuits, the proposed biquad offers several other advantages.
86 citations
TL;DR: A number of importance sampling schemes for improving the computation of flux estimation by using approximately computed potential for directing a majority of the random walks through regions of importance in the environment, thus reducing the variance in the estimates of luminous flux in these regions.
Abstract: In this paper we introduce the potential equation that along with the rendering equation forms an adjoint system of equations and provides a mathematical frame work for all known approaches to illumination computation based on geometric optics. The potential equation is more natural for illumination computations that simulate light propagation starting from the light sources, such as progressive radiosity and particle tracing. Using the mathematical handles provided by this framework and the random-walk solution model, we present a number of importance sampling schemes for improving the computation of flux estimation. Of particular significance is the use of approximately computed potential for directing a majority of the random walks through regions of importance in the environment, thus reducing the variance in the estimates of luminous flux in these regions. Finally, results from a simple implementation are presented to demonstrate the high-efficiency improvements made possible by the use of these techniques.
57 citations
TL;DR: In this paper, the authors reported the existence of a 1D shock wave profile for a weakly nonlinear modified acoustic-like/dust-acoustic waves. But unlike in the conventional plasma systems, the dissipative effect to balance the nonlinear steepening arises self-consistently due to dust charge fluctuation dynamics in response to the collective plasma oscillations.
Abstract: The present investigation reports the existence of a one‐dimensional (1‐D) shock wave profile for a weakly nonlinear modified acoustic‐like/dust‐acoustic waves. Here, unlike in the conventional plasma systems, the dissipative effect to balance the nonlinear steepening arises self‐consistently due to dust charge fluctuation dynamics in response to the collective plasma oscillations. The possibility of other localized coherent structures like dissipative/dispersive solitons in higher‐order solutions has been highlighted. Its implications in laboratory and space plasmas are discussed.
33 citations
TL;DR: The proposed approach, a technique for generation of precedence graphs for each transaction execution is analyzed and is free from deadlocks, and avoids resubmission of transactions.
Abstract: Replicated data management systems adopt the 1-copy serializability criteria for processing transactions. In order to achieve this goal, many approaches rely on obtaining votes from other sites for processing update requests. In the proposed approach, a technique for generation of precedence graphs for each transaction execution is analyzed. The transaction data flow graph approach is a fully distributed approach. The proposed technique, is free from deadlocks, and avoids resubmission of transactions. >
17 citations
TL;DR: In this paper, the authors present a configuration for realising a floating generalised negative impedance converter/inverter (GNIC/GNII) which employs no more than a single OMA along with a minimum of three passive components.
Abstract: In contrast to the previously known circuits which require two to four op-amps, current conveyors (CC) or operational mirrored amplifiers (OMAs) to realise a floating negative impedance converter, the Letter presents a configuration for realising a floating generalised negative impedance converter/inverter (GNIC/GNII) which employs no more than a single OMA along with a minimum of three passive components (without requiring any passive-component-matching). An application example is demonstrated. The workability of the proposed structures has been confirmed by SPICE simulations.
17 citations
TL;DR: The results suggest that PRA II might be involved in recognition ofRhizobium by peanut roots, and Lipopolysaccharides isolated from host-specificRhZobium strain inhibit the haemagglutinating activity of PRA I and are precipitated by the lectin.
Abstract: The glucose-specific peanut root lectin, PRA II, is localized on the surface of 7-day-old peanut seedling root and in root cortical parenchymatous cells. The lectin is eluted from intact roots upon washing with buffer containing glucose. Rabbit erythrocytes bind to the root surface and the cortical cells; the binding is inhibited by antibodies raised against PRA II, peanut-specificRhizobium cells and by glucose. Lipopolysaccharides isolated from host-specificRhizobium strain inhibit the haemagglutinating activity of PRA II and are precipitated by the lectin. Our results suggest that PRA II might be involved in recognition ofRhizobium by peanut roots.
15 citations
15 Mar 1995
TL;DR: A model to keep track of state dependencies using dependency graphs has been proposed and is proposed for distributed systems use optimistic message logging for recovery from transient process failures.
Abstract: Distributed systems use optimistic message logging for recovery from transient process failures. Such a recovery is facilitated by asynchronous message logging and check-pointing. It is also supported by garbage collection which requires identifying messages in stable storage that are no longer needed for the process of recovery. For this purpose, it is necessary to keep track of message dependencies between process states. A model to keep track of state dependencies using dependency graphs has been proposed. >
8 citations
01 Jun 1995
TL;DR: In this article, the authors propose a universal linear VCZ configuration, which can be used to realize positive and negative linear VVCZs from the same structure by changing only one interconnection.
Abstract: Introduces a new configuration that possesses the novel feature of realising positive as well as negative linear VCZs from the same structure by the simple artifice of changing only one interconnection, and hence can be called a universal VCZ configuration Two different and separate structures for realising positive and negative linear VCZs are no longer required The proposed configuration not only employs fewer components than previously reported VCZ structures but also is functionally more versatile than all of them
8 citations
03 Mar 1995
TL;DR: The average severance energy (P/vt, P = laser power, v = cutting speed, t = thickness) for marble was approximately found to be 9.0 J/mm2 as discussed by the authors.
Abstract: In this paper we present results of marble cutting with high power CO2 laser. The dependence of various parameters such as thickness of marble, laser power, cutting speed, assist gas and its pressure on cutting process was studied. Structural properties of marble like crystal size have been found to affect the cut quality. The average severance energy (P/vt, P = laser power, v = cutting speed, t = thickness) for marble was approximately found to be 9.0 J/mm2. This agrees very closely with the calculated value based on energy balance.
6 citations
13 Oct 1995
TL;DR: In this article, the authors present a list of approximately 35,000 assigned transitions from the microwave to the mid-infrared regions of the electromagnetic spectrum for more than 50 years.
Abstract: The methanol spectrum has been the subject of extensive studies in the microwave, far- infrared, and infrared regions of the electromagnetic spectrum for more than 50 years. The complexity of the spectrum, and the very high quality of the current data lead us to present in a single book all the available spectroscopic information in the regions of broadest interest. Our atlas, currently in press, presents a list of approximately 35,000 assigned transitions from the microwave to the mid-infrared region. The line positions are reported with the current achievable accuracy, and approximate peak intensities are given in this work for the first time. Many new assignments of absorption transitions are presented in this atlas for the first time. The optically pumped methanol laser is introduced, and a list of all the 576 currently known optically pumped FIR laser lines with their quantum number assignments, so far as they are known, are included. The energies of almost 7000 levels, calculated by the Rydberg-Rits combination principle, and the Taylor expansion coefficients for the energy levels are presented. The complete plot of the absorption spectrum from 28 to 1258 cm-1 is given.© (1995) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
5 citations
Journal Article•
TL;DR: Serum and erythrocyte magnesium levels were significantly lower in both boys and girls from low socio-economic groups who also had lower body mass indices and Body mass indices were used as indirect measures of nutritional status.
Abstract: BACKGROUND Magnesium is required in higher quantities, during the phase of rapid growth, in children. Its level in the ground water in Kerala is low. This can cause magnesium deficiency especially in children from the lower socio-economic groups who also suffer from nutritional insufficiency. METHODS We compared the serum and erythrocyte magnesium levels of school children from high and low (agricultural labourers and fisherfolk) socio-economic groups. These levels were determined using atomic absorption spectrophotometry. Body mass indices and haemoglobin levels were used as indirect measures of nutritional status. RESULTS Serum and erythrocyte magnesium levels were significantly lower in both boys and girls from low socio-economic groups who also had lower body mass indices. CONCLUSION Nutritional insufficiency is prevalent in children from the low socio-economic groups and is associated with low serum and erythrocyte magnesium levels.
15 Mar 1995
TL;DR: The proposed approach, a technique for generation of data flow precedence graphs among transactions at data sites has been studied and it is shown that through local computations, the approach can prevent deadlocks in a distributed system.
Abstract: Concurrency control based on conventional techniques requires additional efforts for deadlock detection and elimination. The possibility of a deadlock is also connected to the introduction of delays, and repeated restarts of transactions in deadlock cycles. In the proposed approach, a technique for generation of data flow precedence graphs among transactions at data sites has been studied. The local access graph approach is a fully distributed approach. Through local computations, the approach can prevent deadlocks in a distributed system. >
15 Feb 1995
TL;DR: The effects of 9.801 GHz microwaves modulated with 1 kHz square wave on chlorophyll content of dry and wet pigeonpea and mungbean have been studied and seeds of experimental groups were exposed to modulated microwave for 60 min.
Abstract: The effects of 9.801 GHz microwaves modulated with 1 kHz square wave on chlorophyll content of dry and wet pigeonpea (cv.T21) and mungbean (cv.PS16) have been studied. Seeds of experimental groups were exposed to modulated microwave for 60 min at 1.373 and 3.462 MW/cm/sup 2/ power densities.