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Search Results: 1 - 10 of 555496 matches for " A. K. Dave "
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Some Preliminary Metallurgical Studies on Grain Size and Density of Work Material used in Micro Turning Operation  [PDF]
A. S. Patil, H. K. Dave, R. Balasubramaniam, K. P. Desai, H. K. Raval
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2010, DOI: 10.4236/jmmce.2010.99061
Abstract: One important process in tool based micro machining technology is CNC micro turning which has the capability to produce 3D structures on micro scale. The major drawback of micro turning process is that the machining force influences machining accuracy and the limit of machinable size and shape. Therefore, the control of reactive force during cutting is an important factor in improving machining accuracy. The properties of work material significantly affect the cutting force generated during turning process. Commercially available metal rods are inhomogeneous and hence, qualifying the right material is very crucial in micro turning. Unlike plates, the properties like grain size and density vary significantly at different locations of the round bars. Hence, it is found very important to systematically find right material for micro turning from the commercially available rods. In present study, an attempt has been made to study the grain size and density of blank material from different locations of a larger diameter shaft. The work material selected is a 32 mm diameter shaft of commercial brass, a non ferrous alloy of copper and zinc. Five samples from different radial locations are cut from this shaft. It is found that grains are coarser at centre and finer towards the periphery of the shaft. Further, local density is less at centre and high at periphery of the shaft.
Maize microarray annotation database
Nanette Coetzer, Alexander A Myburg, Dave K Berger
Plant Methods , 2011, DOI: 10.1186/1746-4811-7-31
Abstract: Genomic annotation of the 42,034 reporters on the Agilent-016047 maize microarray was based on BLASTN results of the 60-mer reporter sequences and their corresponding ESTs against the maize B73 RefGen v2 "Working Gene Set" (WGS) predicted transcripts and the genome sequence. The agreement between the EST, WGS transcript and gDNA BLASTN results were used to assign the reporters into six genomic annotation groups. These annotation groups were: (i) "annotation by sense gene model" (23,668 reporters), (ii) "annotation by antisense gene model" (4,330); (iii) "annotation by gDNA" without a WGS transcript hit (1,549); (iv) "annotation by EST", in which case the EST from which the reporter was designed, but not the reporter itself, has a WGS transcript hit (3,390); (v) "ambiguous annotation" (2,608); and (vi) "inconclusive annotation" (6,489). Functional annotations of reporters were obtained by BLASTX and Blast2GO analysis of corresponding WGS transcripts against GenBank.The annotations are available in the Maize Microarray Annotation Database http://MaizeArrayAnnot.bi.up.ac.za/ webcite, as well as through a GBrowse annotation file that can be uploaded to the MaizeGDB genome browser as a custom track.The database was used to re-annotate lists of differentially expressed genes reported in case studies of published work using the Agilent-016047 maize microarray. Up to 85% of reporters in each list could be annotated with confidence by a single gene model, however up to 10% of reporters had ambiguous annotations. Overall, more than 57% of reporters gave a measurable signal in tissues as diverse as anthers and leaves.The Maize Microarray Annotation Database will assist users of the Agilent-016047 maize microarray in (i) refining gene lists for global expression analysis, and (ii) confirming the annotation of candidate genes before functional studies.Currently, there are several maize microarray platforms available, including an Affymetrix short oligonucleotide array [1], a Nim
Universal Fault-Tolerant Computation on Decoherence-Free Subspaces
Dave Bacon,Julia Kempe,Daniel A. Lidar,K. B. Whaley
Physics , 1999, DOI: 10.1103/PhysRevLett.85.1758
Abstract: A general scheme to perform universal quantum computation within decoherence-free subspaces (DFSs) of a system's Hilbert space is presented. This scheme leads to the first fault-tolerant realization of universal quantum computation on DFSs with the properties that (i) only one- and two-qubit interactions are required, and (ii) the system remains within the DFS throughout the entire implementation of a quantum gate. We show explicitly how to perform universal computation on clusters of the four-qubit DFS encoding one logical qubit each under "collective decoherence" (qubit-permutation-invariant system-bath coupling). Our results have immediate relevance to a number of solid-state quantum computer implementations, in particular those in which quantum logic is implemented through exchange interactions, such as the recently proposed spin-spin coupled GaAs quantum dot arrays and the Si:$^{31}$P nuclear spin arrays.
Theory of Decoherence-Free Fault-Tolerant Universal Quantum Computation
Julia Kempe,Dave Bacon,Daniel A. Lidar,K. Birgitta Whaley
Physics , 2000, DOI: 10.1103/PhysRevA.63.042307
Abstract: Universal quantum computation on decoherence-free subspaces and subsystems (DFSs) is examined with particular emphasis on using only physically relevant interactions. A necessary and sufficient condition for the existence of decoherence-free (noiseless) subsystems in the Markovian regime is derived here for the first time. A stabilizer formalism for DFSs is then developed which allows for the explicit understanding of these in their dual role as quantum error correcting codes. Conditions for the existence of Hamiltonians whose induced evolution always preserves a DFS are derived within this stabilizer formalism. Two possible collective decoherence mechanisms arising from permutation symmetries of the system-bath coupling are examined within this framework. It is shown that in both cases universal quantum computation which always preserves the DFS (*natural fault-tolerant computation*) can be performed using only two-body interactions. This is in marked contrast to standard error correcting codes, where all known constructions using one or two-body interactions must leave the codespace during the on-time of the fault-tolerant gates. A further consequence of our universality construction is that a single exchange Hamiltonian can be used to perform universal quantum computation on an encoded space whose asymptotic coding efficiency is unity. The exchange Hamiltonian, which is naturally present in many quantum systems, is thus *asymptotically universal*.
Decoherence-Free Subspaces for Multiple-Qubit Errors: (II) Universal, Fault-Tolerant Quantum Computation
Daniel A. Lidar,Dave Bacon,Julia Kempe,K. B. Whaley
Physics , 2000, DOI: 10.1103/PhysRevA.63.022307
Abstract: Decoherence-free subspaces (DFSs) shield quantum information from errors induced by the interaction with an uncontrollable environment. Here we study a model of correlated errors forming an Abelian subgroup (stabilizer) of the Pauli group (the group of tensor products of Pauli matrices). Unlike previous studies of DFSs, this type of errors does not involve any spatial symmetry assumptions on the system-environment interaction. We solve the problem of universal, fault-tolerant quantum computation on the associated class of DFSs.
Decoherence-Free Subspaces for Multiple-Qubit Errors: (I) Characterization
Daniel A. Lidar,Dave Bacon,Julia Kempe,K. B. Whaley
Physics , 1999, DOI: 10.1103/PhysRevA.63.022306
Abstract: Coherence in an open quantum system is degraded through its interaction with a bath. This decoherence can be avoided by restricting the dynamics of the system to special decoherence-free subspaces. These subspaces are usually constructed under the assumption of spatially symmetric system-bath coupling. Here we show that decoherence-free subspaces may appear without spatial symmetry. Instead, we consider a model of system-bath interactions in which to first order only multiple-qubit coupling to the bath is present, with single-qubit system-bath coupling absent. We derive necessary and sufficient conditions for the appearance of decoherence-free states in this model, and give a number of examples. In a sequel paper we show how to perform universal and fault tolerant quantum computation on the decoherence-free subspaces considered in this paper.
SND2, a NAC transcription factor gene, regulates genes involved in secondary cell wall development in Arabidopsis fibres and increases fibre cell area in Eucalyptus
Steven G Hussey, Eshchar Mizrachi, Antanas V Spokevicius, Gerd Bossinger, Dave K Berger, Alexander A Myburg
BMC Plant Biology , 2011, DOI: 10.1186/1471-2229-11-173
Abstract: We overexpressed SND2 in Arabidopsis and analyzed homozygous lines with regards to stem chemistry, biomass and fibre secondary cell wall thickness. A line showing upregulation of CesA8 was selected for transcriptome-wide gene expression profiling. We found evidence for upregulation of biosynthetic genes associated with cellulose, xylan, mannan and lignin polymerization in this line, in agreement with significant co-expression of these genes with native SND2 transcripts according to public microarray repositories. Only minor alterations in cell wall chemistry were detected. Transcription factor MYB103, in addition to SND1, was upregulated in SND2-overexpressing plants, and we detected upregulation of genes encoding components of a signal transduction machinery recently proposed to initiate secondary cell wall formation. Several homozygous T4 and hemizygous T1 transgenic lines with pronounced SND2 overexpression levels revealed a negative impact on fibre wall deposition, which may be indirectly attributable to excessive overexpression rather than co-suppression. Conversely, overexpression of SND2 in Eucalyptus stems led to increased fibre cross-sectional cell area.This study supports a function for SND2 in the regulation of cellulose and hemicellulose biosynthetic genes in addition of those involved in lignin polymerization and signalling. SND2 seems to occupy a subordinate but central tier in the secondary cell wall transcriptional network. Our results reveal phenotypic differences in the effect of SND2 overexpression between woody and herbaceous stems and emphasize the importance of expression thresholds in transcription factor studies.Plant fibres constitute a valuable renewable resource for pulp, paper and bioenergy production [1]. In angiosperms, the two principle sclerenchyma cell types that comprise secondary xylem are xylem vessels, which facilitate the transport of water, and xylary fibres, which provide mechanical strength and which make up the bulk of woody
Development of animal drawn rotary tiller
S. M. Nage,B. P. Mishra,A. K. Dave,J. S. Nikhade
Journal of Engineering and Applied Sciences , 2011,
Abstract: Rotary tiller generally refers to breaking down soil aggregates into ultimate soil particles. The degree of clod breaking depends on moisture content, tillage implements and intensity of clod breaking. One unit of animal drawn rotary tiller with L - shapes of blades was developed and fabricated at workshop of Faculty of Agricultural Engineering, Raipur. The effective field capacity of animal drawn rotary tiller (18 blades) was found 0.12 ha/h at a forward speed of 2.5 km/h. The field efficiency of 62.85% was observed during the field performance. The draft requirement of the developed animal drawn rotary tiller is 378 N. Mean Mass Diameter (MMD) of soil clod size was found 28.42 mm. The operational cost was found 384 Rs/ha.
Late Dr. (Mrs.) Dhanalakshmi De Sousa
K.P. Dave
Mens Sana Monographs , 2006,
Abstract: Dr. (Mrs.) Dhanalakshmi De Sousa was my senior colleague at K.E.M. Hospital during our post-graduate studies and at L.T.M.G. Hospital during our professional career as a staff member. I had an opportunity to be with her for about 18 years. As a Registrar at K.E.M., she appeared busy with her studies and sincere about her commitments. At L.T.M.G. Hospital, she worked in her initial years at the Child Guidance Clinic and was later promoted to adult psychiatry. She maintained a good relationship with patients and their relatives. She often went out of the way to seek social and economic help for the patients' welfare. When she became Chief after Dr. Bassa's retirement, she showed her genuine interest in the development of the Department of Psychiatry. She took great pains to get funds for equipments like EEG, ECT machines, and Behaviour Therapy instruments. She wanted to develop other diagnostic and treatment modalities which were not there during Dr. Bassa's tenure as chief. She made efforts to develop good relationship with other departments in the hospitals, and encouraged residents to do the same. Post-graduate teaching, nurses' education and research projects were the areas where she actively participated. Social activities like picnics and parties, which helped to improve interpersonal relationships, were a frequent feature during her tenure as Head. She contributed generously from her personal income to encourage under-graduates to take interest in Psychiatry. She started the 'Dr. De Sousa Award' for a competitive examination in Psychiatry for the under-graduates. We were surprised to find her asking for premature retirement from L.T.MG. Hospital as a staff member at a time when she was most needed. We came to know later it was to bring up her son, Avinash, now a Psychiatrist in his own right. A courageous, and probably wise, decision to take. We had less and less interaction with her after her retirement. But we always remembered her and quoted her during our academic post-graduate sessions in the Department. In her sad demise, we have lost a great soul who worked for the poor and the unfortunate. And a colleague with a great affection and love for people. May her soul rest in eternal peace.
Valid Consent for Genomic Epidemiology in Developing Countries
Dave A Chokshi ,Mahamadou A Thera,Michael Parker,Mahamadou Diakite,Julie Makani,Dominic P Kwiatkowski,Ogobara K Doumbo
PLOS Medicine , 2007, DOI: 10.1371/journal.pmed.0040095
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