Advanced Communication Technology International Conference, 2008
Abstract The loss of confidential data results adversary effect while transmission in sensor netw... more Abstract The loss of confidential data results adversary effect while transmission in sensor network. The whole sensor network is then prone to get exposed to the intruder. Hence we need a strong mechanism, rather a hardware oriented solution to protect such sensitive ...
Several factors affect a student's success in the classroom, includi... more Several factors affect a student's success in the classroom, including group identity, preconceptions, self-efficacy, self-confidence, and motivation orientation. This paper describes a study focusing on motivation orientation and its affect on participation and perceptions ...
Abstract. We present the results of a study in which we contrast alternative forms of collaborati... more Abstract. We present the results of a study in which we contrast alternative forms of collaborative learning support in the midst of a collaborative design task in which students negotiate between increasing power and increasing environmental friendliness. Our research question is ...
Oxalobacter formigenes is a bacterium residing in the human gastrointestinal tract that degrades ... more Oxalobacter formigenes is a bacterium residing in the human gastrointestinal tract that degrades oxalate and reduces its availability for absorption. This bacterium is assumed to be antibiotic sensitive, and repeated antibiotic therapies could eradicate it. The aim of the present study was to determine the differences in the colonization by O. formigenes of individuals who had been on antibiotics for at least 5 days at the time of sample collection and individuals who had not taken antibiotics for at least 3 months. Stool samples were collected from 80 individuals without stone disease (35 with and 45 without antibiotic consumption) and 100 patients with stone disease (20 with and 80 without antibiotic consumption). Oxalobacter formigenes was detected by a polymerase chain reaction-based method, and the presence/absence of O. formigenes was correlated with urinary oxalate concentrations. Lower percentages of individuals without stone disease and with stone disease who were consuming antibiotics had O. formigenes colonization than individuals without antibiotic consumption. Urinary oxalate concentrations were higher in the individuals without O. formigenes than in colonized individuals. Our observations confirm a direct association between antibiotic consumption and absence of O. formigenes. Absence of intestinal O. formigenes could represent a pathogenic factor in calcium oxalate urolithiasis when antibiotics are prescribed generously.
This article presents an investigation of the machining parameters design for electro-discharge d... more This article presents an investigation of the machining parameters design for electro-discharge diamond face grinding (EDDFG). The setup for EDDFG was developed, and experiments were conducted on tungsten carbide cobalt (WC-10wt%Co) composite workpiece. The input machining parameters used in the present study were wheel speed, current, pulse on time, and duty factor. The settings of machining parameters were determined by using Taguchi's robust design approach. The machining parameters were optimized with multiresponse characteristics of material removal rate (MRR), wheel wear rate (WWR), and average surface roughness (ASR). Multiresponse signal-to-noise (MSNR) ratio was applied to measure the performance characteristics deviating from the actual value. Analysis of variance (ANOVA) was employed to identify the level of importance of the machining parameters on the multiple performance characteristics considered. Finally, experimental confirmation was carried out to identify the effectiveness of this proposed method.
Vortex-Induced Vibration (VIV) is a possible phenomenon in situations where a bluff body interact... more Vortex-Induced Vibration (VIV) is a possible phenomenon in situations where a bluff body interacts with a fluid flow. There are many potential areas where this phenomenon could be observed such as in heat exchanger tube bundles, marine structures, bridges, power transmission lines etc. Due to VIV, the structures could be subjected to very large transverse vibrations which may lead to
ELETTRA (http://www.elettra.trieste.it/index.html) is a third generation synchrotron radiation so... more ELETTRA (http://www.elettra.trieste.it/index.html) is a third generation synchrotron radiation source facility operating at Trieste, Italy, and hosts a wide range of research activities in advanced materials analysis and processing, biology and nano-science at several various beam lines. The energy spectrum of ELETTRA allows x-ray nano-lithography using soft (1.5 keV) and hard x-ray (10 keV) wavelengths. The Laboratory for Interdisciplinary Lithography (LIILIT)
ABSTRACT Shubnikov-de Haas and persistent photoconductivity measurements have been performed as a... more ABSTRACT Shubnikov-de Haas and persistent photoconductivity measurements have been performed as a function of hydrostatic pressure to study the saturation of the free electron concentration and the mobilities of the individual subbands at high doping densities in very thin sheets (2, 5, 10 nm) of silicon donors in MBE GaAs. The samples were grown at very low temperature (400 degrees C) in order to limit dopant diffusion, and silicon concentrations were close to the solubility limit at this temperature. As has been shown previously with spike-doped GaAs(Si), the relative occupancies and the mobilities of the lower subbands are very sensitive to the spreading of the dopant distribution. A routine was developed for the analysis of the Fourier transforms of the complex pattern of Shubnikov-de Haas peaks in order to provide quantitative values for the mobilities of the individual subbands. The results of this analysis are compared with values deduced from the magnetic field dependence of the resistivity and Hall effect. On applying hydrostatic pressures of the order of 15 kbar in the dark, a decrease of the free electron concentration of a factor of two was observed. This was accompanied by an increase in the mobility of all the subbands due to the change in the charge state of the silicon donors in the doping slab. With the two thinnest slabs the mobility at ambient pressure is so low in the i=0 subband that Shubnikov-de Haas peaks from this subband could not be detected at fields up to 15 T, although strong peaks could be observed from the higher order subbands. After illumination of the thinnest sample at high pressure the measured free electron concentration is not restored to the zero pressure value. One possibility is that the missing electrons occupy a localized non-metastable Si state resonant with the conduction band rather than a DX centre. The pressure coefficient of the carrier density yields an extrapolated position for the energy level for the Si localized state of 270+or-10 meV above the Gamma -conduction band edge at ambient pressure.
This paper weighs the implications of Second Language Acquisition (SLA) research and practice for... more This paper weighs the implications of Second Language Acquisition (SLA) research and practice for Speech and Language Technology in Education (SLaTE). It describes the different psychological processes of implicit learning, explicit learning, and explicit instruction, and reviews educational research into the benefits and limitations of each. It considers how SLA differs from first language acquisition and, therefore, why implicit learning from usage does not suffice for SLA. It outlines the range of types of knowledge ...
Advanced Communication Technology International Conference, 2008
Abstract The loss of confidential data results adversary effect while transmission in sensor netw... more Abstract The loss of confidential data results adversary effect while transmission in sensor network. The whole sensor network is then prone to get exposed to the intruder. Hence we need a strong mechanism, rather a hardware oriented solution to protect such sensitive ...
Several factors affect a student's success in the classroom, includi... more Several factors affect a student's success in the classroom, including group identity, preconceptions, self-efficacy, self-confidence, and motivation orientation. This paper describes a study focusing on motivation orientation and its affect on participation and perceptions ...
Abstract. We present the results of a study in which we contrast alternative forms of collaborati... more Abstract. We present the results of a study in which we contrast alternative forms of collaborative learning support in the midst of a collaborative design task in which students negotiate between increasing power and increasing environmental friendliness. Our research question is ...
Oxalobacter formigenes is a bacterium residing in the human gastrointestinal tract that degrades ... more Oxalobacter formigenes is a bacterium residing in the human gastrointestinal tract that degrades oxalate and reduces its availability for absorption. This bacterium is assumed to be antibiotic sensitive, and repeated antibiotic therapies could eradicate it. The aim of the present study was to determine the differences in the colonization by O. formigenes of individuals who had been on antibiotics for at least 5 days at the time of sample collection and individuals who had not taken antibiotics for at least 3 months. Stool samples were collected from 80 individuals without stone disease (35 with and 45 without antibiotic consumption) and 100 patients with stone disease (20 with and 80 without antibiotic consumption). Oxalobacter formigenes was detected by a polymerase chain reaction-based method, and the presence/absence of O. formigenes was correlated with urinary oxalate concentrations. Lower percentages of individuals without stone disease and with stone disease who were consuming antibiotics had O. formigenes colonization than individuals without antibiotic consumption. Urinary oxalate concentrations were higher in the individuals without O. formigenes than in colonized individuals. Our observations confirm a direct association between antibiotic consumption and absence of O. formigenes. Absence of intestinal O. formigenes could represent a pathogenic factor in calcium oxalate urolithiasis when antibiotics are prescribed generously.
This article presents an investigation of the machining parameters design for electro-discharge d... more This article presents an investigation of the machining parameters design for electro-discharge diamond face grinding (EDDFG). The setup for EDDFG was developed, and experiments were conducted on tungsten carbide cobalt (WC-10wt%Co) composite workpiece. The input machining parameters used in the present study were wheel speed, current, pulse on time, and duty factor. The settings of machining parameters were determined by using Taguchi's robust design approach. The machining parameters were optimized with multiresponse characteristics of material removal rate (MRR), wheel wear rate (WWR), and average surface roughness (ASR). Multiresponse signal-to-noise (MSNR) ratio was applied to measure the performance characteristics deviating from the actual value. Analysis of variance (ANOVA) was employed to identify the level of importance of the machining parameters on the multiple performance characteristics considered. Finally, experimental confirmation was carried out to identify the effectiveness of this proposed method.
Vortex-Induced Vibration (VIV) is a possible phenomenon in situations where a bluff body interact... more Vortex-Induced Vibration (VIV) is a possible phenomenon in situations where a bluff body interacts with a fluid flow. There are many potential areas where this phenomenon could be observed such as in heat exchanger tube bundles, marine structures, bridges, power transmission lines etc. Due to VIV, the structures could be subjected to very large transverse vibrations which may lead to
ELETTRA (http://www.elettra.trieste.it/index.html) is a third generation synchrotron radiation so... more ELETTRA (http://www.elettra.trieste.it/index.html) is a third generation synchrotron radiation source facility operating at Trieste, Italy, and hosts a wide range of research activities in advanced materials analysis and processing, biology and nano-science at several various beam lines. The energy spectrum of ELETTRA allows x-ray nano-lithography using soft (1.5 keV) and hard x-ray (10 keV) wavelengths. The Laboratory for Interdisciplinary Lithography (LIILIT)
ABSTRACT Shubnikov-de Haas and persistent photoconductivity measurements have been performed as a... more ABSTRACT Shubnikov-de Haas and persistent photoconductivity measurements have been performed as a function of hydrostatic pressure to study the saturation of the free electron concentration and the mobilities of the individual subbands at high doping densities in very thin sheets (2, 5, 10 nm) of silicon donors in MBE GaAs. The samples were grown at very low temperature (400 degrees C) in order to limit dopant diffusion, and silicon concentrations were close to the solubility limit at this temperature. As has been shown previously with spike-doped GaAs(Si), the relative occupancies and the mobilities of the lower subbands are very sensitive to the spreading of the dopant distribution. A routine was developed for the analysis of the Fourier transforms of the complex pattern of Shubnikov-de Haas peaks in order to provide quantitative values for the mobilities of the individual subbands. The results of this analysis are compared with values deduced from the magnetic field dependence of the resistivity and Hall effect. On applying hydrostatic pressures of the order of 15 kbar in the dark, a decrease of the free electron concentration of a factor of two was observed. This was accompanied by an increase in the mobility of all the subbands due to the change in the charge state of the silicon donors in the doping slab. With the two thinnest slabs the mobility at ambient pressure is so low in the i=0 subband that Shubnikov-de Haas peaks from this subband could not be detected at fields up to 15 T, although strong peaks could be observed from the higher order subbands. After illumination of the thinnest sample at high pressure the measured free electron concentration is not restored to the zero pressure value. One possibility is that the missing electrons occupy a localized non-metastable Si state resonant with the conduction band rather than a DX centre. The pressure coefficient of the carrier density yields an extrapolated position for the energy level for the Si localized state of 270+or-10 meV above the Gamma -conduction band edge at ambient pressure.
This paper weighs the implications of Second Language Acquisition (SLA) research and practice for... more This paper weighs the implications of Second Language Acquisition (SLA) research and practice for Speech and Language Technology in Education (SLaTE). It describes the different psychological processes of implicit learning, explicit learning, and explicit instruction, and reviews educational research into the benefits and limitations of each. It considers how SLA differs from first language acquisition and, therefore, why implicit learning from usage does not suffice for SLA. It outlines the range of types of knowledge ...
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