High voltage (HV) level-shifters and logic gates tolerant to supply voltages higher than the proc... more High voltage (HV) level-shifters and logic gates tolerant to supply voltages higher than the process limit for individual CMOS transistors are proposed. The logic gates topology is based on the Differential Cascode Voltage Switch Logic (DCVSL). The proposed HV DCVSL level shifters are particularly useful when it is mandatory to ensure a specific behavior during out of the normal mode
This paper presents the experience gained at the Integration and Tests Laboratory—LIT, National I... more This paper presents the experience gained at the Integration and Tests Laboratory—LIT, National Institute for Space Research—INPE, in São José dos Campos, SP, from the thermal vacuum tests campaign of the SATEC protoflight spacecraft, held from February 6th to 12th, 2003. The Satélite Tecnológico (SATEC) is a micro-satellite made in Brazil, as a payload for the Brazilian launching vehicle VLS-1.3, scheduled to be launched in the year of 2003. Considering the small size, relatively small cost and limited responsibility of this particular micro-satellite, the environmental tests should be performed in a short period of time requiring as low cost as possible, albeit being reliable, comprehensive and representative. For the thermal vacuum tests basically it was used a medium-size space simulation chamber, complemented by the use of the technique of thermal radiant heat plates for simulation of the heat input from the orbital thermal conditioning. This paper details the infrared testing technique applied to the acceptance tests of the Brazilian micro-satellite, including the adopted test setup, the thermal vacuum chamber mode-of-operation and performance, the precise thermal conditioning and controlling of the radiative heat plates, and the results obtained in terms of spacecraft temperatures. SATEC was lost when the VLS-1 pre-ignited on pad during final launching procedures on 2003 August 22nd.
The paper investigates the provision of training to employees by accounting firms operating in Ri... more The paper investigates the provision of training to employees by accounting firms operating in Rio de Janeiro, Brazil. The main objectives are (a) to characterize the work environment; (b) to identify which types of training are provided, and (c) to test hypotheses about the impact of organizational characteristics on the provision of training. Data have been collected from a convenience sample of some 531 respondents to a postal survey that included about 3700 organizations registered in the regional professional council. The questionnaire comprised
Journal of Materials Science-materials in Medicine, 1996
Granules of a modified hydroxyapatite, glass-reinforced hydroxyapatite composite and commercial h... more Granules of a modified hydroxyapatite, glass-reinforced hydroxyapatite composite and commercial hydroxyapatite were implanted in rabbit tibiae. Histological studies were carried out after 1 and 2 months implantation periods using light and fluorescence microscopy. A much higher percentage of bone contact was developed for both the glass-reinforced hydroxyapatite composite and the modified hydroxyapatite when compared to commercial hydroxyapatite (89–91% versus 66%) after 2 months implantation. The mechanism of bone formation and growth around implants is discussed in terms of the influence of elements incorporated into these novel materials which are commonly found in bone tissues, such as Na, K and Mg, and the presence of a soluble β-tricalcium phosphate phase in the microstructure of the composite.
This publication is part of a major study (Thesis). In that thesis it was analyzed the intention ... more This publication is part of a major study (Thesis). In that thesis it was analyzed the intention of Pronaf's beneficiaries to repay the credit they have received. The Pronaf is a line of credit for small farmers implemented by the Brazilian Federal Government in 1996. Ajzen's Theory of Planned Behavior (1991) was used to evaluate the beneficiaries' intention in paying what they owned. In order to accomplish this evaluation, two studies were conducted. The first one (Preliminary Study) focused on the small farmer's beliefs about the program operation. The second (Main Study) focused on the measurement of these beliefs. Two beneficiary groups participated of the studies: Group A (agrarian reform settlers) and Group B (small farmers). According to Ajzen's model, for the participants of the Group A, the Attitude, the Normative belief (subjective norm component) and the Subjective Norm were positive significant predictors of the Intention to repay the credit. For the Group B, the Attitude, Behavioral belief (attitude component), Normative belief (subjective norm component) and Control belief (perceived behavioral control component) were positive significant predictors of the Intention to repay the credit. The Perceived behavioral control did not influence directly the behavioral Intention, but this variable indirectly predicts the target behavior.
We propose a novel detection concept for neutrinoless double-beta decay searches. This concept is... more We propose a novel detection concept for neutrinoless double-beta decay searches. This concept is based on a Time Projection Chamber (TPC) filled with high-pressure gaseous xenon, and with separated-function capabilities for calorimetry and tracking. Thanks to its excellent energy resolution, together with its powerful background rejection provided by the distinct double-beta decay topological signature, the design discussed in this Letter Of Intent promises to be competitive and possibly out-perform existing proposals for next-generation neutrinoless double-beta decay experiments. We discuss the detection principles, design specifications, physics potential and R&D plans to construct a detector with 100 kg fiducial mass in the double-beta decay emitting isotope Xe(136), to be installed in the Canfranc Underground Laboratory.
This work presents probabilistic methods for testability analysis at RTL and their use to guide D... more This work presents probabilistic methods for testability analysis at RTL and their use to guide DFT techniques like partial-scan and TPI. Controllability is analyzed using three different approaches, an exact one, an approximated one that ignores the correlation between state variables and a third that only takes into account correlations within pre-defined groups that are formed based on an originally proposed heuristic that uses RTL information. These controllability analysis methods are evaluated using simulation based controllability as a reference. Two observability metrics are originally defined: event observability and LSA observability. The proposed testability analysis methods were implemented in a tool that takes as input a Verilog RTL description, solves the Chapman-Kolmogorov equations that describe the steady-state of the circuit, and outputs the computed values for the testability. A methodology for partial-scan and TPI optimization is proposed. The methodology is based on the testability metrics and on a "DFT dictionary". The proposed heuristic and methodology are evaluated using the ITC99 benchmark circuits
High voltage (HV) level-shifters and logic gates tolerant to supply voltages higher than the proc... more High voltage (HV) level-shifters and logic gates tolerant to supply voltages higher than the process limit for individual CMOS transistors are proposed. The logic gates topology is based on the Differential Cascode Voltage Switch Logic (DCVSL). The proposed HV DCVSL level shifters are particularly useful when it is mandatory to ensure a specific behavior during out of the normal mode
This paper presents the experience gained at the Integration and Tests Laboratory—LIT, National I... more This paper presents the experience gained at the Integration and Tests Laboratory—LIT, National Institute for Space Research—INPE, in São José dos Campos, SP, from the thermal vacuum tests campaign of the SATEC protoflight spacecraft, held from February 6th to 12th, 2003. The Satélite Tecnológico (SATEC) is a micro-satellite made in Brazil, as a payload for the Brazilian launching vehicle VLS-1.3, scheduled to be launched in the year of 2003. Considering the small size, relatively small cost and limited responsibility of this particular micro-satellite, the environmental tests should be performed in a short period of time requiring as low cost as possible, albeit being reliable, comprehensive and representative. For the thermal vacuum tests basically it was used a medium-size space simulation chamber, complemented by the use of the technique of thermal radiant heat plates for simulation of the heat input from the orbital thermal conditioning. This paper details the infrared testing technique applied to the acceptance tests of the Brazilian micro-satellite, including the adopted test setup, the thermal vacuum chamber mode-of-operation and performance, the precise thermal conditioning and controlling of the radiative heat plates, and the results obtained in terms of spacecraft temperatures. SATEC was lost when the VLS-1 pre-ignited on pad during final launching procedures on 2003 August 22nd.
The paper investigates the provision of training to employees by accounting firms operating in Ri... more The paper investigates the provision of training to employees by accounting firms operating in Rio de Janeiro, Brazil. The main objectives are (a) to characterize the work environment; (b) to identify which types of training are provided, and (c) to test hypotheses about the impact of organizational characteristics on the provision of training. Data have been collected from a convenience sample of some 531 respondents to a postal survey that included about 3700 organizations registered in the regional professional council. The questionnaire comprised
Journal of Materials Science-materials in Medicine, 1996
Granules of a modified hydroxyapatite, glass-reinforced hydroxyapatite composite and commercial h... more Granules of a modified hydroxyapatite, glass-reinforced hydroxyapatite composite and commercial hydroxyapatite were implanted in rabbit tibiae. Histological studies were carried out after 1 and 2 months implantation periods using light and fluorescence microscopy. A much higher percentage of bone contact was developed for both the glass-reinforced hydroxyapatite composite and the modified hydroxyapatite when compared to commercial hydroxyapatite (89–91% versus 66%) after 2 months implantation. The mechanism of bone formation and growth around implants is discussed in terms of the influence of elements incorporated into these novel materials which are commonly found in bone tissues, such as Na, K and Mg, and the presence of a soluble β-tricalcium phosphate phase in the microstructure of the composite.
This publication is part of a major study (Thesis). In that thesis it was analyzed the intention ... more This publication is part of a major study (Thesis). In that thesis it was analyzed the intention of Pronaf's beneficiaries to repay the credit they have received. The Pronaf is a line of credit for small farmers implemented by the Brazilian Federal Government in 1996. Ajzen's Theory of Planned Behavior (1991) was used to evaluate the beneficiaries' intention in paying what they owned. In order to accomplish this evaluation, two studies were conducted. The first one (Preliminary Study) focused on the small farmer's beliefs about the program operation. The second (Main Study) focused on the measurement of these beliefs. Two beneficiary groups participated of the studies: Group A (agrarian reform settlers) and Group B (small farmers). According to Ajzen's model, for the participants of the Group A, the Attitude, the Normative belief (subjective norm component) and the Subjective Norm were positive significant predictors of the Intention to repay the credit. For the Group B, the Attitude, Behavioral belief (attitude component), Normative belief (subjective norm component) and Control belief (perceived behavioral control component) were positive significant predictors of the Intention to repay the credit. The Perceived behavioral control did not influence directly the behavioral Intention, but this variable indirectly predicts the target behavior.
We propose a novel detection concept for neutrinoless double-beta decay searches. This concept is... more We propose a novel detection concept for neutrinoless double-beta decay searches. This concept is based on a Time Projection Chamber (TPC) filled with high-pressure gaseous xenon, and with separated-function capabilities for calorimetry and tracking. Thanks to its excellent energy resolution, together with its powerful background rejection provided by the distinct double-beta decay topological signature, the design discussed in this Letter Of Intent promises to be competitive and possibly out-perform existing proposals for next-generation neutrinoless double-beta decay experiments. We discuss the detection principles, design specifications, physics potential and R&D plans to construct a detector with 100 kg fiducial mass in the double-beta decay emitting isotope Xe(136), to be installed in the Canfranc Underground Laboratory.
This work presents probabilistic methods for testability analysis at RTL and their use to guide D... more This work presents probabilistic methods for testability analysis at RTL and their use to guide DFT techniques like partial-scan and TPI. Controllability is analyzed using three different approaches, an exact one, an approximated one that ignores the correlation between state variables and a third that only takes into account correlations within pre-defined groups that are formed based on an originally proposed heuristic that uses RTL information. These controllability analysis methods are evaluated using simulation based controllability as a reference. Two observability metrics are originally defined: event observability and LSA observability. The proposed testability analysis methods were implemented in a tool that takes as input a Verilog RTL description, solves the Chapman-Kolmogorov equations that describe the steady-state of the circuit, and outputs the computed values for the testability. A methodology for partial-scan and TPI optimization is proposed. The methodology is based on the testability metrics and on a "DFT dictionary". The proposed heuristic and methodology are evaluated using the ITC99 benchmark circuits
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