17 research outputs found
Recent Development of SANS BATAN Spectrometer (SMARTer) in Serpong for Simultaneous and Automatic Measurements
No full textThe 36 meter SANS BATAN spectrometer (SMARTer) in Serpong Indonesia has
been developed for simultaneous and automatic measurements. The existing motor
controller of ISA (Industry Standard Architecture) interface was replaced by the
programmable motor controller of PCI (Peripheral Component Interconnect)
interface, since it has speed and interrupt-sharing advantages, to drive all stepper
motors for collimator, pinhole, and detector movements of the spectrometer. The
recent development makes all motors moved and controlled simultaneously in
setting up the instrument configuration before performing the experiment. Along
with that improvement, the data acquisition software has been also developed to
drive the beam stopper movement in two directions as well as to read the absolute
collimator and detector positions, to acquire neutron counts on the monitor and the
main detector, and also to control automatically up to 12 sample positions of the
sample changer. The collected neutron counts is displayed in real time on the main
monitor window, and the counts is saved in a special format for further data
reduction and analysis. The developed data acquisition software has been
implemented and performed for experiment that use preset time or preset count
mode, and the automatic sample change
Design and Construction of the Control System for Batan Small Angle Neutron Scattering Spectrometer (SMARter)
No full textA 36 m Small Angle Neutron Scattering (SANS) Spectrometer (SMARTer) has been installed in Serpong, Indonesia in 1992. As time goes by, the original main computer was out of order and the instrument had not been operated since 2003. In order to activate the SMARTer, in the year 2005, a work on designing and constructing a new control system for SMARTer was carried out. The main component of this control system is a programmable peripheral I/O (IC PPI 8255) and was assembled as a plug-in board at an ISA slot of a personal computer. An IC PPI 8255 was programmed to control the mechanical movements of the instrument’s components: four neutron guide tubes, six pinholes collimator, a detector and a beam stopper. The test either with or without neutron beam has shown that this control system can be implemented for the mechanical movements of SMARTer. Error of moving the detector in the distance range of 1.5 m – 18 m is only 1 mm and the other movements have no error at all (precise)
Design and Construction of the Control System for Batan Small Angle Neutron Scattering Spectrometer (SMARter)
No full textA 36 m Small Angle Neutron Scattering (SANS) Spectrometer (SMARTer) has been installed in Serpong, Indonesia in 1992. As time goes by, the original main computer was out of order and the instrument had not been operated since 2003. In order to activate the SMARTer, in the year 2005, a work on designing and constructing a new control system for SMARTer was carried out. The main component of this control system is a programmable peripheral I/O (IC PPI 8255) and was assembled as a plug-in board at an ISA slot of a personal computer. An IC PPI 8255 was programmed to control the mechanical movements of the instrument’s components: four neutron guide tubes, six pinholes collimator, a detector and a beam stopper. The test either with or without neutron beam has shown that this control system can be implemented for the mechanical movements of SMARTer. Error of moving the detector in the distance range of 1.5 m – 18 m is only 1 mm and the other movements have no error at all (precise)
Structural Organization of Poly(vinyl alcohol) Hydrogels Obtained by Freezing/Thawing and γ-Irradiation Processes: A Small-Angle Neutron Scattering (SANS) Study
No full textAbstractThe structural organization of poly(vinil alcohol) (PVA) hydrogels obtained by repeatedly freeze/thaw and γ-irradiation processes of 15% w/w PVA solution in D2O has been revealed by small-angle neutron scattering (SANS) technique. The opaque sample is due two separated phases which composed by polymer-rich and polymerpoor regions occurred from freezing/thawing samples, while transparent sample formed from irradiated PVA hydrogels sample. It has been pointed out from SANS experimental data that the cross-linking in the gels formed by freezing/thawing process are crystallites as the scattering intensity I(Q) decreases with the momentum transfer Q according to the -4th power law (Porod's law) in the high Q-range region. From SANS data analysis, the radius of the crystallite size is about 28 - 33Å and its distributed inhomogeneously with the average distance of 150 - 175Å in the polymer-rich phase that consisted by crystalline PVA aggregates and swollen amorphous PVA. In opposite, the irradiated PVA hydrogels with the irradiation dose of 40 kGy did not show a -4th power law scattering due to in absence of crystalline and amorphous PVA phases in the polymer-rich region
Recent Development of SANS BATAN Spectrometer (SMARTer) in Serpong for Simultaneous and Automatic Measurements
No full textThe 36 meter SANS BATAN spectrometer (SMARTer) in Serpong Indonesia has been developed for simultaneous and automatic measurements. The existing motor controller of ISA (Industry Standard Architecture) interface was replaced by the programmable motor controller of PCI (Peripheral Component Interconnect) interface, since it has speed and interrupt-sharing advantages, to drive all stepper motors for collimator, pinhole, and detector movements of the spectrometer. The recent development makes all motors moved and controlled simultaneously in setting up the instrument configuration before performing the experiment. Along with that improvement, the data acquisition software has been also developed to drive the beam stopper movement in two directions as well as to read the absolute collimator and detector positions, to acquire neutron counts on the monitor and the main detector, and also to control automatically up to 12 sample positions of the sample changer. The collected neutron counts is displayed in real time on the main monitor window, and the counts is saved in a special format for further data reduction and analysis. The developed data acquisition software has been implemented and performed for experiment that use preset time or preset count mode, and the automatic sample change
Recent Development of SANS BATAN Spectrometer (SMARTer) in Serpong for Simultaneous and Automatic Measurements
No full textThe 36 meter SANS BATAN spectrometer (SMARTer) in Serpong Indonesia has been developed for simultaneous and automatic measurements. The existing motor controller of ISA (Industry Standard Architecture) interface was replaced by the programmable motor controller of PCI (Peripheral Component Interconnect) interface, since it has speed and interrupt-sharing advantages, to drive all stepper motors for collimator, pinhole, and detector movements of the spectrometer. The recent development makes all motors moved and controlled simultaneously in setting up the instrument configuration before performing the experiment. Along with that improvement, the data acquisition software has been also developed to drive the beam stopper movement in two directions as well as to read the absolute collimator and detector positions, to acquire neutron counts on the monitor and the main detector, and also to control automatically up to 12 sample positions of the sample changer. The collected neutron counts is displayed in real time on the main monitor window, and the counts is saved in a special format for further data reduction and analysis. The developed data acquisition software has been implemented and performed for experiment that use preset time or preset count mode, and the automatic sample changer.Received: 08 November 2013; Revised: 23 December 2013; Accepted: 27 December 201
Spectral and scattering microstructural investigation in cationic gemini surfactants (12-s-12) induced by p-toluidine
No full textTechnologies of Pow(d)er: Military mathematical practitioners’ strategies and self-presentation
No full textThe category of “military mathematical practitioners” consists of those active soldiers and engineers who consciously broadcast their use of mathematical methods to achieve their goals in warfare. These are but a subset of mathematical practitioners more broadly, and they existed on a continuum from the practical to the theoretical, with each demonstrating a mix of the two. In this military case, I investigate the concerns in gunnery and fortification of Thomas Harriot, William Bourne, Thomas Digges, and Edmund Parker—an early-modern scientist, noted author on the mathematical arts, military administrator and author, and a polymath soldier and gunner, respectively—each of whom adopted a certain “mathematical posture” to distinguish themselves in these pursuits. Framed by the work of E.G.R. Taylor, Edgar Zilsel, and Erving Goffman, the examination of how mathematics were actually used by these military mathematical practitioners (which should not be conflated with their actual utility, which is shown here to be often quite lacking) demonstrates the relationship, often a gulf, between theory and practice in one area of the mathematics in later sixteenth-century England. The context, audience, method of development, instruments, and mode of presentation (print vs. manuscript vs. rhetoric) of the mathematical methods applied to warfare also provide evidence of how mathematics was both used and understood as useful in this period to build a self-image of competence and professionalism
The relation between wealth and labour market transitions: An empirical study for the Netherlands
No full textLabour Market;Wealth;Life Cycles
The Analysis of Hierarchical Structure of Mesoporous Silica in Nanometer Scale by Small Angle Scattering Method
No full textThe analysis of hierarchical structure of mesoporous silica material with template of cetyltrimethylammoniumbromide (CTAB) with co-surfactants of tetra-methylammonium hydroxide (TMAOH) and Triton X-100 was conducted by using the technique of small angle scattering (SAS) using neutron (SANS) and X-ray (SAXS). The analysis was supported by the data of nitrogen absorption and electron microscopy. The analysis showed that the concentration of CTAB affected the characteristics and pore structures of particles. The increase of co-surfactant concentrations tended to form particles that were more uniform in size and more regular in the shape of the sphere. The results of SAS analysis showed that the morphology, shape, and size of the large particles were arranged by smaller (primary or secondary) particles that had pores. The variation of surfactant templates had influenced the formation of pore structure. For CTAB-TMAOH, it would had resembled MCM-41 type which has a hexagonal structure, whereasfor CTAB-Triton X-100, it would have resembled MCM-48 type which has a cubic structure. The particles that have a high surface area which resembled pore structure MCM-41 has been able to set up by using 0.25 M of CTAB with 0.040 M of TMAOH. Moreover, the particles which resembled pore structure MCM-48 were able to set up by using 0.03 M of Triton X-100 with 0.4 M of CTAB. The analysis of SANS data that was supported by electron microscopy results is entirely showing a complete information of the particles formed by each template. Whereas SAXS analysis that supported by nitrogen adsorption method is fully confirming the information of pore characteristics
