scholarly journals Development of a 7000 × 4000 Pixel Mosaic CCD Camera

1995 ◽  
Vol 167 ◽  
pp. 345-346 ◽  
Author(s):  
Nobunari Kashikawa ◽  
Masafumi Yagi ◽  
Naoki Yasuda ◽  
Sadanori Okamura ◽  
Kazuhiro Shimasaku ◽  
...  
Keyword(s):  
Good Accuracy ◽  
Vertical Direction ◽  
Ccd Camera ◽  
Horizontal Direction ◽  
Alignment Accuracy ◽  
Thermal Coefficient ◽  
Pixel Size ◽  
Set Up

The CCD we use is TC215 manufactured by TI, Japan. The pixel size is 12 microns square. It is a virtual phase CCD which has a peak QE of 60% at 700 nm and 15% QE at 350 nm. It is commercially available in a package, which is too big to meet our requirement for CCD spacing. We therefore put the CCD in a specially made compact package. Each chip is mounted on a machined ceramic spacer whose thermal coefficient is matched with that of the CCD package. We glue each CCD chip on the spacer under a microscope to measure YHE x − y position and height. Then we screw the CCD chip + spacer on a copper motherboard with the help of the gauge which has a planned grid with a good accuracy. The alignment accuracy we can get with such set-up procedures is an order of 5 microns (< 0.5 pixel) in the horizontal direction and 10 microns in the vertical direction.

scholarly journals Numerical Analysis of the Hydrogen Dispersion Behavior in Different Directions in a Naturally Ventilated Space

2021 ◽  
Vol 11 (2) ◽  
pp. 615
Author(s):  
Xiaolu Zhang ◽  
Qiubo Wang ◽  
Xulei Hou ◽  
Yuejuan Li ◽  
Yang Miao ◽  
...  
Keyword(s):  
Mole Fraction ◽  
Vertical Direction ◽  
Side Wall ◽  
Horizontal Direction ◽  
Simplified Model ◽  
Geometrical Configuration ◽  
Horizontal Diffusion ◽  
Diffusion Speed ◽  
Set Up ◽  
Diffusion Of Hydrogen

Studies on hydrogen leakage have mainly focused on the influences of location and geometrical configuration on the distribution of the hydrogen in various spaces. The present study developed a simplified model for the leakage diffusion of hydrogen in an enclosed cuboid space with two vents, at the top and at the bottom, respectively. The effect of different leakage positions on the diffusion of the hydrogen was analyzed. The results showed that when hydrogen diffused vertically from the bottom to the top of the space, the farther the leakage position was from the vent on the side wall, the more hydrogen accumulated. When the hydrogen leaked in the vertical direction from the floor, the distance between the leakage position and the bottom vent had little effect on the horizontal diffusion speed of the hydrogen at the top of the space. The diffusion speed for the leakage in the horizontal direction was faster than that in the vertical direction. When the hydrogen leaked in the horizontal direction from the side wall, the height of the leakage had little effect on the horizontal diffusion speed of the hydrogen at the top of the space. Stratification occurred for models set up in the present study whenever the envelope of 1% mole fraction, or 4% mole fraction, of hydrogen extended to the whole ceiling.

Numerical Simulation of a Jumper Conveying Slurry for Deep-Sea Mining

2021 ◽  
Author(s):  
Marcio Yamamoto ◽  
Tomo Fujiwara ◽  
Joji Yamamoto ◽  
Sotaro Masanobu
Keyword(s):  
Experimental Data ◽  
Pressure Drop ◽  
Dynamic Analysis ◽  
Internal Pressure ◽  
Deep Sea ◽  
Petroleum Industry ◽  
Vertical Direction ◽  
Internal Flow ◽  
Horizontal Direction ◽  
Viscous Pressure

Abstract One key technology for Deep-Sea Mining is the riser system. The riser is already a field-proven technology in the Petroleum Industry. However, several differences exist between a petroleum production riser and a riser for Deep-Sea Mining, mainly related to the internal flow. The ore-slurry has a larger density than the hydrocarbons and shall be pumped with a much higher flowrate. The current software tools for riser’s dynamic analysis may include the internal fluid hydrostatic pressure and the centrifugal and Coriolis forces imposed by the bent pipe’s internal flow. However, the internal pressure drop is not calculated. The internal pressure alters the pipe’s effective tension and can alter the pipe’s bending moment changing its mechanical behavior. This article describes a computational script’s development to run embedded in a commercial software for riser’s dynamic analysis. Our script calculates the internal viscous pressure drop along with the jumper. This pressure is then converted into wall axial tension (buckling) and imposed on each node of the jumper’s numerical model. Each simulation case was calculated twice with and without the internal flow viscous pressure drop. The comparison with experimental data revealed that the jumper’s average position has a good agreement among all cases. However, the amplitude caused by the top oscillation showed some discrepancies. Experimental data has the highest amplitude in the horizontal direction, while the simulation without viscous pressure calculation had the smallest. The simulation with our embedded script had intermediary amplitude in the horizontal direction. The vertical direction amplitudes have the same behavior for all cases, but the experimental data showed the highest amplitude.

scholarly journals T A U M O K—Multi-Object Spectroscopy with the Tautenburg Schmidt Telescope

1995 ◽  
Vol 148 ◽  
pp. 52-52
Author(s):  
S. Marx ◽  
H. Lehmann ◽  
M. Pluto ◽  
R. Ziener
Keyword(s):  
Focal Plane ◽  
Ccd Camera ◽  
Entrance Slit ◽  
Pixel Size ◽  
Schmidt Telescope ◽  
Max Planck ◽  
Background Light ◽  
Convex Lens ◽  
Chip Size ◽  
Calar Alto

A multi-object camera for the Tautenburg Schmidt Telescope (134/200/400) was developed and constructed in cooperation with the Max-Planck-Institut für Astronomie in Heidelberg and the Thüringer Landesstemwarte Tautenburg. The experience with the “Spaltspinne” for the 3.5 m Telescope of the Calar Alto Observatory (Pitz 1993) was the foundation of TAUMOK. The technical concept was given by Pitz et al. (1993).Thirty six rods controlled by a processor can be moved in an area with a diameter of 16 cm. This area covers a field of 2.3° in the focal plane which is flattened by a plano-convex lens. Each of 34 rods carry two fibres with diameters of 100/µm with one fibre for the object and another for the background light. The fibres have a length of 7 m and their opposite faces form the entrance slit of a spectrograph. At present, reciprocal dispersions of 3.4, 10, 20 and 40 nm/mm can be realized. A CCD camera with a chip-size of 1152 × 770 pixels (pixel size 22.5/µm) is used as detector. Two of the 36 rods are equipped with image bundles for telescope guiding.

Grief and the Imminent Threat of Non-Being

1971 ◽  
Vol 118 (545) ◽  
pp. 467-468 ◽  
Author(s):  
S. Sunder Das
Keyword(s):  
Vertical Direction ◽  
Horizontal Direction ◽  
Self Awareness ◽  
Differentiated Integration ◽  
Existential Grief ◽  
The Subject ◽  
Cultural Dominance ◽  
Imminent Threat

The experience and meaning of grief differs with the progression of self-awareness of the experiencer in his ontogenetic evolution from utter dependence to differentiated integration. Autonomy, achieved by very few adults, carries with it the connotation of transcendence over mere obedience and conformity to the canons of society. This is different from deviance in two important respects. Deviance is a movement in a horizontal direction away from cultural dominance, and therefore could manifest itself in antisocial activities. Autonomy, being a movement in a vertical direction, is supra-cultural and non-conformist rather than antisocial. All this has a great deal to do with existential grief, the experience of which can change according to the level of ontology of the experiencer. The following operational definitions are needed to treat the subject of ontological grief in a meaningful manner.

Flow Deflection by Gauze Screens

1969 ◽  
Vol 11 (3) ◽  
pp. 290-294 ◽  
Author(s):  
A. J. Reynolds
Keyword(s):  
Mathematical Model ◽  
Good Accuracy ◽  
Velocity Variations ◽  
Set Up ◽  
Flow Deflection

A mathematical model is set up to predict the deflection of a flow passing obliquely through a plane gauze. It differs from existing descriptions in accounting consistently for velocity variations in the deflecting flow, and in relating the deflection at the gauze to the total deflection in a more realistic way. The deflection at the gauze is specified in two ways, as being half the total, and as equalling the total. These two relations are found to represent the performance of gauzes whose solidities are, respectively, less than and greater than one-half. Formulae are developed which predict the flow deflection with good accuracy for these two régimes.

White-beam X-ray radioscopy and tomography with simultaneous diffraction at the EDDI beamline

2013 ◽  
Vol 20 (5) ◽  
pp. 809-810 ◽  
Author(s):  
F. García-Moreno ◽  
C. Jiménez ◽  
P. H. Kamm ◽  
M. Klaus ◽  
G. Wagener ◽  
...  
Keyword(s):  
Pixel Size ◽  
X Ray ◽  
Simultaneous Imaging ◽  
White Beam ◽  
Set Up

A set-up for simultaneous imaging and diffraction that yields radiograms with up to 200 frames per second and 5.6 µm effective pixel size is presented. Tomograms and diffractograms are acquired together in 10 s. Two examples illustrate the attractiveness of combining these methods at the EDDI beamline forin situstudies.

scholarly journals Inter- and Intragranular Stress Determination with Kossel Microdiffraction in a Scanning Electron Microscope

2006 ◽  
Vol 524-525 ◽  
pp. 109-114 ◽  
Author(s):  
Raphaël Pesci ◽  
Karim Inal ◽  
Sophie Berveiller ◽  
Etienne Patoor ◽  
Jean Sébastien Lecomte ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Ccd Camera ◽  
Stress Sensitivity ◽  
In Situ Tests ◽  
Set Up ◽  
Line Patterns ◽  
Electron Back Scattered Diffraction ◽  
Scanning Electron

A Kossel microdiffraction experimental set up is under development inside a Scanning Electron Microscope (SEM) in order to determine the crystallographic orientation as well as the inter- and intragranular strains and stresses on the micron scale, using a one cubic micrometer spot. The experimental Kossel line patterns are obtained by way of a CCD camera and are then fully indexed using a home-made simulation program. The so-determined orientation is compared with Electron Back-Scattered Diffraction (EBSD) results, and in-situ tests are performed inside the SEM using a tensile/compressive machine. The aim is to verify a 50MPa stress sensitivity for this technique and to take advantage from this microscope environment to associate microstructure observations (slip lines, particle decohesion, crack initiation) with determined stress analyses.

Design and Application of the Butt Auxiliary Device for the Erection of Steel Tower Using Helicopter

2013 ◽  
Vol 387 ◽  
pp. 319-322
Author(s):  
Yong Jun Xia ◽  
Qian Miao ◽  
Ke Xin Huang
Keyword(s):  
Transmission Line ◽  
Simple Structure ◽  
Engineering Application ◽  
Vertical Direction ◽  
Horizontal Direction ◽  
Construction Technology ◽  
Overhead Transmission Line ◽  
Auxiliary Device ◽  
Design And Application

The erection construction technology of steel tower of overhead transmission line using helicopter has higher requirements to the butt auxiliary device. According to the GE1 steel tower of the QingZang AC/DC interconnection project Geermu converter station earthling line, the butt auxiliary device is developed. The butt auxiliary device includes a guiding device, horizontal-direction caging device and vertical-direction caging device and solve the problems as follows limiting in air, docking, perching and temporary supporting. The successful engineering application show that the butt auxiliary device is safety and reliable and has perfect function, simple structure and convenient installing and removing. This provides reference for the design of the butt auxiliary device to other types steel tower of transmission line.

Numerical Analysis of a Shallow-Buried Portal in Expressway Tunnel with Weak Rockmass

2012 ◽  
Vol 256-259 ◽  
pp. 1369-1372
Author(s):  
Pan Ke Gao ◽  
Yong Li Xie ◽  
Heng Bin Wu
Keyword(s):  
Finite Element ◽  
Numerical Analysis ◽  
Finite Element Simulation ◽  
Vertical Direction ◽  
Surrounding Rock ◽  
Horizontal Direction ◽  
Element Simulation ◽  
Key Factor ◽  
Mountain Tunnels ◽  
Unsymmetrical Loading

Aiming at the problems in construction for a shallow-buried and unsymmetrical loading portal in Banzhulin Tunnel in Yu-Xiang expressway, the finite element simulation were carried on to study the behavior for bench excavation method. Main results of numerical analysis as follows:the displacement of surrounding rock of right tunnel(as AR)at the horizontal direction is large and may larger than that of the left tunnel(as AL) at the vertical direction,and the largest deformation is 22.63mm,occuring at the key point DL. Compared with the data of monitoring measurement, the correctness of this simulation was proved.The behavior for deformation and stress of mountain tunnels as Banzhulin is basically mastered,and the displacement of rockmass is the key factor in tunnelling.

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