scholarly journals Calculation of the effect of slit size on emittance measurements made by a two-slit scanner

2015 ◽  
Author(s):  
Richard D'Arcy ◽  
Alexander Shemyakin
Keyword(s):  
Slit Size

scholarly journals Design and Fabrication of a Novel Window-Type Convection Device

2020 ◽  
Vol 11 (1) ◽  
pp. 267
Author(s):  
Han-Tang Lin ◽  
Yunn-Horng Guu ◽  
Wei-Hsuan Hsu
Keyword(s):  
Energy Consumption ◽  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Energy Demand ◽  
Air Entrainment ◽  
Wind Speeds ◽  
Digit Series ◽  
Slit Size ◽  
Deflector Plate

Global warming, climate change, and ever-increasing energy demand are among the pressing challenges currently facing humanity. Particularly, indoor air conditioning, a major source of energy consumption, requires immediate improvement to prevent energy crises. In this study, various airfoil profiles were applied to create a window-type convection device that entrains air to improve convection between indoor and outdoor airflows and adjust the indoor temperature. How the geometric structure of the convection device affects its air entrainment performance was investigated on the basis of various airfoil profiles and outlet slit sizes of the airflow multiplier. The airfoil profiles were designed according to the 4-digit series developed by the National Advisory Committee for Aeronautics. The results revealed that airfoil thickness, airfoil camber, and air outlet slit size affected the mass flow rate of the convection device. Overall, the mass flow rate at the outlet of the convection device was more than 10 times greater than at the inlet, demonstrating the potential of the device to improve air convection. To validate these simulated results, the wind-deflector plate was processed using the NACA4424 airfoil with a 1.2 mm slit, and various operating voltages were applied to the convection device to measure the resulting wind speeds and calculate the corresponding mass flow rates. The experimental and simulated results were similar, with a mean error of <7%, indicating that the airfoil-shaped wind-deflector plate substantially improved air entrainment of the convection device to the goal of reduced energy consumption and carbon emissions.

Size-Exclusion Surface Plasmon Resonance Sensing With a Microslit Array Chip

2011 ◽  
Author(s):  
Noriko Nagase ◽  
Kazunori Shimizu ◽  
Nobumitsu Miyanishi ◽  
Seiko Shimamoto ◽  
Kyohei Terao ◽  
...  
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Size Exclusion ◽  
Nano Particle ◽  
Sugar Chain ◽  
Model Sample ◽  
Slit Size ◽  
Micrometer Size ◽  
Different Diameters

In this study, we propose a novel surface plasmon resonance (SPR) chip on which the microslit array was fabricated. The microslit excludes micrometer-size objects that are larger than its slit size from sensing field, so that it acts as a filter. In order to confirm the filtereffect, we demonstrated the sensing of microparticles of different diameters using the SPR chip. As the demonstration of the biotechnology application, we performed the discrimination of aggregation of bio-molecules using SGNP (Sugar chain imobilized Gold Nano Particle) as a model sample.

scholarly journals O++ relative abundance in IC 418 from permitted lines

1997 ◽  
Vol 180 ◽  
pp. 104-104
Author(s):  
J. Echevarría ◽  
R. Costero
Keyword(s):  
Relative Abundance ◽  
Central Star ◽  
Total Exposure ◽  
Spectral Coverage ◽  
The North ◽  
San Pedro ◽  
Ccd Detector ◽  
Slit Size

Two multisite campaigns devoted to HD 35914, the variable central star of IC 418, have been performed (Handler et al., 1996). In the second one, many spectra of the star were obtained during five nights on November 1994. The Echelle REOSC spectrograph and a 1024 × 1024 Tektronix CCD detector, attached to the 2.1m telescope at the Observatorio Astronómico Nacional in San Pedro Mártir, México, was used then. The north-south diameter of the nebula was included in the 20 spectra taken the night of November 18 (184–minute total exposure). The spectral coverage and reciprocal resolution was 4300 å to 7350 å and about 0.16å/pix, respectively. The projected slit size was 1″ × 26″, approximately.

Research on the physical model of features of the behavior of a two-phase bath at top blowing through a tip with folded nozzles

2020 ◽  
pp. 129-138
Author(s):  
S.І. Semykin ◽  
Т.S. Golub ◽  
V.V. Vakulchuk
Keyword(s):  
Physical Model ◽  
Silicone Oil ◽  
Mixing Processes ◽  
Two Phase ◽  
Converter Bath ◽  
Slit Size ◽  
Phase Liquid ◽  
Two Phases ◽  
Active Mixing ◽  
Favorable Conditions

At the previous stage of research using a physical model of an oxygen converter, the results of studying the features of purging a single-phase liquid through a single composite nozzle were obtained. The aim of this work was to study the behavior of a two-phase bath using a multi-nozzle lance with folded nozzles. At this stage of the study, silicone oil was used to simulate the slag phase of a two-phase bath. The peculiarities of the influence of experimental nozzles on the processes of mixing and foaming of two phases were studied. Three variants of the experimental nozzle design were investigated: a combination of a conventional and a slit nozzle with a ratio of their areas of 1: 1, 1: 2 and 2: 1. It is established that the use of a tip with four nozzles during purging from above promotes the active formation of a two-layer foamed emulsion on the surface of the bath. Comparison of the operation of the tip with folded nozzles with a tip with a cylindrical indicates more active mixing of the two liquids and the formation of a more stable and much higher layer of foamed emulsion. The most favorable conditions for the organization of full mixing of the two phases in the converter bath are formed when using folded nozzles with a slit size of about 35% and a ratio of slot and nozzle area of 1: 2. To intensify the mixing processes in the upper zone of the unit, it is most expedient to use folded nozzles with a larger fraction of the slit (up to 65%) and the ratio of the areas of the components of the nozzle 2: 1. The use of nozzles with equal areas of components in the studied conditions does not have a positive effect on metabolic processes in the converter bath.

Effects of Slitting Size and Inlet Operating Conditions on Hydrogen Combustion Characteristics in a Micro-Combustor With a Controllable Vortex Slotted Bluff Body

2019 ◽  
Vol 142 (4) ◽  
Author(s):  
Yunfei Yan ◽  
Kaiming Shen ◽  
Yu Cui ◽  
Ziqiang He ◽  
Li Zhang ◽  
...  
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Bluff Body ◽  
Combustion Efficiency ◽  
Combustion Characteristics ◽  
Operating Conditions ◽  
Flow Ratio ◽  
Gas Flow Rate ◽  
Slit Size ◽  
Micro Combustor

Abstract Effects of controllable vortex slotted bluff body parameters (position of a bluff body, slit size, and controllable flow ratio) on the combustion characteristics of hydrogen/air in a micro-combustor with a bluff body were investigated numerically. The results illustrated that the combustion efficiency of hydrogen decreases with increasing distance (L1) between the front edge of the bluff body and the combustor inlet. The combustion characteristics of the micro-combustor are optimum when L1 is 0 mm. The blow-off limit of the combustor reaches a maximum (564 cm3/s) when the slit width (d) is 20% of the bluff body width. The blow-off limit first increases and then decreases when the equivalence ratio (φ) increases and reaches a maximum (732 cm3/s) when φ is 1.0, and the controllable flow ratio is 0.2. The combustion efficiency of hydrogen is gradually increased with the increase in the controllable flow ratio. When φ is less than 1.0, the optimal controllable flow ratio gradually decreases with the increase in the premixed gas flow rate, and the optimal controllable flow ratio basically remains at 0.6 when the premixed gas flow rate is less than 360 cm3/s.

OS0705 Effect of specimen size and slit size on dynamic response in the case of two-dimensional impact testing model

2012 ◽  
Vol 2012 (0) ◽  
pp. _OS0705-1_-_OS0705-2_
Author(s):  
Ryoya IWATSU ◽  
Shin ITO ◽  
Kazuo HAYASHI
Keyword(s):  
Dynamic Response ◽  
Specimen Size ◽  
Impact Testing ◽  
Two Dimensional ◽  
Testing Model ◽  
Slit Size

Design and Shielding Effectiveness of Electromagnetic Shielding Textiles

2013 ◽  
Vol 796 ◽  
pp. 653-656
Author(s):  
Yan Su Liu ◽  
Guo Hua Chen
Keyword(s):  
Influence Factor ◽  
Electromagnetic Shielding ◽  
Shielding Effect ◽  
Tunnel Effect ◽  
Shield Effectiveness ◽  
Shielding Effectiveness ◽  
Exposed Area ◽  
Slit Size ◽  
Radiation Material ◽  
Garment Design

.In order to design better anti-radiation and electromagnetic shielding fabric and the clothing and makes it maintained better of electromagnetic shield effectiveness, the influence of radiation source, radiation distance, anti-electromagnetic radiation material, fabric structure, gap size, holes area, clothing exposed area as well as the tunnel effect and so on the fabric radiation protection performance were comprehensively discussed in this article. As well, according to these influence factor analysis the regular conditions that the electromagnetic shielding fabric and garment design should be meet. The analysis result indicated that the shielding effectiveness of the fabric was decreased with the increase of the radiant frequency, the fabric slit size, the hole area and enhanced with the growing of the metal content, the organizational structure close degree as well as the radiation distance.In the case of the equal shielding effect, the bigger exposed area leads weaker electromagnetic shielding effectiveness and if the exposed area oversize can cause the shield effect vanished. Also the clothing shield potency was related to the opening radius, the length, the inside and outside dielectric constant, the permeability of the shirt or cuff. The comprehensive effectiveness of electromagnetic shielding fabrics will be gradually improved if they can meet these regular conditions continually.

scholarly journals Improved Accuracy of a Single-Slit Digital Sun Sensor Design for CubeSat Application Using Sub-Pixel Interpolation

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1472
Author(s):  
Fuat Kaan Diriker ◽  
Alexander Frias ◽  
Ki Hwan Keum ◽  
Regina S. K. Lee
Keyword(s):  
Sun Sensor ◽  
Simple Geometry ◽  
Lower Accuracy ◽  
Mask Design ◽  
Slit Size ◽  
Micro Systems ◽  
And Control ◽  
Improved Accuracy ◽  
Pixel Interpolation ◽  
Better Than

In recent years, we have seen significant improvements in the digital sun sensor (DSS) design enabled by advanced micro-systems fabrication and optical sensing technologies. In this paper, we propose a simple single-slit DSS concept with improved accuracy using sub-pixel interpolation. In considering the DSS design, we focused on several characteristics of the sun sensor, including field-of-view, sensor accuracy, complexity, and computational requirements. First, the optimal mask design was determined based on the simple geometry of the slit size, mask height and pixel width. Then, a two-step pixel read-out algorithm was implemented for sub-pixel level interpolation to determine the illumination ratio using 1-, 2-, 4- and 8-bit readouts. Lastly, the improved DSS was integrated with typical CubeSat, commercial-grade attitude sensors suite and a simple TRIAD method to determine the attitude of a CubeSat in LEO. Compared to standard 1-bit read-out mode (0.32 deg RMSE), 8-bit DSS achieves better than 0.01 deg RMSE. In a CubeSat scenario, improvements in attitude knowledge and control accuracy are marginal when using TRIAD, due to the significantly lower accuracy in other CubeSat-scale sensors (magnetometer, for example).

A densitometer based on a microcomputer and TV camera, for use in the clinical laboratory.

1984 ◽  
Vol 30 (3) ◽  
pp. 462-465 ◽  
Author(s):  
R P Tracy ◽  
D S Young
Keyword(s):  
Clinical Laboratory ◽  
Control Program ◽  
Digital Information ◽  
Two Dimensional ◽  
Video Monitor ◽  
Television Camera ◽  
Response Range ◽  
Hardware Configuration ◽  
Slit Size ◽  
Dimensional Electrophoresis

Abstract We describe a microcomputer-based densitometer that includes a television camera for the analysis of one- and two-dimensional electrophoresis gels. The hardware configuration is a modification of that described by Mariash et al. (Anal Biochem 212: 388-394, 1982). The video signal is digitized by a commercially available interface, yielding 1 of 64 greyscale values for each pixel examined. The operator controls the region being analyzed through the use of a joystick and video monitor. We have optimized the linear response range (0-1.5 A) and have written a relatively simple control program ("GELSCAN 5.0"). For analyses of one-dimensional gels, the required operator decisions include the start and finish points of the gel, the width of the scan (analogous to slit size), and the level of background correction. The digital information may be stored on disk, displayed by one of several graphic routines, and analyzed for total scan and individual peak absorbance values. Similar analyses may be done with two-dimensional gel spots.

Discrete-element investigation of influence of granular debris flow baffles on rigid barrier impact

2016 ◽  
Vol 53 (1) ◽  
pp. 179-185 ◽  
Author(s):  
Raymond Pak Hei Law ◽  
Clarence Edward Choi ◽  
Charles Wang Wai Ng
Keyword(s):  
Debris Flow ◽  
Discrete Element ◽  
Row Spacing ◽  
Dynamic Force ◽  
Flow Front ◽  
Flume Experiments ◽  
Rigid Barrier ◽  
Flow Energy ◽  
Slit Size ◽  
Peak Impact Force

Granular debris flow baffles are commonly installed in front of rigid barriers to dissipate flow energy and reduce the required barrier impact capacity. Despite the engineering value of baffles, their influence on rigid barrier impact is still not well understood. A previously calibrated discrete element method (DEM) model using a series of flume experiments was adopted to study the effectiveness of installing baffles in front of a rigid barrier. Froude scaling was used to characterize the flow front. Different baffle configurations were examined, namely number of rows, spacing between successive rows (L), and baffle height. Results reveal an optimum row spacing of L/D = 3 (D is the slit size). Row spacing less than L/D = 3 leads to increased peak dynamic force from overflow impacting the barrier, whereas row spacing greater than L/D = 3 results in increased peak dynamic force from the granular debris flow front. Increasing spacing greater than L/D = 3 allows the dispersion of debris between rows and decreases the effectiveness of the second row. Adopting baffle heights greater than 1.5 times the approach flow depth (h) reveals little influence on the peak impact force induced on the barrier.

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