Drift Time Corrections Based on a Practical Measurement of the Depletion Zone to Allow Accurate and Reproducible Determination of the Reduced Mobility of Ions in DT-IMS

2021 ◽  
Author(s):  
Malcolm Cämmerer ◽  
Thomas Mayer ◽  
Helko Borsdorf
Keyword(s):  
Drift Time ◽  
Depletion Zone ◽  
Mobility Of Ions ◽  
Reduced Mobility ◽  
Practical Measurement

Electrical microcharacterization of Si-TaSi2 eutectic composites

1992 ◽  
Vol 50 (2) ◽  
pp. 1700-1701
Author(s):  
J. Hefter ◽  
P. G. Rossoni
Keyword(s):  
Field Effect Transistors ◽  
Active Regions ◽  
Induced Current ◽  
Eutectic Composite ◽  
Depletion Zone ◽  
Semiconductor Matrix ◽  
Electron Beam Induced Current ◽  
Eutectic Material ◽  
Metallic Fibers

Semiconductor-metal eutectic composites, formed by directional solidification from the melt, are composed of arrays of continuous metallic fibers contained within a single-crystal semiconductor matrix. Such composites contain rods having diameters of ≈1 μm with inter-rod spacings on the order of 10 μm. These rods form cylindrical Schottky junctions with the Si and can be used as the basis for a variety of electronic and optoelectronic devices, including photodetectors and bulk field effect transistors. Electron beam induced current (EBIC) measurements permit the determination of the depletion zone surrounding the active regions of a semiconductor material. This method has been used to examine the carrier concentration in a Si-TaSi2 eutectic composite.A portion of an oval transistor mounted on a semiconducting wafer consisting of Si-TaSi2 eutectic material with contacted rod elements was studied. The rods were selectively contacted by a deposited CoSi2 film which provided an ohmic contact to the TaSi2 rods yet formed a rectifying Schottky barrier with the Si matrix.

Determination of Temperature in a Toroidal Theta Pinch Discharge with an Image Converter Camera

1965 ◽  
Vol 20 (2) ◽  
pp. 193-196 ◽  
Author(s):  
P. C. T. Van Der Laan ◽  
R. Mewe
Keyword(s):  
Plasma Column ◽  
Capacitor Bank ◽  
Drift Time ◽  
Plasma Temperature ◽  
Image Converter ◽  
Instituut Voor ◽  
Theta Pinch ◽  
Complete Ionization ◽  
The Mean

With an image converter camera, developed at the Instituut voor Plasma-Fysica, streak pictures have been made of toroidal θ-pinch discharges in helium at pressures ranging from 0.01 to 0.06 torr. The discharges are produced by a capacitor bank of 2.5 kJ. From the pictures the acceleration of the outward drifting plasma column and the drift time (1 to 2 μs) have been measured. From these quantities the mean plasma temperature after the compression has been determined. The temperature depends on the pressure and varies from about 5 x 105°K at 0.01 torr to 105°K at 0.06 torr. These results are compared with temperatures calculated from the irreversible heating during the compression. From spectroscopical measurements of the intensities of He II λ = 4686 Å and He I λ = 5015 Å the electron temperature is estimated and the assumption of complete ionization is checked.

scholarly journals A comparative geological, tectonic and geomorphological assessment of the Charlotte, Regent and Madina landslides, Western area, Sierra Leone

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Yusuf Alhaji Lahai ◽  
Kelvin F. E. Anderson ◽  
Yaguba Jalloh ◽  
Ibrahim Rogers ◽  
Mohamed Kamara
Keyword(s):  
Sierra Leone ◽  
Susceptibility Map ◽  
Landslide Area ◽  
Depletion Zone ◽  
Rock Composition ◽  
Field Surveys ◽  
X Ray ◽  
Western Area ◽  
Rock And Soil

AbstractThis work focused on three landslide events that have attracted significant public concern due to the associated calamities they recorded in 1945, 2017 and 2019, i.e. the Charlotte, Regent and Madina landslides, respectively. Their geology, tectonics (structural discontinuities) and geomorphology, i.e. their GTG characteristics were studied to establish links between them and the landslide events.Field surveys were conducted, particularly on the Charlotte landslide, where the identification of geological structures was impeded to an extent by its obliteration by vegetation and sediment accumulations on relatively planar sections of the landslide area. Remote sensing and GIS techniques (earth imagery and drone images) enhanced the mapping and determination of landslides’ geometric and geomorphic parameters. Laboratory analyses of rock and soil samples provided the landslides’ petrological characterisation and were used to determine the particle-size distribution in the slide-prone soil.The study indicated a change in the gabbroic rock composition, variable geomorphological characteristics, and nature/pattern and density of the discontinuities. These factors, to a large extent, determined the nature and magnitude of the rainfall-triggered landslides. Charlotte lithology slightly differed from the other two landslides and recorded higher Silica (Si) and Aluminum (Al) and lower iron (Fe) from X-Ray Fluorescence (XRF) than rocks of Regent and Madina landslides. The study also revealed only a tenuous correlation between rock composition and weathering depth. The slope angles at the landslides’ prominent scarps (depletion zone) are steep (> 45 degrees) with altitudes of approximately 270 m, 200 m and 470 m above sea level for Charlotte, Regent and Madina, respectively. Unlike the Charlotte landslide, both Regent and Madina landslides are active, but geometrically, their area, length and run-out distances have relatively high variance with a coefficient of variance equals to 1. Information derived from this work can help understand the spatial variation in landslide characteristics and develop a susceptibility map.

scholarly journals Applications of Ion Mobility-Mass Spectrometry in Carbohydrate Chemistry and Glycobiology

Molecules ◽  
2018 ◽  
Vol 23 (10) ◽  
pp. 2557 ◽  
Author(s):  
Yuqing Mu ◽  
Benjamin Schulz ◽  
Vito Ferro
Keyword(s):  
Mass Spectrometry ◽  
Ion Mobility ◽  
Drift Time ◽  
Structural Complexity ◽  
Ion Mobility Mass Spectrometry ◽  
Vast Number ◽  
Disease States ◽  
Coupled Technique ◽  
Analytical Tools

Carbohydrate analyses are often challenging due to the structural complexity of these molecules, as well as the lack of suitable analytical tools for distinguishing the vast number of possible isomers. The coupled technique, ion mobility-mass spectrometry (IM-MS), has been in use for two decades for the analysis of complex biomolecules, and in recent years it has emerged as a powerful technique for the analysis of carbohydrates. For carbohydrates, most studies have focused on the separation and characterization of isomers in biological samples. IM-MS is capable of separating isomeric ions by drift time, and further characterizing them by mass analysis. Applications of IM-MS in carbohydrate analysis are extremely useful and important for understanding many biological mechanisms and for the determination of disease states, although efforts are still needed for higher sensitivity and resolution.

scholarly journals COMPLEX ISSUES ARISING WHILE CONDUCTING RESEARCH ON WHEELCHAIR RAMPS FOR ACCESS TO BUILDINGS BY PERSONS WITH REDUCED MOBILITY AND DETERMINATION OF WHEELCHAIR RAMPS’ COMPLIANCE WITH BUILDING STANDARDS AND REGULATIONS

2020 ◽  
Vol 22 (2) ◽  
Author(s):  
Yu. Petryshyna ◽  
S. Radchenko ◽  
N. Syla
Keyword(s):  
Construction Projects ◽  
Residential Buildings ◽  
Public Buildings ◽  
Limited Mobility ◽  
Standards And Regulations ◽  
Conducting Research ◽  
Reduced Mobility ◽  
Building Standards ◽  
The City

The article outlines issues which arise when conducting research on wheelchair (reconstructed) ramps of existing buildings, technical re-equipment of building porches and buildings or their construction projects for compliance with building standards and regulations. As a method of research we have chosen visual inspection of construction and planning solutions, namely measuring of geometric parameters of over 30 ramps in different districts in the city of Kharkiv has been conducted. Requirements of current building regulations are analyzed, their applicability to public and residential buildings for access by persons with reduced mobility is established. Main types of violations of building standards and regulations while construction of ramps, which create significant obstacles for people with limited mobility to access residential and public buildings, have been identified and systematized. Recommendations are provided regarding the possibility of making necessary changes in the design of ramps and adapted porches of residential and public buildings in order to prevent injury to persons with reduced mobility.

scholarly journals SIMS DETERMINATION OF THE SURFACE LITHIUM DEPLETION ZONE IN Al-Li ALLOYS BY QUANTITATIVE IMAGE ANALYSIS

1987 ◽  
Vol 48 (C3) ◽  
pp. C3-521-C3-526 ◽  
Author(s):  
N. THORNE ◽  
A. DUBUS ◽  
J. M. LANG ◽  
F. DEGREVE ◽  
P. MEYER
Keyword(s):  
Image Analysis ◽  
Quantitative Image Analysis ◽  
Depletion Zone ◽  
Quantitative Image ◽  
Lithium Depletion
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