scholarly journals Исследование прохождения электронов с энергией 10 keV через керамический макроканал

2021 ◽  
Vol 47 (16) ◽  
pp. 51
Author(s):  
К.А. Вохмянина ◽  
Л.В. Мышеловка ◽  
В.С. Сотникова ◽  
А.А. Кубанкина ◽  
А.Д. Пятигор ◽  
...  
Keyword(s):  
Energy Spectrum ◽  
Irradiation Time ◽  
Experimental Studies ◽  
Incident Beam ◽  
Carbon Deposit ◽  
Inner Surface ◽  
Beam Incident

The paper presents the results of experimental studies of the passage of electrons through a ceramic macrocapillary with energy of 10 keV in the position when the axis of the channel is parallel to the axis of the incident beam. Measurements were made of the current and energy spectrum of electrons passing through the channel, depending on the value of the current of the beam incident into it and the irradiation time of the channel. The change in the transmission of electrons through the sample as a function of time after the formation of a conductive carbon deposit on the inner surface of both ends of the channel is demonstrated.

A Total reflection X-Ray Spectrograph for Fluorescent Analysis of Light Elements

1968 ◽  
Vol 12 ◽  
pp. 496-505 ◽  
Author(s):  
R. D. Davies ◽  
H. K. Herglotz
Keyword(s):  
Critical Angle ◽  
Incident Angle ◽  
Incident Beam ◽  
Wavelength Dependence ◽  
Light Elements ◽  
X Ray ◽  
Beam Incident ◽  
Open Window ◽  
Angle Of Reflection ◽  
Initial Results

AbstractA novel x-ray spectrograph for the analysis of light elements has been developed based on previous computations and confirming experiments by one of as (H. K. Herglotz). The major components of the instrument are an efficient fluorescent source, a totally reflecting mirror, and an open window photomultiplier. Identification of wavelengths in the range 15 < λ < 80 Å is achieved by the wavelength dependence of the critical angle of reflection of an x-ray beam incident on a suitably chosen low absorption reflector. As the incident angle is increased through the critical angle for a particular wavelength, the reflected beam intensity is sharply reduced; hence, a periodic vibration of the incident beam through a small angular range about the critical angle furnishes a strong a.c. reflected signal characteristic of one narrow wavelength band only.Initial results promise a simple, easy-to-operate instrument for the routine analysis of elements boron to fluorine.

Resonantly enhanced second harmonic generation in a one-dimensional GaN-based photonic crystal slab

2004 ◽  
Vol 831 ◽  
Author(s):  
Jérémi Torres ◽  
Marine Le Vassor d'Yerville ◽  
David Cassagne ◽  
René Legros ◽  
Jean-Paul Lascaray ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Second Harmonic ◽  
Incident Beam ◽  
Fundamental Field ◽  
One Dimensional ◽  
Resonance Effects ◽  
Photonic Crystal Slab ◽  
Harmonic Field ◽  
Beam Incident ◽  
Harmonic Conversion

ABSTRACTWe have performed investigations of resonance effects inside a gallium nitride one-dimensional photonic crystal slab in order to enhance the second-harmonic generated from an beam incident on the surface of the slab. Convenient conditions on the incident beam propagation direction and polarization are first identified by experimental or theoretical linear optical studies. Giant enhancements in the second-harmonic conversion have been obtained by comparison with the unpatterned GaN layer. The combined role of the resonant coupling of the fundamental field and of the second-harmonic field has been observed by rotating the polarization of the fundamental beam.

scholarly journals To the determination of heat exchange conditions near the inner surface of walls with reflective thermal insulation from aluminium foil

2018 ◽  
Vol 196 ◽  
pp. 02035 ◽  
Author(s):  
Nina Umnyakova ◽  
Mikhail Gandzhuntsev
Keyword(s):  
Heat Transfer ◽  
Thermal Insulation ◽  
Experimental Studies ◽  
Building Envelope ◽  
Surface Radiation ◽  
Thermal Engineering ◽  
Transfer Coefficients ◽  
Concrete Wall ◽  
Heat Transfer Coefficients ◽  
Inner Surface

Materials with a low coefficient of surface radiation intensively reflect the radiant component of the heat flux and reduce heat losses through the building envelope. When designing building structures with reflective thermal insulation it is necessary to evaluate the efficiency of its application. However, at present there are no methods for calculating the value of thermal losses through external walls in the presence of reflective thermal insulation on internal surface of the wall, as well as there are no data on the values of heat transfer coefficients at the inner surface of building envelope with reflective thermal insulation. In this regard, in the climatic chambers of NIISF RAABS, complex thermal engineering studies were carried out. For this a cellular concrete wall 2,8 x1,2 m was put up into the chamber with reflective thermal insulation on the inner surface and without it. The obtained results of experimental studies, presented in the work, allowed obtaining numerical values of heat transfer coefficients at the inner surface of walls with reflective thermal insulation, and use the obtained data in further calculations.

Energy-analyzing setup for backscattered electrons

1992 ◽  
Vol 50 (2) ◽  
pp. 1268-1269
Author(s):  
Pascal Gérard ◽  
Jean Louis Balladore ◽  
Jean Paul Martinez ◽  
Abdelghafour Ouabbou
Keyword(s):  
Electronic Device ◽  
Detection System ◽  
Incident Beam ◽  
Normal Incidence ◽  
Liquid Nitrogen Temperature ◽  
Emission Angle ◽  
Pin Diode ◽  
Backscattered Electrons ◽  
Beam Incident ◽  
Backscattered Electron

We present in this paper an experimental device for determining for an electron beam incident normal to a target, the angular and energetic backscattered electron distribution as a function of the emission angle. The originality of our setup lies in the fact that under a normal incidence the particules reach the target which remains stationary. The detection system, placed on a rotating arm around the point of impact of the incident beam consists of a semiconductor detector (PIN diode). To enable its use as a detector of electron whose energy is comprised between 10 and 40 keV, a specially tailored electronic device was required. In order to enhance the energy resolution the PIN diode is cooled down at liquid nitrogen temperature.Figure 1 gives an example of the type of spectrum obtained. At a low energy, the electronic noise due the measurement setup appears in the form of the peak at 2 keV, irrespective of the nature of the target, the detection angle θ or the incident energy Eo chosen.

MANAGEMENT OF TECHNOLOGICAL HERITAGE ACCURACY ASSEMBLY OF HIGH-PRECISION PRODUCTS

2020 ◽  
Author(s):  
Aleksandr Yamnikov ◽  
Elena Rodionova ◽  
Ivan Matveev
Keyword(s):  
Research Work ◽  
Experimental Studies ◽  
Rayleigh Distribution ◽  
Distribution Law ◽  
Initial State ◽  
Shape Accuracy ◽  
Inner Surface ◽  
Thin Walled ◽  
The Difference ◽  
Hot Rolled

The article is devoted to solving the problems of the production of thin-walled cases, where it is important to improve the accuracy of manufacturing. Based on the foregoing, it was decided to conduct research work. The technology of processing a long body from a hot-rolled thick-walled pipe using drawing is considered, which guarantees the required shape accuracy and the least effect of the properties of the initial state of the workpiece in comparison with the technology of manufacturing bodies by stamping from sheet metal. As a result of the work, it was determined that the difference in the diameter of the housing bore when basing on the pulling operation is mirrored onto the accuracy of the inner surface of the housing, and the maximum beating of the housing stem obeys the Rayleigh distribution law and fits into the tolerance with a two-fold margin. Experimental studies have shown that an increase in the accuracy of manufacturing extended bodies can be guaranteed by reducing the technological tolerance for the inner base hole of the workpiece for pulling

RESULTS OF RESEARCH TO ASSESS THE EFFECT OF PRE-SOWING UV TREATMENT AND ARTIFICIAL LIGHTING MODES DURING LUPINE GERMINATION ON VITAMIN FEED

2021 ◽  
pp. 36-42
Author(s):  
VLADIMIR YU. STRAKHOV ◽  
◽  
SERGEY V. VENDIN ◽  
YURIY V. SAENKO ◽  
◽  
...  
Keyword(s):  
Experimental Data ◽  
Response Function ◽  
Irradiation Time ◽  
Experimental Studies ◽  
Biologically Active ◽  
Uv Disinfection ◽  
Uv Treatment ◽  
Illumination Time ◽  
Artificial Lighting ◽  
Germinating Seeds

One of the ways to increase the nutritional value of feed is the use of a biologically active additive based on sprouted grain. The positive use of sprouted grain of wheat and barley has been reliably established. At the same time, the possibilities of using sprouted grain of lupine are considered much less frequently. The authors have described technique and presented the results of experimental studies on assessing the eff ect of pre-sowing UV treatment and artifi cial illumination modes during lupine germination on vitamin feed. The time of UV treatment aimed at disinfection before germination and the time of grain illumination with a phytolamp during germination were chosen as the variable factors, and the length of the shoots was chosen as the response function. The range of seed illumination was from 4 to 10 h, and the UV irradiation time was from 60 to 300 s. The germination period was 5 days. Samples exposed to natural light served as control. According to the experimental data, a regression equation was obtained that describes the eff ect of UV disinfection and illumination time during growth on the length of the shoots, and graphical dependences of the change in the response function in the intervals of variation of the infl uencing factors were constructed. Experimental data have shown that an increase in the time of UV disinfection of seeds has a positive eff ect on the length of the shoots. It was revealed that on the fi fth day of germination, the maximum length of shoots (25 mm at 11 mm in control samples) was obtained with preliminary UV disinfection of germinating seeds for 300 s and 4-hour artifi cial illumination with a phytolamp. The expediency of using this technique when germinating lupine seeds for vitamin feed for animals has been experimentally confi rmed.

FT-IR measurement on the damage of Japanese paper induced by PIXE analysis

2021 ◽  
pp. 1950013
Author(s):  
Y. Oguri ◽  
J. Hasegawa ◽  
H. Fukuda ◽  
N. Hagura
Keyword(s):  
Proton Irradiation ◽  
Irradiation Time ◽  
Absorbed Dose ◽  
Incident Beam ◽  
Sample Surface ◽  
Beam Current ◽  
Cultural Property ◽  
Pixe Analysis ◽  
Japanese Paper ◽  
Ft Ir

Analysis of cultural heritage samples by PIXE involves the risk of damaging precious samples due to MeV-proton irradiation. To investigate appropriate methods to detect invisible damage due to PIXE analysis, we analyzed the change in chemical bonding of the sample surface subjected to PIXE and RBS measurement by Fourier Transform InfraRed spectroscopy (FT-IR). We used Japanese hemp paper as a simulated cultural property sample. The proton irradiation for the PIXE/RBS measurement was performed in a vacuum with an incident beam energy of 2.5 MeV, a beam current of 1 nA, and an irradiation time up to 10 min. The corresponding beam flux and fluence were 0.06 nA/mm2 and 4 [Formula: see text]Coulomb/cm2, respectively. When the irradiation time was 10 min, the absorbed dose was 480 kGy on the sample surface. We identified neither change of elemental composition nor visible change such as discoloration due to irradiation. However, we found changes in peak heights in the measured FT-IR spectra, which suggest the destruction of chemical bonds such as O–H and C–O due to proton-induced radiation damage.

scholarly journals Experimental studies on effect of bonding the twisted tape with pins to the inner surface of the circular tube

2014 ◽  
Vol 18 (4) ◽  
pp. 1273-1283 ◽  
Author(s):  
S. Selvam ◽  
Pr. Thiyagarajan ◽  
S. Suresh
Keyword(s):  
Heat Transfer ◽  
Friction Factor ◽  
Experimental Studies ◽  
Twisted Tape ◽  
Constant Wall Temperature ◽  
Tube Heat Exchanger ◽  
Inner Surface ◽  
Fully Developed Turbulent Flow ◽  
Flow Experiments ◽  
Twist Pitch

Heat transfer and friction factor characteristics are studied for water flowing through the tube in tube heat exchanger for two different configurations, namely,(1) twisted tape with pins (TTP) and (2) twisted tape with pins bonded to the inner surface of the test section (TTPB). Experiments are carried out for different twist pitch to the width of the twisted tape ratios (y/w) for TTP and TTPB. But very few research works have been done based on the above mentioned heat transfer enhancement techniques. This paper presents the effect of twisted tape with pins on the heat transfer for a fully developed turbulent flow. Experiments are conducted by maintaining constant wall temperature. The heat transfer rate and pressure drop is found to be high for TTPB of y/w=3.33 when compared to all other configurations. The empirical correlations developed for different twisted tape with pins results in ?7.28% deviation for Nusselt number and ?7.16% for friction factor.

scholarly journals Experimental studies of the transporting capacity of the pipe textured relief trays

2018 ◽  
Vol 251 ◽  
pp. 03033
Author(s):  
Vladimir Orlov ◽  
Irina Dezhina
Keyword(s):  
Suspended Solids ◽  
Protective Coatings ◽  
Experimental Studies ◽  
Practical Significance ◽  
Textured Surfaces ◽  
Black And White ◽  
Theoretical Approaches ◽  
Flow Transport ◽  
Inner Surface

The article presents an analysis of theoretical approaches to assessing the gravity pipeline efficiency in the transportation of water containing suspended solids (the sand). The attention is focused on application of the pipeline protective coatings used in their trenchless repair. Provision has been made of studying the problems of the removal of caked deposits on the pipe walls by creating a special pipeline textured inner surface, representing some kind of a relief, which favors the forced effect of flow turbulence in combination with the hydrophobic properties of the pipeline inner surface. The article presents the results of the research works on the creation of small-size hydraulic benches, which allow determination of the degree of the flow hydrophobicity and the transporting capacity along various textured surfaces (the pipeline protective coatings). The article describes the methods of work on the benches, types of obstacles and the nature of their arrangement along the length of the tray. Provision has been made of different options of the pipeline surface relief further improvement. The photo and film fixation, as well as the black-and-white shadow effects, have enabled presentation of the results of full-scale research experiments on the removal of various size suspended solids from the pipeline tray part. The micro-turbulence phenomena depending on the height of obstacles and their location have been described. The prospects and practical significance of the works aimed at improving the flow transport capacity have been assumed.

Atomistic Simulation of Low-Energy Beam Deposition

1988 ◽  
Vol 100 ◽  
Author(s):  
Brian W. Dodson
Keyword(s):  
Atomistic Simulation ◽  
Incident Beam ◽  
Initial Energy ◽  
Low Energy ◽  
Many Body ◽  
Near Surface ◽  
Energy Beam ◽  
Beam Incident ◽  
Lattice Damage ◽  
Beam Deposition

ABSTRACTLow-energy (50 eV) homoepitaxial beam deposition of silicon is simulated using many-body silicon potentials and molecular dynamics techniques. Results are presented for the case of a 50 eV neutral silicon beam incident on the (2×1) dimer reconstructed Si(100) surface. The beam is aligned along (110) symmetry directions, which are the most natural channeling directions in the silicon lattice. Roughly 10% of the incident beam atoms are scattered from the surface with a small fraction of their initial energy. About half of the incident atoms penetrate the lattice, but scatter strongly and come to rest within 10–15Å of the surface. The remainder are steered accurately into the bulk (110) channels, where they penetrate some 30–100 Å into the lattice. Those atoms which do not undergo bulk channeling cause considerable lattice damage to the near-surface (depth ≥10Å) region.

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