Experimental Studies and Kinetic Modelling of a HF Chemical Laser at Low Temperatures

1987 ◽  
pp. 189-192 ◽  
Author(s):  
K. Waichman ◽  
D. Chuchem ◽  
Y. Kalisky
Keyword(s):  
Low Temperatures ◽  
Kinetic Modelling ◽  
Experimental Studies ◽  
Chemical Laser

scholarly journals Evaluation of Fe-Mg Binary Oxide for As (III) Adsorption—Synthesis, Characterization and Kinetic Modelling

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 805
Author(s):  
Saif Ullah Khan ◽  
Rumman Zaidi ◽  
Feroz Shaik ◽  
Izharul Haq Farooqi ◽  
Ameer Azam ◽  
...  
Keyword(s):  
Arsenic Removal ◽  
Kinetic Modelling ◽  
Arsenic Concentration ◽  
Experimental Studies ◽  
Precipitation Method ◽  
Arsenic Adsorption ◽  
Adsorbent Dosage ◽  
X Ray ◽  
Co Precipitation ◽  
Contaminated Waters

Nanotechnology has received much attention in treating contaminated waters. In the present study, a facile co-precipitation method was employed to synthesize a novel iron and magnesium based binary metal oxide using a stoichiometrically fixed amount of FeNO3.9H2O and MgNO3.6H2O in a proportion of molar concentration 1:1 and was later evaluated in removing As (III) from contaminated waters. Characterization of the prepared nanomaterial was done using X-ray diffraction (XRD), scanning electron microscopy (SEM), Energy Dispersive X-Ray Analysis (EDAX) and ultraviolet–visible spectrophotometry (UV-VIS). Experimental studies on batch scale were carried out, examining the effect of varying initial concentrations of metal, adsorbent dosage, application time and initial pH on removal efficiency. Arsenic removal increased on increasing adsorbent dosage (0.1–1 g/L) but trend reversed on increasing initial arsenic concentration attaining qmax of 263.20 mg/g. Adsorption was quite efficient in pH range 4–8. Freundlich fitted better for adsorption isotherm along with following Pseudo-2nd order kinetics. The reusability and effect of co-existing ions on arsenic adsorption, namely SO42−, CO32− and PO43− were also explored with reusability in 1st and 2nd cycles attained adsorptive removal up to 77% and 64% respectively. The prepared nano-adsorbent showed promising results in terms of high arsenic uptake (qmax of 263.20 mg/g) along with facile and cost-effective synthesis. Thus, the co-precipitation technique used in this work is a simple one step procedure without any use of any precursor as compared to most of the other procedures used for synthesis.

scholarly journals Ground-Coupled Natural Circulating Devices (Thermosiphons): A Review of Modeling, Experimental and Development Studies

Inventions ◽  
2019 ◽  
Vol 4 (1) ◽  
pp. 14
Author(s):  
Messaoud Badache ◽  
Zine Aidoun ◽  
Parham Eslami-Nejad ◽  
Daniela Blessent
Keyword(s):  
Heat Transfer ◽  
Heat Exchangers ◽  
Low Temperatures ◽  
Experimental Studies ◽  
Heat Transfer Fluid ◽  
Fluid Circulation ◽  
Ground Heat Exchangers ◽  
Additional Equipment ◽  
Different Types ◽  
Overall Efficiency

Compared to conventional ground heat exchangers that require a separate pump or othermechanical devices to circulate the heat transfer fluid, ground coupled thermosiphons or naturallycirculating ground heat exchangers do not require additional equipment for fluid circulation in theloop. This might lead to a better overall efficiency and much simpler operation. This paper providesa review of the current published literature on the different types of existing ground coupledthermosiphons for use in applications requiring moderate and low temperatures. Effort has beenfocused on their classification according to type, configurations, major designs, and chronologicalyear of apparition. Important technological findings and characteristics are provided in summarytables. Advances are identified in terms of the latest device developments and innovative conceptsof thermosiphon technology used for the heat transfer to and from the soil. Applications arepresented in a novel, well-defined classification in which major ground coupled thermosiphonapplications are categorized in terms of medium and low temperature technologies. Finally,performance evaluation is meticulously discussed in terms of modeling, simulations, parametric,and experimental studies.

ChemInform Abstract: Experimental Studies of Gas-Phase Reactions at Extremely Low Temperatures

ChemInform ◽  
2010 ◽  
Vol 26 (28) ◽  
pp. no-no
Author(s):  
B. R. ROWE ◽  
I. R. SIMS ◽  
P. BOCHEREL ◽  
I. W. M. SMITH
Keyword(s):  
Gas Phase ◽  
Low Temperatures ◽  
Experimental Studies ◽  
Gas Phase Reactions

WEAK LOCALIZATION AND ELECTRON–ELECTRON INTERACTION EFFECTS IN THIN METAL WIRES AND FILMS

2010 ◽  
Vol 24 (12n13) ◽  
pp. 2053-2071
Author(s):  
N. Giordano
Keyword(s):  
Electrical Conduction ◽  
Low Temperatures ◽  
Experimental Studies ◽  
Weak Localization ◽  
Thin Metal ◽  
Electron Interaction ◽  
Length Scales ◽  
Disordered Metals ◽  
Experimental Findings ◽  
Metal Wires

A brief and selective review of experimental studies of electrical conduction in thin metal wires and films at low temperatures is given. This review will illustrate the importance of various length scales and of dimensionality in determining the properties disordered metals. A few intriguing and still unresolved experimental findings are also mentioned.

Experimental studies of growth kinetics of silicon by remote plasma-enhanced chemical vapor deposition at low temperatures

1990 ◽  
Author(s):  
Brian G. Anthony ◽  
Ting-Chen Hsu ◽  
Louis H. Breaux ◽  
Rong Z. Qian ◽  
Sanjay K. Banerjee ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Growth Kinetics ◽  
Vapor Deposition ◽  
Low Temperatures ◽  
Experimental Studies ◽  
Chemical Vapor ◽  
Remote Plasma ◽  
Kinetics Of

scholarly journals Influence of Inversion Symmetry on the Metallic Behaviour in a Dilute Two-dimensional Hole System

2000 ◽  
Vol 53 (4) ◽  
pp. 523 ◽  
Author(s):  
A. R. Hamilton ◽  
M. Y. Simmons ◽  
M. Pepper ◽  
D. A. Ritchie
Keyword(s):  
Low Temperatures ◽  
Experimental Studies ◽  
Inversion Symmetry ◽  
Low Density ◽  
Two Dimensional ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
The Past ◽  
Great Debate ◽  
Temperature Resistivity

In the past five years numerous experimental studies of a wide variety of low disorder two-dimensional (2D) semiconductor systems have revealed an unexpectedly large decrease in the resistance as the temperature is lowered from T ~ 1 K, suggesting the existence of a 2D metal. Although numerous theories have been put forward to explain this metallic-like behaviour (which contradicts the expectations of one parameter scaling theory), its origins, and the question of whether it persists to T = 0, are still subjects of great debate. We present a detailed study of the influence of inversion symmetry on the B = 0 metallic behaviour in a low density GaAs hole gas close to the apparent two-dimensional metal—insulator transition. The strength of the metallic behaviour (determined by the size of the drop in resistance as T→ 0) is found to be almost independent of the electric field across the hole gas, and is predominantly determined by the magnitude of k F l at low temperatures (i.e. by the low temperature resistivity). These results suggest that the shape of the potential well and spin—orbit effects alone cannot account for the existence of metallic behaviour in low density, strongly interacting 2D systems.

Investigation of the parameters of the cooling strength of compression foam when feeding through pumping and hose systems at low temperatures

2021 ◽  
Vol 92 ◽  
pp. 8-19
Author(s):  
M. V. Aleshkov ◽  
◽  
T. G. Merkushkina ◽  
V. D. Fedyaev ◽  
A. S. Gumirov ◽  
...  
Keyword(s):  
Experimental Data ◽  
Mass Flow ◽  
Low Temperatures ◽  
Statistical Data ◽  
Experimental Studies ◽  
Ambient Temperatures ◽  
Measuring Complex ◽  
Negative Temperatures ◽  
Goals And Objectives

Introduction. The article describes a methodology and a program of experimental studies to determine the parameters of the cooling strength of compression foam when feeding through pumping and hose systems at low temperatures. The numerical values of the parameters of the cooling strength of the compression foam when feeding through the fire hose 20 m long are determined. The experimental dependences of the parameters of the cooling strength of the compression foam on the multiplicity and mass flow are obtained. Goals and objectives. A program and methodology for experimental studies to determine the parameters of the intensity of cooling of compression foam when feeding through pumping and hose systems has been developed. To carry out experimental studies, the following tasks were set: - development of a measuring complex for determining the parameters of the cooling strength of compression foam when feeding through pumping and hose systems at negative temperatures; - determination of the physical model of the movement of the compression foam when feeding through the fire hoses; - development of a program and methodology for experimental research to determine the mass flow rate of compression foam. Methods. Methods of mathematical analysis of statistical data obtained during experimental data were used to determine the parameters of the cooling strength of compression foam when feeding through the pumping and hose systems. Results and its discussion. The numerical value of the cooling of the compression foam when feeding through the pumping-hose systems at low temperatures was obtained experimentally, depending on the multiplicity along the length of the hose line. Conclusions. 1. A program and methodology for conducting experimental studies to determine the parameters of the cooling strength of compression foam when feeding through pumping and hose systems at low temperatures has been developed. 2. As a result of the experimental studies, data were obtained on the rates and parameters of the cooling strength of the compression foam when feeding through fire hoses in winter at various negative temperatures. To measure the parameters of the cooling strength of compression foam when feeding through fire hoses at negative ambient temperatures, a measuring complex was developed and assembled. 3. The data obtained will make it possible to evaluate the parameters of the compression strength of foam cooling when feeding through the pumping and hose systems at low temperatures. Keywords: intensity of cooling, compression foam, foam-air mixture, pumping-hose system, foam generating unit, a unit for generating and supplying compression foam, low temperatures

scholarly journals SUPERFLUIDITY IN A GAS OF STRONGLY INTERACTING FERMIONS

2010 ◽  
Vol 24 (20n21) ◽  
pp. 3950-3967
Author(s):  
W. Ketterle ◽  
Y. Shin ◽  
A. Schirotzek ◽  
C. H. Schunk
Keyword(s):  
Spin Polarization ◽  
Low Temperatures ◽  
Normal Component ◽  
Experimental Studies ◽  
Interaction Strength ◽  
Fermi Gas ◽  
Strong Interactions ◽  
Gap Energy ◽  
Spin Polarized ◽  
Pairing Correlations

After an introduction into 100 years of research on superfluidity and the concept of the BCS-BEC crossover, we describe recent experimental studies of a spin-polarized Fermi gas with strong interactions. Tomographically resolving the spatial structure of an inhomogeneous trapped sample, we have mapped out the superfluid phases in the parameter space of temperature, spin polarization, and interaction strength. Phase separation between the superfluid and the normal component occurs at low temperatures, showing spatial discontinuities in the spin polarization. The critical polarization of the normal gas increases with stronger coupling. Beyond a critical interaction strength, all minority atoms pair with majority atoms, and the system can be effectively described as a boson-fermion mixture. Pairing correlations have been studied by RF spectroscopy, determining the fermion pair size and the pairing gap energy in a resonantly interacting superfluid.

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