Characterization of fundamental parameters of a semiconductor laser with an injected optical probe

1993 ◽  
Vol 5 (4) ◽  
pp. 380-382 ◽  
Author(s):  
J.M. Liu ◽  
T.B. Simpson
Keyword(s):  
Semiconductor Laser ◽  
Optical Probe ◽  
Fundamental Parameters

scholarly journals Proteomic Advances in Milk and Dairy Products

Molecules ◽  
2021 ◽  
Vol 26 (13) ◽  
pp. 3832
Author(s):  
Rubén Agregán ◽  
Noemí Echegaray ◽  
María López-Pedrouso ◽  
Radwan Kharabsheh ◽  
Daniel Franco ◽  
...  
Keyword(s):  
Dairy Products ◽  
Two Dimensional Gel Electrophoresis ◽  
Vast Number ◽  
Post Translational Modifications ◽  
Fundamental Parameters ◽  
Complex Fluid ◽  
Proteins And Peptides ◽  
Milk And Dairy Products

Proteomics is a new area of study that in recent decades has provided great advances in the field of medicine. However, its enormous potential for the study of proteomes makes it also applicable to other areas of science. Milk is a highly heterogeneous and complex fluid, where there are numerous genetic variants and isoforms with post-translational modifications (PTMs). Due to the vast number of proteins and peptides existing in its matrix, proteomics is presented as a powerful tool for the characterization of milk samples and their products. The technology developed to date for the separation and characterization of the milk proteome, such as two-dimensional gel electrophoresis (2DE) technology and especially mass spectrometry (MS) have allowed an exhaustive characterization of the proteins and peptides present in milk and dairy products with enormous applications in the industry for the control of fundamental parameters, such as microbiological safety, the guarantee of authenticity, or the control of the transformations carried out, aimed to increase the quality of the final product.

Hydraulic characterization of low flow drip irrigation emitters used in intensive horticultural crops in Almeria (Spain)

2021 ◽  
Author(s):  
María Fátima Moreno-Pérez ◽  
Rafael Baeza-Cano ◽  
José Roldán-Cañas ◽  
Gema Cánovas-Fernández ◽  
Rafael Reyes-Requena
Keyword(s):  
Drip Irrigation ◽  
Low Flow ◽  
Limiting Factor ◽  
Fundamental Parameters ◽  
Horticultural Crops ◽  
Hydraulic Behaviour ◽  
Use Efficiency ◽  
Manufacturing Variation ◽  
Very High

<p>In the present work, a selection of drip irrigation emitters used in greenhouse horticultural crops in the province of Almeria, Spain, were hydraulically evaluated, studying their hydraulic behavior and whether they meet with quality standards. Since manufacturers are offering lower flow emitters less spaced, all drippers tested are low flow. The hydraulic characterization will indicate the discharge and emission uniformity of the manufactured emitters, which are the fundamental parameters for the study of water use efficiency in drip irrigation. In the province of Almeria, water is a limiting factor due to the existence of a semi-arid climate, and, in addition, these limited water resources are used by intensive agriculture which causes a high consumption of these resources.</p><p>In total, 21 emitters have been evaluated, including all possible drippers according to their type of insertion (inline, pinched or online and interlinea), hydraulic behaviour (non-compensating and self-compensating) and, within the compensating ones, (anti-draining and non anti-draining). Its flow rates are between 1 and 2.4 l/h, except for a non-compensating interlina emitter of 3.8 l/h.</p><p>To carry out these tests, the criteria of the ISO 9261:2004 standard have been followed, calculating the coefficient of manufacturing variation and the emitter discharge equation on a test bench located in the La Mojonera Centre (Almeria) of the IFAPA (Andalusian Institute of Agricultural and Fishing Research and Training).</p><p>The results of this study show very good behavior in most of the emitters, and, as a consequence, a low coefficient of manufacturing variation has been obtained. The discharge equation obtained in the laboratory shows a low emisión exponent in the self-compensating emitters, being, therefore, the compensation of the pressures very high in all cases. No statistically significant differences have been found between self-compensating and non-compensating emitters by analysing their manufacturing variation coefficients. Nor have any significant differences been found between self-compensating emitters according to whether they are anti-draining or non-anti-draining, considering also the coefficient of variation. In anti-draining emitters, all closing pressures are not satisfied according to the standard, and are exceeded with very high values. The opening pressure is met for two of the four emitters, and one of those that does not meet it does so with a very large value.</p>

The Application of X-Ray Fluorescence and Diffraction to the Characterization of Environmental Assessment Samples

1981 ◽  
Vol 25 ◽  
pp. 189-194
Author(s):  
Albert C. Censullo ◽  
Frank E. Briden
Keyword(s):  
Computer Program ◽  
Environmental Assessment ◽  
Technical Support ◽  
Support Staff ◽  
Fluorescence Spectrometry ◽  
X Ray ◽  
Fundamental Parameters ◽  
Technical Support Staff

The Technical Support Staff is called upon for analysis of a wide variety of sample types many of which have little sample history. However, it is usually necessary to account for all elements present. For these reasons, x-ray fluorescence spectrometry (XRF) has been a useful tool. Unfortunately, XRF requires the use of a range of standards for each element, the preparation of which could become so time consuming that the advantages of XRF would soon be diluted. Consequently, the utility of the J. W. Criss fundamental parameters computer program was evaluated for samples in which only one standard per element was used and where the standard matrix did not strictly resemble the unknown matrix. Some of the results of these tests on environmental assessment samples are reported here.

Experimental characterization of dielectric properties of carbon nanotube networks

2011 ◽  
Vol 3 (4) ◽  
pp. 465-475
Author(s):  
Mahmoud A. EL Sabbagh
Keyword(s):  
Carbon Nanotube ◽  
Transmission Lines ◽  
Rf Circuits ◽  
Experimental Characterization ◽  
Experimental Realization ◽  
Fundamental Parameters ◽  
Conductive Properties ◽  
Carbon Nanotube Networks ◽  
Planar Transmission Lines

This paper explores the characterization of dielectric and conductive properties of carbon nanotube (CNT) networks. This is carried out by building planar transmission lines where conventional metallic traces are replaced by CNT networks. The proposed transmission lines with CNT networks are presented. Experimental realization and repeated two-port microwave measurements of proposed transmission lines enable the accurate extractions of their fundamental parameters showing percolation effects due to presence of CNT networks. The frequency-dependent phase velocity characteristics show a dramatic reduction compared to the speed of light in vacuum. The large magnitude of extracted complex permittivity for CNT networks also exhibits its percolation performance. The effects of CNTs' bulk density on measured and calculated parameters are explained. The results presented in this paper demonstrate the feasibility and the potential of building transmission lines and radio-frequency (RF) circuits elements using CNT networks.

scholarly journals Accurate Fundamental Stellar Parameters

2009 ◽  
Vol 5 (S265) ◽  
pp. 215-216
Author(s):  
Hans Bruntt
Keyword(s):  
Spectral Type ◽  
Effective Temperature ◽  
Direct Methods ◽  
Space Missions ◽  
Indirect Methods ◽  
Fundamental Parameters ◽  
Spectroscopic Analyses ◽  
Solar Type ◽  
Fundamental Stellar Parameters

AbstractWe combine results from interferometry, asteroseismology and spectroscopic analyses to determine accurate fundamental parameters (mass, radius and effective temperature) of 10 bright solar-type stars covering the H-R diagram from spectral type F5 to K1. Using “direct” techniques that are only weakly model-dependent we determine the mass, radius and effective temperature. We demonstrate that model-dependent or “indirect” methods can be reliably used even for relatively faint single stars for which direct methods are not applicable. This is important for the characterization of the targets of the CoRoT and Kepler space missions.

Characterization of the train-average time–frequency parameters inherent in the low-power picosecond optical pulses generated by the actively mode-locked semiconductor laser with an external single-mode fiber cavity

Optik ◽  
2011 ◽  
Vol 122 (2) ◽  
pp. 136-141 ◽  
Author(s):  
Alexandre S. Shcherbakov ◽  
A.Yu. Kosarsky ◽  
Pedro Moreno Zarate ◽  
Joaquin Campos Acosta ◽  
Yurij V. Il’in ◽  
...  
Keyword(s):  
Low Power ◽  
Semiconductor Laser ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Optical Pulses ◽  
Time Frequency

MBE growth and characterization of semiconductor laser coolers

2009 ◽  
Author(s):  
Andreas Stintz ◽  
Chia-Yeh Li ◽  
Mansoor Sheik-Bahae ◽  
Kevin J. Malloy
Keyword(s):  
Semiconductor Laser ◽  
Mbe Growth
Sign in / Sign up

Export Citation Format

Share Document