scholarly journals An improved analytical method for triple stub matching (Stubs in Parallel)

2021 ◽  
Vol 7 (3) ◽  
pp. 157-187
Author(s):  
Slobodan Babic ◽  
Cevdet Akyel
Keyword(s):  
Transmission Line ◽  
Unique Solution ◽  
Analytical Method ◽  
Power Transfer ◽  
Matching Conditions ◽  
The Third ◽  
Special Cases ◽  
Smith Chart ◽  
Good Agreement

In this paper we give the new improved analytical method of triple stub tuner for matching the load impedances to provide the maximum power transfer between a generator and a load. The stubs are connected in parallel with the line at the appropriate distances from the load. The characteristic impedances of the transmission line and the stabs are different. The paper points on the determination of the length for the first stub near the load. The limit lengths for the first and the second stub are found for which the matching is possible. The length of the third stub is directly obtained from the matching conditions. Even though there is not the unique solution for the triple stub matching we also shoved the existence of unique solutions under some conditions. The special cases are also treated. The results of this method are verified by those obtained using the Smith chart and there are in exceptionally good agreement. Even though there are not many papers on this subject this work could be useful for engineers, and physicist which work in this domain.

scholarly journals An improved analytical method for triple stub matching (stubs in series)

2021 ◽  
Vol 7 (2) ◽  
pp. 103-123
Author(s):  
Slobodan Babic ◽  
Cevdet Akyel
Keyword(s):  
Transmission Line ◽  
Unique Solution ◽  
Standing Wave ◽  
Analytical Method ◽  
Power Transfer ◽  
Matching Conditions ◽  
The Third ◽  
Special Cases ◽  
In Series

In this paper we give the new improved analytical method of triple stub tuner for matching the load impedances to provide the maximum power transfer between a generator and a load. The stubs are connected in series with the line at the appropriate distances from the load. The characteristic impedances of the transmission line and the stabs are different. The paper points on the determination of the length for the first stub near the load. The limit lengths for the first and the second stub are found for which the matching is possible. The length of the third stub is directly obtained from the matching conditions. Event though there is not the unique solution for the triple stub matching, we shoved also the existence of the unique solutions under some conditions. The special cases are also treated. The results of this method are verified by using the standing wave ratio SWR. Event though there are not many papers on this subject this work could be useful for engineers and physicist which work in this domain.

Determination of Bitterness of Olives

1967 ◽  
Vol 50 (5) ◽  
pp. 1194-1195
Author(s):  
S Cohen ◽  
A Lifshitz ◽  
Z Samish
Keyword(s):  
Spectrophotometric Determination ◽  
Analytical Method ◽  
Good Agreement

Abstract An objective analytical method for the estimation of bitterness of fresh and fermented olives has been developed. Results of the bitterness estimation by the proposed method were in good agreement with organoleptic tests performed concomitantly. The method is based on the extraction with acetone of a bitter constituent from the olive, adsorption of possible interfering materials on gelatin and alumina, and spectrophotometric determination of the resulting bitter solution.

scholarly journals THE PROCESS OF HEAT TRANSFER IN TWO-LAYERED CYLINDRICAL BODY

2019 ◽  
Vol 20 (11-12) ◽  
pp. 93-98
Author(s):  
U. V. Vidin ◽  
R. V. Kazakov ◽  
V. S. Zlobin
Keyword(s):  
Heat Transfer ◽  
Heat Conduction ◽  
Boundary Conditions ◽  
Analytical Method ◽  
Analytical Methods ◽  
Cylindrical Body ◽  
Characteristic Equations ◽  
The Third ◽  
Thermal Regimes

Determination of thermal regimes of composite cylindrical bodies by analytical methods leads to the appearance of complex characteristic equations, the solution of which is the determination of eigenvalues. The article considers a relatively simple approximate analytical method for determining the eigenvalues of characteristic equations for a two-layer cylindrical body under boundary conditions of the third kind. This method can also be easily used in more complex formulations of heat conduction problems.

Determination of Overvoltages in Transmission Line Terminations Using a Physical Model

1975 ◽  
Vol 12 (4) ◽  
pp. 367-373 ◽  
Author(s):  
D. F. Binns ◽  
H. Habibollahi
Keyword(s):  
Transmission Line ◽  
Physical Model ◽  
Third Harmonic ◽  
Short Line ◽  
The Third ◽  
Transient Voltage

Switching transients have been studied for a short line terminated by an inductor. Resonance with the third harmonic of the transient voltage in the line can produce a peak of 5 pu in the termination, while the fifth harmonic can produce 4.2 pu. Source inductance reduces these voltages appreciably.

scholarly journals Theoretical study of third virial coefficient with Kihara potential

2018 ◽  
Vol 96 (7) ◽  
pp. 716-718
Author(s):  
E. Somuncu ◽  
B.A. Mamedov ◽  
I.M. Askerov
Keyword(s):  
Virial Coefficient ◽  
Theoretical Study ◽  
The Other ◽  
Accurate Calculation ◽  
The Third ◽  
Kihara Potential ◽  
Third Virial Coefficient ◽  
New Formula ◽  
Good Agreement

In this paper, a new formula has been presented for accurate calculation of the third virial coefficient with Kihara potential. The obtained formula allows us to the determination of thermodynamic properties of imperfect gases. The validity of the formula has been tested by application to some gases C2H6, C3H8, C(CH3)4, and n – C5H12. The obtained results have been compared with the other studies. These comparisons show that the formula developed in this study is in good agreement with the data available in the literature.

Investigations on skeletal growth zones via bone scans as base of determination of optimal time for surgery in mandibular asymmetry

2000 ◽  
Vol 39 (05) ◽  
pp. 121-126 ◽  
Author(s):  
R. Werz ◽  
P. Reuland
Keyword(s):  
Bone Growth ◽  
Region Of Interest ◽  
Tracer Uptake ◽  
Optimal Time ◽  
Mandibular Bone ◽  
The Third ◽  
Mandibular Asymmetry ◽  
Bone Scans ◽  
Epiphyseal Plates

Summary Aim of the study was to find out wether there is a common stop of growth of mandibular bone, so that no individual determination of the optimal time for surgery in patients with asymmetric mandibular bone growth is needed. As there are no epiphyseal plates in the mandibular bone, stop of growth cannot be determined on X-ray films. Methods: Bone scans of 731 patients [687 patients (324 male, 363 female) under 39 y for exact determination of end of growth and 44 (21 male, 23 female) patients over 40 y for evaluation of nongrowth dependant differences in tracer uptake] were reviewed for the study. All the patients were examined 3 hours after injection of 99mTc-DPD. Tracer uptake was measured by region of interest technique in different points of the mandibular bone and in several epiphyseal plates of extremities. Results: Tracer uptake in different epiphyseal plates of the extremities shows strong variation with age and good correlation with reported data of bone growth and closure of the epiphyseal plates. The relative maximum of bone activity is smaller in mandibular bone than in epiphyseal plates, which show well defined peaks, ending at 15-18 years in females and at 18-21 years in males. In contrast, mandibular bone shows no well defined end of growing but a gradually reduction of bone activity which remains higher than bone activity in epiphyseal plates over several years. Conclusion: No well defined end of growth of mandibular bone exists. The optimal age for surgery of asymmetric mandibular bone growth is not before the middle of the third decade of life, bone scans performed earlier for determination of bone growth can be omitted. Bone scans performed at the middle of the third decade of life help to optimize the time of surgical intervention.

THE FACTORS OF CAREER SELF-DETERMINATION OF STUDENTS OF HIGHER EDUCATION INSTITUTIONS

2019 ◽  
Vol 7 (1) ◽  
pp. 9-20
Author(s):  
Inna Yeung
Keyword(s):  
Higher Education ◽  
Higher Education Institutions ◽  
Well Being ◽  
Young Person ◽  
Self Determination ◽  
Full Time ◽  
Actual Problem ◽  
The Third ◽  
The Right

Choice of profession is a social phenomenon that every person has to face in life. Numerous studies convince us that not only the well-being of a person depends on the chosen work, but also his attitude to himself and life in general, therefore, the right and timely professional choice is very important. Research about factors of career self-determination of students of higher education institutions in Ukraine shows that self-determination is an important factor in the socialization of young person, and the factors that determine students' career choices become an actual problem of nowadays. The present study involved full-time and part-time students of Institute of Philology and Mass Communications of Open International University of Human Development "Ukraine" in order to examine the factors of career self-determination of students of higher education institutions (N=189). Diagnostic factors of career self-determination of students studying in the third and fourth year were carried out using the author's questionnaire. Processing of obtained data was carried out using the Excel 2010 program; factorial and comparative analysis were applied. Results of the study showed that initial stage of career self-determination falls down on the third and fourth studying year at the university, when an image of future career and career orientations begin to form. At the same time, the content of career self-determination in this period is contradictory and uncertain, therefore, the implementation of pedagogical support of this process among students is effective.

COMPARATIVE ACTION OF VARIOUS OESTROGENIC COMPOUNDS ON MOUSE VAGINAL SIALIC ACIDS (II)

1969 ◽  
Vol 62 (4) ◽  
pp. 663-670 ◽  
Author(s):  
Lars Carlborg
Keyword(s):  
Sialic Acid ◽  
Response Curve ◽  
Sialic Acids ◽  
Clear Cut ◽  
Suitable Parameter ◽  
Sufficient Degree ◽  
Comparative Action ◽  
Relative Potencies ◽  
Good Agreement

ABSTRACT Oestrogens administered in lower doses than necessary to induce full cornification of the mouse vagina induce mucification. It was shown previously that the degree of mucification could be estimated by quantitative determination of sialic acids. A suitable parameter for oestrogen assay was the measurement of vaginal sialic acid concentration which exhibited a clear cut dose response curve. Eleven assays of various oestrogens were performed with this method. Their estimated relative potencies were in good agreement with other routine oestrogen assays. A statistically sufficient degree of precision was found. The sensitivity was of the same order, or slightly higher, than the Allen-Doisy test.

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