A multi-function resonator based on an asymmetric tri-post rectangular waveguide section

2020 ◽  
Vol 12 (10) ◽  
pp. 1005-1011 ◽  
Author(s):  
Lyudmila P. Mospan ◽  
Sergiy O. Steshenko
Keyword(s):  
Cross Section ◽  
Rectangular Waveguide ◽  
Measurement Data ◽  
Waveguide Resonator ◽  
Waveguide Section ◽  
The Third ◽  
Filtering Function ◽  
Operating Regimes ◽  
Resonant Phenomena

AbstractA novel waveguide resonator is proposed in the paper. The resonator is composed of three rectangular partial-height posts inserted along a rectangular waveguide cross-section. A pair of lateral posts is mounted symmetrically whereas the third antipodal post is centered. The resonator enables bandreject, singlet-type, and pseudoelliptic responses. The operating regimes are achieved by a manipulation with the pair of lateral posts, namely by changing their heights or their locations in a waveguide cross-section. A filtering function is realized as the third mode is exploited as the resonant one. Measurement data are presented for WR90 waveguide. An explanation of the resonant phenomena in post-based sections in terms of eigen regimes and interacting oscillations is proposed.

Studies on Thrombolysis with Streptokinase

1971 ◽  
Vol 25 (02) ◽  
pp. 354-378 ◽  
Author(s):  
R Gottlob ◽  
L Stockinger ◽  
U Pötting ◽  
G Schattenmann
Keyword(s):  
Electron Microscopy ◽  
Cross Section ◽  
Whole Blood ◽  
Jugular Vein ◽  
Thin Sections ◽  
The Third ◽  
Morphological Findings ◽  
Blood Clots ◽  
Arteries And Veins

SummaryIn vitro whole blood clots of various ages, experimental thrombi produced in the jugular vein of rabbits and human thrombi from arteries and veins were examined in semi-thin sections and by means of electron microscopy.In all types of clots examined a typical course of retraction was found. Retraction starts with a dense excentrical focus which grows into a densification ring. After 24 hours the entire clot becomes almost homogeneously dense; later a secondary swelling sets in.Shortly after coagulation the erythrocytes on the rim of the clot are bi-concave discs. They then assume the shape of crenate spheres, turn into smooth spheres and finally become indented ghosts which have lost the largest part of their contents. In the inner zone, which makes up the bulk of the clot, we observed bi-concave discs prior to retraction. After retraction we see no crenations but irregularly shaped erythrocytes. Once the secondary swelling sets in, the cross-section becomes polygonal and later spherical. After extensive hemolysis we observe the “retiform thrombus” made up of ghosts.Experimental and clinical thrombi present the same morphology but are differentiated from in vitro clots by: earlier hemolysis, immigration of leukocytes, formation of a rim layer consisting of fibrin and thrombocytes, and the symptoms of organization. Such symptoms of organization which definitely will prevent lysis with streptokinase were found relatively late in experimental and clinical thrombi. Capillary buds and capillary loops were never found in clinical thrombi prior to the third month.The morphological findings agree with earlier physical and enzymatic investigations. The observation that phenomena of reorganization occur relatively late and frequently only in the rim areas of large thrombi explains why lytic therapy is possible in some of the chronic obliterations.

Photoproduction of Gravitational Radiation in Static Electromagnetic Fields. Radiative Corrections

1975 ◽  
Vol 53 (20) ◽  
pp. 2315-2320 ◽  
Author(s):  
G. Papini ◽  
S. -R. Valluri
Keyword(s):  
Cross Section ◽  
Gravitational Radiation ◽  
Low Energy ◽  
Radiative Corrections ◽  
Third Order ◽  
The Third ◽  
Relativistic Approximation ◽  
Effective Lagrangian ◽  
Charge Renormalization ◽  
Made In

The radiative corrections of second and third order for the process of photoproduction of gravitons in Coulomb and magnetic dipole fields have been calculated.All divergences have been removed either by charge renormalization or regularization. No approximations have been made in the calculation of the second order cross section. In the third order calculation only the extreme relativistic approximation is given. The forms of the effective Lagrangian, corresponding to the low energy approximations have been determined.

scholarly journals THE PLANNING OF ARTIFICIAL RECHARGED WELLS AT PURI BUNGA NIRWANA, BUKIT PERMAI, AND GUNUNG BATU HOUSINGS AT JEMBER

2018 ◽  
Vol 2 (02) ◽  
pp. 119
Author(s):  
Sri Wahyuni ◽  
Gusfan Halik ◽  
Wahyu Sri Wulandari
Keyword(s):  
Cross Section ◽  
Residential Land ◽  
The Third ◽  
Basic Circle

Puri Bunga Nirwana, Bukit Permai, and Gunung Batu Housings are some of the housings that exist in Sumbersari subdistrict. These housings are the third former residential land that was initially able to rainwater seeped into the land of the free but is now covered by housing buildings. The effect of this case is the water cannot go into the land directly but the weather even in times of flooding rains. Therefore, to overcome this problem, it is necessary to do a study and planning of artificially recharged wells in the area. From the result of research with the basic circle and square pad at Puri Bunga Nirwana Housings for the types of houses with an area of 72 m2, 84 m2, and 105 m2 were made artificial recharged wells with a diameter of 1 m and a depth of 2 m. While at Bukit Permai and Gunung Batu Housings for the types of houses with an area of 75 m2, 90 m2, 101 m2, and 202 m2 were made artificial recharged wells with a diameter of 1 m and a depth of 2 m. And the useful cross-section used on each housing is the square cross-section. Perumahan Puri Bunga Nirwana, Perumahan Bukit Permai dan Perumahan Gunung Batu merupakan beberapa perumahan yang ada di Kecamatan Sumbersari. Ketiga perumahan ini dahulunya merupakan lahan yang awalnya mampu meresap air hujan ke dalam tanah secara bebas akan tetapi kini tertutup oleh bangunan-bangunan perumahan. Hal ini menyebabkan air tidak dapat langsung masuk ke dalam tanah tetapi menggenang bahkan banjir di saat hujan turun. Oleh karena itu, untuk mengatasi permasalahan ini perlu dilakukan perencanaan sumur resapan di daerah tersebut. Dari hasil penelitian dengan penampang lingkaran dan penampang persegi pada Perumahan Puri Bunga Nirwana untuk tipe rumah dengan luas 72 m2, 84 m2, dan 105 m2 dibuat sumur resapan dengan diameter 1,0 m dan kedalaman 2,0 m. Pada Perumahan Bukit Permai dan Perumahan Gunung Batu untuk tipe rumah dengan luas 75 m2, 90 m2, 101 m2 dan 202 m2 dibuat sumur resapan dengan diameter 1,0 m dan kedalaman 2,0 m.dari hasil perhitungan diketahui bahwa penampang yang efektif digunakan pada masing-masing perumahan adalah penampang persegi.

scholarly journals Analysis of Timoshenko beam with Koch snowflake cross-section and variable properties in different boundary conditions using finite element method

2021 ◽  
Vol 13 (11) ◽  
pp. 168781402110609
Author(s):  
Hossein Talebi Rostami ◽  
Maryam Fallah Najafabadi ◽  
Davood Domiri Ganji
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Boundary Conditions ◽  
Natural Frequency ◽  
Cross Section ◽  
Timoshenko Beam ◽  
Natural Frequencies ◽  
Variable Properties ◽  
The Third ◽  
Koch Snowflake

This study analyzed a Timoshenko beam with Koch snowflake cross-section in different boundary conditions and for variable properties. The equation of motion was solved by the finite element method and verified by Solidworks simulation in a way that the maximum error was about 2.9% for natural frequencies. Displacement and natural frequency for each case presented and compared to other cases. Significant research achievements illustrate that if we change the Koch snowflake cross-section of the beam from the first iteration to the second, the area and moment of inertia will increase, and we have a 5.2% rise in the first natural frequency. Similarly, by changing the cross-section from the second iteration to the third, a 10.2% growth is observed. Also, the hollow cross-section is considered, which can enlarge the natural frequency by about 26.37% compared to a solid one. Moreover, all the clamped-clamped, hinged-hinged, clamped-free, and free-free boundary conditions have the highest natural frequency for the Timoshenko beam with the third iteration of the Koch snowflake cross-section in solid mode. Finally, examining important physical parameters demonstrates that variable density from a minimum value to the standard value along the beam increases the natural frequencies, while variable elastic modulus decreases it.

scholarly journals Reflection resonances in a rectangular waveguide section with a pair of antipodal rectangular posts

2016 ◽  
Vol 21 (1) ◽  
pp. 15-21
Author(s):  
L. Mospan ◽  
◽  
S. Prikolotin ◽  
А. Кirilenko
Keyword(s):  
Rectangular Waveguide ◽  
Waveguide Section

Visual Processing of the River Cross-Sectional Data

2012 ◽  
Vol 204-208 ◽  
pp. 2726-2730
Author(s):  
Qi Qing Duan ◽  
Rui Hai Wu
Keyword(s):  
Data Processing ◽  
Cross Section ◽  
Visual Processing ◽  
Measurement Data ◽  
Measurement Process ◽  
Cross Section Data ◽  
Section Data ◽  
Section Line ◽  
Straight Line ◽  
The Cross

The cross-section of Hydraulic engineering (river, embankment) is a kind of cross section which is always perpendicular to the river direction. Section line is a straight line which is created by connecting two endpoint of the section. Cross-section measurements is that collecting a coordinate point (X, Y, H) on the section line every a certain distance. Field measurement, due to the influence of the external environment, especially when measured in the river, is difficult to ensure that the location of the measurement point exactly on the straight line shown in the section. The reason is that tracking ship traveling along with the section will be impacted by the water, resulting in the offset along the flow direction. Therefore we must to constantly adjust the direction of travel in the measurement process. For which the measurement data should be processed. So it is necessary to deal with the measurement data, and the idea of visual data was proposed in the paper, which is easier to analyze the accuracy of the measurement data. The BUFFER analysis method was used in the data processing, which effectively removed measurement invalid point that far away from the cross-section in measurement and improved the accuracy of the cross-section data processing. On the other hand, the effective pedal point coordinates was used in the calculation of the plane location of cross-section point. The coordinate which can make the cross-section data more realistic and different from the translation of point and uniform distribution algorithm closeted to the effective point of measurement. The method that the elevation of pedal point on the cross section calculated using the distance weighted interpolation method has been applied in the measurement process of several rivers. It is proved in practice that the method got good results and achieved the accuracy of the data and quality which the application sector requirements on.

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