{"title":"Application of multifunctional bioFETs for control in biomedical micro-analyzing systems","authors":"V.S. Mkttchian, A. Poghossian","doi":"10.1109/AEM.1996.872879","DOIUrl":"https://doi.org/10.1109/AEM.1996.872879","url":null,"abstract":"","PeriodicalId":445510,"journal":{"name":"Trans Black Sea Region Symposium on Applied Electromagnetism","volume":"516 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133166621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. Pokhsrarian, K. Petrossian, H. Petrossian, D. Sarkisyan
For passive Q-switching of powerful YAG:Nd lasers thermal properties of passive cell are to be taken account. It is especially true with cw operation, at high average output powers. From this point of view molecular caesium vapours can be of particular interest as a rare gaseous media. It's well known' that at high temperatures two Cs atoms are combined and formed into two atom molecule. This molecules have sufficient absorption near 1 pm and are bleached at low laser intensities. The molecular caesium vapours were used for Q-switching of neodymium-doped pulsed lasers. Here we report the first application of caesium vapours for Q-switching of the cw YAG:Nd laser. The Cs2 vapours has been contained in the glass cell with sapphire windows. The cell temperature defined definitely the vapour pressure and concentration of molecules. The cell operation length was equal to 12 cm. By temperature increasing the Cs2 cell transmission may be reduced up to 40%, that is perfectly sufficient for Q-switching of cw YAG:Nd lasers. The Cs2 cell was placed in lm plane-parallel symmetrical resonator with 0.9 reflection of the coupler. The 2mm diameter aperture has been used to obtain one transverse mode operation. The output parameters of generated pulses such as pulse duration, repetition rate, average power, pulse stability as a function of cell temperature have been investigated. The pump power was constant in the experiments and was equal to 4.4kW.
{"title":"Passive Q-switching of CW YAG:Nd laser by molecular caesium vapour","authors":"K. Pokhsrarian, K. Petrossian, H. Petrossian, D. Sarkisyan","doi":"10.1109/AEM.1996.873156","DOIUrl":"https://doi.org/10.1109/AEM.1996.873156","url":null,"abstract":"For passive Q-switching of powerful YAG:Nd lasers thermal properties of passive cell are to be taken account. It is especially true with cw operation, at high average output powers. From this point of view molecular caesium vapours can be of particular interest as a rare gaseous media. It's well known' that at high temperatures two Cs atoms are combined and formed into two atom molecule. This molecules have sufficient absorption near 1 pm and are bleached at low laser intensities. The molecular caesium vapours were used for Q-switching of neodymium-doped pulsed lasers. Here we report the first application of caesium vapours for Q-switching of the cw YAG:Nd laser. The Cs2 vapours has been contained in the glass cell with sapphire windows. The cell temperature defined definitely the vapour pressure and concentration of molecules. The cell operation length was equal to 12 cm. By temperature increasing the Cs2 cell transmission may be reduced up to 40%, that is perfectly sufficient for Q-switching of cw YAG:Nd lasers. The Cs2 cell was placed in lm plane-parallel symmetrical resonator with 0.9 reflection of the coupler. The 2mm diameter aperture has been used to obtain one transverse mode operation. The output parameters of generated pulses such as pulse duration, repetition rate, average power, pulse stability as a function of cell temperature have been investigated. The pump power was constant in the experiments and was equal to 4.4kW.","PeriodicalId":445510,"journal":{"name":"Trans Black Sea Region Symposium on Applied Electromagnetism","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130132161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Cramariuc, P. Cristea, R. Tuduce, V. Chivu, C. Popp, M. Vasilache
{"title":"Trans black sea region symposium on applied electromagnetism magnetic detection and localization of defects in ferromagnetic pipes","authors":"R. Cramariuc, P. Cristea, R. Tuduce, V. Chivu, C. Popp, M. Vasilache","doi":"10.1109/AEM.1996.873182","DOIUrl":"https://doi.org/10.1109/AEM.1996.873182","url":null,"abstract":"","PeriodicalId":445510,"journal":{"name":"Trans Black Sea Region Symposium on Applied Electromagnetism","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124859085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this paper, we develop a generalized theory of vector finite elements, resulting in a systematic derivation of new higher order edge element shape functions. The elements that are derived are implemented in a three-dimensional scattering problem, in conjunction with a second order conformal boundary condition for rectangular outer surfaces.
{"title":"A generalized theory of higher order vector finite elements and its applications in three-dimensional electromagnetic scattering problems","authors":"T. Yioultsis, T. Tsiboukis","doi":"10.1109/AEM.1996.873066","DOIUrl":"https://doi.org/10.1109/AEM.1996.873066","url":null,"abstract":"In this paper, we develop a generalized theory of vector finite elements, resulting in a systematic derivation of new higher order edge element shape functions. The elements that are derived are implemented in a three-dimensional scattering problem, in conjunction with a second order conformal boundary condition for rectangular outer surfaces.","PeriodicalId":445510,"journal":{"name":"Trans Black Sea Region Symposium on Applied Electromagnetism","volume":"291 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131791775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Dielectric resonator antennas (DRAs) have been reported in the past decade [l] and various operating modes can be excited using different arrangements. Each mode has a unique internal and external field distribution, providing unique radiation characteristics [2]. Only a limited number of modes have been utilised in DRAs, such as the T&s, TMo16, EH111, HE116 and HE136, where the mode nomenclature adopted is reported by Simons et al. [3]. In this paper, the radiation characteristics of a cylindrd DRA excited in the HE116 and HE216 modes are experimentally investigated and compared with the predicted results. The DRA under investigation is shown in Figure 1. The radiating element is a cylinder with radius a = 9.5 mm, height d = 3.0 mm and E~ = 14.2, residing on a metallic plate with dimensions 300 x 300 mm2 and excited using a short coaxial probe. It was observed that the antenna provided highly directional radiation when excited in the H E 2 1 6 mode. The experimental results of the resonant fiequency, radiation pattern, impedance bandwidth, gain and radiation efficiency are summarised in Table 1 and compared with those obtained theoretically. During the presentation of the paper, all the results, together with the radiation patterns, will be discussed.
在过去的十年中，介质谐振器天线(DRAs)已经被报道[1]，并且可以通过不同的安排来激发各种工作模式。每种模式都有独特的内外场分布，提供了独特的辐射特性[2]。DRAs中只使用了有限数量的模态，如T&s、TMo16、EH111、HE116和HE136，其中采用的模态命名法由Simons等人报道[3]。本文通过实验研究了圆柱形DRA在HE116和HE216模式下的辐射特性，并与预测结果进行了比较。正在调查的DRA如图1所示。辐射元件是一个半径a = 9.5 mm，高度d = 3.0 mm, E~ = 14.2的圆柱体，位于尺寸为300 x 300 mm2的金属板上，使用短同轴探头激发。实验结果表明，该天线在he2 - 16模式下被激发时具有很强的方向性。谐振频率、辐射方向图、阻抗带宽、增益和辐射效率的实验结果如表1所示，并与理论计算结果进行了比较。在报告期间，将讨论所有的结果以及辐射模式。
{"title":"A cylindrical dielectric resonator antenna operating at HE/sub 11/spl delta// and HE/sub 21/spl delta// modes","authors":"G. Drossos, Z. Wu, L. Davis","doi":"10.1109/AEM.1996.873127","DOIUrl":"https://doi.org/10.1109/AEM.1996.873127","url":null,"abstract":"Dielectric resonator antennas (DRAs) have been reported in the past decade [l] and various operating modes can be excited using different arrangements. Each mode has a unique internal and external field distribution, providing unique radiation characteristics [2]. Only a limited number of modes have been utilised in DRAs, such as the T&s, TMo16, EH111, HE116 and HE136, where the mode nomenclature adopted is reported by Simons et al. [3]. In this paper, the radiation characteristics of a cylindrd DRA excited in the HE116 and HE216 modes are experimentally investigated and compared with the predicted results. The DRA under investigation is shown in Figure 1. The radiating element is a cylinder with radius a = 9.5 mm, height d = 3.0 mm and E~ = 14.2, residing on a metallic plate with dimensions 300 x 300 mm2 and excited using a short coaxial probe. It was observed that the antenna provided highly directional radiation when excited in the H E 2 1 6 mode. The experimental results of the resonant fiequency, radiation pattern, impedance bandwidth, gain and radiation efficiency are summarised in Table 1 and compared with those obtained theoretically. During the presentation of the paper, all the results, together with the radiation patterns, will be discussed.","PeriodicalId":445510,"journal":{"name":"Trans Black Sea Region Symposium on Applied Electromagnetism","volume":"23 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131830088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The electromagnetic wave diffraction for two bodies","authors":"I. P. Kozlov","doi":"10.1109/AEM.1996.873071","DOIUrl":"https://doi.org/10.1109/AEM.1996.873071","url":null,"abstract":"","PeriodicalId":445510,"journal":{"name":"Trans Black Sea Region Symposium on Applied Electromagnetism","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133885195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
.. . Theory of multifilar helix gratings had been proposed, in [ 11. Using the wellknown representation of multifllar helix as a perfect anisotropically conducting screen the authors have obtained rigorous solution to the problem of diffraction of a normally incident elliptically polarized plane wave by the infinite grating of helically conducting cylinders. Grating characteristics we determined by three independent parameters: pitch angle a, spacing nonnalized to the wavelength s=pJil, and fillfactor .(helix diameter divided by the spacing) q=d/p. Analysis of the numerical results for various a, s, and Q gives the following possible applications of the ' helix gratings in .mfcrowav.e engineering (the helices are assumed to be right-handed). 1. C)ircular wolarization-filtey For the parameters a=35O, s=0.38, ~0.87, one can observe total reflection of the left-handed circularly polarized wave, whereas the right-handed wave is partially transmitted, The phase of the reflection coefficient of the right-handed wave is zero. Consequently, due to the transmission type resonance, the pair-of the identical gratings with the above parameters separated by the distance kd/2 (n= 1,2,3.. .) totally transmits the right7handed circularly polarized wave and totally reflects the left-handed wave. 2. Circular wolurizer - power divider At specified values Qf the parameters a, s and q, the helix grating under consideration divides the power of the incident linearly polarized wave into two parts, with the both transmitted and reflected waves being circularly polarized and having opposite handedness. Reflected wave handedness coincides with the helix handedness. Numerical results show that, at, e.g., a=75O, s=0.23 and q=0.34. the required conditions are satisfied. 3. Isotrowic twist polarizer Unlike an anisotropic twist polarizer, the helix grating can rotate polarization of a linearly polarized wave through a given angle when electric vector of the incident wave is arbitrarily oriented with respect to the grating conductors. Indeed, when the helix ,grating with the parameters a =26.3O, s=0.68, and q=0.57 is illuminated by a: circularly polarized plane wave, the. transmitted wave is circularly polarized as Well, with the polarization being retained. The right-handed and left-handed transmitted waves have equal magnitudes and different phases. Thi phase shift determines that the angle of polarization plane rotation is 39O.
{"title":"Diffraction from multifilar wire helix grating","authors":"A. Chuprin, A. Shatrov, A. Sivov","doi":"10.1109/AEM.1996.873046","DOIUrl":"https://doi.org/10.1109/AEM.1996.873046","url":null,"abstract":".. . Theory of multifilar helix gratings had been proposed, in [ 11. Using the wellknown representation of multifllar helix as a perfect anisotropically conducting screen the authors have obtained rigorous solution to the problem of diffraction of a normally incident elliptically polarized plane wave by the infinite grating of helically conducting cylinders. Grating characteristics we determined by three independent parameters: pitch angle a, spacing nonnalized to the wavelength s=pJil, and fillfactor .(helix diameter divided by the spacing) q=d/p. Analysis of the numerical results for various a, s, and Q gives the following possible applications of the ' helix gratings in .mfcrowav.e engineering (the helices are assumed to be right-handed). 1. C)ircular wolarization-filtey For the parameters a=35O, s=0.38, ~0.87, one can observe total reflection of the left-handed circularly polarized wave, whereas the right-handed wave is partially transmitted, The phase of the reflection coefficient of the right-handed wave is zero. Consequently, due to the transmission type resonance, the pair-of the identical gratings with the above parameters separated by the distance kd/2 (n= 1,2,3.. .) totally transmits the right7handed circularly polarized wave and totally reflects the left-handed wave. 2. Circular wolurizer - power divider At specified values Qf the parameters a, s and q, the helix grating under consideration divides the power of the incident linearly polarized wave into two parts, with the both transmitted and reflected waves being circularly polarized and having opposite handedness. Reflected wave handedness coincides with the helix handedness. Numerical results show that, at, e.g., a=75O, s=0.23 and q=0.34. the required conditions are satisfied. 3. Isotrowic twist polarizer Unlike an anisotropic twist polarizer, the helix grating can rotate polarization of a linearly polarized wave through a given angle when electric vector of the incident wave is arbitrarily oriented with respect to the grating conductors. Indeed, when the helix ,grating with the parameters a =26.3O, s=0.68, and q=0.57 is illuminated by a: circularly polarized plane wave, the. transmitted wave is circularly polarized as Well, with the polarization being retained. The right-handed and left-handed transmitted waves have equal magnitudes and different phases. Thi phase shift determines that the angle of polarization plane rotation is 39O.","PeriodicalId":445510,"journal":{"name":"Trans Black Sea Region Symposium on Applied Electromagnetism","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132808827","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The synthesis of waveguiding structures","authors":"A. N. Bogolyubov, A. Krasilnikova, D. Minaev","doi":"10.1109/AEM.1996.873060","DOIUrl":"https://doi.org/10.1109/AEM.1996.873060","url":null,"abstract":"","PeriodicalId":445510,"journal":{"name":"Trans Black Sea Region Symposium on Applied Electromagnetism","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132615208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We are going to present a Computer Aided Design System for Microwave and high frequency circuits (MICAD). This system deal with the circuit analysis, design and optimisation of amplifiers, oscillators and filters in those frequencies. The designed circuits with MICAD matches very well with their requested performance parameters such as bandwidth, stability, amplification, noise figure. This is verified by many experiments. The system offer to the user the opportunity to use lumped element and/or microstrip components. In the last case, there are taken in account the circuits discontinuity, that permits to use WAD up to tens of GHz. A user friendly graphical interface is offered. MICAD is used to design microwave and high frequency circuits used in several applications. On p the other hand MICAD is a effective tool in the microwave teaching activity in ours laboratories. The MICAD System includes the followings main software modules described in more details in this abstract.
{"title":"A CAD system for microwave circuits","authors":"A. Durresi","doi":"10.1109/AEM.1996.873117","DOIUrl":"https://doi.org/10.1109/AEM.1996.873117","url":null,"abstract":"We are going to present a Computer Aided Design System for Microwave and high frequency circuits (MICAD). This system deal with the circuit analysis, design and optimisation of amplifiers, oscillators and filters in those frequencies. The designed circuits with MICAD matches very well with their requested performance parameters such as bandwidth, stability, amplification, noise figure. This is verified by many experiments. The system offer to the user the opportunity to use lumped element and/or microstrip components. In the last case, there are taken in account the circuits discontinuity, that permits to use WAD up to tens of GHz. A user friendly graphical interface is offered. MICAD is used to design microwave and high frequency circuits used in several applications. On p the other hand MICAD is a effective tool in the microwave teaching activity in ours laboratories. The MICAD System includes the followings main software modules described in more details in this abstract.","PeriodicalId":445510,"journal":{"name":"Trans Black Sea Region Symposium on Applied Electromagnetism","volume":"167 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121313596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Numerical identification of unknown coefficient in helmholtz equation via method of variational imbedding","authors":"C. Christov, T. Marinov","doi":"10.1109/AEM.1996.873038","DOIUrl":"https://doi.org/10.1109/AEM.1996.873038","url":null,"abstract":"","PeriodicalId":445510,"journal":{"name":"Trans Black Sea Region Symposium on Applied Electromagnetism","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123466368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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