Design Optimization of Via Transitions for Broadband Applications

2003 ◽  
Author(s):  
Albert Chee W. Lu ◽  
Wei Fan ◽  
Lai L. Wai ◽  
Lin Jin ◽  
Lee A. Low
Keyword(s):  
Impedance Matching ◽  
Test Vehicle ◽  
Electromagnetic Simulations ◽  
Full Wave ◽  
Resonance Test ◽  
High Bandwidth ◽  
Optimization Methodology ◽  
Key Aspects ◽  
The Impact ◽  
Cavity Effect

This paper describes the two key aspects of via transition optimization methodology: impedance matching and power plane resonance suppression. Ground vias are used to improve the impedance mismatch caused by the via transition and the optimal location of the ground vias at the same time helps to suppress the resonance caused by the cavity effect of the power plane pair. Full-wave electromagnetic simulations were carried out to demonstrate that via transition optimization is able achieve resonance-free high bandwidth operation. Optimal use of ground vias will not only enhance impedance matching but also significantly suppress suppression due to power plane resonance. Test vehicle characterizations were also carried out to demonstrate the impact of ground vias and power plane resonance characteristics on signal integrity.

scholarly journals Electromagnetic Simulations and Measurements of the K-800 Superconducting Cyclotron RF Cavity at INFN-LNS

2021 ◽  
Vol 11 (13) ◽  
pp. 5995
Author(s):  
Giuseppe Torrisi ◽  
Giorgio Sebastiano Mauro ◽  
Lorenzo Neri ◽  
Luciano Allegra ◽  
Antonio Caruso ◽  
...  
Keyword(s):  
Vacuum Chamber ◽  
Impedance Matching ◽  
Three Dimensional ◽  
Rf Cavity ◽  
Electromagnetic Simulations ◽  
Superconducting Cyclotron ◽  
Operating Frequency Range ◽  
Eigenmode Analysis ◽  
Proposed Modification ◽  
The Impact

In this paper, a complete three-dimensional (3D) RF model of the cyclotron coaxial resonator—including the coaxial sliding shorts, the “Liner” vacuum chamber, the coupler, the trimmer, and the high RF voltage “Dee” structures—has been developed. An eigenmode analysis was used to simulate the tuning of the resonator in the operating frequency range of 15–48 MHz obtained by two movable sliding shorts and a trimmer. A driven analysis has been performed in order to compute the |S11| parameter (or impedance matching) of the cavity excited by a movable coaxial power coupler. The numerical simulations have been performed using the different peculiarities of two commercial tools, COMSOL Multiphysics and CST microwave studio. Experimental validation of the developed model is presented. The evidence of an unwanted electric field component, orthogonal to the accelerating field, was discovered and a mitigation is also proposed. The impact of the proposed modification was evaluated by using a 3D beam dynamics code under development in the framework of the Superconducting Cyclotron upgrade ongoing at INFN-LNS.

Particularities of the independent auditor's report on reliability of accounting (financial) statements for 2019: COVID-19 as qualitatively essential information (Part 2)

2020 ◽  
Vol 23 (7) ◽  
pp. 777-799
Author(s):  
O.I. Shvyreva ◽  
Z.I. Kruglyak ◽  
A.V. Petukh
Keyword(s):  
Financial Reporting ◽  
Financial Statements ◽  
Economic Situation ◽  
Risk Disclosure ◽  
Essential Information ◽  
Logical Method ◽  
Annual Reporting ◽  
The Face ◽  
Key Aspects ◽  
The Impact

Subject. This article discusses the issues related to the practice of financial reporting in the face of uncertainties caused by the coronavirus contagion, as well as the specifics of the audit strategy and formation of an audit opinion on this reporting. Objectives. The article aims to identify the quality characteristics of financial reporting prepared in the context of the COVID-19 pandemic and justify the key aspects of assurance engagement completion in an extremely uncertain epidemiological and economic situation. Methods. For the study, we used an abstract-logical method, content analysis techniques, systematization, and classification. Results. Analyzing the impact of the extremely uncertain epidemiological and economic situation on financial statements, the article clarifies aspects of disclosure of events after the reporting date and threats to business continuity in the annual reporting of economic entities. The article identifies possible alternative procedures and algorithms to obtain proper evidence when it is insufficient in the face of the inability to meet certain audit standards requirements in a remote audit environment. The article defines the impact of COVID-19 risk disclosure on the structure of the audit report and opinion. Relevance. The results of the study can be used in the practical activities of economic entities that prepare financial statements in the face of significant uncertainty, as well as auditors and audit organizations.

Problems with the Interpretation of the “Slovak Reformation”

2020 ◽  
Vol 7 (2) ◽  
pp. 305-318
Author(s):  
Eva Kowalská
Keyword(s):  
Ethnic Identity ◽  
Language Policies ◽  
Structural Problems ◽  
Vernacular Language ◽  
Cultural Implications ◽  
The Reformation ◽  
Reformation Movement ◽  
Key Aspects ◽  
The Impact

AbstractStructural problems of communities affected by the “Slovak Reformation,” issues with accepting the situation or simply the relationships among various cultural phenomena, like literacy or language policies, are key aspects in studying the impact of the Reformation in Hungary, especially with respect to Slovaks. Information gathered from the Reformation had a direct and long-lasting impact on the formation of vernacular language, as well as on the search for and the construction of an ethnic identity. Searching for evidence left by the Slovak presence in the Reformation movement thus presents challenging though notable problems for Slovak historiography. The confessional division and its political as well as cultural implications have evoked long-lasting discussions among historians as well as politicians. This study focuses on the most relevant issues within these processes.

scholarly journals Characterization of Tiled Architecture for C-Band 1-Bit Beam-Steering Transmitarray

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1259
Author(s):  
Dmitry Kozlov ◽  
Irina Munina ◽  
Pavel Turalchuk ◽  
Vitalii Kirillov ◽  
Alexey Shitvov ◽  
...  
Keyword(s):  
Communication Systems ◽  
Beam Steering ◽  
Unit Cell ◽  
Electromagnetic Simulations ◽  
Fifth Generation ◽  
Full Wave ◽  
Array Architecture ◽  
Modulation Pattern ◽  
Good Agreement

A new implementation of a beam-steering transmitarray is proposed based on the tiled array architecture. Each pixel of the transmitarray is manufactured as a standalone unit which can be hard-wired for specific transmission characteristics. A set of complementary units, providing reciprocal phase-shifts, can be assembled in a prescribed spatial phase-modulation pattern to perform beam steering and beam forming in a broad spatial range. A compact circuit model of the tiled unit cell is proposed and characterized with full-wave electromagnetic simulations. Waveguide measurements of a prototype unit cell have been carried out. A design example of a tiled 10 × 10-element 1-bit beam-steering transmitarray is presented and its performance benchmarked against the conventional single-panel, i.e., unibody, counterpart. Prototypes of the tiled and single-panel C-band transmitarrays have been fabricated and tested, demonstrating their close performance, good agreement with simulations and a weak effect of fabrication tolerances. The proposed transmitarray antenna configuration has great potential for fifth-generation (5G) communication systems.

scholarly journals Coronavirus, the great toilet paper panic and civilisation

Thesis Eleven ◽  
2021 ◽  
pp. 072551362110331
Author(s):  
Jon Stratton
Keyword(s):  
General Population ◽  
Federal Government ◽  
Perceived Threat ◽  
The Novel ◽  
Social Breakdown ◽  
Toilet Paper ◽  
Western Civilisation ◽  
Novel Coronavirus ◽  
Key Aspects ◽  
The Impact

Panic buying of toilet rolls in Australia began in early March 2020. This was related to the realisation that the novel coronavirus was spreading across the country. To the general population the impact of the virus was unknown. Gradually the federal government started closing the country’s borders. The panic buying of toilet rolls was not unique to Australia. It happened across all societies that used toilet paper rather than water to clean after defecation and urination. However, research suggests that the panic buying was most extreme in Australia. This article argues that the panic buying was closely linked to everyday notions of Western civilisation. Pedestal toilets and toilet paper are key aspects of civilisation and the fear of the loss of toilet paper is connected to anxiety about social breakdown, the loss of civilisation. This is the fear manifested in the perceived threat posed by the virus.

Analysing the Residential Market in Trójmiasto Using Self-Organizing Map

2021 ◽  
Author(s):  
Olgun Aydin ◽  
Krystian Zielinski
Keyword(s):  
Multidimensional Data ◽  
Residential Property ◽  
Self Organizing Map ◽  
Property Market ◽  
Residential Properties ◽  
Price Trends ◽  
Residential Market ◽  
Key Aspects ◽  
The Impact ◽  
Self Organizing

Although the residential property market has strong connections with various sectors, such as construction, logistics, and investment, it works through different dynamics than do other markets; thus, it can be analysed from various perspectives. Researchers and investors are mostly interested in price trends, the impact of external factors on residential property prices, and price prediction. When analysing price trends, it is beneficial to consider multidimensional data that contain attributes of residential properties, such as number of rooms, number of bathrooms, floor number, total floors, and size, as well as proximity to public transport, shops, and banks. Knowing a neighbourhood's key aspects and properties could help investors, real estate development companies, and people looking to buy or rent properties to investigate similar neighbourhoods that may have unusual price trends. In this study, the self-organizing map method was applied to residential property listings in the Trójmiasto area of Poland, where the residential market has recently been quite active. The study aims to group together neighbourhoods and subregions to find similarities between them in terms of price trends and stock. Moreover, this study presents relationships between attributes of residential properties.

Succession and Governance Across Generations: A Comparative Study of the United States and Italy

1999 ◽  
Vol 2 (2) ◽  
pp. 47-56
Author(s):  
Alberto Zanzi ◽  
Colette Dumas
Keyword(s):  
United States ◽  
Comparative Study ◽  
Family Business ◽  
Business Management ◽  
The United States ◽  
Italian Family ◽  
Management Succession ◽  
Key Aspects ◽  
The Impact

This comparative study of American and Italian family-owned firms focuses on two key aspects of family business management: succession and governance. This study also explored the impact of generation on these variables.

Impact of an educational workshop upon psychiatrists’ attitudes towards delirium care

2017 ◽  
Vol 36 (2) ◽  
pp. 89-98
Author(s):  
N. A. O’Regan ◽  
M. M. Mohamad ◽  
D. J. Meagher
Keyword(s):  
Psychological Symptoms ◽  
Dsm 5 ◽  
Knowledge And Attitudes ◽  
Bedside Test ◽  
Behavioural And Psychological Symptoms ◽  
Hypoactive Delirium ◽  
Perceived Relevance ◽  
Key Aspects ◽  
The Impact ◽  
Educational Workshop

ObjectivesImproving knowledge about delirium care is a key target for health care. We describe the implementation of a four-part workshop focusing upon key aspects of delirium care.MethodsAttitudes towards and understanding of delirium diagnosis and management amongst psychiatrists were surveyed before and immediately after an educational workshop.ResultsThere were 62 participants. Pre-workshop, delirium was rated highly relevant to psychiatry. Overall level of confidence in diagnosis was modest, with the behavioural and psychological symptoms of dementia considered the most challenging differential diagnosis. Only nine participants (15%) correctly identified DSM-5 delirium criteria. Preferred assessment of attention varied with six different approaches endorsed. Confidence was higher for managing hyperactive compared with hypoactive delirium (p<0.001). Pharmacotherapy was more frequently endorsed for hyperactive compared with hypoactive presentations, with haloperidol the most popular agent (p<0.001). A total of 41 (66%) participants completed post-workshop assessments. Post-workshop, there were significant increases to the perceived relevance of delirium (p = 0.003), confidence in overall diagnosis (p<0.001) accuracy of awareness of DSM-5 criteria (p<0.001), and confidence in treating different presentations (p<0.001). The Months Backward Test was the preferred bedside test of attention (38/40 respondents).ConclusionsThis interactive educational intervention impacted positively upon knowledge and attitudes amongst psychiatrists towards key aspects of delirium care. Further investigation can examine the impact upon longer term knowledge and behaviour.

scholarly journals Evaluación cualitativa de un programa de intervención psicológica con hombres violentos dentro de la pareja

2011 ◽  
pp. 135
Author(s):  
Santiago Boira Sarto ◽  
Yolanda López del Hoyo ◽  
Lucía Tomás Aragonés ◽  
Ana Rosa Gaspar
Keyword(s):  
Domestic Violence ◽  
Qualitative Analysis ◽  
Therapeutic Alliance ◽  
Discussion Groups ◽  
Prison Sentence ◽  
Key Aspects ◽  
Assessment Strategies ◽  
The Impact

La tardía implantación en España de programas de intervención con hombres maltratadores enfatiza la necesidad de desarrollar investigaciones que maximicen la eficacia de los tratamientos. Hasta el momento, han sido escasos los estudios publicados que evalúen las variables relacionadas con la permanencia o el abandono del tratamiento y su eficacia, y todavía más escasos los que han estudiado este tema desde un punto de vista cualitativo. El objetivo del estudio es identificar aspectos clave en los programas de intervención que puedan mejorar la eficacia de los tratamientos para hombres condenados por un delito de violencia de género a los que se les ha suspendido o sustituido la ejecución de la pena de prisión por la realización del programa terapéutico. Para ello se ha analizado cualitativamente la información obtenida en dos grupos de discusión formados por los psicólogos que aplicaron el programa y distribuidos según el tipo de terapia, individual o grupal.Los resultados reflejan la conveniencia de considerar la especificidad de este contexto de intervención en el diseño de los programas y en la evaluación. Deberán mejorarse las estrategias que aumenten la motivación, la alianza terapéutica y la adherencia de los hombres al tratamiento. Además habrá que ampliar las estrategias de evaluación para que ofrezcan una información cualitativamente diferente y permitan una valoración global del impacto del tratamiento y el riesgo para la víctima.The late implementation in Spain of intervention programmes for male abusers stresses the need to carry out research that can maximise the effectiveness of such treatment. Up till now, very few studies have been published that assess the variables relating to the continuation or abandonment of the treatment and its efficiency, and there are even fewer studies that examine this subject from a qualitative standpoint. The object of the study is to identify key aspects in the intervention programmes that can enhance the efficiency of the treatment offered to men that have been convicted for a crime involving domestic violence, and who have had their prison sentence suspended or commuted to a programme entailing therapy. With this aim in mind, a qualitative analysis is conducted of the data obtained in two discussion groups formed by psychologists who applied the programme and who are distributed in accordance with the type of therapy �individual or group-oriented� they administered.The findings reflect the convenience of considering the specifics of this context of intervention in the design of such programmes, along with their assessment. Strategies should be improved to enhance motivation, and also to strengthen the therapeutic alliance and ensure that the men stick to the treatment. We will also have to broaden our assessment strategies so that they offer data that is qualitatively different and can enable an overall assessment to be made of the impact of the treatment and the risk to the victim.

scholarly journals STUDY ON IMPACT FORCES OF THE UNDERWATER CAVITY PROJECTILE

2016 ◽  
Vol 54 (6) ◽  
pp. 797
Author(s):  
Nguyen Thai Dung ◽  
Nguyen Duc Thuyen
Keyword(s):  
Drag Force ◽  
Impact Force ◽  
Center Of Mass ◽  
Forward Direction ◽  
Cavity Wall ◽  
Impact Point ◽  
Impact Forces ◽  
Underwater Projectile ◽  
The Impact ◽  
Cavity Effect

The motion of the underwater projectile with cavity effect including two motions: the projectile moves in the forward direction, center of mass of the projectile rotation around its nose makes tail of the projectile impacts on the cavity wall. According to, the impact forces occur, they include the drag force at its none, the impact force at impact point. The paper studies the forces occur on during motion of the underwater cavity projectile. Added, this paper considers the effect of the length and distributive projectile to the magnitude of impact force and the drag force of the underwater cavity projectile.

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