scholarly journals RANCANG BANGUN EXTERNAL ELECTROMAGNETIC RETARDERS SYSTEM PADA MOTOR 1 PHASA

2016 ◽  
Vol 18 (4) ◽  
pp. 1
Author(s):  
Bima Dicky Anugrah Dewantara ◽  
Saiful Manan
Keyword(s):  
Magnetic Field ◽  
New York ◽  
Eddy Currents ◽  
Focal Point ◽  
Metal Plate ◽  
Rotating Shaft ◽  
Braking System ◽  
Motor Current ◽  
Safety Systems ◽  
The Relationship

Bima Dicky Anugrah Dewantara, Saiful Manan, in this paper explain that Electromagnetic retarders are generally known as electromagnetic inhibitors or brakes, the braking system eliminates most braking mechanics, thereby reducing conventional braking systems. Safety requirements and safety systems are developed and become a focal point of an equipment. Electromagnetic brakes are a safety component with a control system that is easy to control. With this electromagnetic brake, it will reduce maintenance costs, because it only requires a factor of electricity to be able to move it. The braking system uses electromagnetic forces to slow down a movement, which is generally a shaft motion. A dish with non-ferromagnetic metal material is attached to a rotating shaft. The disk is flanked by the side of the stator in the form of an electromagnetic coil system that can generate a magnetic field from electricity. Electric current generates a magnetic field in the coil. And the metal plate that cuts the magnetic field will cause eddy currents on the disk itself. This eddy current will generate a magnetic field whose direction is opposite to the previous magnetic field, thus inhibiting the rotary motion of the shaft. In designing, experimenting and making an External Electromagnetic Retarders System Design on 1 Phase Motor, use the NE 555 IC as the control duty cycle. So that the relationship between braking current and braking time is inversely proportional if the higher the current, the shorter the time it takes for the rotor to stop. And the relationship between braking current and motor current is directly proportional, by increasing the braking current will increase the load on the motor causing the motor current to increase. Keywords: Electromagnetic Retarders, Electromagnetic Brakes, Eddy Flow EffectReferencesTipler, P. 2008. Physics for Scientist volume 2. New York : WH Freeman and Company..Ishaq, M. 2007. Fisika Dasar Elektisitas dan Magnetisme. Yogyakarta: Graha Ilmu.Millman, Halkias, M.Barmawi, dan M.O.Tjia. 1971. Integrated Electronics:Analog and Digital Circuits and Systems. Jakarta : Erlangga.Ramdhani, Mohamad. 2008. Rangkaian Listrik. Jakarta : Erlangga.Bishop, Owen. 2004. Dasar-Dasar Elektronika. Jakarta : Erlangga.Halliday, David. Robert Resnick. 1978. Fisika Jilid II Edisi Ketiga. Jakarta : Erlangga

scholarly journals The loss of energy in metal plates of finite thickness, due to eddy currents produced by alternating magnetic fields

1926 ◽  
Vol 111 (759) ◽  
pp. 604-614 ◽  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Eddy Currents ◽  
Finite Thickness ◽  
Metal Plate ◽  
The Self ◽  
Alternating Magnetic Field ◽  
Metal Plates ◽  
Alternating Magnetic Fields

The induction of eddy currents in metal plates which are subjected to alternating magnetic fields has been discussed by Clerk-Maxwell, J. J. Thomson and many others. When an alternating magnetic field is produced normal to the surface of a metal plate, eddy currents are induced at the surface of the plate, which gradually penetrate its interior, the current dying away as it penetrates more deeply into the metal. The diffusion of the currents into the plate depends upon the self-induction and resistance of the paths along which they flow, and can be calculated by the same kind of formula as is used for determining the conduction of heat through a metal slab.

scholarly journals Design of eddy current brake for electric motorcycle braking system

2021 ◽  
Vol 12 (1) ◽  
pp. 41
Author(s):  
Mufti Reza Aulia Putra ◽  
Muhammad Nizam ◽  
Dominicus Danardono Dwi Prija Tjahjana
Keyword(s):  
Magnetic Field ◽  
Finite Element ◽  
Eddy Current ◽  
Eddy Currents ◽  
Motor Vehicles ◽  
Braking Performance ◽  
Braking System ◽  
Fem Method ◽  
The Magnetic Field ◽  
Aluminum Disk

Braking systems in motor vehicles generally use a braking system that utilizes friction. The braking performance will decrease caused by using friction rapidly. To overcome this, as an alternative, an electromagnetic braking system can be used by utilizing eddy currents, such as eddy current brakes (ECB). Eddy currents are generated when the rotor pass the magnetic field of the electromagnet. The research aim is to design an ECB system. The performance of the disk design will be determined in this study. The study is about the tendency of the ECB properties. The finite element (FEM) method is used by modeling ECB performance. The experimental results were used to validate the result. The test showed the results of braking using aluminum disk showed the best performance in 12.03 Nm. From these results, the combination of the disks is needed by an appropriate disk design.

scholarly journals Kiai dan Blater: Antara Kesalehan dan Kekerasan dalam Dinamika Politik Lokal di Madura

2019 ◽  
Vol 26 (1) ◽  
Author(s):  
Muhammad Adlin Sila
Keyword(s):  
New York ◽  
Local Politics ◽  
Focal Point ◽  
The Other ◽  
Islam And Politics ◽  
Social Actors ◽  
Local Elite ◽  
State And Society ◽  
The Relationship

Yanwar Pribadi. 2018. Islam, State and Society: Local Politics in Madura. New York: RoutledgeThis book talks about the relationship between Islam, state and society in Indonesia with a focal point on local politics in Madura. Specifically, this book tries to explain factors that have shaped the development of contemporary Islam and politics in Madura. One of the main arguments of this book is that local elite figures play greater roles than formal leaders such as village heads or regents in mobilizing communities in Madura. By focusing on both kiai and blater, this book examines the forms of the relationship between Islam and politics on one hand, and between piety and violence on the other. Anthropologically speaking, in order to produce a richer discussion, kiai and blater must be seen as social actors and not as a mere structure in their role of the construction of Islam and political formation in contemporary Indonesia.

scholarly journals Application of Multiple Unipolar Axial Eddy Current Brakes for Lightweight Electric Vehicle Braking

2020 ◽  
Vol 10 (13) ◽  
pp. 4659
Author(s):  
Mufti Reza Aulia Putra ◽  
Muhammad Nizam ◽  
Dominicus Danardono Dwi Prija Tjahjana ◽  
Muhammad Aziz ◽  
Aditya Rio Prabowo
Keyword(s):  
Magnetic Field ◽  
Eddy Current ◽  
Eddy Currents ◽  
Main Role ◽  
Moving Vehicle ◽  
Braking System ◽  
Braking Torque ◽  
Coil Winding ◽  
Compact Design ◽  
The Impact

The braking system in a vehicle has the main role of slowing down the speed or stopping the moving vehicle. Compared to mechanical braking, which utilizes friction, non-contact braking has several advantages, including longer lifetime and less maintenance. One form of non-contact braking systems is the eddy current brake (ECB), an electric braking system that employs eddy currents to operate. This research focuses on the impact of magnetic field sources used in the ECB. In addition, the number of magnetic field sources is also observed. In order to achieve an ECB design that can be easily applied in any types of vehicles, including motorcycles and compact cars, a compact ECB design with an excellent braking torque is required. In this study, a compact design of the ECB is obtained by distributing the required braking torque from the disc brake into multiple electromagnets. Finite element method-based modeling has been performed to study ECB parameters, including the number of coil winding, the number of electromagnets, and the electric current. The results of this study show that the developed compact ECB could produce 93.66% of the torque required for braking.

Eddy currents in a metal plate moving in a steady magnetic field

1968 ◽  
Vol 11 (2) ◽  
pp. 100-102
Author(s):  
G. A. Byuler ◽  
T. A. Lukovskaya
Keyword(s):  
Magnetic Field ◽  
Eddy Currents ◽  
Metal Plate ◽  
Steady Magnetic Field

Die Konstruktion von Natur – Central Park neu besichtigt | The Construction of Nature – Central Park Revisited

2005 ◽  
Vol 156 (8) ◽  
pp. 288-296
Author(s):  
Vittorio Magnago Lampugnani
Keyword(s):  
New York ◽  
Hudson River ◽  
The United States ◽  
Central Park ◽  
Housing Developments ◽  
Hudson River School ◽  
The North ◽  
Man And Nature ◽  
The 19Th Century ◽  
The Relationship

In the first half of the 19th century scientific philosophers in the United States, such as Emerson and Thoreau, began to pursue the relationship between man and nature. Painters from the Hudson River School discovered the rural spaces to the north of New York and began to celebrate the American landscape in their paintings. In many places at this time garden societies were founded, which generated widespread support for the creation of park enclosures While the first such were cemeteries with the character of parks, housing developments on the peripheries of towns were later set in generous park landscapes. However, the centres of the growing American cities also need green spaces and the so-called «park movement»reached a first high point with New York's Central Park. It was not only an experimental field for modern urban elements, but even today is a force of social cohesion.

scholarly journals Are Essential Women’s Healthcare Services Fully Covered? A Comparative Analysis of Policy Documents in Shanghai and New York City from 1978–2017

2021 ◽  
Vol 18 (8) ◽  
pp. 4261
Author(s):  
Qingyu Zhou ◽  
Qinwen Yu ◽  
Xin Wang ◽  
Peiwu Shi ◽  
Qunhong Shen ◽  
...  
Keyword(s):  
New York ◽  
New York City ◽  
Women's Health ◽  
York City ◽  
Healthcare Service ◽  
Healthcare Services ◽  
Coverage Rate ◽  
Policy Documents ◽  
Service Coverage ◽  
The Relationship

This study aimed to analyze the changes in the 10 major categories of women’s healthcare services (WHSs) in Shanghai (SH) and New York City (NYC) from 1978 to 2017, and examine the relationship between these changes and maternal mortality ratio (MMR). Content analysis of available public policy documents concerning women’s health was conducted. Two indicators were designed to represent the delivery of WHSs: The essential women’s healthcare service coverage rate (ESCR) and the assessable essential healthcare service coverage rate (AESCR). Spearman correlation was used to analyze the relationship between the two indicators and MMR. In SH, the ESCR increased from 10% to 90%, AESCR increased from 0% to 90%, and MMR decreased from 24.0/100,000 to 1.01/100,000. In NYC, the ESCR increased from 0% to 80%, the AESCR increased from 0% to 60%, and the MMR decreased from 24.7/100,000 to 21.4/100,000. The MMR significantly decreased as both indicators increased (p < 0.01). Major advances have been made in women’s healthcare in both cities, with SH having a better improvement effect. A common shortcoming for both was the lack of menopausal health service provision. The promotion of women’s health still needs to receive continuous attention from governments of SH and NYC. The experiences of the two cities showed that placing WHSs among policy priorities is effective in improving service status.

Komponisten, Interpreten und Editoren debattieren über Notation

2019 ◽  
Vol 33 (1) ◽  
pp. 64-81
Author(s):  
Dörte Schmidt
Keyword(s):  
New York ◽  
International Association ◽  
Contemporary Music ◽  
Second Step ◽  
John Cage ◽  
Musical Structure ◽  
New Developments ◽  
The Relationship

Abstract The article discusses how new developments in the notation of contemporary music were negotiated within the framework of the Darmstadt Summer Courses and which interests and actors played a role in this. The first part examines the publications and publication projects that emerged in the context of the Notation conference in 1964. The focus is on the interests of institutions such as the International Music Council and the International Association of Music Libraries, in whose name the New York publisher Kurt Stone attempted to persuade the International Music Institute Darmstadt to cooperate and, following on from the debates there, to systematically record various forms of notation together. In a second step, the content of the debates at the conference is examined, with a particular focus on the different and sometimes conflicting perspectives of interpreters and composers. Numerous connections to fundamental aesthetic discussions of the time can be worked out, in particular to the relationship between the composer’s intention and interpretation, which was renegotiated in a form of notation that was individualized to the extreme. Finally, with a view to later discussions, this topic is pointed to the question of the relationship between morphology and musical structure, exemplified by positions of Wolfgang Rihm (1982), Klaus Huber (1988) and John Cage (1990).

scholarly journals Association between Friends’ Use of Nicotine and Cannabis and Intake of both Substances among Adolescents

2021 ◽  
Vol 18 (2) ◽  
pp. 695
Author(s):  
Rachel Herold ◽  
Rachel Boykan ◽  
Allison Eliscu ◽  
Héctor E. Alcalá ◽  
Maciej L. Goniewicz
Keyword(s):  
New York ◽  
Peer Influence ◽  
Behavioral Problems ◽  
Secondary Analysis ◽  
Cannabis Use ◽  
Urinary Biomarker ◽  
Urinary Cotinine ◽  
Multivariable Analyses ◽  
Cannabis Smoking ◽  
The Relationship

Nicotine and cannabis use are common among adolescents and may be associated with behavioral problems, poor academic outcomes and use disorders. The goals of this analysis were the following: (1) Describe the influence of friends’ nicotine and cannabis smoking and vaping on self-reported use. (2) Describe the relationship between friends’ nicotine and cannabis use on participants’ urinary biomarkers of nicotine (cotinine) and cannabis (11-nor-9-carboxy-Δ⁹tetrahydrocannabinol=THC-COOH). This is a secondary analysis of survey and biomarker data collected in adolescents aged 12–21 between April 2017 and April 2018, in Long Island, New York. Bivariate and multivariable analyses were conducted using SPSS 26. A cutoff value of ≥10 ng/mL was used to signify recent usage for urinary cotinine and THC-COOH levels. Over one-third of the 517 surveyed adolescents reported using tobacco and one-third reported using cannabis. A significant relationship between friends’ substance use and self-use was found. For both tobacco and cannabis, over 90% (p < 0.01) of participants with urinary biomarker levels above cutoff had friends who used the respective substance. Friends’ nicotine and friends’ cannabis use were each independently associated with urinary biomarker levels for those substances (for nicotine, beta = 88.29, p = 0.03; for cannabis, beta = 163.58, p = 0.03). Friends’ use of nicotine and cannabis is associated with adolescents’ intake, as well as the physiological exposure to those substances. These findings underscore the importance of including peer influence in the discussion with adolescents about tobacco and cannabis use.

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