An angular momentum spinner includes two or more rotating arms loaded with an adjustable sliding block for each arm and laid symmetrically about a rotating center. Each sliding block is controlled to move along the corresponding rotating arm. Such a spinner can display the conservation of angular momentum vividly and intuitively, and can also serve as an amusing toy for children. The spinner can be used as a teaching equipment to demonstrate the theorem of angular momentum conveniently, intuitively and amusingly.
An angular momentum spinner includes two or more rotating arms loaded with an adjustable sliding block
for each arm and laid symmetrically about a rotating center. Each sliding block is controlled to move
along the corresponding rotating arm. Such a spinner can display the conservation of angular momentum
vividly and intuitively, and can also serve as an amusing toy for children. The spinner can be used as a
teaching equipment to demonstrate the theorem of angular momentum conveniently, intuitively and
amusingly.
Comparison between Hamstring Lengthening Tendon and Hamstring Tendon Transfer...Service_supportAssignment
Cerebral Palsy (CP) is defined as a non-progressive brain lesion and has many disorders that may affect both movement and posture (Bobath 1991). Spastic cerebral palsy influence 70% of child population with CP and happen when white matter tracks damage between the cortex and the spinal cord. Moreover, a main problem for children with spastic CP is their feet and leg muscles, which might shorten or tighten around certain joints (Bjorklund 2006). C
A STUDY ON THE MOTION CHANGE UNDER LOADED CONDITION INDUCED BY VIBRATION STIM...csandit
To assist not only motor function but also perception ability of elderly and/or handicapped
persons, the power-assist robots which have perception-assist function have been developed.
These robots can automatically modify the user’s motion when the robot detects inappropriate
user’s motion or a possibility of accident such as collision between the user and obstacles. For
this motion modification in perception-assist, some actuators of power-assist robot are used. On
the other hand, since some elderly persons, handicapped persons or some workers need not use
power-assist function but perception-assist function only, another new concept perception-assist
method was investigated in our previous study. In this perception-assist method, only vibrators
are used for generating motion change with kinesthetic illusion to assist perception-ability only.
In this study, since the perception-assist is often used during tasks under a loaded condition, the
features of motion change under the loaded condition are investigated.
Discus throwing performances and medical classification of wheelchair athlete...Ciro Winckler
CHOW, J. W.; MINDOCK, L. A. Discus throwing performances and medical classification of wheelchair athletes. Medicine and Science in Sports and Exercise, v. 31, n. 9, p. 1272-1279, 1999.
An angular momentum spinner includes two or more rotating arms loaded with an adjustable sliding block
for each arm and laid symmetrically about a rotating center. Each sliding block is controlled to move
along the corresponding rotating arm. Such a spinner can display the conservation of angular momentum
vividly and intuitively, and can also serve as an amusing toy for children. The spinner can be used as a
teaching equipment to demonstrate the theorem of angular momentum conveniently, intuitively and
amusingly.
Comparison between Hamstring Lengthening Tendon and Hamstring Tendon Transfer...Service_supportAssignment
Cerebral Palsy (CP) is defined as a non-progressive brain lesion and has many disorders that may affect both movement and posture (Bobath 1991). Spastic cerebral palsy influence 70% of child population with CP and happen when white matter tracks damage between the cortex and the spinal cord. Moreover, a main problem for children with spastic CP is their feet and leg muscles, which might shorten or tighten around certain joints (Bjorklund 2006). C
A STUDY ON THE MOTION CHANGE UNDER LOADED CONDITION INDUCED BY VIBRATION STIM...csandit
To assist not only motor function but also perception ability of elderly and/or handicapped
persons, the power-assist robots which have perception-assist function have been developed.
These robots can automatically modify the user’s motion when the robot detects inappropriate
user’s motion or a possibility of accident such as collision between the user and obstacles. For
this motion modification in perception-assist, some actuators of power-assist robot are used. On
the other hand, since some elderly persons, handicapped persons or some workers need not use
power-assist function but perception-assist function only, another new concept perception-assist
method was investigated in our previous study. In this perception-assist method, only vibrators
are used for generating motion change with kinesthetic illusion to assist perception-ability only.
In this study, since the perception-assist is often used during tasks under a loaded condition, the
features of motion change under the loaded condition are investigated.
Discus throwing performances and medical classification of wheelchair athlete...Ciro Winckler
CHOW, J. W.; MINDOCK, L. A. Discus throwing performances and medical classification of wheelchair athletes. Medicine and Science in Sports and Exercise, v. 31, n. 9, p. 1272-1279, 1999.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
International Journal of Computational Engineering Research(IJCER)ijceronline
International Journal of Computational Engineering Research(IJCER) is an intentional online Journal in English monthly publishing journal. This Journal publish original research work that contributes significantly to further the scientific knowledge in engineering and Technology.
Introduction to kinesiology (Biomechanics- Physiotherapy) vandana7381
Chapter 1: Introduction to Kinesiology ( Biomechanics) for physical therapy students.
Reference: JOINT STRUCTURE AND FUNCTION - by Pamela K. Levangie.
Easy to understand and with lot of examples.
The relevance of this project is to determine the effect of gyroscopic reaction on bearings. We determine the reactions on bearing due to different spinning angular velocity of rotor and at different precision angular velocity of the system . This concept is useful in selection of bearing during particular application where extra load due to gyroscopic effect occurs on any system.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
International Journal of Computational Engineering Research(IJCER)ijceronline
International Journal of Computational Engineering Research(IJCER) is an intentional online Journal in English monthly publishing journal. This Journal publish original research work that contributes significantly to further the scientific knowledge in engineering and Technology.
Introduction to kinesiology (Biomechanics- Physiotherapy) vandana7381
Chapter 1: Introduction to Kinesiology ( Biomechanics) for physical therapy students.
Reference: JOINT STRUCTURE AND FUNCTION - by Pamela K. Levangie.
Easy to understand and with lot of examples.
The relevance of this project is to determine the effect of gyroscopic reaction on bearings. We determine the reactions on bearing due to different spinning angular velocity of rotor and at different precision angular velocity of the system . This concept is useful in selection of bearing during particular application where extra load due to gyroscopic effect occurs on any system.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Modification of Disc Brakes Using Rotating Brake PadsIOSR Journals
Under the topic ‘Modification of Disc Brakes using Rotating Friction Pads’, I have studied different
components of disc brake which includes rotor, calipers, and fixed friction pads.My main aim is to increase the
braking effect by modifying the existing design by using rotating friction pad. This friction pad is made to rotate
in opposite direction as that of rotor, this is done by using a separate assembly of compound gear train. In this
assembly 2 shafts are used, one shaft is connected between tire and gear and second shaft connects gear and
rotating friction pad. Both the gears are meshed with each other. As the wheel rotates in clockwise direction,
the gear attached to it will also rotate. Other gear which is in meshed position with first gear will rotate in anticlockwise
direction. This will help to move friction pad in anti-clockwise direction as that of wheel’s clockwise
motion. Aim for using rotating friction pad is to provide maximum possible friction which results in retardation
of motion, rotating friction pad not only will provide the friction due to contact but will also provide the friction
due to rotation. Calculations regarding speed of gears, and motion of wheel will clearly elaborate the idea, this
slight modification helps in reducing braking time. Important thing in this innovation is that the energy required
to stop the wheel or disc of brakes is transmitted from wheel only
Analyze ball screw feeding system dynamics simulation Based on the ADAMSIJRES Journal
This paper studied the Nan Jing ’ table with high precision manufacturing,use the software of Solidworks to draw the table,and then import to the ADAMS to establish model of ball screw feeding system virtual prototype.For this system,we research its kinematics and dynamic simulation,and then obtain the simulation curve of torque displacement speed and acceleration.In order to analysis this curve,the result of simulation indicate that the stiffness of ball screw have an important effect on the feeding system,increasing the stiffness of ball screw and adjusting the parameter of ball screw,are valid way to reduce the error of table and then raise the precision of table.
The problem of transferring the patients exists from ancient times. People who get seriously injured or ill were carried by others by means of wooden stretcher with cloth or leather tied to it. Afterwards they were carried on wheels which reduced the effort of the people carrying the patients. Alhough we have evolved in the field of healthcare and technology we are not yet able to address this problem efficiently.
Design, fabrication and performance evaluation of melon shelling machineeSAT Journals
Abstract The design, fabrication and testing of melon shelling machine were carried out. Considering the numerous nutritional and economical importance of the melon seed (Egusi) it is only binding to fashion drudgery free and less expensive means of processing the seed. An insight was carefully taken from previous attempts on this work by various scholars. The machine has a power rating of 1.5hp, power transmitted was 1656.70 wattsand was constructed using basically mildsteel. Performance test was carried out and the machine has efficiency of 62.5% for shelled melon, 10% for unshelled melon, 10% for breakage and 17.5% for partially shelled melon.
Keywords: Design, fabrication, melon seed, shelled, unshelled.
8th International Conference of Information Technology, Control and Automatio...ijics
8th International Conference of Information Technology, Control and Automation (ITCA 2020) will provide an excellent international forum which contributes new results in all areas of Information Technology (IT), Control Systems and Automation Engineering. The conference focuses on all technical and practical aspects of IT, Control Systems and Automation with applications in real-world engineering and scientific problems. The goal of this conference is to bring together researchers and practitioners from academia and industry to focus on information technology, control engineering, automation, modeling concepts and establishing new collaborations in these areas.
International Journal of Instrumentation and Control Systems (IJICS)ijics
International Journal of Instrumentation and Control Systems (IJICS) is a Quarterly open access peer-reviewed journal that publishes articles which contribute new results in all areas of Instrumentation Engineering and Control Systems. The journal focuses on all technical and practical aspects of Instrumentation Engineering and Control Systems. The goal of this journal is to bring together researchers and practitioners from academia and industry to focus on advanced instrumentation engineering, control systems and automation concepts and establishing new collaborations in these areas. Authors are solicited to contribute to this journal by submitting articles that illustrate research results, projects, surveying works and industrial experiences that describe significant advances in the Instrumentation Engineering.
8th International Conference of Information Technology, Control and Automatio...ijics
8th International Conference of Information Technology, Control and Automation (ITCA 2020) will provide an excellent international forum which contributes new results in all areas of Information Technology (IT), Control Systems and Automation Engineering. The conference focuses on all technical and practical aspects of IT, Control Systems and Automation with applications in real-world engineering and scientific problems. The goal of this conference is to bring together researchers and practitioners from academia and industry to focus on information technology, control engineering, automation, modeling concepts and establishing new collaborations in these areas.
A STUDY ON APPLICATION OF BAYES’ THEOREM IN APPIN TECHNOLOGYijics
Mathematics is the only word that conquers the whole world. Mathematics comprises each and every concept that exists in this world. Statistics and probability are the two main concepts that are dealing with the statistical survey of this world. Of these two concepts, Probability has one of the Main applications of dealing with mathematics that is very much useful in real life applications. In this paper, Bayes’ Theorem and its applications are discussed deeply with its application problems using the data which was collected for the company named Appin Technology during the industrial exposure training. This application helped me to give some useful ideas to the company to improve their production level.
8th International Conference of Information Technology, Control and Automatio...ijics
8th International Conference of Information Technology, Control and Automation (ITCA 2020) will provide an excellent international forum which contributes new results in all areas of Information Technology (IT), Control Systems and Automation Engineering. The conference focuses on all technical and practical aspects of IT, Control Systems and Automation with applications in real-world engineering and scientific problems. The goal of this conference is to bring together researchers and practitioners from academia and industry to focus on information technology, control engineering, automation, modeling concepts and establishing new collaborations in these areas.
International Journal of Instrumentation and Control Systems (IJICS)ijics
International Journal of Instrumentation and Control Systems (IJICS) is a Quarterly open access peer-reviewed journal that publishes articles which contribute new results in all areas of Instrumentation Engineering and Control Systems. The journal focuses on all technical and practical aspects of Instrumentation Engineering and Control Systems. The goal of this journal is to bring together researchers and practitioners from academia and industry to focus on advanced instrumentation engineering, control systems and automation concepts and establishing new collaborations in these areas. Authors are solicited to contribute to this journal by submitting articles that illustrate research results, projects, surveying works and industrial experiences that describe significant advances in the Instrumentation Engineering.
International Journal of Instrumentation and Control Systems (IJICS)ijics
International Journal of Instrumentation and Control Systems (IJICS) is a Quarterly open access peer-reviewed journal that publishes articles which contribute new results in all areas of Instrumentation Engineering and Control Systems. The journal focuses on all technical and practical aspects of Instrumentation Engineering and Control Systems. The goal of this journal is to bring together researchers and practitioners from academia and industry to focus on advanced instrumentation engineering, control systems and automation concepts and establishing new collaborations in these areas. Authors are solicited to contribute to this journal by submitting articles that illustrate research results, projects, surveying works and industrial experiences that describe significant advances in the Instrumentation Engineering.
International Journal of Instrumentation and Control Systems (IJICS)ijics
International Journal of Instrumentation and Control Systems (IJICS) is a Quarterly open access peer-reviewed journal that publishes articles which contribute new results in all areas of Instrumentation Engineering and Control Systems. The journal focuses on all technical and practical aspects of Instrumentation Engineering and Control Systems. The goal of this journal is to bring together researchers and practitioners from academia and industry to focus on advanced instrumentation engineering, control systems and automation concepts and establishing new collaborations in these areas. Authors are solicited to contribute to this journal by submitting articles that illustrate research results, projects, surveying works and industrial experiences that describe significant advances in the Instrumentation Engineering.
International Journal of Instrumentation and Control Systems (IJICS)ijics
International Journal of Instrumentation and Control Systems (IJICS) is a Quarterly open access peer-reviewed journal that publishes articles which contribute new results in all areas of Instrumentation Engineering and Control Systems. The journal focuses on all technical and practical aspects of Instrumentation Engineering and Control Systems. The goal of this journal is to bring together researchers and practitioners from academia and industry to focus on advanced instrumentation engineering, control systems and automation concepts and establishing new collaborations in these areas. Authors are solicited to contribute to this journal by submitting articles that illustrate research results, projects, surveying works and industrial experiences that describe significant advances in the Instrumentation Engineering.
International Journal of Instrumentation and Control Systems (IJICS)ijics
International Journal of Instrumentation and Control Systems (IJICS) is a Quarterly open access peer-reviewed journal that publishes articles which contribute new results in all areas of Instrumentation Engineering and Control Systems. The journal focuses on all technical and practical aspects of Instrumentation Engineering and Control Systems. The goal of this journal is to bring together researchers and practitioners from academia and industry to focus on advanced instrumentation engineering, control systems and automation concepts and establishing new collaborations in these areas. Authors are solicited to contribute to this journal by submitting articles that illustrate research results, projects, surveying works and industrial experiences that describe significant advances in the Instrumentation Engineering.
5th International Conference on Networks, Communications, Wireless and Mobile Computing (NCWMC 2020) looks for significant contributions to the Computer Networks, Communications, wireless and mobile computing for wired and wireless networks in theoretical and practical aspects. Original papers are invited on computer Networks, network protocols and wireless networks, Data communication Technologies, network security and mobile computing. The goal of this Conference is to bring together researchers and practitioners from academia and industry to focus on advanced networking concepts and establishing new collaborations in these areas.
International Journal of Instrumentation and Control Systems (IJICS)ijics
International Journal of Instrumentation and Control Systems (IJICS) is a Quarterly open access peer-reviewed journal that publishes articles which contribute new results in all areas of Instrumentation Engineering and Control Systems. The journal focuses on all technical and practical aspects of Instrumentation Engineering and Control Systems. The goal of this journal is to bring together researchers and practitioners from academia and industry to focus on advanced instrumentation engineering, control systems and automation concepts and establishing new collaborations in these areas. Authors are solicited to contribute to this journal by submitting articles that illustrate research results, projects, surveying works and industrial experiences that describe significant advances in the Instrumentation Engineering.
International Journal of Instrumentation and Control Systems (IJICS)ijics
International Journal of Instrumentation and Control Systems (IJICS) is a Quarterly open access peer-reviewed journal that publishes articles which contribute new results in all areas of Instrumentation Engineering and Control Systems. The journal focuses on all technical and practical aspects of Instrumentation Engineering and Control Systems. The goal of this journal is to bring together researchers and practitioners from academia and industry to focus on advanced instrumentation engineering, control systems and automation concepts and establishing new collaborations in these areas. Authors are solicited to contribute to this journal by submitting articles that illustrate research results, projects, surveying works and industrial experiences that describe significant advances in the Instrumentation Engineering.
International Journal of Instrumentation and Control Systems (IJICS)ijics
International Journal of Instrumentation and Control Systems (IJICS) is a Quarterly open access peer-reviewed journal that publishes articles which contribute new results in all areas of Instrumentation Engineering and Control Systems. The journal focuses on all technical and practical aspects of Instrumentation Engineering and Control Systems. The goal of this journal is to bring together researchers and practitioners from academia and industry to focus on advanced instrumentation engineering, control systems and automation concepts and establishing new collaborations in these areas. Authors are solicited to contribute to this journal by submitting articles that illustrate research results, projects, surveying works and industrial experiences that describe significant advances in the Instrumentation Engineering.
International Journal of Instrumentation and Control Systems (IJICS)ijics
International Journal of Instrumentation and Control Systems (IJICS)
ISSN : 2249 - 1147 [Online]; 2319 - 412X [Print]
http://airccse.org/journal/IJICS/ijics.html
Call For Papers
Important Dates
· Submission Deadline : January 11, 2020
· Acceptance Notification : February 11, 2020
· Final Manuscript Due : February 19, 2020
International Journal of Instrumentation and Control Systems (IJICS)ijics
International Journal of Instrumentation and Control Systems (IJICS) is a Quarterly open access peer-reviewed journal that publishes articles which contribute new results in all areas of Instrumentation Engineering and Control Systems. The journal focuses on all technical and practical aspects of Instrumentation Engineering and Control Systems. The goal of this journal is to bring together researchers and practitioners from academia and industry to focus on advanced instrumentation engineering, control systems and automation concepts and establishing new collaborations in these areas. Authors are solicited to contribute to this journal by submitting articles that illustrate research results, projects, surveying works and industrial experiences that describe significant advances in the Instrumentation Engineering.
A STUDY ON APPLICATION OF BAYES’ THEOREM IN APPIN TECHNOLOGYijics
Mathematics is the only word that conquers the whole world. Mathematics comprises each and every concept that exists in this world. Statistics and probability are the two main concepts that are dealing with the statistical survey of this world. Of these two concepts, Probability has one of the Main applications of
dealing with mathematics that is very much useful in real life applications. In this paper, Bayes’ Theorem and its applications are discussed deeply with its application problems using the data which was collected for the company named Appin Technology during the industrial exposure training. This application helped me to give some useful ideas to the company to improve their production level.
Integrating Fault Tolerant Scheme With Feedback Control Scheduling Algorithm ...ijics
In order to provide Quality of Service (QoS) in open and unpredictable environment, Feedback based
Control Scheduling Algorithm (FCSA) is designed to keep the processor utilization at the scheduling
utilization bound. FCSA controls CPU utilization by assigning task periods that optimize overall control
performance, meeting deadlines even if the task execution time is unpredictable and through performance
control feedback loop.
CONTROL OF A HEAT EXCHANGER USING NEURAL NETWORK PREDICTIVE CONTROLLER COMBIN...ijics
The paper presents an advanced control strategy that uses the neural network predictive controller and the
fuzzy controller in the complex control structure with an auxiliary manipulated variable. The controlled
tubular heat exchanger is used for pre-heating of petroleum by hot water. The heat exchanger is modelled
as a nonlinear system with the interval parametric uncertainty. The set point tracking and the disturbance
rejection using intelligent control strategies are investigated. The control objective is to keep the outlet
temperature of the pre-heated petroleum at a reference value. Simulations of control of the tubular heat
exchanger are done in the Matlab/Stimulant environment. The complex control structure with two
controllers is compared with the conventional PID control, fuzzy control and NNPC. Simulation results
confirm the effectiveness and superiority of the complex control structure combining the NNPC with the
auxiliary fuzzy controller.
MULTIPLE LINEAR REGRESSION ANALYSIS FOR PREDICTION OF BOILER LOSSES AND BOILE...ijics
Calculation of boiler efficiency is essential if its parameters need to be controlled for either maintaining or
enhancing its efficiency. But determination of boiler efficiency using conventional method is time
consuming and very expensive. Hence, it is not recommended to find boiler efficiency frequently. The work
presented in this paper deals with establishing the statistical model for boiler efficiency using major boiler
losses. Collected data from an eminent industry shows that the loss due to dry flue gas, loss due to
hydrogen content in fuel and loss due to moisture content in fuel are the major losses. The boiler efficiency
depends mainly on these losses. Multiple regression analysis is used for building the model.
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Vaccine management system project report documentation..pdfKamal Acharya
The Division of Vaccine and Immunization is facing increasing difficulty monitoring vaccines and other commodities distribution once they have been distributed from the national stores. With the introduction of new vaccines, more challenges have been anticipated with this additions posing serious threat to the already over strained vaccine supply chain system in Kenya.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
Quality defects in TMT Bars, Possible causes and Potential Solutions.PrashantGoswami42
Maintaining high-quality standards in the production of TMT bars is crucial for ensuring structural integrity in construction. Addressing common defects through careful monitoring, standardized processes, and advanced technology can significantly improve the quality of TMT bars. Continuous training and adherence to quality control measures will also play a pivotal role in minimizing these defects.
Event Management System Vb Net Project Report.pdfKamal Acharya
In present era, the scopes of information technology growing with a very fast .We do not see any are untouched from this industry. The scope of information technology has become wider includes: Business and industry. Household Business, Communication, Education, Entertainment, Science, Medicine, Engineering, Distance Learning, Weather Forecasting. Carrier Searching and so on.
My project named “Event Management System” is software that store and maintained all events coordinated in college. It also helpful to print related reports. My project will help to record the events coordinated by faculties with their Name, Event subject, date & details in an efficient & effective ways.
In my system we have to make a system by which a user can record all events coordinated by a particular faculty. In our proposed system some more featured are added which differs it from the existing system such as security.
NO1 Uk best vashikaran specialist in delhi vashikaran baba near me online vas...Amil Baba Dawood bangali
Contact with Dawood Bhai Just call on +92322-6382012 and we'll help you. We'll solve all your problems within 12 to 24 hours and with 101% guarantee and with astrology systematic. If you want to take any personal or professional advice then also you can call us on +92322-6382012 , ONLINE LOVE PROBLEM & Other all types of Daily Life Problem's.Then CALL or WHATSAPP us on +92322-6382012 and Get all these problems solutions here by Amil Baba DAWOOD BANGALI
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Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Top 10 Oil and Gas Projects in Saudi Arabia 2024.pdf
ANGULAR MOMENTUM SPINNER
1. International Journal of Instrumentation and Control Systems (IJICS) Vol.8, No.3, July 2018
DOI : 10.5121/ijics.2018.8301 1
ANGULAR MOMENTUM SPINNER
Yizong He1*
and Lijuan You2
1
University of Minnesota, USA
2
Lakes International Language Academy, USA
ABSTRACT
An angular momentum spinner includes two or more rotating arms loaded with an adjustable sliding block
for each arm and laid symmetrically about a rotating center. Each sliding block is controlled to move
along the corresponding rotating arm. Such a spinner can display the conservation of angular momentum
vividly and intuitively, and can also serve as an amusing toy for children. The spinner can be used as a
teaching equipment to demonstrate the theorem of angular momentum conveniently, intuitively and
amusingly.
KEYWORDS
fidget spinner, angular momentum spinner, theorem of angular momentum, law of conservation of angular
momentum, teaching apparatus
1. INTRODUCTION
In 1993, Catherine Hettinger was unable to play with her seven-year-old daughter due to
myasthenia gravis, so she designed a Fidget Spinner serving as a distracting toy shown in Figure
1 [1]. The left photo in Figure 1 is a spinning fidget spinner while the right photo shows the fidget
at rest. The Fidget Spinner is comprised of a ball bearing from which three rotating arms stretch
symmetrically. Although Hettinger’s daughter enjoyed her spinner, the Fidget Spinner was
ignored for more than ten years until 2005. After 2005 small manufacturers started making
various spinners with all kinds of shapes and colors, and marketed them as therapeutic aids for
kids with anxiety or attention deficit, helping them relieve stress and better focus on the task at
hand. Today millions of elementary to senior high school students regard fidget spinners as their
favorite toys. The advantage of the fidget spinner is the simplicity of its structure, making
manufacturing easy with low cost. On the other hand, the structure is so simple making it function
monotonously, rotating only with decreasing speed due to the force of friction.
A common way to demonstrate the theorem of angular momentum is to rotate a man sitting on a
swivel chair, who stretches out and draws back his hands holding a pair of dumbbells [2]. The
revolving speed of both man and chair will change as the distance of the dumbbells with respect
to the rotating center changes. This is a common way used in many universities to demonstrate
the theorem of angular momentum and the law of conservation of angular momentum. Obviously,
it is, in some ways, cumbersome and inconvenient.
Accordingly, the present design concerns an angular momentum spinner comprised mainly of two
ball bearings and two or more rotating arms with a sliding block for each arm. Such a spinner
2. International Journal of Instrumentation and Control Systems (IJICS) Vol.8, No.3, July 2018
2
combines both the function of the existing fidget spinner and the function of regulating revolving
speed with ease, which demonstrates skillfully the theorem of angular momentum and the law of
conservation of angular momentum.
2. THE STRUCTURE OF ANGULAR MOMENTUM SPINNER
Figure 1 Existing fidget spinner
Figure 2 Cross-section of an angular momentum spinner.
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Figure 3 A cross-section of the rotating arm and ball bearing
Figure 4 Stereograms of the rotating arm and cylindrical pedestal with a baffle for driving the rotating arms
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Figure 5 Detailed picture of the outer ring of the base bearing and a soft spline to revolve the rotating arms
To achieve both functions of a fidget spinner and a teaching apparatus to demonstrate the theorem
of angular momentum, the present device includes mainly two ball bearings, a U-groove track
roller, rotating arms and sliding blocks. The more detailed descriptions are as following:
Figure 2 illustrates a cross-section of the overall perspective of an angular momentum spinner.
Figure 3, 4 and 5 are merely supplementary to Figure 2. A ball bearing is defined as small metal
balls placed between the moving parts of a machine to make the parts move smoothly.
A base ball bearing 201 and lifter ball bearing 202 are laid concentrically. 202 is restrained to
cylindrical pedestal 204 by lifter spring 210. A baffle is installed on the edge of 204 in order to
form a gap for a soft spline to drive the rotating arms shown in Figure 5. The outer ring of 201 is
connected to rigid rotating arm 206. A steel connecting wire 208 is bound to the outer ring of 202
which pulls 207 when 202 is moved downwards. 208 sits astride a U-groove track roller 203
which is connected to the rotating arm by fastening arm 205. A sliding block 207 slides back and
forth on 206 by pressing and releasing 202. After the rotating arm is kicked off to revolve by the
soft spline 404 (shown in Figure 5) or by hand, based on the theorem of angular momentum, all
the rotating arms start to revolve and their speed can be regulated continuously by making 202
move up and down.
Figure 3 is a cross-section of the rotating arm 206 and sliding block 207 consisting of two
identical ball bearings 304 connected by cylindrical connector 302. Also, the cross-section of 304
illustrates a convex outer ring 305 and inner ring 306, separator 307 and steel balls 308. In order
to keep the rotating block from slipping off the track of 206, the outer ring of the ball bearing is
made to be convex. Both ends of rotating arm are blocked by rectangular baffles.
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Pressing and releasing 202, the sliding block moves back and forth along the pedestal of rotating
arm 206 between the two rectangular baffles 209. A rectangular window is carved out from the
roof of rotating arm 302 so that the connecting wire 208 can connect 207 and outer ring 202.
Figure 4 shows a perspective view of parts 301 and 303 of the rotating arm of the spinner of Fig.
2. and also shows a perspective view of the cylindrical pedestal of the spinner with a post to limit
the range of motion of a soft spline to drive rotating arms.
Figure 5 illustrates the structure of outer ring 401, 402 with a spline 403 for revolving the rotating
arm by pulling a soft spline 404 quickly which goes through the gap between outer ring of 201
and a baffle 211.
3. ILLUSTRATE THE PRINCIPLE OF ANGULAR MOMENTUM
An angular momentum spinner serves as both a toy for entertaining students and as a teaching
apparatus to demonstrate the theorem of angular momentum at universities.
It is necessary to introduce the theorem of angular momentum in order to appreciate the principle
of regulating revolving speed. Consider a particle of mass m, moving with velocity vector v
relative to some inertial frame. The origin of the coordinate frame is denoted O. The particle has
the momentum m v relative to the inertial frame. We define the angular momentum L relative to
O as r × mv. The cross symbol × between two vectors describes the vector cross product. The
product r × F is called the torque on the particle with respect to the point O. Based on the above,
the theorem states that the rate of change of the angular momentum of a particle around some
point O equals the torque on the particle, with respect to O: namely d( r ×mv )/dt = r × F . If the
net external torque on the particle is zero, then d( r ×m v )/dt = 0. Integrating both sides gets r ×
mv = C. Thus the angular momentum of a particle is conserved if and only if the net external
torque acting on a particle is zero, namely the law of conservation of angular momentum.
The principle of regulating revolving speed can be described by the following formulas: exert
force F to the lifter ball bearing 202, r × F = 0, because the direction of radius vector and force F
are always either parallel or antiparallel. Therefore, the motion of the sliding block obeys the law
of conservation of angular momentum mv2r2 − mv1r1 = 0 , where mv2r2 =| r2 ×mv2 | and mv1r1 =
| r1 ×mv1 |. The relationship between net force F to press 202, work done to sliding block,
rotating speed v of sliding block and the radius r can be express as following equations:
mv2r2 = mv1r1 Eq. (1)
where the sliding block moves from initial position r1 to final r2 ( r1 > r2 ), When the activator
stops pressing 202, F = 0, 202 goes up to initial position due to the lifter spring action and the
centrifugal force of sliding block. Pressing and then releasing causes the sliding block to move
back and forth until the rotating speed decreases to zero due to the small friction force.
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After the rotating arms are driven to move, the revolving motion can last for a period of time,
because of the small friction force due to the use of a ball bearing. Pressing the lifter ball bearing
down causes the revolving speed to go up accordingly. Convervely, ceasing to press the lifter ball
bearing makes the revolving radius increase, resulting in the revolving speed decreasing linearly,
obeying the law of conservation of angular momentum.
4. DISCUSSION
Generally speaking, moving objects easily attract a human being’s attention, such as the blinking
from turn signals on vehicles, or the waving one’s hand in crowd are all easy to spotted. Based on
continual and fast movement, the fidget spinner has become a favorite toy for most teenage
students
What characterizes a fidget spinner is its structural simplicity and its movement. The structure
made manufacturing easy, while the movement properties made it fascinating. By comparison,
the process to manufacture an angular momentum spinner is more complex to some extent.
However, the function which allows a person to regulate the spinner speed lexturely increases its
interest considerably. What is more, the angular momentum spinner can serve as a good teaching
apparatus to demonstrate both the laws of angular momentum and conservation of angular
momentum. A good teaching tool is essential for illustrating the abstruse scientific theory. The
number of rotating arms could vary from two to many more. Also, the size could range from the
same size as current fidget spinners to much larger for use in universities. In a word, an angular
momentum spinner surely serves as an amusing toy and useful teaching tool.
REFERENCES
[1] https://en.wikipedia.org/wiki/Fidget_spinner
[2] https://en.wikipedia.org/wiki/Angular_momentum