Designing a Polymer Gear for Use in the Environment of an Internal Combustion Engine

2011 ◽  
Author(s):  
Rod Kleiss ◽  
Frank J. Ferfecki
Keyword(s):  
Combustion Engine ◽  
Material Selection ◽  
Consumer Products ◽  
Balance System ◽  
Gear Design ◽  
The Past ◽  
System A ◽  
Injection Molded

Much has been written about the advances in polymer gearing over the past few years. After fitful starts in toys and consumer products, the design and quality of these gears have improved dramatically. Materials advances over the past 20 years have been significant as well. This paper describes the methodology of designing a net shape PolyEtherEtherKetone (PEEK) injection molded gear for an automotive mass balance system. The case study referenced (ref 1) shows that, when compared to the high quality ground iron gears in the same system, a net shape injection molded PEEK polymer gear provides a 3db noise reduction, as much as 9% reduction in power consumption, a 69% mass reduction and meets the application durability requirements. The paper describes the design of the injection molded gear’s unique tooth profile, material selection, part design, mold design, and inspection methods. The paper focuses on the differences in gear design and inspection methods between injection molded gears and their metal counterparts.

Technology and Hospital Information System: A Case of Implementation of Electronic Clinical Records in Hospital Maternity Irene Neto in Lubango, Angola

2019 ◽  
Vol 10 (11) ◽  
pp. 1131-1135
Author(s):  
Tomas Hambili Paulo Sanjuluca ◽  
◽  
Ricardo Correia ◽  
Anabela Antunes de Almeida ◽  
Ana Gloria Diaz Martinez ◽  
...  
Keyword(s):  
Maternity Hospital ◽  
Management Support ◽  
Retrospective Case ◽  
System A ◽  
Clinical Records ◽  
Retrospective Case Study ◽  
The Impact ◽  
And Child Health

Introduction: In order to have a good assessment of the quality of maternal and child health care, it is essential that there is up-to-date and reliable information. Objective: To evaluate the impact of the implementation of a computerized database of clinical processes in the admission, archive and medical statistics section, of Maternity hospital Irene Neto/Lubango-Angola. Methodology: A descriptive study with a quantitative and qualitative approach to carry out a retrospective case study deliveries and newborns, records from 2014 to 2017. Final considerations: The implementation of this project may contribute to the improvement of clinical management support management of the hospital as well as facilitating access to information for research and scientific production.

scholarly journals What Did Kuwait Learn from Its Participation in TIMSS Study? An Exploratory Case Study from Senior Supervisors’ Perspectives

2015 ◽  
Vol 11 (27) ◽  
pp. 298 ◽  
Author(s):  
Fatimah Alhashem ◽  
Ali Alkandari
Keyword(s):  
Math Education ◽  
Ministry Of Education ◽  
Curriculum Assessment ◽  
The Past ◽  
Quality Of Teaching ◽  
Low Performance ◽  
Science Supervisors ◽  
Mathematics And Science

The low performance of The Trends of Mathematics and Science Study (TIMSS) results were investigated in depth through interviews with math and science supervisors from the Ministry of Education in Kuwait. A qualitative approach was employed to consider the factors that may affect TIMSS results in the past and understand the reasons of TIMSS results. The outcome of this study was limited to the perspectives of science and math supervisors who participated or worked in the TIMSS study. Their participation in TIMSS was positive even if the results of the study were not because it helped initiate reform in curriculum, assessment, and quality of teaching. However, the participants expressed concerns and variables that need to be aware of in order to perform better not only in TIMSS but also in science and math education in general.

Study of the Structural Characteristics of Mold for Precise Injection Molding

2011 ◽  
Vol 291-294 ◽  
pp. 610-613
Author(s):  
Hong Lin Li ◽  
Zhi Xin Jia
Keyword(s):  
Injection Molding ◽  
Process Parameters ◽  
Structural Characteristics ◽  
Injection Mold ◽  
Industrial Products ◽  
Balance System ◽  
Molded Parts ◽  
Manufacturing Accuracy ◽  
Injection Molded

With the improvement of accuracy requirements for industrial products, the precise injection molding is replacing the traditional injection molding quickly and widely. Many factors influence the quality of injection-molded parts greatly, such as the property of the plastics, mold structure and the manufacturing accuracy, injecting machine and the injecting process parameters. In this paper, the work is emphasized for the influence of mold structure on the quality of injection-molded parts. Eight portions of injection mold are analyzed, including the cavities and cores, the guide components, the runner system, the ejection system, the side-core pulling mechanism, the temperature balance system, the venting system and the supporting parts. The structural characteristics of the above eight portions are presented.

scholarly journals RE-USE OF FORMER INDUSTRIAL AREAS AND THE RESULTING TRANSFORMATION OF ITS CITYSCAPE. CASE STUDY IN HAMBURG, GERMANY

2012 ◽  
Vol 8 (1) ◽  
pp. 133-144
Author(s):  
Anna Marta Włodarczyk
Keyword(s):  
Open Space ◽  
Industrial Areas ◽  
Functional Changes ◽  
The Public ◽  
The Past ◽  
Public Open Space ◽  
Big Cities

Neglected sites in central parts of cities, where in the past an industry was placed, are nowadays (since about 2000) being intensively transformed in big cities of Europe. Functional changes in these areas are causing in consequence spatial and cityscape changes. The presented example of Hamburg HafenCity shows present possibilities for use of former harbours in innercity spaces. Conclusions of the paper refer to the quality of the process of harbour transformation, considering the public open space and the accompanying cityscapes.

scholarly journals A Comprehensive Review on Multiband Reconfigurable Antenna

2021 ◽  
pp. 377-388
Author(s):  
Preeti Rani ◽  
◽  
Tejbir Singh ◽  
Meenu Kaushik ◽  
Vishant Gahlaut
Keyword(s):  
Wireless Communication ◽  
High Performance ◽  
Wireless System ◽  
The Past ◽  
Multiband Antennas ◽  
Single Antenna ◽  
Interference Level ◽  
System A ◽  
New Generation

The advancement of wireless communication is markedly accountable from the past two decades. A variety of designs and techniques have been established in the domain of reconfigurable multiband antennas for different wireless services. Now a days, a high quality of communication with reduced size is required for new generation wireless system. A multiband reconfigurable functionality offers a flexible and high-performance design by single antenna only. A brief review on multiband antenna with different reconfigurable techniques is presented in this paper. Moreover, the new possibilities for future wireless communication system have been demonstrated. A reconfigurable system along with minimal interference level over the fixed or non-reconfigurable transceivers has been discussed in detail.

scholarly journals An Overview of the Reliability Analysis Methods of Tunneling Equipment

2020 ◽  
Vol 14 (1) ◽  
pp. 218-229
Author(s):  
Sina Ahmadi ◽  
Mohsen Hajihassani ◽  
S. Moosazadeh ◽  
H. Moomivand
Keyword(s):  
Reliability Analysis ◽  
Labor Costs ◽  
Goods And Services ◽  
The Past ◽  
Negative Results ◽  
System A ◽  
Equipment Reliability ◽  
Tree Methods ◽  
The Cost

The absolute prevention of damage occurrence is not possible, thus reducing the probability of failure in a system and its impact is very important regarding the operation of a whole system. A failure in a system or in its subsystems makes negative results such as the stop in the production process, rising labor costs, and increasing the cost of maintenance. Reliability, in recent years, is mentioned as one of the most significant aspects of the quality of goods and services. In the past, reliability concerned sensitive and complex industries such as military, nuclear, and aerospace where the lack of their reliability could cause irreparable damage to the entire system. However, today it has become a universal concern. Tunneling equipment has grown in size and complexity and therefore, lack of reliability may cause massive costs to this equipment. Therefore, reliability determination in order to identify the components and subsystems with low reliability is essential. The aim of this study is to review the methods of tunneling equipment reliability analysis including statistical analysis, failure mode and effects analysis, Markov and fault tree methods. In addition, previous available research on the reliability analysis of tunneling equipment is presented.

scholarly journals Assessing Resilience of Urban Critical Infrastructure Networks: A Case Study of Ahvaz, Iran

2020 ◽  
Vol 12 (9) ◽  
pp. 3691 ◽  
Author(s):  
Hadi Alizadeh ◽  
Ayyoob Sharifi
Keyword(s):  
Service Provision ◽  
Design Pattern ◽  
Critical Infrastructure ◽  
Policy Makers ◽  
Infrastructure Networks ◽  
The Past ◽  
The City ◽  
Different Parts

Cities around the world increasingly recognize the need to build on their resilience to deal with the converging forces of urbanization and climate change. Given the significance of critical infrastructure for maintaining quality of life in cities, improving their resilience is of high importance to planners and policy makers. The main purpose of this study is to spatially analyze the resilience of water, electricity, and gas critical infrastructure networks in Ahvaz, a major Iranian city that has been hit by various disastrous events over the past few years. Towards this goal, we first conducted a two-round Delphi survey to identify criteria that can be used for determining resilience of critical infrastructure networks across different parts of the city. The selected criteria that were used for spatial analysis are related to the physical texture, the design pattern, and the scale of service provision of the critical infrastructure networks. Results showed that, overall, critical infrastructure networks in Ahvaz do not perform well against the measurement criteria. This is specially the case in Regions 1, 2, 4, and 6, which are characterized by issues such as old and centralized infrastructure networks and high levels of population density. The study highlights the need to make improvements in terms of the robustness, redundancy, and flexibility of the critical infrastructure networks in the city.

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