eBooks „Reliability“
Es wurden 12 eBooks für den Suchbegriff „Reliability“ gefunden.
Dr.D.Ponmozhi -, - -
Conflct Management Style
Conflict
- Bildung
- Englisch
- 473 Wörter
- Ab 18 Jahren
- 1
- 1
Throughout the centuries, conflict has been observed as, a major problem in educationa organizations. With the coming of the 21st century, conflict became one of the most important tools in the development of organizations when it is carefully managed. The purpose of this study was to investigate conflict management styles in secondary schools and their effects on teacher performance. It also sought to identify constructive methods of managing conflicts amongst teachers. The researcher used descriptive survey and was carried out in Bomet District. The target population was 77 schools in the district. Purposive sampling was used to select the best seven performing schools and the seven poor performing schools in the district. Stratified sampling was used to select five teachers from the following five departments namely; Languages, Sciences, humanities, Technical and Creative Arts and Guidance and Counseling. Purposive sampling was employed to pick the headteacher for each selected school. Headteacher Conflict Management questionnaire, Teacher Conflict Management and semi-structural interview schedule were used to collect data. The instruments were piloted using a sample of two best performing schools and two poor performing schools in the district to pre-test them. Headteacher and Teacher Conflict Management Questionnaires were served to the headteachers and teachers respectively to elicit their opinions on conflict management styles and their effects on teacher performance. Semi-structured interview schedule were applied to ten 1306 chairpersons chosen randomly from the selected schools. The researcher used test-retest technique to determine the reliability of the instrument. A persons product moment formula for the test-retest was employed to compute the correlation coefficient. A correlation coefficient of about 0.8 was considered high enough to judge the instrument as reliable for study. The study used content validity to measure the relevance of the research instruments. Data collected was coded and analyzed manually using qualitative analysis. The study identified five conflict management styles used in secondary school. It found out that cooperative problem solving was the most effective conflict management style in secondary schools in Bomet District. Finally, the researcher recommends that further research be clone to investigate conflict management styles and their effect on teacher performance in other schools within the District. A comparative study could also be carried out between schools from another district and from Bomet District. [mehr]
Stichwörter: conflict
Kostenlos
Dr. Hedaya Alasooly
Introduction to Power System Protection
- Technik
- Englisch
- 25100 Wörter
- Keine Altersempfehlung
- 90
Power system protection systems have three basic components: Instrument transformers, Relays, Circuit breakers
The function of the CT is to reproduce in its secondary winding a current I’ that is proportional to the primary current I. The CT converts primary currents in the kiloamp range to secondary currents in the 0–5 ampere range for convenience of measurement.
The function of the relay is to discriminate between normal operation and fault conditions. The OC relay in Figure 2 has an operating coil, which is connected to the CT secondary winding, and a set of contacts. When |I’| exceeds a specified ‘‘pickup’’ value, the operating coil causes the normally open contacts to close. When the relay contacts close, the trip coil of the circuit breaker is energized, which then causes the circuit breaker to open.
System-protection components have the following design criteria:
Reliability: Operate dependably when fault conditions occur, even after remaining idle for months or years. Failure to do so may result in costly damages.
Selectivity: Avoid unnecessary, false trips.
Speed: Operate rapidly to minimize fault duration and equipment damage. Any intentional time delays should be precise.
Economy: Provide maximum protection at minimum cost.
Simplicity: Minimize protection equipment and circuitry.
Since it is impossible to satisfy all these criteria simultaneously, compromises must be made in system protection.
The book consists from the following sections:
Chapter 1: Power System Faults:
Chapter 2: Instrument Transformers.
Chapter 3: Overcurrent and Earth Fault Protection Relays.
Chapter 4: Radial System Protection.
Chapter 5: Zones of Protection.
Chapter 6: Differential Relays.
Chapter 7: Distance Relays.
Chapter 8: Transformer Protection.
Chapter 9: Generator Protection.
Chapter 10: Busbar Protection.
Chapter 11: Circuit Breakers.
Chapter 12: Fuses.
Chapter 13: References. [mehr]
Stichwörter: Power System Protection, Switchgear, Power System Faults, Instrument Transformers, Overcurrent Relay, Earth Fault Relay, Radial System Protection, Zones of Protection, Differential Relay, Transformer Protection, Generator Protection, Busbar Protection, Circuit Breaker, Fuse, Current Transformer, Voltage Transformer
5,99 US$
- Prev
- Next