The study investigated the extent and organisation of guidance services in some secondary schools so as to assess the impact of guidance services on the lives of students. The main objective was to find out what the s...
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The study investigated the extent and organisation of guidance services in some secondary schools so as to assess the impact of guidance services on the lives of students. The main objective was to find out what the schools were doing to meet the educational, social and personal needs of the stuaents, and the means by which students could be better helped to understand themselves and plan for their future careers. Two main research questions were posed and answered. In addition, the following null hypotheses were stated and tested at 0.05 level of significance: 1. There is no significant difference between male and female students* needs for guidance services in the selected secondary schools. 2. There is no significant difference between students' ages and their needs for guidance servicer, 3. There is no significant difference between the mean scores of day and boarding students with respect of their needs for guidance services in secondary schools. ix The sample size of 308 respondents was randomly chosen out of which 296 were from Junior Secondary Three and Senior Secondary Two while 12 school counsellors were drawn from the six sample schools. The main instruments used for the study were the questionnaire and structured interview which were designed by the researcher. ANOVA and t-test statistical tools were used to analyse the data. Hypotheses 1 was retained while, hypotheses 2 and 3 were rejected. The study revealed the following: 1. That age has no significant effect on students' need for counsel-ling. That is to say both old and young need guidance services. 2. That guidance services have not yet made any appreciable impact in most of these schools under study. From the findings the following major recommendations were made: (a) That school administrations should provide some infrastructure, such as counsel-ling rooms adequate furniture and adequate funds to equip counsel-ling rooms. X (b) That the teaching load of the guidance masters should be greatly redu
The guidance hypothesis (Schmidt, 1991) predicts that the guiding properties of augmented feedback are beneficial for motor learning when used to reduce error, but detrimental when relied upon. Therefore, a heavily gu...
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The guidance hypothesis (Schmidt, 1991) predicts that the guiding properties of augmented feedback are beneficial for motor learning when used to reduce error, but detrimental when relied upon. Therefore, a heavily guiding form of feedback might be detrimental for learning. In addition, the guidance hypothesis predicts that practice with a high relative frequency of augmented feedback would be detrimental for learning. An experiment is described that crossed two forms of feedback with two levels of relative frequency. Subjects practiced movements to a target with either physical guidance or knowledge of results, and with either a high or faded relative frequency. The high frequency physical guidance condition resulted in the poorest retention, and both high frequency feedback conditions resulted in the least accuracy in transfer. These results provide support for the guidance hypothesis and suggest consideration of the combined effects on learning of the type and relative frequency of augmented feedback and acquisition-test conditions.
The guidance of a solar sail spacecraft from an Earth orbit to a point near the Sun-Earth L2 libration point is investigated in this paper. An open-loop trajectory is first computed by maximizing the rate of energy in...
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The guidance of a solar sail spacecraft from an Earth orbit to a point near the Sun-Earth L2 libration point is investigated in this paper. An open-loop trajectory is first computed by maximizing the rate of energy increase during the spiral segment and applying minimum-time optimal control for the remainder of the transfer. A follower guidance logic is employed in the spiral segment and a neighboring extremal feedback guidance is applied in the remaining transition segment.
The Specification for ground investigation (1993)(1) has been prepared and published as part of the Site Investigation Steering Group initiative for improved practice in site investigation, The development of the spec...
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The Specification for ground investigation (1993)(1) has been prepared and published as part of the Site Investigation Steering Group initiative for improved practice in site investigation, The development of the specification, based on earlier specifications by the Department of Transport (1987)(5) and the Institution of Civil Engineers (1989),(6) is described together with the philosophy adopted in its preparation, Problems with the previously existing specifications are noted, The format of the new document and the use of schedules to provide detailed information for a particular contract are described, The Paper describes the elements of the specification including the comprehensive notes for guidance and the bill of quantities, A formal method of measurement is not necessary but the option of including one to suit the Client's requirements is recognized, New and extended topics are summarized including the investigation of contaminated ground, Finally, users are invited to provide feedback and comment on the use of the specification, The contribution and support of the construction industry in its preparation is acknowledged.
The Health and Safety Executive is the main enforcing authority for health and safety legislation in industrial premises in Great Britain. Adequate standards of ionising radiation protection in such workplaces should ...
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The Health and Safety Executive is the main enforcing authority for health and safety legislation in industrial premises in Great Britain. Adequate standards of ionising radiation protection in such workplaces should be achieved by compliance with the Ionising Radiations Regulations 1985 and the associated Approved Code of Practice. The Health and Safety Executive has published guidance on safety in the design and use of gamma and electron irradiation facilities. A survey has been undertaken to assess current standards of radiation protection within a sample od industrial irradiation facilities in Great Britain. Compliance with the Regulations and the impact of the new guidance has been assessed. The findings of this survey are described and are being used to develop technical strategies for future inspection and enforcement of the Regulations in such facilities.
Machine vision and automatic guidance were added to a battery-powered lawn tractor. Row-following algorithms and the results of extensive laboratory and field testing are reported. The systems steering performance was...
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Machine vision and automatic guidance were added to a battery-powered lawn tractor. Row-following algorithms and the results of extensive laboratory and field testing are reported. The systems steering performance was comparable to steering by human operators. The vision-guided vehicle followed rows of young corn plants accurately (within 50 mm or 2 in.) at 0.6, 1.8, and 4.0 km/h (0.4, 1.1, and 2.5 mph).
We developed a stainless steel spring hookwire, 0.28 mm in diameter and 10 mm in length, with a 30-cm-long, 5-0 nylon monofilament suture firmly attached to its funnel-shaped end. A 21-gauge, 10-cm-long cannula was us...
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We developed a stainless steel spring hookwire, 0.28 mm in diameter and 10 mm in length, with a 30-cm-long, 5-0 nylon monofilament suture firmly attached to its funnel-shaped end. A 21-gauge, 10-cm-long cannula was used as an introducer, and a 24-gauge, 10-cm-long blunt-pointed needle as a pusher. The hookwire was successfully placed into the target pulmonary parenchyma under computed tomography guidance in two patients with a small pulmonary nodule. The attached string served as a clear guide at thoracoscopy. Flexibility of the exposed suture through the skin eased wire management after placement. No wire dislodgement occurred.
In recent years, parallel distributed processing has provided a new paradigm for algorithms, such as in missile guidance, which requires a high degree of computational efficiency as well as reliability and smaller siz...
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ISBN:
(纸本)0819418196
In recent years, parallel distributed processing has provided a new paradigm for algorithms, such as in missile guidance, which requires a high degree of computational efficiency as well as reliability and smaller size hardware. A problem of particular interest to the guidance literature is the closed-loop optical solutions that can be achieved on-board the missile. Furthermore, a desirable guidance scheme should be robust to low signal-to-noise conditions that generally arise in long-range applications. In this paper we shall present a neural network- based guidance scheme which provides a real-time optimal control on-board the missile with the inclusion of noise in the LOS angular rate data. The neural network is trained in an off-line session using optimal solutions obtained from an optimal control software resulting in a real- time closed-loop guidance method. The performance of the proposed scheme is then evaluated for different levels of SNR of the Line-Of-Sight (LOS) angular rate in a tail-chase engagement. In doing so, similar tests were conducted for the currently used closed-loop proportional navigation method and the potentially available technique of iterative optimal open-loop control with and without the presence of noise in the LOS angular rate. Although we did not include the noise in the missile/target dynamical model, the results indicate that the neural network-based scheme shows more robustness to low signal-to-noise situations as compared with traditional proportional navigation methods. This superiority is due, among other things, to the elimination of some of the restrictive, and in many cases unrealistic assumptions made in the derivation of most current guidance laws in use such as, for instance, unbounded control, simplified dynamics and/or aerodynamics, and non-maneuvering targets, to name a few.
The use of lasers by the academic community continues to dramatically escalate. Academia is inundated with a profusion of lasers, each with a diverse function. Traditional departments such as biology, chemistry, and p...
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ISBN:
(纸本)0819418846
The use of lasers by the academic community continues to dramatically escalate. Academia is inundated with a profusion of lasers, each with a diverse function. Traditional departments such as biology, chemistry, and physics have introduced the use of lasers as an essential element of tutelage. Even the more distinctive departments such as Cancer Research, Civil Engineering, Earth and Planetary Science, Plasma Fusion, Spectroscopy, and so forth, have incorporated the laser in the composition of their educational mechanism. The literature indicates most ocular accidents happen during alignment procedures, which is an everyday activity for educational laboratories. Also, the improper use of laser safety eye wear is a major area of concern for laser safety in education institutions. More Class II, III, and IV lasers are used in universities, colleges, laser electro-optic technical colleges and high schools than probably any other area: for teaching, research, laboratory experiments, and demonstrations. Relatively large numbers of students work in laboratory groups in confined area, with various lasers of different wavelengths in the same laboratory. Open cavity and beam paths of Class IV lasers are common in these environments. Most educational institutions do not have laser safety officers or standard operation procedures. This paper will discuss the development of a new laser safety standard by an ANSI ad-hoc committee and by the executive committee of the ANSI Z-136 intended to provide adequate, reasonable, and practical guidance for educators, students, and spectators found in classrooms, lecture halls, and laboratories associated with universities, colleges, high, and elementary schools.
In this work, the following problem is considered. A rigid body is moving immersed in a fluid of infinite depth. Its goal is to hit another body which floats on the surface of the fluid. Using stochastic control metho...
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In this work, the following problem is considered. A rigid body is moving immersed in a fluid of infinite depth. Its goal is to hit another body which floats on the surface of the fluid. Using stochastic control methods, a sequence of subproblems concerning the guidance and control of the immersed rigid body are dealt with.
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