Sensitivity analysis for dam breach parameters using different approaches for earth-fill dam

The prediction of dams breach geometry crucial in studies of dam breaking. The hydrographs characteristics of flood that resulting from breaking of dam is mainly depend on the geometry of breach and the time formation of breach. Five approaches (Froehlich, Macdonald and Langridge-Monopolis, Von thun & Gillete, USBR and Singh % Snorrason) was used in order to predict dam breach parameters (breach width, breach side slope, breach formation time). The Sensitivity analysis was performed in order to assess the effect of each parameter on the resulting hydrograph of the flood. HEC-RAS model was used to calculate the effect of each parameter on the hydrograph of the flood that resulted. The width of breach (Bavg), side slope (z) and formation time of breach (tf) increased by 25%, 50%, 75% and 100% and decreased by 25%, 50% and 75%, respectively. Flood hydrograph was estimated at the dam site for each case. Sensitivity analysis was performed in order to check the effect of each parameter of breach and time of breaching. Sensitivity analysis was performed with Froehlich method with the mode of overtopping failure and maximum operating level at 107.5 meter above sea level. Result of sensitivity analysis show that peak discharge and time to reach it is adequately sensitive to breach side slope, highly sensitive to the breach formation time and less sensitive to breach width.

The Evaluation of Failure Structure Condition with Plaxis Program on the Poso I Hydropower Barrage

The Poso I Hydropower Station is located on the Poso River, at the downstream section of the Poso Lake in Central Sulawesi Province. At the weir site, the catchment area is 1906.30 km2, and the structures are designed for a 50 year return period. Flood discharge is 1456.50 m3/s, with the mean annual release being 127.85 m3/s. The total supply water level is 510.50m, and the minimum operating level is 506.00 m. The model uses an undistorted model with a scale of 1 to 60. The barrage needs to be reviewed for failure factors that are likely to occur similar to those used in potential failures in the construction of dams in general. The study was considered in three conditions: empty barrage condition, average level, and flood level. With the piping calculation method, the barrage used Lane and Bligh method. While the calculation of barrage sliding stability used Finite Element Method with Plaxis 2D program simulation got the safety factor at the empty condition and flood level. It is caused by water pressure at flood level conditions that influence barrage stability. Safety factor value exceeded permits made. The Poso I Hydropower Station was safe.

The Development of Cooperation Model for Protection and Care for Students under the Office of the Thailand Basic Education Commission

This paper reports the development of cooperation model for protection and care for students under The Thailand Office of the Basic Education Commission (OBEC). Consistent of 4 parts as follows: 1) background, concepts and the objectives of the model 2) model's components in three levels as the policy, the driven forced, and operating level 3) guidelines for using this model and 4) conditions for success. Experts have the overall opinion that the model is accurate, appropriate, feasible and useful

Rancang Bangun Adjustable Power Supply dengan Overload Current Protection Berbasis IC LM723

The type of power supply that is commonly used is the adjustable power supply. Its ability to generate a varying voltage level, making it suitable for testing a wide variety of electronic circuits. A conventional protection system of this type is usually a fuse, overcurrent event occurred due to improper installation of the components and circuit design will make this protection system is active and needed replacement fuse. To eliminate the need for fuse purchases at the Instrumentation and Electronics Engineering Laboratory, Undip Vocational School, an adjustable power supply was built with an overload current protection based on the LM723 IC for an operating level of 1 ampere. The system was built as non-fuse protection current limiter. This study will describe the stages of the manufacturing and testing system. The test results show that the power supply output is linear with the coefficient of determination = 0.99 and correlation = 0.99. The system can also limit the average maximum working current of 0.95 for several variations of load resistance.

PECULIARITIES OF PRODUCTION AND TECHNICAL PRODUCTION AND TECHNICAL EXPLOITATION OF THE USE OF TECHNOLOGY IN THE AGROTECHSERVICE ENTERPRISE

The purpose of the article is to improve the production and technical exploitation of the machine-tractor fleet and the efficient use of machinery in the service area with the use of application of resuscitation techniques. The methodology and methods used are the theoretical and methodological basis of the research work of our country and foreign scientists on the technical maintenance of agricultural production, the organization and effective functioning of the institutions implementing it. Here a number of methods of analysis of mass service theory and graph theory are used. The main scientific novelty of the results is the use of integrated indicators to mechanize technological processes in the context of existing structural features of agricultural production, to increase the operating level of the machine-tractor fleet. The production and technical exploitation depends on the level of technical maintenance of the process. The results of the research are joint review of “production and technical exploitation” and resuscitation techniques in ensuring the mechanization of technological processes in the context of existing structural features of agricultural production; the use of a comprehensive indicator for assessing the operational level of the machine-tractor fleet; development of the model of production and technical exploitation of the fleet based on four groups that characterize the usefulness of organizational, technical and technological measures, as well as methods of increasing the level of technical service of various economic entities to ensure the quality of the machine-tractor fleet operation: – Existing forms of technical and technological classification of mechanization of production processes in agriculture and increasing the intensity of use of machines in established engineering service facilities; – Improvement of production and technical exploitation of machine-tractor fleet of service enterprises operating in economic climatic conditions and improvement of use of machines with application of resuscitation techniques; – Ensure that labor costs and maintenance and repair in the manufacturing process are lower than the cost of 15 manat per conventional ha etalon; – Ensure the performance of the whole complex of mechanized work with the effective use of the machine-tractor fleet.

OPERASIONALISASI SPEKTRUM DISEMINASI MULTI CHANNEL TEKNOLOGI PERTANIAN UNTUK DISEMINASI YANG EFEKTIF

<p>Downstreaming information of Indonesian Agency for Agricultural Research and Technology (IAARD) technology is carried out, among others, through the Multi Channel Dissemination Spectrum (MCDS). The SDMC employs various dissemination channels and actors to accelerate technology dissemination. MCDS discussions at the operating level are limited especially on how it contributes to more technology adoption. Referring to the Agricultural Innovation System, an innovation arises due to support of various subsystems ranging from technology providers, carriers, users, markets, policies, and interactions among subsystems. Likewise, the MCDS should be supported by its subsystems for an effective dissemination. This paper aims to contribute ideas on subsystems requirements in the implementation of the MCDS and how these subsystems can drive the delivered technology information to be adopted by users. The supporting subsystems (planning, approaches in the implementation process, policies, infrastructure) for technology implementation are essential in dissemination activities. As a system, MCDS does not only focus on delivering IAARD’s technology information, but the success of technological innovation must be supported by dissemination planning and its subsystems, technology application ecosystem, and interaction between potential users and technology producers.</p>

Optimization Approach of Ventilation Systems in Heating, Ventilation, and Air Conditioning for an Underground Building’s Transport

This investigated research work and the final decisions were arrived from the specific dynamical analysis of three different new and innovate underground interchange buildings planned and executing currently at Doha and Al khor situated at Qatar is presented. A supplementary study was carried out for an identical two-tier swapping building technique and the approach and outcome have been reported in this research article. The examination of dissimilar ventilation and air-conditioning stratagems has been done initially. The prime objective is to find the efficient and effectual design to invent and so as to uphold to get an attention of pollutant contaminant and thermal temperatures under the modelled and designed values, by investing very low cost even in the operating level. The systematic CFD modelling of dissimilar stratagems was done and the numerical and simulated results are shown in this work. The same has again merged with a dynamical Computational Fluid Dynamics (CFD) coding to reach the optimum result. This was done with the coordination with buses circulation and with the sources of heat and disbursed pollution. The concluding optimal result succeeded is grounded on a substantial partitioning which is connecting between the island area and berth locale. The efficacy of the multifarious design strategies and probable predictions are presented in the conclusions. In order to manage a fire crisis situation, it is primary to check about the planning of the fire and flames struggling measures which comprises of automatic freshening like ventilation along with arrangements of curtains, and explain the smoke sectors which would be able to manage with a fire crisis condition. The main results accessible are temperature fields, concentration of smoke and visibility.

Governance mechanism alignment at the top and operating levels of alliance hierarchy: reconciling two competing schools of thought

Purpose This paper aims to examine alliance governance at different hierarchical levels. Design/methodology/approach The data is collected from both top-level and operating-level managers in 286 strategic alliances in China (a total of 572 managers). Hierarchical moderated regression models are adopted to test the hypotheses and two-stage regression analyzes are used to correct for endogeneity. Findings This paper finds that relational governance has a greater impact on alliance performance than contract utilization at the top level. Furthermore, the simultaneous use of relational governance at the top and operating levels have a detrimental impact on alliance performance. Finally, top-level contract utilization has a negative interaction with operating-level relational governance but a positive interaction with operating-level contract utilization. Research limitations/implication First, the cross-sectional nature of the data collection approach provides only a snapshot of how each type of governance mechanism and its interactions affect alliance performance. Second, the sample is limited to firms located in emerging markets. Practical implications Managers should realize that the effectiveness of contract and relational governance mechanisms varies across different management levels and they should be cautious about the cross-level governance mechanism alignment. Originality/value This study advances the interfirm governance literature in that this paper examined alliance governance at different hierarchical levels and provides new insights into the ongoing debate on whether the contract and relational governance mechanisms function as complements or substitutes by exploring the governance alignment across different alliance hierarchies.

Structural Cooperation Between Teachers, Public Librarians and Teacher Librarians

According to the concept of ‘Public Library at School’, secondary schools and public libraries in the Netherlands are working on a structural cooperation. They collaborate at strategic, tactical and operating level to improve language skills, reading motivation and information literacy of students. This paper describes the experiences of the collaboration between several pre-vocational secondary schools and public libraries during the period of 2012 – 2015. Especially, the force of the collaboration of all the parties involved, is shown at all the components of the concept ‘Public library at school’. In all the example-schools it is shown that collaboration pays off. There are results on the management, employee and student level. The most important improvements are: students read more, students visit the (school) library more often, reading is more and more seen as ‘a normal thing to do’ and reading attitudes of students are improved.