196 research outputs found
Around the Grothendieck anabelian section conjecture
No full textThis is the author accepted manuscript. The final version is available from CUP via the DOI in this record We mostly survey recent results (including those of the author) on the Grothendieck anabelian section conjectur
On natural frequencies of Levy-type thick porous-cellular plates surrounded by piezoelectric layers
No full textIn this paper, an analytical solution for free vibration of rectangular porous-cellular plates enclosed by piezoelectric layers is presented by using third-order shear deformation plate theory. Using Hamilton’s principle and Maxwell equation, the governing equations of the system are obtained for both closed and open circuit conditions. Due to the coordinate dependency of mechanical properties of porous materials, the governing equations of motion are highly coupled. By using four auxiliary functions, these equations convert into two independent partial differential equations. The decoupled equations are solved analytically by employing Levy-type boundary conditions for the plate. Finally, after validation of the obtained results, the effects of various parameters such as porosity and geometrical dimensions on the natural frequencies of plate are investigated for different electrical and mechanical boundary conditions. It is found that the natural frequencies of the plate decrease as the coefficient of plate porosity increases. Also, the piezoelectric layers cause the natural frequency of the plate to increase in various vibrating modes
Implementasi Alat Monitoring Saidi Dan Saifi Via Sms Dan Iot
No full textReliability is the ability of the system to deliver electricity to customers in appropriate or reasonable standards and quantities. In this case, the author makes a tool for implementing SAIDI and SAIFI monitoring tools via SMS and IoT to help improve electrical reliability, if there is damage or problems in the electricity distribution system to customers in low-voltage electrical panels 380 V/220 V, it can be handled faster by PLN field officers with an SMS notification system and make it easier to retrieve SAIDI and SAIFI monthly/annual index data by using the SD card data recap storage system and on the Blynk application making it easier to evaluate, analyze and improve the reliability of the electric power system network in the future, especially at PT. Adra Brilliant Rayon of Bengkalis City. In data collection for 2 weeks from July 15 to 29 at PHBTR next
to GH Hangtuah Rumbia st, found 4 interruptions with an average interruption time of 72,865 minutes and a repair rate of 0.0137240102, the time difference between sending SMS messages and SD card data for 4 interruptions with an
average time of 151,175 minutes
ANALYSIS OF THE RELIABILITY OF THE 20 KV DISTRIBUTION SYSTEM AT ULP DHARMO PERMAI USING THE SAIDI AND SAIFI METHODS
No full textThe quality of electrical energy received by customers is influenced by the distribution system. It requires an electric power distribution system with good reliability. An electric power distribution system can be said to be reliable if the disturbances and blackouts that occur within a certain period of time are below the established reliability index numbers. The measure of the reliability of a system can be expressed by calculating the SAIFI (System Average Interruption Frequency Index) and SAIDI (System Average Interruption Duration Index), namely how often the system experiences blackouts and how long the outages occur within a certain time span, namely one year. This study aims to analyze the reliability of the electric power distribution system at PT. PLN ULP Dharmo Permai is based on the SAIDI and SAIFI reliability index by using distribution disruption data that occurred during 2019. The steps taken by the author are collecting disturbance data, blackout data, and customer data obtained at PT. PLN (Persero) ULP Dharmo Permai. Then the results of these calculations are compared with the values according to the SPLN 68-2: 1986 and IEEE std 1366-2003 standards. At the ULP Dharmo Permai the Saidi and Saifi values are very good because they do not exceed the limits specified by SPLN 68-2: 1986 and IEEE std 1366 - 2003
Natural frequencies of functionally graded plates with porosities via a simple four variable plate theory: an analytical approach
No full textIn this paper, the free vibration analysis of rectangular plates composed of functionally graded materials with porosities is investigated based on a simple first-order shear deformation plate theory. The network of pores in assumed to be empty or filled by low pressure air and the material properties of the plate varies through the thickness. Using Hamilton's principle and utilizing the variational method, the governing equations of motion of FG plates with porosities are derived. Considering two boundary layer functions, the governing equations of the system are rewritten and decoupled. Finally, two decoupled equations are solved analytically for Lévy-type boundary conditions so as to obtain the eigenfrequencies of the plate. The effects of porosity parameter, power law index, thickness-side ratio, aspect ratio, porosity distribution and boundary conditions on natural frequencies of the plate are investigated in detail
Perancangan Dan Pembuatan Alat Pendeteksi Durasi Pemadaman Untuk Menentukansystem Average Interruption Duration Index(Saidi)
No full textDistribution system as a system of distribution of electric power aredirectly related to Subscriber should pay attention to the level of its reliability of elektirik of its reliability of electric power supply ie. Konsumen continuously. This research aims to determine the indexto mainstay SAIDI. System average Interruptin Duration Index (average Time index of a blackout), based on the duration of the blackout, as well as the number of subscribers on each penyulang distribution network The methods used for data retrieval from the tools that have been created using the assumptions, this tool uses a microcontroller as the brain programs from design tool designed and function to calculate the duration of his long dead lights. Data to calculate the condition of dead and alive are stored on the sd card. To find out the many distractions and business clients the whole number of customers then the author uses the assumption, that assumption takes from line three pasha IE R S T, third line from the testing assumptions as much as two days per line. From the assumption that data has been collected data on overall customer and customer data that is experiencing interference.in the get custumer data with 310 custumer overall distruption of the average amount of long and 88.57 disturbace duration dead lights 2.95 hoursand has calculated the value of custumer outages saidi hours/week/0.1
Decoupling the nonlocal elasticity equations for three dimensional vibration analysis of nano-plates
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Exact solution for stability analysis of moderately thick functionally graded sector plates on elastic foundation
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