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Experimental analysis of ACP on photovoltaics as free convection for increasing output power

Sofijan Armin, Suprapto Bhakti Yudho, Nawawi Zainuddin

Przegląd Elektrotechniczny

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2022

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R. 98, nr 5

121--125

EN

This experiment uses perforated ACP as a cooling medium mounted on the back of a 100 Wp polycrystalline type photovoltaic panel, ACP with a hole diameter of 10 mm as passive cooling, which functions to reduce the temperature of the photovoltaic panel which has increased due to an increase in temperature. Radiation and excess heat from the Sun from 09.00 am to 15.00 pm, which is the peak of solar heat in subtropical areas such as Indonesia. The decrease in the temperature of the PV panels installed using the ACP cooler with a maximum of 9.13C due to the free convection process will cause an increase in the maximum output power of the PV panel of 11.15 W.

PL

W tym eksperymencie zastosowano perforowany ACP jako czynnik chłodzący zamontowany z tyłu panelu fotowoltaicznego typu polikrystalicznego o mocy 100 Wp, ACP o średnicy otworu 10 mm jako chłodzenie pasywne, którego zadaniem jest obniżenie temperatury panelu fotowoltaicznego, która wzrosła ze względu na wzrost temperatury. Promieniowanie i nadmiar ciepła ze Słońca od 09:00 do 15:00, co jest szczytem ciepła słonecznego w obszarach podzwrotnikowych, takich jak Indonezja. Spadek temperatury paneli fotowoltaicznych zainstalowanych przy użyciu chłodnicy ACP o maksymalnie 9,13C w wyniku procesu konwekcji swobodnej spowoduje wzrost maksymalnej mocy wyjściowej panelu fotowoltaicznego o 11,15 W.

2

Residual life estimation of healthy and cracked composite beam using experimental and numerical modal analysis methods

Ramprasad Gedela, Ramakrishna Shinigam

Journal of Mechanical and Energy Engineering

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2020

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Vol. 4, No 2

127--134

EN

Preventive maintenance is beneficial to minimize unexpected breakdowns in industries with continuous production. Composite structures are used for naval applications like ship hulls and marine propellers. In most of the industries, composite structural health analysis using experimental and numerical model are available for damage detection and estimate the residual life of composite beams. The present work is focusses on identification of damage and estimate residual life of composite healthy and cracked beams. Free vibrational analysis is carried out on composite beam made of Glass fiber reinforced polymer (GFRP) with a different crack orientation. A Fast Fourier Transform (FFT) spectrum analyzer associated with engineering data management (EDM) software utilized for experimental analysis to detect presence of damage in cracked composite beam. Finite element method (FEM) software called Analysis of composite pre/post (ACP) available in ANSYS R3 is used to compare the natural frequency results of healthy composite beam with cracked composite beam with different ply orientations. For validation of numerical modal evaluation, the consequences acquired from ANSYS R3 Finite element analysis (FEA) software are in comparison with experimental results received by impact hammer method. The fatigue life of a damaged composite beam is estimated the use of “Hwang and Han’s” fatigue life equation.

3

Ranking of Sudden Ionospheric Disturbances by Means of the Duration of Vlf Perturbed Signal in Agreement with Satellite X-Ray Flux Classification

Ammar A., Ghalila H.

Acta Geophysica

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2016

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Vol. 64, no. 6

2794--2809

EN

Ionosphere undergoes permanently solar flares that quickly change its properties inducing sometime unwanted effects. These changes, or events, are known as Sudden Ionospheric Disturbances (SIDs) and the knowledge of their magnitude may be of great interest to anticipate probable damages. Currently, there does not exist any classification of these ionospheric changes based on their amplitude due to the wide variability of its responses. The only way to surmise their importance is to study them indirectly, throughout the classification of the X-ray flux intensity recorded by satellites. An attempt of classification based on their duration was proposed by the American Association of Variable Star Observers (AAVSO) but it is not very accurate because SID’s duration is measured directly from the raw signal of the Very Low Frequency (VLF) signal and/or the Low Frequency (LF) signal. The aim of this work is to investigate, through a set of simple mathematical techniques applied to VLF/LF signals recorded by ground based receivers, the best method to estimate SIDs durations and then propose a new classification based on these durations.

4

Komunikacja ze sprzętowym akceleratorem haszowania n-gramów dla procesora ARM z wykorzystaniem portu ACP

Barszczowski M., Koryciak S., Dąbrowska-Boruch A., Wiatr K.

Pomiary Automatyka Kontrola

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2014

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R. 60, nr 7

486--488

PL

Artykuł opisuje uruchomienie portu ACP w układzie EPP firmy Xilinx przy użyciu CDMA zarządzającego transmisją pomiędzy akceleratorem, a rdzeniami procesora. Głównym celem badań było utworzenie modułu dokonującego tak zwanego haszowania zbiorów danych. Do wykonania tej operacji wykorzystany został układ Zynq 7000 posiadający zasoby logiki programowalnej oraz dwa rdzenie ARM A9. Powstały dwie koncepcje realizacji akceleratora. Pierwsza wersja zakładała bezpośredni przepływ danych ze źródła do akceleratora, a następnie do rdzeni ARM. Drugie rozwiązanie zakłada wykorzystanie portu ACP.

EN

This paper introduces a new approach to hardware acceleration using the ACP(Acceleration Coherency Port) in Xilinx Zynq-7000 EPP XC7Z020. The first prototype allocated BRAM memory and transferred data through the ACP. The second one used a hardware hashing module to process data outside the CPU. The module received and returned data through the ACP port. The main task of the system is to replace a set of data with its shorter representative of constant length without interference of the processing unit. The main benefit of hashing data lies within the constant length of function outcome, which leads to data compression. Compression is highly desirable while comparing large subsets of data, especially in data mining. The execution of a hashing function requires high performance of the CPU due to the computational complexity of the algorithm. Two concepts where established. The first one assumed transferring data directly do the hardware accelerator and later to ARM cores. This solution is attractive due to its simplicity and relatively fast. Unfortunately, the data cannot be processed before hashing with the same CPU without significant speed reduction. The second approach used the ACP port which can transfer data very fast between L2/L3 cache memory without flushing of validating cache. The data can be processed by the software driven CPU, sent to the accelerator and then sent back to CPU for further processing. To accomplish the established task, the Zynq 7000 EPP with double ARM A9 core and programmable logic in one chip was used.

5

PSF - A Retrospective

Veltin G.J.

Fundamenta Informaticae

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2010

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Vol. 100, nr 1/4

181-227

EN

Modern day computer architectures offer ever-increasing support for parallel processing, still it turns out to be quite difficult for programmers and therefore programs to tap into these parallel resources. To benefit from real general-purpose parallel computing we claim that it is likely that a paradigm shift is needed in the way we think about programming. This change of thought in turn will need to be reflected in future programming languages as well. We think that the field of process algebra provides thorough insight in how to reason about the construction of software for concurrent systems and will be one of the enabling technologies supporting this transition. The wish to connect process algebra, a mathematical theory, to the world of computer-readable and executable specifications led to the development of PSF (Process Specification Formalism). PSF is an implementation of the process algebra ACP (Algebra of Communicating Processes) integrating ASF (Algebraic Specification Formalism) to specify algebraic data types. One of the first publications on PSF appeared in Fundamenta Informaticae in 1990. Here we stated as the first sentence of the abstract: "Traditional methods for programming sequential machines are inadequate for specifying parallel systems". Unfortunately, though some advancements have been made since 1990, we can still uphold this statement 20 years later. This current report documents the developments that lead to the construction of PSF and the 1990 publication and moreover it also documents how PSF and its tools have evolved since 1990 taking the conclusion and the outlook for future work from the original article as a reference point. Using the knowledge gained both in constructing tools for PSF and in using PSF to specify concurrent systems, we will judge, discuss and criticise the design decisions taken and show paths for future developments.