Analytical and finite-element study of optimal strain distribution in various beam shapes for energy harvesting applications

Due to the increasing demand for harvesting energy from environmental vibration, for use in self-powered electronic applications, cantilever-based vibration energy harvesting has attracted great interest from various parties and become one of the most common approaches to convert redundant mechanical energy into electrical energy. As the output voltage produces from a piezoelectric material depends greatly on the geometric shape and the size of the beam, there is a need to model and compare the performance of cantilever beams of differing geometries. This paper presents the study of strain distribution in various shapes of cantilever beams, including a convex and concave edge profile elliptical beams that have been overseen in most of the prior literature. Both analytical and finite element models are derived and the resultant strain distributions in the beam are computed based on MATLAB solver and ANSYS finite element analysis tools. An optimum geometry for a vibration-based energy harvester system is verified. Lastly, experimental results comparing the power density for a triangular and rectangular piezoelectric beams are also presented to validate the finding of the study and the claim as suggested in the literature is verified

Intelligent agent for formal modelling of temporal multi-agent systems

Software systems are becoming complex and dynamic with the passage of time, and to provide better fault tolerance and resource management they need to have the ability of self-adaptation. Multi-agent systems paradigm is an active area of research for modeling real-time systems. In this research, we have proposed a new agent named SA-ARTIS-agent, which is designed to work in hard real-time temporal constraints with the ability of self-adaptation. This agent can be used for the formal modeling of any self-adaptive real-time multi-agent system. Our agent integrates the MAPE-K feedback loop with ARTIS agent for the provision of self-adaptation. For an unambiguous description, we formally specify our SA-ARTIS-agent using Time-Communicating Object-Z (TCOZ) language. The objective of this research is to provide an intelligent agent with self-adaptive abilities for the execution of tasks with temporal constraints. Previous works in this domain have used Z language which is not expressive to model the distributed communication process of agents. The novelty of our work is that we specified the non-terminating behavior of agents using active class concept of TCOZ and expressed the distributed communication among agents. For communication between active entities, channel communication mechanism of TCOZ is utilized. We demonstrate the effectiveness of the proposed agent using a real-time case study of traffic monitoring system

Pemikiran Politik Islam Muhammad ‘Abid Al-jabiri: Telaah Terhadap Buku Al-‘aql Al-siyâsi Al-‘arabî: Muhaddidâtuh Wa Tajalliyâtuh

: Muhammad‘Abid al-Jabiri's Islamic Political Thought: A Study of his al-‘Aql al-Siyâsi al-‘Arabî: Muhaddidâtuh wa Tajalliyâtuh.The political system in theArab modern world generally perceived as authoritarian and despotic attracted al-Jabiri to examine the root of the problem. He has conducted a sharp review and then find the root of the problem. According to him there are three fundamental elements in political reasoning subconscious Arab society that affect the reality of the political system of the Arab world who tend not democratic today, the reasonof qabîlah, ghanîmah, and ‘aqîdah. Qabîlahwas a logical representation of political and sectarian nepotistic, ghanîmah is a manifestation of the country's financial system that is not healthy, while ‘aqîdah is a representation of understanding or doctrinaire political ideologies. To overcome this, such the three basic proficiency level mindset needs to be changed, the mindset qabîlah who was nepotistic and ethnocentric converted into an egalitarian party system and professional; reason ghanîmah converted into productive systems and sustainable fiscal; and ‘aqîdahreason converted into a mindset that is rational and objective

Errors Made by the Presenters of Thesis Proposal Seminar in English Study Program

This study is aimed to find out the types of errors made by the presenters of thesis proposal seminar based on Communicative Effect Taxonomy and to find out whether or not global errors of Communicative Effect Taxonomy made by the presenters of thesis proposal seminar significantly hinder communication between the presenters and the audiences. This study used qualitative approach since the data of this study was taken from 4 students\u27 presentations which were in the form of words rather than number and statistic. This study revealed that there were 188 errors committed by the students in which 179 and 9 erroneous utterances fall under local error and global error respectively. The local errors consist of 45 lexical errors, 93 morphological errors, and 41 syntactical errors. The global errors consist of 2 wrong order of major constituents, 1 missing, wrong, or misplaced sentence connectors, 1 missing, wrong, or misplaced sentence connectors, and 5 uncategorized global errors. As for the effect of global error to the audience, the writer found out that the global errors did not significantly hinder communication to the audience

Errors Made By The Presenters Of Thesis Proposal Seminar In Study Program Of English Universitas Brawijaya

Keywords: Error, Error Analysis, thesis proposal seminar, Communicative EffectTaxonomy, global errors, local errors, eighth semester students.One of the most important languages to learn today is English since it is widely spoken around the world. In learning another language including English, a learner sometimes produces errors and Error Analysis (EA) has a methodology to figure them out. One of the methodologies is Communicative Effect Taxonomy. In this study, the writer analyzed errors made by the presenters of thesis proposal seminar in Study Program of English Universitas Brawijaya based on Communicative Effect Taxonomy. Furthermore, the writer proposed two objectives of the study, (1) To find out the types of errors made by the presenters of thesis proposal seminar based on Communicative Effect Taxonomy; (2) To find out whether or not global errors of Communicative Effect Taxonomy made by the presenters of thesis proposal seminar significantly hinder communication between the presenters and the audiences.This study used qualitative approach because the data of this study was taken from 4 students\u27 presentations which were in the form of words rather than number and statistic. The researcher analyzed the data by using the theory of Communicative Effect Taxonomy.This study revealed that there were 188 errors committed by the students in which 179 and 9 erroneous utterances fall under local error and global error respectively. The local errors consist of 45 lexical errors, 93 morphological errors, and 41 syntactical errors. The global errors consist of 2 wrong order of major constituents, 1 missing, wrong, or misplaced sentence connectors, 1 missing, wrong, or misplaced sentence connectors, and 5 uncategorized global errors. As for the effect of global error to the audience, the writer found out that the global errors did not significantly hinder communication to the audience.The writer suggests the next researchers who want to conduct similar research to use another subject or another theory. Another suggestion is to use the similar theory but with different object

Angular dependence of domain wall resistivity in artificial magnetic domain structures

We exploit the ability to precisely control the magnetic domain structure of perpendicularly magnetized Pt/Co/Pt trilayers to fabricate artificial domain wall arrays and study their transport properties. The scaling behaviour of this model system confirms the intrinsic domain wall origin of the magnetoresistance, and systematic studies using domains patterned at various angles to the current flow are excellently described by an angular-dependent resistivity tensor containing perpendicular and parallel domain wall resistivities. We find that the latter are fully consistent with Levy-Zhang theory, which allows us to estimate the ratio of minority to majority spin carrier resistivities, rho-down/rho-up~5.5, in good agreement with thin film band structure calculations.Comment: 14 pages, 3 figure