Sebelas Maret University

About: Sebelas Maret University is a education organization based out in Surakarta, Indonesia. It is known for research contribution in the topics: Population & Public health. The organization has 10901 authors who have published 10832 publications receiving 33057 citations. The organization is also known as: Universitas Negeri Surakarta & Universitas Sebelas Maret.

Nanoparticles as components of electrochemical sensing platforms for the detection of petroleum pollutants: A review

Abstract: Accurate monitoring of environmental pollutants has become a primary concern due to rapid progress in the oil industry during recent years. Nanoparticles (NPs) for electrochemical sensing are emerging as crucial tools for pollutant monitoring such as aromatics hydrocarbon, polyphenols, and toxic gases produced by the oil industry. NPs provided increasing the sensitivity and selectivity of the sensor through increasing the surface area, owing to the high surface-to-volume ratios, and a highly active site area so that the molecules could be easily adsorbed on the surface electrode to undergo a redox reaction. This paper presents a comprehensive overview of the latest nanoparticles used for electrochemical sensing. Moreover, some parameters such as sensitivity, selectivity, the limit of detection, including a specific mechanism detection of analyte targets, and response time have been discussed to determine optimum condition for polyphenols, aromatic compounds, and toxic gases detection. Some recent results have been presented and discussed.

Pengaruh corporate governance terhadap tax avoidance

Abstract: This study aims to find oat how the influence of the corporate governance of tan: avoidance activity in companies listed on Indonesia Stock Exchange in 2003. fire samples are publicy traded company iisted on the Indonesia Stock Exchange in 2006‘ as many as 200 companies. Tiiis staajz ases data anatfysis and regression anabisis oftize eiements of corporate governance and tax avoidance. The resaits of this stttdv sizovv that the eiements of corporate governance that consist of aadit aaaiity and aadit committee signy’t'cantt'y inflaence the activity oftar avoidance as measared asing proxy book tax gap. Other resaits show that the tax avoidance activity as measared vvitit proxy book tar gap are not aflected significantiy by institationai o1vnei'.sittp and board of comntissioners. Limitation oftnis staajt is not to ase eaciz ijrpe of indastries as contra! variaoie so can 't identyfv the direct ejfect from type of indastty on tax avoidance. Another iimitation of'tia's stttojz is ase corporate governance ’s proigv separateiy_ so it can't captare tire flair’ effect of corporate governance. Keywords.‘ corporate governance, ownersnio stractare, ooard ofcon-tmissioners. aadit committee, tax avoidance, oook tar gap.

Material Characterization of a Magnetorheological Fluid Subjected to Long-Term Operation in Damper.

Abstract: This paper investigates the field-dependent rheological properties of magnetorheological (MR) fluid used to fill in MR dampers after long-term cyclic operation. For testing purposes, a meandering MR valve was customized to create a double-ended MR damper in which MR fluid flowed inside the valve due to the magnetic flux density. The test was conducted for 170,000 cycles using a fatigue dynamic testing machine which has 20 mm of stroke length and 0.4 Hz of frequency. Firstly, the damping force was investigated as the number of operating cycles increased. Secondly, the change in viscosity of the MR fluid was identified as in-use thickening (IUT). Finally, the morphological observation of MR particles was undertaken before and after the long-term operation. From these tests, it was demonstrated that the damping force increased as the number of operating cycles increases, both when the damper is turn on (on-state) and off (off-state). It is also observed that the particle size and shape changed due to the long operation, showing irregular particles.

The Interest Prohibition and Financial Performance of Islamic Banks: Indonesian Evidence

Abstract: In the beginning 2004, Majelis Ulama Indonesia (Indonesia Ulema Council) released fatwa that definitely mentioned the proscribing of interest. In the period after fatwa, the main indicators of Islamic banks indicated a significant growth. Thus, the objective of this study is to investigate whether the financial performance of Islamic banks in the period before fatwa is different from that in the period after fatwa. Furthermore, this study intends to examine the comparative financial performance of Islamic banks and conventional banks in the period both before fatwa and after fatwa. In evaluating banks’ performance, this study used various financial ratios categorized as profitability, liquidity, risk and solvency, and efficiency. To determine the difference, this study used t-test. The result of this study indicates that, in general, comparison of financial performance of Islamic banks in the period before fatwa and after fatwa does not show statistically difference. Likewise, the result of inter-bank analysis also indicates that there is no major difference in performance between Islamic banks and conventional banks in the period both before fatwa and after fatwa