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.

A Technical Review of BMS Performance Standard for Electric Vehicle Applications in Indonesia

Abstract: The development of Battery Management System (BMS) standards in Indonesia has been carried out causing the FACTS approach. That's approach makes it possible to accommodate all stakeholder requirements. However, the approach has not yet considered a technical review of the regulated standards. Based on this, this study undertook a comprehensive review of BMS performance parameters set out in the standard. In order that the regulated standards not only accommodate the needs of stakeholders but also consider BMS technical studies in order not to impede the future development of BMS.

Critical Nugget Diameter of Resistance Spot Welded Stiffened Thin Plate Structure

Abstract: Stiffened thin plate structure which is mostly applied to the car body structures consists of frame and sheet. It is a low cost method to reach a high-performance vehicle structure because of requirement low volume materials. Frame is thicker than sheet, so it acts as the reinforcement of this structure. The resistance spot welding (RSW) is generally used to join it. In this study failure modes of resistance spot welded thin plate structure, pullout and interfacial failure modes, were investigated based on thickness of joined plates and load secondary voltage to determine the critical nugget diameter. Three pairs of joined plates thickness of 1-1, 2-1 and 3-1 mm were spot welded using varied voltage in a range of 1.6 V to 2.3 V. The spot weld nugget of the stiffened thin plate structure joint were asymmetric form. Increasing welding voltage made the shear load bearing capacity of RSW joint increase. In the pullout failure, the bearing capacity increased if the thickness of joined materials increased. The experimental critical nugget diameter to guarantee pullout failure mode in the unequal sheet thickness joint of the stiffened thin plate structure decreased if the sheet thickness of joined materials increased. It was higher than nugget diameter obtained by AWS formula. AWS formula should be used carefully in the dissimilar sheet thickness joint of the stiffened thin plate structure.

Social Skills for Primary School Students: Needs Analysis to Implement the Scientific Approach Based Curriculum

Abstract: This research aims to describe the social skills of elementary school students as an important aspect of implementing the 2013 curriculum with a scientific approach. This research uses a descriptive qualitative approach. This research applies purposive sampling as a sampling technique. The number of informants in this research was 20 students in 3 different elementary schools. The elementary schools include Sekolah Dasar Negeri Sonorejo 01, SD N Bekonang 1, and Sekolah Dasar Negeri Kemasan 01. Data collection techniques used by the researcher include observation and documentation. The data were analyzed using data reduction, data presentation, and conclusion drawing techniques. The results show that 7 students (35%) have a good mastery of social skills. Meanwhile, 13 students (65%) were not good at mastering social skills in class. The data imply that the social skills of elementary school students are still low, which influences the implementation of the scientific approach to be un-optimal in the 2013 curriculum.

Conservation problems of mangrove ecosystem in coastal area of Rembang Regency, Central Java

Abstract: The aims of the research were to find out (i) species diversity of mangrove plats, (ii) the conservation problems of mangrove ecosystem, and (iii) restoration efford of mangrove ecosystem at coastal area of Rembang Regency, Central Java. This was descriptive research that was done qualitatively, in July until December 2003, at 3 sites of mangrove habitat in Rembang Regency, namely Pecangakan, Pasar Banggi, and Lasem. The data was collected in field surveys, in-depth interview to local people and/or local government, and examination of topographic maps of Java (1963-1965) and digital satellite image of Landsat 7 TM (July-September 2001). The result indicated that northern coast of Rembang had 27 mangrove species, i.e. 12 species of major mangrove, 2 species of minor mangrove, and 13 species of associated plants. Rhizophora had been dominated mangrove ecosystem in Lasem and Pasar Bangi; while Avicennia had been dominated in Pecangakan. The most degrading factors of mangrove ecosysrems were aquaculture and salt pond, timber logging, land reclamation and soil sedimentation, and environmental pollution. Mangrove restoration by Rhizophora in coast of Pasar Bangi had been successfully, because community based management. © 2006 Jurusan Biologi FMIPA UNS Surakarta Key words: conservation problems, mangrove ecosystem, Rembang Regency, Central Java Province.

Investigating carbon emissions in a production-inventory model under imperfect production, inspection errors and service-level constraint

Abstract: This paper discusses an integrated inventory model for vendor-buyer system with stochastic demand and service-level constraint. The buyer's demand follows a normal distribution and the lead time depends upon lot size. The buyer uses a periodic review policy to manage the inventory level. An imperfect production processes and inspection errors are considered in the model. Carbon emissions and energy impacts which are generated from transportation activity and production activity are also included in the model. An incentive and penalty policy are adopted to reduce the carbon emissions generated from supply chain system. The model contributes to the current literature by allowing the inclusion of imperfect production, inspection errors, carbon emissions and setup cost reduction. The objective of the model is to determine the review period, setup cost and the number of deliveries so that the total cost incurred has the minimum value. An iterative procedure is suggested to solve the model. A numerical example and sensitivity analysis are performed to illustrate the application of the model and to show the impact of the changes of key parameters on model behaviour.