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Category: Abstrak Unggulan

Pengembangan Kanal Fleksibel Berbahan Beton Memadat Mandiri Berserat Limbah Kaleng dan Limbah Plastik

By: Sholihin As’ad, Purnawan Gunawan

The flexible duct is a flexible structure of building utility component for electricity andtelephone cable network. This component is series of straight form duct module and junctionwith a flexible connector system. Duct alignment, both vertical and horizontal, is able to beadjust to limited space following the underground situation and its base position. The 1st batch of research grant has resulted an optimum mix design of self compacting concrete(SCC) combined with waste plastic fibre. Self compacting concrete is a modified viscous concrete that allow it to flow by its self weight in concrete framework without vibrator. The concrete mix design per one meter cubic concrete production comprises 400 kg Cement Portland, 1397 kg of aggregate with 40% of coarse aggregate and 60 % of fine aggregate, 0.5 % of plastic fibre, 80 kg of fly ash, 3,2 kg of superplasticizer (viscocrete) with 0.40 of water cement ratio. On fresh concrete test the SCC with plastic fibre recorded 720 mm diameter of slump flow, 3 second of t500, 8 second of V-funnel pouring time, 5 second of t200 , 12 second of t400 and 0,96 of, self-leveling ratio (h2/h1) by L-Box , perfect or 1 self-leveling ratio (h2/h1) by U-box test. On hardened concrete properties this mixture recorded 33 MPa

of compressive strength, 32711 MPa of elastic modulus. Early age shrinkage showed shrinkage delay time from t0 = 146 minutes to 194 minutes, 47 % the cumulative crack length reduction and 53% of crack width reduction compared to SCC without fibre. This SCC mix design is referred for mixing the row material of the flexible duct. The second batch of this research grant aims to design cable duct module, module junction and its connector device. The optimum dimension is determined from the criteria of hardened concrete surface appearance, compact appearance index, production cost and simplicity in installation. The optimum inter-straight module and the junction-module connecting system are chosen from three alternatives of connecting systems, those are bolt connector, metal bar connector and concrete connector. The result indicated that the optimum dimension of straight module is 600 mm length, 200 mm height, 200 mm width and 25 mm to 45 mm of the average thickness. There are four possibilities of connector system for the straight and junction module. The concrete simple connector was the easy system for installing and dismantling and a bit lower cost production, however it is less in bond connector strength. Meanwhile the connector system that combined with steel bolt component was quite strong in connecting the duct module, however its cost production was higher and need longer time for installation and dismantling.


Keywords: sugar palm fiber, albizzia sawdust, sandwich composite, mechanical properties

By: Budi Legowo, Kuncoro Diharjo, Jamasri

This study aims to investigate the optimum design of sandwich composite reinforced sugar palm fiber (SPF) with albizzia sawdust (AS) core and investigate effect of thermal cyclic and dynamic flexural loading on mechanical properties. The SPF was alkali treated (5% NaOH) to remove lignin. The matrix used for skin composite reinforced SPF was unsaturated polyester resin (UPRs), whereas urea formaldehyde (UF) resin was used as binder of the core. The result shows that the skin composite reinforced by 4 hour of alkali treated fiber has the highest strength. By using press mold method, the optimum fiber content of the skin composite is about 30-35% (v/v). The 60% of sawdust content (w/w) results the highest mechanical properties of core. By using the optimum properties of skin and core, the sandwich composite, whose 2 mm of skin and 10 mm of core thickness, has better mechanical performance compared to that with other dimension. The sandwich composite, treated by using thermal cyclic, has lower mechanical properties compared to untreated composite. The increasing of temperature and cyclic number decreases the bending strength and impact toughness of the sandwich composite. For dynamic flexural loading test, the increasing of load cyclic number increases deflection and decreases stiffness of the sandwich composite. This composite has a good opportunity to be applied for housing and furniture panels.

Model for Poor Women Empowerment through Family-Based Entrepreneurship towards Creative Economy in Karanganyar Regency

Keywords: creative economy, family-based entrepreneurship, poor women

Ismi Dwi Astuti & Sri Marwanti

This research underlines several issues concerning the empowerment of poor women through family-based entrepreneurship towards creative economy. The research was intended to explore the potentials, constraints, opportunities and policies dealing with the empowerment of poor women, and to formulize a model for the empowerment.

Data collection consisted of site observation, Novomatic bietet exklusive, bestbewertete kostenlose spielautomaten spiele ohne Anmeldung und ohne Einzahlung mit klassischem 5-Walzen swoie 9-Gewinnlinien-Design, Scatter und Freispielen mit Wild-Symbolen. interview, focus group discussion, and document study. The techniques of analysis employed in this research included interactive analysis and gender analysis by Sara Longwee.

The results of this research was a model named “Pro-poor Capacity Improvement” which highlights several components including poor women’s potentials, constraint, opportunities, interventions in the form of family-based entrepreneurship, and welfare.

Utilization of Desalination Waste for Synthesis of Mg/Al Hydrotalcite-Like as raw Material Pharmacy Industries

Keyword : preparation, characterization, Mg/Al HTlc, brine water, raw material, pharmacy

By: Eddy Heraldy and Yuli Puspito Rini

The synthesis of Mg/Al hydrotalcite-like (HTlc) using brine water from desalination waste for raw material pharmacy industries has been performed. Sample preparation of Mg/Al HTlc are using artificial brine water and brine water from desalination waste of PLTU Tanjung Jati B, Jepara, Central Jawa, respectively. Firstly, calsium content in brine water was removed by adding mixed solution Na2CO3-NaHCO3 with agitation for 1 h at 95±2⁰C. Then, into calcium free brine water was added AlCl3 with Mg/Al molar ratio of 2.0. With constant pH at pH 10.5±2, the solution was then continuously stirred for 1 hour at 70⁰C. The suspension product was filtered off, washed with distilled water until free of chloride ion. After that, all samples were dried overnight.

The obtained samples were characterized by powder X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy and surface area measurements. According to XRD results, the present study was able to show that the sample exhibit the (003) reflection around 7.6Ǻ, typical for Mg/Al HTlc with carbonate interlayer. This condition were supported by FT-IR results that characteristic of hydrotalcite peak appears around 3500 cm-1 are attribute to the stretching mode of OH groups, the wavenumber between 3000-3100 cm-1 due to hydrogen bonding of interlayer water with interlayer carbonate anion and the bending vibration of interlayer water is found around 1630 cm-1. Antisymmetric vibration of carbonate anion were shown around 1350-1400 cm-1, while corresponds to lattice vibrations of Mg-O, Al-O and /or Mg-O-Al are found below 1000 cm-1. From XRD and FT-IR characterization were proven that synthesis result is Mg/Al HTlc. In addition, the spesific surface area result was 30.82 m2.g-1 and be classified as microporous. Because Mg/Al HTlc synthesized has a relatively big spesific surface area, the sorption capacity of Mg/Al HTlc would be big too. From this preliminary studies, therefore, Mg/Al HTlc from brine water as possible as a raw material pharmacy industries.

Management Model Spatial Environment Friendly Village in Rural Areas Slopes of Mount Lawu

Key words : Rural environment lay-out, environmentally friendly, Mount Lawu.

By: Galing Yudana, Bambang Pujiasmanto, Widharyatmo

The objectives of this multi-year research were: 1) to identify land use in Ngargoyoso Karanganyar; 2) to explore the behavior pattern of the society in managing the environment; 3) to identify the society’s perceptions of environmental management; 4) to identify the local government’s programs dealing with environmental management; 5) to identify the internal and external factors related to environmental management; and 6) to formulate a model for sustainable rural environmental management in Ngargoyoso Karanganyar Central Java. Data were analyzed using several techniques including 1) Interactive analysis; 2) Internal-External model of analysis; Participatory approach; and 4) Collaborative approaches.

Results indicate that in performing community-based sustainable rural environmental management there were several factors related to the behavior of the local society and their perceptions of environmental management, government programs and internal and external factors. These factors need to be addressed when discussing environmental management.

Therefore, a model was formulized to perform appropriate environmental management. The model is called CBREM (Community-Based Rural Environmental Management).