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Jurnal Penelitian Saintek

saintek
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Published by Universitas Negeri Yogyakarta

ISSN : 14123991 EISSN : 25287036 DOI : 10.21831

Core Subject : Science,

Decision Sciences, Operations Research & Management

Arjuna Subject : -

Articles 7 Documents

Search results for , issue "Vol 15, No 2: Oktober 2010" : 7 Documents clear

TECHNOLOGY DEVELOPMENT OF LEATHER PRESERVATION FOR CRAFT HANDICRAFT PRODUCTS Zulfi Hendri; Retno Arianingrum
Jurnal Penelitian Saintek Vol 15, No 2: Oktober 2010
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The purpose of this research is developing preservation technology of the Pondoh zalacca and Zalacca Gading peel for craft products material. The study begins with analyzing content, water, carbohydrates, and proteins in the peel of zalacca that is the cause of the growth of fungus and microorganisms. The next step is preservation using borax, formalin, and chlorine at concentrations: 2, 4, 6, 8, and 10%. The activity of fungal growth on the peel were observed in microscopic, and the characteristics of materials for craft products made by observing the characteristics of the peel including the texture, softness, andfracture. The results showed that the bark peel has high content of water which is 74.67% in Pondoh zalacca and 30.06% in zalacca gading. The carbohydrate content of Pondoh zalacca peel at 3.8%, and zalacca gading peel at 5.5%. Protein content at 0.565% in Pondoh zalacca and 1.815% in zalacca gading. The observation for 3 (three) months showed preservation with borax, formalin, and chlorine at all concentrations effectively prevent fungal growth. The good peel elasticity of Pondoh zalacca and Gading produced by using borax, formalin, and chlorine in the concentration of below 6%, while giving preservative chlorine above 4% make the peel a -little whiter, and preservation of over 4% borax makes chapped peel so it is difficult to be attached to the craft media. Keywords: Technology, Preservation, Zalacca peel, and Art Crafts

WELDING TECHNICAL CLINIC ANALYSIS OF WELDING SMAW WELDING IN VEHICLES OF DISTORTION RECESSING Heri Wibowo; Riswan Dwi Jatmiko
Jurnal Penelitian Saintek Vol 15, No 2: Oktober 2010
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Contplicated distortion alu,ays )tappens in metel melting and.freezirtg proL'ess on welding Lip trt now, the common merhod to recluce distnrtion are; base ntetal prehettling, heat irtput minirualization, welding process sequence, etc. the last has been u,setJ l:y tr'r,Uort, hov:ettet' lhe sequence ofbest effectivitlt and elficiency has not been yet studied. This research aims to lnow ffict of welding process sequence b), sttrdied 5 dil/brent v,elding route related to angle distortion (a), bending distortion (0), c'ross distortian (LI .l anci atial distortion (LP). 'tilelding process used sltielded metal arc welding, base metal ofST 37 and electrode of E6013; 2.6 mm and 3.2 mm of diameter. Fou'kinds oJ te,st used ungle gauge oJ 0.lo precision ctnd caliper of 0.05 mm precision.Based on the test, it could be known that the lov:est angle distortion toctk pluc:e on 3 tirues roule that was 3.07", while the highest happened at 5 times route methoci thai v'Lts 9.23". the lov'esl ben.ding distortion took place on I and 3 lintes route thal wctre 1.50 mm anci 1.52, respectit'e1.1:, wh.ile the highest happened at 5 times rrnrte ruethod that wqs 1 70 rnnt. Cross clistortictn ancl ctnglc distortion tended to have lowest distortion at 3 titnes route, v,hile axial distortion and bentling distortion at I and 3 times routes. All that kinds of dislortion had llte lowest valtte ctt 3 times rotfie v'hichwas the best welding route at sheet ntetal ctf 5 nmt thickness.

PERFORMANCE OPTIMIZATION OF BEAM CONCRETE BEAMS TO INCREASE BUILDING STRUCTURE PERFORMANCE IN EARTHQUAKE AREA Agus Santoso; Slamet Widodo; Nuryadin Eko Raharjo
Jurnal Penelitian Saintek Vol 15, No 2: Oktober 2010
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The paper summarizes the experimental result of flexural capacity of full scale reinforced concrete beam prepared as a composite members consisting of two concrete layers made of Hybrid Fiber Reinforced Concrete (HFRC) and High Strength Concrete (HSC). Compressive strength and modulus of elasticity test, splitting tensile, flexural tensile tests conducted to identify the important mechanical properties of both HFRC and HSC. Every mechanical properties data collected using 3 standard samples based on ASTM and SNI codes. 15 reinforced concrete beams in 150x250x2400 mm dimensions, usedfor full scale flexural test of structural RC beam. The tests conducted on 5 types of composite beam: 100%, 75%, 50%, 25%, and 0% of HSC cross sectional depth, combined with HFRC for the opposite sides.The experimental results indicated that HFRC shows higher modulus elasticity compared with HSC, it was 28618,611MPafor HFRC, and 21790,660 MPafor HSC. All types of composite members and full depth of HFRC shows higher first crack load capacity compared with HSC structural reinforced concrete beam. The first crack load capacity increase ranging from 29,753% up to 33,267%. All types of composite members and full depth of HFRC also shows higher maximum load capacity compared with HSC structural reinforced concrete beam. The first crack load capacity increase ranging from 11,284% up to 16,03%. Based on the experimental test results, it can be suggested to apply partial depth of HSC and HFRC; 50% HSC and 50% HFRC on static determinate RC beam.Keywords: Composite Reinforced Concrete Beam, HFRC, HSC, Full Scale Flexural Test

EFFECT OF PENDING IN PENDING IN PARTICULAR PAD A PAJAH GEM OF DOUBLE CUT Didik Nurhadiyanto
Jurnal Penelitian Saintek Vol 15, No 2: Oktober 2010
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The purpose of this study, are (1) to compare the wear of a single cutter with a double cutter with the use of different cooler viscosity, (2) to determine the effect of cooller viscosity to cutter wear, and (3) find a suitable viscosity, cooling to reduce cutter wear. The workpiece material is VCN 150 ø 1.75 inches with a length of cut is 200 mm. Variables that are altered depth of cut. The depth of cut is defined initial minus end diameter divided by two. The depth of cut for a double edged pieces with a single piece. Cutter wear modifications largest taken from each eye piece for comparison with a single cutter. Research steps undertaken were as follows: wear to keep records of each viscosity cooling, ie 14.5 poise, poise 24.8, 35.6 poise, and poise while the depth of 49.2 pieces 0.5; 1; 1.5; and 2 mm. Each observation performed 3 times and subsequently taken average. Comparing the wear obtained in cutting using single and double cutting. The results of this study are as follows: (1) a reduction in the cutter wear double edged pieces of 18.64% compared with a single cutter with variable thickness and depth of cut cooling. (2) work without cooling wear very large, so that liquid cooling is needed in the process of cutting the workpiece, (3) become less viscous cooling is used, a reduction in wear and tear on the range. Wear and tear occurs in the thickness of the smallest 14.5 poise.Keywords: cooling, wear, and the depth of cut

Cytotoxic Effects of Plant Growth Extracts Temu Giring (Curcuma Heyneana) and Temu Ireng (Curcuma Aeruginosa) against Several Cancer Cells Sri Atun; Nurfina Aznam; Retno Arianingrum; Sri Nurestri
Jurnal Penelitian Saintek Vol 15, No 2: Oktober 2010
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The purpose of this study is to investigate the cytotoxic activity of extracts and fractions of the rhizoma from temu giring and temu ireng against some cancer cells, such as breast carcinoma cells (MCF-7) and cervical carcinoma (Ca Ski). The research method is to do with experiments in the laboratory which includes extraction and fractionation of compounds from the rhizome from temu giring and temu ireng, test the cytotoxicity against cancer cells Breast carcinoma (MCF-7) and cervical carcinoma (Ca Ski). Test results on the activity of extracts and fractions from tubers from temu giring and temu ireng on breast carcinoma (MCF-7); Cervical carcinoma (Ca Ski) showed good activity (below 100 µg/ml), except the methanol extract temu ireng which shows the IC50 upper of 100 µg/ml. This indicates that the extracts from temu giring and temu ireng great potential for development as anticancer drug.Keywoods: Curcuma heyneana; Curcuma aeroginosa; cytotoxic effect; anticancer

BIODEGRADATION OF POLYURETAN RESULTS OF SYNTHESIS OF SOYBEAN OIL, GLYCOLOLY POLYOKYLETHLES, AND METHYLES-4,4'-DIFENILDIISOSIANAT Eli Rohaeti; Senam Senam
Jurnal Penelitian Saintek Vol 15, No 2: Oktober 2010
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The objective of research were to synthesize polyurethane from soybean oil, P EG400 and MDI, to determine the cross linking, and to learn the influence of incubation times toward degradability of polyurethane. Polyurethane was synthesized from soybean oil and oxydated soybean oil at room temperature followed by curing for 10 hours at 70 DC,and than at 100 "c for 3 hours. The synthesis was conducted with mass compositionSBOI OSBO : P EG400 : MDI = 1 : 2 : 3. Biodegradation was conducted by usingmicroorganism in an actived sludge of malka medium at 37°C. The variation of incubation times were 5, 10, 15, 20, 25, and 30 days, respectively with changes of media every 5 days. Characterizations of polyurethane were functional groups, cross linking, mass loss and biodegradability. The oxydated soybean oil has increased intensity of -OR functional group, hydroxyl number, density, melting and boiling point, otherwise the refraction index has decreased. The synthesized polyurethane has characteristic absorption of urethane functional group and cross link. The increasing of incubation time can decrease biodegradability of polyurethane. The mass loss of polyurethane from SBO-PEG400-MDI has the higher. Biodegradation can disappear urethane group and decrease crystallinity of polyurethane. Key words: biodegradation, mass loss, crystallinity, polyurethane

INFLUENCE OF REMELTING ON ALUMINUM ALUMINUM RAIN Aris Budiyono; Jamasri Jamasri
Jurnal Penelitian Saintek Vol 15, No 2: Oktober 2010
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The purpose of this research is to observe the effect of remelting on fatigue crack growth rates of the aluminum alloys. The material used in this research was selected aluminum scraps. The material was melt and cast at temperature of 745°C in the metal molding, then was made specimen according to ASTM E. 647. The remelting was done three times at the same condition. The fatigue crack growth rate testing was performed in a room temperature condition with a constant load amplitude and the load ratio was maintained to be 0,3.The experiment result show that remelting can increase fatigue crack growth rates whichwas shown by increasing ofn exponential values (I" remelting was 4,4285 MFa.mo,s, 2nd4,5562 MFa.mo,s, and 3rd 4,6078 MFa.mo,5)Key words: remelting, fatigue crack growth rates, aluminum alloys

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