Garuda - Garba Rujukan Digital

Article Per Year (5 Year)

All

TEKNIK

teknik
Website

Published by Universitas Diponegoro

ISSN : 08521697 EISSN : 24609919 DOI : -

Core Subject : Engineering,

Engineering

Journal yang mempublikasikan artikel-artikel ilmiah dari berbagai disiplin ilmu rekayasa/keteknikan. Artikel-artikel yang dipublikasikan di Jurnal TEKNIK meliputi hasil-hasil penelitian ilmiah asli (prioritas utama), artikel ulasan ilmiah yang bersifat baru (tidak prioritas), atau komentar atau kritik terhadap tulisan ilmiah yang dipublikasikan oleh Jurnal TEKNIK.

Arjuna Subject : -

Articles 11 Documents

1 2

Search results for , issue "Volume 33, Nomor 2, Tahun 2012" : 11 Documents clear

PENGARUH KADAR LUMPUR PADA AGREGAT HALUS DALAM MUTU BETON Purwanto, Purwanto; Arni Priastiwi, Yulita
TEKNIK Volume 33, Nomor 2, Tahun 2012
Publisher : Diponegoro University

Clay lumps on the aggregate levels is one of the factors that may cause disruption of the binding process andhardening of concrete. Clay lump can not blend with cement so that blocking a merger between the cement withaggregates which eventually led to the compressive strength of concrete will be reduced in the absence ofbinding to each other. SK SNI S-04-1989-F, the allowable levels of clay lump maximum of 5% to fine aggregate(sand) and maximum of 1% for coarse aggregate (split).In this study to determine the effect of the clay lump on the fine aggregate content on compressive strength ofconcrete on five (5) variations levels of the category of clean clay lump with content of 1% and 2%, medium claylump 4% and dirty sand with levels 7 % and 11%, whereas for the coarse aggregate clay lump content was0.7%.From the results of a study of 90 cylindrical specimens showed that the small amount of clay lump, the higherthe compressive strength of concrete. Concrete compressive strength test results on average with dirty clay lumpcontent was 31.30 MPa, compressive strength for the concrete medium with clay lump levels were at 33.92 MPaand compressive strength for the concrete clean of clay lump 36.68 MPa. Compared to the dirty clay lump anincrease in the levels of average compressive strength for moderate levels of 8,37% and the clean sand of17,19%. Besides affecting in compressive strength, clay lump levels also affect the weight of concrete, andconcrete density. The greater the level of clay lump, weight of concrete and concrete density will be lower.Compared to the dirty clay lump an increase in the levels of average concrete density for moderate levels of 6,54% and the clean sand of 12,59%.

POTENSI AIR TANAH DAERAH KAMPUS UNDIP TEMBALANG Dian Agus, Widiarso; Henarno, Pudjihardjo; Wahyu, Prabowo
TEKNIK Volume 33, Nomor 2, Tahun 2012
Publisher : Diponegoro University

Provision of clean water in an area need both now and future dating. Provision of clean water can be done byutilizing the potential of existing surface water and ground water. Geoelectric method is widely use forgroundwater investigation. Geoelectric observations at 10 observation points can generate Aquifer Zone Map ofTembalang and surroinding areas.

LINGKUNGAN KAMPUNG BERKELANJUTAN DAN POTENSI MASYARAKAT DI KAMPUNG KANALSARI, SEMARANG, INDONESIA. (Studi Kasus: Kampung Kanalsari â€“ Semarang) Sari, Widiastuti; Nany, Yuliastuti
TEKNIK Volume 33, Nomor 2, Tahun 2012
Publisher : Diponegoro University

Low-income communities tend to live in the urban village areas (defined as â€™kampongâ€™), which presence isprevalent in several major cities in Indonesia. Kampong is a neighborhood or residential area of low-incomepeople with poor physical conditions. Kampong is a traditional neighborhood which is marked by the features ofclose-knit relationships (Herbasuki, 1984). The legitimate land ownership motivates the people to build anddevelop houses and neighborhoods, in accordance with the economic ability of the family. Housinginfrastructure development that is generally taking place in the Indonesian kampongs are commonly carried outby the kampongsâ€™ residents together with the municipal government. This has been the common practice in orderto sustain and prevail the existence of the kampongs.This paper is the result of a study on the effects of infrastructure development that are viewed from theperspectives of physical conditions of the kampong as well as the socio-economic conditions of the communitiesin Kampong Kanalsari, Semarang, Indonesia. With the use of a mixed-methods approach coupled with aquantitative analysis, the outcomes of study are as follows: 1) residents of kampongs evidently have highmotivation to prioritize on the development of infrastructure; 2) there is a high level of social quality, whichproves that the character of the people who have harmonious society have and still survive in KampungKanalsari; 3) the development and improvement of village infrastructure that are conducted independently andby non-government institutions positively impacts the physical conditions of the housing environments, socialand economic conditions of the community. The influence of social conditions occupies the highest level becausethe development is carried out independently, based on the aspirations, interests and needs of the community,which ultimately provide benefits and advantages for the kampongâ€™s residents. This influence would directlyaffects the community as it increases their motivation to build and improve the housing conditions andenvironmental sustainability in order to ensure security and liveability of the residential area.

LIKUIFASI ENZIMATIK Î² - KAROTEN SEBAGAI FUNCTIONAL FOOD YANG TERDAPAT DALAM POMACE DARI BUAH LABU KUNING Herry, Santosa; Heny, Kusumayanti
TEKNIK Volume 33, Nomor 2, Tahun 2012
Publisher : Diponegoro University

Attempts to separate the Î² carotene contained in pomace or pulp byproduct pumpkin fruit juicing process(Cucurbitae moschata) is potential. The magnitude of benefit of Î²-carotene as a chemo preventive, high contentof Î²-carotene in pumpkin, strong pumpkin fruit shelf life and high content of Î²-carotene in the pomace, an initialconsideration of this research. Î²-Carotene enzmatik liquefaction using pectinase enzyme combination (P) andcellulose (C), subject to the pomace. liquefaction / hydrolysis carried out in a stirred tank reactor to determine:the most influential variable ratio between enzyme ratio P: C; temperature and pH. Influential process variableswas determined using two-level factorial design method Quicker. From the experimental results of the data if itis known that the degree of acidity of pH is the single most influential variable in the process of Î²-caroteneliquefaction presents in pumpkin fruit pomace.

RECOVERY GARAM LITHIUM DARI AIR ASIN (BRINE) DENGAN METODA PRESIPITASI Sumarno, Sumarno; Ratnawati, Ratnawati; A. Nugroho, A. Nugroho
TEKNIK Volume 33, Nomor 2, Tahun 2012
Publisher : Diponegoro University

Lithium demand increases as it is widely used as raw material for rechargeable battery, alloy for airplane, andfuel for fusion nuclear reactor. Lithium is an extremely reactive element, that it is never found as free element innature. Lithium compounds are found in earth crust, with very small concentration (20 â€“ 70 ppm) and totalcontent of more than 20 million tons. The biggest lithium reserve is in seawater (0,14 â€“ 0,25 ppm) andgeothermal water (7 ppm) with total amount of 230 billion tons. There is no industry applies the technology torecover lithium from seawater. Having a vast sea area and abundant geothermal sources, Indonesia needs todevelop a technology to recover lithium from both sources. This research is aimed to recover lithium fromgeothermal water. The experiment was conducted using synthetic and geothermal water with lithiumconcentration range of 220 â€“ 400 ppm, temperature range of 20 â€“ 40Â°C, and mixing time range of 1 â€“ 4 hours.The experiment was designed with 2 level factorial design. The results show that the most influencing variable ismixing time, while significant interaction amongst variables is not observed. Further experiment usinggeothermal water from Bledug Kuwu with initial lithium concentration of 400 ppm and temperature 30Â°Cresulted in optimum mixing time, i.e. 3 hours with 92,5% of the lithium could be recovered

KINETIKA TRANSESTERIFIKASI BIODIESEL JARAK PAGAR Luqman, Buchori; Setia, Budi Sasongko
TEKNIK Volume 33, Nomor 2, Tahun 2012
Publisher : Diponegoro University

Biodiesel were produced by trans-etherification of castor oil with alcohol in the presence of NaOH catalyst. Thereaction mechanism and model of castor oil trans-etherification isA + 3B C + 3 DA, B, C, and D were castor oil, alcohol, glycerol, and ester. The reaction rate equation was r=-dCA/dt =k1(CA)(CB)3â€“k2(CC)(CD)3. In this study was used two measurement method of free fat acid as the rest content ofcastor oil with SNI 01-3555-1998 and AOAC (Association of Analytical Chemist). It found that SNI 01-3555-1998 method was the easier and the acurate measurement. The classification of alcohol used was methanol andethanol to compare the action both of them. Methanol produces the higher conversion than ethanol. The reactionin a batch reactor with temperature 40, 50, and 60Â°C in atmospheric pressure as the operation condition tolooking for kinetics parameter of trans-etherification. Coefficient reaction rate and activation energy were lookinto kinetics study. Reaction rate was a mathematics model as a function of concentration and time which solvedby Runge-Kutta, multivariable optimization and SSE (some square error) method using Matlab. The activationenergy (Ea) and impact factor (A) obtained by linier regression method. The result of study obtained the kineticsparameter of trans-etherification with methanol k1=1.9313x1031exp (-41.940/RT) average error 0.0010 andk2=2.7678x1025exp(-37.362/ RT) average error 0.0003. While kinetics parameter of trans-etherification withethanol obtained k1=1.168x1019exp(-24.588/ RT) average error 0.0306 and k2=4.9966x106exp(-10.328/RT)average error 0.1589. It means, more reactive alcohol then bigger the value of kinetics parameter.

ASPEK PROSES DIAGENESIS TERHADAP SIFAT FISIK BATUPASIR FORMASI KEREK, DAERAH KALIPUTIH DAN SEKITARNYA, KECAMATAN SINGOROJO, KABUPATEN KENDAL, JAWA TENGAH Vahyu, Vanny Hertanto; Hadi, Nugroho; Prakosa, Rachwibowo
TEKNIK Volume 33, Nomor 2, Tahun 2012
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v33i2.4388

The sedimentary rock is formed and associated with the diagenesis processes, as all the physical, chemical, andbiological changes in the characteristics of a sediment accumulation from the time the grains are deposited untilthey are metamorphosed. This process is profoundly influence the characteristic of sedimentary rock, including thetexture, internal structure, mineral composition, cementation type, and pore space. Hence, it is important to knowor learn the stage of sandstone diagenesis, especially in the Kerek Formation to mark the correlation betweendiagenesis and physical properties of sandstone.The purpose of this research is to identify the stage of diagenetic processes, diagenetic environment, the type ofcementation, and the relationship between diagenetic stage and physical properties of sandstone. The methods usedin this research are survey method and data analysis method. The survey method includes the making of crosssectionalmeasured stratigraphy and data analysis method includes petrographic and scanning electron microscopy(SEM).The sedimentary structures found in the carbonate sandstones are burrows, convolute ripple lamination, gradedbedding, parallel lamination, cross lamination, current ripple lamination; which are features of turbidity deposition(Bouma sequence). Based on the petrography analysis results for sample P 01 and P 02 showed compaction,cementation, dissolution, and bioturbation, with a porosity value of 1 %. Sample P 03 showed compaction,cementation, dissolution, and bioturbation, with a porosity value of 7 %. Sample P 04 showed compaction,cementation, and dissolution, with a porosity value of 1 %. Sample P 06 showed compaction, cementation,dissolution and replacement, with a porosity value of 5 %. Sample P 07 showed compaction, and cementation, witha porosity value of 30 %. The Lithology type in the research area was Calcarenite with dominant shell fragment,the lithology names are Packed biomicrite (Folks, 1959; in Nichols, 2009), and Packstone (Dunham, 1962; inNichols, 2009). Carbonate sandstones predominantly feldspar and quartz minerals and the lihtology names areCarbonate quartz wackes (Pettijhon, 1975; in Nichols, 2009), and Carbonate feldspathic arenite (Pettijhon, 1975;in Nichols, 2009). There are three minerals type of cement showed in carbonate sandstones which are calcite,chlorite and pyrite cements.The results of this research indicate that the diagenesis stages of carbonate sandstones showed cementation,dissolution, replacement, bioturbation, and compaction processes, and the more stages of diagenesis that occurs incarbonate sandstones will result in reduced porosity and progressively up at for formation stratigraphy excelsiorsediment rock assess its porosity is equal to 1%, 5%, 7% and 15% respectively. The type of cement minerals in thecarbonate sandstone influence porosity, especially in carbonate sandstone which there are chlorite cement that havesmall porosity value of 1%, 5% and 7%. The environment of diagenesis in carbonate sandstones that is phreatic andburial experienced of eogenesis process, mesogenesis process and telogenesis process.

ANALISA KINERJA DAN TINGKAT KEPUASAN PELANGGAN PDAM KOTA UNGARAN KABUPATEN SEMARANG Bambang, Setiabudi; Suharyanto, Suharyanto; Syafrudin, Syafrudin
TEKNIK Volume 33, Nomor 2, Tahun 2012
Publisher : Diponegoro University

The need for water supply always increases with population growth and development of the region, demandingPDAM Semarang able to provide a better service to their communities.The issue of high rate of leak, the high discharge capacity untapped and range of services is still very low whichis a major problem for the Semarang District PDAM water supply for the City of Ungaran. Similarly on thequestion of the level of customer satisfaction and service performance should be analyzed so that companies canknow the goals and strategies in improving water services to the community.Customer satisfaction to water supply services, measured in terms of customer perception in the use of watersupply. The analysis showed that customer satisfaction in the category of high levels of satisfaction are stronglyinfluenced by water pressure, adequacy of water use, quality of complaints handling and accuracy of watermeter readings.The results of the performance assessment of water services which refers to two normative rules, namely No.47of 1999 Kepmendagri obtain the final value of 58.16 is included in the category of adequate and appropriatecriteria BPPSPAM obtain the final value of 2.055 is included in the healthy category.From the results of the performance analisia taps and customer satisfaction level analysis shows that there aresome indicators of corporate performance and customer satisfaction needs to be improved and enhanced.

POTENSI MIKROALGA SEBAGAI SUMBER BIOMASA DAN PENGEMBANGAN PRODUK TURUNANNYA Noer, Abyor Handayani; Dessy, Ariyanti
TEKNIK Volume 33, Nomor 2, Tahun 2012
Publisher : Diponegoro University

The first use of microalgae by humans as food detected in the dates back 2000 years, but the development ofbiotechnology of microalgae just began in the middle of this century. Microalgae refer to biomass resourcecontain many useful components such as protein, carbohydrate, fatty acid, etc. Products based microalgae arediverse from human food and nutrition, animal feed and nutrition up to fine chemicals such as triglycerideswhich is able to be converted to biodiesel. Microalgae is a promising biomass resources, (i) microalgae isrenewable resources which has high biodiversity properties, (ii) production cost of converting process frommicroalgae biomass into its derivatives relatively low, (iii) product derivatives of microalgae have a highdemand in market. Based on above, microalgae can be developed further to be applied as raw material for food,energy and pharmacy. This paper described microalgae in general and the developing technology used toproduce commercial microalgae based product.

OPTIMALISASI SISTEM PENGELOLAAN SAMPAH DI LINGKUNGAN KAMPUS UNIVERSITAS DIPONEGORO: UPAYA MENUJU UNDIP ECO-CAMPUS Wiharyanto, Oktiawan; Titik, Istirokhatun; Nur, Fajar S. S
TEKNIK Volume 33, Nomor 2, Tahun 2012
Publisher : Diponegoro University

Diponegoro University as a leading institution of higher education in Central Java is expected to be a pioneerand an example in terms of waste management. But in fact now has Undip not have an adequate system of wastemanagement. Current conditions almost all existing studies program has been concentrated in the campus areaTembalang still treats conventional waste by dumping it in the trash is mixed with and without prior sortingwhich will eventually increase the weight of the existing TPS and TPA. This makes the system of wastemanagement in the UNDIP really need to be evaluated and reviewed. This study dimaksudakan to optimizewaste management system with the principles of the 3R (reuse, reduce, recycle) in order to minimize the wasteproblem. Besides this optimization also as an effort to realize the vision of the university Undip asenvironmentally friendly (eco-campus) and a role model for waste management agencies and other institutions

Page 1 of 2 | Total Record : 11

1 2

Filter by Year

2012 2012

Filter By Issues

All Issue Vol 46, No 3 (2025): Vol 46, No 3 (2025): July 2025 Publication in-progress Vol 46, No 3 (2025): Juli 2025 Vol 46, No 2 (2025) April 2025 Vol 46, No 1 (2025) January 2025 Vol 45, No 3 (2024): December 2024 Vol 45, No 2 (2024): August 2024 Vol. 45, No. 1 (2024): May 2024 Vol. 44, No. 3 (2023): December 2023 Vol. 44, No. 2 (2023): August 2023 Vol. 44, No. 1 (2023): May 2023 Vol. 43, No. 3 (2022): December 2022 Vol. 43, No. 1 (2022): May 2022 Vol 42, No. 3 (2021): December 2021 Vol. 42, No. 2 (2021): August 2021 Vol 41, No. 3 (2020): December 2020 Vol 41, No. 2 (2020): August 2020 Vol 41, No. 1 (2020): May 2020 Vol 40, No. 3 (2019): Desember 2019 Vol 40, No. 2 (2019): Agustus 2019 Vol 40, No. 1 (2019): Mei 2019 Vol 39, No. 2 (2018): Desember 2018 Vol 39, No 1 (2018): (July 2018) Vol 38, No 2 (2017): (Desember 2017) Vol 38, No 1 (2017): (Juli 2017) Vol 37, No 2 (2016): (Desember 2016) Vol 37, No 1 (2016): (Juli 2016) Vol 36, No 2 (2015): (December 2015) Vol 36, No 1 (2015): (Juli 2015) Vol 35, No 2 (2014): (Desember 2014) Vol 35, No 1 (2014): (July 2014) Volume 34, Nomor 3, Tahun 2013 Volume 34, Nomor 2, Tahun 2013 Volume 34, Nomor 1, Tahun 2013 Volume 33, Nomor 2, Tahun 2012 Volume 33, Nomor 1, Tahun 2012 Volume 29, Nomor 3, Tahun 2008 Volume 32, Nomor 3, Tahun 2011 Volume 32, Nomor 2, Tahun 2011 Volume 32, Nomor 1, Tahun 2011 Volume 31, Nomor 2, Tahun 2010 Volume 31, Nomor 1, Tahun 2010 Volume 30, Nomor 3, Tahun 2009 Volume 30, Nomor 2, Tahun 2009 Volume 30, Nomor 1, Tahun 2009 Volume 29, Nomor 2, Tahun 2008 Volume 29, Nomor 1, Tahun 2008 Volume 28, Nomor 3, Tahun 2007 Volume 28, Nomor 2, Tahun 2007 Volume 28, Nomor 1, Tahun 2007 In Press More Issue

Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name
-

Contact Email
-

Phone
-

Journal Mail Official
-

Editorial Address
-

Location
Kota semarang,

Jawa tengah

INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name -

Contact Email -

Phone -

Journal Mail Official -

Editorial Address -

Location Kota semarang, Jawa tengah INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Contact Name
-

Contact Email
-

Phone
-

Journal Mail Official
-

Editorial Address
-

Location
Kota semarang,

Jawa tengah

INDONESIA