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All Journal Semesta Teknika Journal of Civil Engineering Equilibrium Journal of Chemical Engineering
Suwardi, Suwardi
Universitas Muhammadiyah Surakarta
Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Engineering Materials Science & Nanotechnology

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Analisis Waktu Perjalanan Terhadap Pembukaan Jalur Lingkar Selatan Surakarta Menggunakan Program TFTP Suwardi, Suwardi
Semesta Teknika Vol 11, No 2 (2008): NOVEMBER 2008
Publisher : Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Surakarta road network services high traffic volume to/from Surakarta city. It is caused by the activities are still centered. In addition, outside road network of city which is provided for traffic only passing Surakarta city is not available yet. Therefore, a Surakarta road network needs urgently to be expanded and a proposed ring-road is considered necessary. In order to anticipate the future traffic condition, effects of a proposed ring-road is studied. The aim of study is to predict the future traffic condition in terms of effective journey time after a proposed ring-road is implemented using Teacher Friendly Transportation Program (TFTP). The results show that effective journey time in 2009 and 2014 was significantly reduced after opening the proposed ring-road in the Surakarta road networks. The efficiency of journey time in 2009 was predicted in the range of 8 to 9 minutes for three alternatives and in 2014 was about 9 to 11 minutes. Meanwhile, the journey time for ring-road in 2009 was estimated in 17.1 minutes with the efficiency of journey time for alternative 1, 2 and 3 was calculated in 17.9, 10.9 and 13.9 minutes, respectively. The journey time for ring-road in 2014 was found to be 19 minutes with the efficiency of journey time for alternative 1, 2 and 3 is 20, 17.5 and 15, respectively.  
Karakteristik Parkir di Rumah SakitKostati Surakarta Suwardi Suwardi
Semesta Teknika Vol 13, No 1 (2010): MEI 2010
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v13i1.723

Abstract

Parking is very crucial, mainly in the city areas. It often disturbs the traffic. Nowadays, many hospitals provide insufficient parking areas. This research was carried out in the Kustati hospital, Surakarta. The aim of the research is to study the parking characteristic that is expected t o be useful in planning and managing the future parking in the Kustati hospital. The result showed that the existence of parking maneuver and the service degree of traffic in front of the Kustati hospital is ranging between C and D because of parking influenced to be D and E. The parking influenced maneuver towards the decrease of speed found out to be y = 31.3x + 14.22. The average parking accumulation of motor cycle maximum is 701. The average maximum of parking index is 123%. The majority of parking duration is 6 up to 7 hours (29 vehicles). The parking volume is about 1757 vehicles. Parking turn over is 3.1 vehicles . Therefore, it requires 198 m2 of additional parking area. The average of maximum of car parking accumulation is 84 cars. The maximum parking index is 105%. The majority of parking duration is 5 up to 6 hours (41 cars). The parking volume is 245 cars. Parking turn over is 3.1 cars.
Analisis Waktu Perjalanan Terhadap Pembukaan Jalur Lingkar Selatan Surakarta Menggunakan Program TFTP Suwardi Suwardi
Semesta Teknika Vol 11, No 2 (2008): NOVEMBER 2008
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v11i2.760

Abstract

Surakarta road network services high traffic volume to/from Surakarta city. It is caused by the activities are still centered. In addition, outside road network of city which is provided for traffic only passing Surakarta city is not available yet. Therefore, a Surakarta road network needs urgently to be expanded and a proposed ring-road is considered necessary. In order to anticipate the future traffic condition, effects of a proposed ring-road is studied. The aim of study is to predict the future traffic condition in terms of effective journey time after a proposed ring-road is implemented using Teacher Friendly Transportation Program (TFTP). The results show that effective journey time in 2009 and 2014 was significantly reduced after opening the proposed ring-road in the Surakarta road networks. The efficiency of journey time in 2009 was predicted in the range of 8 to 9 minutes for three alternatives and in 2014 was about 9 to 11 minutes. Meanwhile, the journey time for ring-road in 2009 was estimated in 17.1 minutes with the efficiency of journey time for alternative 1, 2 and 3 was calculated in 17.9, 10.9 and 13.9 minutes, respectively. The journey time for ring-road in 2014 was found to be 19 minutes with the efficiency of journey time for alternative 1, 2 and 3 is 20, 17.5 and 15, respectively.  
Analisis Kinerja dan Tarif Angkutan Umum Bus Jurusan Surakarta-Yogyakarta: Studi Kasus pada Bus Langsung Jaya, Jaya Putra dan Sri Mulyo Suwardi Suwardi
Semesta Teknika Vol 12, No 1 (2009): MEI 2009
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v12i1.743

Abstract

One of the supporting factors to improve connection between Surakarta and Yogyakarta, is the adequacy of public transportation. With the existence of adequate public transportation that meet the standard, especially Yogyakarta – Surakarta buses, activities in the two cities can be expected to increase. The activities can be economic, politic, social, safety, scientific or the others.  The existing public transportation between Surakarta – Yogyakarta, needs to be evaluated because public might not satisfy the standard. The objective of the research is to analyse the operational cost and tariff of public buses serving Yogyakarta – Surakarta line.  The method of this research is descriptive analysis.  In this research, public work on transportation in this region was analyzed in order to improve its condition in the future. Primary data include the number of passenger, travel time, departure and arrival time.  Secondary data obtained from the bus companies consist of direct and indirect operational costs, as well as fixed and variable cost. The results show that the passenger tariff after yield analysis with headway 4 minutes and the average load factor of 55.83% is IDR 8,720. At headway of  4 minutes and passenger tariff of IDR 8,000 bus companies are still suffering from loss. If the headway changed to 6 minutes , the load factor became  83.75%  and the passenger tariff of IDR 5,800. It is lower than the current passenger tariff of IDR 8,000. The changing of headway from 4 minutes to 6 minutes may increase bus company profit by 27%. 
REQUIRED EVALUATION OF ARMADA AND SPECIFIED TARIFF OF TAXI IN SURAKARTA Suwardi Suwardi
Journal of Civil Engineering Vol 30, No 1 (2010)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (164.077 KB) | DOI: 10.12962/j20861206.v30i1.1725

Abstract

The research objectives were analyzed the number of taxis as well as the operational cost in field conditions. Analyzing the balanced of public transport following by its performance. Research benefits as an input to the Surakarta government as the policy holder and also for the entrepreneur as a control of construction with profit oriented. This study used the descriptive analytic method. The analysis result are the number of taxi with six businessmen, the total fleet was 479 fleets, after the analysis was 412 fleets, mileage taxis every day in the field was 228 km/day, after the analysis was 266 km/day. Mileage taxis fill every day in the field was 157 km/day, after analysis was 182 km/day. When operating in the field and the analysis was 22 hours/day. Travelling time in the field was 8 hours/day. After the analysis was 9 hours/day. Load factor of taxi in the field was 69%. Load factor after the analysis was 81%. Load factor of time was 37% field conditions. Load factor was 43% after analysis. Tariffs field condition was 2.769/km. after analysis was 2.410/km, while taxi fares in the field was 2.750/km.
Karakteristik Bioplastik Kitosan-Onggok Aren (Arenga pinnata) dengan Penambahan Serbuk Kunyit Suwardi Suwardi; Nur Hidayati
Equilibrium Journal of Chemical Engineering Vol 4, No 2 (2020): Volume 4 No 2 December 2020
Publisher : Program studi Teknik Kimia UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/equilibrium.v4i2.47911

Abstract

Abstrak. Bioplastik merupakan plastik organik yang salah satu fungsinya dapat digunakan sebagai pengemas bahan pangan. Bioplastik dikenal ramah lingkungan karena mudah terdegrasi oleh alam. Kitosan dapat dimodifikasi dengan pati onggok aren dalam pembuatan bioplastik untuk meningkatkan kekuatan bioplastik. Penambahan kunyit ke dalam bioplastik kitosan-serat onggok diharapkan dapat meningkatkan ketahanan terhadap mikroba sehingga bioplastic tersebut dapat digunakan sebagai bahan kemasan makanan.  Penelitian ini bertujuan untuk mengetahui karakteristik bioplastik kitosan-onggok aren yang ditambah kunyit dengan variasi 0,3- 1,2 %. Uji fisik yang dilakukan meliputi uji daya serap air, uji kuat tarik, uji elongisitas dan uji biodegradasi. Peningkatan banyaknya kunyit dalam air meningkatkan sifat daya serap air, kuat tarik dan biodegradasinya, sedangkan penurunan kemuluran plastik berkurang dengan peningkatan banyaknya kunyit dalam plastik.Abstract. Bioplastics are organic plastics which one of their functions can be used as food packaging. Bioplastics are known to be environmentally friendly because they are easily degraded by nature. Chitosan can be modified with onggok palm starch in making bioplastics to increase the strength of the bioplastics. The addition of turmeric to the chitosan-onggok bioplastic is expected to increase resistance to microbes so that the bioplastic can be used as a food packaging material. This study aims to determine the bioplastic characteristics of chitosan-onggok palm sugar added with turmeric with a variation of 0.3-1.2%. Physical tests carried out include water absorption test, tensile strength test, elongicity test and biodegradation test. The increase in the amount of turmeric in water increases its water absorption, tensile strength and biodegradation properties, while the decrease in plastic elongation decreases with the increase in the amount of turmeric in the plastic.
Co-Authors Nur Hidayati