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All Journal Cakrawala Pendidikan Jurnal Penelitian Saintek SAINSTECH: Jurnal Penelitian dan Pengkajian Sains dan Teknologi
Endang Widjajanti
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Biochemistry, Genetics & Molecular Biology Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Engineering Mechanical Engineering

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PENERAPAN PRAKTIKUM KIMIA BERMUATAN LIFE SKILLS SEBAGAI UPAYA MEMPERSIAPKAN CALON GURU YANG BERKARAKTER Endang Widjajanti
Jurnal Cakrawala Pendidikan No 3 (2010): Mei 2010, Th. XXIX, Edisi Khusus Dies Natalis UNY
Publisher : LPMPP Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/cp.v1i3.256

Abstract

Abstract: Character Education for Chemistry Students Through PracticumsLaden with Life-Skills. This study aims to build chemistry students charactersthrough Physical Chemistry I and II practicums laden with life skills. This actionresearch study consisted of four steps, i.e. planning, action, observation andreflection and involved students joining Physical Chemistry I and II laboratorywork. The study focused on psychomotor and affective aspects. The instrumentswere observation sheets and questionnaires. The data were analyzed using thequalitative descriptive technique. The results show that Physical Chemistry I and IIlaboratory work activities laden with life skills can build students characters. Theycan develop such characters as discipline, responsibility, obedience, thoroughness,thriftiness, truthfulness, gentleness, tolerance, initiative, creativeness, and wisdom.Keywords: life skills, character building
Cr-Fe KOADSORPSI BY KITOSAN Endang Widjajanti; AK Prodjosantoso
Jurnal Penelitian Saintek Vol 13, No 1: April 2008
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (112.095 KB) | DOI: 10.21831/jps.v13i1.185

Abstract

This study aims to determine the ability of adsorption of chitosan on Cr (III) and Fe (III) ions simultaneously in various concentration variations. As research subject is chitosan isolated from crab shells and made through three stages namely deproteination stage, demineralisasi and deasetilasi. As the object of research is the adsorption power of chitosan against Cr (III) and Fe (III) metal ions, both for each ion and simultaneously. The adsorption process using a batch system is carried out for 24 hours at room temperature under optimum pH system conditions with a 1: 100 (w / v) adsorbent ratio at concentrations of 100 ppm to 1000 ppm. Chitosan adsorption is the ratio between the amount of metal ions adsorbed per gram of chitosan, adsorbat concentration is determined using Atomic Absorption Spectrophotometer The results showed that the adsorption capacity of chitosan on Fe (III) was stronger than Cr (III) in both single adsorption and simultaneous adsorption, and the process was classified as coadsorption.
NITROGEN ADSORPTION OF URINE WITH ZEOLITE M.Pranjoto Utomo; Endang Widjajanti; Kun Sri Budiasih
Jurnal Penelitian Saintek Vol 15, No 1: April 2010
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (6368.514 KB) | DOI: 10.21831/jps.v15i1.19168

Abstract

Tlte aints of the research v,ere to determine the nitrogen contained in humatt ttrine before and after ipplying zealyte ancl  to determine the influence o.f MgO to nitrog'n contained in human urine. The tJetermination ofZeolyte aclsorptio  capacity' to nitrogen contained in htrmqn trrine inclLtcled 3 s'teps. Activation ol' nature zeolf ie'nitrogen adsorptiort' Iotal nin"ogen determination Ly Kjeclahl test. Zeolyte activation wqs done by soaking zeollte itio0' 1 14 HCl, HNO: and H2soafor I hour and calcin(ltedJbr t hours at 100"c. The  adsorption proses  adding  y,as  clone byaicting inactivated ancl activated zeolyte tuithand without MgOThe iptimunt mass of zeolyte was 3 grants. The adsorption capacities oJ' inactivated zeolytes u,ithoutAnd with LttgO adcting were 0.00780994 and 0.0102% pq grdm zeolyte, respectivety. The adsorptionCapacities of activated zeoll'te by HCl, HNO: dan H:SO| wiihout Mgo addingw)re 0.00i01%,0.006610.4, and  0a0917?i,  per gram:eolil'te. Lhe adsorption capacities of activated zeolyle by HCl, HNO j dan H2SO| v'i* )IgO udding were 0.00839%,0.0i01%  dan 0.011% per gram zeoll'te. The activation and lulgO adr)ing increasecl the aclsorption capacitl' oJ' zeolyte to nitrogen contained in httman urine.
Kinerja Lalu Lintas Simpang Tak Bersinyal Perkotaan pada Lahan Terbatas (Studi Kasus : Simpang Jl. M. Kahfi II – Jl. Srengseng Sawah, Jakarta Selatan) Endang Widjajanti; Wileri Mandabi; Lely Mustika
SAINSTECH: JURNAL PENELITIAN DAN PENGKAJIAN SAINS DAN TEKNOLOGI Vol 32 No 4 (2022): Sainstech : Jurnal Penelitian dan Pengkajian Sains dan Teknologi
Publisher : Institut Sains dan Teknologi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37277/stch.v32i4.1470

Abstract

Abstract This study aims to determine the performance of the unsignalized intersection Jl. M. Kahfi II – Jl. Srengseng Sawah, South Jakarta. The analysis of the performance at unsignaled intersections refers to the guideline of the Indonesian Road Capacity Manual (MKJI), 1997. Data obtained through field surveys include geometric conditions, environmental conditions, and traffic conditions. The results of the analysis show that the peak hours of the working day in the morning period occur at 06.30 – 07.30 with a degree of saturation (DS) 1.10 with an intersection delay (D) of 25.16 sec/pcu and the afternoon period occurs at 18.00 – 19.00 with a degree of Saturation (DS) 0.93 with Intersection Delay (D) 16.39 sec/pcu. The results of the analysis for holidays show that the peak hours of the morning holiday period occur at 08.00 – 09.00 with a Degree of Saturation (DS) 0.71 with a Intersection Delay (D) 11.74 sec/pcu and the afternoon period occurs at 16.45 – 17.45 with a degree of saturation (DS) 0.85 with an intersection delay (D) of 14.31 sec/pcu. The results of this analysis indicate that the performance of the unsignalized intersection on Jl. M. Kahfi II – Jl. Srengseng Sawah South Jakarta is already in bad condition on weekdays and not good on holidays.. Increasing the capacity of Jalan Kahfi II in accordance with detailed spatial plans and zoning regulations in the Jagakarsa District, South Jakarta City in 2014, namely an increase in Jl. Kahfi II from Road Type 2/2 UD to 4/2D is very urgent to apply Keywords: traffic performance, urban, unsignalized intersection
Analisis Sistem Pengambilan Keputusan Penentuan Konstruksi Jalan dengan Perkerasan Kaku atau Fleksibel (Studi Kasus Jalan di Propinsi Maluku Utara) Rivolino Merbas; Endang Widjajanti; Syahril Taufik
SAINSTECH: JURNAL PENELITIAN DAN PENGKAJIAN SAINS DAN TEKNOLOGI Vol 33 No 1 (2023): Sainstech : Jurnal Penelitian dan Pengkajian Sains dan Teknologi
Publisher : Institut Sains dan Teknologi Nasional

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

Abstract

ABSTRACT This research discussing about decision support system analysis in determining concrete and composit road construction compared to asphalt construction for the case of roads in North Maluku Province. This study uses the Analytic Hierarchy Process (AHP) method or model as a method to analyze the feasibility of concrete and composit construction compared to asphalt construction. There are at least 7 (seven) factors that are considered as AHP inputs, namely road conditions, technical pavement, ecomonical/cost, duration/method of construction, availability of equipment, environmental conditions, and availability of materials. This study method includes data collection and analysis methods. For data collection, this study uses a questionnaire method that contains questions related to technical and non-technical factors that are used to assess the feasibility of a road for selecting a type of road pavement with flexible or rigid pavement. The construction feasibility of concrete and composite pavements is better than that of flexible asphalt pavements on road constructions, with the following sub-criteria conditions; roads that have bends and inclines, lower road maintenance costs, excellent weather and environmental resistance, less dense traffic, easy work execution and can be done at any time, do not require a lot of AMP and equipment, and asphalt availability can't fast time. The alternative of road pavement type is effective as a weight value of 33.78% with using the composite pavement construction. Keywords: Roadworthiness, Composite pavement, AHP, Decision Support System, North Maluku
Co-Authors AK Prodjosantoso Kun Sri Budiasih M.Pranjoto Utomo Mustika, Lely Rivolino Merbas Syahril Taufik Wileri Mandabi