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mulyani, wiwiek eka
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Chemistry Computer Science & IT Control & Systems Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Medicine & Pharmacology Public Health Transportation

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ANALISIS PENGARUH pH ALKALI TERHADAP KEKUATAN TARIK KAIN POLIESTER-KAPAS (65%-35%) PADA PENCELUPAN MENGGUNAKAN ZAT WARNA DISPERSI-REAKTIF Krystanto Simarmata, Wendian; Mulyani, Wiwiek Eka; Cahyaningtyas, Hilmi Amanah Aditya
Texere Vol 23, No 1 (2025): Texere Volume 23 Nomor 1 Tahun 2025
Publisher : Politeknik STTT Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53298/texere.v23i1.01

Abstract

Polyester-cotton fabric was dyed using disperse and reactive dyes. Dyeing of polyester using disperse dyes is commonly performed under acidic pH condition. However, reactive dyes dyeing process requires an alkaline pH condition so that the dye can be fixed on the cotton fiber. The usage of strong alkaline can cause erosion of the surface of the polyester fiber and result in a decrease in tensile strength. This research discusses about alkaline usage in the dyeing process of polyester-cotton fabric with disperse and reactive dyes to obtain good dyeing quality without reducing the tensile strength value of the fabric. The type of alkaline used was Na 2CO3 with concentration of 10 g/L (pH 11), 15 g/L (pH 12) and 20 g/L (pH 13). The dyeing process is carried out continuously using one bath two stages (1B2S). The characterization carried out on the dyeing samples were analyzed by tensile strength testing, color strength, color evenness using spectrophotometer, and color fastness to rubbing test. The results of the research showed the best condition under pH 12 with the usage of 15 g/L Na2CO3 had greater value of 39 kg for warp tensile strength, 28.08 kg for weft tensile strength, 12.69 of color strength, 1.17 of color evenness, color fastness to wet rubbing of 4 and color fastness to dry rubbing of 4-5.
MOTIF DETECTION IN INDONESIAN HAND-WOVEN FABRICS USING MATLAB Haryanto, Agung; Purnomosari, Endah; Mulyani, Wiwiek Eka; Abdullah, Fadil; Putra, Valentinus Galih Vidia; Kusrianto, Adi
Jurnal Inkofar Vol 9, No 1 (2025)
Publisher : Politeknik META Industri Cikarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46846/jurnalinkofar.v9i1.439

Abstract

In our study, we developed an automated system for identifying Indonesian woven fabric motifs using MATLAB-based image processing. Procedures included obtaining visuals, enhancing quality, constructing a regional dataset, extracting features, measuring similarity, and analyzing colors. Correlation assessments enabled precise motif identification, while tailored color analysis improved similarity accuracy. The algorithm demonstrated effective recognition performance using dataset references. This approach offers a practical solution for cultural preservation, providing faster and more consistent results than manual evaluation
Efektifitas Penggunaan pH Alkali Dalam Pencelupan Kain Kapas dengan Zat Warna Reaktif Monoklorotriazin Metode Perendaman Mulyani, Wiwiek Eka; Khoerunnisa, Izmie; Wardani, Lestari; Pudjiati, -; Pradana, Samuel Martin
Texere Vol 22, No 1 (2024): Texere Volume 22 Nomor 1 Tahun 2024
Publisher : Politeknik STTT Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53298/texere.v22i1.01

Abstract

Zat warna reaktif panas jenis monoclorotriazin merupakan zat warna yang memiliki sifat tidak tahan terhadap alkali. Namun, dalam proses pencelupan dengan zat warna reaktif memerlukan alkali untuk proses fiksasi agar zat warna dapat berikatan dengan serat.  Faktor yang berpengaruh pada proses fiksasi adalah penggunaan alkali dan pH larutan pencelupan. Dalam penelitian membahas mengenai pengaruh pH alkali pada larutan pencelupan zat warna monoclorotriazin (C.I Reactive Orange 13) untuk mendapatkan hasil pencelupan pada kain  kapas yang memiliki ketuaan dan kerataan warna, serta ketahanan warna terhadap pencucian yang baik (nilai 4-5). Alkali yang digunakan menggunakan alkali kuat (natrium hidroksida) dengan rentang pH 10, 10,5, 11, 11,5, dan 12. Metode pencelupan menggunakan metode perendaman pada suhu 80  selama 60 menit. Evaluasi ketuaan dan kerataan warna menggunakan spektrofotrometer dan laundry O meter untuk menganalisis ketahanan luntur warna terhadap pencucian. Hasil penelitian menunjukkan  penggunaan alkali berpengaruh terhadap ketuaan warna tetapi tidak berpengaruh terhadap kerataan dan ketahanan luntur warna. Hasil pencelupan optimum didapat pada pH 10.5 dengan nilai ketuaan warna (K/S) sebesar 2,94, nilai standar deviasi (kerataan warna) sebesar 0,01, nilai 5 pada  ketahanan luntur terhadap pencucian.    
A MATHEMATICAL MODEL OF GPS SATELLITE TIME AND FREQUENCY BASED ON THE SPECIAL THEORY OF RELATIVITY Purnomosari, Endah; Dewi, Siska Astari; Mulyani, Wiwiek Eka; Putra, Valentinus Galih Vidia; Abdullah, Fadil
Jurnal Inkofar Vol 9, No 2 (2025)
Publisher : Politeknik META Industri Cikarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46846/jurnalinkofar.v9i2.475

Abstract

The Global Positioning System (GPS) relies on highly precise atomic clocks in satellites and ground stations to determine global time and position accurately. Relativistic effects, including gravitational fields and satellite orbital motion, induce frequency shifts in these clocks, necessitating corrections for accurate navigation. This study developed a novel approach to integrate general coordinates into GPS, emphasizing implementation simplicity. We investigated the application of special relativity to calculate time and frequency shifts in GPS satellites. Our analysis estimated a daily relativistic correction of approximately 21.6 microseconds, with a positional imprecision of 6.48 km per day if uncorrected. By employing a general time-space coordinate system, we calculated position-4 and velocity-4 vectors, accounting for special relativistic effects on GPS time and frequency. The proposed method simplifies relativistic corrections while enhancing their conceptual clarity. Results demonstrate improved precision and efficiency in GPS positioning through the integration of general coordinates with a streamlined approach. This research offers valuable insights for international engineering communities, scholars, and practitioners, advancing the understanding of relativity’s impact on GPS satellite operations.
Co-Authors Cahyaningtyas, Hilmi Amanah Aditya Dewi, Siska Astari Fadil Abdullah Haryanto, Agung Khoerunnisa, Izmie Krystanto Simarmata, Wendian Kusrianto, Adi Pradana, Samuel Martin Pudjiati, - Purnomosari, Endah Putra, Valentinus Galih Vidia Wardani, Lestari