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All Journal Jurnal Harkat : Media Komunikasi Gender JURNAL INTEGRASI PROSES Teknika: Jurnal Sains dan Teknologi Journal Industrial Servicess Jurnal Kimia Mulawarman JPSE (Journal of Physical Science and Engineering) Jurnal Metalurgi dan Material Indonesia Journal of Community Service in Science and Engineering

Tri Partuti

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Author-ID : 1527655

Arts Astronomy Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Public Health Transportation Other

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Analisa Kimia dan Pengujian Tarik Pada Sampel Pipa Casing Sesuai Standar API 5CT Grade H40 Dwiyanti, Yanyan; Partuti, Tri
Journal Industrial Servicess Vol 2, No 2 (2017): Maret 2017
Publisher : Fakultas Teknik Jurusan Teknik Industri Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/jiss.v2i2.1562

Penelitian ini dilakukan untuk menguji sampel casing pipa baja dengan ukuran 406,40 mm OD x 9,53 mm WT, apakah sudah sesuai dengan standar API 5CT Grade H40. Pengujian yang dilakukan adalah analisa kimia dengan standar ASTM A751 menggunakan instrumen spektrofotometer dan uji tarik berdasarkan satandar ASTM A370 dengan lokasi uji tarik transeverse to pipe axis dan transverse weld. Hasil analisa komposisi kimia menunjukkan kandungan P (pospor) sebesar 0,0102 wt% dan S (sulfur) sebesar 0,0069 wt% (standar API 5CT Grade H40, P max = S max = 0,030 wt%). Dari pengujian tarik didapat hasil nilai yield strength sebesar 364,68 MPa (standar API 5CT Grade H40 = 276 – 552 MPa) dan tensile strength sebesar 466,28 MPa (standar API 5CT Grade H40 min = 414 MPa). Hasil percobaan menunjukkan bahwa sampel casing pipa baja sudah memenuhi syarat dalam standar API 5CT Grade H40

Pengaruh Temperatur Proses Curing Terhadap Sifat Thermal Komposit Epoksi Berpengisi Nanopartikel Sn-3.5Ag Tri Partuti; Yanyan Dwiyanti; Adhitya Trenggono; Fuji Utari
Jurnal Metalurgi dan Material Indonesia Vol. 2 No. 1 (2019): April
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Electrically Conductive Adhesive (ECA) is an alternative solder substitute that does not contain Pb. In this research, we made nanocomposite from epoxy resin as matrix and Sn-3.5Ag nanoparticle as filler to determine the nanocomposite thermal properties for ECA applications. We used curing process temperature variations of 30, 65 and 95 oC with sonication for 30 minutes. Differential Scanning Calorimetry (DSC) analysis showed an increase of glass transition temperature (Tg) and degradation temperature (Td), decreasing curing temperature (Tcuring) as the curing process temperature increased while the melting temperature (Tm) and crystallization temperature (Tc) tend to be constant. Tg for curing process 30, 65 and 95 oC was 35.58; 37.41 and 43.77 oC respectively. Td for curing process 30, 65 and 95 oC was 335.01; 337.50 and 342.49 oC. Tcuring in the curing process 30 and 65 oC was 179.95 and 176.08 oC. Thermogravimetric Analysis (TGA) showed that nanocomposite Td between 330-340 oC.

KAJIAN EKSTRAKSI BIJIH NIKEL LIMONIT BULI DENGAN ASAM SULFAT DAN KARAKTERISASI RESIDU HASIL EKSTRAKSI Tri Partuti; Johny Wahyuadi Soedarsono
Jurnal Teknika Vol 10, No 2 (2014): Edisi November 2014
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/tjst.v10i2.6663

Ekstraksi bijih nikel limonit untuk mendapatkan kondisi optimum ekstraksi telah dilakukan. Karakterisasi bijih nikel limonit dari daerah Buli, Halmahera menunjukkan deposit termasuk jenis oksida. Unsur nikel ditemukan bergabung dengan magnesium silikat dalam fasa liebenbergite (7,67 wt%). Ekstraksi dengan asam sulfat dilakukan pada temperature 60oC selama 4 jam. Kondisi optimum untuk ekstraksi bijih nikel limonit Buli adalah dengan ukuran partikel -100#, konsentrasi asam sulfat 30 vol%, volume asam sulfat sebanyak 200 ml dan pH filtrat pada kondisi asam (pH=2). Dengan volume asam sulfat sebanyak 200 ml, dapat mengekstraksi nikel sebesar 18,64% untuk 100 gram bijih limonit. Unsur nikel tidak ditemukan dalam residu hasil ekstraksi. Residu hasil ekstraksi mengandung fasa goethite (59,84 wt%), melanterite (22,99 wt%) dan kuarsa (17,17 wt%).

Sintesis dan karakterisasi grafena oksida dari tempurung kelapa dengan metode sonikasi dan hidrotermal Mohamad Bima Putera Honorisal; Nurul Huda; Tri Partuti; Amalia Sholehah
Jurnal Teknika Vol 16, No 1 (2020): Edisi Juni 2020
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/tjst.v16i1.7519

Tempurung kelapa termasuk sampah organik, sehingga dapat digunakan sebagai sumber karbon alternatif. Grafit merupakan salah satu alotrop karbon yang memiliki struktur mirip sarang lebah yang terdiri dari banyak lapisan, sedangkan grafena hanya memiliki satu lapisan karbon. Untuk mensintesis grafena dapat menggunakan metode sonikasi dengan ukuran partikel grafit +200#, -200+230#, dan -230# serta waktu proses selama 30 dan 60 menit. Grafit didapatkan dari arang tempurung kelapa yang berwarna coklat dan berasal dari perkebunan kelapa di Banten. Setelah proses sonikasi, grafit masuk ke proses hidrotermal dengan dan tanpa gas nitrogen. Grafena oksida yang dihasilkan dikarakterisasi menggunakan Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), dan scanning electron microscopy (SEM). Berdasarkan hasil XRD, sampel yang telah sonikasi masih berbentuk grafit oksida. Hal ini didukung dengan hasil SEM yang memiliki morfologi yang berpori dan belum transparan serta tidak terdeteksinya titik 2D pada karakterisasi Raman. Pada karakterisasi FTIR, terdapat ikatan C=C. Berdasarkan karakterisasi Raman, sampel GV 24 menunjukan rasio iD/iG sebesar 0,84. Pada karakterisasi FTIR terdeteksi ikatan O-H, ikatan C-H, dan ikatan C=C. Morfologi permukaan terlihat lebih transparan dari grafit yang telah disonikasi. Berdasarkan karakterisasi Raman, sampel GH 4 menunjukan rasio iD/iG sebesar 0,84. Pada karakterisasi FTIR terdeteksi ikatan O-H, ikatan C=C, dan ikatan C-O. Morfologi permukaan lebih transparan yang menandakan bahwa grafit telah terkelupas. Hasil penelitian menunjukan bahwa semakin lama proses sonikasi dan ukuran partikel -200# +230# menciptakan lapisan yang transparan dan tipis serta menghasilkan grafena oksida setelah melalui proses hidrotermal. Coconut shell is an organic waste and can be used as an alternative carbon source. Graphite is one of the carbon allotropes which has a honeycomb-like structure consisting of many layers, whereas graphene has only single carbon layer. To synthesize graphene, sonication method used by using graphite particle size +200#, -200# +230# and -230#, and processing time of 30 and 60 minutes. Graphite was obtained from brown coconut shell charcoal and comes from coconut plantations in Banten. After the sonication process, graphite processed by hydrothermal method with and without nitrogen gas. Characterization of graphene oxide was done by Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Based on the XRD results, the sonicated sample is still in the form of graphite oxide. This is supported by SEM results that have porous morphology and are not transparent and 2D peaks are not detected in Raman characterization. In FTIR characterization, there is a C=C bond. Based on Raman characterization, the GV 24 sample shows an iD/iG ratio of 0.84. In FTIR characterization O-H bonds, C-H bonds, and C=C bonds were detected. Surface morphology looks more transparent than graphite that has been sonicated. Based on Raman characterization, the GH 4 sample shows an iD / iG ratio of 0.84. In FTIR characterization O-H bonds, C=C bonds, and C-O bonds were detected. The surface morphology is more transparent which indicates that the graphite has been peeled off. The results showed that the longer the sonication process and particle size -200# +230# creates a transparent and thin layer and produces graphene oxide after going through the hydrothermal process.

Characteristics of mangosteen rind peel off gel mask with various concentrations Tri Partuti; Priyanti Priyanti; Hutssy Elya Nadyana; Alika Arum Daniya
Jurnal Teknika Vol 17, No 1 (2021): Available Online in June 2021
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/tjst.v17i1.10401

Judul: Karakteristik masker gel peel off kulit buah manggis (Garcinia mangostana L.) dengan berbagai konsentrasi Title: Characteristics of mangosteen rind peel-off gel mask (Garcinia mangostana L.) with various concentrationsManggis (Garcinia mangostana L.) merupakan tanaman yang memiliki buah berwarna merah keunguan yang terdiri atas daging buah dan kulit buah. Kulit buah mengandung senyawa antioksidan yang diperlukan dalam peremajaan kulit wajah pada produk kosmetik seperti masker gel peel-off. Penelitian ini bertujuan untuk mengetahui konsentrasi terbaik ekstrak kulit buah manggis untuk masker gel peel-off. Penelitian terdiri dari dua tahap, yaitu pembuatan ekstrak kulit buah manggis dan masker gel peel off. Kulit buah manggis yang berbentuk serbuk direndam dalam larutan etanol 96% dengan perbandingan 1:5 selama 24 jam kemudian disaring. Larutan diekstraksi dengan metode maserasi kemudian diuapkan menggunakan rotary evaporator. Aktivitas antioksidan yang dilakukan menggunakan metode DPPH. Masker gel peel-off terdiri atas bahan PVA (polivinil alkohol), HPMC (hydroxypropyl methylcellulose), methylparaben, propylene paraben, dan propylene glycol dengan penambahan ekstrak kulit buah manggis sebesar 10g (F1), 20g (F2), dan 40g (F3). Hasil penelitian menunjukkan bahwa nilai IC50 yang didapat sebesar 7,33 ppm. Semua pengobatan memiliki pH antara 5,98-6,41 yang sesuai dengan SNI tahun 1996 untuk kulit wajah. Viskositas masker gel peel off pada semua perlakuan berkisar antara 11606-23012,5 cps dan sesuai dengan SNI tahun 1996. Waktu pengeringan masker memerlukan waktu antara 29-38 menit. Masker gel peel-off terbaik adalah perlakuan F3 dibandingkan dengan perlakuan F1 dan F2 dalam waktu lama. Penambahan ekstrak kulit buah manggis pada sediaan masker gel peel-off memiliki kemampuan antioksidan yang sangat kuat dan sesuai SNI tahun 1996 pada pH dan viskositas. Mangosteen (Garcinia mangostana L.) is a plant that has purplish-red fruit consisting of fruit flesh and fruit skin. The fruit's skin contains antioxidant compounds needed in facial skin rejuvenation in cosmetic products such as peel-off gel masks. This study aims to determine the best concentration of mangosteen rind extract for peel-off gel masks. The research consisted of two stages: the manufacture of mangosteen rind extract and peel-off gel mask. Mangosteen rind in powder form was soaked in 96% ethanol solution in a ratio of 1:5 for 24 hours and then filtered. The solution was extracted by the maceration method and then evaporated using a rotary evaporator. Antioxidant activity was carried out using the DPPH method. The peel-off gel mask consists of PVA (polyvinyl alcohol), HPMC (hydroxypropyl methylcellulose), methylparaben, propylene paraben, and propylene glycol with the addition of mangosteen rind extract of 10g (F1), 20g (F2), and 40g (F3). The results showed that the IC50 value obtained was 7.33 ppm. All treatments had a pH between 5.98-6.41 which was following the 1996 SNI for facial skin. The viscosity of the peel-off gel mask in all treatments ranged from 11606-23012.5 cps and was following SNI 1996. The drying time of the mask took between 29-38 minutes. The best peel-off gel mask was the F3 treatment compared to the F1 and F2 treatments for a long time. The addition of mangosteen rind extract to the peel-off gel mask preparation has a powerful antioxidant ability following SNI 1996 on pH and viscosity.

PENGARUH PROGRAM BANK SAMPAH TERHADAP TINGKAT PENDAPATAN KELUARGA NASABAH BANK SAMPAH MANDIRI DI KELURAHAN KEBONSARI Ani Umyati; Yanyan Dwiyanti; Tri Partuti
Journal Industrial Servicess Vol 4, No 1 (2018): Oktober 2018
Publisher : Fakultas Teknik Jurusan Teknik Industri Universitas Sultan Ageng Tirtayasa

This research is a qualitative and quantitative research that aims to find out and analyze the influence of waste bank program on the income of customers Mandiri Garbage Bank in Kebonsari Village, Citangkil District, Cilegon City. The population were 50 customers of Mandiri Garbage Bank, consisting of administrators (9 people), active members (15 people) and non-active members (26 people). Data collection methods used are questionnaires, observation, documentation and interviews. Data was analysed with linearregression formula. It’s obtained the value of the bank's waste program (X) in 1 unit, it will cause a decreasein the value of the customer's family income (Y) which is 0.287 per unit. Hypothesis approvened by using the t test, and the result is no influence of the waste bank program variables on the variable income level of the customer family of Mandiri Garbage Bank in Kebonsari Village, Citangkil District, Cilegon City. This is evident from the value of t count (-1,981) <t table (2,012).

PENENTUAN KONDISI OPTIMUM PENGENDAPAN LIMBAH TAILING HASIL PENAMBANGAN EMAS DI DAERAH CIBALIUNG Tri Partuti; Yanyan Dwiyanti
Journal Industrial Servicess Vol 3, No 1a (2017): Oktober 2017
Publisher : Fakultas Teknik Jurusan Teknik Industri Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/jiss.v3i1a.2068

Penentuan kondisi optimum pengendapan limbah tailing hasil penambangan emas di daerah Cibaliung telah dilakukan secara kimiawi (koagulasi-flokulasi), dengan parameter dosis koagulan (5,13 dan 10,26 ml), flokulan (2,56; 5,13; 10,26 dan 20,52 ml), kondisi pH slurry (6,5; 7,0; 7,5; 8,0; 8,5; 9,0; 9,5; 10,0 dan 10,5) serta fraksi/ukuran partikel (+100#; -100 +140#; -140 +200#; dan -200 +325#). Tailings thickening merupakan tahap awal pengolahan limbah untuk memisahkan dan mengendapkan partikel solid (slurry) yang terkandung dalam tailings sehingga mengendap di dasar tanki. Penelitian menggunakan alat Jar-Test, volume slurry 1000 ml, untuk mengatur kondisi keasaman slurry ditambahkan HCl 32%, kondisi pH awal slurry 10 dan 37% solid, saat penambahan koagulan dilakukan pengadukan selama 2 menit dengan kecepatan 145 rpm, untuk flokulan selama 5 menit dengan kecepatan 60 rpm. Endapan yang diperoleh dinyatakan dalam total padatan tersuspensi atau Total Suspended Solid (TSS). Koagulan yang digunakan adalah polyaluminium chloride (PAC) 100 ppm, sedangkan flokulan yang digunakan adalah poliakril amida (PAA) 100 ppm. Semakin banyak koagulan dan flokulan yang ditambahkan maka konsentrasi TSS semakin menurun. Kondisi optimum pengendapan adalah pada pH 8 dengan 10,26 ml koagulan PAC 100 ppm (TSS = 368 ppm) dan 20,52 ml flokulan 100 ppm (TSS = 1177 ppm). Semakin besar fraksi massa tertahan (ukuran partikel koloid semakin kecil) maka terdapat banyak partikel halus yang tidak dapat tertangkap oleh flokulan yaitu pada fraksi -325#.

Ekstrak Etanol Kulit Buah Manggis Sebagai Masker Gel Peel-Off Berantioksidan Priyanti Priyanti; Tri Partuti; Nusaibah Nur Amalina; Desy Rahmiaty; Wulandari Fera Yanti; Hutssy Elya Nadyana; Alika Arum Daniya; Nurul Annisa; Azza Hanif Harisna
JURNAL KIMIA MULAWARMAN Vol 18 No 2 (2021)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/jkm.v18i2.922

Peel off gel masks have become a trend in the field of beauty as a facial skin care. Utilization of mangosteen rind extract is thought to be able to provide more function on the mask as its high levels of antioxidant. This study discusses the optimum formulation of antioxidant peel off gel mask with mangosteen rind ethanol extract. Mangosteen rind was obtained from the market in the South Tangerang area and then extracted using 96% ethanol as the solvent by maceration. Peel off gel mask preparation is formulated with extract concentrations of 1%, 2% and 4%. Stability test in the form of analysis of pH, viscosity, dry time, and homogenation was carried out for four weeks. Antioxidant analysis was carried out to detect flavonoid, saponins and tannins. The results showed that the extract contained flavonoids, saponins and tannins with free radical scavenging values of 16.10%. The optimum formulation of peel off gel mask is with 2% extract because it has an acidic pH, a viscosity value of 8025 cps, a thick texture, and has a drying time of about 14 minutes.

HUBUNGAN ANTARA STATUS GIZI DENGAN PRODUKTIVITAS TENAGA KERJA WANITA IKM GIPANG WILAYAH CILEGON Tri Partuti
Jurnal Harkat : Media Komunikasi Gender JURNAL HARKAT : MEDIA KOMUNIKASI GENDER, 15(2), 2019
Publisher : Pusat Studi Gender dan Anak (PSGA), Universitas Islam Negeri Syarif Hidayatullah

Abstract. Work productivity is a concept that shows the relationship between work results and the unit of time needed to produce the product. A worker is said to be productive if he is able to produce more output than other workers for the same unit of time. Work productivity is influenced by several factors, including gender, age, health status / nutritional status, biological disorders of the female workforce, education, years of service and disruption in the work environment. A study of women has been carried out in a number of Gipang Small and Medium Industries (IKM) in the Cilegon area, Banten to determine the relationship between the nutritional status of female workers on the productivity of their work in making gipang (a typical Banten food made from sticky rice mixed with sugar water). The number of respondents as many as 40 people with criteria for female workers aged 20-45 years with healthy conditions, no menstruation, not pregnant, not in the puerperium and menopause, have worked to make gipang at least 2 years and at least educated at the level of junior / equivalent. Data analysis was performed using the statistical regression analysis method. The results of data processing showed that Fcount <Ftable (0.362 <0.55) showed that the nutritional value or Body Mass Index (BMI) did not significantly influence the productivity of female workers in GIPang Gipang. The p-value (Significance F) = 0.55 indicates that height and weight did not significantly influence the nutritional value of female workers. Tcount <ttable also shows that nutritional status does not have a significant effect on work productivity.Abstrak. Produktivitas kerja adalah suatu konsep yang menunjukkan adanya kaitan antara hasil kerja dengan satuan waktu yang dibutuhkan untuk menghasilkan produk. Seorang tenaga kerja dikatakan produktif jika ia mampu menghasilkan keluaran (output) yang lebih banyak dari tenaga kerja lain untuk satuan waktu yang sama. Produktivitas kerja dipengaruhi oleh beberapa faktor, diantaranya adalah jenis kelamin, usia, status kesehatan/status gizi, gangguan biologis tenaga kerja wanita, pendidikan, masa kerja dan gangguan di lingkungan kerja. Telah dilakukan penelitian kajian wanita di beberapa Industri Kecil Menengah (IKM) gipang di daerah Cilegon, Banten untuk mengetahui hubungan antara status gizi pekerja wanita terhadap produktivitas kerjanya dalam membuat gipang (makanan khas daerah Banten yang terbuat dari ketan dicampur dengan air gula). Jumlah responden sebanyak 40 orang dengan kriteria tenaga kerja wanita usia 20-45 tahun dengan kondisi sehat, tidak mengalami menstruasi, tidak hamil, tidak dalam masa nifas dan menopouse, telah bekerja membuat gipang minimal 2 tahun dan minimal berpendidikan setingkat SLTP/sederajat. Analisa data dilakukan dengan metode analisis statistik regresi. Hasil pengolahan data didapatkan Fhitung < Ftabel (0,362 < 0,55) menunjukkan bahwa nilai gizi atau Indeks Masa Tubuh (IMT) tidak berpengaruh secara signifikan terhadap produktivitas pekerja wanita pada IKM gipang. Nilai p-value (Significance F) = 0,55 menunjukkan bahwa tinggi badan dan berat badan tidak berpengaruh secara signifikan terhadap nilai gizi pekerja wanita. Nilai thitung < ttabel juga menunjukkan bahwa status gizi tidak memiliki pengaruh yang signifikan terhadap produktivitas kerja.

Effect of Fibre Volume Fraction and Sodium Hydroxide Treatment on Mechanical Properties of Palm Fibre/Unsaturated Polyester Composite Tri Partuti; Umar Hamzah Fariyan; Yanyan Dwiyanti; Adhitya Trenggono; Erlina Yustanti
JPSE (Journal of Physical Science and Engineering) Vol 7, No 1 (2022): JPSE (Journal of Physical Science and Engineering)
Publisher : Universitas Negeri Malang

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

Wood has some weaknesses, such as susceptibility to weathering, easily attacked by termites, and low water resistance. An alternative material such as Natural Fibre-Reinforced Polymer (NFRP) composite should overcome those weaknesses. This research aims to make a composite with palm fibre and unsaturated polyester resin. Palm fibres immerse for 2 hours in NaOH solution with varying concentrations of 3%, 5%, and 7%. The volume fraction of palm fibre are 0%, 5%, 10%, 15%, and 20%. Woven roving fibreglass was added to compare the tensile strength of composite with or without natural fibre. The density of composites increased with the increase of fibre volume fraction. The highest tensile strength was obtained for 15% of fibre volume fraction, namely 23.8483 MPa. In contrast, the highest compressive strength was obtained for 5% of fibre volume fraction, namely 94.76 MPa. NaOH removed the impurities and waxy substances from the fibre surface and created a rougher surface topography after alkalization. The highest tensile strength was obtained with 7% NaOH, namely 14.674 MPa. The highest water absorption value was obtained at 3% NaOH concentration and 15% of fibre volume fraction, namely 1.445%. The addition of woven roving as reinforcement to natural fibre composite can increase tensile strength by 210%, from 13.882 MPa to 43.123 MPa.DOI: 10.17977/um024v7i12022p039

Co-Authors Adhitya Trenggono Adhitya Trenggono Aditya Trenggono Alika Arum Daniya Alika Arum Daniya Ani Umyati Aziz, Abdul Azza Hanif Harisna Bening Nurul Hidayah Kambuna Desy Rahmiaty Dwiyanti, Yanyan Erlina Yustanti Fuji Utari Hutssy Elya Nadyana Hutssy Elya Nadyana Indah Uswatun Hasanah Johny Wahyuadi Soedarsono M. Fitrullah Mohamad Bima Putera Honorisal Nurul Annisa Nurul Huda Nusaibah Nur Amalina Priyanti Priyanti Sholehah, Amalia Umar Hamzah Fariyan Wulandari Fera Yanti Yanyan Dwiyanti Yanyan Dwiyanti

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