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All Journal Jurnal Sosio Ekonomika Bisnis Microbiology Indonesia Seminar Nasional Teknik Kimia Kejuangan Jurnal Zeolit Indonesia Jurnal RESTI (Rekayasa Sistem dan Teknologi Informasi) Neo Teknika: Jurnal Ilmiah Teknologi Journal of Data Science and Its Applications Jurnal SUBLIMAPSI CENDEKIA: Jurnal Ilmiah Pendidikan Jurnal Psikologi Terapan (JPT) Aceh International Journal of Science and Technology Jurnal Kendali Akuntansi Metalurgi

Widi Astuti

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Author-ID : 415342

Religion Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Nursing Public Health Social Sciences Other

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PENGETAHUAN MASYARAKAT TENTANG BARANG ELEKTRONIK BEKAS (E WASTE) DI KOTA SEMARANG Anief Rufiyanto; Widi Astuti
Neo Teknika Vol 3, No 2 (2017): Jurnal Neo Teknika Vol.3 No.2 Desember 2017
Publisher : Universitas Pandanaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37760/neoteknika.v3i2.1421

Indonesian is one of the largest consumers of home electronics in Asia. It is thereforeconceivable that in the next few years Indonesian will experience E-Waste booming. Thisdoes not include the amount of E-Waste entering Indonesian illegally from somedeveloped countries. From the results of a preliminary survey conducted by the BCRCSEA Jakarta in 2007, compared to other developing countries in Southeast Asia, peopleawareness towards the problems of E-Waste in Indonesian is relatively left behind. Thisstudy attempts to analyze public perceptions and behavior towards waste and the factorsthat influence waste management in Semarang. This study also tries to find out how muchthe public’s willingness to engage in recycling electronic waste. The findings showed thatpublic perception in Semarang toward E-Waste and its recycling considered low. Whilemost of respondents preferred to get service and reparation for their out of orderelectronics. Respondents argued that E-Waste recycling will merely benefit certainparties. It also due to respondents’ low knowledge on E-Waste and its recycling. Mostrespondents, however, stated that they were ready to participate in recycling E-Waste,with expenditure around Rp5,000,- up to Rp10,000,-. From the study results, demograficvariable influenced respondents’ perception and behavior, though it was insignificant.Whereas factors that shaped and influenced public’s willingness in Kota Semarang to beinvolved in E-Waste recycling was respondent’s assessment concerned to currentenvironmental condition, public perception and behavior toward E-Waste dan itsrecycling effort, the cost in carrying out E-Waste recycle process, and their knowledgeabout E-Waste and its recycle possibility.Key Word : E-Waste, recycle, perception and behavior, willingnes

Penggunaan Radiasi Gelombang Mikro dalam Sintesis Karbon Aktif dari Serbuk Kayu Randu dan Aplikasinya untuk Menjerap Methyl Violet Widi Astuti; Luluk Siti Zulaechah; Stefanus Lian Kristian; Dinda Tri Novira
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2017: PROSIDING SNTKK
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Randu based activated carbons were prepared using chemical activation by potassium hydroxide (KOH) and applied as a potential adsorbent for the adsorption of methyl violet dye in aqueous solution. The technique of heating during activation can affect the physical and chemical characteristics of activated carbon structure. Conventional and microwave heating techniques represent two different types of activation methods. In conventional heating, there is a thermal gradient from the hot surface of the adsorbent to its interior until steady state conditions are reached. To avoid the thermal gradient, the microwave heating technique was used. Scanning electron microscope (SEM), Fourier-transform infrared spectroscopy (FTIR) and N2 adsorption-desorption isotherm were used to study the morphology of adsorbent surface, surface chemical property and specific surface area-pore size distribution, respectively. Batch experiments were carried out to investigate the effect of pH, contact time and methyl violet concentration on sorption efficiency. The result shows that effective pH for methyl violet removal was 9. A greater amount of dye was removed with an increase in the initial concentration of dye and quasi-equilibrium reached in 180 min. The adsorption capacity of methyl violet dye by randu based activated carbon was 531.16 mg g-1.

MOTIVASI DAN PRODUKTIVITAS KERJA WANITA PEMETIK BUAH KOPI DI DESA SERDANG JAYA KECAMATAN BETARA KABUPATEN TANJUNG JABUNG BARAT Widi Astuti; Arsyad lubis; . Aprolita
Jurnal Ilmiah Sosio-Ekonomika Bisnis Vol. 18 No. 1 (2015): januari 2015
Publisher : Universitas Jambi

Penelitian ini bertujuan untuk melihat gambaran motivasi dan produktivitas kerja wanita sebagai pemetik buah kopi. Pemilihan tempat penelitian dilakukan secara sengaja (proposive) dengan pertimbangan bahwa Kecamatan Betara mempunyai lahan kopi terluas dibandingkan dengan Kecamatan lainnya. Pada kesempatan ini, yang akan diteliti yaitu peran wanita pada sektor publik yang bekerja sebagai pemetik buah kopi. Penelitian dilakukan dari tanggal 28 April 2014 sampai tanggal 28 Mei 2014, penentuan responden dilakukan dengan metode Accidental sampling (sampel aksidental). Daerah sampel penelitian yaitu Desa Serdang Jaya dengan pertimbangan di desa ini terdapat banyaknya jumlah wanita yang bekerja sebagai pemetik buah kopi. Dari hasil analisis statistik diperoleh χ2 hitung (6,43) > χ2 tabel (3,84), hal ini menunjukkan bahwa terdapat hubungan yang nyata antara motivasi wanita pemetik buah kopi dengan produktivitas kerja wanita pemetik buah kopi di Desa Serdang Jaya. Motivasi tersebut terdiri 3 indikator yaitu kebutuhan dasar, kebutuhan sosial, dan kebutuhan akan kemajuan. Analisis statistik indikator motivasi terhadap produktivitas kerja diperoleh : terdapat hubungan yang nyata pada indikator motivasi kebutuhan dasar (x2 hitung (10,72) > x2 tabel (3,84)) dan kebutuhan akan kemajuan (x2 hitung (4,37) > x2 tabel (3,84)) terhadap produktivitas kerja, sedangkan kebutuhan sosial (x2 hitung (0,741) > x2 tabel (3,84)) tidak terdapat hubungan yang nyata.Kata Kunci : Produktivitas Kerja, Tenaga Kerja Wanita, Motivasi.

BLEACHING OF CRUDE PALM OIL BY ADSORPTION METHOD WITH USING NATURAL ZEOLITE FROM LAMPUNG Widi Astuti; Muhammad Amin; Aprimal Aprimal
Jurnal Zeolit Indonesia Vol. 5 No. 2 (2006)
Publisher : Jurnal Zeolit Indonesia

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The research about bleaching of crude palm oil by adsorption method with using natural zeolite from Lampung has been done. The experiment result shows that natural zeolite from Lampung can be used as adsorbent for bleaching process of crude palm oil. Zeolite had been activated by chemical method with hydrochloric acid (HCl) solution before it was used as adsorbent. From the experiment result, we know that the best condition for bleaching process are weight percentage of zeolite that was used to get the highest of transmittance is 20% and the best concentration of HCl solution is 4%. The highest of transmittance for this condition is 48.5.

DESALINATION OF THE BRACKISH WATER USING SURFACTANT MODIFIED ZEOLITE (SMZ) Widi Astuti; Adil Jamali; Muhammad Amin
Jurnal Zeolit Indonesia Vol. 6 No. 1 (2007)
Publisher : Jurnal Zeolit Indonesia

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The intrusion of seawater in the beach area of Bandar Lampung and the Eastern beach of Lampung causes many problems for people because it turns the water into a brackish water. The brackish water is the water whose salinity is between 0.5 ppt until 17 ppt. The brackish water cannot be used for drinking, cooking or washing because the maximum degree of salinity for such purposes is 0.5 ppt. Desalination of brackish water is a process of reducing the salinity of a brackish water. In this research, natural zeolite from Lampung was modified with surfactant to become surfactant-modified zeolite (SMZ). It was used as ion exchanger in the desalination of a brackish water. The result showed the salinity of the brackish water could be reduced to 52% from the initial value. The best results were obtained at the contact time of 4 hours and the initial salinity 0.863 ppt.

Implementation of Enhance Confix Stripping Stemmer Algorithm for Multiclass Dataset Classification in News Text using K-Nearest Neighbor Alvianda Ricky Lukman; Widi Astuti
Journal of Data Science and Its Applications Vol 4 No 1 (2021): Journal of Data Science and Its Applications
Publisher : Telkom University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34818/jdsa.2021.4.76

Needs for news information has increased since the change from physical media to online media. News is grouped according to categories to making it easier for readers to get the news as desired. Grouping to determine the category of news information is known as text classification. The number of words in the news text create diversity of words that appear and can be minimized by the stemming process, which is changing an affixed word into its root word. This study comparing between use of stemming and without stemming and finding the best value of K and optimum distance calculation of K-Nearest Neighbor. The best accuracy is 0.9671 which is obtained when stemming algorithm not applied, number of K=9 and cosine distance is used as distance metric. This result is greater than the classification that applies stemming algorithm in condition K=7 using cosine distance which resulted accuracy in 0.9660.

Prediction of Retweets Based on User, Content, and Time Features Using EUSBoost Ghina Khoerunnisa; Jondri; Widi Astuti
Jurnal RESTI (Rekayasa Sistem dan Teknologi Informasi) Vol 6 No 3 (2022): Juni 2022
Publisher : Ikatan Ahli Informatika Indonesia (IAII)

Twitter is one of the popular microblogs that allow users to write posts. Retweeting is one of the mechanisms for the diffusion of information on Twitter. One way to understand the spread of information is to learn about retweet predictions. This study focuses on predicting retweets using Evolutionary Undersampling Boosting (EUSBoost) based on user, content, and time-based features. We also consider the vector of text as a predictive feature. Models with EUSBoost are able to outperform models using the AdaBoost method. The evaluation results show that the best model can achieve an AUC performance score of 77.21% and a GM score of 77.18%. While the Adaboost-based models achieved AUC scores ranging from 68% to 69% and GM scores ranging from 62% to 63%. In addition, we found that there was no significant difference between using numeric features only and combining numeric and text features.

Perbedaan Orientasi Masa Depan Terkait Pernikahan Pada Wanita Yang Bekerja Dan Wanita Tidak Bekerja Widi Astuti; Siska Siska; Rini Julistia
Jurnal Sublimapsi Vol 4, No 1 (2023): Jurnal Sublimapsi
Publisher : Jurusan Psikologi FKIP Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36709/sublimapsi.v4i1.35306

Penelitian ini bertujuan untuk mengetahui perbedaan orientasi masa depan terkait pernikahan pada wanita bekerja dan wanita tidak bekerja. Penelitian ini menggunakan pendekatan kuantitatif dengan jenis komparatif. Analisis yang digunakan dalam penelitian ini menggunakan uji-t untuk melihat apakah ada perbedaan orientasi masa depan terkait pernikahan pada wanita bekerja dan wanita tidak bekerja. Penelitian ini menggunakan teknik non probability sampling. Jumlah subjek dalam penelitian ini adalah tujuh ratus lima puluh lima orang wanita wanita bekerja dan wanita tidak bekerja. Hasil penelitian terdapat perbedan orientasi masa depan terkait pernikahan pada wanita bekerja dan wanita tidak bekerja dilihat berdasarkan hasil uji hipotesis 0,031. Terdapat selisih nilai yang terlihat ialah dimana wanita bekerja berkategori rendah sedangkan wanita tidak bekerja berkategori tinggi. Hal tersebut dikarenakan wanita bekerja walaupun sudah memiliki pasangan tetap saja menganggap pernikahan bukanlah prioritas utama dalam hidupnya. Sedangkan, Wanita tidak bekerja walaupun belum memiliki pasangan tetapi mereka sudah memiliki gambaran akan pernikahan nantinya.

GAMBARAN INTENSI MENYONTEK PADA MAHASISWA DI UNIVERSITAS X Rini Julistia; Yuliyana Yuliana; Yara Andita Anastasya; Ika Amalia; Rahmia Dewi; Widi Astuti
Jurnal Psikologi Terapan Vol 5, No 2 (2022)
Publisher : Program Studi Psikologi Fakultas Kedokteran Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/jpt.v5i2.9543

Penelitian ini bertujuan untuk mengetahui gambaran intensi menyontek pada mahasiswa di Universitas X. Penelitian ini merupakan deskriptif kuantitatif. Subjek penelitian yaitu mahasiswa aktif di Universitas X dari tahun 2016 sampai 2020 berjumlah 205 subjek. Teknik pengumpulan data menggunakan kuesioner. Uji instrumen yang digunakan adalah uji validitas dengan teknik corrected item-total correlation dan uji reliabilitas menggunakan teknik Alpha Cronbach. Teknik analisis data yang digunakan dalam penelitian ini adalah deskriptif. Hasil penelitian menunjukkan bahwa intensi menyontek pada mahasiswa di Universitas X berada pada kategori negatif. Hal ini memiliki makna bahwa mahasiswa di Universitas X, memiliki attitudes toward the bahavioral yang negatif dimana mahasiswa menilai perilaku menyontek merupakan perbuatan yang tidak baik. Kemudian subjective norm yang dipandang negatif, membuat mahasiswa merasakan tekanan sosial untuk menghindari perilaku menyontek. Ketika attitudes toward the bahavioral dan subjective norm dinilai negatif maka perceived behavioral control yang dirasakan akan kecil, sehingga intensi untuk melakukan menyontek akan negatif. Saran untuk peneliti selanjutnya dapat menggunakan metode kuantitatif dua variabel dan dapat menambah variabel kontrol diri dalam fenomena menyontek yang terjadi di mahasiswa.

ZnO Production from EAF Solid Waste Using Hydrothermal Methods via Oxalate Precipitation Lukman Nulhakim; Imam Prasetyo; Monna Rozana; Widi Astuti
Aceh International Journal of Science and Technology Vol 12, No 1 (2023): April 2023
Publisher : Graduate Program of Syiah Kuala University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/aijst.12.1.29579

Electric Arc Furnace (EAF) waste contains 50-60% Zn. EAF waste synthesis has the potential to produce ZnO, which can be used in a variety of applications. The hydrothermal method is used in the synthesis, with time variations of 3 and 6 hours and temperature variations of 120 °C, 150 °C and 200 °C using precipitating reagents in the form of sodium hydroxide (NaOH) and oxalic acid (C2H2O4). UV-Vis spectrophotometer characterization result shows the absorbance value at 365 nm, which is the absorbance characteristic of ZnO material. The result of increasing the Zn element was revealed by XRF characterization. The XRD characterization revealed zinc oxalate dehydrates. This result depicts the hydrothermal with the oxalic acid solvent used to produce zinc oxalate dehydration at various temperatures and time variations.

Co-Authors Achmad Sofi Adil Jamali Adiwijaya Agus Hidayatullah Agustien Zulaidah Agustin, Niyar Candra Alvianda Ricky Lukman anggi solihah Anief Rufiyanto Aprimal Aprimal Apriyanti, Eny Aprolita Aprolita Ardyanto Wijaya Arsyad Lubis Ayu Septriana Azhar Azhar Baswindro Baswindro Cahya Novita Danu Bratakusuma Dinda Tri Novira Edy Sanwani Eko Wahyuni Fajar Nurjaman Fika Rofiek Mufakhir Ghina Khoerunnisa Halimatul Husni Hendrik Setiawan Himawan Tri Bayu Murti Petrus Ika Amalia Imam Prasetyo January Jefry Prasetya Jondri Kasman Kasman Laksono Trisnantoro Lukman Nulhakim Luluk Siti Zulaechah Monna Rozana Muhammad Amin Mujiono Mujiono Nuslia Bayangkara Lamandhi Rahmia Dewi Rini Julistia Riska Chairunisa Siska Siska SITI KHODIJAH CHAERUN Soehartono Soehartono Stefanus Lian Kristian Sukaryo Sukaryo Wiratni Wiratni Yara Andita Anastasya Yuliyana Yuliana Yustika Kusumawardani Yustika Kusumawardani Yustika Kusumawardani

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