29 research outputs found
Studi Kinetika Fotokatalisis Zat Warna Metilen Biru oleh Seng Oksida (ZnO) di Bawah Penyinaran Lampu UV-LED
No full textStudi kinetika fotokatalisis zat warna metilen biru oleh seng oksida (ZnO) dilakukan di bawah penyinaran lampu UV-LED. Seng oksida (ZnO) yang digunakan disintesis dengan metode kopresipitasi. Seng oksida (ZnO) dikarakterisasi dengan difraksi sinar-X, FESEM, dan adsorpsi-desorpsi N2. Hasil karakterisasi menunjukkan bahwa seng oksida (ZnO) memiliki struktur kristal heksagonal, ukuran partikel dari 0,125-3 µm, luas permukaan spesifik (SBET), volume pori meso, dan volume pori mikro masing-masing sebesar 60,20 m2/g, 0,541 cm3/g, dan 0,02 cm3/g. Kinetika reaksi fotokatalisis metilen biru mengikuti hukum laju reaksi orde satu. Analisis kinetika Langmuir-Hinshelwood menghasilkan nilai konstanta reaksi fotokatalisis (kr) dan konstanta Langmuir-Hinshelwood masing-masing sebesar 2,2621 L.mg-1.menit-1 dan 0,0144 L.mg-1.
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Kinetic study on photocatalytic methylene blue dye by zinc oxide (ZnO) was carried out under UV-LED lamp irradiation. Zinc oxide (ZnO) was prepared by coprecipitation method. Zinc oxide (ZnO) was charaterized by x-ray diffraction, FESEM, and N2 adsorption-desoprtion. Characterization result show that zinc oxide (ZnO) have hexagonal crystal structure, particle size value between 0,125- 3 µm, spesific surface area (SBET), micropore volume, and mesopore volume are 60,20 m2/g, 0,541 cm3/g, and 0,02 cm3/g, respectively. The photocatalytic of methylene blue reaction kinetic follow the first orde rate law. The Langmuir-Hisnhelwood kinetic analysis result shown that photocatalytic reaction constant and Langmuir-Hinshelwood constant value are 2,2621 L.mg-1.minute-1 dan 0,0144 L.mg-1, respectively
Kinetic study of methylene blue photocatalytic decolorization using zinc oxide under UV-LED irradiation
No full textEsterification of palm fatty acid distillate with epychlorohydrin using cation exchange resin catalyst
No full textPengurangan kandungan Fe dalam lempung kaolit menggunakan asam Fluorida.
No full textPenggunaan produk-produk hasil industri keramik semakin banyak diminati. Salah satu bahan baku industri keramik adalah lempung jenis kaolinit yang banyak
terdapat di daerah Plered Purwokerto. Agar dapat
digunakan sebagai bahan baku industri keramik halus, maka
kandungan Fe dalam lempung kaolinit tidak boleh lebih
_ dari 2 %. Oleh sebab itu kandungan Fe dalam lempung kaolinit dikurangi.
Senyawa. Fe yang terdapat dalam lempung kaolinit berbentuk Fe,O- dapat berkurang dengan oara di rendam ke dalam larutan HF. Dengan memvariasi konsentrasi HF dan waktu kontak, maka akan didaratkan pengurangan Fe dalam kao.linitmenoapai optimal.
Dari hasil analisa dengan AAS kandungan Fe dalam kaolinit sebelum perlakuan dengan HF adalah 12,795 %. Pengurangan optimal Fe dalam kaolinit oleh HF 1 7 M dan 'waktu kontak 90 menit adalah 11,44 %. Sehingga kadar Fe dalam kaolinit setelah perlakuan dengan HF menjadi 1,355%
Dari hasil penelitian ini dapat disimpulkan bahwa penggunaan HF oukup efektif. Many products ceramic industry more and more interesting. One of raw materials of ceramic industry is caolinit clay, it was found in Plered Purwokerto. So that a benefit of raw materials as polished ceramic industry, Fe content in the caolinit clay may not be more than 2 %. Due to that reason the content of Fe caolinit clay should be reduced.
Fe compound that found in caolinit clay as Fe2O3. could be reduced by HF. By variation of HF concentration and contact time optimal content of Fe was able to find.
From analysis by AAS, Fe content of caolinit clay before treatment with HF was 12,795 %. The optimal reduction of Fe in caolinit clay by HF 7 M and contact time for 90 minutes was 11,44 %. So Fe content of caolinit clay after treatment with HF was 1,355 %.
It is able to conclude that HF is effective agent for reduce the Fe content.
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Electron-transfer-induced metallic electronic states in a H/Fe3O4(001) film subsurface
No full textWe investigate the local electronic properties of Fe atoms in a H/Fe3O4(001) film subsurface using scanning tunneling microscopy/spectroscopy (STS). Local barrier height measurements show a H-adsorption-induced reduction of the local work function, indicating electron transfer from H to surface atoms. The STS results and high-resolution spatial mapping of the occupied density of states near the Fermi level reveal that subsurface Fe atoms located beneath a OH group exhibit a metallic electronic state, different from the semiconducting state for intrinsic subsurface Fe atoms. These results can be explained by considering the extension of electron transfer to the subsurface layer. (c) 2019 The Japan Society of Applied Physic
PERANCANGAN APLIKASI E-COMMERCE DENGAN MENGGUNAKAN WORDPRESS SEBAGAI UPAYA MENINGKATKAN PENGEMBANGAN USAHA DI BIDANG PEMASARAN
No full textJika membutuhkan abstrak atau isi jurnal silahkan menghubungi author melalui email [email protected], [email protected], [email protected] Terima kasi
Struktur Naskah Drama Matahari Setengah Mati Karya Agus Rego Subagyo
No full textThis study aims to describe the character elements, roles, characters, events, motifs, plots, conflicts, settings, language cultivation, themes, and mandates contained in the drama script of Matahari Half Mati. This type of research uses qualitative research with descriptive methods. The results showed that this drama script has seven symbolic figures. These characters have their own roles and characters. This drama script with the theme of family life without a leader does not have a purposeful goal. Many problems arise in the family. The messages that can be taken from this drama script are: a) the importance of education in order to become an intelligent person and have broad insight. b) don't be a leader who doesn't care about the fate of the little people. c) do not be a man who can not restrain his lust. This drama script does not have a clear conflict. The author does not explain clearly where the conflict begins, the conflict peaks, and the resolution. The finishing part of this drama is incomplete and seems to hang.
Keywords: character, drama, family, conflict, messageKajian ini bertujuan untuk mendeskripsikan unsur tokoh, peran, karakter, peristiwa, motif, alur, konflik, latar, penggarapan bahasa, tema, dan amanat yang terdapat pada naskah drama Matahari Setengah Mati. Jenis penelitian ini menggunakan penelitian kualitatif dengan metode deskriptif. Hasil penelitian menunjukan bahwa naskah drama ini memiliki tujuh tokoh simbolis. Tokoh-tokoh ini memiliki peran dan karakternya masing-masing. Naskah drama ini bertema kehidupan keluarga tanpa seorang pemimpin tidaklah memiliki tujuan yang terarah. Banyak sekali permasalahan-permasalahan yang muncul dalam keluarga tersebut. Amanat yang dapat diambil dari naskah drama ini yaitu: a) pentingnya pendidikan agar menjadi pribadi yang cerdas dan memiliki wawasan yang luas. b) janganlah menjadi pemimpin yang tidak peduli terhadap nasib rakyat kecil. c) janganlah menjadi manusia yang tidak dapat menahan hawa nafsunya. Naskah drama ini tidaklah memiliki konflik yang jelas. Pengarang tidak menceritakan dengan jelas dibagian mana konflik dimulai, konflik memuncak, serta penyelesaian. Bagian penyelesaian drama ini tidak tuntas dan terkesan menggantung.
 
PENDEKATAN TEKNOLOGI DALAM PENGEMBANGAN KURIKULUM PENDIDIKAN DI SEKOLAH DASAR
No full textThis research aims to explore the use of technological approaches in the development of educational curricula in elementary schools. The method used in this research is a literature review. The researcher utilized various written sources such as articles, journals, and documents relevant to this study. The results show that the technological approach can enhance the effectiveness and efficiency of learning and facilitate students in achieving established learning goals. However, some obstacles were also found, such as limited access to technology in the surrounding environment or difficulties in fully integrating technology into the curriculum. Therefore, the author provides practical recommendations for educators, policymakers, and other stakeholders to optimize the use of technology in elementary education in Indonesia
BAGAIMANA MENGHUBUNGKAN PUBLIKASI ILMIAH DENGAN DATA PENELITIAN?
No full textScientific data repository has a main role in science because data can be reused, reproduced, and preserved in a long time. In Indonesia there is no institution that manage scientific data repository, generally they only manage publication such as books, journals and proceedings. This is because, most of research data is still managed by a researcher or research group. By using literature study and survey to the journal publisher, authors want to get an information on how to manage research data by publications. Furthermore, the result of literature study is compared to the survey result that produces an important point i.e journal publisher strongly agree to make a policy to the author to attach research data in every paper submitted. Most of journal publisher use Open Journal System (OJS) in managing journal articles, start from paper acceptance until paper publishing. Through this way, research data that attached will be automatically stored to the scientific data repository system based on Application Programming Interface (API)
Direct observation of subsurface charge ordering in Fe3O4(001) by scanning tunneling microscopy/spectroscopy
No full textIn this study, we characterized Fe3O4(001) films using scanning tunneling microscopy/spectroscopy (STM/STS). On the film surfaces, individual iron atoms and (root 2 x root 2)R45 degrees reconstructed structures were observed by STM. The STS results showed that the local density of states just below the Fermi level was higher in narrow sections than in wide sections of the surface reconstruction perpendicular to the iron rows. Periodic density of states modulations reproducing this electronic structure were clearly observed in the differential tunneling conductance map. These experimental results revealed the presence of subsurface charge ordering of Fe2+-Fe2+ and Fe3+-Fe3+ dimers, as proposed in previous density functional theory studies
