Jurnal Fisika最新文献

{"title":"Pengaktifan Kimia Berbantuan Gelombang Mikro Karbon Aktif dari Kulit Kacang dengan Waktu Pra-karbonisasi yang Berbeda","authors":"Awitdrus Awitdrus, Dewi Mulfida, Rakhmawati Farma, Saktioto Saktioto, Iwantono Iwantono","doi":"10.15294/jf.v8i2.16974","DOIUrl":"https://doi.org/10.15294/jf.v8i2.16974","url":null,"abstract":"Karbon aktif berbahan dasar kulit kacang (Arachis hypogaea L) disintesis menggunakan metode pengaktifan kimia berbantuan gelombang mikro. Kulit kacang dipra-karbonisasi selama 2 jam, 3 jam dan 4 jam pada temperatur 200 o C. Pengaktifan kimia dilakukan menggunakan kalium hidroksida dengan rasio massa pra-karbonisasi dan kalium hidroksida adalah 2:1 selama 24 jam. Iradiasi gelombang mikro dilakukan pada daya keluaran 630 watt selama 20 menit. Sifat fisika karbon aktif dikarakterisasi menggunakan difraksi sinar-X untuk mengetahui struktur mikro, isoterma adsorpsi/desorpsi N 2 untuk mengetahui parameter porositas, serta infra merah transformasi Fourier untuk mengetahui struktur rantai karbon aktif. Pola difraksi sinar-X menunjukkan bahwa semua karbon aktif memiliki struktur turbostratik yang ditandai dengan adanya puncak (002) dan (100). Luas permukaan dan volume pori karbon aktif tertinggi adalah 153 m 2 /g dan 0,064 cm 3 /g untuk karbon aktif dengan waktu pra-karbonisasi selama 2 jam. Struktur rantai karbon menunjukkan adanya  gugus fungsi P=O, C-O, C-C, C-H pada bilangan gelombang 1031 cm -1 , 1609,67 cm -1 , 2363,87 cm -1 , dan 2867,31 cm -1 .","PeriodicalId":30730,"journal":{"name":"Jurnal Fisika","volume":"8 1","pages":"43-50"},"PeriodicalIF":0.0,"publicationDate":"2018-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49119802","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Kajian Struktur Serat dan Porositas Masker Udara","authors":"Handika Dany Rahmayanti, R. Rahmawati, E. Sustini, Mikrajuddin Abdullah","doi":"10.15294/JF.V8I1.13966","DOIUrl":"https://doi.org/10.15294/JF.V8I1.13966","url":null,"abstract":"There are 6 brands of air masks on the market that are Evo med, Nexcare carbon, Nexcare daily, Indomaret, Borma and Evo club. All masks on the market have 3 layers. Based on the results of microscopy testing showed that the fiber diameter image of all mask brands in layer 2 is smaller than layer 1 and 3. Generally, all brands of masks show a uniform fiber size distribution. From the surface porosity measurements, Borma masks have a larger porosity than other masks in layers 1, 2 and 3 ie 60.64%, respectively; 42.95% and 63.58%. The results show that the difference in mask price in the market does not show the quality standards of different mask filters. Furthermore, the results of this study may contribute to the development of research on masks.","PeriodicalId":30730,"journal":{"name":"Jurnal Fisika","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41869064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analisis Homogenitas Citra Ultrasonografi Berbasis Silicone Rubber Phantom dengan GLCM","authors":"Siti Fatimah, Giner Maslebu, S. Trihandaru","doi":"10.15294/JF.V8I1.14359","DOIUrl":"https://doi.org/10.15294/JF.V8I1.14359","url":null,"abstract":"Uji homogenitas merupakan salah satu kontrol kualitas ultrasonografi (USG). Pelaksanaan kontrol kualitas USG  dibutuhkan modalitas yaitu phantom ultrasound. Telah dibuat phantom ultrasound sederhana dan murah berbahan dasar silikon rubber RTV (Room Temperature Vulcanitation)  tipe 52 dengan konsentrasi katalis 2% dan 5%. Analisis homogenitas citra dilakukan dengan metode Gray Level Co-occurrence Matrix (GLCM). Pada phantom dengan konsentrasi katalis 5% didapatkan densitas  dan pada phantom konsentrasi katalis 4% didapatkan densitas  dengan selisih densitas relatif 11,65%. Berdasarkan penelitian ini didapatkan hasil semakin tinggi nilai gain yang digunakan maka homogenitas semakin rendah. Nilai homogenitas untuk phantom ultrasound dengan konsentrasi katalis 5% didapatkan 0.9945 dan phantom konsentrasi katalis 2% didapatkan nilai homogenitas 0.9940 dengan selisih homogenitas relatif 0.0543% yang menggambarkan nilai homogenitas yang tinggi untuk masing-masing phantom. Pada phantom dengan 2 densitas berbeda didapatkan nilai homogenitas 0.9881. Jika dibandingkan terhadap katalis 2%, maka selisih homogenitas relatifnya sebesar 0.648% dan terhadap katalis 5% sebesar 0.594%.","PeriodicalId":30730,"journal":{"name":"Jurnal Fisika","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44508321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimization of Trial Wave Function in Determining the Ground State Energy of Helium Atom","authors":"Y. Yulianto, Z. Su'ud","doi":"10.15294/JF.V8I1.14614","DOIUrl":"https://doi.org/10.15294/JF.V8I1.14614","url":null,"abstract":"The atomic ground state properties of helium, especially with regard to the ground state energy, can be studied by using various methods. One such method is the variational method. In this study, the atomic ground state energy for helium was calculated by using the trial wave function with four various parameters. The optimization process was performed by using Nelder-Mead method implied in script-code of Fortran. From calculation results, the symmetry new wave function, which meets both Pauli exclusion principle and Hund’s rule, was obtained. This obtained wave function can be written as $Psi=0.3891exp(-1.9240r_1-0.9301r_2)+0.3891exp(-0.9301r_1-1.9240r_2)$. The atomic ground state energy obtained by this trial wave function is in good agreement with experimental energy, i.e.  eV (with discrepancy of  from experimental result). It can be indicated that the obtained trial wave function is quite good in explaining the atomic ground state properties of helium. In addition, the Nelder-Mead method used in this study is quite good in optimizing the equation with four variation parameters. The atomic ground state properties of helium, especially with regard to the ground state energy, can be studied by using various methods. Such method is the variational method. In this study, the atomic ground state energy for helium was calculated by using the trial wave function with four various parameters. The optimization process was performed by using Nelder-Mead method implied in script-code of Fortran. From calculation results, the symmetry new wave function, which meets both Pauli exclusion principle and Hund’s rule, was obtained. This obtained wave function can be written as ψ=0.3891 \u0000 exp - 1.9240 r 1 - 0.9301 r 2 +0.3891 \u0000 exp - 0.9301 r 1 - 1.9240 r 2 . The atomic ground state energy obtained by this trial wave function is - 79.004623  eV (with discrepancy of 0.000671%  from the experimental energy), where this result is in good agreement with the experimental energy. It can be inferred that the obtained trial wave function is quite good in explaining the ground state properties of helium atom. In addition, the Nelder-Mead method used in this study has good capability in optimizing the equation with four variation parameters.","PeriodicalId":30730,"journal":{"name":"Jurnal Fisika","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49616988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Karakterisasi Citra CT Scan Otak Menggunakan Analisis Fraktal Berbasis Transformasi Fourier","authors":"Resi Rusmawarningsih, N. Nurhasanah, Joko Sampurno","doi":"10.15294/jf.v8i1.13645","DOIUrl":"https://doi.org/10.15294/jf.v8i1.13645","url":null,"abstract":"Citra Computerized Tomography (CT) scan otak normal dan citra CT scan otak abnormal (tumor) telah dianalisis dengan menggunakan metode fraktal berbasis transformasi Fourier. Analisis dilakukan untuk menentukan tingkat kompleksitas dan densitas citra berdasarkan nilai dimensi fraktal dan intercept dari masing-masing citra. Hasil citra CT scan otak normal memiliki dimensi fraktal antara 1,355 hingga 1,5851, dan citra CT scan otak abnormal (tumor) memiliki dimensi fraktal antara 0,66106 hingga 1,2888. Citra CT scan otak normal memiliki intercept antara 25,1434 hingga 26,5707, dan citra CT scan otak abnormal (tumor) memiliki intercept antara 27,6737 hingga 31,6697. Nilai dimensi menunjukkan tingkat kompleksitas citra dan nilai intercept citra mengindikasikan nilai densitas citra. Citra CT scan otak normal memiliki tingkat kompleksitas yang lebih tinggi dan citra CT scan otak abnormal (tumor) memiliki nilai densitas yang lebih tinggi.","PeriodicalId":30730,"journal":{"name":"Jurnal Fisika","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44297019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Studi Pembentukan Scale CaCO3 dan CaSO4 pada Air Formasi Sumur Minyak di Cepu, Indonesia","authors":"Dante Alighiri, Cici Fatmala, Imam Syafi'i, Ervan Bagus Haditya","doi":"10.15294/jf.v8i1.14496","DOIUrl":"https://doi.org/10.15294/jf.v8i1.14496","url":null,"abstract":"Scale merupakan salah satu masalah besar di pertambangan minyak bumi di Indonesia yang dapat menyebabkan sistem injeksi air pada proses pengeboran minyak bumi terhambat dan menyebabkan penurunan produksi minyak bumi. S cale CaCO 3 dan CaSO 4 pada dua sumur minyak di Cepu, Indonesia dianalisis dengan tujuan untuk memperkirakan besar kecenderungan air formasi dalam membentuk scale . Metode Stiff & Davis digunakan untuk menentukan kecenderungan terbentuknnya scale CaCO 3 dan metode Skillman, McDonald & Stiff untuk menentukan kecenderungan terbentuknnya scale CaSO 4 . Nilai indeks stabilitas (SI) pada sumur minyak X1 sebesar 1,71 dan sumur minyak X2 sebesar 1,82. Nilai SI yang positif menunjukkan bahwa kedua sumur tersebut mempunyai kecenderungan untuk membentuk scale CaCO 3 . Nilai konsentrasi S pada sumur minyak X1 sebesar 58,97 meq/L dan sumur minyak X2 sebesar 57,18 meq/L. Nilai konsentrasi ion Ca 2+ pada sumur minyak X1 sebesar 12,03 meq/L dan sumur minyak X2 sebesar 16,04 meq/L. Nilai konsentrasi ion SO 4 2- pada sumur minyak X1 sebesar 0,46 meq/L dan sumur minyak X2 sebesar 0,69 meq/L. Nilai S yang lebih besar dibanding nilai konsentrasi ion Ca 2+ dan SO 4 2- menunjukkan bahwa pada kedua sumur minyak air formasi tidak menunjukkan kecenderungan terbentuknya scale CaSO 4 .","PeriodicalId":30730,"journal":{"name":"Jurnal Fisika","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47104827","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Uji Efektivitas Ekstraksi Limbah Seng menjadi Seng Oksida(ZnO) dengan Metode Presipitasi","authors":"Laras Ati, Priyandika D.R, A. Yulianto, M. P. Aji","doi":"10.15294/JF.V7I2.13372","DOIUrl":"https://doi.org/10.15294/JF.V7I2.13372","url":null,"abstract":"Seng adalah logam dengan warna putih kebiruan yang mudah larut dalam asam klorida encer (HCI) dan asam sulfat (H 2 SO 4 ) encer dengan mengeluarkan hidrogen. Kandungan seng diseluruh dunia sangat besar, yaitu mencapai 1,8 gigaton, seiring dengan itu diproduksi pula logam seng tak murni yang dimulai pada abad ke-13. Seiring dengan banyaknya jumlah seng baik yang ada di alam maupun yang diproduksi secara tidak murni ini, maka jumlah limbah seng yang ada di lingkungan sekitar juga bertambah semakin banyak. Untuk mengurangi jumlah limbah seng ini maka kemungkinan dapat dilakukan ekstraksi limbah seng menjadi seng oksida. Metode ekstraksi ini dapat dilakukan dengan beberapa cara, salah satunya adalah metode presipitasi. Pengolahan dengan metode presipitasi dilakukan dengan memotong limbah seng menjadi bagian-bagian kecil, kemudian dilarutkan dalam larutan HCI sampai tercapai keadaan jenuh. Setelah mencapai keadaan jenuh, larutan kemudian di titrasi dengan NaOH hingga terbentuk endapan. Endapan yang dihasilkan ini dicuci untuk menghilangkan kadar air. Ciri-ciri terbentuknya Seng Oksida yaitu adanya endapan berwarna putih yang tidak larut dalam larutan netral. Untuk menguji ketepatannya, sampel dikarakterisasi menggunakan X-Ray Diffraction. Pada penelitian ini, setelah diuji menggunakan XRD, hasilnya menunjukkan tidak adanya seng oksida yang terbentuk. Berdasarkan hasil ini, dapat diketahui bahwa metode presipitasi tidak efektif jika digunakan dalam proses ekstraksi limbah seng menjadi seng oksida.","PeriodicalId":30730,"journal":{"name":"Jurnal Fisika","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66999896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simulasi Sea Breeze Front Pada Tanggal 6 Februari 2016 dan 14 September 2016 Menggunakan Model Numerik Skala Meso WRF-ARW di Jakarta","authors":"D. Fatmasari, D. Dewi, P. Winarso","doi":"10.15294/JF.V7I2.13368","DOIUrl":"https://doi.org/10.15294/JF.V7I2.13368","url":null,"abstract":"","PeriodicalId":30730,"journal":{"name":"Jurnal Fisika","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66999722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Alat Eksperimen Hukum Pascal dengan Memanfaatkan Sensor Load Cell Berbasis Arduino Uno pada Dongkrak Hidrolik","authors":"Anisa Satya Sandy, Inge Mireya Thalia Putriardi, M. Afifah, Pratiwi Kusumawardhani, Rengga Ngesthi Pambuka","doi":"10.15294/JF.V7I1.13362","DOIUrl":"https://doi.org/10.15294/JF.V7I1.13362","url":null,"abstract":"","PeriodicalId":30730,"journal":{"name":"Jurnal Fisika","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66999266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Penentuan Nilai B-Value Untuk Identifikasi Kerentanan Batuan Dengan Mempertimbangkan Nilai Slowness Pada Wilayah Pidie Jaya","authors":"Ramadhan Priadi, Januar Arifin","doi":"10.15294/jf.v7i1.13363","DOIUrl":"https://doi.org/10.15294/jf.v7i1.13363","url":null,"abstract":"","PeriodicalId":30730,"journal":{"name":"Jurnal Fisika","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66999345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}