cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
Agung Nugroho
Contact Email
jmfs@lppm.itb.ac.id
Phone
+6222-86010051
Journal Mail Official
jmfs@lppm.itb.ac.id
Editorial Address
ITB Journal Publisher, LPPM ITB, Center for Research and Community Services (CRCS) Building 6th & 7th Floor , Jl. Ganesha No. 10 Bandung 40132, Indonesia
Location
Kota bandung,
Jawa barat
INDONESIA
Journal of Mathematical and Fundamental Sciences
Published by Institut Teknologi Bandung
ISSN : 23375760     EISSN : 23385510     DOI : https://doi.org/10.5614/j.math.fund.sci.
Core Subject : Science, Education,
Astronomy Chemistry Earth & Planetary Sciences Mathematics Physics
Journal of Mathematical and Fundamental Sciences welcomes full research articles in the area of Mathematics and Natural Sciences from the following subject areas: Astronomy, Chemistry, Earth Sciences (Geodesy, Geology, Geophysics, Oceanography, Meteorology), Life Sciences (Agriculture, Biochemistry, Biology, Health, Medical, Pharmacy), Mathematics, Physics, and Statistics.
Arjuna Subject : Matematika - Matematika (Lain-Lain)
Articles 5 Documents
 1 
Search results for , issue "Vol. 31 No. 2 (1999)" : 5 Documents clear
Pre-kompensasi Respon Saluran Transmisi pada Jaringan Akses Multimedia ADSL 1,6 Mbps Suhono H. Supangkat; Eru P.
Journal of Mathematical and Fundamental Sciences Vol. 31 No. 2 (1999)
Publisher : Institute for Research and Community Services (LPPM) ITB

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

Abstract

Sari. Berkembangnya pola kehidupan masyarakat semakin meningkatkan kebutuhan akan layanan yang mudah dan cepat, seperti jaringan akses multimedia. Salah satu kelompok sistem xDSL yang merupakan teknologi jaringan akses alternative adalah 16-QAM-ADSL. Masalah utama yang dihadapi dalam sistem Xdsl adalah memperkecil pengaruh respons saluran transmisi, yang umumnya dapat menggunakan equalizer. Pre-kompensasi respons saluran transmisi dapat ditambahkan untuk membantu kerja equalizer. Pre-kompensasi adalah sebuah filter yang ditambahkan sebuah ADC untuk kompensasi awal respons saluran transmisi. Penggunaan pre-kompensasi dapat memperpendek panjang koefisien equalizer menjadi sekitar 20 tap, yang apabila tanpa pre-kompensasi memerlukan sampai 100 tap. 16-QAM-ADSL dapat mencapai kapasitas 1,6 Mbps (TI/DSI pada 1,544 Mbps) pada saluran sejauh 18 kft. 26 AWG. Sistem transceiver 16-QAM-ADSL yang diteliti di sini dapat bekerja dengan baik setelah melakukan pelatihan selama 0,25 detik. Kesalahan fasa sampling sekitar 7,2 derajat dan frekuensi sampling sekitar 10kHz. Transmission Channel of Pre-compensation Response in the ADSL 1.6M bps Multimedia Access NetworkAbstract. The development of the living pattern of society has increased the needs of faster and easier services, such as multimedia access network. One of the xDSL family, as an alternative to the network access technology, is the 16-QAM ADSL. The main problem in xDSL is reducing the transmission channel response which usually can be accomplished by using an equalizer. Transmission channel of pre-compensation response can be added to assist the work of the equalizer. A pre-compensation is a filter which has been added before ADC to compensate the earlier response of the transmission channel. The utilization of the pre-compensation can reduce the length of the equalizer coefficients from 100 tap to 20 tap. The 16-QAM ADSL can reach the capacity of 1.6M bps (TI/DSI 1.544Mbps) in a 18 kft channel 26 AWG. The 16-QAM ADSL transceiver system which is explored in this study has worked well after 0.25 second training period. The sampling phase error is about 7.2° and the sampling frequency error is about 10 Khz.
Pengendalian Inverter Resonan DC Pekik Argo Dahono
Journal of Mathematical and Fundamental Sciences Vol. 31 No. 2 (1999)
Publisher : Institute for Research and Community Services (LPPM) ITB

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

Abstract

Sari. Pada makalah ini, dibahas teknik kendali inverter resonan sisi DC jenis tegangan dan jenis arus. Ditunjukkan dalam makalah ini bahwa teknik kendali yang telah dikembangkan untuk mengendalikan inverter resonan jenis tegangan bisa diterapkan untuk mcngendalikan inverter resonan jenis arus. Pada inverter resonan jenis tegangan, arus mula di induktor resonan harus dikendalikan sedemikian rupa sehingga bias djamin bahwa tegangan di kapasitor resonan akan kembali ke nilai nol di akhir perioda resonansi dan mempunyai nilai puncak yang minimum. Sebaliknya, pada inverter resonan jenis arus, tegangan mula di kapasitor resonan harus dikendalikan sedemikian rupa sehingga bisa dijamin bahwa arus di induklor resonan akan kembali ke nilai nol di akhir priode resonarsi dan mempuryai nilai puncak yang minimum. Kesahihan konsep yang diusulkan ini diuji dengan membandingkannya dengar hasil percobaaan. A Control Method for Resonant DC Link InvertersAbstract. This paper presents a control method for voltage-type and current-type resonant DC link inverters. It shows that the control method that has been developed for voltage-type resonant DC inverters can also be applied to the current-type ones. In voltage-type resonant DC link inverters, the initial current of resonant inductor is controlled in such a way to ensure that the resonant capacitor voltage will return to zero at the end of each resonant cycle. On the other hand in current-type inverters, the initial voltage of resonant capacitor is controlled n such a way so that the resonant inductor current will return to zero at the end of each resonant cycle. Validity of the proposed control method is verified by experimental results.
Artonol B and Sikloartobilosanton dari Artocarpus teysmanii MIQ Lukman Makmur; Syamsurizal Syamsurizal; Tukiran Tukiran; Yoharmus Syamsu; Sjamsul Arifin Achmad; Euis Holisotan Hakim; Didin Mujahidin; Norio Aimi; Mariko Kitajima; Hiromitsu Takayama
Journal of Mathematical and Fundamental Sciences Vol. 31 No. 2 (1999)
Publisher : Institute for Research and Community Services (LPPM) ITB

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

Abstract

Dua senyawa masing-masing turunan santon lakton, yaitu artonol B (1) dan turunan furanodihidrobenzosanton, yakni Sikloartobilosanton (2), telah ditemukan pada tumbuhan Artocarpus teysmanii Miq. (Moraceae), suatu tumbuhan langka yang endemik untuk Indonesia dan dikenal dengan nama Tipulu. Struktur molekul kedua senyawa tersebut telah ditetapkan berdasarkan data fisika dan spektroskopi (MS, 1H dan 13C NMR). Artonol B (1) dan sikloartobilosanton (2) memperlihatkan toksisitas yang tinggi terhadap udang Artemia salina, dan senyawa 2 juga memperlihatkan aktivitas antimitotik yang rendah terhadap target cdc2 kinase dan cdc25 fosfatase. Artonol B and Cycloartobiloxanthone from Artocarpus teysmanii MIQTwo compounds, a xanthone lactone derivative, namely artonol B (1) and a furanodihydrobenzoxanthone derivative, namely cycloartobiloxanthone (2) had been isolated from Artocarpus teysmanii Miq. (Moraceae), locally known as Tipulu. The structures of both compounds were elucidated based on physical and spectroscopic data (MS, 1H and 13C NMR). Both artonol B (1) and cycloartobiloxanthone (2) showed strong toxicity against Artemia salina in the shrimp bioassay, and compound 2 also showed weak antimitotic activity against cdc2 kinase and cdc25 phosphatase as the targets. Bagian ke-8 dari seri Ilmu Kimia Tumbuhan Moraceae Indonesia, untuk bagian ke-6 lihat pustaka [10].
Senyawa Turunan Piranoflavon dan Furanodihidrobenzoxanton dari Artocarpus Ianceifolius Euis Holisotan Hakim; Asnizar Asnizar; Fera Kurniadewi; Tedi Abdul Ghofar; Sjamsul Arifin Achmad; Lukman Makmur; Didin Mujahidin; Norio Aimi; Mariko Kitajima; Hiromitsu Takayama; Rusjdi Tamin
Journal of Mathematical and Fundamental Sciences Vol. 31 No. 2 (1999)
Publisher : Institute for Research and Community Services (LPPM) ITB

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

Abstract

Sari. Dua senyawa turunan piranoflavon dan furanodihidrobenzosanton, masing-masing artelastin (1) dan sikloartobiloksanton (2), telah ditemukan masing-masing pada kayu dan kulit batang tumbuhan Artocarpus lanceifolius Roxb. (Moraceae), suatu tumbuhan langka yang endemik untuk Indonesia dan dikenal dengan nama Keledang. Struktur molekul kedua senyawa tersebut telah ditetapkan berdasarkan data fisika dan spektroskopi (MS, 1H dan 13C NMR). Artelastin (1) sangat menghambat transportasi asam amino leusin melalui membran usus ulat sutera Bontbyx mori, sedangkan sikloartobilosanton (2) menunjukkan toksisitas yang tinggi terhadap udang Artemia salina. Pyranoflavone and Furanodihydrobenzoxanthone Derivatives from Artocarpus IanceifoliusAbstract. Two pyranoflavone and furanodihydrobenzoxanthone derivatives, namely artelastin (1) and cycloartobiloxanthone (2), had been isolated respectivelfy from the wood and the tree bark of Artocarpus lanceifolius Roxb. (Moraceae), an endemic species of lndonesia, locally known as Keledang. The structures of both compounds were elucidated based on physical and spectroscopic data (MS, 1H and 13C NMR). Artelastin (1) strongly inhibited leucin amino acid transport in Bombyx mori midgut, while cycloartobiloxanthone (2) showed high toxicity against Artemia salina shrimp. Bagian ke-6 dari seri Ilmu Kimia Tumbuhan Moraceae Indonesia, untuk bagian ke-5 lihat Pustaka (8)
Isomerisasi 1-buten Menggunakan Zeolit Alam asal Malang, Jawa Timur, sebagai Katalis Melia Laniwati
Journal of Mathematical and Fundamental Sciences Vol. 31 No. 2 (1999)
Publisher : Institute for Research and Community Services (LPPM) ITB

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

Abstract

Sari. Isomerisasi l-buten dengan katalis zeolit alam asal Malang, Jawa Timur, dilangsungkan dalam reaktor isotermal unggun tetap dengar suhu divariasikan antara 300° dan 550°C. Reaktan berupa l-buten diproduksi melalui reaksi dehidrasi n-butanol dengan menggunakan katalis alumina aktif pada suhu 400 °C. Komponen utama dalam zeolit alam asal Malang ini adalah mordenit. Zeolit alam, baik yang tidak maupun yang telah diprotonasi atau diasamkan, cukup baik dalam mengkatalisis isomerisasi interkonversi l -buten. Namun, dengan keasaman yang dimilikinya, zeolit alam ini kurang mampu mengisomerisasi l-buten menjadi isobutilen. Produk utama yang dihasilkan adalah trans-2-buten. Konversi reaksi yang dapat dicapai adalah sekitar 78,8%-84,5%. Pada suhu 500°-550 °C konversi dapat mencapai 100%, tetapi yang terjadi bukan isomerisasi melainkan perengkahan. Isomerization of 1-Butene on Natural Zeolite from Malang, East Java, as CatalystAbstract. The isormerization of 1 -butene with natural zeolite from Malang, East Java, as catalyst was carried out in an isothermal fixed bed reactor. The temperature has been varied from 300° up to 550°C. 1-Butene has been prepared by dehydration of n-butanol on alumina active at 400°C. The main component of natural zeolite from Malang is mordenite. Natural zeolite is an effective catalyst for the interconversion isomerization of 1-butene, but unfortunately its acidity is not enough for skeletal isomerization. The main product is 2-trans-butene. The 1-butene conversion ranged from 78.8% to 84.5%. At the high temperature (500°- 550°C), all reactants would be cracked 100%.

Page 1 of 1 | Total Record : 5

 1 

Filter by Year

1999 1999


Reset
Filter By Issues
All Issue Vol. 56 No. 3 (2024) Vol. 56 No. 1 (2024): (In Progress) Vol. 55 No. 3 (2024) Vol. 55 No. 2 (2023) Vol. 55 No. 1 (2023) Vol. 54 No. 3 (2023) Vol. 54 No. 2 (2022) Vol. 54 No. 1 (2022) Vol. 53 No. 3 (2021) Vol. 53 No. 2 (2021) Vol. 53 No. 1 (2021) Vol. 52 No. 3 (2020) Vol. 52 No. 2 (2020) Vol. 52 No. 1 (2020) Vol. 51 No. 3 (2019) Vol. 51 No. 2 (2019) Vol. 51 No. 1 (2019) Vol. 50 No. 3 (2018) Vol. 50 No. 2 (2018) Vol. 50 No. 1 (2018) Vol. 49 No. 3 (2017) Vol. 49 No. 2 (2017) Vol. 49 No. 1 (2017) Vol. 48 No. 3 (2016) Vol. 48 No. 2 (2016) Vol. 48 No. 1 (2016) Vol. 47 No. 3 (2015) Vol. 47 No. 2 (2015) Vol. 47 No. 1 (2015) Vol. 46 No. 3 (2014) Vol. 46 No. 2 (2014) Vol. 46 No. 1 (2014) Vol. 45 No. 3 (2013) Vol. 45 No. 2 (2013) Vol. 45 No. 1 (2013) Vol. 44 No. 3 (2012) Vol. 44 No. 2 (2012) Vol. 44 No. 1 (2012) Vol. 43 No. 3 (2011) Vol. 43 No. 2 (2011) Vol. 43 No. 1 (2011) Vol. 42 No. 2 (2010) Vol. 42 No. 1 (2010) Vol. 41 No. 2 (2009) Vol. 41 No. 1 (2009) Vol. 40 No. 2 (2008) Vol. 40 No. 1 (2008) Vol. 39 No. 1-2 (2007) Vol. 38 No. 2 (2006) Vol. 38 No. 1 (2006) Vol. 37 No. 2 (2005) Vol. 37 No. 1 (2005) Vol. 36 No. 2 (2004) Vol. 36 No. 1 (2004) Vol. 35 No. 2 (2003) Vol. 35 No. 1 (2003) Vol. 34 No. 2&3 (2002) Vol. 33 No. 3 (2001) Vol. 33 No. 2 (2001) Vol. 33 No. 1 (2001) Vol. 32 No. 2 (2000) Vol. 32 No. 1 (2000) Vol. 31 No. 3 (1999) Vol. 31 No. 2 (1999) Vol. 31 No. 1 (1999) Vol. 30 No. 3 (1998) Vol. 30 No. 2 (1998) Vol. 30 No. 1 (1998) Vol. 29 No. 1/2 (1996) Vol. 27 No. 3 (1994) Vol. 27 No. 2 (1994) Vol. 25 No. 2/3 (1992) Vol. 25 No. 1 (1992) Vol. 24 No. 2/3 (1991) Vol. 24 No. 1 (1991) Vol. 23 No. 1 (1990) Vol. 22 No. 1/2/3 (1989) Vol. 21 No. 2/3 (1988) Vol. 21 No. 1 (1988) Vol. 20 No. 1/2 (1987) Vol. 20 No. 3 (1987) Vol. 19 No. 2/3 (1986) Vol. 19 No. 1 (1986) Vol. 18 No. 2/3 (1985) Vol. 18 No. 1 (1985) Vol. 17 No. 3 (1984) Vol. 17 No. 2 (1984) Vol. 17 No. 1 (1984) Vol. 16 No. 3 (1983) Vol. 16 No. 2 (1983) Vol. 16 No. 1 (1983) Vol. 15 No. 3 (1982) Vol. 15 No. 2 (1982) Vol. 15 No. 1 (1982) Vol. 14 No. 1/2 (1981) Vol. 14 No. 3 (1981) Vol. 13 No. 1/2 (1980) Vol. 13 No. 3 (1980) Vol. 12 No. 3 (1979) Vol. 12 No. 2 (1979) Vol. 12 No. 1 (1979) Vol. 11 No. 3 (1978) Vol. 11 No. 2 (1977) Vol. 11 No. 1 (1976) Vol. 10 No. 3 (1976) Vol. 10 No. 2 (1975) Vol. 10 No. 1 (1975) Vol. 9 No. 3 (1975) Vol. 9 No. 2 (1975) Vol. 9 No. 1 (1974) Vol. 8 No. 3 (1974) Vol. 8 No. 2 (1974) Vol. 8 No. 1 (1974) Vol. 7 No. 4 (1974) Vol. 7 No. 3 (1973) Vol. 7 No. 2 (1973) Vol. 7 No. 1 (1973) Vol. 6 No. 4 (1972) Vol. 6 No. 3 (1972) Vol. 6 No. 2 (1971) Vol. 6 No. 1 (1971) Vol. 5 No. 1 (1970) Vol. 4 No. 4 (1970) Vol. 4 No. 3 (1969) Vol. 4 No. 2 (1968) Vol. 4 No. 1 (1967) Vol. 3 No. 4 (1965) Vol. 3 No. 3 (1965) Vol. 3 No. 2 (1964) Vol. 3 No. 1 (1964) Vol. 2 No. 4 (1963) Vol. 2 No. 3 (1963) Vol. 2 No. 2 (1962) Vol. 2 No. 1 (1962) Vol. 1 No. 4 (1961) Vol. 1 No. 3 (1961) Vol. 1 No. 2 (1961) Vol. 1 No. 1 (1961) More Issue