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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 689 Documents
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Conic Optimization, with Applications to (Robust) Truss Topology Design C. Roos; D. Chaerani
Journal of Mathematical and Fundamental Sciences Vol. 34 No. 2&3 (2002)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

After a brief introduction to the field of Conic Optimization we presentsome interesting applications to the (robust) trus topologr design (TTD)problem, where the goal is to design a truss of a given weight best ableto withstand a set of given loads. We present a linear model for thesingle-load case and semidefinite models for the multi-load and the ro'bust TTD problem. All models are illustrated by examples. It is alsoshown that by using duality the size of some of these models can bereduced significantly.
Study of Nonlinear Periodic Optical System H. Alatas; A.A. Iskandar; M. O. Tjia; T.P. Valkering
Journal of Mathematical and Fundamental Sciences Vol. 34 No. 2&3 (2002)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

We give a brief review of some results of our study on one-dimensional shallow nonlinear Bragg grating with nonlinear modulation and deep nonlinear Bragg grating.
On Kink-Dynamics of Stacked-Josephson Junctions H. Susanto; T. P. P. Visser; S. A. van Gils
Journal of Mathematical and Fundamental Sciences Vol. 34 No. 2&3 (2002)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Dynamics of a fluxon in a stack of coupled long Josephson junctions is studied numericallv. Based on the numerical simulations, we show that the dependence of the propagation velocity c on the external bias current γ is determined by the ratio of the critical currents of thc two junctions J.
Pengaruh Asam Metoksiasetat terhadap Organ Reproduksi Mencit (Mus musculus) Swiss Webster Jantan Maman Rumanta; Tien W. Surjono; Sri Sudarwati
Journal of Mathematical and Fundamental Sciences Vol. 33 No. 2 (2001)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Sari. Asam metoksiasetat (MAA) merupakan salah satu metabolit dari dimetoksietil ftalat (DMEP) yaitu suatu senyawa yang banyak digunakan dalam pembuatan plastik sebagai pelentur (plasticizer). DMEP dapat luruh dari plastik dan bila masuk ke dalam tubuh manusia, zat ini diubah menjadi MAA yang dapat menyebabkan efek teratogenik dan toksik terhadap organ tubuh. Terutama organ reproduksi jantan. Untuk meneliti pengaruh MAA terhadap organ reproduksi jantan, digunakan mencit Swiss Webster umur 7 minggu, yang cliberi dosis 100, 150, 225, dan 300 mg/kg berat badan, secara gavage setiap hari selama 4 minggu berturut-turut, dengan satu hari istirahat pada tiap akhir minggu. Kelompok mencit kontrol hanya diberi akuabides sebagai pelarut MAA. Mencit dibunuh sehari setelah pemberian MAA terakhir. Pengamatan dilakukan terhadap berat testis, berat epididimis, dan berat vesikula seminalis; jumlah, motilitas, dan morfologi spermatozoa yang diperoleh dari epididimis kauda; struktur testis yang mencakup diameter, tebal epitel, dan penampilan tubulus seminiferus; jumlah sel spermatogenik, jumlah sel Sertoli, serta jumlah sel Leydig. Dibandingkan dengan kontrol, hasil pengamatan menuniukkan penurunan berat testis dan epididimis, tetapi tidak ada penurunan berat vesikula seminalis. Jumlah dan motilitas spermatozoa menjadi lebih rendah, sedangkan jumlah spermatozoa abnormal meningkat. Diameter dan tebal epitel tubulus seminiferus menurun, demikian pula persentase tubulus seminiferus normal (fase VII), sedangkan persenfase tubulus seminiferus abnormal meningkat. Pendedahan terhadap MAA menyebabkan berdegenerasinya sel-sel spermatogenik, terutama spermatosit pakhiten dans permatid, yang ditunjukkan oleh jumlahnya yang berkurang. Spermatogonium A dan spermatosit praleptoten paling tahan terhadap MAA. Jumlah sel Sertoli dan sel Leydig tidak menurun oleh perlakuan MAA meskipun tampak adanya gejala toksik pada sel Sertoli yang ditandai oleh vakuolisasi dalam sitoplasma. Dapat disimpulkan bahwa testis merupakan organ reproduksi yang paling sensitif terhadap pengaruh MAA yang mengakibatkan terganggunya spermatogenesis pada mencit Swiss Webster. Effects of Methoxyacetic Acid on the Reproductive Organs of Male Swiss Webster Mice (Mus Musculus)Abstract. Methoxyacetic acid (MAA) is one of the metabolites of dimethoxyethyl phthalate (DMEP), which is mainly used as plasticizer in the manufacture of plastics. DMEP could leach from plastics and by entering the body, it will be metabolized into MAA which is teratogenic and toxic to several organs, particularly male reproductive organs. To investigate the effects of MAA on the male reproductive organs, seven-week-old Swiss Webster mice were treated with MAA at the doses of 100, 150, 225, and 300 mg/kg body weight daily by gavage, within four consecutive weeks with one-day interruption in each weekend. Observation was performed on the weight of testis, epididymis and seminal vesicle; the number, motility, and morphology of the spermatozoa obtained from the caudal epididymist; the histological structure of testis, including diameter, epithelial thickness and the performance of seminiferous tubule; the number of spermatogenic cells, as well as the number of Sertoli and Leydig cells. Compared to control the result showed, that testis and epididymis, but not the seminal vesicle decreased in weight. The number and motility of spermatozoa decreased, whereas the abnormal ones increased. The diameter, the epithelial thickness, as well as the percentage of normal (stage VII) seminiferous tubules were reduced, while the percentage of abnormal tubules increased. The administration of MAA led to the degeneration of spermatogenic cells, particularly the pachytene spermatocyte and spermatids, shown by the reduction in their number. The spermatogonia A and the preleptotene spermatocytes were the most resistant spermatogenic cells to MAA. The number of Sertoli and Leydig cells were not affected by MAA, despite toxic phenomenon of Sertoli cells characterized by vacuolization in the cytoplasm was shown. It is concluded that testis is the most susceptible to MAA insult, which subsequently interferes the spermatogenesis of male Swiss Webster mice.
Novel Tuning Scheme for Integrated Continuous Time Filter Ilse S. Noerbambang; Hiroaki Kunieda; Samaun Samadikun
Journal of Mathematical and Fundamental Sciences Vol. 33 No. 2 (2001)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

In integrated continuous times (C.T.) filters, automatic tuning is very important, because the filter coefficients are very sensitive to device parameters. In this paper, novel tuning scheme for the integrated C.T. hand pass biquad filter is presented. This tuning scheme is used to tune the center of frequency (f0) of a band pass biquad filter which is 550 KHz. The bandwith of this filter is 535 KHz and  the quality factor Q  is equal to one. This filter consists of four CMOS  operational transconductance amplifier (OTA) and two capacitors. The tuning scheme is realized with CMOS OTAs, a CMOS four quadrant analog multiplier with voltage output, a low pass filter and a DC amplifier. By varying the capacitor values of the band pass biquad filter 40% in both direction from the nominal value and varying the temperature from -100°C to 50°C, the center frequency of the filter remain constant at 550 KHz. It is simulated using SPICE software and operates with power supply voltages of ±5 V. Simulated results are presented and discussed.
Planar Waveguide from PPV Derivatives F. Fitrilawati; M.O. Tjia; H. Eichner; C. Bubeck
Journal of Mathematical and Fundamental Sciences Vol. 33 No. 2 (2001)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract. We report in this paper the result of thin film fabrication of MEH-PPV and MEH-PPB having good optical transparency and low surface roughness suitable for planar waveguide application. The linear optical properties of the polymers were characterized using reflectometry and prism coupling, while the non-linear optical property was measured by means of optical third harmonic generation (THG). The waveguide attenuation of the polymer films was determined by employing prism coupling set-up equipped with a photodiode array detector. The MEH-PPV waveguide film was shown to have a very low attenuation of 0.5 dB cm-1 at 1064 nm yielding an unprecedentedly high figure of merits of 11 at 1 GW/cm2. Pandu Gelombang Planar dari Turunan PPVSari. Dalam tulisan ini dilaporkan fabrikasi film tipis polimer MEH-PPV dan MEH-PPB yang mempunyai transparansi optik tinggi dan permukaan yang halus sehingga cocok untuk aplikasi pandu gelombang planar. Sifat optic linier dari polimer yang bersangkutan diukur dengan teknik reflektometri dan kopling prisma dan sifat optic nonlinier diukur dengan metoda third harmonic generation (THG). Selanjutnya, atenuasi pandu gelombang dari film polimer yang bersangkutan diukur dengan konfigurasi kopling prisma dan detector diode arrat. Film pandu gelombang yang dihasilkan dalam eksperimen ini memiliki atenuasi rendah sebesar 0.5 dB cm-1 pada panjang gelombang 1064 nm dan menghasilkan "figure of merits" (FOM) sebesar 11 pada intensitas 1 GW/cm2 yang merupakan nilai tertinggi sejauh ini.
Separation of Carbon Dioxide (CO2) from Gas Mixture by Membrane Permeation Process V. Soesilowati Praptowidodo
Journal of Mathematical and Fundamental Sciences Vol. 33 No. 2 (2001)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Removal of CO2 from natural gas and combustion exhaust gas have been studied by employing membrane permeation process. In these studies, polysulfone, polyimide and polydimethylsiloxane membranes are used to elucidate the influence of flexibility and rigidity of polymer as well as the influence of polar groups within polymer matrix on gas transport through membrane. The performance of the membranes as specified by its selectivity and permeation flux are measured in terms of the diffusion and sorption coefficients as well as the permeability. It is found that flexibility of the membrane tends to suppress its selectivity while enhancing its permeation flux. On the other hand, rigidity of the membrane together with the polar groups is shown to induce the opposite effects. In both cases however, the selectivity and permeation follow approximately the same qualitative variations with respect to concentration which is suspected to be caused by the plasticization effect in the membrane. It is therefore concluded that a rigid polymer membrane with polar groups is most effective for its performance. Pemisahan karbon dioksida (CO2) dari campuran gas dengan permeasi membranSari. Penghilangan CO2 dari gas alam dan gas buang hasil pembakaran dipelajari dengan cara permeasi membrane. Dalam studi ini membran polisulfon, polimid, dan membran karet silicon (polidimetilsiloksan) dipergunakan dalam rangka mempelajari pengaruh kelenturan dan kekakuan polimer serta pengaruh gugus polar dalam matriks polimer pada perpindahan gas melalui membrane. Kinerja membrane ditentukan oleh seletivitas dan fluks permeasi yang diukur dari besaran koefisien difusi, koefisien sorpsi dan permeabilitas. Hasil percobaan menunjukkan bahwa kelenturan membran cenderung menekan seletivitas namun dapat menaikkan fluks permeasi. Sedangkan kekakuan membrane disertai gugus polat dalam matriks polimer memberikan efek yang berlawanan. Dalam kedua kasus tersebut, seletivitas dan fluks permeasi mengikuti variasi kualitatif yang mirip terhadap pengaruh konsentrasi CO2, diperkirakan dapat menyebabkan efek plastisasi dalam membrane. Disadarkan pada hasil penemuan seperti tersebut di atas, maka dapat disimpulkan bahwa polimer membran kaku dengan gugus polar merupakan membran yang paling efektif untuk penghilangan CO2 dari gas alam dan gas buang hasil pembakaran.
PQL: Operasi Komposisi dan Jaringan Semantik Data Benhard Sitohang
Journal of Mathematical and Fundamental Sciences Vol. 33 No. 2 (2001)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Sari. Public Query Language (PQL) adalah bahaas penelusuran (query) pada basis data model relasi, yang lebih bersifat user friendly relative terhadap bahasa penelusuran pada Generasi ke-IV (SQL, QBE, QUEL, dll). Dari sisi struktur bahasa, PQL didasarkan pada struktur sintaks linier (tidak terdapat struktur blok rekursif). Pada sisi tampilan, hasil eksekusi dibentuk berdasarkan definisi entitas (bukan tuppel, seperti pada SQL). Dengan demikian duplikasi data pada tampilan dapat dihilangkan. Proses query dan prinsip tampilan yang dimaksudkan pada PQL dapat diimplementasikan dalam DBMS, dengan menerapkan teknik penggabungan (operator komposisi), yang didasarkan pada prinsip operator join dan navigasi pada jaringan semantik data. Operator komposisi dan jaringan semantik data adalah topik utama penelitian yang dijelaskan pada tulisan ini. PQL: Composition Operator and Semantic Data NetworkAbstract. Public Query Language (PQL) is the syntax of query for relational database, which is categorized as highly user friendly compared to the 4-th generation language (SQL, QBE, QUEL,etc.). As a query language, PQL is constructed as linear syntax (without block recursive). Visualization of the result is constructed as an entity (not tupple, as happened in SQL). As a consequence, duplication of data on the results could be rejected. Query process and the principle of visualization of result of PQL can be adapted as part of DBMS, using composition method  (Composition Operator), developed as an interpretation of join operator and navigation, supported by Data Semantic Network. Both Composition Operator and Data Semantic Network are main topic discussed in this article, as the result of this research on PQL.
Effects of Substrate Temperature on Vacuum Deposited Thin Film of Disperse Red 1 on ITO Glass H. Taunaumang; Herman Herman; M. O. Tjia
Journal of Mathematical and Fundamental Sciences Vol. 33 No. 1 (2001)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract. Highly crystalline thin films of photorefractive Disperse Red 1 (DR 1) molecule have been fabricated on clean substrate of ITO (indium tin oxide) glass by means of physical vapor deposition at various substrate temperatures. In addition to molecular orientation and organization revealed by their XRD and FTIR spectral characteristic and the enhancement of those effects by substrate temperature, further analysis of FTIR spectrum around nitrobenzene absorption band indicates the formation of strong hydrogen bond resulting in a head-tail stacking of the molecules. The deposited films also show systematic reduction of light absorption in the visible region with increasing substrate temperature. This modification of the optical property is clearly favorable for long wavelength photonic applications of DR1 film. Pengaruh Suhu Substrat pada Film Tipis 'Disperse Red 1' yang Dideposisi pada Gelas ITO dalam VakumSari. Dalam eksperimen ini telah berhasil diperoleh melalui proses deposisi vakum sejumlah film tipis bahan fotorefraktif dari molekul "Disperse Red 1" (DR1) dengan krisalinitas tinggi di atas substrat gelas ITO ("indium tin oxide") pada berbagai suhu. Selain efek orientasi dan organisasi molekul yang ditunjukkan oleh karakteristik spectra XRD dan FTIR bersangkutan serta peningkatan efek tersebut dengan suhu substrat, analisis lebih lanjut dari data FTIR di sekitar pita absorpsi nitrobenzene telah mengungkapkan tanda embentukan ikatan hydrogen yang kuat yang menghasilkan susunan "head-tail" yang bertumpuk. Film yang terdeposisi juga memperkihatkan pengurangan absorpsi cahaya secara sistematik di daerah tampak, seiring dengan peningkatan suhu substrat. Perubahan sifat optik ini jelas bermanfaat bagi aplikasi film DR1 untuk devais fotonik dalam daerah gelombang panjang.
Effect of Annealing Treatment on the Optical Properties of Zinc Oxide (ZnO) thin film prepared by MOCVD Iis Nurhasanah; Priyono Priyono; Wilson W Wenas
Journal of Mathematical and Fundamental Sciences Vol. 33 No. 1 (2001)
Publisher : Institute for Research and Community Services (LPPM) ITB

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The annealing treatment of ZnO thin film at various temperatures was performed. The effect of this treatment on the optical properties of ZnO thin film were investigated in order to apply this film to optoelectronic devices. The optical transmittance spectra  were measured and it was found that the transmittance in UV-VIS region decreased with annealing temperature . The loss of light is mainly due to  the increase of carrier density, resulting from increased oxygen vacancies during the annealing process at 300°C. It was also found that the absorption edge shifted to lower energy when the film was annealed at 300°C in air.

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