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 9 Documents
 1 
Search results for , issue "Vol. 46 No. 2 (2014)" : 9 Documents clear
Full Tensor Gradient of Simulated Gravity Data for Prospect Scale Delineation Hendra Grandis; Darharta Dahrin
Journal of Mathematical and Fundamental Sciences Vol. 46 No. 2 (2014)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2014.46.2.1

Abstract

Gravity gradiometry measurement allows imaging of anomalous sources in more detail than conventional gravity data. The availability of this new technique is limited to airborne gravity surveys using very specific instrumentation. In principle, the gravity gradients can be calculated from the vertical component of the gravity commonly measured in a ground-based gravity survey. We present a calculation of the full tensor gradient (FTG) of the gravity employing the Fourier transformation. The calculation was applied to synthetic data associated with a simple block model and also with a more realistic model. The latter corresponds to a 3D model in which a thin coal layer is embedded in a sedimentary environment. Our results show the utility of the FTG of the gravity for prospect scale delineation.
Cassava Pulp Hydrolysis under Microwave Irradiation with Oxalic Acid Catalyst for Ethanol Production Euis Hermiati; Shuntaro Tsubaki; Jun-ichi Azuma
Journal of Mathematical and Fundamental Sciences Vol. 46 No. 2 (2014)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2014.46.2.2

Abstract

Microwave irradiation is an alternative method of starch hydrolysis that offers a rapid process. The aim of this research was to improve microwave-assisted hydrolysis of cassava pulp by using oxalic acid as a catalyst. Suspension of cassava pulp in 0.5% oxalic acid (1 g/20 mL) was subjected to microwave irradiation at 140-230 °C for 5 minutes, with 4 minutes of pre-heating. One gram of fractured activated carbon made of coconut shell was added into a number of suspensions that were subjected to the same conditions of microwave irradiation. The soluble fraction of the hydrolysates was analyzed for its total soluble solids, malto-oligomer distribution, glucose content, pH value, and formation of brown compounds. The effects of the combined severity parameter at a substrate concentration of 5-12.5% on the glucose yield were also evaluated. The highest glucose yield (78% of dry matter) was obtained after hydrolysis at 180 °C without activated carbon addition. Heating above 180 °C reduced the glucose yield and increased the pH and the formation of brown compounds. The use of activated carbon in microwave-assisted acid hydrolysis of cassava pulp reduced the glucose yield, but suppressed the formation of brown compounds. The highest glucose yield (70-80% of dry matter) was attained at a severity parameter of 1.3-1.5.
On The Double-Vacua Duality of Multi-Scalar Higgs and NGB-Dual Higgses in Scherk-Schwarz Breaking of 5-dimensional SU(6) Symmetry Jusak Sali Kosasih; Andreas Hartanto; Laksana Tri Handoko; Freddy Permana Zen
Journal of Mathematical and Fundamental Sciences Vol. 46 No. 2 (2014)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2014.46.2.3

Abstract

A special condition of Scherk-Schwarz and S^1/Z2 orbifold breaking brings about both a weakly-coupled SU(6) baby Higgs and a strongly-coupled will-be simplest little Higgs scalar in the near-brane of SU(3) x SU(3)x U(1). The latter produces SU(3) VEVs and simplest little-like Higgs after triplet-triplet splitting and, under quadratic-based and non-quadratic-based Coleman-Weinberg potential, the simplest little-like Higgs yields exotic Higgses, scalar-pair and 3-scalar Higgses in the so-called one-by-one and collective breakings. A generalized non-quadratic-based Coleman-Weinberg potential utilizing a NGB-like scalar produces NGB-dual Higgses with a squared mass relevant to the components of a 3-scalar Higgs that further create a duality of 3-scalar Higgs and NGB-dual Higgses. This is due to a double-vacua property such that each vacuum responds equally to the shifts happening at either non-zero or zero-VEV vacuum.
Source Processes of the March 2007 Singkarak Earthquakes Inferred from Teleseismic Data A. Afnimar; Reiji Kobayashi; Danny Hilman Natawidjaja
Journal of Mathematical and Fundamental Sciences Vol. 46 No. 2 (2014)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2014.46.2.4

Abstract

The rupture processes of two sequentialearthquakes have been inverted from teleseismic data. The first event released a total seismic moment of 7.9×1018 Nm (Mw 6.5) and the slip distribution shows three asperities, 1.5 m at the shallowside, 0.7 m at the rightsouth-east deep side and 0.5 m atthe north-west deep side. The second event had one asperity with 1.7 m slip and released a seismic moment of 7.5×1018 Nm (Mw 6.5). In both cases, maximum slip occurred above the hypocenter which was responsible for the surface displacement pattern.
A Method for Producing Bioethanol from the Lignocellulose of Shorea uliginosa Foxw. by Enzymatic Saccharification and Fermentation Wahyu Dwianto; F. Fitria; Ika Wahyuni; Danang Sudarwoko Adi; Sri Hartati; Rumi Kaida; Takahisa Hayashi
Journal of Mathematical and Fundamental Sciences Vol. 46 No. 2 (2014)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2014.46.2.5

Abstract

Several papers have reported various technical aspects of lignocellulosic bioethanol production. Recalcitrance to saccharification is a major limitation for conversion of lignocellulosic biomass to ethanol. The biological process for converting lignocellulose to fuel ethanol includes delignification in order to liberate cellulose and hemicelluloses, depolymerization of carbohydrate polymers to produce free sugars, and sugar fermentation to produce ethanol. Access of plant cell wall polysaccharides to chemical, enzymatic and microbial digestion is limited by many factors, including the presence of lignin and hemicellulose that cover cellulose microfibrils. An effort to support the fuel ethanol fermentation industry using the Indonesian woody plant species Shorea uliginosa Foxw., was undertaken with regard to the established efficient bioethanol production process. This paper relates to a method for producing bioethanol from the lignocellulose of S. uliginosa Foxw. by saccharification and fermentation of xylem. A literature study of previous research on cellulose hydrolysis as a method for producing bioethanol was necessary. The objective of this study was to gain a deeper understanding of the degradation mechanisms of cellulose by enzymes through a study of previous research, which were then compared to the new method.
Effect of Furnish on Temperature and Vapor Pressure Behavior in the Center of Mat Panels during Hot Pressing Muhammad Navis Rofii; Noriko Yamamoto; Yoichi Kojima; Shigehiko Suzuki
Journal of Mathematical and Fundamental Sciences Vol. 46 No. 2 (2014)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2014.46.2.6

Abstract

Particleboard achieves its overall performance characteristics during hot pressing process. As this process is influenced by several factors, particularly temperature and pressure, it is very important to understand the behavior of both. This study investigates the effects of furnish materials on temperature and vapor pressure behavior inside particleboard mat panels during hot pressing. Strand type particles from hinoki and ring-flaker recycled wood particles were used as furnish for laboratory-scale particleboard panels with a target density of 0.76 g/cm³. Mat panels with a moisture content of about 10% were hot pressed at a platen temperature of 180°C and an initial pressure of 3 MPa until the mat center reached the same temperature as the platen. A press monitoring device (PressMAN Lite) was used for detecting the temperature and vapor pressure change in the center of the mat panels. The study showed that the furnish type affected the temperature and vapor behavior inside the mat panels. Particleboard made of hinoki strand resulted in a longer plateau time, a higher plateau temperature and a higher gas pressure generated during hot pressing than those of ring-flaker recycled wood particles. Mixed board resulted in values between those of the two other furnish materials.
Modeling Haze Problems in the North of Thailand using Logistic Regression Busayamas Pimpunchat; Khwansiri Sirimangkhala; Suwannee Junyapoon
Journal of Mathematical and Fundamental Sciences Vol. 46 No. 2 (2014)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2014.46.2.7

Abstract

At present, air pollution is a major problem in the upper northern region of Thailand. Air pollutants have an effect on human health, the economy and the traveling industry. The severity of this problem clearly appears every year during the dry season, from February to April. In particular it becomes very serious in March, especially in Chiang Mai province where smoke haze is a major issue. This study looked into related data from 2005-2010 covering eight principal parameters: PM10 (particulate matter with a diameter smaller than 10 micrometer), CO (carbon monoxide), NO2 (nitrogen dioxide), SO2 (sulphur dioxide), RH (relative humidity), NO (nitrogen oxide), pressure, and rainfall. Overall haze problem occurrence was calculated from a logistic regression model. Its dependence on the eight parameters stated above was determined for design conditions using the correlation coefficients with PM10. The proposed overall haze problem modeling can be used as a quantitative assessment criterion for supporting decision making to protect human health. This study proposed to predict haze problem occurrence in 2011. The agreement of the results from the mathematical model with actual measured PM10 concentration data from the Pollution Control Department was quite satisfactory.
Analysis of MaACS2, a stress-inducible ACC Synthase Gene in Musa acuminata AAA Group Cultivar Pisang Ambon Resnanti Utami Handayani; Fenny M. Dwivany
Journal of Mathematical and Fundamental Sciences Vol. 46 No. 2 (2014)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2014.46.2.8

Abstract

Ethylene  has  an important function in plant growth and development. Ethylene  production  generally  increases  in  response  to  pathogen  attacks  and other  environmental  stress  conditions.  The  synthesis  of  this phytohormone  is regulated  by  two  enzymes,  ACC  synthase  (ACS)  and  ACC  oxidase  (ACO).  ACC synthase is encoded by a multigene  that  regulates  the  production  of ACC, after  which  this  precursor  is  converted  into  ethylene  by  ACO.  Pisang  Ambon (Musa  sp. AAA group), a banana cultivar originating from Indonesia, has nine ACS genes (MaACS  1-9) and one ACO gene (MaACO).  One  of  the  banana  ACS genes,  MaACS2,  is  stress-inducible.  In  this  research,  we  have  investigated  the expression  profile  of  MaACS2  in  the  roots  and  leaf  tissues  of  infected  tissue culture  plants.  Quantification  of  gene  expression  was analyzed using Real-Time PCR (qPCR) using  Ma18srRNA  and  MaGAPDH  as reference genes.  The results showed  nine-to  ten  fold  higher  MaACS2  expression  levels in  the  infected  roots tissues  compared to  the  uninfected roots  tissues. However,  MaACS2 expression in the leaves was only detected in infected tissue.
Cover Vol. 46, No. 2 (2014) Journal of Mathematical and Fundamental Sciences
Journal of Mathematical and Fundamental Sciences Vol. 46 No. 2 (2014)
Publisher : Institute for Research and Community Services (LPPM) ITB

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

Abstract

Page 1 of 1 | Total Record : 9

 1 

Filter by Year

2014 2014


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