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Ditemukan 16878 dokumen yang sesuai dengan query
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Mohamed El-Sakhawy
"The antimicrobial properties of bagasse paper sheets coated with
natural polymers (chitosan, different ratios of (gelatin/glycerol) + chitosan,
hemicellulose, hemicellulose + glycerol, hemicellulose+chitosan) or
synthetic organophosphorus dimer compounds were evaluated in this work.
Hemicelluloses showed moderate activity against Bacillus subtilis and Candida albicans, while chitosan showed weak
activity against B. subtilis. The condition that offered the highest inhibitory
activity of bagasse paper was the one
coated with 1,3-diaryl-2,2,2,4,4,4-hexachlorocyclodiphosph(V)azane
(where aryl is p-chloroaniline or p-anisidine). The developed bagasse papers
were evaluated against Gram-positive bacteria, Gram-negative bacteria, yeasts, and fungi. The highest inhibitory activity was obtained at a concentration of 200
mg/mL for p-chloroaniline with an inhibition zone that varied for different
microbes from 6.9 mm to 26 mm. The highest inhibitory activity was obtained at
300?250 mg/mL for p-anisidine against most of the pathogenic microorganisms
with an inhibition zone that varied for different microbes from 8 mm to 14.75
mm. The observed antimicrobial and antifungal activity properties for bagasse paper coated with 1,3-diaryl
2,2,2,4,4,4-hexachlorocyclodiphosph(V)azane could be attributed to the presence of Cl, P atoms, and the lone pair of
electrons on N atoms in the structure of the dimers."
2016
J-Pdf
Artikel Jurnal  Universitas Indonesia Library
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Mohamed El-Sakhawy
"The antimicrobial properties of bagasse paper sheets coated with natural polymers (chitosan, different ratios of (gelatin/glycerol) + chitosan, hemicellulose, hemicellulose + glycerol, hemicellulose+chitosan) or synthetic organophosphorus dimer compounds were evaluated in this work. Hemicelluloses showed moderate activity against Bacillus subtilis and Candida albicans, while chitosan showed weak activity against B. subtilis. The condition that offered the highest inhibitory activity of bagasse paper was the one coated with 1,3-diaryl-2,2,2,4,4,4 hexachlorocyclodiphosph(V)azane (where aryl is p-chloroaniline or p-anisidine). The developed bagasse papers were evaluated against Gram-positive bacteria, Gram-negative bacteria, yeasts, and fungi. The highest inhibitory activity was obtained at a concentration of 200 mg/mL for p-chloroaniline with an inhibition zone that varied for different microbes from 6.9 mm to 26 mm. The highest inhibitory activity was obtained at 300–250 mg/mL for p-anisidine against most of the pathogenic microorganisms with an inhibition zone that varied for different microbes from 8 mm to 14.75 mm. The observed antimicrobial and antifungal activity properties for bagasse paper coated with 1,3-diaryl 2,2,2,4,4,4-hexachlorocyclodiphosph(V)azane could be attributed to the presence of Cl, P atoms, and the lone pair of electrons on N atoms in the structure of the dimers."
Depok: Faculty of Engineering, Universitas Indonesia, 2016
UI-IJTECH 7:6 (2016)
Artikel Jurnal  Universitas Indonesia Library
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Mohamed El-Sakhawy
"The antimicrobial properties of bagasse paper sheets coated with natural polymers (chitosan, different ratios of (gelatin/glycerol) + chitosan, hemicellulose, hemicellulose + glycerol, hemicellulose+chitosan) or synthetic organophosphorus dimer compounds were evaluated in this work. Hemicelluloses showed moderate activity against Bacillus subtilis and Candida albicans, while chitosan showed weak activity against B. subtilis. The condition that offered the highest inhibitory activity of bagasse paper was the one coated with 1,3-diaryl-2,2,2,4,4,4- hexachlorocyclodiphosph(V)azane (where aryl is p-chloroaniline or p-anisidine). The developed bagasse papers were evaluated against Gram-positive bacteria, Gram-negative bacteria, yeasts, and fungi. The highest inhibitory activity was obtained at a concentration of 200 mg/mL for p-chloroaniline with an inhibition zone that varied for different microbes from 6.9 mm to 26 mm. The highest inhibitory activity was obtained at 300–250 mg/mL for panisidine against most of the pathogenic microorganisms with an inhibition zone that varied for different microbes from 8 mm to 14.75 mm. The observed antimicrobial and antifungal activity properties for bagasse paper coated with 1,3-diaryl 2,2,2,4,4,4 hexachlorocyclodiphosph(V)azane could be attributed to the presence of Cl, P atoms, and the lone pair of electrons on N atoms in the structure of the dimers."
Depok: Faculty of Engineering, Universitas Indonesia, 2016
UI-IJTECH 7:6 (2016)
Artikel Jurnal  Universitas Indonesia Library
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Alvin Prayuda Juniarta Dwiyantoro
"The routine daily
activities that tend to be sedentary and repetitive may cause severe health
problems. This issue has encouraged researchers to design a system to detect
and record people activities in real time and thus encourage them to do more
physical exercise. By utilizing sensors embedded in a smartphone, many research
studies have been conducted to try to recognize user activity. The most common
sensors used for this purpose are accelerometers and gyroscopes; however, we
found out that a gravity sensor has significant potential to be utilized as
well. In this paper, we propose a novel method to recognize activities using
the combination of an accelerometer and gravity sensor. We design a simple
hierarchical system with the purpose of developing a more energy efficient
application to be implemented in smartphones. We achieved an average of 95% for
the activity recognition accuracy, and we also succeed at proving that our work
is more energy efficient compared to other works."
2016
J-Pdf
Artikel Jurnal  Universitas Indonesia Library
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Tubagus Mohammad Akhriza
"One main problem that must be coped with by a
telecommunication company (Telco) is the connection interference experienced by
customers. When a cell phone number Pn in a region R suffers from
a connection problem, the first step commonly taken by that Telco?s technician
is to find the base transceiver station (BTS) among existing BTSs in R
that is currently covering Pn. However, the proprietary tools used to
locate the covering BTS can usually be accessed only from the regional office?s
intranet with a specific IP address. Alternatively, a technician can use telnet
to log in to a mobile switching center (MSC) server and search to determine
whether Pn is being attached in a BTS that is registered in the related
MSC server. However, this method is exhausting and inefficient because an MSC
server usually registers hundreds to thousands of BTSs. This article proposes
improving the efficiency, mobility, and interoperability of BTS
location-finding by making use Telegram?s bot and command-line interfaces.
Mobility and interoperability are improved because the proposed method can run
both on PCs and smartphones. The proposed method is investigated experimentally
at Telkomsel Ltd., a known Telco in Indonesia. This method requires only 30
seconds to locate the covering BTS, which is 20 times and four to seven times
faster than manual telnet and the proprietary tool, respectively."
2017
J-Pdf
Artikel Jurnal  Universitas Indonesia Library
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Fredina Destyorini
"The gas diffusion layer (GDL) is one of the critical components of a proton exchange membrane fuel cell (PEMFC). It is generally made of a fossil-fuel-based carbon material. In this study, carbon composite paper (CCP) for GDL was prepared by using carbon material obtained from coconut coir. To obtain the CCP, 80 wt% carbon material from the coconut coir and 20 wt% polymer binder (ethylene vinyl acetate and polyethylene glycol) were mixed in xylene solvent at 100°C, cast on molded glass, and then rolled. The carbon material consists of a mixture of carbon fibers (length: 2 mm) and powders (size: 74 µm). Subsequently, the CCP was treated with polytetrafluoroethylene solution (10 wt%). The physical properties of the CCPs, such as through-plane electrical conductivity, porosity, density, and hydrophobic properties, were investigated. Scanning electron microscopy and energy-dispersive spectroscopy mapping were used to analyze the morphology and polytetrafluoroethylene (PTFE) distribution in the CCP. The through-plane conductivity test showed that CCP with 70 wt% carbon fiber, 10 wt% carbon powder, and 20 wt% polymer was the optimum sample, and it showed the highest electrical conductivity of 2.22 S cm-1. The physical properties of PTFE-treated CCP, such as porosity, density, and contact angle, were almost similar to that of commercial carbon paper used as a GDL. Therefore, the CCP prepared from coconut coir can be applied as a GDL in a PEMFC."
2016
J-Pdf
Artikel Jurnal  Universitas Indonesia Library
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Apichat Janpila
"To
develop seismic design criteria for buildings, seismic hazard analysis is required to estimate the ground motion
intensity with criteria such as peak ground
acceleration (PGA). The seismic hazard can be analyzed by using two approaches: deterministic seismic hazard analysis (DSHA) and
probabilistic seismic hazard analysis (PSHA). In these two approaches, the
seismic hazard is evaluated from past earthquake events and active faults data. In Thailand, seismic hazard is classified in the low lying regions; however, in recently years,
earthquakes have occurred frequently in the North of Thailand. To
prevent and reduce damage due to earthquakes in the future, determination
of seismic hazard is needed. This
research proposes a deterministic seismic hazard
map evaluated from nineteen
active faults affecting
Thailand. Two types of active faults are considered: first, an active fault in a subduction zone and second, a crustal fault. The seismic hazard is evaluated by using a ground
motion prediction equation (GMPEs). Four GMPEs are weighted equally for
seismic crustal fault, and two GMPEs are weighted equally for
a seismic subduction zone. The hypocentral distance is
used to evaluate the seismic hazard for all ground motion prediction equations.
The Northern part and the Western part of Thailand are high seismic hazard
regions, because there are active faults with the large possibility of earthquakes of a maximum magnitude. The seismic
hazards in the North, West and Northeast of Thailand are about 0.60 g.
The seismic hazard in Bangkok is about 0.25 g due to the Three Pagoda fault and Sri Sawat fault. The seismic hazard in the South of Thailand is about 0.40 g."
2016
J-Pdf
Artikel Jurnal  Universitas Indonesia Library
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Abdul Azis Abdillah
"Diabetes is one of the
most serious health challenges in both developed and developing countries. Early detection and accurate diagnosis of
diabetes can reduce the risk of complications. In recent years, the use of machine learning in predicting disease has
gradually increased. A promising classification technique in machine
learning is the use of support vector machines in combination with radial basis
function kernels (SVM-RBF). In this study, we used SVM-RBF to predict diabetes.
The study used a Pima Indian diabetes dataset from the University of
California, Irvine (UCI) Machine Learning Repository. The subjects were female and
≥ 21 years
of age at the time of the index examination. Our experiment design used 10-fold
cross-validation. Confusion matrix and ROC were used to calculate performance
evaluation. Based on the experimental results, the study demonstrated that SVM-RBF
shows promise in aiding diagnosis of Pima Indian diabetes disease in the early
stage."
2016
J-Pdf
Artikel Jurnal  Universitas Indonesia Library
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Warjito
"Batik waste can increase water characteristics, such as turbidity, color
and total suspended solids (TSS). Thus, an efficient technique for separating
Batik from the liquid to decrease these characteristics is needed. The aim of
the current study was to understand the results of flotation using electrolysis
and to investigate the bubble characteristics that influence the results of the
flotation of Batik waste. Flotation studies have been conducted using
electrolysis to produce bubbles to separate batik synthetic dye from the
liquid. Research conducted with 316L stainless steel electrodes, inside a 100
cm tall acrylic pipe with an inner diameter of 8.4 cm and a voltage variation
of 10, 15 and 20 V. Batik waste was mixed with distilled water. Commercial alum
powder [aluminum sulfate, Al2(SO4)3.14H2O,
that is 17% Al2O3] as the reagent was added to coagulate
Batik waste in a ratio of 1 gram per 10 ml of Batik waste. The results showed
that flotation of Batik waste can be used to separate Batik waste with the
addition of alum. Alum was shown to be capable of acting as a collector in this
type of waste separation. The results showed that flotation using electrolysis
could be an effective method for reducing turbidity, color and TSS."
2016
J-Pdf
Artikel Jurnal  Universitas Indonesia Library
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L. Aruna
"Federated Cloud Architecture is a heterogeneous and distributed model that provides
infrastructures related to the cloud by aggregating different Infrastructure-as-a-Service (IaaS) providers. In this case, it is an exciting task to
select the optimal service cloud provider for the customer and then deploy it. In this paper,
a new provider discovery
algorithm and fuzzy sets ranking model is proposed in the modified federated
architecture and then
the performance is
evaluated. The proposed
discovery method shortlists the provider based on the Quality of Service (QoS)
indicators suggested by the Service Measurement Index (SMI) with the Service Level
Agreement (SLA) that
provides improved performance. In addition to that, the cost is also included that
represents the
fulfillment at the level of the end user. The ranking mechanism is based on a Fuzzy set approach, having three general phases, such as problem decomposition, judgment of
priorities and an aggregation
of these priorities. With some simple rules, the fuzzy set may be combined with the QoS indicators. The Weighted
Tuned Queuing Scheduling (WTOS) Algorithm is proposed to resolve the issue of starvation in the
existing architecture and manage the requests effectively. Experimental results
show that the proposed
architecture has a
better successful selection rate, average response time and less overhead,
compared to the existing architecture that had supported the Cloud environment."
2016
J-Pdf
Artikel Jurnal  Universitas Indonesia Library
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