8,085 research outputs found
Spherically Symmetric Gravitational Collapse
In this paper, we discuss gravitational collapse of spherically symmetric
spacetimes. We derive a general formalism by taking two arbitrary spherically
symmetric spacetimes with . Israel's junction conditions are used to
develop this formalism. The formulae for extrinsic curvature tensor are
obtained. The general form of the surface energy-momentum tensor depending on
extrinsic curvature tensor components is derived. This leads us to the surface
energy density and the tangential pressure. The formalism is applied to two
known spherically symmetric spacetimes. The results obtained show the regions
for the collapse and expansion of the shell.Comment: 12 pages, 4 figures, accepted for publication in Mod. Phys. Lett.
The Refined Topological Vertex
We define a refined topological vertex which depends in addition on a
parameter, which physically corresponds to extending the self-dual graviphoton
field strength to a more general configuration. Using this refined topological
vertex we compute, using geometric engineering, a two-parameter (equivariant)
instanton expansion of gauge theories which reproduce the results of Nekrasov.
The refined vertex is also expected to be related to Khovanov knot invariants.Comment: 70 Pages, 23 Figure
Carbon Nanotube Reinforced High Density Polyethylene Materials for Offshore Sheathing Applications
Multiwall carbon nanotube (CNT)-filled high density polyethylene (HDPE) nanocomposites were prepared by extrusion and considered for their suitability in the offshore sheathing applications. Transmission electron microscopy was conducted to analyse dispersion after bulk extrusion. Monolithic and nanocomposite samples were subjected to accelerated weathering and photodegradation (carbonyl and vinyl indices) characterisations, which consisted of heat, moisture (seawater) and UV light, intended to imitate the offshore conditions. The effects of accelerated weathering on mechanical properties (tensile strength and elastic modulus) of the nanocomposites were analysed. CNT addition in HDPE produced environmentally resilient nanocomposites with improved mechanical properties. The energy utilised to extrude nanocomposites was also less than the energy used to extrude monolithic HDPE samples. The results support the mass substitution of CNT-filled HDPE nanocomposites in high-end offshore applications
A New Triple-Switch-Triple-Mode High Step-Up Converter with Wide Range of Duty Cycle for DC Microgrid Applications
Sistem Informasi Geografis (SIG) untuk Zonasi Daerah Bahaya Kerusakan Bangunan Akibat Gempa Bumi: Studi Kasus pada Kota Banda Aceh dan Sekitarnya
This study aims to develop a geographic information system software that has the ability to develop hazard area zoning of building damage due to earthquake, especially in Banda Aceh and the surrounding areas using peak ground acceleration (PGA) value approach. Analysis and design methods are implemented in this study. The analytical method consists of two stages, namely seismic data collection period 1973 - 2011 by magnitude more than 5 on the Richter scale and the calculation of earthquake acceleration on bedrock using the attenuation function of Crouse. The design method comprises several structured stages, which are designing: data flow diagram (DFD), entity relationship diagram (ERD), menus, screens, and state transition diagrams (STD). The main conclusions of this study is that a GIS -based local zoning of earthquake hazard risk can be built and developed with calculation and classification approach of the peak ground acceleration (PGA). In addition, there is a relationship significant spatial found by comparing the results with the zoning patterns of building damage in the earthquake of 2004
Effect of various nutrient combinations on growth and body composition of rohu (Labeo rohita)
A total of 80 Labeo rohita fingerlings (mean body weight, 14.7 ± 0.08 g and length, 11.0 ± 0.16 cm) were randomly distributed into four treatments with 20 replicates each, for 60 days, to determine the effect of different feed compositions on the growth and body composition of L. rohita. Four isoenergetic (17.05 ± 0.24 kJ g-1) experimental diet viz., control (C), protein rich (PR), fat rich (FR) and carbohydrate rich (CR) were formulated. The proximate composition protein/fat/carbohydrate (P/F/C) of formulated feed were C: P35/F8/C2, PR: P40/F8/C2, FR: P35/F10/C2 and CR: P35/F8/C5. The daily ration size was 5% of fish body weight. The result reveals a highly significant (Pâ€0.001) difference in specific growth rate (SGR), weight gain (WG) and protein efficiency (PE) among four feeding groups, while differences were significant for feed conversion ratio (FCR). FR showed maximum growth together with high body fat, CR showed low body fat and high proteins. Results indicate that increasing fat up to 9% in diet showed better growth as compared to increasing dietary protein and carbohydratesKey words: Labeo rohita, diet composition, specific growth rate, protein efficiency, body composition
Context aware ontologyâbased hybrid intelligent framework for vehicle driver categorization
In public vehicles, one of the major concerns is driver's level of expertise for its direct proportionality to safety of passengers. Hence, before a driver is subjected to certain type of vehicle, he should be thoroughly evaluated and categorized with respect to certain parameters instead of only oneâtime metric of having driving license. These aspects may be driver's expertise, vigilance, aptitude, experience years, cognition, driving style, formal education, terrain, region, minor violations, major accidents, and age group. The purpose of this categorization is to ascertain suitability of a driver for certain vehicle type(s) to ensure passengers' safety. Currently, no driver categorization technique fully comprehends the implicit as well as explicit characteristics of drivers dynamically. In this paper, machine learningâbased dynamic and adaptive technique named DâCHAITs (driver categorization through hybrid of artificial intelligence techniques) is proposed for driver categorization with an objective focus on driver's attributes modeled in DriverOntology. A supervised mode of learning has been employed on a labeled dataset, having diverse profiles of drivers with attributes pertinent to drivers' perspectives of demographics, behaviors, expertise, and inclinations. A comparative analysis of DâCHAIT with three other machine learning techniques (fuzzy logic, caseâbased reasoning, and artificial neural networks) is also presented. The efficacy of all techniques was empirically measured while categorizing the drivers based on their profiles through metrics of accuracy, precision, recall, Fâmeasure performance, and associated costs. These empirical quantifications assert DâCHAIT as a better technique than contemporary ones. The novelty of proposed technique is signified through preprocessing of feature attributes, quality of data, training of machine learning model on more relevant data, and adaptivity
This is the peer reviewed version of the following article: Context aware ontologyâbased hybrid intelligent framework for vehicle driver categorization, which has been published in final form at https://doi.org/10.1002/ett.3729. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions
Pengaruh Tingkat Pertumbuhan Ekonomi, Pendapatan Asli Daerah, Ukuran Pemerintah Daerah, Belanja Modal, dan Jumlah Penduduk terhadap Kelemahan Pengendalian Intern pada Pemerintah Daerah (Studi Empiris pada Kabupaten dan Kota Provinsi Riau dan Sumatera Bara
The research aims to analyze of economic growth rate, locally-generated revenue, government size, capital expenditure and population to the weakness of internal control. Object of this research areRiau and Sumatera Barat Province. That data are analyzed by linear regression method and SPSS program version 19. The variables were examined economic growth rate, locally-generated revenue, government size, capital expenditure and population to the weakness of internal control. The results of this research showedeconomic growth rate has an effect tothe weakness of internal control with 0,048 significance, locally-generated revenuehas an effect tothe weakness of internal control with 0,012 significance, government sizehas an effect tothe weakness of internal controlwith 0,009 significance, capital expenditure has no effect tothe weakness of internal control with 0,607 significance and population has an effect tothe weakness of internal control with 0,037 significance The results of this research also showed that coefficient R square is 81,9%. Each independent variables, gives the strong influence to dependent variable, it means independents variables could explain dependent variable well. While the remaining influenced by other variables not included in the regression models were not included in this study. All variables also have strong relation with variable dependents in this research
PROSES PE WARISAN SENI TARAWA NGS A SANGGAR SUNDA LUGINA PADA GENERASI MUDA RANCAKALONG SUMEDANG. IQBAL ARIEF INSANI 1 0 60400 59
â
Proses Pewarisan
Seni
Tarawangsa
Sanggar Sunda Lugina Pada Generasi Muda
Rancakalong
Sumedang
â
.
Pe
nelitian ini bertujuan untuk mengetahui
permasalahan
tentang kesenian khas kota tahu Sumedang, yaitu tarawangsa. Dalam tiga
tahun yang
lalu
tarawangsa kehilangan regenerasi dan dikhawatirkan kehilangan eksistensinya
.
Penelitian ini
berfokus pada
saat
prosesi pertunjukan
pada bulan mulud
, pelatihan
dan
peran serta generasi muda Rancakalo
ng terhadap kesenian tarawangsa.
dan untuk
mengetahui proses pewarisan
seni tarawangsa
yang dilakukan oleh sanggar
tarawangsa Sunda Lugina pimpinan b
apak Pupung Supena
.
Tarawangsa
sebagai
karya
intelektual
seni
musi
k
khas
Rancakalong
pada
khusunya
dan
Sumedang
pada
umumnya
, memberikan
andil
mengangkat
nilai
s
eni
budaya
Sumedang,
t
arawangsa
oleh
sebagian
pengama
t
seni
kabupaten
Sumedang
dianggap
sebagai
musik
identitas
dan
jati
diri
Kota Tahu
tersebut
. Beragamnya
seni
t
arawangsa
yang terus
berubah
dan
berkembang di masyarakat
luas, dikhawatirkan
mengurangi
fungsi
identitas,
serta
mengalami
perubahan
bentuk yang akhirnya
bukan
mustahil
akan
semakin
jauh
dan
kehilangan
bentuk
aslinya.
D
alam
skripsi
ini
membahas
tentang
proses
yang
dilakukan
bapak
Pupung
di sanggar
Sunda Lugina
untuk
mewariskan
seni
tradisi
kepada generasi muda Rancakalong
.
Penelitian
ini
menggunakan
jenis
penelitian
kualitatif, metode
yang digunakan
pada
peneliti
an
ini
adalah
metode
etnografi
.
Berdasarkan
hasil
penelitian, peneliti
dapat
menyimpulkan
bahwa
proses
yang
dilakukan
oleh
bapak
Pupung
di sanggar
Sunda Lugina
untuk
mewariskan
kesenian
t
arawangsa
terhadap generasi muda
Rancakalong
,
meliputi
tiga
point diantar
anya
:
1)
Merutinkan
latihan
t
arawangsa
kepada
generasi
muda
di
sanggarnya
, 2
)
Mendirikan
sanggar untuk menjadikan tempat pertunj
ukan, pelatihan pada generasi muda
Rancakalong
3) Mengajak atau mengikut sertakan
generasi muda dalam
pertunjukan
seni
t
arawangsa
saat
hajatan
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