4,459 research outputs found
Algebraic grid adaptation method using non-uniform rational B-spline surface modeling
An algebraic adaptive grid system based on equidistribution law and utilized by the Non-Uniform Rational B-Spline (NURBS) surface for redistribution is presented. A weight function, utilizing a properly weighted boolean sum of various flow field characteristics is developed. Computational examples are presented to demonstrate the success of this technique
Meningkatkan Kemampuan Siswa Kelas V SD Inpres Mayayap Dalam Menulis Karangan Narasi Melalui Model Pembelajaran Kooperatif
Kesulitan dalam menemukan ide, menuangkan ide, mengembangkan ide dan merangkai kata atau kalimat dengan tepat menjadi masalah yang mendasar bagi siswa kelas V SD Inpres Mayayap dalam menulis karangan narasi. Tujuan penelitian ini adalah untuk mengetahui penggunaan model pembelajaran kooperatif dalam meningatkan kemampuan siswa kelas V menulis karangan narasi di SD Inpres Mayayap. Populasi dalam penelitian adalah siswa kelas V SD Inpres Mayayap (hanya 1 kelas) yang berjumlah 20 orang. Hasil penelitian menunjukkan bahwa aktivitas guru dan siswa mengalami peningkatan yang cukup berarti dari siklus I ke siklus II dan untuk analisis tes akhir tindakan dari siklus I ke siklus II terjadi juga peningkatan belajar klasikal sebesar 40% yaitu 55% pada siklus I menjadi 95% pada siklus II. Berdasarkan hasil tersebut dapat disimpulkan bahwa dengan model pembelajaran kooperatif dapat meningkatkan kemampuan siswa kelas V SD Inpres Mayayap dalam menulis Karangan Narasi
Einstein's mirror revisited
We describe a simple geometrical derivation of the formula for reflection of
light from a uniformly moving plane mirror directly from the postulates of
special relativity.Comment: 4 pages, 5 figures, RevTeX4, comments welcome; V2: corrected Fig. 5
and the discussion associated with it, co-author include
() spectroscopy using Cornell potential
The mass spectra and decay properties of heavy quarkonia are computed in
nonrelativistic quark-antiquark Cornell potential model. We have employed the
numerical solution of Schr\"odinger equation to obtain their mass spectra using
only four parameters namely quark mass (, ) and confinement strength
(, ). The spin hyperfine, spin-orbit and tensor
components of the one gluon exchange interaction are computed perturbatively to
determine the mass spectra of excited , , and states. Digamma,
digluon and dilepton decays of these mesons are computed using the model
parameters and numerical wave functions. The predicted spectroscopy and decay
properties for quarkonia are found to be consistent with available experimental
observations and results from other theoretical models. We also compute mass
spectra and life time of the meson without additional parameters. The
computed electromagnetic transition widths of heavy quarkonia and mesons
are in tune with available experimental data and other theoretical approaches
Optical Non-Contact Railway Track Measurement with Static Terrestrial Laser Scanning to Better than 1.5mm RMS
The railway industry requires track to be monitored for a variety of reasons, particularly when
any type of physical works take place within the vicinity of the asset (e.g. demolition,
construction and redevelopment works). Terrestrial laser scanning (TLS) has considerable
potential as a survey method for rail measurement due to its non-contact nature and
independence from physical targeting at track level. The consensus from recently published
work using static terrestrial laser scanning is that rail measurements to the order of 3mm RMS
are routinely possible. Such measures are appropriate for extracting the gauge, cant and twist
parameters required by the rail industry, however engineering specifications designed to
ensure safe and comfortable running of the trains ideally require measurements of better
quality.
This paper utilises standard design rail profiles from the UK industry to optimise the way in
which TLS point cloud data are fitted to the rail geometry. The work is based on the use of off
the shelf phase-based TLS systems each capable of delivering single point measurements of
the order of 5mm to cooperative surfaces. The paper describes a workflow which focuses the
fitting process onto discrete planar rail elements derived from the design rail geometry. The
planar fitting process is improved through understanding how data from these scanners
respond to rail surfaces. Of particular importance is the removal of noisy data from the shiny
running surfaces.
Results from a sequence of multi-station TLS surveys of the same set of double tracks taken
from platform level highlight the capability to obtain fits to the rail model of better than
1.5mm RMS. Whilst fitting can be carried out on a single side of a rail, the paper highlights the challenge of obtaining an accurate TLS registration necessary to extract both sides of each rail to the same level of accuracy. This configuration is proven over inter-TLS instrument separations of the order of 30m and demonstrates the TLS network coverage necessary to
achieve such results even in the presence of an occluding electric third rail
PYRIMIDINE INCORPORATED SCHIFF BASE OF ISONIAZID WITH THEIR SYNTHESIS, CHARACTERIZATION AND IN VITRO BIOLOGICAL EVALUATION
  Objective: Versatile biological activities of nitrogen containing heterocycles in medicinal chemistry, mainly pyrimidine and pyridine ring based heterocyclic moieties are very important. Pharmaceutical important of pyrimidine and isoniazid moiety prompted us to synthesize isoniazid clubbed pyrimidine derivatives and evaluated for antimicrobial and antituberculosis activity.Method: 2-(2-(3-bromo benzylidene)-1-isonicotinoyl hydrazinyl)-N-(4-(substituted phenyl)-6-(substituted aryl) pyrimidin-2-yl) acetamide 2(A-J) have been synthesized by condensation reaction of 2-chloro-N-[4-(substituted phenyl)-6-(substituted aryl) pyrimidin-2-yl] acetamide and N'-[(E)- (3-bromophenyl) methylidene]pyridine-4-carbohydrazide. All newly synthesized compounds were screened for in vitro antibacterial activity against Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, and Staphylococcus pyogenes, antifungal against Candida albicans, Aspergillus niger, and Aspergillus clavatus, and antituberculosis activity against Mycobacterium tuberculosis H37RV.Results: Majority of the compounds exhibited good antibacterial, antifungal, and antituberculosis activity. All titled compounds were characterized by spectral analyses (infrared spectroscopy, nuclear magnetic resonance spectroscopy, and mass spectroscopy).Conclusion: 2-(2-(3-bromo benzylidene)-1-isonicotinoyl hydrazinyl)-N-(4-(substituted phenyl)-6-(substituted aryl) pyrimidin-2-yl) acetamide 2(A-J) showed good antimicrobial activity and comparatively good antituberculosis activity. Hence, all the compounds of this series considered for future investigation mainly in area of antibacterial, antifungal study
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