57,428 research outputs found
Studi Perencanaan Industri Sari Buah Jambu Mete
No full textPengembangan jambu mete d i Indonesia dilaksanakan dalam rangka meningkatkan lapangan kerja dan pendapatan petani di lahan beriklim kering, peningkatan ekspor komoditi ja&u mete, s e r t a r e h a b i l i t a s i lahan k r i t i s melalui penghijauan dan konservasi tanah dan a i r d i daerah peka erosi. Oleh karena i t u perkembangan luas areal perkebunan jambu mete meningkat, rata-rata 6.59 % per tahun. Perluasan a r e a l perkebunan tersebut meningkatkan pula produksi jambu mete, rata-rata 6.60% per tahun. Walaupun demikian pemanfaatan h a s i l tanaman jambu mete hanya terbatas pada mete gelondongnya, sedangkan pemanfatan jambunya masih r e l a t i f sedikit bahkan dibuang sebagai limbah
Odstupanja raspodjele dijelova mete u sudarima miona s jezgrama na (420 ± 45) GeV
No full textThis paper presents an analysis of angular distribution of target fragments in lepton nucleus interactions in terms of scaled factorial moments (SFMs) in one-dimensional space. A power-law type behaviour of normalised scaled factorial moments, popularly known as \u27intermittency\u27, is expressed with a decreasing phase space. Our data of target fragments reveal a similar type of increase in SFMs with decreasing bin width of the angular distribution in muon-nucleus interactions at (420±45) GeV. The new observation contradicts the existing concept of the evaporation model that the statistical equilibrium is reached before the emission of fragmented particles from residual target nuclei at high-energy nuclear interactions.Predstavljamo analizu kutne raspodjele dijelova mete u sudarima leptona s jezgrama pomoću sukladnih faktorijalnih momenata (SFM) u jednodimenzijskom prostoru. Sa smanjenjem faznog prostora dolazi do izražaja potencijalna ovisnost normaliziranih sukladnih faktorijalnih momenata, koja se obično naziva “odstupanjem raspodjele” (intermittency). Naši podaci za dijelove mete pokazuju slično povećanje SFM-ova kada se smanjuju intervali kutne raspodjele sudara mion–jezgra na (420±45) GeV. Ova su opažnja suprotna prevladavajućoj zamisli modela isparavanja prema kojoj se statistička ravnoteža postiže prije emisije otkinutih dijelova mete u sudarima na visokim energijama
Odstupanja raspodjele dijelova mete u sudarima miona s jezgrama na (420 ± 45) GeV
No full textThis paper presents an analysis of angular distribution of target fragments in lepton nucleus interactions in terms of scaled factorial moments (SFMs) in one-dimensional space. A power-law type behaviour of normalised scaled factorial moments, popularly known as 'intermittency', is expressed with a decreasing phase space. Our data of target fragments reveal a similar type of increase in SFMs with decreasing bin width of the angular distribution in muon-nucleus interactions at (420±45) GeV. The new observation contradicts the existing concept of the evaporation model that the statistical equilibrium is reached before the emission of fragmented particles from residual target nuclei at high-energy nuclear interactions.Predstavljamo analizu kutne raspodjele dijelova mete u sudarima leptona s jezgrama pomoću sukladnih faktorijalnih momenata (SFM) u jednodimenzijskom prostoru. Sa smanjenjem faznog prostora dolazi do izražaja potencijalna ovisnost normaliziranih sukladnih faktorijalnih momenata, koja se obično naziva “odstupanjem raspodjele” (intermittency). Naši podaci za dijelove mete pokazuju slično povećanje SFM-ova kada se smanjuju intervali kutne raspodjele sudara mion–jezgra na (420±45) GeV. Ova su opažnja suprotna prevladavajućoj zamisli modela isparavanja prema kojoj se statistička ravnoteža postiže prije emisije otkinutih dijelova mete u sudarima na visokim energijama
AUTOMATSKO BODOVANJE STRELJAČKE METE PRIMJENOM DIGITALNE ANALIZE SLIKE
No full textElektronička meta realizirana digitalnom analizom slike je projekt izgradnje okvira za
mete i programiranja softvera elektroničke mete namijenjene strijelcima i organizatorima radi
lakšeg održavanja streljačkih natjecanja/treninga.
Analizom problema i prijašnjih rješenja zaključeno je kako elektronička meta prikuplja
podatke elektroničkim komponentama: mikrofon, laser i kamere. Podaci se šalju računalu koje
ih obrađuje (vrši klasifikaciju pogodaka). Koristeći kameru kao elektroničku komponentu za
očitavanje pogodaka potrebno je definirati koordinatni sustav po kojem će se moći klasificirati
pogodak. Koordinatni sustav mora dinamički generiran kako bi bilo omogućeno korištenje
različitih modela mete.
Dizajniralo se i implementiralo hardversko i softversko rješenje. Elektronička meta
koristi aluminijski okvir za držanje mete i aluminijski nosač za držanje kamere. Koristeći
podatke koje kamera šalje i podatke koje korisnik unosi za stvaranje koordinatnog sustava,
sustav klasificira pogotke te ih ispisuje.
Hardverske i softverske komponente korištene u izradi su: Trust SpotLight Pro kamera,
aluminijski „L“ profili, osobno računalo te Python programski jezik. Kamera je povezana na
okvir pomoću aluminijskog nosača i spojena USB sučeljem na osobno računalo. Za realizaciju
programskog rješenje koristio se programski jezik Python i knjižnica OpenCV. Softver provodi
analizu stanja mete i ako pogodak postoji provesti će klasifikaciju te ga prikazati, a ako pogodak
nije detektiran neće biti prikaza
A Dynamic Subfilter-scale Stress Model for Large Eddy Simulations Based on Physical Flow Scales
No full textWe propose a new definition of the length scale in an eddy-viscosity model for large-eddy simulations (LES). This formulation extends and generalizes a previous proposal [Piomelli, Rouhi and Geurts, Proc. ETMM10, 2014], in which the LES length scale was expressed in terms of the integral length-scale of turbulence determined by the flow characteristics and explicitly decoupled from the simulation grid; this approach was named Integral Length-Scale Approximation (ILSA). As in the original ILSA, the model coefficient was determined by the user, and required to maintain a desired contribution of the unresolved, subfilter scales (SFS) to the global transport. We propose a local formulation (local ILSA) in which the model coefficient is local in space, allowing a precise control over SFS activity as a function of location. This new formulation preserves the properties of the global model; application to channel flow and backward-facing step verifies its features and accuracy
Large-eddy simulation of a separated flow with a sub-filter scale model based on the integral length-scale
No full textA new sub-filter scale model for large-eddy simulations, which uses a length-scale proportional to the integral scale of the turbulence instead of the grid resolution to parametrize the modelled stresses, will be assessed in the prediction of the flow of a boundary-layer over a rough surface, which includes separation and reattachment
Near Wall PIV-Measurements on the Windward Slope of a Hill
No full textThe turbulent flow over periodic hills was measured near to the wall, using planar Particle-Image-Velocimetry (PIV) at high spatial resolution. Our focus is on the near wall turbulence structure on the windward slope of the hill. For large-eddy simulation (LES) we suspect that, if this was not predicted accurately, it affects the prediction of the velocity profiles over the hill crest which in turn will affect the recirculation length downstream of the hill. Regarding the time averaged velocities, we were able to resolve the linear viscous region of the boundary layer. The velocity distribution and also the Reynolds stress does not comply with the law of the wall as it is valid for a turbulent boundary layer at equilibrium
Energy dissipation and flux laws for unsteady turbulence
No full textDirect Numerical Simulations of spatially periodic unsteady turbulence show that the high Reynolds number scalings of the instantaneous energy dissipation rate and interscale energy flux at intermediate wavenumbers are qualitatively different from the well-known cornerstone scalings of equilibrium turbulence where and are time-dependent rms velocity and integral length-scales. Instead, they both scale as where and are length and velocity scales characterizing initial/overall unsteady turbulence conditions
Direct numerical simulation of turbulent Couette-Poiseuille flow with zero skin friction
No full textThe near-wall scaling of mean velocity U(y) is addressed for the case of zero skin friction on one wall of a fully turbulent channel flow. The present DNS results can be added to the evidence in support of the conjecture that U is proportional to √yw in the region just above the wall at which the mean shear dU/dy = 0
Real-space Manifestations of Bottlenecks in Turbulence Spectra
No full textAn energy-spectrum bottleneck, a bump in the turbulence spectrum between the inertial and dissipation ranges, is shown to occur in the non-turbulent, one-dimensional, hyperviscous Burgers equation and found to be the Fourier-space signature of oscillations in the real-space velocity, which are explained by boundary-layer-expansion techniques. Pseudospectral simulations are used to show that such oscillations occur in velocity correlation functions in one- and three-dimensional hyperviscous hydrodynamical equations that display genuine turbulence
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