Search results for "dab"

Ilgtspējīgas attīstības aspektu integrēšana dabaszinību stundās vidusskolā

2018

Maģistra darba “Ilgtspējīgas attīstības aspektu integrēšana dabaszinību stundās vidusskolā” aktualitāti nosaka mūsdienu globālās problēmas, kas saistītas ar atmosfēras piesārņojumu un globālo sasilšanu, kā arī pārmērīgu resursu izmantošanu. Pētījuma mērķis ir izpētīt, kā integrēt ilgtspējīgas attīstības aspektus tēmas “Enerģija” apguvei dabaszinībās 12. klasei, skolēnu paradumu maiņas un zināšanu pilnveidei. Pētījumā iesaistījās Rīgas Valsts 3. ģimnāzijas 46 skolēni un četri fizikas skolotāji. Pētījuma ietvaros darba autore ir izstrādājusi tematisko plānu, nodarbību plānus ilgtspējīgas enerģijas aspektu integrēšanai mācību saturā, kas veidoti pamatojoties uz normatīvajiem dokumentiem, kā ar…

Optimized Parallel Implementation of Face Detection based on GPU component

2015

Display Omitted An algorithm for face detection has been implemented on CPU.An acceleration of this algorithm on GPU migration.Performance of GPU implementation shows the effectiveness of this implementation.Another optimization method on GPU are operated. Face detection is an important aspect for various domains such as: biometrics, video surveillance and human computer interaction. Generally a generic face processing system includes a face detection, or recognition step, as well as tracking and rendering phase. In this paper, we develop a real-time and robust face detection implementation based on GPU component. Face detection is performed by adapting the Viola and Jones algorithm. We hav…

Measurement of the Spin of the Ω− Hyperon

2006

A measurement of the spin of the Omega(-) hyperon produced through the exclusive process Xi(c)(0)--Omega(-)K(+) is presented using a total integrated luminosity of 116 fb(-1) recorded with the BABAR detector at the e(+)e(-) asymmetric-energy B factory at SLAC. Under the assumption that the Xi(c)(0) has spin 1/2, the angular distribution of the Lambda from Omega(-)--LambdaK(-) decay is inconsistent with all half-integer Omega(-) spin values other than 3/2. Lower statistics data for the process Omega(c)(0)--Omega(-)pi(+) from a 230 fb(-1) sample are also found to be consistent with Omega(-) spin 3/2. If the Xi(c)(0) spin were 3/2, an Omega(-) spin of 5/2 could not be excluded.

First observation of the doubly charmed baryon decay Ξcc++→Ξc+π+

2018

The doubly charmed baryon decay Ξcc++→Ξc+π+ is observed for the first time, with a statistical significance of 5.9σ, confirming a recent observation of the baryon in the Λc+K−π+π+ final state. The data sample used corresponds to an integrated luminosity of 1.7 fb−1, collected by the LHCb experiment in pp collisions at a center-of-mass energy of 13 TeV. The Ξcc++ mass is measured to be 3620.6±1.5(stat)±0.4(syst)±0.3(Ξc+) MeV/c2 and is consistent with the previous result. The ratio of branching fractions between the decay modes is measured to be [B(Ξcc++→Ξc+π+)×B(Ξc+→pK−π+)]/[B(Ξcc++→Λc+K−π+π+)×B(Λc+→pK−π+)]=0.035±0.009(stat)±0.003(syst).

Measurement of the c0 Baryon Lifetime

2018

We report a measurement of the lifetime of the $��_c^0$ baryon using proton-proton collision data at center-of-mass energies of 7 and 8~TeV, corresponding to an integrated luminosity of 3.0 fb$^{-1}$ collected by the LHCb experiment. The sample consists of about 1000 $��_b^-\to��_c^0��^-\bar��_�� X$ signal decays, where the $��_c^0$ baryon is detected in the $pK^-K^-��^+$ final state and $X$ represents possible additional undetected particles in the decay. The $��_c^0$ lifetime is measured to be $��_{��_c^0} = 268\pm24\pm10\pm2$ fs, where the uncertainties are statistical, systematic, and from the uncertainty in the $D^+$ lifetime, respectively. This value is nearly four times larger than, …

Study of W Boson Production in Association with Beauty and Charm

2015

The associated production of a W boson with a jet originating from either a light parton or heavy-flavor quark is studied in the forward region using proton-proton collisions. The analysis uses data corresponding to integrated luminosities of 1.0 and 2.0  fb[superscript -1] collected with the LHCb detector at center-of-mass energies of 7 and 8 TeV, respectively. The W bosons are reconstructed using the W → μν decay and muons with a transverse momentum, p[subscript T], larger than 20 GeV in the pseudorapidity range 2.0 20  GeV and 2.2 20  GeV. The fraction of W + jet events that originate from beauty and charm quarks is measured, along with the charge asymmetries of the W + b and W + c produ…

Estimation of Passenger Car Equivalents for single-lane roundabouts using a microsimulation-based procedure

2017

Calibration of microscopic traffic simulation models for single-lane roundabouts.Use of a meta-analytical estimation of critical and follow up headways.Use of a genetic algorithm-based procedure.Calculation of passenger car equivalents for single-lane roundabouts. Passenger car equivalents for heavy vehicles are required to carry out capacity calculations and perform operational analysis of any road entity (roadway segments or intersections). At single-lane roundabouts, the constraints to the vehicular trajectories imposed by the curvilinear geometric design and the driver's gap acceptance behaviour are expected to produce an impact of the heavy vehicles on the quality of traffic flow diffe…

Exploratory study on the effects of biodegradable nanoparticles with drugs on malignant B cells and on a human/mouse model of Burkitt lymphoma.

2010

The aim of this study was to determine if Rituximab coated Biodegradable Nanoparticles (BNPs) loaded with Chlorambucil and Hydroxychloroquine could induce apoptosis of B-Chronic Lymphocytic Leukemia (B-CLL), MEC-1 and BJAB cells in vitro and evaluate their toxic and therapeutic effects on a Human/Mouse Model of Burkitt Lymphoma at an exploratory, proof of concept scale. We found that Rituximab-Chlorambucil-Hydroxychloroquine BNPs induce a decrease in cell viability of malignant B cells in a dose-dependent manner. The mediated cytotoxicity resulted from apoptosis, and was confirmed by monitoring the B-CLL cells after Annexin V/propidium iodide staining. Additional data revealed that these BN…

Ģeogrāfija. Ģeoloģija. Vides zinātne: referātu tēzes

2008

Darbs ar dabas materiāliem kā 1,5-3 gadu vecu bērnu sīkās motorikas attīstības veicinātājs

2022

Bērniem dažādu prasmju veidošanās ir atkarīga no vairākkārt atkārtotām darbībām. Viena no nozīmīgākajām sastāvdaļām bērnu pirmsskolas aktivitātēs ir sīkās motorikas attīstība. Sīkās motorikas prasmju attīstīšana ir saistīta ar dažādām darbībām. Sīkās motorikas attīstībai šajā laikā ir būtiska nozīme un darbošanās ar dažādajiem, pieejamajiem dabas materiāliem to var veiksmīgi veicināt. Attīstot roku sīko motoriku, ir pieejami un izmantojami visdažādākie dabas materiāli. Pētījuma mērķis: Noskaidrot dabas materiālu izmantošanas ietekmi uz 1,5-3 gadus vecu bērnu sīkās motorikas attīstību. Rezultāti: Sīkās motorikas attīstība bērniem ir atšķirīga, arī izmantojot dabas materiālus, vieniem tā attī…