Search results for "Horizon"
showing 10 items of 600 documents
First M87 Event Horizon Telescope Results. V. Physical Origin of the Asymmetric Ring
2019
The Event Horizon Telescope (EHT) has mapped the central compact radio source of the elliptical galaxy M87 at 1.3 mm with unprecedented angular resolution. Here we consider the physical implications of the asymmetric ring seen in the 2017 EHT data. To this end, we construct a large library of models based on general relativistic magnetohydrodynamic (GRMHD) simulations and synthetic images produced by general relativistic ray tracing. We compare the observed visibilities with this library and confirm that the asymmetric ring is consistent with earlier predictions of strong gravitational lensing of synchrotron emission from a hot plasma orbiting near the black hole event horizon. The ring rad…
Geostatistical 3-dimensional integration of measurements of soil magnetic susceptibility.
2010
In soil magnetometry, two types of measurements are usually performed. The first type is measurements performed on the soil surface, frequently using an MS2D sensor. The second type includes measurements of magnetic susceptibility carried out in the soil profile, usually to a depth of about 30 cm. Up to now, such measurement results were analyzed separately. However, it is possible and advantageous to integrate these two types of measurements. The goal of the study was to integrate measurements of magnetic susceptibility performed on the soil surface and in the soil profile. More specifically, the goal was to obtain 3-dimensional spatial distributions of magnetic susceptibility of the topso…
Uzņēmuma SIA "Ķiršu koks" finanšu rādītāju analīze
2019
Diplomdarba tēma ir uzņēmuma SIA “ĶIRŠU KOKS” finanšu radītāju analīze. Diplomdarba pētāmais objekts ir uzņēmums SIA “ĶIRŠU KOKS”, tā darbība un finanšu rādītāji. Diplomdarba mērķis ir, izmantojot finanšu analīzes teorētiskos aspektus un uzņēmuma SIA „ĶIRŠU KOKS” darbības specifiku, veikt uzņēmuma finanšu analīzi, uz veiktās analīzes bāzes izstrādāt priekšlikumus finanšu stabilitātes uzlabošanai uzņēmumā SIA „ĶIRŠU KOKS” un tālākai darba attīstībai. Veiktās uzņēmuma SIA „ĶIRŠU KOKS” finanšu analīzes rezultāti norāda uz to, ka uzņēmumam ir finansiālas grūtības, uzņēmumam grūti segt savas saistības, uzņēmumam nav resursu tālākai attīstībai, darba ietvaros tiek sniegti risinājumi uzņēmuma fina…
Uzņēmuma SIA “Tālbergs” finansiālā stāvokļa analīze un attīstības perspektīvas
2020
Darba autore pētījuma ietvaros sniedz SIA “Tālbergs” darbības procesu raksturojumu, veicot uzņēmuma finanšu analīzi, lai novērtētu pašreizējo uzņēmuma situāciju, kā arī iespējamos pilnveidojumus uzņēmuma darbībā. Darba mērķis – pamatojoties uz finanšu analīzes teorētisko aspektu raksturojumu, novērtēt SIA “Tālbergs” finansiālo stāvokli un izstrādāt priekšlikumus uzņēmuma tālākai attīstībai. Pētījuma rezultāti parādīja, ka uzņēmuma darbības galvenās problēmas ir saistītas ar izmaksu, ilgstošo debitoru un īstermiņa saistību pieaugumu, kam ir negatīva ietekme uz uzņēmuma darbības rādītājiem, un ir izstrādāti priekšlikumi, kā samazināt šo posteņu vērtības pieaugumu.
Tomographic reconstruction reveals the morphology of a unique cellular organelle, the aggregated macrotubules (Macrotubuli aggregati) of human retina…
2014
Abstract Horizontal cells of the human retina contain unique tubular organelles that have a diameter which is about 10 times larger than that of microtubules (∼230 nm). These macrotubuli in most cases form regular aggregates. Therefore we propose to introduce them as Macrotubuli aggregati in the Terminologia histologica. Tomographic investigation of the structures revealed that the walls of the tubules most probably consist of intermediate filaments running nearly parallel to each other and show somewhat regularly attached ribosomes on their inner and also outer surface. About 2% of the organelles exhibit double- to multiple layered walls and less than 1% resemble large scrolls. The tubules…
Horizontal transmission of streptococcus mutans in schoolchildren
2011
Objetive: The aim of this study was to analyze possible horizontal transmission patterns of S. mutans among 6-7-yr-old schoolchildren from the same class, identifying genotypes and their diversity and relationship with caries disease status. Study Design: Caries indexes and saliva mutans streptococci and lactobacilli counts were recorded in 42 schoolchildren. Mutans streptococci colonies were identified by means of biochemical tests and all S. mutans strains were genotyped by arbitrarily primed polymerase chain reaction. A child was considered free of S. mutans when it could not be isolated in 3 samples at 1-week intervals. Results: S. mutans was isolated in 30 schoolchildren: 20 having one…
Tracing the genetic origin of Europe’s first farmers reveals insights into their social organization
2014
Farming was established in Central Europe by the Linearbandkeramik culture (LBK), a well-investigated archaeological horizon, which emerged in the Carpathian Basin, in today's Hungary. However, the genetic background of the LBK genesis has not been revealed yet. Here we present 9 Y chromosomal and 84 mitochondrial DNA profiles from Mesolithic, Neolithic Starčevo and LBK sites (7th/6th millennium BC) from the Carpathian Basin and south-eastern Europe. We detect genetic continuity of both maternal and paternal elements during the initial spread of agriculture, and confirm the substantial genetic impact of early farming south-eastern European and Carpathian Basin cultures on Central European p…
Coexistence of three microsporidia parasites in populations of the freshwater amphipod Gammarus roeseli: evidence for vertical transmission and posit…
2004
We investigated the prevalence, transmission mode and fitness effects of infections by obligatory intracellular, microsporidian parasites in the freshwater amphipod Gammarus roeseli. We found three different microsporidia species in this host, all using transovarial (vertical) transmission. All three coexist at different prevalences in two host populations, but bi-infected individuals were rarely found, suggesting no (or very little) horizontal transmission. It is predicted that vertically-transmitted parasites may exhibit sex-specific virulence in their hosts, or they may have either positive or neutral effects on host fitness. All three species differed in their transmission efficiency an…
Does the centre of mass remain stable during complex human postural equilibrium tasks in weightlessness?
2001
In normal gravity conditions the execution of voluntary movement involves the displacement of body segments as well as the maintenance of a stable reference value for equilibrium control. It has been suggested that centre of mass (CM) projection within the supporting base (BS) is the stabilised reference for voluntary action, and is conserved in weightlessness. The purpose of this study was to determine if the CM is stabilised during whole body reaching movements executed in weightlessness. The reaching task was conducted by two cosmonauts aboard the Russian orbital station MIR, during the Franco-Russian mission ALTAIR, 1993. Movements of reflective markers were recorded using a videocamera…
The middle house or the middle floor: Bisecting horizontal and vertical mental number lines in neglect
2007
Abstract This study explores the processing of mental number lines and physical lines in five patients with left unilateral neglect. Three tasks were used: mental number bisection (‘report the middle number between two numbers’), physical line bisection (‘mark the middle of a line’), and a landmark task (‘is the mark on the line to the left/right or higher/lower than the middle of the line?’). We manipulated the number line orientation purely by task instruction: neglect patients were told that the number-pairs represented either houses on a street (horizontal condition) or floors in a building (vertical condition). We also manipulated physical line orientation for comparison. All five negl…