90 research outputs found
VÀÀrkohtlemise esinemine noorukite kÀitumissuhetes
http://tartu.ester.ee/record=b2656342~S6*es
W Serpentis-tĂŒĂŒpi kaksiktĂ€htede orbitaalperioodi muutlikkus
https://www.ester.ee/record=b5241776*es
Improved analytical approximation to arbitrary l-state solutions of the Schrodinger equation for the hyperbolical potentials
A new approximation scheme to the centrifugal term is proposed to obtain the
bound-state solutions of the Schr\"{o}dinger equation for an
exponential-type potential in the framework of the hypergeometric method. The
corresponding normalized wave functions are also found in terms of the Jacobi
polynomials. To show the accuracy of the new proposed approximation scheme, we
calculate the energy eigenvalues numerically for arbitrary quantum numbers
and with two different values of the potential parameter
Our numerical results are of high accuracy like the other
numerical results obtained by using program based on a numerical integration
procedure for short-range and long-range potentials. The energy bound-state
solutions for the s-wave () and cases are given.Comment: 17 page
Bound States in one and two Spatial Dimensions
In this paper we study the number of bound states for potentials in one and
two spatial dimensions. We first show that in addition to the well-known fact
that an arbitrarily weak attractive potential has a bound state, it is easy to
construct examples where weak potentials have an infinite number of bound
states. These examples have potentials which decrease at infinity faster than
expected. Using somewhat stronger conditions, we derive explicit bounds on the
number of bound states in one dimension, using known results for the
three-dimensional zero angular momentum. A change of variables which allows us
to go from the one-dimensional case to that of two dimensions results in a
bound for the zero angular momentum case. Finally, we obtain a bound on the
total number of bound states in two dimensions, first for the radial case and
then, under stronger conditions, for the non-central case.Comment: Latex, 27pp no figure
Retinal regeneration
The goal of research on neural regeneration is to restore brain function following injury. To many, this suggests regrowing damaged axons and re-establishing the interrupted pathways. A second, but little studied aspect of brain regeneration, is the replacement of lost neurons. For example, in some animals the neural retina is reconstituted by regenerative neurogenesis following its partial or total destruction. Two separate processes underlying retinal regeneration have been described: transdifferentiation of retinal pigmented epithelial cells into retinal neural progenitors (in adult urodeles, tadpoles, and embryonic chickens), and alteration in the fate of photoreceptor progenitors intrinsic to the retina (in adult fish).Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/30297/1/0000699.pd
The Youngest Victims: Children and Youth Affected by War
In 1989, the United Nation Convention on the Rights of the Child declared, â[state parties] shall take all feasible measures to ensure protection and care of children who are affected by an armed conflict.â In addition to attempting to secure the welfare of children in armed conflict, the Convention went on to ban the recruitment and deployment of children during armed conflict. Despite the vast majority of sovereign nations signing and ratifying this agreement, this treaty, unfortunately, has not prevented children and youth from witnessing, becoming victims of, or participating in political, ethnic, religious, and cultural violence across the past three decades. This chapter offers an âecological perspectiveâ on the psychosocial consequences of exposure to the trauma of war-related violence and social disruption
ExoClock Project III: 450 new exoplanet ephemerides from ground and space observations
The ExoClock project has been created with the aim of increasing the
efficiency of the Ariel mission. It will achieve this by continuously
monitoring and updating the ephemerides of Ariel candidates over an extended
period, in order to produce a consistent catalogue of reliable and precise
ephemerides. This work presents a homogenous catalogue of updated ephemerides
for 450 planets, generated by the integration of 18000 data points from
multiple sources. These sources include observations from ground-based
telescopes (ExoClock network and ETD), mid-time values from the literature and
light-curves from space telescopes (Kepler/K2 and TESS). With all the above, we
manage to collect observations for half of the post-discovery years (median),
with data that have a median uncertainty less than one minute. In comparison
with literature, the ephemerides generated by the project are more precise and
less biased. More than 40\% of the initial literature ephemerides had to be
updated to reach the goals of the project, as they were either of low precision
or drifting. Moreover, the integrated approach of the project enables both the
monitoring of the majority of the Ariel candidates (95\%), and also the
identification of missing data. The dedicated ExoClock network effectively
supports this task by contributing additional observations when a gap in the
data is identified. These results highlight the need for continuous monitoring
to increase the observing coverage of the candidate planets. Finally, the
extended observing coverage of planets allows us to detect trends (TTVs -
Transit Timing Variations) for a sample of 19 planets. All products, data, and
codes used in this work are open and accessible to the wider scientific
community.Comment: Recommended for publication to ApJS (reviewer's comments
implemented). Main body: 13 pages, total: 77 pages, 7 figures, 7 tables. Data
available at http://doi.org/10.17605/OSF.IO/P298
Feasibility work to inform the design of a randomized clinical trial of wound dressings in elective and unplanned abdominal surgery
Background:
Designing RCTs in surgery requires consideration of existing evidence, stakeholders' views and emerging interventions, to ensure that research questions are relevant to patients, surgeons and the health service. When there is uncertainty about RCT design, feasibility work is recommended. This study aimed to assess how feasibility work could inform the design of a future pilot study and RCT (Bluebelle, HTA â 12/200/04).
Methods:
This was a prospective survey of dressings used to cover abdominal wounds. Surgical trainees from 25 hospitals were invited to participate. Information on patient risk factors, operation type and type of wound dressings used was recorded for elective and unplanned abdominal procedures over a 2âweek interval. The types of dressing used were summarized, and associations with operation type and patient risk factors explored.
Results:
Twenty hospitals participated, providing data from 727 patients (1794 wounds). Wounds were predominantly covered with basic dressings (1203 of 1769, 68·0 per cent) and tissue adhesive was used in 27·4 per cent (485 of 1769); dressing type was missing for 25 wounds. Just 3·6 per cent of wounds (63 of 1769) did not have a dressing applied at the end of the procedure. There was no evidence of an association between type of dressing used and patient risk factors, type of operation, or elective and unscheduled surgery.
Conclusion:
Based on the findings from this large study of current practice, the pilot study design has evolved. The inclusion criteria have expanded to encompass patients undergoing unscheduled surgery, and tissue adhesive as a dressing will be evaluated as an additional intervention group. Collaborative methods are recommended to inform the design of RCTs in surgery, helping to ensure they are relevant to current practice
Recommended from our members
ExoClock Project. III. 450 New Exoplanet Ephemerides from Ground and Space Observations
The ExoClock project has been created to increase the efficiency of the Ariel mission. It will achieve this by continuously monitoring and updating the ephemerides of Ariel candidates, in order to produce a consistent catalog of reliable and precise ephemerides. This work presents a homogenous catalog of updated ephemerides for 450 planets, generated by the integration of âŒ18,000 data points from multiple sources. These sources include observations from ground-based telescopes (the ExoClock network and the Exoplanet Transit Database), midtime values from the literature, and light curves from space telescopes (Kepler, K2, and TESS). With all the above, we manage to collect observations for half of the postdiscovery years (median), with data that have a median uncertainty less than 1 minute. In comparison with the literature, the ephemerides generated by the project are more precise and less biased. More than 40% of the initial literature ephemerides had to be updated to reach the goals of the project, as they were either of low precision or drifting. Moreover, the integrated approach of the project enables both the monitoring of the majority of the Ariel candidates (95%), and also the identification of missing data. These results highlight the need for continuous monitoring to increase the observing coverage of the candidate planets. Finally, the extended observing coverage of planets allows us to detect trends (transit-timing variations) for a sample of 19 planets. All the products, data, and codes used in this work are open and accessible to the wider scientific community
Impact of subsidies for wood processing enterprises
Puidutööstus on töötleva tööstuse majandusharu, mis tegeleb puidu töötlemisega.
Puidutööstus jaguneb kolmeks valdkonnaks â puidu töötlemine (sh puit-, korktoodete ja
punutiste tootmine); paberi- ja paberitoodete tootmine ja mööbli tootmine. KÀesolevas töös
vaadeldi puidutööstussektori kolmest valdkonnast ĂŒht â puidutöötlemise valdkonda. Vaatluse
all olid just puidutöötlemisega tegelevad ettevÔtted ning neile antud toetused, sest tegemist on
puidutöötlemise sektori suurima ja Eesti jaoks ĂŒhe ĂŒliolulise valdkonnaga. Seni on Eestis aga
suhteliselt vÀhe uuritud puidutöötlemise valdkonda ning toetuste mÔju ettevÔtetele.
Puidutöötlemise valdkond piiritleti antud töö raames Eesti majanduse tegevusalade
klassifikaatori EMTAK 2008 koodiga 16. Nimetatud valdkonda jÀÀvad ettevÔtted, mis
tegelevad puittoodete tootmisega.
Antud töö eesmĂ€rk oli analĂŒĂŒsida perioodil 2006-2008 makstud ekspordi-, nĂ”ustamis-,
koolitus- ja investeeringutoetuste mÔju puidutöötlemise valdkonna ettevÔtete
majandusnÀitajatele, vÔrrelda neid nÀitajaid toetust mitte saanud ettevÔtete nÀitajatega ning
teha saadud tulemustest jÀreldused toetuste mÔju kohta ettevÔtete kÀibe- ja pÔhivarale,
omakapitalile, mĂŒĂŒgitulule, töötajate arvule, vĂ”lakordajale ning pĂ”hivara tootlikkusele ja
rentaablusele.
Puidutöötlemise valdkonna vaatlemisel selgus, et perioodil 2005-2010 on puidutöötlemise
valdkonnas olnud kolm perioodi:
âą aastatel 2005-2007 kasvuperiood (majandustĂ”usu aeg), mil ettevĂ”tted ĂŒldiselt laienesid
ja mĂŒĂŒgitulud suurenesid;
⹠aastatel 2008-2009 langusperiood (majandussurutise aeg), mil vÀhenes ettevÔtete arv,
ettevÔtted minimeerisid tootmiskulusid (vÀhenes töötajate arv) ning vÀhenes
mĂŒĂŒgitulu ja investeerimismaht;
âą 2010.a turgude taasaktiviseerumine, mil on hakanud suurenema ĂŒle kahe aasta nii
ettevĂ”tete, kui neis töötavate inimeste arv ning tootmismahud ja seelĂ€bi ka mĂŒĂŒgitulu
ning ekspordimahud. MajandusnÀitajate vaatlemisel selgus, et nii toetust saanud kui toetust mitte saanud ettevÔtetel
suurenes perioodil 2006-2010 teistest nÀitajatest enam omakapitali ja kÀibevarade maht. See
nĂ€itab, et ettevĂ”tted pĂŒĂŒavad muuta oma majandusseisu stabiilsemaks ja sellest tulenevalt ka
jÀtkusuutlikumaks.
Toetust saanud ja toetust mitte saanud ettevĂ”tete analĂŒĂŒsimisel nĂ€htus, et koguni iga neljas
perioodil 2006-2008 toetust saanud ettevÔte on oma tegevuse lÔpetanud vÔi raskustes.
Toetusmeetmete lÔikes on enim raskustesse sattunud nÔustamis- vÔi koolitustoetust ja
investeeringutoetust saanud ettevÔtted (mÔlemal juhul umbes 22% nimetatud toetusliigi
raames toetust saanutest). Tegevuse on 2012. a aprilli lÔpu seisuga lÔpetanud 12,6% perioodil
2006-2008 toetust saanud ettevÔtetest (kustutatud vÔi pankrotis). Suur pankrotistunud vÔi
kustutatud ettevÔtete osakaal tuleneb kindlasti vaadeldud perioodi jÀÀnud raskest
ĂŒlemaailmsest majandusolukorrast. Suureks vĂ”i pikemaajaliseks maksuvĂ”lglaseks osutus
21.04.2012 seisuga 7% toetuse saajatest ja 5% toetust mitte saanud ettevÔtetest. Suhteliselt
samas suurusjÀrgus olev maksuvÔlga omavate ettevÔtete osakaal nÀitas, et toetuse saamine vÔi
mittesaamine ei mÔjuta oluliselt ettevÔtte vÔimekust kanda oma kohustusi riigi ees.
Toetuste positiivne mÔju ettevÔtete majandusnÀitajatele avaldus kolmel korral. Selgus, et
toetustel on positiivne mÔju ettevÔtete töötajate arvule just keerulisemates majandusoludes,
soodustades kiiremat kohanemist uutes turutingimustes. Lisaks avaldus positiivne mÔju ka
nÔustamistoetusel ettevÔtete omakapitali suurenemisele. Kui vaadata toetust mitte saanud
ettevÔtete omakapitali muutumist, siis tÔenÀoliselt oleks neis ettevÔtetes omakapital
suurenenud ka ilma toetust maksmata, kuid siis tÔenÀoliselt perioodi jooksul vÀiksemas
mahus. Kolmas koht, kus avaldus toetuste positiivne mÔju, oli vÔlakordaja vaatlemine.
Toetust saanud ettevÔtete vÔlakordaja oli teisel ja kolmandal aastal peale investeeringu
tegemist vÀiksem kui toetust mitte saanud ettevÔtetel. Toetust saanud ettevÔtted tegid toetuse
raames suuremaid investeeringuid lĂŒhema aja jooksul, mistĂ”ttu vĂ”eti enam lĂŒhiajalisi
kohustusi, erinevalt toetust mitte saanud ettevÔtetest. Toetust saanud ettevÔtted on suutnud
enamiku vÔetud kohustustest ka tasuda. Toetust mitte saanud ettevÔtted on investeerinud
samal ajal vÀiksemas mahus, kuid pidevalt (igal aastal natuke), mistÔttu vÔlakordaja on
suurenenud perioodi keskmisena isegi enam kui toetust saanud ettevÔtetes.
Toetuste andmisega ei kaasnenud olulist mÔju vaadeldud perioodil puidutöötlemise valdkonna
ettevÔtete pÔhi- ja kÀibevara vÀÀrtuse muutumisele.Toetuste negatiivne mÔju avaldus investeeringu- ja eksporditoetuste saamise korral ettevÔtte
omakapitali muutusele, mis oli toetuse andmise aastal ja sellele jÀrgneval aastal pigem
negatiivne. Samuti avaldas toetuse saamine ettevÔtetes negatiivset mÔju tööjÔu tootlikkuse
kasvule. Seda eeskÀtt just ekspordi- ja investeeringutoetust saanud ettevÔtete korral.
Nimetatud ettevÔtete töötajate tulemuslikkus on pÀrast toetuse saamist teiste ettevÔtetega
vÔrreldes pigem vÀhenenud. Nende ettevÔtete töötajad, kes said nÔustamistoetust, on teistest
toetust saanud ettevÔtetest ning toetust mitte saanud ettevÔtetest tootlikumad, kuid jÀÀvad
siiski alla valdkonna keskmisele nÀitajale. Lisaks selgus, et olenemata asjaoludest teenib
toetust saanud ettevÔte keskmiselt enam kasumit, kuigi nende pÔhivara rentaablus on
madalam kui toetust mitte saanud ettevÔtetel. PÔhjuseks on asjaolu, et toetust saanud
ettevÔtetel on pÔhivara mÀrksa enam kui toetust mitte saanud ettevÔtetel, mistÔttu rentaabluse
tÔstmiseks oleks vaja tulemuslikkust (efektiivsust) tÔsta. Ka pÔhivara tootlikkus on toetust
mitte saanud ettevÔtetes parem.Manufacture of wood is one of the three fields in the timber industry. This thesis
examined manufacturers of wood as well as the subsidies they have received as this is
the largest field in the wood manufacturing sector and extremely important for Estonia.
For the purposes of this thesis, the manufacture of wood was delimited to code 16 of the
Estonian classification of economic activities (hereinafter: EMTAK 2008). Said field
covers companies engaged in the manufacture of products of wood.
This thesis aimed to analyse the impact of the export, consultation, training and
investment subsidies granted in 2006â2008 on the economic indicators of the companies
in the field of wood manufacturing, compare these indicators with those of the
companies that did not receive subsidies, and draw conclusions based on the results
about the impact of the subsidies on the current and fixed assets, equity capital, sales
revenue, staff numbers, debt coefficient, and the yield and ROE of the fixed assets of the
companies.
Examination of the field of wood manufacturing indicated that there were three distinct
periods in the field of wood manufacturing over the period of 2005â2010:
âą 2005â2007 was a growth period (economic upturn) when companies were
generally expanding and sales revenues increasing;
âą 2008â2009 was a downturn period (economic recession) when the number of
companies decreased, companies minimised production costs (number of
employees decreased) and sales revenue and investment volume decreased;
âą recovery of markets in 2010 when over two years, both the number of companies
and the number of people employed at these have started to increase, thus
increasing production volumes and also sales revenue and export volumes. Having analysed the companies that were subsidised and those that were not, it appeared
that as many as every fourth company that was subsidised in the period 2006â2008 has
discontinued business or is in difficulties. As of the end of April 2012, 12.6% of the companies that were subsidised in the period 2006â2008 have been dissolved (deleted
from register or bankrupt). As of 21 April 2012, there were respectively 7% and 5% of
subsidised and non-subsidised companies among those that have large or long-term tax
arrears. The proportion of companies that had a rather similar level of tax arrears
indicated that subsidisation or non-subsidisation has no significant effect on the ability
of a company to fulfil its obligations towards the state.
The positive impact of subsidies on the economic indicators of companies manifested
itself mainly through staff numbers. It appeared that subsidies have a positive impact on
the preservation or increase of the number of staff mainly in more complex economic
situations and that they facilitate a faster adaptation to the new market conditions.
Subsidies did not have any significant impact on the changes in the value of the fixed
and current assets of the manufacturers of wood.
The negative effect of the subsidies manifested itself in the change in a companyâs
equity capital in cases where investment and export subsidies had been received, and the
change was mainly negative during the year of subsidisation and the year following it.
Moreover, subsidies had a negative impact on the increase in labour productivity of the
companies. This was mainly the case with the companies that had been granted export
and investment subsidies. After the receipt of subsidies, the staff productivity at these
companies has mainly decreased when we compare them to other companies. In
addition, it appeared that regardless of the fact that a company that has been subsidised
generally makes more profit, the ROE of its fixed assets is lower than that of the
companies that have not been subsidised. Likewise, ROE is generally also better in
unsubsidised companies
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