238 research outputs found
Effect of Hypophysectomy and Estrogen Treatment on Long Bone Fracture Healing of Young Domestic Fowls
No full textAuthor Institution: Department of Anatomy, College of Medicine, The Ohio State UniversityNEGULESCO, JOHN A. AND JOHN A. EGLITIS. Effect of hypophysectomy and estrogen treatment on long bone fracture healing of young domestic fowls. Ohio J. Sci. 75(5): 217, 1975
Quantum chemical modelling of electron polarons and 'green' luminescence in PbTiO<sub>3</sub> perovskite crystals
No full textIn an extension of our previous study on the electron polarons and excitons in KNbO3, KTaO3 and BaTiO3 (Kotomin E A, Eglitis R I and Borstel G 2000 J. Phys.: Condens. Matter 12 L557; Eglitis R I, Kotomin E A and Borstel G 2002 J. Phys.: Condens. Matter 14 3735) by the semiempirical Hartree-Fock method we present here results for free electron polarons in the PbTiO3 perovskite crystal. We discuss the origin of the intrinsic visible band emission of PbTiO3 perovskite oxides (so-called 'green luminescence') which has remained a topic of high interest during the last quarter of a century. We present a theoretical calculation modelling this emission in the framework of a concept of charge transfer vibronic excitons, i.e. as a result of radiative recombination of correlated (bound) self-trapped electron and hole polarons in the highly polarizable PbTiO3-type matrix. The intermediate neglect of differential overlap method combined with the large unit cell periodic defect model was used for quantum chemical calculations and theoretical simulation of the green emission for a PbTiO3 perovskite. The calculated 'green' luminescence energy for PbTiO3 perovskite-type crystals agrees well with experimental measurements presented in this letter
Teaching the Patriotic Poetry of Vilis Pludons and Andrejs Eglitis in the Literature Lessons in Grade 11
No full textDiplomdarba „Viļa Plūdoņa un Andreja Eglīša patriotiskās dzejas apguvei veltītās literatūras stundas 11. klasē” mērķis ir izstrādāt metodiskās sistēmas variantu Viļa Plūdoņa un Andreja Eglīša patriotiskās dzejas apguvei veltītajās literatūras stundās 11. klasē, kas veicinātu skolēnos patriotisma jūtas. Teorētiskās atziņas un pedagoģiskā izmēģinājuma norise veido piecas nodaļas:
1.Literatūras stundu nozīme patriotiskajā audzināšanā.
2.Viļa Plūdoņa un Andreja Eglīša personība un patriotiskā dzeja literatūras mācību kontekstā.
3.Skolotājas sagatavošanās mācību darbam klasē.
4.Viļa Plūdoņa un Andreja Eglīša personībai un patriotiskajai dzejai veltīto stundu norise.
5.Skolotājas un skolēnu sadarbības rezultātu analīze un izvērtējums.
Pirmajā nodaļā raksturota literatūras stundu nozīme patriotiskajā audzināšanā. Otrā nodaļa veltīta Viļa Plūdoņa un Andreja Eglīša personības un patriotiskās dzejas izpētei. Trešajā nodaļā pētītas jauniešu vecumposma īpatnības un raksturoti izmēģinājumā iesaistītie skolēni, aprakstīta skolotājas sagatavošanās mācību darbam klasē, iekļauts arī mācību stundu tematiskais plānojums. Ceturtajā nodaļā aprakstīta Viļa Plūdoņa un Andreja Eglīša personībai un daiļraidei veltīto stundu norise, bet piektajā nodaļā autore veikusi skolotājas un skolēnu sadarbības rezultātu analīzi un izvērtējumu. Pielikumā pievienoti diplomdarba autores veidotie mācību materiāli un skolēnu darbu paraugi.
Metodiskās sistēmas efektivitāte pārbaudīta pedagoģiskā izmēģinājuma laikā. Diplomdarbs paredzēts ne tikai studentiem, bet arī vidusskolas latviešu valodas un literatūras skolotājiem un citiem interesentiem.The goal of this dissertation for a diploma „Teaching the Patriotic Poetry of Vilis Pludons and Andrejs Eglitis in the Literature Lessons in Grade 11” is the elaboration of a variant of a methodologic system for learning about the patriotic poetry of Vilis Pludons und Andrejs Eglitis in the lessons of literature of the 11th class with the goal to further the patriotic sentiment in the pupils. The theoretical base and the desighn of the pedagogic sample-lesson are shown in five chapters:
1. The importance of lessons in literature for the patriotic education of pupils.
2. The personalities and the patriotic poetry of Vilis Pludons and Andrejs Eglitis in the context of teaching lessons in literature.
3. The preparation of the teacher for his lessons with the pupils.
4. The sequence of the lessons which are dedicated to the personalities and the poetry of Vilis Pludons and Andrejs Eglitis.
5. The analysis and evaluation of the results of the lesson and of the interaction between the pupils and the teacher.
The first chapter is dedicated to the importance of literature lessons for the patriotic education of pupils. The second chapter is dedicated to the exploration of the personalities and the patriotic poetry of Vilis Pludons and Andrejs Eglitis. The third chapter is dedicated to the exploration of the special situation of youngers in this age-groupe, pupils of the class who will be part of the proble will be characterized. The preparation of the teacher for this lessons will be described including the programatic planning of his lesson. In the fourth chapter the development of the lessons which are about the personalities and the poetic creations of Vilis Pludons and Andrejs Eglitis will be described. In the fifth chapter the author analyses the interaction between the pupils and their teacher. In the appendix the author shows pedagogical materials he has prepeared for his lessons and what kind of examples he expects the pupils would create in these lessons.
The effectiveness of the pedagogical system has been examined in the pedagogical probe. This diplom-task is not only interesting for students but also for teachers of Latvian language and literature in middle-schools and other people in the pedagogical sphere
Quantum chemical modelling of electron polarons and 'green' luminescence in PbTiO3 perovskite crystals
No full textIn an extension of our previous study on the electron polarons
and excitons in KNbO3, KTaO3 and BaTiO3 (Kotomin E A, Eglitis R
I and Borstel G 2000 J. Phys.: Condens. Matter 12 L557; Eglitis
R I, Kotomin E A and Borstel G 2002 J. Phys.: Condens. Matter
14 3735) by the semiempirical Hartree-Fock method we present
here results for free electron polarons in the PbTiO3
perovskite crystal. We discuss the origin of the intrinsic
visible band emission of PbTiO3 perovskite oxides (so-called
'green luminescence') which has remained a topic of high
interest during the last quarter of a century. We present a
theoretical calculation modelling this emission in the
framework of a concept of charge transfer vibronic excitons,
i.e. as a result of radiative recombination of correlated
(bound) self-trapped electron and hole polarons in the highly
polarizable PbTiO3-type matrix. The intermediate neglect of
differential overlap method combined with the large unit cell
periodic defect model was used for quantum chemical
calculations and theoretical simulation of the green emission
for a PbTiO3 perovskite. The calculated 'green' luminescence
energy for PbTiO3 perovskite-type crystals agrees well with
experimental measurements presented in this letter
Ab initio calculations of CaZrO3 (011) surfaces: systematic trends in polar (011) surface calculations of ABO3 perovskites
No full textFinancial support via Latvian-Ukrainian Joint Research Project No. LV-UA/2018/2 for A. I. Popov, Latvian Council of Science Project No. 2018/2-0083 “Theoretical prediction of hybrid nanostructured photocatalytic materials for efficient water splitting” for R. I. Eglitis and J. Kleperis as well as ERAF project No. 1.1.1.1/18/A/073 for R. I. Eglitis and J. Purans is greatly acknowledged.By means of the CRYSTAL computer program package, first-principles calculations of polar ZrO-, Ca- and O-terminated CaZrO3 (011) surfaces were performed. Our calculation results for polar CaZrO3 (011) surfaces are compared with the previous ab initio calculation results for ABO3 perovskite (011) and (001) surfaces. From the results of our hybrid B3LYP calculations, all upper-layer atoms on the ZrO-, Ca- and O-terminated CaZrO3 (011) surfaces relax inwards. The only exception from this systematic trend is outward relaxation of the oxygen atom on the ZrO-terminated CaZrO3 (011) surface. Different ZrO, Ca and O terminations of the CaZrO3 (011) surface lead to a quite different surface energies of 3.46, 1.49, and 2.08 eV. Our calculations predict a considerable increase in the Zr–O chemical bond covalency near the CaZrO3 (011) surface, both in the directions perpendicular to the surface (0.240e) as well as in the plane (0.138e), as compared to the CaZrO3 (001) surface (0.102e) and to the bulk (0.086e). Such increase in the B–O chemical bond population from the bulk towards the (001) and especially (011) surfaces is a systematic trend in all our eight calculated ABO3 perovskites. This work is licensed under a CC BY license.Latvian-Ukrainian Joint Research Project No. LV-UA/2018/2; Latvian Council of Science Project No. 2018/2-0083; ERAF project No. 1.1.1.1/18/A/073; Institute of Solid State Physics, University of Latvia as the Center of Excellence has received funding from the European Union’s Horizon 2020 Framework Programme H2020-WIDESPREAD-01-2016-2017-TeamingPhase2 under grant agreement No. 739508, project CAMART²
Review of Systematic Tendencies in (001), (011) and (111) Surfaces Using B3PW as Well as B3LYP Computations of BaTiO3, CaTiO3, PbTiO3, SrTiO3, BaZrO3, CaZrO3, PbZrO3 and SrZrO3 Perovskites
No full textThis study was funded by the Latvian Council of Science Grant Number: LZP-2021/1-464. The Institute of Solid State Physics, University of Latvia (Latvia), as the Centre of Excellence, has received funding from the European Union’s Horizon 2020 Framework Programme H2020-WIDESPREAD01-2016-2017-Teaming Phase2 under Grant Agreement No. 739508, project CAMART-2.We performed B3PW and B3LYP computations for BaTiO3 (BTO), CaTiO3 (CTO), PbTiO3 (PTO), SrTiO3 (STO), BaZrO3 (BZO), CaZrO3 (CZO), PbZrO3 (PZO) and SrZrO3 (SZO) perovskite neutral (001) along with polar (011) as well as (111) surfaces. For the neutral AO- as well as BO2-terminated (001) surfaces, in most cases, all upper-layer atoms relax inwards, although the second-layer atoms shift outwards. On the (001) BO2-terminated surface, the second-layer metal atoms, as a rule, exhibit larger atomic relaxations than the second-layer O atoms. For most ABO3 perovskites, the (001) surface rumpling s is bigger for the AO- than BO2-terminated surfaces. In contrast, the surface energies, for both (001) terminations, are practically identical. Conversely, different (011) surface terminations exhibit quite different surface energies for the O-terminated, A-terminated and BO-terminated surfaces. Our computed ABO3 perovskite (111) surface energies are always significantly larger than the neutral (001) as well as polar (011) surface energies. Our computed ABO3 perovskite bulk B-O chemical bond covalency increases near their neutral (001) and especially polar (011) surfaces.--//-- This is an open access article Eglitis, R.I.; Jia, R. Review of Systematic Tendencies in (001), (011) and (111) Surfaces Using B3PW as Well as B3LYP Computations of BaTiO3, CaTiO3, PbTiO3, SrTiO3, BaZrO3, CaZrO3, PbZrO3 and SrZrO3 Perovskites. Materials 2023, 16, 7623. https://doi.org/10.3390/ma16247623 published under the CC BY 4.0 licence.This study was funded by the Latvian Council of Science Grant Number: LZP-2021/1-464. The Institute of Solid State Physics, University of Latvia (Latvia), as the Centre of Excellence, has received funding from the European Union’s Horizon 2020 Framework Programme H2020-WIDESPREAD01-2016-2017-Teaming Phase2 under Grant Agreement No. 739508, project CAMART-2
Acquisition of Anslavs Eglitis's personality and literary work in grade 12
No full textDiplomdarbā “Anšlava Eglīša personības un daiļrades iepazīšana 12. klasē” tiek pētīta problēma, kā organizēt literatūras mācību stundas, lai palīdzētu skolēniem iepazīt Anšlava Eglīša personību un daiļradi, izprotot tajā paustās vērtības. Darba mērķis ir izveidot metodiskās sistēmas variantu, kas palīdzētu 12. klases skolēniem izprast Anšlava Eglīša personību un daiļradi, rosinātu skolēnus aktualizēt daiļradē paustās vērtības. Diplomdarbs sastāv no anotācijas latviešu, kā arī angļu valodā, ievada, četrām nodaļām ar apakšnodaļām, secinājumiem un pielikumiem. Pirmā nodaļa veltīta Anšlava Eglīša personībai un literārajai daiļradei. Otrajā nodaļā tiek aprakstīti pētījumā iesaistītie skolēni, aplūkota nepieciešamo materiālu izstrāde, kā arī tematiskais plānojums. Trešajā nodaļā tiek aprakstīta stundu norise. Ceturtajā nodaļā tiek analizēta un izvērtēta skolotājas un skolēnu sadarbība. Tiek izdarīti secinājumi par diplomdarba nozīmīgumu. Pielikumos apskatāmi skolotājas izstrādātie materiāli.The main aim of the diploma “Acquisition of Anslavs Eglitis’s personality and literary work in grade 12” is to analyze the personality of Anslavs Eglitis and the possibilities of exploring his literary work in grade 12. The problem of the research is how to organize literature lessons to increase students’ interest about Anslavs Eglitis personality and literary work. The diploma paper consists of an abstract in Latvian and English, introduction, four chapters with subchapters, conclusion, and appendix. Chapter One is dedicated to the research of the personality and literary work of Anslavs Eglitis. In chapter Two the author characterizes the students involved in this research and describes the thematic plan for the literature lessons. In chapter Three the author describes the process of literature lessons dedicated to Anslavs Eglitis. Chapter Four consists of the analysis and assessment of cooperation between the students and the teacher. In conclusion the author describes the importance of this research. The appendix contains teaching materials developed by the author
The Glands of the Anal Canal in Man
No full textAuthor Institution: Department of Anatomy, The Ohio State University, Columbus, Ohi
Recommended from our members
Nightside studies of coherent HF radar spectral width behaviour
No full textA previous case study found a relationship between high spectral width measured by the CUTLASS Finland HF radar and elevated electron temperatures observed by the EISCAT and ESR incoherent scatter radars in the post-midnight sector of magnetic local time. This paper expands that work by briefly re-examining that interval and looking in depth at two further case studies. In all three cases a region of high HF spectral width (>200 ms-1) exists poleward of a region of low HF spectral width (<200 ms-1). Each case, however, occurs under quite different geomagnetic conditions. The original case study occurred during an interval with no observed electrojet activity, the second study during a transition from quiet to active conditions with a clear band of ion frictional heating indicating the location of the flow reversal boundary, and the third during an isolated sub-storm. These case studies indicate that the relationship between elevated electron temperature and high HF radar spectral width appears on closed field lines after 03:00 magnetic local time (MLT) on the nightside. It is not clear whether the same relationship would hold on open field lines, since our analysis of this relationship is restricted in latitude. We find two important properties of high spectral width data on the nightside. Firstly the high spectral width values occur on both open and closed field lines, and secondly that the power spectra which exhibit high widths are both single-peak and multiple-peak. In general the regions of high spectral width (>200 ms-1) have more multiple-peak spectra than the regions of low spectral widths whilst still maintaining a majority of single-peak spectra. We also find that the region of ion frictional heating is collocated with many multiple-peak HF spectra. Several mechanisms for the generation of high spectral width have been proposed which would produce multiple-peak spectra, these are discussed in relation to the data presented here. Since the regions of high spectral width are observed both on closed and open field lines the use of the boundary between low and high spectral width as an ionospheric proxy for the open/closed field line boundary is not a simple matter, if indeed it is possible at all
centers in oxide perovskites and alkaline-earth fluorides
No full textValuable discussions with E. A. Kotomin are gratefully acknowledged. Research contribution of R. E. and A. I. P. has been performed within the framework of the EUROfusion Enabling Research project: ENR-MFE19.ISSP-UL-02 “Advanced experimental and theoretical analysis of defect evolution and structural disordering in optical and dielectric materials for fusion applications.” The views and opinions expressed herein do not necessarily reflect those of the European Commission.We report the results of ab initio calculations and analysis of systematic trends for the F centers in the bulk and on the (001) surface in oxide perovskites, such as BaTiO3, SrTiO3, SrZrO3, and PbZrO3, with a corresponding comparison of the F centers in perovskites with those in alkaline earth metal fluorides (CaF2, BaF2, and SrF2). It was found that in perovskites in both bulk F centers and those on their (001) surfaces, two nearest to the vacancy Ti or Zr atoms repel each other, while the next nearest O atoms relax towards the oxygen vacancy. It was also found that the obtained relaxations of atoms in the nearest neighborhood around the F center in ABO3 perovskites are generally larger than in alkaline earth metal fluorides. The bulk and (001)-terminated surface F center ground states in BaTiO3, SrTiO3, and SrZrO3 perovskites are located 0.23, 0.69, 1.12 eV, and 0.07, 0.25, 0.93 eV, respectively, below the conduction band bottom, indicating that the F center is a shallow donor. The vacancies in BaTiO3, SrZrO3, and PbZrO3 are occupied with 1.103e, 1.25e, and 0.68e, respectively, whereas slightly smaller charges, only 1.052e, 1.10e, and 0.3e are localized inside the F center on the perovskite (001) surface. In contrast to the partly covalent ABO3 perovskites, charge is well localized (around 80%) inside the ionic CaF2, BaF2, and SrF2 fluorine vacancy. ---- / / / ---- This is the preprint version of the following article: R. Eglitis, A. I. Popov, J. Purans and Ran Jia,First principles hybrid Hartree-Fock-DFT calculations of bulk and (001) surface F centers in oxide perovskites and alkaline-earth fluorides, Low Temperature Physics,46, 1206 (2020), DOI ttps://doi.org/10.1063/10.0002475, which has been published in final form at https://aip.scitation.org/doi/10.1063/10.0002475. This article may be used for non-commercial purposes in accordance with American Institute of Physics terms and conditions for sharing and self-archiving.EUROfusion Enabling Research project: ENR-MFE19.ISSP-UL-02; Institute of Solid State Physics, University of Latvia as the Center of Excellence has received funding from the European Union’s Horizon 2020 Framework Programme H2020-WIDESPREAD-01-2016-2017-TeamingPhase2 under grant agreement No. 739508, project CAMART²
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