A Fluid Model for the Interaction of the Solar Wind and the Geomagnetic Field

Solar wind and geomagnetic field interaction in terms of continuum theory of fluid flo

Latvijas Zinātņu akadēmijas, Latvijas Universitātes Astronomijas institūta populārzinātnisks gadalaiku izdevums

Contents: “ZVAIGŅOTĀ DEBESS” FORTY YEARS AGO: Bursting Stars. J. Francman (abridged). Geodesists Help Renew the Spire of St. Peter’s Church. J. Klētnieks (abridged). DEVELOPMENTS in SCIENCE: The Solar Neutrino Problem. O. Smirnova. NEWS: At Last the Planet at the Star β Pictoris Is Imaged. A. Alksnis, Z. Alksne. SPACE RESEARCH and EXPLORATION: The Trail of an Asteroid Reveals a Recent Collision. A. Alksnis. INTERNATIONAL YEAR of ASTRONOMY 2009: International Year of Astronomy 2009 in Philately. The Rest of the World except Series EUROPA (concluded). J. Limansky. ACADEMIC STAFF of the UNIVERSITY of LATVIA: Assistant Professor in Physics Ojārs Šmits (24.04.1930.-14.03.1993.) of the Latvian University. J. Jansons. CONFERENCE “ASTRONOMY in LATVIA”: Public Sun-Dials in Latvia (concluded). M. Gills. Rainis, Zvaigžņotā Debess and Dainas. I. Pundure. At SCHOOL: Scientific Research Work – the Road to Success. B. Zvejniece, A. Āre. MARS in the FOREGROUND: Public and Private Mars. J. Jaunbergs. For AMATEURS: Amateur Observations Make Professionals to Reconsider Their Views on Jupiter Bombardment. A. Alksnis. For Total Solar Eclipse at the World’s End or Dreams Come True! Juris Kauliņš. FLASHBACK: Observatory of Latvian Astronomical Society in Sigulda. Jānis Kauliņš. NEW BOOKS: Walter Isaacson. Einstein. His Life and Universe. N. Cimahoviča. J. Stradiņš: The Beginnings of Science and Higher Education in Latvia. I. Pundure. BELIEVE IT or NOT: Record at Humanity’s Dawn and Quantities 1, 2, 3, 4, 5, 8, and 9 (concluded). I. Heinrihsone. COSMOS as an ART THEME: Universe as Philately Subject (10th continuation). J. Štrauss. READERS’ SUGGESTIONS: Struve Geodetic Arc in Stamps. A. Buga, J. Kaminskis. READERS’ QUESTIONS: On Nibiru and Doomsday and On Slips in Astronomical Calendar 2011. I. Pundure. The STARRY SKY in the WINTER of 2010. Juris Kauliņš. Supplement: Astronomical Phenomena and Planet Visibility in 2011: A Complex DiagramLR Izglītības un zinātnes ministrija, Latvijas UniversitāteSaturs: Uzliesmojošās zvaigznes ; Ģeodēzisti palīdz atjaunot Pētera baznīcas torni ; O.Smirnova. Saules neitrīno problēma ; A.A. Jaunumi īsumā: Kosmiskā zonde satiekas ar komētu Hartley 2 ; Z.Alksne, A.Alksnis. Beidzot ir atrasta zvaigznes Gleznotāja β planēta ; A.Alksnis. Asteroīda aste liecina par nesen notikušu sadursmi ; A.A. Jaunumi īsumā: Atklāta vistālākā pašreiz zināmā galaktika ; J.Limanskis. Starptautiskais astronomijas gads 2009 filatēlijā. Pārējā pasaule, izņemot Eiropu (nobeigums) ; J.Jansons. LU fizikas docents Ojārs Šmits (24.04.1930.-14.03.1993.) ; I.D. Šoziem atceramies: Fricis Gulbis – 120, Emanuels Donats Fridrihs Jānis Grinbergs – 100 ; M.Gills. Publiski apskatāmie saules pulksteņi Latvijā (nobeig.) ; I.Pundure. Rainis, Zvaigžņotā Debess un Dainas ; B.Zvejniece, A.Āre. Zinātniski pētnieciskais darbs – ceļš uz panākumiem ; Pirmo reizi „ZvD”: Artūrs Āre, Baiba Zvejniece ; J.Jaunbergs. Publiskais un privātais Marss ; 2011.gada 4.janvārī būs novērojams daļējs Saules aptumsums ; A.Alksnis. Amatieru novērojumi liek pārskatīt priekšstatus par Jupitera bombardēšanu ; Juris Kauliņš. Pēc aptumsuma uz otru pasaules malu jeb sapņi piepildās! ; Jānis Kauliņš. Latvijas Astronomijas biedrības observatorija Siguldā ; I.D. Šoziem atceramies: Valdemārs Murevskis, Alfons Apinis, Mstislavs Keldišs – 100 ; N.Cimahoviča. Einšteins. Viņa dzīve un Visums ; I.Pundure. J.Stradiņš: Zinātnes un augstskolu sākotne Latvijā ; Jaunākie ieguvumi „Zvaigžņotās Debess” bibliotēkā ; Redakcijas kolēģija. Pateicība ; I.Heinrihsone. Pieraksts cilvēces rītausmā un skaitļi 1, 2, 3, 4, 5, 8, 9 (nobeig.) ; J.Štrauss. Visuma tēma filatēlijā (10.turpin.) ; A.A. Īsumā: Zvaigžņotās debess iedvesmoti skaņdarbi koncertā Astrophonia ; A.Buga, J.Kaminskis. V.Struves ģeodēziskais loks pastmarkās ; I.Pundure. Par Nibiru un Pasaules galu un Par misēkļiem Astronomiskajā kalendārā 2011 ; J.Kauliņš. Zvaigžņotā debess 2010/11.gada ziemā ; Pirmo reizi „ZvD”: Arunas Buga, Jānis Kaminskis ; I.Vilks un J.Kauliņš. Pielikumā: Astronomiskās parādības un Planētu redzamības kompleksā diagramma 2011.gadamСодержание: Ю.Францман. Вспыхивающие звёзды ; Я.Клетниэкс. Геодезисты помогают восстановить башню церкви св. Петра ; О.Смирнова. Проблема солнечных нейтрино ; З.Алксне, А.Алкснис. Планета звезды β Живописца наконец oбнаружена ; А.Алкснис. Хвост астероида свидетельствует о недавнем столкновении ; Е.Лиманский. Международный астрономический год 2009 в филателии. Остальной мир, кроме серии EUROPA (заключение) ; Я.Янсонс. Доцент физики ЛУ Оярс Шмитс (24.04.1930-14.03.1993) ; М.Гиллс. Солнечные часы в Латвии для всеобщего осмотра (заключение) ; И.Пундуре. Райнис, Zvaigžņotā Debess и дайны ; Б.Звейниэце, А.Аре. Научно-исследовательская работа – путь к успеху ; Я.Яунбергс. Марс общественный, Марс частный ; А.Алкснис. Любительские наблюдения заставляют профессионалов менять взгляд на бомбардировку Юпитера ; Юрис Каулиньш. За Солнечным затмением на другой конец света или мечты сбываются! ; Янис Каулиньш. Обсерватория Латвийского Астрономического общества в Сигулде ; Н.Цимахович. Эйнштейн. Его жизнь и Вселенная ; И.Пундуре. Я.Страдиньш: Истоки науки и высшей школы в Латвии ; И.Хейнрихсоне. Запись на заре человечества и числа 1, 2, 3, 4, 5, 8, 9 (заключение) ; Е.Штраусс. Тема Вселенной в филателии (10-е продолж.) ; А.Буга, Я.Каминскис. Дуга Струве в почтовых марках ; И.Пундуре. Про Нибиру и конец света и Об ошибках в Астрономическом календаре 2011; Юрис Каулиньш. Звёздное небо зимой 2010/11 года ; Приложение: Астрономические явления и Диаграмма видимости планет в 2011 году

Study of the cytotoxic effects of 2,5-diaziridinyl-3,6-dimethyl-1,4-benzoquinone (MeDZQ) in mouse hepatoma cells

A number of quinones have been shown to be efficient anticancer agents. However, some mechanisms of their action, in particular cell signaling are not well understood. The aim of this study was to partly fill this gap by characterizing the mode of cytotoxicity of 2,5-diaziridinyl-3,6-dimethyl-1,4-benzoquinone (MeDZQ) in malignant mouse hepatoma cells (MH-22A) with regard to the expression and activation of main molecules in MAPK cell signaling pathway. The study revealed unequal roles of MAP kinases in MeDZQ-induced cell death: the compound did not induce significant changes in ERK expression or its phosphorylation; JNK appeared to be responsible for cell survival, however, p38 kinase was shown to be involved in cell death. In order to assess the enzymatic activation mechanisms responsible for the action of MeDZQ, we have also found that the antioxidant N,N'-diphenyl-pphenylene diamine, the iron-chelating agent desferrioxamine, and DT-diaphorase inhibitor, dicoumarol, partly protected the cells from MeDZQ cytotoxicity. It points to parallel oxidative stress and bioreductive alkylation modes of the cytotoxicity of MeDZQ

THE PROBLEM OF WILL: PSYCHOLOGICAL, PEDAGOGICAL AND CARITATIVE SOCIAL ASSESSMENT

Modern science proves that new psychological patterns that come to existence in early childhood, have an unchanging significance in developing abilities and shaping personality. Learning of social, moral norms relates to family which is influenced by historical, ethno-cultural, socio-cultural and socio-economic environment. Other persons play an important role in setting goals by their personal example. Action reveals the personality of man guided by certain motivation and striving towards defined, true goals. The purpose of the article is to further understanding of the role of will in shaping human personality. The reference literature researches the mechanism and reasons of formation of individual’s will. The basis of this paper consists of conclusions from the works of A.Augustins, A.Rubenis, A.Dannenfelde (anthropological aspect), V.Renge, J.Piaget, A.Abele and other authors (psychological aspect), D.Albrecht, A.Kuznetsova, R.Jansone and other known authors (pedagogical aspect). It is important for the person to be willing to establish his/her fundamental guidelines. Personality possesses its own vitality, creative character that is able to make a conscious choice and act responsibly in order to strengthen the ties with itself, social environment and God. Neither mind of soul, nor will are positioned in the spiritual world

HOW TO PRODUCE VIDEO LECTURES TO ENGAGE STUDENTS AND DELIVER THE MAXIMUM AMOUNT OF INFORMATION

This paper is dedicated to the analysis of literature about video lectures and finding out the conditions and rules for planning and delivering a good video lecture for modern learning. Different publications and materials on the design and delivery experience of video lectures in learning situations have been analysed. The presented set of the design and delivery experience data of video lectures could be used to create more efficient methods of improving the instruction quality of video lectures

Determination of Vortex Paths by Series Expansion Technique with Application to Cruciform Wings

A series method of determining two-dimensional vortex paths is considered and applied to the computation of vortex positions behind a slender equal-span cruciform wing at any angle of bank as a function of the distance behind the trailing edge. Calculated paths are shown for four bank angles. For a bank angle of 45 degrees comparison is made with the results of a closed expression given in NACA-TN-2605. For other bank angles water-tank experiments provide qualitative comparison. Satisfactory agreement is found for a sufficient distance downstream to include most practical missile-tail positions. The interference forces on an equal-span cruciform wing are calculated for five angles of bank (including the trivial case of zero bank) from the vortex positions found by use of the series