Search

Start Over Format print Date Unknown

832. Animal models in the study of exercise-induced cardiac hypertrophy

Creator:
Wang, Y., Wisloff, U., and Kemi, O. J.
Format:
print
Type:
article, články, model:article, and TEXT
Subject:
Fyziologie člověka a srovnávací fyziologie, tělesná cvičení, srdce, exercises, heart, animal models, hypertrophy, 14, and 612
Language:
English
Description:
Exercise training-induced cardiac hypertrophy occurs following a program of aerobic endurance exercise training and it is considered as a physiologically beneficial adaptation. To investigate the underlying biology of physiological hypertrophy, we rely on robust experimental models of exercise training in laboratory animals that mimic the training response in humans. A number of experimental strategies have been established, such as treadmill and voluntary wheel running and swim training models that all associate with cardiac growth. These approaches have been applied to numerous animal models with various backgrounds. However, important differences exist between these experimental approaches, which may affect the interpretation of the results. Here, we review the various approaches that have been used to experimentally study exercise training-induced cardiac hypertrophy; including the advantages and disadvantages of the various models., Y. Wang, U. Wisloff, O. J. Kemi., and Obsahuje bibliografii a bibliografické odkazy
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

833. Anisotropy of elastic properties of rock mass induced by cracks

Creator:
Stan - Kleczek, Iwona and Idziak, Adam F.
Format:
print, bez média, and svazek
Type:
article, články, model:article, and TEXT
Subject:
Geologie. Meteorologie. Klimatologie, seizmicita, seismicity, dynamic elastic moduli, effective moduli, fracturing, seismic wave velocity, 7, and 551
Language:
English
Description:
Fractures commonly existing in rocks flow on their elastic properties and hence on velocity of seismic waves propagating in the rock mass. This relation allows to use seismic methods to determine the fracture density and the orientation of fracture sets. This paper presents results of the research which concern directional changes of dynamic elastic moduli in sedimentary and igneous rocks from south part of Poland. These moduli depend on density of the rock matrix as well as density and orientation of cracks and flow on seismic wave velocity. The seismic equipment Terraloc MK6 (ABEM) was used for the measurements of seismic wave velocity in the surface layers of rock mass. The research was made along precise oriented radial seismic profiles. P-waves and S-waves ve locities were established from recorded seism ograms. The values of P and S waves velocity allowed to calculate values of dynamic elastic moduli for all profiles. The results were presented on diagrams of azimuth distribution of elastic moduli, and diagrams of dynamic elastic moduli versus P - wave velocity. The diagrams showed an anisotropy of elastic properties of the investigated rocks. The maximal values of moduli agree with maximal values of velocity and also with orientation of main crack sets or potential directions of weakening of rock mass. Obtained results point that the seismic methods allow to assign the directions of weakening of rocks what can be for example use during preliminary designing, constructing and exploitation of tunnels., Iwona Stan - Kleczek and Adam F. Idziak., and Obsahuje bibliografické odkazy
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

834. Aniž jest co nového pod sluncem... Co a pro koho vlastně píšeme?: in margine recenze Antonie Doležalové

Creator:
Milan Ducháček
Format:
print, bez média, and svazek
Type:
model:article and TEXT
Subject:
Doležalová, Antonie, 1966-, historiografie, textologie, interpretace dějin, historiography, textology, interpretation of history, 8, and 93/94
Language:
Czech
Description:
V reakci na recenzi své biografie českého historika Václava Chaloupeckého (1882-1951) Václav Chaloupecký: Hledání československých dějin (Praha, Karolinum 2014), kterou v minulém čísle tohoto časopisu publikovala Antonie Doležalová (Hledání Václava Chaloupeckého. In: Soudobé dějiny, roč. 23, č. 1-2, 2016, s. 211-216), se autor zamýšlí nad problémem figurace historiografického textu budovaného na materiálu primárních pramenů a v souvislosti s tím rovněž nad vnitrooborovou i širší recepcí současné české historiografie a nad mezemi i proměnami popularizace výsledků historického výzkumu., In response to a review of his biography of the Czech historian Václav Chaloupecký (1882-1951), Václav Chaloupecký: Hledání československých dějin (Prague: Karolinum, 2014), published in the previous issue of this journal (Antonie Doležalová, ''Hledání Václava Chalupeckého'', Soudobé dějiny, vol. 23 (2016), nos. 1-2, pp. 211-16), the author discusses the problem of composing a historical text built on primary sources and, in connection with that, the reception, both in the field and amongst the general public, of contemporary Czech historiography. He also considers the limits of, and changes in, the popularization of the results of historical research., Milan Ducháček., and Obsahuje bibliografii a bibliografické odkazy
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public

836. Anizotropné magnetické kvapaliny

Creator:
Tomašovičová, Natália
Format:
print, bez média, and svazek
Type:
model:article and TEXT
Subject:
kapalné krystaly, liquid crystals, 6, and 53
Language:
Czech and English
Description:
Hoci najznámejšou technickou aplikáciou kvapalných kryštálov v dnešnej dobe sú kvapalno-kryštalické monitory, kvapalné kryštály sú viac než len ploché obrazovky, aj keď vďaka nim sa dostali do povedomia verejnosti. Výskum v oblasti kvapalných kryštálov však nabral nový smer. Svetový výskum sa odvracia od displejov a zameriava sa na nové možnosti ich využitia, a to na štúdium kompozitných systémov na báze kvapalných kryštálov nielen pre ich technické aplikácie, ale aj na ich využitie v biotechnológiách., Nowadays, the major technical application of liquid crystals is their widespread use in liquid crystal displays. However, even though flat screens have drawn these materials to the public attentions they are much more than just flat screens. Academic liquid crystal science has shown a clear trend of moving away from display research during the last few years. Currently, scientists focus on different topics such as for instance new possible uses in optics, nano-/micro-manipulation, novel composites and biotechnology. This article demonstrates such a development of composite systems containing magnetic nanoparticles in liquid crystalline matrices., Natália Tomašovičová., and Obsahuje bibliografii
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

837. Anizotropní magnetorezistence: relativita ve fyzice pevných látek

Creator:
Výborný, Karel
Format:
print, bez média, and svazek
Type:
model:article and TEXT
Subject:
magnetismus, magnetism, anizotropní magnetorezistence, 6, and 537.6/.8
Language:
Czech and English
Description:
Odpor mnoha magnetických materiálů výrazně závisí nejen na velikosti, nýbrž i na směru magnetizace. Průmyslově se tento jev využívá v senzorech citlivých na magnetické pole, mezi něž v nedávno minulé době patřila i velká část světové produkce čtecích hlav počítačových pevných disků. Teoretické modely této anizotropní magnetorezistence ovšem zatím zdaleka nedosáhly uspokojivé úrovně a shody s experimenty bez fitovacích parametrů se podaří dosáhnout jen výjimečně. Skupina takových poměrně úspěšných modelů se v posledních letech rozrostla o další položku - zředěný magnetický polovodič (Ga,Mn)As., Electric resistance of many magnetic materials depends significantly both on strength and direction of its magnetization. Magnetic field sensors belong to the typical industrial applications of this phenomenon and until recently these included also a major part of the world production of read heads in computer hard-drives. Theoretical models of this anisotropic magnetoresistance, however, have never reached a completely satisfactory level and so far it has been only rarely possible to achieve a decent agreement with experiments without any fit parameters. Few years ago, the family of such relatively successful models could welcome a new member that concerns a dilute magnetic semiconductor (Ga, Mn)As., Karel Výborný., and Obsahuje bibliografii
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

Limit your search

Show values starting with
more »

Show values starting with
more »

Show values starting with
more »

Show values starting with
more »

Show values starting with
more »

Show values starting with
more »

Show values starting with
more »

Show values starting with
more »