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Wyświetlanie 1-5 z 5
Tytuł:
Prefabrykaty w budownictwie Infrastrukturalnym
Precast components in infrastructure construction
Autorzy:
Kownacki, M.
Powiązania:
https://bibliotekanauki.pl/articles/365275.pdf
Data publikacji:
2015
Wydawca:
Nowoczesne Budownictwo Inżynieryjne
Tematy:
prefabrykaty
budownictwo infrastrukturalne
klasyfikacja
rodzaje
zastosowanie
prefabricated
infrastructure
construction
classification
types
application
Opis:
Beton jest najczęściej stosowanym materiałem budowlanym na świecie, mimo to jego znaczenie zbyt często jest pomijane. Tymczasem przemysł prefabrykacji betonowej ma wiele do zaoferowania architektom, inwestorom, klientom, finansistom, ubezpieczycielom i środowisku. Prefabrykacja to szerokie spektrum wyrobów wytwarzanych fabrycznie, poczynając od masowo produkowanych bloczków chodnikowych, a kończąc na masywnych elementach produkowanych na zamówienie. Ich zastosowanie w budownictwie infrastrukturalnym oraz w branży wodociągowo-kanalizacyjnej znacząco wpływa na usprawnienie prac budowlanych, a tym samym skrócenie czasu realizacji obiektów.
Although concrete is the most commonly used construction material in the world, its importance is often overlooked. Meanwhile, the concrete precast industry has a lot to offer to architects, investors, customers, financiers, insurers and the environment. Prefabrication includes a large variety of factory made products, from side walk blocks manufactured on a mass scale to massive custom-made components. Their uses in infrastructure construction and in the water and sewage industry significantly enhances the construction works and thus reduces the time of building construction.
Źródło:
Nowoczesne Budownictwo Inżynieryjne; 2015, 4; 44-48
1734-6681
Pojawia się w:
Nowoczesne Budownictwo Inżynieryjne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of selection for traits of low heritability conducted in noninbred populations on the basis of progeny or performance tests
Autorzy:
Sobczynska, M
Kownacki, M.
Powiązania:
https://bibliotekanauki.pl/articles/2048147.pdf
Data publikacji:
1995
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mouse
heritability
mice
selection method
selection response
performance test
progeny
Opis:
The investigations were carried out to compare selection conducted on the basis of progeny with that on the basis of animals'own performance. Selection was conducted for the body weight at weaning (at the age of 21 days), which is a trait of low heritability (h²=0.1). It was run throughout 15 generations, whereas in generations 13 and 14 three experimental replicas were crossed to obtain population free of inbreeding. A cumulated response to selection was higher in the group selected on the basis of animals' own performance, but after crossing the replicas it decreased clearly in the both groups. The cumulated selection differential was higher in the group selected on the basis of animals' own performance. However, a statistical analysis of the obtained results showed no significant difference between the two selection methods.
Źródło:
Journal of Applied Genetics; 1995, 36, 2; 169-175
1234-1983
Pojawia się w:
Journal of Applied Genetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A correlated response to selection of mice based on progeny or performance tests
Autorzy:
Sobczynska, M
Kownacki, M.
Powiązania:
https://bibliotekanauki.pl/articles/2048110.pdf
Data publikacji:
1995
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
selection
progeny test
mouse
mice
correlated response
performance test
Opis:
A comparison was made of a correlated response to selection between populations of mice selected for body weight at weaning on the basis of their own performance or their progeny. Selection was conducted throughout 15 generations and during the last two generations, three replicas were crossed within each group. A correlated response to selection of the body weight on day 42, weight gains between day 21 and 42 and litter size at birth was significantly higher in the group of mice evaluated on the basis of their progeny. A negative correlated response occurred in the litter size at birth in the group evaluated on the basis of animals' own performance. The realized genetic correlations in the group evaluated on the basis of animals' own performance was 0.9, 0.1 and 0.8, respectively, between the body weight on day 21 and 42, body weight on day 21 and weight gains between day 21 and 42, body weight on day 21 and litter size at birth.
Źródło:
Journal of Applied Genetics; 1995, 36, 1; 48-58
1234-1983
Pojawia się w:
Journal of Applied Genetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Genetic aspects of racing performance in Polish pure bred Arab horses. II. Genetic trends
Autorzy:
Sobczynska, M
Kownacki, M
Powiązania:
https://bibliotekanauki.pl/articles/2046680.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
racing performance
horse
pure breed
Polska
animal breeding
population
genetic trend
animal model
purebred Arabian breed
Opis:
The objective of this study was to estimate genetic trends in the Polish Arab horses population. Annual earnings and rank at finish in fiat races of Polish Arab horses from 1951 to 1993 were analysed with a BLUP animal model. The collected data included 2,234 records of 1,640 4- and 5-year old horses from 143 sires. Only races, in which horses of at least two mentioned age groups took part, were taken into consideration. The model included an individual additive genetic effect as random, the year of race, herd, sex, age, number of starts and the year of race X age effects as fixed effects. Genetic trends were estimated from differences between horses belonging to different age groups and racing in the same year. The annual genetic gains from 1951 to 1993 were 3.5% and 12.3% of the genetic standard deviation for the log of earnings and rank at finish, respectively. Although the main role in breeding Arab horses is played by beauty and exterior, small genetic progress in the log of earnings and rank at finish was obtained.
Źródło:
Journal of Applied Genetics; 1997, 38, 3; 303-308
1234-1983
Pojawia się w:
Journal of Applied Genetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Genetic aspects of racing performance in Polish pure-bred Arab horses. I. Genetic parameters
Autorzy:
Sobczynska, M
Kownacki, M
Powiązania:
https://bibliotekanauki.pl/articles/2047090.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
racing performance
horse
heritability
animal breeding
purebred Arabian breed
genetic parameter
Opis:
The objective of this study was to estimate variance components of Polish Arab horses’ racing performance. The traits studied were the log of annual earnings and rank. Fixed effects of the year of race, herd, sex, the annual number of starts and random animal and permanent environment effects were evaluated on both earnings and rank at finish in Polish Arab horses. The obtained data included 2243 records on 4- and 5-year-old horses by 143 sires. Only races in which 4- and 5-year-olds competed were used. Heritability estimates of earnings and rank at finish were 0.22 and 0.25, respectively. Repeatability estimates of these traits were the same as heritability estimates. All the estimates of genetic and phenotypic correlations between the log of earnings and rank at finish were high and positive. Earnings and rank are good criteria for genetic improvement. Rank seems to be a better measure of racing performance.
Źródło:
Journal of Applied Genetics; 1997, 38, 2; 179-186
1234-1983
Pojawia się w:
Journal of Applied Genetics
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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