Search

Start Over Format online zdroj Rights policy:public

802. Markov stopping games with an absorbing state and total reward criterion

Creator:
Cavazos-Cadena, Rolando, Rodríguez-Gutiérrez, Luis, and Sánchez-Guillermo, Dulce María
Format:
počítač and online zdroj
Type:
model:article and TEXT
Subject:
hitting time, non-expansive operator, monotonicity property, fixed point, equilibrium equation, and bounded rewards
Language:
English
Description:
This work is concerned with discrete-time zero-sum games with Markov transitions on a denumerable space. At each decision time player II can stop the system paying a terminal reward to player I, or can let the system to continue its evolution. If the system is not halted, player I selects an action which affects the transitions and receives a running reward from player II. Assuming the existence of an absorbing state which is accessible from any other state, the performance of a pair of decision strategies is measured by the total expected reward criterion. In this context it is shown that the value function of the game is characterized by an equilibrium equation, and the existence of a Nash equilibrium is established.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

804. Materiálová, technická a ekonomická příprava restaurátorských zásahů na sochařských dílech a architektuře

Creator:
Slížková, Zuzana, Novotný, Jakub, Frankeová, Dita, and Drdácký, Miloš
Publisher:
Ústav teoretické a aplikované mechaniky AV ČR, v. v. i
Format:
electronic, electronic resource, remote, bez média, online zdroj, and 1 online zdroj (146 stran) : ilustrace (převážně barevné), tabulky (některé tištěné napříč).
Type:
model:monograph and TEXT
Subject:
Sochařství, keramika, porcelán, umělecké zpracování kovů, 21. století, sochy, architektonické památky, restaurování památek, stavební materiály, stavební technologie, restaurátorský průzkum, památková péče, statues, architectural monuments, antiquities restoration, building materials, building technology, restoration research, historic preservation, Česko, Czechia, 730.027.1, 72:904, 7.025.3/.4, 691, 69.05, 7.025.3/.4:001.891.5, 719, (437.3), (072), (048.8:082), (0.034.2:08), 21, and 73
Language:
Czech
Description:
Zuzana Slížková, Jakub Novotný, Dita Frankeová, editoři. and České resumé
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

805. Mating activity of Pyrrhocoris apterus (Heteroptera: Pyrrhocoridae) in nature

Creator:
Honěk, Alois , Martinková, Zdenka , and Brabec, Marek
Format:
počítač and online zdroj
Type:
model:article and TEXT
Subject:
Heteroptera, Pyrrhocoridae, Pyrrhocoris apterus, firebug, behaviour, copulation, daily changes, seasonal changes, and sperm depletion
Language:
English
Description:
The mating behaviour of Pyrrhocoris apterus in the laboratory is well studied, but little is known about it under natural conditions. In natural populations in Central Europe, overwintered adults start copulating in March and continue until their death. Caged females, kept under natural conditions in the permanent presence of males, copulated repeatedly. Their mating activity increased sharply until early April, then very slowly until the end of June and then declined as the females die-off. Half of copulations were short (< 5 h) and only 9% were longer than 1 day. By contrast, in natural populations, mating activity (percentage of individuals involved in copula) reached its maximum in April and then decreased until early July, when the overwintered adults die. The decline in mating frequency (percentage of adults involved in copula) was associated with a decrease in the availability of receptive females towards the end of the mating period. For a female, repeated copulation is necessary because sperm is nearly depleted after insemination of 3-5 egg batches.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public

806. Mating advantage of short-winged over long-winged adult males in the cricket Velarifictorus ornatus (Orthoptera: Gryllidae)

Creator:
Zhao, Lv-Quan, Chai, Huai-Lin, Wu, Hong-Jun, and Zhu, Dao-Hong
Format:
print, počítač, and online zdroj
Type:
article, články, journal articles, model:article, and TEXT
Subject:
Zoologie, rovnokřídlí, cvrčkovití, Orthoptera, Gryllidae, Velarifictorus ornatus, mating competition, sing song, trade-off, wing polymorphism, 2, and 59
Language:
English
Description:
The trade-off between flight capability and reproduction is well known in adult males of insects with wing dimorphism but the reproductive advantage of short-winged (SW) males over long-winged (LW) males appears to vary across insect taxa. In the present study, we determined the difference in the mating ability of SW and LW males of Velarifictorus ornatus (Orthoptera: Gryllidae) in order to evaluate whether the SW male morph has a reproductive advantage. We found that the choice of a mate depended on the female. Compared with LW males, SW males had an obvious mating advantage when both SW and LW males courted females simultaneously, and that dealation significantly enhanced the mating ability of LW males. Losing the ability to produce songs reduced the mating advantage of SW males, thereby indicating that the greater mating advantage of SW males was related to the attractiveness of the song. In addition, the difference in the mating ability of LW and SW males was not related to body size or age. These results indicate that SW males of V. ornatus have a mating advantage over their LW counterparts because their underdeveloped flight muscles allow them to devote more resources to reproduction., Lv-Quan Zhao, Huai-Lin Chai, Hong-Jun Wu, Dao-Hong ZhuU., and Obsahuje bibliografii
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

807. Mating alters the rate of development of ovarioles in the ladybird, Propylea dissecta (Coleoptera: Coccinellidae)

Creator:
Shahid, Mhd, Siddiqui, Arshi, Omkar, and Mishra, Geetanjali
Format:
print, počítač, and online zdroj
Type:
article, články, journal articles, model:article, and TEXT
Subject:
Zoologie, brouci, slunéčkovití, věk, beetles, Coccinellidae, age, Coleoptera, Propylea dissecta, mating status, ovariole development, egg maturation, egg load, 2, and 59
Language:
English
Description:
The influence of female mating status on ovarian development of the ladybird, Propylea dissecta (Mulsant) (Coleoptera: Coccinellidae), was investigated under laboratory conditions. We assessed the extent to which ovariole development was affected by mating and for that we initially created a base line by observing age specific ovariole development. Results show that the number of follicles in each ovariole increased with the age of both virgin and mated females up to the age of 3 days, thereafter, no increase in number of follicles was recorded. Ovariole width also increased with age in both virgin and mated females up to 4 days, thereafter, no increase in ovariole width was recorded. The ovariole width of mated females was significantly greater than that of virgin females. Egg maturation and the egg load started to increase at the age of 8 days in virgin females. Thereafter, it increased with increase in female age. While in mated females, immature eggs were recorded in their ovarioles from the age of 1 to 2 days. In mated females, however, the increase in the number of mature eggs per ovariole and egg load started when they were 3 days old. Egg load continuously increased with increasing female age., Mhd Shahid, Arshi Siddiqui, Omkar, Geetanjali Mishra., and Obsahuje bibliografii
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

809. Measuring mitochondrial respiration in adherent cells infected with Trypanosoma cruzi Chagas, 1909 using Seahorse extracellular flux analyser

Creator:
González-Ortiz, Laura Maria, Sánchez-Villamil, Juana Patricia, Celis-Rodríguez, Mike A. , Lineros, Giovanni , Sanabria-Barrera, Sandra , Serrano, Norma C. , Rincon, Melvin Y. , and Bautista-Nino, Paula K.
Format:
počítač and online zdroj
Type:
model:article and TEXT
Subject:
Chagas disease, trophoblastic cells, cardiomyocytes, cellular respiration, and mitochondrial bioenergetics
Language:
English
Description:
Infection with Trypanosoma cruzi Chagas, 1909 is reported to increase the production of reactive oxygen species in patients with Chagas disease. Mitochondria dysfunction, host inflammatory response and inadequate antioxidant response are described as the main factors leading to oxidative stress during acute and chronic stages of the disease. The Seahorse XFe24 extracellular flux platform allows energy metabolism determination through mitochondrial respiration and glycolysis measurements. XFe24 platform can be used in in vitro models of T. cruzi-infected cells, which allow the assessment and even modulation of endogenous conditions of infected cells, generating readouts of real-time cellular bioenergetics changes. In this protocol, we standardised the use of XFe24 technology in T. cruzi infected AC16 cardiomyocytes and SGHPL-5 trophoblasts. In addition, we provide a list of optimised assay specifications, advantages and critical steps to be considered during the process. Cardiomyocytes and trophoblasts are attractive target cells to evaluate the metabolic environment in acute, chronic and congenital Chagas transmission scenarios.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public

810. Measuring Psychological capital in the Slovak language: validation of the revised Compound PsyCap Scale (CPC-12R_SK)

Creator:
Kačmár, Pavol, Kušnírová, Katarína, Dudášová, Ludmila, Vaculík, Martin, and Procházka, Jakub
Format:
počítač and online zdroj
Type:
model:article and TEXT
Subject:
Psychological capital, CPC-12R, well-being, satisfaction, engagement, staying intentions, Big-five, psychologický kapitál, subjektívna pohoda, pracovná spokojnosť, angažovanosť, úmysel zotrvať v organizácii, and päťfaktorový model osobnosti
Language:
Czech
Description:
Objective. Although Psychological capital has encountered increasing research interest in recent years, the scale for measuring PsyCap is absent in the Slovak language. In the present pre-registered study, the authors provide the initial results of the adaptation of the Revised Compound Psychological Capital Scale to the Slovak language. Method. A cross-sectional study with N = 262 people has been conducted. CPC-12R and measures of theoretically related constructs have been used.Results. With regards to evidence for factor validity, the authors found that the default higher-order model (PsyCap as a second-order factor & four first-order dimensions – hope, optimism, self-efficacy, and resilience) provided an acceptable fit to the data. With regards to evidence for convergent and divergent validity, the authors found that, as hypothesized, CPC-12R was related to a set of variables covering: A) a more specific work-related domain, B) more general well-being, and also C) more stable personality traits. More specifically, the scale correlated with work satisfaction, staying intentions, and three aspects of engagement (namely vigor, absorption, and dedication). Furthermore, the scale correlated with subjectively perceived stress, life satisfaction, and emotional components of habitual well-being. The scale was also related Submitted: 21. 1. 2022; P. K., Department of Psychology, Faculty of Arts, Pavol Jozef Šafárik University in Košice, Moyzesova 9, 040 01 Košice, Slovakia; e-mail: pavol.kacmar@upjs.skThis work was supported by the Slovak Research and Development Agency, Contract no. APVV-20-0319, by the grant agency of The Ministry of Education, Science, Research and Sport of the Slovak Republic VEGA Contract no. 1/0853/21, and by the Czech Science Foundation no. GA20-03810S. Open data, analytical code and pre-registration can be found at: osf.io/b4j57/.to Big-five personality domains, such as extra-version, conscientiousness, and negative emotionality, but not to the aesthetic sensitivity facet (considered as evidence for divergent validity). With regard to evidence for concurrent validity, the authors found that CPC-12R was strongly related to PCQ12 and both scales were related to other variables of interest to a similar degree.Limitations. Cross-sectional design and convenience sampling are the main limitations of the present study. and Cieľ. Napriek tomu, že je v posledných rokoch venovanej Psychologickému kapitálu stále viac výskumnej pozornosti, škála, ktorá by tento konštrukt zachycovala v slovenskom jazyku, absentuje. V tejto predregistrovanej štúdii sa autori preto podujali na adaptovanie revidovanej Compound Psychological Capital scale (CPC-12R) do slovenského jazyka a na predstavenie úvodných faktorových, konvergentných, divergentných a súbežných dôkazov validity.Metódy. Výskumný súbor tvorilo 262 účastníkov. Boli využité CPC-12R a ďalšie škály, týkajúce sa rôznych oblastí (sféra práce, duševnej pohody a osobnostných čŕt). Výsledky. Čo sa týka dôkazov validity, týkajúcich sa faktorovej štruktúry, primárny model druhého rádu (PsyCap ako faktor druhého rádu a 4 subfaktory) ukázal predbežne akceptovateľné parametre. Čo sa týka konvergentných a divergentných dôkazov validity, výsledky ukázali, že škála súvisela s premennými z oblasti práce, všeobecnejšie chápanou duševnou pohodou, ako aj stabilnejšimi osobnostnými čŕtami. Presnejšie, škála bola vo vzťahu s pracovnou spokojnosťou (r=.45), úmyslom zotrvať v organizácii (r=.24), ako aj angažovanosťou a jej troma zložkami (r=.52, .36, a .24). Škala sa taktiež ukázala byť vo vzťahu so subjektívne vnímaným stresom (r=-.53), životnou spokojnosťou (r=.56) a viac emočne ladeným aspektom v intenciách pozitívneho (r=.50) a negatívneho (r=-.46) komponentu habituálnej životnej pohody. Okrem toho sa súvis preukázal s črtami modelu veľkej päťky, ako extraverzia (r=.44), svedomitosť (r=.36) a negatívna emocionalita (r=-.59), ale nie s estetickou senzitivitou (r=.02) (dôkaz divergentnej validity). Čo sa týka súbežných dôkazov validity, výsledky poukázali na to, že CPC-12R bolo v tesnom vzťahu s PCQ12 a to aj vtedy, keď autori zobrali do úvahy potenciálnu jazykovú bariéru účastníkov výskumu. Limity. Medzi hlavné limity patria predovšetkým prierezový charakter štúdie a príležitostný výber výskumného súboru. Závery. Štúdia prináša CPC-12R do slovenského jazykového prostredia a ponúka úvodne dôkazy pre viaceré druhy validity.
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 »

View distribution

Current results range from 2003 to 2022

View larger »