Search results for "PERT"
showing 10 items of 7689 documents
Ergonomiskās slodzes parametri un LEAN pieeja risku mazināšanā un preventīvo pasākumu realizēšanā”.
2021
Maģistra darba tēma: "Ergonomiskās slodzes parametri un LEAN pieeja risku mazināšanā un preventīvo pasākumu realizēšanā". Darba autors Uldis Piekuss. Darba zinātniskais vadītājs: profesors, Dr.sc.admin. Henrijs Kaļķis. Darbs izklāstīts uz 90 lapām, ietver 56 attēlus, 21 tabulas, satur 8 pielikumus, izmantoti 82 informatīvos avotus. Pētījums sastāv no 4 daļām. Organizācijām, lai uzlabotu produktivitāti, konkurētspēju, darba vidi un apstākļus, ergonomika un LEAN jāskata kā savstarpēji papildinošas pieejas. Latvijā nav daudz pētījumu par risku mazināšanas iespējām darba vietā un preventīvo pasākumu organizēšanu, kombinējot ergonomiskās slodzes parametrus ar LEAN pieeju. Ergonomika un LEAN tiec…
Ambulatoro ārstniecības iestāžu darbinieku psihosociālie darba vides riska faktori un to primārās un sekundārās profilakses iespējas
2018
Maģistra darba nosaukums: “Ambulatoro ārstniecības iestāžu darbinieku psihosociālie darba vides riska faktori un to primārās un sekundārās profilakses iespējas”. Darba autors: Uģis Znotiņš. Darba zinātniskā vadītāja: asoc. prof., Dr. med. Ženija Roja. Darbs izstrādāts uz 110 lpp., satur 69 attēlus, 5 tabulas, 8 pielikumus un 65 informatīvos avotus. Maģistra darbs sastāv no 4 daļām. Pirmajā daļā apkopoti Latvijas un ārvalstu literatūras dati par medicīnas darbinieku darba pienākumus reglamentējošo normatīvo aktu prasībām, statistikas dati Latvijas ārstniecības iestāžu finanšu un personālpolitiku, kā arī citiem cēloņiem un to saistību ar distresa un sekojošu izdegšanas sindroma rašanos un izp…
Investigating the Structural Properties of an IT-Enabled Resource
2019
The synergistic combination and integration of information technology (IT) and other complementary organizational resources to form IT-enabled resources, has long been identified as one means through which organizations can derive benefits from IT. However, research shows that the integration required to form IT-enabled resources from which organizations derive benefits, also constrains the renewal and redeployment of the IT-enabled resources to address new strategic imperatives. Thus, there are several calls for further research on how organizations can sustain the derivation of benefits from IT especially in dynamic environments. This study responds to such calls. Specifically, it draws o…
On the mechanism of radiation synthesis of nanogels
2016
Radiation-engineered poly(N-vinyl pyrrolidone) nanogels are very interesting biocompatible nanocarriers for i.v. administration of therapeutics and contrast agents for bioimaging among other applications. Nanogels are usually produced upon irradiation of dilute aqueous polymer solutions. Under these conditions, the polymer radicals formed primarily react via intramolecular radical-radical combination forming intramolecular crosslinks. The manufacturing process is fast and effective and grants excellent control of particle size and simultaneous sterilization of the formed nanogels. Interestingly, primary amino groups and carboxyl groups, useful for (bio)conjugation, are also formed in a dose…
La nuisibilité directe des adventices en grandes cultures : quelles réponses nous apportent les essais désherbages ?
2016
The direct harmful effect of weeds in field crops : what do herbicide trials tell us ? Weeds are plants whose undesirable qualities (“harmfulness") outweigh their desirable qualities (trophic resources). Few studies conclude that weeds do not affect crop yield. However, it is difficult to generalize since weeds compete with crops for resources and these resources are spatially and temporally variable. This study analyzed 110 herbicide trials (untreated vs. treated plots) performed in France from 1993 to 2015 on three major grain crops: winter wheat, winter oilseed rape and sunflower. Significant yield losses were found in 92% of wheat trials (average over all trials: -2.6 t/ha), 51% of wint…
Flat-band superconductivity in strained Dirac materials
2016
We consider superconducting properties of a two-dimensional Dirac material such as graphene under strain that produces a flat band spectrum in the normal state. We show that in the superconducting state, such a model results in a highly increased critical temperature compared to the case without the strain, inhomogenous order parameter with two-peak shaped local density of states and yet a large and almost uniform and isotropic supercurrent. This model could be realized in strained graphene or ultracold atom systems and could be responsible for unusually strong superconductivity observed in some graphite interfaces and certain IV-VI semiconductor heterostructures.
Association between resting blood pressure and maximal blood pressure response to exercise and arterial health
2022
We investigated the longitudinal associations of blood pressure, cardiorespiratory fitness, and arterial stiffness among children. Arterial stiffening has been repeatedly shown to be a cardiovascular mortality predictor and can be observed early in childhood. As such, it is crucial to understand whether a child’s blood pressure, fitness level, and body composition can predict early signs of atherosclerosis and arterial stiffening. The current study examined the relationship between blood pressure, cardiorespiratory fitness, and arterial stiffness over time in children, using data from the Physical and Nutrition in Children (PANIC) Study. It is a physical and dietary intervention study condu…
Representing compact sets of compact operators and of compact range vector measures
1987
Theoretical investigation of the electronic structure of fullerenes
1994
Summary form only given. Research in the growing family of fullerene compounds are in continuous expansion. Much theoretical and experimental effort has been devoted to the study of the electronic properties these carbon cages present. However, although significant work has been done, the purpose of this paper is to provide a detailed theoretical analysis of the electronic properties of several fullerenes. We have calculated the electronic structure of these carbon cages within the valence effective Hamiltonian (VEH) approach. The calculated one-electron energy levels are correlated with experimental UPS spectra. The good correlation between calculated and experimental values shows VEH appr…
Liftings and extensions of operators in Brownian setting
2020
We investigate the operators T on a Hilbert space H which have 2-isometric liftings S with the property S ∗ S H ⊂ H . We show that such liftings are closely related to some extensions of T, which h...