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1
Content available remote Synthesis and electronic properties of pentacene derivatives as promising n-type semiconductor candidates
100%
Liu C. , Tang Y. , Nie S.
Open Chemistry
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2006
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tom 4
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nr 4
723-731
EN
Two pentacene derivatives 1 and 2 were synthesized from the Diels-Alder reactions of furan derivatives with 1,4-benzoquinone. They were characterized by the methods of 1H - nuclear magnetic resonance spectroscopy (1H-NMR), matrix-assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOF MS), ultraviolet and visible spectrophotometry (UV-VIS), photoluminescence (PL) spectrometry and cyclic voltammetry (CV). The energy gaps of 1 and 2, taken directly from spectroscopic measurements, are broad as 2.72 and 2.46 eV, leading to blue and greenish blue photoluminescence, respectively. The LUMO and HOMO energy levels are −2.77 and −5.49 eV for 1, and −2.91 and −5.37 eV for 2, respectively. The low energy levels make both 1 and 2 good air-stabilities and promising n-type semiconductor candidates for use in organic electronics.
2
Content available remote Multiconfiguration Dirac-Fock results for forbidden transitions in the 2p 4 configuration
88%
Hu F. , Yang J. , Wang C. , Jiang G. , Zhao X. , Zang H.
Open Physics
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2011
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tom 9
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nr 5
1228-1236
EN
Relativistic configuration interaction calculations with the inclusion of the Breit interaction, quantum electrodynamics and finite nuclear mass corrections have been carried out in the extended optimal level scheme using multiconfiguration Dirac-Fock wavefunctions on the forbidden transition probabilities for the 2p 4 ground state configuration of the oxygen isoelectronic sequence for 8 ⩽ Z ⩽ 42. Electric quadrupole and magnetic dipole transition probabilities are reported for transitions between several of these levels. Our results are compared with those from other theories and experiments. Our energy levels are in better agreement with experiment than other theories.
3
Effect of labour organisation on the level of energy expenditure and static loads of a worker in intermediate cutting
63%
Stempski W.
Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria
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2009
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tom 08
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nr 2
EN
The aim of the performed experiments was to assess energy expenditure and static loads of the operator of a chain sawing machine harvesting timber in a pine stand intermediate cutting. The investigations included two technological variants. In variant I, all technological operations were carried out by one worker – operator of the chain saw, while in treatment II the operations were carried out by a team of three persons – two operators of chain sawing machines and a helper. The energy expenditure was determined on the basis of measurements of the ventilation of lungs, whereas the static load – using the OWAS method. The determined net unit energy expenditures of the chain saw operators in the experimental variants exceeded 20 kJ•min-1 and differed statistically significantly between one another. With regard to static loads, a greater proportion of positions negatively affecting the muscle-skeletal system of the operator were found in variant II.
PL
W pracy oceniono wydatek energetyczny i obciążenie statyczne operatora pilarki pozyskującego drewno w trzebieży drzewostanu sosnowego. Badaniami objęto dwa warianty technologiczne, różniące się organizacją pracy. W wariancie I wszystkie zabiegi technologiczne wykonywał jeden robotnik – operator pilarki, w wariancie II pracowało dwóch operatorów pilarek i pomocnik. Wydatek energetyczny określono na podstawie pomiaru wentylacji płuc, a obciążenie statyczne metodą OWAS. Uzyskane jednostkowe wydatki energetyczne netto operatora pilarki w wariantach przekraczały 20 kJ•min-1 i różniły się między sobą statystycznie istotnie. W obciążeniach statycznych w wariancie II stwierdzono większy udział pozycji niekorzystnie wpływających na układ mięśniowo-szkieletowy operatora.
4
The assessment of the level of energy expenditure of forest workers dislodging trees hang during early thinning
63%
Sowa J. M. , Kulak D.
Zeszyty Naukowe Akademii Rolniczej w Krakowie. Sesja Naukowa
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2005
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tom 91
367-373
5
Influence of ration with reduced energy level on some histopatological changes, intramuscular fat and connective tissue in musculus longissimus dorsi over latter fattening period of young bulls
63%
Oler A. , Walasik K.
Polish Journal of Food and Nutrition Sciences
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2007
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tom 57
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nr 4[B]
6
Sexual maturity and productivity response of pullets fed varying energy levels in The Tropics
63%
Adeyemo A. I. , Longe O. G.
Roczniki Naukowe Zootechniki
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2000
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tom 27
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nr 4
7
Content available Energy levels of soil moisture and bioproductivity
63%
Christov I. D.
International Agrophysics
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1992
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tom 06
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nr 1-2
8
Content available Influence of energy level reduction in young bulls diet on meat quality
51%
Mlynek K. , Oler A. , Walasik K. , Zielinska K.
Annals of Warsaw University of Life Sciences - SGGW. Animal Science
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2019
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tom 58[2]
9
Changes in the allometric parameters of intestinal segments, some internal organs and apparent ileal digestibility of nutrients in chickens fed prestarter diets differing in the energy: protein ratio and amino acid content
51%
Wertelecki T. , Jamroz D.
Polish Journal of Natural Sciences. Supplement
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2006
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tom 03
549-556
10
Effect of methionine and energy level in high protein organic diets fed to laying hens
51%
Koreleski J. , Swiatkiewicz S.
Annals of Animal Science
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2010
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tom 10
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nr 1
83-91
11
Effect of reduced dietary energy levels and vitamin C and E supplementation on the performance and some physiological parameters of broiler chickens exposed to elevated air temperatures
51%
Sosnowka-Czajka E. , Skomorucha I. , Herbut E.
Polish Journal of Natural Sciences. Supplement
|
2006
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tom 03
517-522
12
Effects of different energy levels and ambient temperatures on serum thyroid hormones and some biochemical values in Holstein steers
51%
Guler T. , Kul S. , Ertas O. N.
Medycyna Weterynaryjna
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2006
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tom 62
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nr 01
EN
This 2x2 factorial study was designed to test the effects of different diet energy levels (Low: 5.39 NEf MJ/kg and High: 6.60 NEf MJ/kg) and environmental temperature (Low: 19.84°C and High: 28.5°C) on triiodothyronine (T₃), thyroxine (T₄) and blood serum parameters of Holstein steers. A total of 28 10-month old steers were divided into 4 groups, each containing 7 steers. According to this design, steers which were subjected to housing in barns were either offered normal energy (Barn-NE group) or high energy (Barn-HE group) diets; steers which were subjected to housing outside were also either offered normal energy (Outside-NE group) or high energy (Outside-HE group) diets. The highest levels of T₃ and T₄ were in the Outside-HE group followed by Outside-NE group, Barn-HE group and Barn-NE group, respectively (p<0.05). Serum glucose, cholesterol and triglyceride levels were higher in all the outside groups (p<0.05). No differences were found between the groups in the total protein, albumin, uric acid, inorganic phosphor, Ca, Na and K levels. The levels of SCOT, SGPT, amylase, alkaline phosphates and creatinin were similar in all groups. The results of the study indicated that increasing energy levels and ambient temperatures increased T₃ and T₄ levels and did not affect serum metabolites except for glucose, cholesterol and triglyceride.
13
Effects of protected methionine and variable energy supply on lactational responses in dairy cows fed grass silage-based diets
51%
Kowalski Z. M. , Pisulewski P. M. , Gorgulu M.
Journal of Animal and Feed Sciences
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2003
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tom 12
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nr 3
14
Productivity and body composition of Black-headed Mutton sheep x Polish Merino crossbreed rams fed complete pelleted mixtures with different energy concentrations
51%
Urbaniak M. , Potkanski A. , Frankiewicz A. , Przybecka I. , Matyniak J.
Journal of Animal and Feed Sciences
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2000
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tom 09
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nr 4
15
Tissue protein and energy deposition in White-headed Mutton sheep x Polish Merino crossbred rams fed diets with different energy values
51%
Urbaniak M. , Frankiewicz A. , Lyczynski A. , Mroczyk W. , Wasilewski Z. , Zawadzka B. , Kulik M.
Journal of Animal and Feed Sciences
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2001
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tom 10
|
nr 2
16
Zdolnosc opasowa buhajkow czarno-bialych zywionych w koncowej fazie opasu dawka o obnizonym poziomie energii
44%
Chaberski R. , Oler A.
Acta Scientiarum Polonorum. Zootechnica
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2005
|
tom 04
|
nr 1
39-47
17
Szacowanie poziomu energii strawnej w kiszonkach z zawartości składników pokarmowych
38%
Pys J. B.
Acta Agraria et Silvestria. Series Zootechnica
|
1991
|
tom 29
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