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Wyświetlanie 1-15 z 563
Tytuł:
VvWRKY13 enhances ABA biosynthesis in Vitis vinifera
Autorzy:
Hao, J.
Ma, Q.
Hou, L.
Zhao, F.
Liu, X.
Powiązania:
https://bibliotekanauki.pl/articles/58583.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Botaniczne
Opis:
Abscisic acid (ABA) plays critical roles in plant growth and development as well as in plants’ responses to abiotic stresses. We previously isolated VvWRKY13, a novel transcription factor, from Vitis vinifera (grapevine), and here we present evidence that VvWRKY13 may regulate ABA biosynthesis in plants. When VvWRKY13 was ectopically expressed in Arabidopsis, the transgenic lines showed delayed seed germination, smaller stomatal aperture size, and several other phenotypic changes, indicating elevated ABA levels in these plants. Sequence analysis of several genes that are involved in grapevine ABA synthetic pathway identified WRKY-specific binding elements (W-box or W-like box) in the promoter regions. Indeed, transient overexpression of VvWRKY13 in grapevine leaves significantly increased the transcript levels of ABA synthetic pathway genes. Taken together, we conclude that VvWRKY13 may promote ABA production by activating genes in the ABA synthetic pathway.
Źródło:
Acta Societatis Botanicorum Poloniae; 2017, 86, 2
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vietnam freshwater environment
Problemy jakości wody do picia w Wietnamie
Autorzy:
Vinth, T. Q.
Thoi, N. K.
Bich Loc, N. T.
Powiązania:
https://bibliotekanauki.pl/articles/396516.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
Wietnam
woda pitna
jakość wody pitnej
zanieczyszczenia wód
Vietnam
freshwater quality
environment
Opis:
Vietnam is a tropical country, amount of rainfall is quite much, the network of rivers and lakes is high density. They make Vietnam become one of the countries that have large freshwater resources in Asian. However, freshwater quality in Vietnam is becoming worse, the pollution make the rivers and lakes become the problem that need to take care. It is because domestic wastewater and industries wastewater flow into rivers and lakes without treatment; the chemicals using for agricultures effect to groundwater make amount of heavy metals and chemicals be found high in fishes and vegetables raised, moreover, wastewater and its heavy metals and chemicals also pollute underground water; the rain take none- fresh air that from vehicles to water resources. The pollution is the serious problem of Vietnam. Researching the methods to decrease the water pollution and save water resources is belong to not only scientists but also everyone. We always make Vietnam become the country that have water potentials not only quantity but also quality.
Wietnam to tropikalny kraj, posiada dużo rzek i jezior, a opady atmosferyczne są obfite. Wszystko to czyni Wietnam krajem posiadającym wiele źródeł czystej wody. Jakość czystych wód niestety została pogorszona. Jest to poważny problemy, trzeba go brać pod uwagę i mieć pod ścisłą kontrolą. Przyczyną skażenia wód był brak kontrolowanych dopływów ścieków bytowych, ścieków przemysłowych do rzek i jezior. Stosowane środki chemiczne w rolnictwie powodują obecność metali ciężkich i składników chemicznych w rybach oraz w warzywach. Ponadto ścieki oraz spływy retencyjne z terenów uprawianych rolniczo powodują skażenie wody gruntowej. Zanieczyszczone wody stają się problemem w Wietnamie. Badania nad sposobami ograniczenia stopnia zanieczyszczenia wód i ratującymi źródła wody, to zadanie nie tylko dla naukowców, lecz też dla wszystkich ludzi, aby Wietnam pozostał krajem, który posiada potencjał ilościowy, a także jakościowy. Nie bez znaczenia są również wody opadowe na terenach uprzemysłowionych oraz na terenach wzmożonego ruchu pojazdów, które wnoszą do wód powierzchniowych znaczne ładunki zanieczyszczeń.
Źródło:
Civil and Environmental Engineering Reports; 2007, 2; 81-92
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vibration analysis of ball bearing considering waviness under high speed and an axial load
Autorzy:
Hou, P. P.
Wang, L. Q.
Peng, Q. Y.
Powiązania:
https://bibliotekanauki.pl/articles/201434.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
rotational speed
ball bearing
vibration characteristics
frequency band
RMS
Opis:
Based on the rolling bearing vibration measurement principle in ISO standard, a nonlinear dynamic model of ball bearing is built and motion equations of the inner ring, outer ring, and rolling elements are derived by using Lagrange’s equation. The ball bearing model includes the influence of waviness, rotational speed, external load, arbor supporting stiffness and arbor eccentricity. Ball bearing high-speed vibration tests are performed and used to verify the theoretical results. Simulated results showed that specific waviness orders produced the principal frequencies that were proportional to rotational speed. Rotational speed mainly affected the value of the natural frequency of the bearing system, and RMS (Root Mean Square) of the full band had a great fluctuation with the increase of rotational speed. In the experiment, spectrum and RMS of 2 ƒs-30 kHz (ƒs : the rotational frequency of inner ring/arbor) under high speed could include not only the influence of rotational speed but also principal frequencies produced by waviness, which could cover the part of requirements of the standard bearing vibration measurement.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 3; 517-527
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vasodilating, spasmolytic, inotropic and chronotropic activities of curcuminoids from Curcuma longa in isolated organ preparations of guinea pigs
Autorzy:
Jamil, Q.U.A.
Iqbal, S.M.
Jaeger, W.
Studenik, C.
Powiązania:
https://bibliotekanauki.pl/articles/69618.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Fizjologiczne
Tematy:
Curcuma longa
curcumin
demethoxycurcumin
bisdemethoxycurcumin
chemical structure
spasmolytic activity
guinea pig
vasodilation
pulmonary artery
Źródło:
Journal of Physiology and Pharmacology; 2018, 69, 3
0867-5910
Pojawia się w:
Journal of Physiology and Pharmacology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variational principles for set-valued mappings with applications to multiobjective optimization
Autorzy:
Bao, T. Q.
Mordukhovich, B. S.
Powiązania:
https://bibliotekanauki.pl/articles/970283.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
multiobjective optimization
variational principles
generalized differentiation
necessary optimality and suboptimality conditions
Opis:
This paper primarily concerns the study of general classes of constrained multiobjective optimization problems (including those described via set-valued and vector-valued cost mappings) from the viewpoint of modern variational analysis and generalized differentiation. To proceed, we first establish two variational principles for set-valued mappings, which-being certainly of independent interest-are mainly motivated by applications to multiobjective optimization problems considered in this paper. The first variational principle is a set-valued counterpart of the seminal derivative-free Ekeland variational principle, while the second one is a set-valued extension of the subdifferential principle by Mordukhovich and Wang, formulated via an appropriate subdifferential notion for set-valued mappings with values in partially ordered spaces. Based on these variational principles and corresponding tools of generalized differentiation, we derive new conditions of the coercivity and Palais-Smale types ensuring the existence of optimal solutions to set-valued optimization problems with noncompact feasible sets in infinite dimensions and then obtain necessary optimality and suboptimality conditions for nonsmooth multiobjective optimization problems with general constraints, which are new in both finite-dimensional and infinite-dimensional settings.
Źródło:
Control and Cybernetics; 2007, 36, 3; 531-562
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
UV-Vis spectroscopic detection coupled with chemometrics for the measurement of mixed organic acids in water samples enriched by radial electric focusing solid phase extraction
Autorzy:
Guo, Y.
Liu, X.
Liu, J.
Bian, X.
Zhang, Q.
Pan, J.
Wan, D.
Powiązania:
https://bibliotekanauki.pl/articles/221808.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
chemometrics
UV-Vis spectrophotometer
radial electric focusing solid phase extraction
mixed organic acids
Opis:
Due to the difficulty of detecting traces of organic acid mixture in an aqueous sample and the complexity of resolving UV-Vis spectra effectively, a combinatory method based on a self-made radical electric focusing solid phase extraction (REFSPE) device, UV-Vis detection and partial least squares (PLS) calculation is proposed here. In this study, REFSPE was used to enhance the extraction process of analytes between the aqueous phase and the membrane phase to enrich the trace of mixed organic acid efficiently. Then, the analytes, which were eluted from the adsorption film by ethanol with the assistance of an ultrasonic cleaning machine, were detected with UV-Vis spectrophotometry. After that, the PLS method was introduced to solve the problem of overlapping peaks in UV-Vis spectra of mixed substances and to quantify each compound. The linearly dependent coefficients between the predicted value of the model and the actual concentration of the sample were all higher than 0.99. The limit values of detection for benzoic acid, phthalic acid and p-toluene sulfonic acid were found at 9.9 μg/L, 12.2 μg/L and 13.8 μg/L with the relative recovery values between 84.8% and 117.9%. The RSD (n = 20) values of each component are 1.17%, 1.11% and 0.86%, respectively. Therefore, the proposed combined method can determine traces of complex materials in an aqueous sample efficiently and has wonderful potential applications.
Źródło:
Metrology and Measurement Systems; 2018, 25, 2; 317-329
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using complex networks to understand the mental lexicon
Autorzy:
Vitevitch, Michael S.
Goldstein, Rutherford
Siew, Cynthia S.Q.
Castro, Nichol
Powiązania:
https://bibliotekanauki.pl/articles/1151864.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
mental lexicon
network science
word recognition
word production
Opis:
Network science is an emerging discipline drawing from sociology, computer science, physics and a number of other fields to examine complex systems in economical, biological, social, and technological domains. To examine these complex systems, nodes are used to represent individual entities, and links are used to represent relationships between entities, forming a web-like structure, or network, of the entire system. The structure that emerges in these complex networks influences the dynamics of that system. We provide a short review of how this mathematical approach has been used to examine the structure found in the phonological lexicon, and of how subsequent psycholinguistic investigations demonstrate that several of the structural characteristics of the phonological network influence various language-related processes, including word retrieval during the recognition and production of spoken words, recovery from instances of failed lexical retrieval, and the acquisition of word-forms. This approach allows researchers to examine the lexicon at the micro-, meso-, and macro-levels, holding much promise for increasing our understanding of language-related processes and representations.    
Źródło:
Yearbook of the Poznań Linguistic Meeting; 2014, 1, 1
2449-7525
Pojawia się w:
Yearbook of the Poznań Linguistic Meeting
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using a vision cognitive algorithm to schedule virtual machines
Autorzy:
Zhao, J.
Mhedheb, Y.
Tao, J.
Jrad, F.
Liu, Q.
Streit, A.
Powiązania:
https://bibliotekanauki.pl/articles/330838.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
cloud computing
vision cognitive algorithm
VM scheduling
simulation
chmura obliczeniowa
algorytm poznawczy
szeregowanie
symulacja
Opis:
Scheduling virtual machines is a major research topic for cloud computing, because it directly influences the performance, the operation cost and the quality of services. A large cloud center is normally equipped with several hundred thousand physical machines. The mission of the scheduler is to select the best one to host a virtual machine. This is an NP-hard global optimization problem with grand challenges for researchers. This work studies the Virtual Machine (VM) scheduling problem on the cloud. Our primary concern with VM scheduling is the energy consumption, because the largest part of a cloud center operation cost goes to the kilowatts used. We designed a scheduling algorithm that allocates an incoming virtual machine instance on the host machine, which results in the lowest energy consumption of the entire system. More specifically, we developed a new algorithm, called vision cognition, to solve the global optimization problem. This algorithm is inspired by the observation of how human eyes see directly the smallest/largest item without comparing them pairwisely. We theoretically proved that the algorithm works correctly and converges fast. Practically, we validated the novel algorithm, together with the scheduling concept, using a simulation approach. The adopted cloud simulator models different cloud infrastructures with various properties and detailed runtime information that can usually not be acquired from real clouds. The experimental results demonstrate the benefit of our approach in terms of reducing the cloud center energy consumption.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2014, 24, 3; 535-550
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of fluorescence quantitative polymerase chain reaction (PCR) for the detection of Escherichia coli adhesion to pig intestinal epithelial cells
Autorzy:
Dai, C.H.
Gan, L.N.
Qin, W.U.
Zi, C.
Zhu, G.Q.
Wu, S.L.
Bao, W.B.
Powiązania:
https://bibliotekanauki.pl/articles/31510.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
An efficient and accurate method to test Escherichia coli (E. coli) adhesion to intestinal epithelial cells will contribute to the study of bacterial pathogenesis and the function of genes that encode receptors related to adhesion. This study used the quantitative real-time polymerase chain reaction (qPCR) method. qPCR primers were designed from the PILIN gene of E. coli F18ab, F18ac, and K88ac, and the pig β-ACTIN gene. Total deoxyribonucleic acid (DNA) from E. coli and intestinal epithelial cells (IPEC-J2 cells) were used as templates for qPCR. The 2−ΔΔCt formula was used to calculate the relative number of bacteria in cultures of different areas. We found that the relative numbers of F18ab, F18ac, and K88ac that adhered to IPEC-J2 cells did not differ significantly in 6-, 12-, and 24-well culture plates. This finding indicated that there was no relationship between the relative adhesion number of E. coli and the area of cells, so the method of qPCR could accurately test the relative number of E. coli. This study provided a convenient and reliable testing method for experiments involving E. coli adhesion, and also provided innovative ideas for similar detection methods.
Źródło:
Polish Journal of Veterinary Sciences; 2016, 19, 3
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Urinary concentrations and determinants of pyrethroid metabolites in pregnant women from non-rural areas of Yunnan, China
Autorzy:
Xu, Q.
Song, X.
Li, Y.
Jian, X.
Chen, S.
Chen, Y.
Powiązania:
https://bibliotekanauki.pl/articles/28762713.pdf
Data publikacji:
2021
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2021, 28, 4; 627-632
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unravelling the Effect of Anthraquinone Metal Salts as Wide-range Plateau Catalysts to Enhance the Combustion Properties of Solid Propellants
Autorzy:
Wang, Y.
Yan, Q.-L.
An, T.
Chen, B.
Ji, Y.-P.
Wang, W.
Zhao, F.
Powiązania:
https://bibliotekanauki.pl/articles/358042.pdf
Data publikacji:
2018
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
solid propellants
burning rate catalysts
anthraquinone metal salts
wide-range plateau combustion
Opis:
Novel lead and copper salts based on anthraquinone, including 1,8-dihydroxyanthraquinone,1,4,5,8-tetrahydroxyanthraquinone and 1,8-dihydroxy-4,5-dinitroanthraquinone, were prepared and characterized by Fourier transform infrared spectroscopy (FTIR), elemental analysis (EA), and X-ray fluorescence (XRF). The catalytic effects of these compounds on the decomposition of nitrocellulose (NC) and on the combustion properties of double-base (DB) and composite modified double-base (CMDB) propellants were comprehensively investigated. The results demonstrated that the burning rate is significantly increased (by 200%) in the lower pressure range (2-6 MPa) as compared to the control systems without added anthraquinone-based salts. Concurrently, the pressure exponents (n) were obviously lower, exhibiting a “wide-range plateau” combustion phenomenon in the middle-pressure region. Specifically, for the DB propellants such a plateau region extended from 10 MPa to 16 MPa for n equal to 0.10, from 10 MPa to 18 MPa for n equal to 0.11 and from 8 MPa to 18 MPa when n is 0.05. In the case of RDX-CMDB propellants, the plateau was found to be in the range 6-18 MPa, with n in the range 0.16-0.27, depending on the type of catalyst, in contrast to the reference CMDB sample, which was characterized by n equal to 0.7 for the same pressure range.
Źródło:
Central European Journal of Energetic Materials; 2018, 15, 2; 376-390
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Understanding of the role of pH in filling mesoporous silica with magnetic nanoparticles
Autorzy:
Wolak, W.
Dudek, M. R.
Ho, D. Q.
Marcjan, K.
Powiązania:
https://bibliotekanauki.pl/articles/122632.pdf
Data publikacji:
2016
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
mesoporous silica
magnetic nanoparticles
point of zero charge
mezoporowata krzemionka
nanocząstki magnetyczne
Opis:
Computer simulation study of filling pores of mesoporous silica with magnetic iron oxide nanoparticles which are diffusing towards the silica surface from a water solution with a given pH was presented. Three different values of the pH of the solution were under consideration, pH = 4, 7, and 10. The size of nanoparticles was of the order of magnitude of the nanopore diameter. It was observed that in the case of a low concentration of magnetic nanoparticles in the water solution the process of filling the silica pores weakly depends on the pH of the solution. The value of pH becomes only relevant for large concentration of magnetic nanoparticles. In the simulation, a 2-state Potts model was used for preparing the silica matrix. Diffusion of magnetic nanoparticles was restricted to lattice sites only.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2016, 15, 1; 191-196
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Under Pressure DFT Investigations on Optical and Electronic Properties of PbZrO₃
Autorzy:
Nazir, G.
Tariq, Saad
Afaq, A.
Mahmood, Q.
Saad, S.
Mahmood, A.
Tariq, Samar
Powiązania:
https://bibliotekanauki.pl/articles/1030608.pdf
Data publikacji:
2018-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
density functional theory
optical properties
electronic structure
high pressure
Opis:
In this article, density functional theory has been used to investigate the structural and optoelectronic properties of PbZrO₃ (PZO) under pressure from 0 to 350 GPa. In order to achieve ground state structural stability, generalized gradient approximations has been utilized. By studying electronic properties, indirect band-gap nature of PZO appears to change at 15 GPa to direct band-gap. Optical analysis include under pressure responses of real and imaginary parts of dielectric function, optical conductivity, optical absorption coefficient, energy loss function, refractive index, reflectivity and extinction coefficient. Most of the results have been found to be consistent with literature. Study reveals that static dielectric constant and band-gap are in accordance with the Penn model which validates our computed results. Moreover, static dielectric constant and static refractive index directly increases with pressure. Material preserves its positive value of refractive index at all pressures and therefore, it is not a negative index metamaterial. Plasma frequency increases directly with pressure that destabilize the under study material. Our results could be very useful for developing novel optoelectronic devices based on PZO suitable to work under extreme conditions.
Źródło:
Acta Physica Polonica A; 2018, 133, 1; 105-113
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unbundeled Shares: Circumventing Corporate Nationality Rules Through Swaps, Options and Other Devices
Autorzy:
Geronimo, Russell Stanley Q.
Powiązania:
https://bibliotekanauki.pl/articles/643539.pdf
Data publikacji:
2018-11-17
Wydawca:
Uniwersytet Gdański. Centrum Prawa Samorządowego i Prawa Finansów Lokalnych
Opis:
Corporate nationality clauses have a simple and seemingly innocuous language: “corporations at least X per centum of whose capital is owned by Filipino citizens”. This presupposes that “capital” is a unified bundle of economic and control rights. However, modern finance and contract law can “unbundle” economic rights from control rights through the use of options, swaps, forwards, hybrid instruments, variable interests, and a vast catalogue of contractual arrangements. Unbundled economic rights allow foreign investors to have economic interest without ownership of shares, and unbundled control rights allow foreign minority stockholders to have effective control without majority of voting rights. Does this circumvent foreign equity limitations? Do the control test, beneficial ownership doctrine and other corporate nationality rules render them illegal?
Źródło:
Financial Law Review; 2018, 11, 3; 13-45
2299-6834
Pojawia się w:
Financial Law Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tunable Entanglement Sudden Death and Birth in Cavity QED with Nonlinear Kerr-Like Medium
Autorzy:
He, Q.
Xu, J.
Powiązania:
https://bibliotekanauki.pl/articles/1493398.pdf
Data publikacji:
2011-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.65.Ud
03.67.-a
03.67.Mn
Opis:
The influence of nonlinear Kerr-like medium on the phenomenon of entanglement sudden death and birth in a double Jaynes-Cummings model is investigated. It is shown that the entanglement sudden death and birth phenomenon may appear in this system and the duration of entanglement sudden death and birth can be controlled by the nonlinear Kerr-like medium. Particularly, the phenomenon of entanglement sudden death and birth disappears one after another if we increase the value of the Kerr coefficient χ continuously, and all disappears if the value of the Kerr coefficient χ is large enough.
Źródło:
Acta Physica Polonica A; 2011, 120, 3; 390-396
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 563

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