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Measurements of Water-Air Flow Phenomena in a Chamber with a Rotating Shaft

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Journal of Thermal Science 2021年第1期30卷 242-247页

作者： TIUTIURSKI Paweł HERCEL paulina TELEGA Janusz KARDAŚDariusz Flow and Combustion Department Renewable Energy FacultyInstitute of Fluid Flow Machinery Polish Academy of SciencesFiszera 1480-231GdańskPoland Flow and Combustion Department Experimental Aerodynamics FacultyInstitute of Fluid Flow Machinery Polish Academy of SciencesFiszera 1480-231GdańskPoland

The paper concerns the phenomena of the fluid film that occurs in the bearing chamber of an aircraft *** geometry of the system includes two concentric cylinders,between which there is a mixture of oil and *** fluid circulates in a closed *** rotary movement of the inner cylinder causes creation of the fluid film on the walls of the *** article proposes a measurement method that is allowing observation of this fluid film and,in particular,analysis of the movement of the air bubbles occurring in the *** own model of the bearing chamber with transparent walls was constructed for the *** the investigation,water was used instead of *** of the behaviour of the flow was possible thanks to video recordings made with the use of a fast-capture *** results presented in the paper include velocity magnitudes of the air bubbles in the fluid film in dependence on the rotational speed of the shaft and water volume fraction and with a range from 0.37 to 0.91 m/*** results presented in this article can be used for the bearing chamber numerical models validation.

关键词： bearing chamber measurements fluid film velocity two-phase flow

Long-term engraftment of p18^(INK4C)-deficient hematopoietic stem cells is enhanced in the sublethally-irradiated recipients

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Science China(Life Sciences) 2006年第4期49卷 390-394页

作者： HUANG paulina SHIELDS Donna Hillman Cancer Center University of Pittsburgh Pittsburgh USA

Non-myeloablative regimens for host conditioning have been widely used in clinical hematopoietic stem cell transplantation due to their reduced toxicity on the recipients. But a milder conditioning regimen may require a higher engrafting ability of donor stem cells in competing with endogenous stem cells. Thus, new strategies for enhancing the competitiveness of donor stem cells in non-myeloablative recipients would have important implications for current clinical stem cell trans- plantation. It is known that the absence of p18INK4C (p18) gene can enhance the self-renewal potential of hematopoietic stem cells (HSCs). We applied the approach of competitive bone marrow trans- plantation to evaluate the impact of p18 gene deletion on long-term engraftment of HSCs in sub- lethally irradiated hosts. We found that p18?/? HSCs had a significant advantage over wild-type HSCs during long-term engraftment in the mouse recipients that received a sub-lethal irradiation (5-Gy). The engraftment efficiency of p18?/? HSCs in the sub-lethally irradiated recipients was similar to that in the lethally irradiated (10-Gy) recipients. Our current study demonstrates that enhanced engraftment of donor HSCs in the absence of p18 does not strictly depend on the dose of irradiation used for host conditioning. Therefore, p18 might serve as a potential drug target for increasing the efficacy of stem cell transplant in the patients that are preconditioned with either a myeloablative or non-myeloablative regimen.

关键词： p18INK4C (p18), hematopoietic stem cells (HSCs), engraftment efficiency, sublethal irradiation.

CD40L/CD40 bidirectional signaling is a major regulator of neuronal morphology in the developing nervous system

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Neural Regeneration Research 2021年第8期16卷 1539-1541页

作者： paulina Carriba Alun M.Davies School of Biosciences Cardiff UniversityMuseum AvenueCardiff CF103AXWalesUK

Appropriate nervous system function depends on a precise but plastic neural *** morphology determines how neurons interact with each other and with other *** kind of neuron has its own morphological characteristics,which are determined by both intrinsic and extrinsic *** addition to intrinsic genetic programmes and patterns of neural activity,a variety of extrinsic factors regulate the growth and branching of neural processes and synaptogenesis.

关键词： neural system precise

Perovskite type lanthanum manganite：Morpho-structural analysis and electrical investigations

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Journal of Rare Earths 2018年第5期36卷 499-504页

作者： Paula Sfirloaga Maria Poienar Iosif Malaescu Antoanetta Lungu paulina Vlazan Institute for Research and Development in Electrochemistry and Condensed Matter P. Andronescu Street No.1 300224 Timisoara Romania West University of Timisoara Vasile Parvan 4 300223 Romania

Perovskite-type oxides of LaMnO3 were synthesized by means of the sol-gel method, in the presence of citric acid as gelling agent. The precursors used were Mn（NO3）2·H2O, La2O3, and NaOH,mixed in the stoichiometric ratio to obtain perovskite materials. The obtained gel was heat-treated at 400, 600 and 800 ℃ respectively, for 6 h. X-ray diffraction and FT-IR spectroscopy were used to analyze the phase transformation as a function of temperature, and the Rietveld refinement was used in order to characterize the materials obtained structurally. The average crystallite size of the products was calculated from XRD data and the average particle size was measured from the TEM micrographs. At 600 ℃, the synthesized compound is well-crystallized, showcases a perovskite structure（Pm-3m space group）, and exhibits uniform and homogeneous hexagonally-shaped particles, with sizes in the 20-50 nm *** impedance measurements in the 20-2 × 10^6 Hz frequency range were carried out at different temperatures（26-115 ℃）, and the electrical conduction mechanism is discussed.

关键词： Rare earths Sol-gel method Physico-chemical properties Electrical investigations

Helicobacter Pylori Infection and Lung Cancer： New Insights and Future Challenges

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中国肺癌杂志 2018年第9期21卷 658-662页

作者： Ileana GONZALEZ paulina ARAYA Armando ROJAS Biomedical Research Laboratories Medicine Faculty Catholic University of Maule Talca Chile

Helicobacter pylori(H. pylori) is the causative agent of chronic gastritis and peptic ulcer diseases and is an important risk factor for the development functional dyspepsia, peptic ulceration, gastric adenocarcinoma and mucosa-associated lymphoid tissue lymphoma. H. pylori has very high rates of infection in human populations, and it is estimated that over 50% of the world population is infected. Recently, certain extra-gastric manifestations, linked to H. pylori infection, have been widely investigated. Noteworthy, a growing body of evidences supports an association between H. pylori infection with lung cancer. The present review intend to highlight not only the most recent evidences supporting this association, but also some missed points, which must be considered to validate this emerging association.

关键词：幽门螺杆菌慢性胃炎治疗方法临床分析

Identification of ISSR markers linked to flowering traits in a representative sample of Eucalyptus cladocalyx

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Journal of Forestry Research 2016年第2期27卷 239-245页

作者： Rodrigo Contreras-Soto paulina Ballesta Eduardo Ruiz Freddy Mora Department of Agronomy State University of Maring Department of Botany University of Concepción Institute of Biological Sciences University of Talca

Early flowering and flower abundance have long been considered desirable traits in eucalypt breeding programs. In particular, flowers of Eucalyptus cladocalyx provide a nectar source for the production of honey in arid ecosystems. To identify inter-simple sequence repeat （ISSR） markers that are associated with early flowering and flower abundance in the southern Atacama Desert, we used a sample of 47 trees, representing five Australian prove- nances of E. cladocalyx. A unified mixed linear model （which considered the effect of genetic structure and the kinship relationship among trees） revealed that three loci were significantly associated with early flowering, which accounted for 10-16 % of the phenotypic variation, while two loci accounted for 11-13 % in flowering intensity. Locus ISO1-500 bp was associated with both flowering traits. This result is consistent with our previous findings indicating that marker-assisted selection on early flowering should have significant and positive impact on flowering intensity. The application of marker-assisted selection to identify trees that flower early and intensively may increase honey production, a resource that generates additional income for the local farmers of the southern Atacama Desert.

关键词： Eucalyptus cladocalyx ISSR Floweringtraits Marker-assisted selection

Comprehensive Approach for Porous Materials Analysis Using a Dedicated Preprocessing Tool for Mass and Heat Transfer Modeling

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Journal of Thermal Science 2018年第5期27卷 479-486页

作者： MADEJSKI Pawel KRAKOWSKA paulina HABRAT Magdalena PUSKARCZYK Edyta JEDRYCHOWSKI Mariusz Department of Power Systems and Environmental Protection Facilities Faculty of Mechanical Engineering and Ro-botics AGH University of Science and TechnologyKraków 30-059 Poland Department of Geophysics Faculty of Geology Geophysics and Environmental Protection AGH University of Sci-ence and Technology Kraków 30-059 Poland Department of Geoinformatics and Applied Computer Science Faculty of Geology Geophysics and Environmental Protection AGH University of Science and TechnologyKraków 30-059 Poland Department of Condensed Matter Physics Faculty of Physics and Applied Computer Science AGH University of Science and TechnologyKraków 30-059 Poland

The paper presents a comprehensive, newly developed software – poROSE(poROus materials examination SoftwarE) for the qualitative and quantitative assessment of porous materials and analysis methodologies developed by the authors as a solution for emerging challenges. A low porosity rock sample was analyzed and thanks to the developed and implemented methodologies in poROSE software, the main geometrical properties were calculated. A tool was also used in preprocessing part of the computational analysis to prepare a geometrical representation of the porous material. The basic functions as elimination of blind pores in the geometrical model were completed and the geometrical model was exported for CFD software. As a result, it was possible to carry out calculations of the basic properties of the analyzed porous material sample. The developed tool allows to carry out quantitative and qualitative analysis to determine the most important properties characterized porous materials. In presented tool the input data can be images from X-ray computed tomography(CT), scanning electron microscope(SEM) or focused ion beam with scanning electron microscope(FIB-SEM) in grey level. A geometric model developed in the proper format can be used as an input to modeling mass, momentum and heat transfer, as well as, in strength or thermo-strength analysis of any porous materials. In this example, thermal analysis was carried out on the skeleton of rock sample. Moreover, thermal conductivity was estimated using empirical equations.

关键词： porous materials rock software thermal properties preprocessing

Tracing mechanism of optically and thermally stimulated luminescence in Lu2O3:Tb,M（M=Hf,Zr,Ti）ceramic storage phosphors

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Journal of Rare Earths 2019年第11期37卷 1170-1175页

作者： Malgorzata Sojka Dagmara Kulesza paulina Bolek Joanna Trojan-Piegza Eugeniusz Zych Faculty of Chemistry University of Wroclaw

A series of energy storage phosphors,Lu2O3:Tb,M(M=Hf,Zr,Ti),were investigated by means of photoand thermoluminescence techniques to compare the effect of the co-dopant from the same group of periodic table of elements on charge carriers trapping capability and trap *** of the investigated processes were tracked individually for the Tb3+in the two different metal sites offered by the Lu2O3 host-noncentrosymmetric C2 and centrosymmetric *** is proved that both Tb3+ions participate in hole trapping and electrons are immobilized in traps whose depths are defined by the *** traps,~1.79 eV,appear upon Ti addition,while Zr and Hf generate traps of very similar,~1.40-1.44 eV,*** stored energy may be released not only by means of thermal stimulation but also upon the impact of optical *** from the 390-430 nm range of wavelengths was found the most efficient in the latter *** deep red radiation of 780 nm releases most of the trapped electrons in Zr/Hf co-doped ceramics but is much less effective in the case of Tb,Ti *** scheme of electronic levels engaged in charge carriers trapping and subsequent generation of thermoand optically stimulated luminescence was constructed.

关键词： Storage phosphors Lu2O3 Thermoluminescence Optically stimulated luminescence Rare earths

Are we ready to use new endoscopic scores for ulcerative colitis?

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World Journal of Gastroenterology 2024年第10期30卷 1466-1469页

作者： Rodrigo Quera paulina Núñez F Universidad de los Andes Inflammatory Bowel Disease ProgramClinica Universidad de los AndesDigestive Disease CenterSantiago 7600976RMChile Digestive Disease Center Inflammatory Bowel Disease ProgramClínica Universidad de los AndesSantiago 7620157Chile Department of Gastroenterology Universidad de Chile-Hospital San Juan de DiosSantiago 770123Chile

For ulcerative colitis(UC),the variability in inflammatory activity along the colon poses a challenge in *** focus on achieving endoscopic healing in UC is evident,where the UC Endoscopic Index of Severity and Mayo Endoscopic Subscore are commonly used for ***,these indices primarily consider the most severely affected *** et al recent study validates the Toronto Inflammatory Bowel Disease Global Endoscopic Reporting(TIGER)score offering a comprehensive assessment of inflammatory activity across diverse segments of the colon and rectum and a reliable index correlating strongly with UC Endoscopic Index of Severity and moderately with Mayo Endoscopic Subscore(MES).Despite recommendation,certain aspects warrant further *** calprotectin,an intermediate target,correlates with TIGER and should be *** TIGER scores defining endoscopic remission and response,evaluating agreement with histological activity,and assessing inter-endoscopist agreement for TIGER require *** the correlation between TIGER and intestinal ultrasound,akin to MES,adds value.

关键词： Ulcerative colitis Sigmoidoscopy Colonoscopy Score index