检索结果-南通市图书馆

A review of synthetic methods for the production of upconverting lanthanide nanoparticles

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Innovative Optical Health Sciences 2014年第2期7卷 24-34页

作者： Christian F.Gainer marek Romanowski Department of Biomedical Engineering Uniuersity of Arizona Tucson AZ

Upconverting lanthanide nanoparticles overcome many of the problems ssociated with moretraditionally used luminescent contrast agents,such as photobleaching,autofluorescence,cyto-toxicity and *** this reason,they are an atractive choice for biomedical imagingapplications,particularly for imaging in living *** last decade has seen numerousimprovements to these nanocrystals,but a comprehensive guide to the synthesis of upconvertinglanthanide nanoparticles has not yet been *** vary from paper to paper and fromgroup to group,and results vary bet ween research groups for each *** this reason,development of these nanoparticles remains a signicant endeavor for any research groupinterested in joining the *** this review,we look at the varying synthetic methods employedover the last decade and detail methodology for a select few that have been favored in the field.

关键词： Rare earth nanocrystals upconversion imaging luminescence

Nodular regenerative hyperplasia:Evolving concepts on underdiagnosed cause of portal hypertension

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2011年第11期17卷 1400-1409页

作者： marek Hartleb Krzysztof Gutkowski Piotr Milkiewicz Department of Gastroenterology and Hepatology Medical University of Silesia40-752 KatowicePoland Liver Unit Pomeranian Medical University70-111 SzczecinPoland

Nodular regenerative hyperplasia(NRH)is a rare liver condition characterized by a widespread benign transformation of the hepatic parenchyma into small regenerative *** may lead to the development of non-cirrhotic portal *** are no published systematic population studies on NRH and our current knowledge is limited to case reports and case *** may develop via autoimmune,hematological,infectious,neoplastic,or drug-related *** disease is usually asymptomatic,slowly or nonprogressive unless complications of portal hypertension *** diagnosis is made by histopathology,which demonstrates diffuse micronodular transformation without fibrous *** of perinuclear collagen tissue distinguishes NRH from typical regenerative nodules in the cirrhotic *** the initial treatment is to address the underlying disease,ultimately the therapy is directed to the management of portal *** prognosis of NRH depends on both the severity of the underlying illness and the prevention of secondary complications of portal *** this review we detail the epidemiology,pathogenesis,diagnosis,management,and prognosis of NRH.

关键词： Nodular regenerative hyperplasia Portal hypertension Comorbidities

LHCb gets closer to discovering the second doubly charmed baryon

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2020年第2期63卷 25-26页

作者： marek Karliner Jonathan L.Rosner School of Physics and Astronomy Tel Aviv UniversityTel Aviv 69978Israel Enrico Fermi Institute and Department of Physics University of ChicagoChicagoIL 60637USA

Recently the LHCb Collaboration [1] published the results of a search for the doubly charmed baryon ■. No significant signal is seen in the mass range from 3.4 to3.8 Ge V. To put this result in context, the ■baryon was seen by LHCb in decay modes ΛcK-π^+π^+[2](2017) and ■^+cπ^+[3](2018). The weighted average of the ■^++cc mass is 3621.24±0.65 (stat.)±0.31 (syst.) MeV [3].

关键词： doubly closer LHCb

Nanoparticles Covered Surfaces for Post-functionalization with Aromatic Groups to Obtain Parahydrophobic Surface with High Water Adhesion （Petal Effect）

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2017年第3期14卷 468-475页

作者： Guilhem Godeau marek Dovcik Frederic Guittard Thierry Darmanin Universite Cote d'Azur NICE Lab 1MREDD Pare Valrose 061 O0 Nice France

Numerous exceptional properties can be observed in nature. Among these properties, parahydrophobic feature is of in- terest. This property describes material with high adhesion with water such as rose petals or gecko foot. Such kind of surface presents a real potential for applications in the field of water harvesting systems. In this work, we report a new synthetic strategy to mimic this property. Here, we combine three strategies in one, First, a monomer is electropolymerized in order to form the starting structured surface. Then, nanoparticles are grafted on the surface to increase the structuration and consequently to create the reactive surface. Finally, the grafted surface is post-functionalized （Huisgen reaction） with various aryl alkynes to control the surface chemistry and energy. This strategy allows to reach surfaces with both very high hydrophobic properties （0= 140~） and high water adhesion. This work also includes the surface wettability, roughness and morphology investigation in order to study the impact of the starting monomer structure and post-functionalization on the surface properties.

关键词： conductive polymers nanostructures click chemistry superhydrophobic adhesion

Luminescence intensification of lanthanide complexes by silver nanoparticles incorporated in sol-gel matrix

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare Earths 2009年第4期27卷 544-549页

作者： Renata Reisfeld marek Pietraszkiewicz Tsiala Saraidarov Viktoria Levchenko Inorganic Chemistry Department The Hebrew University of Jerusalem Givat-Ram 91940 Jerusalem Israel Institute of Physical Chemistry Polish Academy of Sciences 01-224 Warsaw Kasprzaka 44/52 Poland

We present how the luminescence of europium RR-2-P-oxides complexes can be increased by interaction of electronic levels of the complex with the radiation field of silver nanoparticles （NPs）. The procedure by which silver NPs are formed in a sol-gel polyurethane matrix precursor was elaborated. The formed Ag NPs were combined with Eu complex incorporated in ormocer matrix. The emission spectra of the complexes without silver NPs were compared with spectra of the same complexes with addition of silver NPs. As the result of the interaction of the electronic levels of lanthaaide ligands with silver plasmons, dramatic increase of luminescence was observed.

关键词： luminescence intensification Eu RR-2-P-oxides complexes silver nanoparticles silica-polyurethane zirconia-glymo particles size distribution rare earths

Marine transgression(s) to evaporite basin:The case of middle Miocene (Badenian) gypsum in the Central Paratethys, SE Poland

在线全文

学校读者我要写书评

暂无评论

Journal of Palaeogeography 2020年第3期9卷 335-352页

作者： Danuta Peryt Przemyslaw Gedl Tadeusz marek Peryt Institute of Paleobiology Polish Academy of SciencesTwarda 51/5500-818 WarszawaPoland institute of Geological Sciences Polish Academy of SciencesResearch Centre in CracowSenacka 131-002 KrakowPoland Polish Geological Institute-National Research Institute Rakowiecka 400-975 WarszawaPoland

The middle Miocene Badenian evaporite basin of the Carpathian Foredeep Basin was a saline lake, separated by a barrier from the sea and supplied with seawater seeping through the barrier or overflowing it occasionally in the form of short-lived marine transgressions. Such transgressions could leave behind marine microfossils in marly clay intercalations. One of them(2.3 m thick) occurs in the uppermost part of the sulphate sequence, in the unit ‘o’, in the Babczyn 2 borehole section. It contains marine palynomorphs(dinoflagellate cysts) and foraminiferal assemblages indicating a marine environment. The low-diversity benthic foraminiferal assemblages are dominated by opportunistic, shallow infaunally living species, preferring muddy or clayey substrate for thriving, brackish to normal marine salinity, and inner shelf environment. Dinoflagellate cyst assemblages, although taxonomically impoverished, consist of marine species;euryhaline forms that tolerate increased salinity are missing. Relatively common microfossils found in clay intercalations within gypsum have important palaeogeographical implications:they strongly suggest that there existed an additional inflow channel supplying the Polish Carpathian Basin from the south during the evaporite deposition and afterwards.

关键词： Evaporite basins Transgression Microfossils Badenian Palaeogeography Paratethys

Delineation of homogeneous forest patches using combination of field measurements and LiDAR point clouds as a reliable reference for evaluation of low resolution global satellite data

在线全文

学校读者我要写书评

暂无评论

Forest Ecosystems 2018年第1期5卷 1-12页

作者： krzysztof stereńczak marek lisańczuk yousef erfanifard department of forest resources management forest research instituteSekocin Stary 3 Braci Lesnej，05-090 Raszyn，Poland department ofnatural resources and environment college of agriculture shiraz universityp.o.box ***shiraziran

Backgrounds： There are many satellite systems acquiring environmental data on the world. Acquired global remote sensing datasets require ground reference data in order to calibrate them and assess their quality. Regarding calibration and validation of these datasets with broad geographical extents, it is essential to register zones which might be considered as Homogeneous Patches （HPs）. Such patches enable an optimal calibration of satellite data/sensors, and what is more important is an analysis of components which significantly influence electro-magnetic signals registered by satellite sensors. Methods： We proposed two structurally different methods to identify HPs： predefined thresholding-based one （static one）, and statistical thresholding-based technique （dynamic one）. In the first method, 3 different thresholds were used： 5%, 10%, and 20%. Next, it was aimed to assess how delineated HPs were spatially matched to satellite data with coarse spatial resolution. Selected cell sizes were 25, 50, 100, 250, and 500 m. The number of particular grid cells which almost entirely fell into registered HPs was counted （leaving 2% cell area tolerance level）. This procedure was executed separately for each variant and selected structural variables, as well as for their intersection parts. Results： The results of this investigation revealed that ALS data might have the potential in the identification of HPs of forest stands. We showed that different ALS based variables and thresholds of HPs definition influenced areas which can be treated as similar and homogeneous. We proved that integration of more than one structural variable limits size of the HPs, in contrast, visual interpretation revealed that inside such patches vegetation structure is more constant. Conclusions： We concluded that ALS data can be used as a potential source of data to ＂enlarge＂ small ground sample plots and to be used for evaluation and calibration of remotely sensed datasets provided by global systems

关键词： Forest structure Stratification Global satellite missions

The methodology of determining optimum access routes to remote areas for the purposes of crisis management

在线全文

学校读者我要写书评

暂无评论

International Journal of Digital Earth 2022年第1期15卷 1905-1928页

作者： Wojciech Dawid Krzysztof Pokonieczny marek Wyszyński Faculty of Civil Engineering and Geodesy Institute of Geospatial Engineering and GeodesyMilitary University of TechnologyWarsawPoland

The article presents a methodology to determine access routes to places with difficult access,situated outside the regular transport *** determine the optimum route,the existing road network was used,along with terrain passability maps,as well as high-resolution digital terrain models together with the traction parameters of the vehicle to enable conducting a detailed analysis of micro-relief and excluding inaccessible *** research was extended to include a comprehensive analysis of terrain accessibility for areas located in the vicinity of the capital cities of three European countries on various levels of economic development:Germany,Poland,and *** degree of development of the analysed area was determined with the use of the gross domestic product(GDP),human development index(HDI),and the road quality *** case study presented in the paper illustrates the practical application of the developed methodology that was implemented to a real crisis *** routes were determined for a MAN TGM 15.290 vehicle that went to take part in emergency action in buildings situated approximately 500 m away from paved *** developed methodology may be widely used in crisis management,where the emergency actions often require rescue units to access remote places.

关键词： Crisis management routing terrain accessibility fire departments OSM

Fault Detection under Fuzzy Model Uncertainty

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Automation and computing 2007年第2期4卷 117-124页

作者： marek Kowal Józef Korbicz Institute of Control and Computation Engineering University of Zielona Góraul. Podgórna 5065-246 Zielona GóraPoland

The paper tackles the problem of robust fault detection using Takagi-Sugeno fuzzy models. A model-based strategy is employed to generate residuals in order to make a decision about the state of the process. Unfortunately, such a method is corrupted by model uncertainty due to the fact that in real applications there exists a model-reality mismatch. In order to ensure reliable fault detection the adaptive threshold technique is used to deal with the mentioned problem. The paper focuses also on fuzzy model design procedure. The bounded-error approach is applied to generating the rules for the model using available measurements. The proposed approach is applied to fault detection in the DC laboratory engine.

关键词： Fault diagnosis fuzzy systems uncertainty noise.