检索结果-南通市图书馆

Advanced Photonics 2021年第2期3卷 38-60页

作者： Abdul Rahim artur Hermans Benjamin Wohlfeil Despoina Petousi Bart Kuyken Dries Van Thourhout Roel Baets Ghent University Photonics Research GroupDepartment of Information TechnologyGhentBelgium Ghent University IMEC and Center for Nano-and BiophotonicsGhentBelgium ADVA Optical Networking BerlinGermany

Optical links are moving to higher and higher transmission speeds while shrinking to shorter and shorter ranges where optical links are envisaged even at the chip *** scaling in data speed and span of the optical links demands modulators to be concurrently performant and *** photonics(SiPh),a photonic integrated circuit technology that leverages the fabrication sophistication of complementary metal-oxide-semiconductor technology,is well-positioned to deliver the performance,price,and manufacturing volume for the high-speed modulators of future optical communication *** has relied on the plasma dispersion effect,either in injection,depletion,or accumulation mode,to demonstrate efficient high-speed *** high-speed plasma dispersion silicon modulators have been commercially deployed and have demonstrated excellent *** years have seen a paradigm shift where the integration of various electro-refractive and electro-absorptive materials has opened up additional routes toward performant SiPh *** modulators are in the early years of their *** promise to extend the performance beyond the limits set by the physical properties of *** focus of our study is to provide a comprehensive review of contemporary(i.e.,plasma dispersion modulators)and new modulator implementations that involve the integration of novel materials with SiPh.

关键词： high-speed modulators silicon photonics plasma dispersion effect ferroelectrics graphene III-V on Si organic(electro-optic)materials.

Characterization of Woody Vegetation in Different Land Uses in the Commune of Coubalan (Bignona Department, Senegal)

在线全文

学校读者我要写书评

暂无评论

American Journal of Plant Sciences 2023年第11期14卷 1343-1359页

作者： Francis artur Gomez Ismaïla Coly Arfang Ousmane Kémo Goudiaby Mohamed Ndao Agroforestry and Ecology Laboratory (LAFE) Department of Agroforestry Assane Seck University Ziguinchor Senegal

Woody vegetation provides a number of ecosystem services, including soil protection, carbon sequestration and oxygen production. Despite its important role in maintaining ecological balance, woody vegetation is currently undergoing continuous degradation due to climatic hazards and anthropogenic actions. As a result, it is essential to gather information for the sustainable and rational management of woody formations. It is with this in mind that this study aims to contribute to a better understanding of the state of woody vegetation in the different land-use types in Basse Casamance. To this end, stratified random sampling of woody vegetation was carried out in the different land-use types (fields, fallow land and forests) of the Coubalan commune. The sampling unit for fields and fallows was a 2500 m2 plot, and for forests was a 900 m2 plot. A total of 53 species, divided into 48 genera belonging to 22 families, were inventoried in the commune. Structural parameters were higher in the forest, with 1321.3 ± 635.8 individuals/ha, 13.09 ± 0.1 m2 and 79.25% ± 21.08% respectively for observed density, basal area and cover rate. As for dendrometric parameters, they are higher in the fields, with 20.4 ± 13.6 cm and 7.4 ± 3.8 m respectively for trunk diameter and woody height. Fallow land is characterized by species with low dendrometric parameters. These results provide a useful database for rational management of the various land-use types in the commune of Coubalan.

关键词： Lower Casamance Forest Fallow Field Woody Vegetation

A potential engineering solution to facilitate upstream movement of fish in mountain rivers with weirs:Southern Carpathians,the Azuga River

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 Mountain Science 2020年第3期17卷 501-515页

作者： Razvan VOICU artur RADECKI-PAWLIK Tomasz TYMINSKI Marian MOKWA Robbin SOTIR Liliana VOICU Ecohidrology and Water Quality Protection Service National Institute of Hydrology and Water ManagementBucharest 013686Romania Division of Structural Mechanics and Material Mechanics Faculty of Civil EngineeringCracow University of TechnologyKrakow 31-155Poland Institute of Environmental Engineering Wroclaw University of Environmental and Life SciencesWroclaw 50-363Poland Robbin Sotir&Associates Inc.3602 Ernest W.Barrett Parkway MariettaGeorgia 30064-2732USA

An important aspect in the restoration of longitudinal connectivity in rivers and streams is the implementation of fish migration systems at the upstream of the functional hydraulic structures(weirs,drop structures or river sills).The diversity of these existing structures as well as the different locations of these weirs within the river,watershed and riparian zone challenge the design engineers to find new holistic solutions for fish migration *** Azuga River study area requires a new synergistic fish migration design *** a mountain area,rapid increase in water level is quite frequent,especially after heavy or prolonged rainfalls and during spring snow ***,it is necessary to design a specific system for fish migration to meet this location’s *** to the characteristics in this location of the Azuga river,the classic fish migration systems would not be *** indigenous/mountain trout is considered as the target species in this *** this is a good swimming species,the use of classical systems could,due to exhaustion,prevent and/or reduce the movement of fish upstream of the two weirs(also known as river sills).This new,comprehensive solution,presented in this paper includes:(i)the restoration and stabilization works of the right bank in the weir study area by using biotechnical measures and(ii)the upstream migration system itself-for supporting the migration of fish on the Azuga River.

关键词： Weir Fish migration system Brown trout Mountainriver Soilbioengineering Connectivity

Trace elements and stable sulfur isotopes in plants of acid mine drainage area:Implications for revegetation of degraded land

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2020年第8期32卷 128-136页

作者： Agnieszka Gałuszka Zdzisław MMigaszewski Andrzej Pelc Andrzej Trembaczowski Sabina Doł˛egowska artur Michalik Geochemistry and the Environment Division Institute of ChemistryJan Kochanowski University7 Uniwersytecka St.25-406 KielcePoland Mass Spectrometry Laboratory Institute of PhysicsMaria Curie-Skłodowska University1 Maria Curie-Skłodowska Sq.20-031 LublinPoland

The abundances of trace elements,a low pH of water and soil in areas impacted by the acid mine drainage(AMD)may cause an excessive uptake of potentially toxic elements and nutritional imbalances in ***-tolerant,native plants are used for revegetation of degraded mining *** established levels of selected trace elements and stable sulfur isotopes in the above-ground plant biomass collected in a mining area in south-central *** 2016,20 samples of the most common species were collected from sites with a different influence of acid mine drainage and analyzed for trace elements by the inductively coupled plasma mass spectrometry *** the basis of the results obtained in 2016,the most contaminated site was selected for a more detailed study,in which sulfur contents and stable sulfur isotope ratios were determined together with trace elements in 17 *** results confirmed that the plants native to the AMD area efficiently accumulated trace elements,especially As and rare earth *** showed the highest content of trace elements,but exhibited the lowest concentrations of sulfur accompanied by the highestδ34S *** has been shown for the first time that stable sulfur isotope composition of AMD plants in south-central Poland is significantly depleted in the 34S isotope showing an averageδ34 S value of–10.5‰in comparison with positiveδ34S values in local vegetation growing outside the AMD area and in local precipitation.

关键词： Trace elements Stable sulfur isotopes Pyrite oxidation Rare earth elements Plants

Spontaneous rupture of a mucinous cystic neoplasm of the liver resulting in a huge biloma in a pregnant woman:A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2021年第30期9卷 9114-9121页

作者： artur Kośnik Anna Stadnik Benedykt Szczepankiewicz Waldemar Patkowski Maciej Wójcicki Liver and Internal Medicine Unit Medical University of WarsawWarsaw 02-097Poland Department of Radiology Medical University of WarsawWarsaw 02-097Poland Department of Pathology Medical University of WarsawWarsaw 02-097Poland Department of General Transplantand Liver SurgeryMedical University of WarsawWarsaw 02-097Poland

BACKGROUND Mucinous cystic neoplasm of the liver(MCN-L)and intraductal papillary neoplasm of the bile duct(IPN-B)are two different types of mucin-producing bile duct tumour that may complicate the course of *** the best of our knowledge,we describe herein the first case of MCN-L with spontaneous rupture during pregnancy necessitating complex surgical *** SUMMARY A 24-year-old woman was initially admitted to another hospital in October 2018 with signs of jaundice(serum bilirubin level 12 mg/dL)and upper abdominal pain radiating to the left *** magnetic resonance imaging(MRI)of the abdominal cavity revealed a multilocular cystic tumour of the liver hilum(37 mm×40 mm in diameter)located between segments 3 and 4 of the left liver *** weeks later(December 2018),the patient was found to be 12 wk pregnant and was referred to our institution for further diagnostics and *** admission,a soft,palpable,and tender mass in the left upper abdomen was *** was determined via MRI(with no intravenous contrast in view of the first-trimester pregnancy)to be a large collection of fluid(19 cm×17 cm×10 cm)located close to the liver hilum and below the left liver *** patient did not undergo any diagnostic or therapeutic procedures nor did they have any abdominal trauma in the preceding *** fluid collection proved to be of biliary origin following percutaneous ***,we concluded this was a spontaneous rupture of an MCN-L with the formation of a *** MRI study also revealed the previously found cystic tumour of the liver hilum communicating with the left hepatic duct,which,together with left hepatic duct dilatation,suggested the diagnosis of *** follow-up MRI with intravenous gadolinium contrast performed in the second trimester of pregnancy(week 14)showed,in turn,some features of MCN-L,including enhancement of the internal septations within the cystic liver mass.A precise preoperative differential diagnos

关键词： Biliary tract neoplasms Liver neoplasms Hepatectomy Anastomosis,Rouxen-Y Pregnancy Case report

Immunomodulatory biomaterial-based wound dressings advance the healing of chronic wounds via regulating macrophage behavior

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Regenerative Biomaterials 2022年第1期9卷 1131-1142页

作者： Ana Beatriz Sousa artur P.Águas Mário A.Barbosa Judite N.Barbosa i3S—Instituto de Inovaçäo e Investigaçäo em Saúde Universidade do PortoRua Alfredo Allen2084200-125 PortoPortugal INEB—Instituto de Engenharia Biomédica Rua Alfredo Allen2084200-125 PortoPortugal ICBAS—Instituto de Ciências Biomédicas Abel Salazar Universidade do PortoRua de Jorge Viterbo Ferreira2284050-313 PortoPortugal UMIB—Unit for Multidisciplinary Biomedical Research of ICBAS—Instituto de Ciências Biomédicas de Abel Salazar Universidade do PortoRua de Jorge Viterbo Ferreira2284050-313 PortoPortugal

Successful wound healing is a process that has three overlying phases:inflammatory,proliferative and *** wounds are characterized by a perpetuated inflammation that inhibits the proliferative and remodeling phases and impairs the wound *** are key modulators of the wound healing ***,they are responsible for the wound cleaning and for the phagocytosis of pathogens and afterwards they lead to the resolution of the inflammatory response and they express growth factors important for angiogenesis and cytokines and growth factors needed for cell proliferation and deposition of extracellular *** phenotype of the macrophage changes gradually throughout the healing process from the initial M1 pro-inflammatory phenotype characteristic of the acute response to the M2 pro-regenerative phenotype that allows an accurate tissue *** chronic wounds,M1 pro-inflammatory macrophages persist and impair tissue *** such,immunomodulatory biomaterials arise as promising solutions to accelerate the wound healing *** this review,we discuss the importance of macrophages and their polarization throughout the different phases of wound healing;macrophage dysfunction in chronic wounds and the use of immunomodulatory biomaterials to overcome the critical problem of chronic wounds-the continued inflammatory phase that impairs healing.

关键词： wound healing chronic wounds macrophage immunomodulatory biomaterials

Studies on thermal decomposition of phenol binder using TG/DTG/DTA and FTIR-DRIFTS techniques in temperature range 20-500 °C

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Foundry 2018年第2期15卷 145-151页

作者： artur Bobrowski Dariusz Drozynski Beata Grabowska Karolina Kaczmarska Zaneta Kurleto–Koziol Marcin Brzezinski AGH University of Science and Technology Faculty of Foundry EngineeringKrakowpoland

This paper presents results of thermoanalytical and structural research on phenolic binder used in foundry for the preparation of moulding sand. The binder has been prepared based on resole type phenolic resin with the addition of ester hardener. The aim of the study was to determine the structural changes taking place in the phenolic binder under the influence of temperature. Results show that in the investigated range of temperatures, phenolic binder exhibits three exothermic thermal effects accompanying the decomposition process. The test results using the Diffuse Reflectance Infrared Fourier Transform Spectroscopy(DRIFTS) technique show that the addition of a hardener stabilizes the binder structure within methylene bridges. The reduction in the reaction rate observed in the DTA curve at about 330 °C can be associated with the formation of gaseous products by decomposition of the binder or, as suggested by the literature data, the formation of triple bonds and CN-HCN groups.

关键词： phenolic resin thermal decomposition IR spectroscopy thermal analysis DRIFTS

Oleogels for development of health-promoting food products

在线全文

学校读者我要写书评

暂无评论

Food Science and Human Wellness 2020年第1期9卷 31-39页

作者： artur J.Martins Antonio A.Vicente Lorenzo M.Pastrana Miguel A.Cerqueira International Iberian Nanotechnology Laboratory Av.Mestre JoséVeiga s/n4715-330BragaPortugal Centre of Biological Engineering University of MinhoCampus de Gualtar4710-057BragaPortugal

Metabolic health and the maintenance of good levels of triglycerides,high-density lipoprotein cholesterol,blood pressure and glucose levels are concerns that can greatly impact human quality of *** consumers’demands,together with technological innovations,have led to a diversification of the food *** fostering of off-the-shelf available and affordable healthy food products is necessary,as detrimental effects on human health from the ingestion of saturated fat sources urge the efforts to find *** can be tailored using specific triglycerides and oleogelators,that can be selected to yield targeted fatty acids,reduce higher levels of cholesterol with competing binding-molecules(***),reduce saturated fat content,lessen appetite(*** the shape of foods)or carry exclusive bioactive compounds to be absorbed in the digestive *** are foreseen as an important technological advance in food science due to their versatility,easy processing and *** review explored the strategies in place to develop and produce oleogels,foreseeing their introduction in foods and how they might represent an important source of functionality through the use of healthy *** also explored how oleogels can act on the human overall metabolic health if they are used in human diet.

关键词： Oleogel Vagal pathway Nutrition Fatty acids Metabolism Gut-brain axis

Fluorescent probes for the detection of reactive oxygen species in human spermatozoa

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2020年第5期22卷 465-471页

作者： Sara Escada-Rebelo Francisca G Mora Ana P Sousa Teresa Almeida-Santos artur Paiva Joao Ramalho-Santos phD Programme in Experimental Biology and Biomedicine CNC-Center for Neuroscience and Cell BiologyUniversity of CoimbraCoimbra 3004-504Portugal Biology of Reproduction and Stem Cell Group CNC-Center for Neuroscience and Cell BiologyUniversity of CoimbraCoimbra 3004-504Portugal IIIUC-Institute for Interdisciplinary Research Casa Costa AlemaoUniversity of CoimbraCoimbra 3030-789Portugal Reproductive Medicine Unit University Hospitals of CoimbraCoimbra 3004-561Portugal Faculty of Medicine University of CoimbraCoimbra 3000-370Portugal Clinical Pathology Unit University Hospitals of CoimbraCoimbra 3004-561Portugal Department of Life Sciences University of CoimbraCoimbra 3000-456Portugal

Reactive oxygen species(ROS)production is a by-product of mitochondrial activity and is necessary for the acquisition of the capacitated state,a requirement for functional ***,an increase in oxidative stress,due to an abnormal production of ROS,has been shown to be related to loss of sperm function,highlighting the importance of an accurate detection of sperm ROS,given the specific nature of this *** this work,we tested a variety of commercially available fluorescent probes to detect ROS and reactive nitrogen species(RNS)in human sperm,to define their *** both flow cytometry(FC)and fluorescence microscopy(FM),we confirmed that MitoSOX™Red and dihydroethidium(DHE)detect superoxide anion(as determined using antimycin A as a positive control),while DAF-2A detects reactive nitrogen species(namely,nitric oxide).For the first time,we also report that RedoxSensor™Red CC-1,CellROX®Orange Reagent,and MitoPYl seem to be mostly sensitive to hydrogen peroxide,but not ***,mean fluorescence intensity(and not percentage of labeled cells)is the main parameter that can be reproducibly monitored using this type of methodology.

关键词： flow cytometry fluorescent probes human spermatozoa oxidative stress reactive oxygen species

Paracentesis following intravitreal drug injections in maintaining physiologic ocular perfusion pressure

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 Ophthalmology(English edition) 2017年第12期10卷 1925-1927页

作者： Austin Bach artur Filipowic Aaron S. Gold Azeema Latiff Timothy G. Murray Bascom Palmer Eye Institute University of MiamiMiamiFL 33136USA Des Moines University College of Osteopathic Medicine Des MoinesIA 50312USA Murray Ocular Oncology&Retina MiamiFL 33143USA

A retrospective analysis was performed of patients who received a paracentesis immediately following an intravitreal injection of bevacizumab or triamcinolone *** patients were previously diagnosed as having glaucoma,ocular hypertension,or had responded previously with sustained elevated intraocular *** 1661 procedures were *** 219（13%） of the injections were on phakic patients.A median（SD） of 210 μL（40 μL） of aqueous was removed during each *** were no reported incidences of any *** propose performing a paracentesis immediately following intravitreal injections for patients at risk for ocular hypertension,glaucoma,and retinal vein or artery occlusion.

关键词： anterior chamber paracentesis intravitreal injection intraocular pressure ocular perfusion pressure