检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

多层帘式涂布和一种新型压光技术

国际造纸 2008年第5期27卷 51-55页

作者： Pentti Rautiainen Mika Viljanmaa Henri Vaittinen jouni haavisto Robert Urscheler Seppo Luomi Antti Aronen 苏艳群（译）邝仕均（校） Metso Paper Inc. Jarvenpaa Finland Dow Urope SA Horgen Switzerland M-real Inc. Simpele Finland 不详

帘式涂布是一种低冲击预计量涂布方式,可用于纸和纸板的涂布。帘式涂布技术所产生的涂层为仿形涂层,因而能提供良好的纤维覆盖。在多层帘式涂布中,可以同时进行多层涂布。与单层帘式涂布相比,多层帘式涂布具有许多优点:投资成本更低、... 详细信息

帘式涂布是一种低冲击预计量涂布方式,可用于纸和纸板的涂布。帘式涂布技术所产生的涂层为仿形涂层,因而能提供良好的纤维覆盖。在多层帘式涂布中,可以同时进行多层涂布。与单层帘式涂布相比,多层帘式涂布具有许多优点:投资成本更低、设计不同涂层性质更具灵活性、具有更大的涂布操作空间及涂层更薄等。

关键词：涂布方式多层涂布压光技术涂层性质涂布技术投资成本操作空间低冲击

Finite Degree Holomorphic Covers of Compact Riemann Surfaces

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2007年第1期23卷 89-94页

作者： jouni PARKKONEN Vesa RUUSKA Department of Mathematics and Statistics P.O.Box 35 40014 University of JyvskylFinland Department of Physics P.O.Box 3540014 University of JyvskylFinland

A conjecture of Ehrenpreis states that any two compact Riemann surfaces of genus at least two have finite degree unbranched holomorphic covers that are arbitrarily close to each other in moduli space. Here we prove a weaker result where certain branched covers associated with arithmetic Riemann surfaces are allowed, and investigate the connection of our result with the original conjecture.

关键词： Riemann surfaces covering maps quasiconformal maps

Survival of transplanted nests of the red wood ant Formica aquilonia （Hymenoptera： Formicidae）： The effects of intraspecific competition and forest clear-cutting

在线全文

学校读者我要写书评

暂无评论

Insect Science 2014年第4期21卷 486-492页

作者： jouni Sorvari Esa Huhta Harri Hakkarainen 1 Section of Ecology Department of Biology FI-20014 University of Turku Finland Department of Environmental Science University of Eastern Finland P.O. Box 1627 FI-70211 Kuopio Finland Finnish Forest Research Institute Rovaniemi Research Unit P.O. Box 16 FI-96301 Rovaniemi Finland

The fitness and survival of ant colonies depend on the resources near their nests. These resources may be limited due to poor habitat quality or by intra- and interspecific competitions, which in extreme cases may cause the ant colony to perish. We tested the effect of intraspecific competition and habitat degradation （forest clear-cutting） on colony survival by transplanting 26 nests of the red wood ant （Formica aquilonia Yarrow, 1955） in 26 different forest areas that contained 0-11 conspecific alien nests per hectare. F. aquilonia is highly dependent on canopy-dwelling aphids, thus the removal of trees should cause food limitation. During the course of the 4-year experiment, 9 of the forests were partially clear- cut. We found that while forest clear-cutting significantly decreased the colonies＇ survival, intraspecific competition did not. As a highly polygynous and polydomous species, E aquilonia seems to tolerate the presence of alien conspecific colonies to a certain extent.

关键词： colony survival habitat degradation polydomy red wood ants relocationexperiment

One Novel Hydraulic Actuating System for the Lower-Body Exoskeleton

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2021年第1期34卷 20-29页

作者： Maowen Sun Xiaoping Ouyang jouni Mattila Huayong Yang Gang Hou State Key Laboratory of Fluid Power&Mechatronic Systems Zhejiang UniversityHangzhou 310027China Department of Intelligent Hydraulics and Automation Tampere University33101 TampereFinland Guiyang HYC Hydraulic Co. LtdGuiyang 550018China

The hydraulic exoskeleton is one research hotspot in the field of robotics,which can take heavy load due to the high power density of the hydraulic ***,the traditional hydraulic system is normally centralized,inefficient,and bulky during application,which limits its development in the *** improving the robot's performance,its hydraulic actuating system should be optimized *** this paper a novel hydraulic actuating system(HAS)based on electric-hydrostatic actuator is proposed,which is applied to hip and knee *** HAS integrates an electric servo motor,a high-speed micro pump,a specific tank,and other components into a *** specific parameters are obtained through relevant simulation according to human motion data and load *** dynamic models of the HAS are built,and validated by the system *** of trajectory tracking and human-exoskeleton interaction are carried out,which demonstrate the proposed HAS has the ability to be applied to the *** with the previous prototype,the total weight of the HAS in the robot is reduced by about 40%,and the power density is increased by almost 1.6 times.

关键词： Hydraulic actuating system(HAS) Lower-body exoskeletons Lightweight and integrated System identification Working mode test

Sustainable earth observations for the Arctic,the Antarctic and the high-altitude mountain cold regions

在线全文

学校读者我要写书评

暂无评论

International Journal of Digital Earth 2019年第8期12卷 858-859页

作者： jouni Pulliainen Bin Cheng Yubao Qiu Arctic Research Center Finnish Meteorological Institute Finnish Meteorological Institute Institute of Remote Sensing and Digital Earth Chinese Academic of Science

The Arctic,the Antarctic as well as the Qinghai-Tibet Plateau(QTP)are cold regions on Earth where snow and ice dominate the local environment and impact the global climate via several strong feedback *** observations and information service for those cold regions are vital for the societal benefits,and support from the science to policy making(Qiu et al.2016).Earth cold regions exhibit strong sensitivity to global climate change and are thus some of the most fragile regions in terms of global ecology(Pulliainen et al.2017).Due to these inherent similarities,the Qinghai-Tibet Plateau area has been termed as the‘Third Pole’,which is experiencing profound environmental changes.

关键词： Arctic Antarctic Earth

Using Statistical Downscaling to Quantify the GCM-Related Uncertainty in Regional Climate Change Scenarios: A Case Study of Swedish Precipitation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2006年第1期23卷 54-60页

作者： Deliang CHEN Christine ACHBERGER jouni R■IS■NEN Cecilia HELLSTRM Earth Sciences Centre Gothenburg UniversityGothenburgSweden Laboratory for Climate Studies/National Climate CenterChina Meteorological AdministrationBeijingChina Earth Sciences Centre Gothenburg UniversityGothenburgSweden Department of Atmospheric Sciences University of HelsinkiFinland

There are a number of sources of uncertainty in regional climate change scenarios. When statistical downscaling is used to obtain regional climate change scenarios, the uncertainty may originate from the uncertainties in the global climate models used, the skill of the statistical model, and the forcing scenarios applied to the global climate model. The uncertainty associated with global climate models can be evaluated by examining the differences in the predictors and in the downscaled climate change scenarios based on a set of different global climate models. When standardized global climate model simulations such as the second phase of the Coupled Model Intercomparison Project （CMIP2） are used, the difference in the downscaled variables mainly reflects differences in the climate models and the natural variability in the simulated climates. It is proposed that the spread of the estimates can be taken as a measure of the uncertainty associated with global climate models. The proposed method is applied to the estimation of global-climate-model-related uncertainty in regional precipitation change scenarios in Sweden. Results from statistical downscaling based on 17 global climate models show that there is an overall increase in annual precipitation all over Sweden although a considerable spread of the changes in the precipitation exists. The general increase can be attributed to the increased large-scale precipitation and the enhanced westerly wind. The estimated uncertainty is nearly independent of region. However, there is a seasonal dependence. The estimates for winter show the highest level of confidence, while the estimates for summer show the least.

关键词： Statistical downscaling global climate model climate change scenario uncertainty

Annual performance analysis of different maximum power point tracking techniques used in photovoltaic systems

在线全文

学校读者我要写书评

暂无评论

Protection and Control of Modern Power Systems 2019年第1期4卷 183-192页

作者： Y.Chaibi A.Allouhi M.Salhi A.El-jouni 2EMI team ENSAMMoulay Ismail University50500B.P 15290 El MansourMeknesMorocco Ecole Supérieure de Technologie de Fès U.S.M.B.ARoute d’ImouzzerBP 2427FezMorocco Physics Department of the CRMEF TangierMorocco

This paper presents an annual performance evaluation of three maximum power point tracking (MPPT) methods. The used MPPT techniques (Perturb and Observe, Incremental Inductance and Sliding mode) are evaluated under an annual data of atmospheric conditions of the target site. The main contribution of this work is to consider real fluctuation conditions of solar irradiations, ambient temperatures and wind velocities. It was found that the Sliding mode provides higher energy yields independently of the period. Compared to the basic P&O and the IC techniques, sliding mode has the potential of generating up to 8.18% more electrical energy than other techniques.

关键词： Photovoltaic systems Maximum power point tracking(MPPT) Annual performance

Efficient Management of Fines in the Stock Flow prior to Headbox in Paper,Board,and Tissue Production

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Paper And Biomaterials 2022年第1期7卷 45-54页

作者： jouni Matula Jussi Matula Jukka Nokelainen Tommi Niskanen Lasse Kauppinen Eemeli Siitonen Wetend Technologies Ltd. KaartilantieSavonlinnaFI-57230Finland Valmet Automation Inc. Kehräämöntie PO Box177 KajaaniFI-87101Finland 3.Fincet Ltd.Kehräämöntie 7KajaaniFI-87101Finland Solenis Inc. Kolmihaarankatu 7TampereFI-33330Finland

Fines represent a significant volume of biobased wood material and filler,which is of significant importance to sheet *** imaging technology reveals the true nature of the behavior of fines in the retention *** study illustrates new chemical mixing systems,novel and efficient flash mixing methods,and active measurement and automation systems pertaining to efficient management of fines in the stock flow prior to headbox in paper,board,and tissue production,which can reduce additive,fresh water,energy consumption,and the carbon footprint of production to improve sustainability and provide novel opportunities for fines and filler management.

关键词： paper board fines and fillers headbox flash mixing stock camera image technology

Neonatal Fc receptor-targeted lignin-encapsulated porous silicon nanoparticles for enhanced cellular interactions and insulin permeation across the intestinal epithelium

在线全文

学校读者我要写书评

暂无评论

Bioactive Materials 2022年第3期7卷 299-315页

作者： Joao P.Martins Patrícia Figueiredo Shiqi Wang Erika Espo Elena Celi Beatriz Martins Marianna Kemell Karina Moslova Ermei Makil Jarno Salonen Mauri A.Kostiainen Christian Celia Vincenzo Cerullo Tapani Viitala Bruno Sarmento jouni Hirvonen Helder A.Santos Drug Research Program Division of Pharmaceutical Chemistry and TechnologyFaculty of PharmacyUniversity of HelsinkiFI-00014HelsinkiFinland Department of Pharmacy University of Chieti-Pescara“G d’Annunzio”I-66100ChietiItaly Drug Research Program Division of Pharmaceutical BiosciencesFaculty of PharmacyUniversity of HelsinkiFI-00014HelsinkiFinland Department of Chemistry University of HelsinkiFI-00014HelsinkiFinland Department of Physics and Astronomy University of TurkuFI-20014TurkuFinland Biohybrid Materials Department of Bioproducts and BiosystemsAalto UniversityFI-00076AaltoFinland i3S-Instituto de Investigaçao e Inovaçao em Saúde University of Porto4200-135PortoPortugal INEB-Instituto de Engenharia Biomedica University of Porto4200-135PortoPortugal CESPU-Instituto de Investigaçao e Formaçao Avançada em Ciencias e Tecnologias da Saúde 4585-116GandraPortugal Helsinki Institute of Life Science(HiLIFE) University of HelsinkiFI-00014HelsinkiFinland

Oral insulin delivery could change the life of millions of diabetic patients as an effective,safe,easy-to-use,and affordable alternative to insulin injections,known by an inherently thwarted patient ***,we designed a multistage nanoparticle(NP)system capable of circumventing the biological barriers that lead to poor drug absorption and bioavailability after oral *** nanosystem consists of an insulin-loaded porous silicon NP encapsulated into a pH-responsive lignin matrix,and surface-functionalized with the Fc fragment of immunoglobulin G,which acts as a targeting ligand for the neonatal Fc receptor(FcRn).The developed NPs presented small size(211±1 nm)and narrow size *** NPs remained intact in stomach and intestinal pH conditions,releasing the drug exclusively at pH 7.4,which mimics blood *** formulation showed to be highly cytocompatible,and surface plasmon resonance studies demonstrated that FcRn-targeted NPs present higher capacity to interact and being internalized by the Caco-2 cells,which express FcRn,as demonstrated by Western ***,in vitro permeability studies showed that Fc-functionalized NPs induced an increase in the amount of insulin that permeated across a Caco-2/HT29-MTX co-culture model,showing apparent permeability coefficients(Papp)of 2.37×10􀀀6 cm/s,over the 1.66×10􀀀6 cm/s observed for their non-functionalized ***,these results demonstrate the potential of these NPs for oral delivery of anti-diabetic drugs.

关键词： Nanoparticles Porous silicon Lignin FcRn Insulin Oral drug delivery