检索结果-南通市图书馆

Comparison of Setting Behaviour and Mechanical Properties of Various Silica-bonded No-cement Castables

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

China's Refractories 2017年第1期26卷 8-12页

作者： Hong PENG BjФrn MYHRE Elkem Silicon Materials Kristiansand NO-4621 Norway

Microsilica-gel bonded bauxite based no-cement refractory castables（NCCs）have been produced using two readily available *** NCCs were compared to NCC with Siox X-Zero,a purposely-developed product for microsilica-gel bonded no-cement castable systems to control flow properties and setting *** mixing and curing temperatures were applied：5℃,20℃and 35℃.The results show that setting-behaviour and mechanical properties strongly vary with the type of dispersant and the curing ***,both setting and strength are less temperature dependent in the castables with Siox ***,the drying and firing of microsilica-gel bonded NCCs were *** microsilica-gel bond system contains only a small amount of bound water,the castables can be fired at very high heating rates,once the free water has been removed.

关键词： dispersants setting curing temperature no-cement castable (NCCs) microsilica-gel bond fastdrying

维普期刊数据库

The German Transplant Certification

在线全文

学校读者我要写书评

暂无评论

Hepatobiliary Surgery and Nutrition 2024年第2期13卷 382-386页

作者： Björn Nashan Utz Settmacher Martina Koch The Transplantation Center First Affiliated HospitalSchool of Life Sciences and Medical CenterUniversity of Sciences&Technology of ChinaHefeiChina Department of General Visceral and Vascular SurgeryJena University HospitalJenaGermany General Visceraland Transplantation SurgeryUniversity Medical CenterMainzGermany

Since the inception of solid organ transplantation through the 50s and 60s of the 20th century,transplantation has evolved into a major driver not only in the field of surgery,but immunology,pharmacology,pathology,internal medicine,providing new techniques and concepts to provide services for patients,that had been doomed to succumb to their acute or chronic *** surgeons not only developed surgical techniques but were drivers in the development of immunosuppression as well as the inclusion of other specialties into multidisciplinary teams.

关键词： Education in transplantation board certification interdisciplinary curriculum German Transplant Certification

An Algorithm for the Stochastic Simulation of Gene Expression and Heterogeneous Population Dynamics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Computational Physics 2011年第1期9卷 89-112页

作者： Daniel A.Charlebois Jukka Intosalmi Dawn Fraser Mads Kærn Department of Physics University of Ottawa150 Louis PasteurOttawaOntarioK1N 6N5Canada Ottawa Institute of Systems Biology University of Ottawa451 Symth RoadOttawaOntarioK1H 8M5Canada Department of Mathematics Tampere University of TechnologyP.O.Box 55333101 TampereFinland Department of Signal Processing Tampere University of TechnologyP.O.Box 55333101 TampereFinland Department of Cellular and Molecular Medicine University of Ottawa451 Symth RoadOttawaOntarioK1H 8M5Canada.

We present an algorithm for the stochastic simulation of gene expression and heterogeneous population *** algorithm combines an exact method to simulate molecular-level fluctuations in single cells and a constant-number Monte Carlo method to simulate time-dependent statistical characteristics of growing cell *** benchmark performance,we compare simulation results with steadystate and time-dependent analytical solutions for several scenarios,including steadystate and time-dependent gene expression,and the effects on population heterogeneity of cell growth,division,and DNA *** comparison demonstrates that the algorithm provides an efficient and accurate approach to simulate how complex biological features influence gene *** also use the algorithm to model gene expression dynamics within"bet-hedging"cell populations during their adaption to environmental *** simulations indicate that the algorithm provides a framework suitable for simulating and analyzing realistic models of heterogeneous population dynamics combining molecular-level stochastic reaction kinetics,relevant physiological details and phenotypic variability.

关键词： Constant-number Monte Carlo stochastic simulation algorithm gene expression heterogeneous population dynamics

Toward implantable devices for angle-sensitive,lens-less,multifluorescent,single-photon lifetime imaging in the brain using Fabry-Perot and absorptive color filters

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2022年第2期11卷 197-211页

作者： Adriaan J.Taal Changhyuk Lee Jaebin Choi Björn Hellenkamp Kenneth L.Shepard Columbia University-Department of Electrical Engineering 500W.120th St.Mudd 1310New York 10027 NYUSA Korea Institute of Science and Technology-Brain Science Institute 5 Hwarang-ro 14-gilSeongbuk-guSeoul 02792Republic of Korea

Implantable image sensors have the potential to revolutionize *** to their small form factor requirements;however,conventional filters and optics cannot be *** limitations obstruct highresolution imaging of large neural *** advances in angle-sensitive image sensors and single-photon avalanche diodes have provided a path toward ultrathin lens-less fluorescence imaging,enabling plenoptic sensing by extending sensing capabilities to include photon arrival time and incident angle,thereby providing the opportunity for separability of fluorescence point sources within the context of light-field microscopy(LFM).However,the addition of spectral sensitivity to angle-sensitive LFM reduces imager resolution because each wavelength requires a separate pixel ***,we present a 1024-pixel,50μm thick implantable shank-based neural imager with color-filtergrating-based angle-sensitive *** angular-spectral sensitive front end combines a metal–insulator–metal(MIM)Fabry–Perot color filter and diffractive optics to produce the measurement of orthogonal light-field information from two distinct colors within a single *** result is the ability to add independent color sensing to LFM while doubling the effective pixel *** implantable imager combines angular-spectral and temporal information to demix and localize multispectral fluorescent *** this initial prototype,this is demonstrated with 45μm diameter fluorescently labeled beads in scattering *** lifetime imaging is exploited to further aid source separation,in addition to detecting pH through lifetime changes in fluorescent *** these initial fluorescent targets are considerably brighter than fluorescently labeled neurons,further improvements will allow the application of these techniques to in-vivo multifluorescent structural and functional neural imaging.

关键词： filters lifetime angle

Chicory(Cichorium intybus L.) and cereals differently affect gut development in broiler chickens and young pigs

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 Animal Science and Biotechnology 2014年第2期5卷 230-235页

作者： Haoyu Liu Emma Ivarsson Torbjrn Lundh Jan Erik Lindberg Department of Animal Nutrition and Management Swedish University of Agricultural SciencesP.O.Box 7024Uppsala SE-750 07Sweden

Dietary fiber, resistant to host-mediated digestion in the small intestine due to lack of endogenous enzymes, impacts many facets of animal health and is associated with gut development especially in young monogastrics. Furthermore, it can be used as in-feed antibiotic alternative. Chicory （Cichorium intybus L.） forage with high content of pectin （uronic acids as building blocks） is a novel class of dietary fiber that is chemically different from cereal grains （with high content of arabinoxylans）. In the present study, we investigated effects of dietary inclusion of chicory forage on digestibility, gut morphology and microbiota in broilers and young pigs. In the chicken experiment, 160 1-d old broiler chicks were fed 3 nutritionally balanced diets for 30 d including a cereal-based diet and 2 diets with part of the cereals substituted with 60 and 120 g/k9 chicory forage （CF60 and CF120], whereas in the pig experiment, 18 seven-wk old Yorkshire pigs were fed 3 diets for 18 d including a cereal-based diet and 2 diets with 80 and 160 g/kg chicory forage inclusion （CF80 and CF160）. Our results showed that young pigs were capable to utilize chicory forage well with higher total tract apparent digestibility （TTAD） of all fiber fractions, particularly uronic acid, compared with the control （P 〈 0.01）. In contrast, a decreased TTAD of all fiber fractions was observed in chickens fed on diet CF120 （P 〈 0.05）. Moreover, diet induced changes in gut morphology were observed in the large intestine of chickens. The alteration of cecal mucosal thickness was further positively correlated with TTAD of non-starch polysaccharides （NSP） and its constituent sugars （P 〈 0.05）. In addition, in pigs, terminal restriction fragment length polymorphism （T-RFLP） analysis of intestinal microbiota revealed substantial dietary effects （cereal control diet vs. chicory forage inclusion） on the relative abundance of 2 dominant bacterial phylotypes （Prevotella sp. vs. Roseburia sp.） respectively （P 〈

关键词： Broiler Cereal arabinoxylans Chicory uronic acids Digestibility Gut development Microbiota Pectin Young pigs

维普期刊数据库

Transition Operator Approach to Seismic Full-Waveform Inversion in Arbitrary Anisotropic Elastic Media

在线全文

学校读者我要写书评

暂无评论

Communications in Computational Physics 2020年第6期28卷 297-327页

作者： Morten Jakobsen Ivan Psencık Einar Iversen Bjørn Ursin Department of Earth Science University of BergenNorway Institute of Geophysics Czech Academy of SciencesCzech Republic Department of Geoscience and Petroleum NTNU and F.University of BahiaBrazil

We generalize the existing distorted Born iterative T-matrix(DBIT)method to seismic full-waveform inversion(FWI)based on the scalar wave equation,so that it can be used for seismic FWI in arbitrary anisotropic elastic media with variable mass densities and elastic stiffness *** elastodynamic wave equation for an ar-bitrary anisotropic heterogeneous medium is represented by an integral equation of the Lippmann-Schwinger type,with a 9-dimensional wave state(displacement-strain)*** solve this higher-dimensional Lippmann-Schwinger equation using a transition operator formalism used in quantum scattering *** allows for domain decomposition and novel variational *** tensorial nonlinear inverse scat-tering problem is solved iteratively by using an expression for the Fŕechet derivatives of the scattered wavefield with respect to elastic stiffness tensor fields in terms of modified Green’s functions and wave state vectors that are updated after each *** the generalized DBIT method is consistent with the Gauss-Newton method,it incorporates approximate Hessian information that is essential for the reduction of multi-parameter cross-talk *** DBIT method is implemented efficiently using a variant of the Levenberg-Marquard method,with adaptive selection of the regularization parameter after each *** a series of numerical experiments based on synthetic waveform data for transversely isotropic media with vertical symmetry axes,we obtained a very good match between the true and inverted models when using the traditional Voigt *** suggests that the effects of cross-talk can be sufficiently reduced by the incorporation of Hessian information and the use of suitable regularization *** the generalized DBIT method for FWI in anisotropic elastic media is naturally target-oriented,it may be particularly suitable for applications to seismic reservoir characterization and ***,the theory a

关键词： Waveform inversion time-lapse seismic seismic inverse scattering target-oriented inversion Green’s function

Electrodeposition of Al from a 1-butylpyrrolidine-AlCl3 ionic liquid

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2015年第6期25卷 603-611页

作者： Giridhar Pulletikurthi Bj?rn B?decker Andriy Borodin Bernd Weidenfeller Frank Endres Institute of Electrochemistry Clausthal University of Technology

The addition of 1-butylpyrrolidine to AlCl3results in the formation of an electrolyte that is suited to Al *** feasibility of electrodepositing Al from the synthesized electrolyte was *** compositions of AlCl3and 1-butylpyrrolidine were prepared for this *** mixtures show a different phase behavior at various compositions of AlCl3and ***,Raman and NMR spectroscopy were employed to characterize the synthesized *** the prepared compositions,1:1.2 mol ratio of 1-butylpyrrolidine:AlCl3and the upper phase of 1:1.3 mol ratio of 1-butylpyrrolidine:AlCl3were found to be suitable for Al electrodeposition at room temperature（RT）.Uniform and thick（ mm thick） layers of Al were obtained on copper at *** deposition occured from the cationic species of AlCl3xLty（where x r 2,y ? 1–2,and L ? 1-butylpyrrolidine） in this *** behavior is contrary to the well investigated classic AlCl3based ionic liquids,where the deposition of Al occurs mainly from anionic Al2 Cl 7ions.

关键词： Aluminium Al cations 1-butylpyrrolidine Ionic liquid Electrodeposition

Experimental human pain models in gastro-esophageal reflux disease and unexplained chest pain

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2006年第18期12卷 2805-2817页

作者： Asbjφrn Mohr Drewes Lars Arendt-Nielsen Peter Funch-Jensen Hans Gregersen Center for Visceral Biomechanics and Pain Department of GastroenterologyAalborg Hospitaland Center for Sensory-Motor InteractionsDepartment of Health Science and TechnologyAalborg UniversityDenmark Department of Surgical Gastroenterology L Aarhus HospitalDenmark

Methods related to experimental human pain research aim at activating different nociceptors, evoke pain from different organs and activate specific pathways and mechanisms. The different possibilities for using mechanical, electrical, thermal and chemical methods in visceral pain research are discussed with emphasis of combinations (e.g., the multimodal approach). The methods have been used widely in assessment of pain mechanisms in the esophagus and have contributed to our understanding of the symptoms reported in these patients. Hence abnormal activation and plastic changes of central pain pathways seem to play a major role in the symptoms in some patients with gastro-esophageal reflux disease and in patients with functional chest pain of esophageal origin. These findings may lead to an alternative approach for treatment in patients that does not respond to conventional medical or surgical therapy.

关键词： Pain Gut Experimental Chest pain Esophagitis

The use of milk Fourier transform midinfrared spectra and milk yield to estimate heat production as a measure of efficiency of dairy cows

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 Animal Science and Biotechnology 2020年第3期11卷 920-928页

作者： Sadjad Danesh Mesgaran Anja Eggert Peter Höckels Michael Derno Björn Kuhla Institute of Nutritional Physiology“Oskar Kellner ”Leibniz Institute for Farm Animal Biology(FBN)Wilhelm-Stahl-Allee 218196 DummerstorfGermany Institute of Genetics and Biometry Leibniz Institute for Farm Anih8mal Biology(FBN)Wilhelm-Stahl-Allee 218196 DummerstorfGermany IfM GmbH&Co.KG-Institut für Milchuntersuchung(Milk Testing Services North Rhine-Westphalia) Bischofstraße 8547809 KrefeldGermany

Background:Transformation of feed energy ingested by ruminants into milk is accompanied by energy losses via fecal and urine excretions,fermentation gases and *** production may differ among dairy cows despite comparable milk yield and body ***,heat production can be considered an indicator of metabolic efficiency and directly measured in respiration *** latter is an accurate but time-consuming *** contrast,milk Fourier transform mid-infrared(FTIR)spectroscopy is an inexpensive high-throughput method and used to estimate different physiological traits in ***,this study aimed to develop a heat production prediction model using heat production measurements in respiration chambers,milk FTIR spectra and milk yield measurements from dairy ***:Heat production was computed based on the animal’s consumed oxygen,and produced carbon dioxide and methane in respiration *** production data included 16824-h-observations from 64 German Holstein and 20 dual-purpose Simmental *** were milked twice daily at 07:00 and 16:30 h in the respiration *** yield was determined to predict heat production using a linear *** samples were collected from each milking and FTIR spectra were obtained with MilkoScan FT *** average or milk yield-weighted average of the absorption spectra from the morning and afternoon milking were calculated to obtain a computed spectrum.A total of 288 wavenumbers per spectrum and the corresponding milk yield were used to develop the heat production model using partial least squares(PLS)***:Measured heat production of studied animals ranged between 712 and 1470 kJ/kg *** coefficient of determination for the linear regression between milk yield and heat production was 0.46,whereas it was 0.23 for the FTIR spectra-based PLS *** PLS prediction model using weighted average spectra and milk yield resulted in a cross-validation variance of 57%and a ro

关键词： Dairy cattle Heat production Milk spectra Partial least square regression Respiration chamber

维普期刊数据库