检索结果-南通市图书馆

Endoscopic treatment of Barrett's esophagus:From metaplasia to intramucosal carcinoma

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2010年第30期16卷 3780-3785页

作者： jennifer Chennat Irving Waxman Center for Endoscopic Research and Therapeutics Section of GastroenterologyDepartment of MedicineUniversity of Chicago Pritzker School of MedicineChicagoIL 60637United States

The annual incidence of adenocarcinoma arising from Barrett’s esophagus (BE) is approximately 0.5%. Through a process of gradual transformation from lowgrade dysplasia to high-grade dysplasia (HGD), adenocarcinoma can develop in the setting of BE. The clinical importance of appropriate identifi cation and treatment of BE in its various stages, from intestinal metaplasia to intramucosal carcinoma (IMC) hinges on the dramatically different prognostic status between early neoplasia and more advanced stages. Once a patient has symptoms of adenocarcinoma, there is usually locally advanced disease with an approximate 5-year survival rate of about 20%. Esophagectomy has been the gold standard treatment for BE with HGD, due to the suspected risk of harboring occult invasive carcinoma, which was traditionally estimated to be as high as 40%. In recent years, the paradigm of BE early neoplasia management has recently evolved, and endoscopic therapies (endoscopic mucosal resection, radiofrequency ablation, and cryotherapy) have entered the clinical forefront as acceptable non-surgical alternatives for HGD and IMC. The goal of endoscopic therapy for HGD or IMC is to ablateall BE epithelium (both dysplastic and non-dysplastic) due to risk of synchronous/metachronous lesion development in the remaining BE segment.

关键词： Barrett’s esophagus High-grade dysplasia Intramucosal carcinoma Esophagectomy Endoscopic mucosal resection Radiofrequency ablation Cryotherapy

A defect in the PINOID serine/threonine kinase affects leaf shape in cucumber

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 Integrative Plant Biology 2019年第9期61卷 966-967页

作者： jennifer Mach Peridot Scientific Communications

Examining the plants in any forest or meadow reveals a remarkable diversity of leaf shape,suggesting the importance of this trait for adaptation to various environmental conditions(reviewed in Nicotra et al.2011).Indeed,leaf shape may be constrained by biomechanical factors and affects thermoregulation,susceptibility to herbivory,the available light for photosynthesis,and water balance.

关键词： the PINOID serine/threonine kinase leaf shape in cucumber Examining

Parental perceptions of the effects of exercise on behavior in children and adolescents with ADHD

在线全文

学校读者我要写书评

暂无评论

Journal of Sport and Health Science 2014年第4期3卷 320-325页

作者： jennifer I.Gapin jennifer L.Etnier Department of Kinesiology and Health Education Southern Illinois University at EdwardsvilleEdwardsvilleIL 62026USA Department of Kinesiology University of North Carolina at GreensboroGreensboro.NC 27412.USA

Background： Anecdotally, parents often report that children with attention deficit hyperactivity disorder （ADHD） who engage in regular physical activity （PA） experience positive behavioral changes. The purpose of this study was to examine this anecdotal relationship to provide preliminary evidence relevant to the potential benefits of PA on ADHD symptoms. Methods： Parents （n = 68） of children diagnosed with ADHD completed an lnternet survey assessing perceptions of how PA influences their child＇s symptoms. Results： A significantly greater percentage of parents reported that regular PA positively impacted symptoms. However, there were no uniform effects for all types of ADHD symptoms. The results indicate that there may be more positive benefits for symptoms of inattention and hyperactivity than for those of impulsivity. Conclusion： This is the first study to empirically document parents＇ perceptions of how PA influences ADHD and suggests that PA can be a viable strategy for reducing symptoms. PA may have greater benefits for specific symptoms of ADHD, providing critical information for developing PA interventions for children and adolescents.

关键词： Attention deficit Behavior Pediatrics Physical activity

Evaluation of the plasmonic effect of Au and Ag on Ti-based photocatalysts in the reduction of CO2 to CH4

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2017年第2期26卷 277-283页

作者： Martin Dilla Anna Pougin jennifer Strunk Max-Planck-Institute for Chemical Energy conversion Stiftstraße 34-3645470 Mülheim/RuhrGermany Laboratory of Industrial Chemistry Ruhr-University BochumUniversitätsstraße 15044780 BochumGermany Center for Nanointegration Duisburg-Essen University of Duisburg-EssenCarl-Benz-Straße 19947057 DuisburgGermany

Crystalline TiO（P25） and isolated titanate species in a ZSM-5 structure（TS-1） were modified with Au and Ag, respectively, and tested in the gas-phase photocatalytic COreduction under high purity conditions. The noble metal modification was performed by photodeposition. Light absorbance properties of the catalysts are examined with UV–Vis spectroscopy before and after the activity test. In the gas-phase photocatalytic COreduction, it was observed that the catalysts with Ag nanostructures are more active than those with Au nanostructures. It is thus found that the energetic difference between the band gap energy of the semiconductor and the position of the plasmon is influencing the photocatalytic ***, plasmon excitation due to visible light absorption results in plasmon resonance energy, which affects the excitation of the semiconductor positively. Therefore, an overlap between band gap energy of the semiconductor and metal plasmon is needed.

关键词： Photocatalytic CO2 reduction Plasmon resonance Methane formation TS-1 P25 Noble metal photodeposition High-purity gas-phase photoreactor

The effect of gas phase polydimethylsiloxane surface treatment of metallic aluminum particles： Surface characterization and flow behavior

在线全文

学校读者我要写书评

暂无评论

Particuology 2017年第1期15卷 92-101页

作者： Bellamarie Ludwia jennifer L. Gray Applied Research Laboratory The Pennsylvania State University North Atherton Street State College PA 16801 USA Materials Research Institute The Pennsylvania State University USA

Aluminum particles were exposed to gaseous polydimethylsiloxane （PDMS） to produce a hydropho- bic surface coating for enhanced flow and fluidity. Surface retention of the intact PDMS was confirmed through infrared and X-ray photoelectron spectroscopy. Transmission electron microscopy was used to image cross-sections of the treated particles and energy dispersive spectroscopy element maps demon- strated the presence of a surface layer consisting of silicon and oxygen. Density measurements provided evidence for improvements in the Hausner ratio and Carr index of the PDMS-treated aluminum, indicating a reduction in inter-particulate cohesion through increased bulk density. Stability, compressibility, shear, aeration, and permeability of the particles were assessed by powder rheometer. The compressibility was reduced by approximately 32% following surface treatment, revealing a reduction in void space, while Mohr＇s circle analysis and shear testing determined that the extrapolated cohesion value was reduced by approximately 53% and the flow factor at 6 kPa was doubled. Aeration testing showed that the air velocity required to obtain a fluidized bed was on the order of 0.35 mm/s for the treated powder, whereas the raw powder could not be uniformly fluidized. PDMS may be a viable option for the large-scale treatment of aluminum powder for flow applications.

关键词： Aluminum powder Polydimethylsiloxane X-ray photoelectron spectroscopy Diffuse reflectance infrared Fourier transform spectroscopy Flowability FT4 powder rheometer

To name or not to name？ An overview of the social and ethical issues raised by removing anonymity from sperm donors

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2010年第6期12卷 801-806页

作者： jennifer A. Burr University of Sheffield School of Health and Related Research SheffieM SA 1 4DA UK

The aim of this paper is to focus on the ethical issues raised by the removal of anonymity from sperm donors. The increasing currency of a ＇right to genetic truth＇ is clearly visible in the drive to revise the legislation on donor anonymity in Western and European countries. The ethical debate is polarized between the ＇right to privacy＇ of the donor or parent and the ＇right to know＇ of the prospective child. However, it is evident that religious, social and cultural attitudes have an overarching impact on attitudes towards sperm donation generally and anonymity specifically. In Asian countries, the social and cultural heritage is hugely diverse and different from those of the West. This review considers the research exploring the complexity of ethical issues informing this debate, and argues that parent＇s decisions to reveal donor insemination origins to their children are highly complex and relate to a range of social and cultural attitudes that have not been addressed within the policy to remove anonymity from sperm donors.

关键词： anonymity ethics disclosure genetic origins secrecy sperm donation

Adsorption kinetics of the herbicide safeners,benoxacor and furilazole,to activated carbon and agricultural soils

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 Environmental Sciences 2020年第3期32卷 23-34页

作者： Saraswati Poudel Acharya Jacob Johnson jennifer Weidhaas Civil and Environmental Engineering University of UtahSalt Lake CityUTUSA Center for Science and Mathematics Education University of Utah155 South 1452 EastSalt Lake CityUT 84112USA

Chloroacetamide herbicides,namely acetochlor and metolachlor,are common herbicides used on corn and soybean *** safeners,namely benoxacor and furilazole,are commonly used in formulations containing chloroacetamide *** reports on adsorption of chloroacetamide herbicides are available,yet little information exists regarding adsorption potential of co-applied ***,the adsorption and desorption characteristics of selected herbicide safeners to granular activated carbon(GAC) and in agricultural soils are ***,soil column studies were performed to understand the leaching behaviour of the herbicide Dual II *** sorption experiments of safeners to three agricultural soils and one GAC showed that adsorption was best fitted by the Freundlich *** Freundlich adsorption constant,Kf,for benoxacor and furilazole sorption onto three agricultural soils ranged from0.1 to 0.27 and 0.1 to 0.13(mg/g) x(mg/L)(1/n),*** Kf for benoxacor and furilazole to GAC was 6.4 and 3.4(mg/g) x(mg/L)(1/n),respectively,suggesting more favorable sorption of benoxacor to GAC than furilazole to *** sorption to soils was reversible as almost 40%-90% of both safeners was desorbed from three *** results were validated in four replicated soil column studies,where S-metolachlor was shown to leach similarly to the safener benoxacor,originating from the herbicide *** leaching of S-metolachlor and benoxacor was influenced by soil ***,these results show that safeners will move through the environment to surface waters similarly to the active ingredients in herbicides,but may be removed during drinking water treatment via GAC.

关键词： Herbicide safener Dual Ⅱ magnum Adsorption Granular activated carbon Soil column transport

Single-step chemistry model and transport coefficient model for hydrogen combustion

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2012年第8期55卷 2163-2168页

作者： WEN jennifer WANG ChangJian LU ShouXiang GUO Jin Center for Fire and Explosion Studies Kingston UniversityLondon SW15 3DWUK State Key Laboratory of Fire Science University of Science and Technology of China Hefei 230027 China

To satisfy the needs of large-scale hydrogen combustion and explosion simulation,a method is presented to establish single-step chemistry model and transport model for fuel-air *** the reaction formula for hydrogen-air mixture is H2+0.5O2→H2O,the reaction rate model is ?? =1.13×10?5[H2][O2]exp(?46.37T0/T) mol(cm3 s)?1,and the transport coefficient model is ?=K/CP=ρD=7.0×10?5T 0.7 g(cm s)?*** using current models and the reference model to simulate steady Zeldovich-von Neumann-Doering(ZND) wave and free-propagating laminar flame,it is found that the results are well ***,deflagration-to-detonation transition in an obstructed channel was also *** numerical results are also well consistent with the experimental *** provide a reasonable proof for current method and new models.

关键词： hydrogen combustion singe-step chemistry model transport coefficient model

同方期刊数据库

Data-driven analysis of process,structure,and properties of additively manufactured Inconel 718 thin walls

在线全文

学校读者我要写书评

暂无评论

npj Computational Materials 2022年第1期8卷 1168-1182页

作者： Lichao Fang Lin Cheng jennifer A.Glerum jennifer Bennett Jian Cao Gregory J.Wagner Department of Mechanical Engineering Northwestern UniversityEvanstonIL60208USA Department of Materials Science and Engineering Northwestern UniversityEvanstonIL60208USA DMG MORI Hoffman EstatesIL60192USA Department of Mechanical and Materials Engineering Worcester Polytechnic InstituteWorcesterMA01609USA Department of Civil and Mechanical Engineering US Military Acadeemy at West PointWest PointNY10996USA

In additive manufacturing of metal parts,the ability to accurately predict the extremely variable temperature field in detail,and relate it quantitatively to structure and properties,is a key step in predicting part performance and optimizing process *** this work,a finite element simulation of the directed energy deposition(DED)process is used to predict the space-and time-dependent temperature field during the multi-layer build process for Inconel 718 *** thermal model results show good agreement with dynamic infrared images captured in situ during the DED *** relationship between predicted cooling rate,microstructural features,and mechanical properties is examined,and cooling rate alone is found to be insufficient in giving quantitative property *** machine learning offers an efficient way to identify important features from series data,we apply a 1D convolutional neural network data-driven framework to automatically extract the dominant predictive features from simulated temperature *** good predictions of material properties,especially ultimate tensile strength,are obtained using simulated thermal history *** further interpret the convolutional neural network predictions,we visualize the extracted features produced on each convolutional layer and compare the convolutional neural network detected features of thermal histories for high and low ultimate tensile strength cases.A key result is the determination that thermal histories in both high and moderate temperature regimes affect material properties.

关键词： Inconel process additive