检索结果-南通市图书馆

Carbon storage and net primary productivity in Canadian boreal mixedwood stands

Journal of Forestry Research 2019年第5期30卷 1667-1678页

作者： Nicholas J.Payne D.Allan Cameron jean-denis leblanc Ian K.Morrison Canadian Forest Service Great Lakes Forestry Centre

Canadian boreal mixedwood forests are extensive,with large potential for carbon sequestration and storage;thus,knowledge of their carbon stocks at different stand ages is needed to adapt forest management practices to help meet climate-change mitigation *** stocks were quantified at three Ontario boreal mixedwood sites.A harvested stand,a juvenile stand replanted with spruce seedlings and a mature stand had total carbon stocks(±SE)of 133±13 at age 2,130±13 at age 25,and 207±15 Mg C ha^-1 at age 81 *** the clear-cut site,stocks were reduced by about 40%or 90 Mg C ha^-1 at *** held 27,34 and 62%of stocks,while detritus held 34,29 and 13%of stocks at age 2,25 and 81,*** soil carbon stocks averaged 51 Mg C ha^-1,and held 38,37 and 25%of *** net primary productivity(±SE)in the harvested and juvenile stand was 2.1±0.2 and 3.7±0.3 Mg C ha^-1 per annum(p.a.),compared to 2.6±2.5 Mg C ha^-1 *** the mature *** mature canopies studied had typical boreal mixedwood composition and mean carbon densities of 208 Mg C ha^-1,which is above average for managed Canadian boreal forest ecosystems.A comparison of published results from Canadian boreal forest ecosystems showed that carbon stocks in mixedwood stands are typically higher than coniferous stands at all ages,which was also true for stocks in vegetation and ***,aboveground net primary productivity was typically found to be higher in mixedwood than in coniferous boreal forest stands over a range of *** from this study,together with those published from the other boreal forest stands demonstrate the potential for enhanced carbon sequestration through modified forest management practices to take advantage of Canadian boreal mixedwood stand characteristics.

关键词： Aboveground net primary productivity Boreal mixedwood forest Carbon stocks Mixedwood stand management Stand age

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Formation mechanisms of sub-micron pharmaceutical composite particles derived from far-and near-field Raman microscopy

引用

Journal of Pharmaceutical Analysis 2021年第4期11卷 480-489页

作者： Jakob Hübner jean-Baptiste Coty Yan Busby denis Spitzer Nanomateriaux pour Les Systemes Sous Sollicitations Extr^emes(NS3E) ISL-CNRS-UNISTRA UMR 3208French-German Research Institute of Saint-Louis5Rue Du General CassagnouB.P.7003468301Saint-LouisFrance Spinofrin SAS 20 Bis Rue Danjou92100BoulogneBillancourtFrance

Surface enhanced Raman spectroscopy(SERS) and confocal Raman microscopy are applied to investigate the structure and the molecular arrangement of sub-micron furosemide and polyvinylpyrrolidone(furosemide/PVP) particles produced by spray flash evaporation(SFE). Morphology, size and crystallinity of furosemide/PVP particles are analyzed by scanning electron microscopy(SEM) and X-ray powder diffraction(XRPD). Far-field Raman spectra and confocal far-field Raman maps of furosemide/PVP particles are interpreted based on the far-field Raman spectra of pure furosemide and PVP *** far-field Raman microscopy shows that furosemide/PVP particles feature an intermixture of furosemide and PVP molecules at the sub-micron scale. SERS and surface-enhanced confocal Raman microscopy(SECo RM) are performed on furosemide, PVP and furosemide/PVP composite particles sputtered with silver(40 nm). SERS and SECo RM maps reveal that furosemide/PVP particle surfaces mainly consist of PVP molecules. The combination of surface and bulk sensitive analyses reveal that furosemide/PVP sub-micron particles are formed by the agglomeration of primary furosemide nanocrystals embedded in a thin PVP matrix. Interestingly, both far-field Raman microscopy and SECo RM provide molecular information on a statistically-relevant amount of sub-micron particles in a single microscopic map;this combination is thus an effective and time-saving tool for investigating organic sub-micron composites.

关键词： SERS Confocal Raman microscopy Surface characterization Sub-micron particles Pharmaceutic composites

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Elderly patients with inflammatory bowel disease: Updated review of the therapeutic landscape

引用

World Journal of Gastroenterology 2019年第30期25卷 4158-4171页

作者： jean-Frédéric leblanc Daniel Wiseman Peter L Lakatos Talat Bessissow Department of Adult Gastroenterology McGill University Health CentreMontrealQC H3G 1A4Canada Department of Medicine McGill University Health CentreMontrealQC H3G 1A4Canada 1^st Department of Medicine Semmelweis UniversityBudapest 1083Hungary

High-quality data remains scarce in terms of optimal management strategies in the elderly inflammatory bowel disease(IBD)***,available trials have been mostly retrospective,of small sample size,likely owing to underrepresentation of such a population in the major randomized controlled ***,in the last five years,there has been a steady increase in the number of published trials,helping clarify the estimated benefits and toxicity of the existing IBD *** the Everhov trial,prescription strategies were recorded over an average follow-up of 4.2 years.A minority of elderly IBD patients(1%-3%)were treated with biologics within the five years following diagnosis,whilst almost a quarter of these patients were receiving corticosteroid therapy at year five of follow-up,despite its multiple *** low use of biologic agents in real-life settings likely stems from limited data suggesting lower efficacy and higher *** minireview will aim to highlight current outcome measurements as it portends the elderly IBD patient,as well as summarize the available therapeutic strategies in view of a growing body of evidence.

关键词： Inflammatory bowel disease Elderly Outcomes Glucocorticoids Biological therapy Surgery

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

How Organizational Factors Can Influence Auditors' Intention of Turnover in France?

How Organizational Factors Can Influence Auditors' Intention...

引用

作者： jean-denis Truquet 上海交通大学

学位级别：硕士

This research investigates the potential relationships between organizational factors and turnover intents in the audit sector in *** organizational factors include Stress,Perceived Organizational Support and Perceived Supervisor Support,Organizational Justice and Job *** concept of turnover intent has been steadily growing in importance across the years as the determinant factor influencing *** theories and models have been put forward for the last 50 years in order to better apprehend turnover intents,turnover and its *** the most famous ones recognized today are the March and Simon Theory of Organizational Equilibrium,the attitudinal models(Mobley,1977;Price and Mueller,1981;Porter,Steers,Mowday and Boulian 1974;Hom and Griffeth 1991),the Spill-over Models of Turnover,the Organizational Factors Model of Turnover,the Job Embeddedness Theory,and the Unfolding Model of Voluntary Turnover(Lee and Mitchel,1994).Indeed,turnover has become an increasingly significant phenomenon in today professional *** is more,the turnover issue has also been magnified by the covid 19 *** Big Quit" that has swept through the US finally reached Western *** French consulting firms like Capgemini have lost 20%of their workforce and are now scrambling to find new *** is one example among many ***-depth interviews were used to determine the organizational factors leading to turnover intents that mattered the most to *** online questionnaire was later shared with auditors working in the Big 4 in France in order to assess whether organizational factors could have a significant impact on turnover *** online questionnaire,built with SurveyMonkey,was shared with auditors through different informatic means(LinkedIn,Messenger,Whatsapp and other communication platforms)over the span of two weeks and *** total,117 respondents took part in the *** on the results that were obtained through sta

关键词： turnover,engagement,Supervisor,Justice,perceived,organizational,questionnaire,professional,likely,have,

来源：

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

Fast and accurate surface normal integration on non-rectangular domains

引用

Computational Visual Media 2017年第2期3卷 107-129页

作者： Martin Bahr Michael Breuβ Yvain Quéau Ali Sharifi Boroujerdi jean-denis Durou Brandenburg Technical University Institute for MathematicsChair for Applied Mathematics Technical University Munich Universit'e de Toulouse IRIT

The integration of surface normals for the purpose of computing the shape of a surface in 3D space is a classic problem in computer vision. However,even nowadays it is still a challenging task to devise a method that is flexible enough to work on non-trivial computational domains with high accuracy, robustness,and computational efficiency. By uniting a classic approach for surface normal integration with modern computational techniques, we construct a solver that fulfils these requirements. Building upon the Poisson integration model, we use an iterative Krylov subspace solver as a core step in tackling the task. While such a method can be very efficient, it may only show its full potential when combined with suitable numerical preconditioning and problem-specific initialisation. We perform a thorough numerical study in order to identify an appropriate preconditioner for this *** provide suitable initialisation, we compute this initial state using a recently developed fast marching integrator. Detailed numerical experiments illustrate the benefits of this novel combination. In addition, we show on real-world photometric stereo datasets that the developed numerical framework is flexible enough to tackle modern computer vision applications.

关键词： surface normal integration Poisson integration conjugate gradient method preconditioning fast marching method Krylov subspace methods photometric stereo 3D reconstruction

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Impact of homogeneous pathologic response to preoperative chemotherapy in patients with multiple colorectal liver metastases

引用

World Journal of Gastroenterology 2017年第45期23卷 8027-8034页

作者： Charles Sabbagh denis Chatelain Christophe Attencourt jean-Paul Joly Bruno Chauffert Cyril Cosse jean-Marc Regimbeau Depart-ment of Digestive and Oncologic Surgery Amiens University Medical Center INSERM U1088 Jules Verne University of Picardie University of Picardie Department of Anatomic Pathology Amiens University Medical Center Department of Hepatogastroenterology Amiens University Medical Center Department of Medical Oncology Amiens University Medical Center EA4294 Jules Verne University of Picardie

AIM To analyze the homogeneity of pathologic response to preoperative chemotherapy(PRPC) after chemotherapy in patients with multiple liver metastases(LM).METHODS From September 2011 to August 2014,patients with at least two LM undergoing preoperative chemotherapy prior to resection were included in this retrospective,single-center study. The endpoints were PRPC homogeneity(according to both the Rubbia-Brandt and MD Anderson classifications),the impact of PRPC on the MDT decision,factors associated with homogeneous PRPC and overall survival of patients with vs. without homogeneous *** seventy-three patients with a total of 88 liver resections(including 15 two-stage procedures) were included in the study. The homogeneous PRPC rate was 55% according to the Rubbia-Brandt classification and 53% according to the MD Anderson classification. The MDT decision was modified by the PRPC in only 2.7% of patients(n = 2). CONCLUSION The PRPC was homogeneous in only one half of patients and had very little influence on the MDT decision.

关键词： Liver metastases Pathological response Homogeneity Preoperative chemotherapy Colorectal cancer

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Process conditions for preparing well-defined nano- and microparticles as delivery systems of alkyl gallates

引用

Particuology 2019年第3期17卷 105-116页

作者： Asma Chebil denis Funfschilling jean-Luc Six Cécile Nouvel Alain Durand Michèle Léonard Universite de Lorraine CNRS LCPM F-54000 Nancy France Universite de Lorraine CNRS LRGP F-54000 Nancy France Universite de Strasbourg CNRS ICube F-67000 Strasbourg France

Dextran-covered poly(D,L-lactide) (PLA) nano-and microparticles were prepared using an emulsion/solvent evaporation (or diffusion) process for the encapsulation of alkyl gallates (AGs).In the first step,a solution of PLA and AG in ethyl acetate was emulsified to give an aqueous phase containing a hydrophobically modified dextran,which acted as a *** second step involved solvent evaporation or *** emulsification conditions were varied,which allowed for the preparation of nanoand microparticle suspensions covering a wide range of surface-average particle diameters from 0.1 μm (sonication) to 500 μm (stirring with a magnetic bar),with narrow and reproducible size *** microfluidic emulsification in a flow-focusing system led to well-defined microparticles,in the 10-50 μm *** loaded with octyl gallate (OG) and nonyl gallate (NG) were obtained using the three processes,and we showed that the encapsulation efficiency of OG and NG varied significantly depending on the emulsification *** effect of particle size on the mechanism of in vitro release of encapsulated AGs was *** kinetics of release were controlled either by Fickian diffusion within the solid core or swelling and hydrolytic degradation of the PLA matrix,depending on the pH of the external medium.

关键词： Emulsion/solvent evaporation Dextran Poly(D.L-lactide) Encapsulation Release Alkyl gallate

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Quantifying post logging biomass loss using satellite images and ground measurements in Southeast Cameroon

引用

Journal of Forestry Research 2016年第6期27卷 1415-1426页

作者： Richard Sufo Kankeu denis jean Sonwa ichard Eba’a Atyi Noelle Marlène Moankang Nkal Center for International Forestry Research (CIFOR) PO Box 2008 Messa Yaounde Cameroon University of Maine-Lemans Avenue Olivier Messiaen72085 Le Mans France FASA University of Dschang PO Box 222 DschangCameroon

Forest logging in the Congo Basin has led to forest fragmentation due to logging infrastructures and felling gaps. In the same vein, forest concessions in the Congo Basin have increasing interest in the REDD＋ mechanism. However, there is little information or field data on carbon emissions from forest degradation caused by logging. To help fill this gap, Landsat 7 and 8 and SPOT 4 images of the East Region of Cameroon were processed and combined with field measurements （measurement of forest roads widths, felling gaps and log yards） to assess all disturbed areas. Also, measurements of different types of forest infrastructures helped to highlight emission factors. Forest contributes to 5.18 % of the degradation of the annual allowable cut （AAC）（84.53 ha） corresponding to 4.09 % of forest carbon stock （6.92 t ha^-1）. Felling gaps constitute the primary source of degradation, represented an estimated area of 32.41 ha （2 % of the cutting area） far ahead of primary roads （18.44ha） and skid trails （16.36 ha）. Assessment of the impact of degradation under the canopy requires the use of high resolution satellite images and field surveys.

关键词： Forest logging Eastern Cameroon Carbon Satellite images REDD+

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Double ischemic ileal stenosis secondary to mesenteric injury after blunt abdominal trauma

引用

World Journal of Gastroenterology 2008年第1期14卷 143-145页

作者： Valérie Bougard Claude Avisse Martine Patey denis Germain Nathalie Levy-Chazal jean-Franois Delattre Service de Chirurgie Viscérale Digestive et Endocrinienne CHU Reims Hpital Robert Debré Reims France Martine Patey Laboratoire Central d’Anatomie et de Cytologie Pathologiques CHU Reims Hpital Robert Debré Reims France denis Germain Laboratoire Photographique CHU ReimsHpital Robert Debré Reims France

The authors describe a rare case in which blunt abdominal trauma resulted in mesenteric injury with delayed double ischemic ileal stenosis. Abdominal computed tomography demonstrated stenotic ileal loop with mural thickening. At surgery, a double stenotic bowel loop was found adjacent to a healed defect in the mesentery. Histological examination of the two resected segments showed fibrotic and ischemic lesions within the mesentery. Ischemic intestinal stenosis from mesenteric injury should be considered in the differential diagnosis in patients suffering from intestinal occlusion with a history of blunt abdominal trauma.

关键词： Blunt abdominal trauma Mesenteric injury Intestinal stenosis Obstruction

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Endovascular Repair of an Infected Broken Pseudoaneurysm of the Extracranial Internal Carotid Artery

引用

Open Journal of Radiology 2012年第4期2卷 113-116页

作者： Claude Michel Alain Parot Patrick Jue denis Pierre-Yves Laffy jean-Yves Riou Gilbert leblanc Cardio-Vascular Radiology Department Marie Lannelongue Hospital Le Plessis Robinson France Vascular Radiology Department Europe Medico-Surgical Center Le Port Marly France Vascular Surgery Department Europe Medico-Surgical Center Le Port Marly France

The formation of pseudoaneurysms after carotid endarterectomy is extremely rare. Treating those pseudoaneuryms is necessary because of the risks for continued expansion, rupture and distal embolism. Traditional surgical repair of carotid artery pseudoaneurysms is associated with a high morbidity and mortality. An endovascular approach to these infected pseudoaneurysms limits the risk for operative damage to surrounding structures and potential blood loss.

关键词： Carotid Artery Pseudoaneurysm Covered Self Expandable Stent

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：