检索结果-南通市图书馆

Bank erosion in an Andean páramo river system: Implications for hydro-development and carbon dynamics in the neotropical Andes

引用

journal of Mountain Science 2019年第2期16卷 243-255页

作者： Derek j.martin Christopher ELY Beverley C.WEMPLE Department of Geography and Planning Appalachian State University Department of Geography University of Vermont

The páramo of the Northern Andes provide critically important ecosystem services to the Northern Andean region in the form of water provisioning and carbon sequestration, both of which are a result of the páramo?s organic-rich soils. Little is known, however, about the hydro-geomorphic characteristics of the rivers that drain these ecosystems. With impending plans for widespread hydro-development and increasing implementation of carbon-sequestering compensation for ecosystem services programs in the region it is imperative that we develop a thorough understanding of the hydrogeomorphic role that rivers play in this unique ecosystem. The objective of this study was to quantify bank erosion along an Amazonian headwater stream draining a small, relatively undisturbed páramo catchment to gain a better understanding of the natural erosion regime and the resulting sediment contributions from this unique ecosystem. This study implemented a combination of field, laboratory, and Geographic Information Systems techniques to quantify bank erosion rates and determine a bank erosion sediment yield from the Ningar River, a small páramo catchment(22.7 km^2) located in the eastern Andean cordillera of Ecuador. Results show that bank erosion rates range from 3.0 to ≥ 390.0 mm/yr, are highly episodic, and yield at least 487 tons of sediment annually to the Ningar River. These results imply that 1) páramo ecosystems substantially contribute to the sediment load of the Amazon River basin; 2) bank erosion is a potentially significant flux component of basin-scale carbon cycles in páramo ecosystems; and 3) hydrologic alteration campaigns(dam building) will likely critically alter these contributions and concomitantly disconnect a critical source of sediment and nutrients to downstream ecosystems.

关键词： Bank erosion Páramo Fluvial geomorphology Andes

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

Diffuse optical tomography in the human brain: A briefly review from the neurophysiology to its applications

引用

Brain Science Advances 2020年第4期6卷 289-305页

作者： Estefania Hernandez-martin joséLuis gonzalez-Mora Department of Basic Medical Science Faculty of Health ScienceMedicine SectionUniversidad de La Laguna38071Spain

The present work describes the use of noninvasive diffuse optical tomography(DOT)technology to measure hemodynamic changes,providing relevant information which helps to understand the basis of neurophysiology in the human *** such as portability,direct measurements of hemoglobin state,temporal resolution,non-restricted movements as occurs in magnetic resonance imaging(MRI)devices mean that DOT technology can be used in research and clinical *** this review we covered the neurophysiology,physical principles underlying optical imaging during tissue-light interactions,and technology commonly used during the construction of a DOT device including the source-detector requirements to improve the image *** provides 3 D cerebral activation images due to complex mathematical models which describe the light propagation inside the tissue ***,we describe briefly the use of Bayesian methods for raw DOT data filtering as an alternative to linear filters widely used in signal processing,avoiding common problems such as the filter selection or a false interpretation of the results which is sometimes due to the interference of background physiological noise with neural activity.

关键词： diffuse optical imaging image reconstruction algorithms filtering DOT data biomedical applications

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

Nuclear receptors and non-alcoholic fatty liver disease:An update

引用

Liver Research 2020年第2期4卷 88-93页

作者： Xiao Yang Frank j.gonzalez Min Huang Huichang Bi Guangdong Provincial Key Laboratory of New Drug Design and Evaluation School of Pharmaceutical SciencesSun Yat-sen UniversityGuangzhouChina Laboratory of Metabolism Center for Cancer ResearchNational Cancer InstituteNIHBethesdaMDUSA

Non-alcoholic fatty liver disease(NAFLD)has become the leading cause of chronic liver disease in adults and children *** symptoms of NAFLD range from simple steatosis and non-alcoholic stea-tohepatitis(NASH)to hepatic fibrosis or cirrhosis,even ultimately develops to hepatocellular *** receptors(NRs)are a superfamily of ligand-activated transcription factors,most of which are ligand-activated that control cellular homeostasis in the liver and other tissues.A growing number of studies demonstrated the important role of NRs in *** this review,the current findings on the role of NRs in NAFLD are summarized and future perspectives to target NRs for NAFLD are discussed.

关键词： Nuclear receptors(NRs) Non-alcoholic fatty liver disease(NAFLD) Pregnane X receptor(PXR) Constitutive androstane receptor(CAR) Farnesoid X receptor(FXR) Peroxisome proliferator activated receptor (PPAR) Liver X receptor(LXR)

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

High Intensity Interval Training：New Insights

引用

中国运动医学杂志 2008年第3期27卷 371-377页

作者： martin j.Gibala Department of Kinesiology McMaster University1280 Main Street West HamiltonOntario L8S 4K1Canad PhD

KEY POINTS· High-intensity interval training(HIT)is characterized by repeated sessions of relatively brief,intermittent exercise,often performed with an 'all out' effort or at an intensity close to that which elicits... 详细信息

关键词：高强度训练体育运动锻炼方法间歇性训练法

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

Surgical outcomes for cutaneous squamous cell carcinoma of the auricle

引用

World journal of Otorhinolaryngology-Head and Neck Surgery 2023年第4期9卷 295-301页

作者： Constantin Manole Liam j.Skinner martin j.Donnelly Department of Otolaryngology/Head and Neck Surgery University Hospital WaterfordWaterfordRepublic of Ireland Consultant in Otolaryngology/Head and Neck Surgery University Hospital WaterfordWaterfordRepublic of Ireland

Background:Cutaneous squamous cell carcinoma (CSCC) on the auricle is believed to carry a higher risk of metastatic *** rates of lymphatic metastasis reported in the literature have varied *** are no established prognostic criteria to determine which of these tumors are higher risk and warrant prophylactic treatment of the associated lymphatic ***:To retrospectively evaluate outcomes after surgical treatment of auricular CSCC in our department,examining excision completeness,tumor recurrence,and lymphatic ***,to identify factors associated with lymphatic ***:One hundred and thirty‐eight consecutive cases of auricular SCC were excised from 126 patients in our department over a 7‐year period (january 2012–December 2018).Data were retrospectively collected on patient characteristics,tumor histology,surgical procedures,and follow‐***:Incomplete initial excision occurred in 17 cases (12.32%).Six patients (4.76%) had a local *** metastasis occurred in eight patients (6.35%),on average within 10.25 months after primary *** patients with metastasis died during follow‐up,with a mean survival of 10.2 *** age was associated with lymphatic metastasis (P = 0.0267).Other factors,including tumor recurrence,size,grade,cartilage invasion,and positive margins,were evaluated and not significantly associated with ***:In this study,the metastatic rate of auricular SCC was 6.35%,which is within the previously reported *** histological prognostic factors were identified in this study,which may be due to our limited sample *** the absence of established prognostic criteria,decisions regarding prophylactic treatment should be made on an individual basis with multidisciplinary support.

关键词： cutaneous malignancy external ear metastasis squamous cell carcinoma

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

Critical review of strategies for CO_2 delivery to large-scale microalgae cultures

引用

Chinese journal of Chemical Engineering 2018年第11期26卷 2219-2228页

作者： Qi Zheng Xiaoyin Xu Gregory j.O.martin Sandra E.Kentish Peter Cook Centre for CCS Research Department of Chemical EngineeringThe University of Melbourne Algal Processing Group Department of Chemical EngineeringThe University of Melbourne

Microalgae have great, yet relatively untapped potential as a highly productive crop for the production of animal and aquaculture feed, biofuels, and nutraceutical products. Compared to conventional terrestrial crops they have a very fast growth rate and can be produced on non-arable land. During microalgae cultivation, carbon dioxide(CO_2) is supplied as the carbon source for photosynthesising microalgae. There are a number of potential CO_2 supplies including air, flue gas and purified CO_2. In addition, several strategies have been applied to the delivery of CO_2 to microalgae production systems, including directly bubbling CO_2-rich gas, microbubbles, porous membrane spargers and non-porous membrane contactors. This article provides a comparative analysis of the different CO_2 supply and delivery strategies and how they relate to each other.

关键词： Bubble Carbon dioxide Flue gas Bioreactors

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

Recognition of nestmate eggs in the ant Formicafusca is based on queen derived cues

引用

Current Zoology 2014年第1期60卷 131-136页

作者： Heikki HELANTERA Stephen j. martin Francis L.W. RATNIEKS Centre of Excellence in Biological Interactions Department of Biosciences POB 65 University of Helsinki Finland School of Environment & Life Sciences University of Salford Manchester M5 4WT UK Laboratory ofApiculture & Social Insects (LASI) School of Life Sciences University of Sussex Falmer Brighton UK

Inclusive fitness benefits depend on recognizing the right individuals to interact with. Social insect nests protect themselves from non-kin intruders through nestmate recognition based on chemical cues. The recognition cues on adult individu- als are from a mixture of genetic and environmental sources, but the ontogeny and use of recognition cues on eggs has not been previously assessed. We studied recognition by workers of eggs that were either nestmates or non-nestmates, and the ontogeny of recognition cues on eggs in the ant Formica fusca, a species with precise egg recognition abilities. Workers were able to dis- criminate among freshly laid eggs with no nest derived cues on them, and the egg surface chemicals varied among nests in these eggs, suggesting that queen derived cues are used in nestmate recognition. The results are discussed in the light of their implica- tions on deceptive social parasite strategies and within colony conflicts

关键词： Nestmate recognition Social insects Social parasitism Formicafusca Cuticular hydrocarbons

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

The Quaternary： its character and definition

引用

Episodes 2008年第2期31卷 234-238页

作者： martin j. Head Philip Gibbard Amos Salvador Department of Earth Sciences Brock University 500 Glenridge Avenue St. Catharines Ontario L2S 3A 1 Canada. Cambridge Quaternary Department of Geography University of Cambridge Downing Place Cambridge CB2 3EN United Kingdom. Department of Geological Sciences University of Texas at Austin AustinTexas 78712 U.S.A.

The Quaternary, is characterised by the development of widespread glaciations in mid-northern latitudes. As a chronostratigraphic term it has attracted vigorous debate. The Quaternao; as accepted by the International Union for Quaternary Research and proposed by the International Commission on Stratigraphy, begins at 2.6 Ma within a 2.8-2.4 Ma interval of profound change in Earth＇s climate system.

关键词：第四纪地质时代地球特征清晰度

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

The Tertiary： a proposal for its formal definition

引用

Episodes 2008年第2期31卷 248-250页

作者： martin j. Head Philip Gibbard Amos Salvador Department of Earth Sciences Brock University 500 Glenridge Avenue St. Catharines Ontario L2S 3A1 Canada. Cambridge Quaternary Department of Geography University of Cambridge Downing Place Cambridge CB2 3EN United Kingdom. Department of Geological Sciences University of Texas at Austin Austin Texas 78712 U.S.A.

The term Tertiary, subdivided into the Paleogene and Neogene, is traditionally used to represent the interval of geological time between the Cretaceous and Quaternary. In the 1990s, however, the Neogene and Paleogene were ratified by the International Union of Geological Sciences as periods/systems of the Cenozoic Era/Erathem, leaving the Tertiary officially undefined. The Tertiary nonetheless remains a formal term that has never been officially eliminated, and its widespread use today implies a long future.

关键词：地球第三纪地质时代清晰度地质学

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

Corrosion and passive film characteristics of 3D-printed NiTi shape memory alloys in artificial saliva

引用

Rare Metals 2023年第9期42卷 3114-3129页

作者： Ming Liu j.a.Ning Zhu V.A.Popovich E.Borisov j.M.C.Mol Y.gonzalez-Garcia State Key Laboratory for Mechanical Behavior of Materials Center for Advancing Materials Performance from the Nanoscale(CAMP-Nano)Xi’an Jiaotong UniversityXi’an710049China Department of Materials Science and Engineering Delft University of TechnologyAA Delft2600The Netherlands Peter the Great Saint-Petersburg Polytechnic University Saint Petersburg195251Russia

Electrochemical tests and surface analysis were applied to study the corrosion behavior and passive film characteristics of three-dimensional-printed NiTi shape memory alloys fabricated by laser-powder bed fusion(LPBF) in artificial saliva at 37.C. The passivity of L-PBF NiTi shows to be influenced by the process parameters and resulting morphological and physicochemical surface properties. The results show that the defects at the surface of L-PBF Ni Ti can promote the passivation rate in the early stages of exposure but a slowly formed passive film shows the best corrosion protection. The thickness of the passive film is positively correlated with its corrosion protective performance. The L-PBF NiTi alloy prepared at a linear energy density of 0.2 j·m^(-1) and volumetric energy density of 56 j·mm^(-3) shows the least defects and best corrosion protection. An outer Ti-rich and inner Ni-rich dense passive film could be also obtained showing higher corrosion resistance.

关键词： NiTi Laser-powder bed fusion(L-PBF) Passive film Corrosion resistance Artificial saliva

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

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：