检索结果-南通市图书馆

Impacts of wind erosion and seasonal changes on soil carbon dioxide emission in southwestern Iran

Journal of Arid Land 2020年第4期12卷 690-700页

作者： nadia kamali Hamid SIROOSI Ahmad SADEGHIPOUR Rangeland Research Division Research Institute of Forests and RangelandsAgricultural ResearchEducation and Extension Organization(AREEO)Tehran 13185116Iran Rangeland Sciences Gorgan University of Agricultural Researches and Natural ResourcesGorgan ***Iran Desert Studies Faculty Semnan UniversitySemnan ***Iran

Wind erosion is one of the main drivers of soil loss in the world, which affects 20 million hectare land of Iran. Besides the soil loss, wind erosion contributes to carbon dioxide emission from the soil into the atmosphere. The objective of this study is to evaluate monthly and seasonal changes in carbon dioxide emission in four classes i.e., low, moderate, severe and very severe soil erosion and the interactions between air temperature and wind erosion in relation to carbon dioxide emission in the Bordekhun region, Boushehr Province, southwestern Iran. Wind erosion intensities were evaluated using IRIFR(Iran Research Institute of Forests and Ranges) model, in which four classes of soil erosion were identified. Afterward, we measured carbon dioxide emission on a monthly basis and for a period of one year using alkali traps in each class of soil erosion. Data on emission levels and erosion classes were analyzed as a factorial experiment in a completely randomized design with twelve replications in each treatment. The highest rate of emission occurred in July(4.490 g CO_2/(m^2·d)) in severely eroded lands and the least in January(0.086 g CO_2/(m^2·d)) in low eroded lands. Therefore, it is resulted that increasing erosion intensity causes an increase in soil carbon dioxide emission rate at severe erosion intensity. Moreover, the maximum amount of carbon dioxide emission happened in summer and the minimum in winter. Soil carbon dioxide emission was just related to air temperature without any relationship with soil moisture content;since changes of soil moisture in the wet and dry seasons were not high enough to affect soil microorganisms and respiration in dry areas. In general, there are complex and multiple relationships between various factors associated with soil erosion and carbon dioxide emission. Global warming causes events that lead to more erosion, which in turn increases greenhouse gas emission, and rising greenhouse gases will cause more global warming. The

关键词： alkali trap arid areas global warming IRIFR model soil biology

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

Biochemical dissection of STAT3 signaling in amyotrophic lateral sclerosis

引用

Neural Regeneration Research 2025年第11期20卷 3229-3230页

作者： Savina Apolloni nadia D’Ambrosi Department of Biology University of Rome Tor VergataRomeItaly

Amyotrophic lateral sclerosis(ALS)is a progressive neurodegenerative disease characterized by the loss of upper and lower motor neurons,clinically marked by muscle atrophy and *** the clinical course is highly variable,the average time from the onset of symptoms to the need for respiratory support or death is 3-5 *** is the most prevalent motor neuron disease in adults,occurring at a rate of 2 per 100,000 individuals and affecting 5.4 per 100,000 individuals overall.

关键词： STAT3 dissection sclerosis

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

Commutators with Finite Spectrum Ⅱ

引用

Acta Mathematica Sinica,English Series 2009年第5期25卷 815-830页

作者： nadia BOUDI Département

The purpose of this paper is to study derivations d, d′ defined on a Banach algebra A such that the spectrum a（[dx, d′x]） is finite for all x ∈ A. In particular we show that if the algebra is semisimple, then the... 详细信息

关键词： Banach algebras derivations commutators finite spectra socle

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

Theoretical investigation on organolanthanide guanidinate complexes

引用

Journal of Rare Earths 2010年第2期28卷 161-165页

作者： Salima Lakehal nadia Ouddai Laboratory of Chemistry of Materials and Alive:Activity ReactivityFaculty of ScienceUniversity of Batna

Density functional theory (DFT) calculations were carried out on the compounds Cp2Ln-guan for Ln=Y, Lu, Yb, Dy and Gd, [guan=(iPrN)2CN(iPr)2]. The results were compared with the X-ray structures that were available from the literature; the calculations reproduced quite well the experimental structural features in these complexes exhibiting distorted tetrahedron geometry. The calculated evolution of the Ln-guan bond as a function of the cation showed that lanthanide-ligand distances increased with the increa...

关键词： DFT guanidinate organolanthanide HOMO LUMO rare earths

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

Mesopancreas:A boundless structure,namely the rationale for dissection of the paraaortic area in pancreaticoduodenectomy for pancreatic head carcinoma

引用

World Journal of Gastroenterology 2015年第10期21卷 2865-2870页

作者： nadia Peparini Azienda Sanitaria Locale Roma H- Distretto 3 00043 Ciampino (Rome)Italy

This review highlights the rationale for dissection of the 16a2 and 16b1 paraaortic area during pancreaticoduodenectomy(PD)for carcinoma of the head of the *** advances in surgical anatomy of the mesopancreas indicate that the retropancreatic area is not a single entity with well defined boundaries but an anatomical site of embryological fusion of peritoneal layers,and that continuity exists between the neuro lymphovascular adipose tissues of the retropancreaticand paraaortic *** advances in surgical pathology and oncology indicate that,in pancreatic head carcinoma,the mesopancreatic resection margin is the primary site for R1 resection,and that epithelialmesenchymal transition-related processes involved in tumor progression may impact on the prevalence of R1 resection or local recurrence rates after R0 *** concepts imply that mesopancreas resection during PD for pancreatic head carcinoma should be extended to the paraaortic area in order to maximize retropancreatic clearance and minimize the likelihood of an R1 resection or the persistence of residual tumor cells after R0 *** PD for pancreatic head carcinoma,the rationale for dissection of the paraaortic area is to control the spread of the tumor cells along the mesopancreatic resection margin,rather than to control or stage the nodal *** mesopancreatic resection cannot be considered"complete"or"en bloc",it should be"extended as far as possible"or be"maximal",including dissection of16a2 and 16b1 paraaortic areas.

关键词： Pancreatic carcinoma Mesopancreas Mesopancreas res

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

Digestive cancer surgery in the era of sentinel node and epithelial-mesenchymal transition

引用

World Journal of Gastroenterology 2013年第47期19卷 8996-9002页

作者： nadia Peparini Azienda Sanitaria Locale Roma H via Mario Calo’ 5 - 00043 CiampinoItalyItaly

Lymph node involvement is one of the most important prognostic indicators of carcinoma of the digestive *** the therapeutic impact of lymphadenectomy has not been proven and the number of retrieved nodes cannot be considered a measure of successful cancer surgery,an adequate lymph node count should be guaranteed to accurately assess the N-stage through the number of involved nodes,lymph node ratio,number of negative nodes,ratio of negative to positive nodes,and log odds,i.e.,the log of the ratio between the number of positive lymph nodes and the number of negative lymph nodes in digestive *** lymphadenectomy is not without complications,sentinel node mapping has been used as the rational procedure to select patients with early digestive carcinoma in whom nodal dissection may be omitted or a more limited nodal dissection may be ***,due to anatomical and technical issues,sentinel node mapping and nodal basin dissection are not yet the standard of care in early digestive ***,in light of the biological,prognostic and therapeutic impact of tumor budding and tumor deposits,two epithelial-mesenchymal transition-related phenomena that are involved in tumor progression,the role of staging and surgical procedures in digestive carcinomas could be redefined.

关键词： Lymph node count Lymph node ratio Sentinel node Tumor budding Tumor deposits

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 investigation and optimization of drag reduction in turbulent flow of Newtonian fluid passing through horizontal pipelines using functionalized magnetic nanophotocatalysts and lecithin

引用

Chinese Journal of Chemical Engineering 2020年第1期28卷 63-75页

作者： nadia Esfandiari Reza Zareinezhad Zahra Habibi Department of Chemical Engineering Marvdasht BranchIslamic Azad UniversityMarvdashtIran

The nanophotocatalysts were synthesized in four stages and evaluated by FTIR, FESEM and VSM analysis. The influence of nanofluids containing functionalized magnetic Ti O2 nanophotocatalyst and dipalmitoylphosphatidylcholine lecithin in drag reduction of turbulent flow in four horizontal pipelines was studied. The effective parameters on drag reduction(nanoparticle concentration, surfactant concentration, p H and Re number) were investigated and optimized in each pipeline using response surface method. The drag reduction in 1/2 " galvanized, 3/4" galvanized, 1/2 "five-layer and 1/2" cuprous pipelines was found 99.1%, 92.5%, 87.6% and 85.2%, respectively. The model adequacy was measured using ANOVA. Based on the high determination coefficient, more than 95% of variance of experimental data in all pipelines was described by quadratic model.

关键词： Drag reduction Lecithin Functionalized magnetic nanophotocatalyst Turbulent flow Response surface

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

HALOMETHYLATION OF POLYSTYRENE AND SUBSEQUENT PYRIDINATION VIA A HOMOLYTIC PATHWAY

引用

Chinese Journal of Polymer Science 2006年第6期24卷 627-635页

作者： Sad Moulay nadia Mehdi Laboratoire de Chimie-Physique Moléculaire et Macromoléculaire Faculté des Sciences de l'Ingénieur Departement de Chimie IndustrielleUniversité de BlidaRoute de SoumaB. P. 270Blida 09000Algeria

Chloromethylation of polystyrene （PS） with two different chloromethylating systems methylal/thionyl chloride and paraformaldehyde/trimethylchlorosilane was studied. Soluble chloromethylated polystyrene with a degree of substitution of 89% was obtained. The Conant-Finkelstein reaction on the chloromethylated PS afforded soluble iodomethylated polystyrene with a degree of substitution as high as 96%. The reaction conditions of Minisci were employed to radically pyridinate PS via its iodomethylated derivative. Polyelectrolytes were formed which could be converted to normal polymers by treatment with a 20% aqueous solution of NaOH.

关键词： Chloromethylated polystyrene Conditions of Minisci Iodomethylated polystyrene Pyridinated polystyrene.

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

Preservation of Juniperus thurifera L.:a rare endangered species in Algeria through in vitro regeneration

引用

Journal of Forestry Research 2019年第1期30卷 77-86页

作者： nadia Khater Halima Benbouza Faculté SNV Université Batna 2 Institut des Sciences Vétérinaires et Sciences Agronomiques Université Batna 1 Centre de Recherche en Biotechnologies

Juniperus thurifera *** an endemic Cupres saceae from the Aure`s Mountains of north eastern Algeria and endangered,in part,due to the scarcity of viable seeds It is threatened by other abiotic factors and the lack of an effective management strategy will increase its risk o *** dearth of information on its in vitro regeneration impedes its application in forest managemen *** therefore developed a micropropagation protocol using microcuttings with auxiliary *** were grown on different combinations of media supplemented with plant growth regulators at different *** highest number of shoots and branches regenerated from original shoots was obtained on Woody Plant Medium(WPM)supplemented with 6-benzylaminopurine(BAP)(0.5 mg L^(-1))and 2,4-dichlorophe noxyacetic acid(2,4-D)(0.25 mg L^(-1)).The best elongation of shoots was achieved with WPM supplemented with0.5 mg L^(-1)of BAP and 0.25 or 1 mg L^(-1) of 2,*** the second subculture,shoots had a higher number of branches than those of the *** highest rooting rate,38.8%,was obtained with shoots cultured in 1/2 Murashige and Skoog(MS)medium supplemented with 5.0 mg L^(-1)each of indol-3-butyric(IBA)and naphthalene acetic acid(NAA).Similarly,the highest root numbers and lengths were produced on 1/2 MS medium supplemented with IBA and NAA(5.0 mg L^(-1)each).During transfer to acclimatization,rates of plant losses of 50% *** second part of the experiment showed that the best shoot callusing was on WPM supplemented with BAP and 2,4-D,with either the combination 0.5+0.25 or 0.25+0.25 mg L^(-1).The results of this research provide a starting point for further studies on in vitro regeneration of *** for the sustainable management of its unique ecosystem in the Mediterranean basin.

关键词： Juniperus thurifera Callus Conservation Regeneration In vitro culture

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

The relation between a microscopic threshold-force model and macroscopic models of adhesion

引用

Acta Mechanica Sinica 2017年第3期33卷 508-515页

作者： Srivatsan Hulikal Kaushik Bhattacharya nadia Lapusta School of Engineering Brown University Department of Mechanical and Civil Engineering California Institute of Technology

This paper continues our recent work on the relationship between discrete contact interactions at the microscopic scale and continuum contact interactions at the macroscopic scale (Hulikal et al., J. Mech. Phys. Solids 76, 144-161, 2015). The focus of this work is on adhesion. We show that a collection of a large number of discrete elements governed by a threshold-force based model at the microscopic scale collectively gives rise to continuum fracture mechanics at the macroscopic scale. A key step is the introduction of an efficient numerical method that enables the computation of a large number of discrete contacts. Finally, while this work focuses on scaling laws, the methodology introduced in this paper can also be used to study rough-surface adhesion.

关键词： Adhesion Threshold-force model Johnson-Kendall-Roberts (JKR) theory Fracture Fast Multipole Method

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：