نتایج جستجو برای: canonical correspondence analysis

تعداد نتایج: 2924775  

Journal: :جنگل و فرآورده های چوب 0
هاشم کنشلو استادیار، مؤسسة تحقیقات جنگل ها و مراتع کشور، تهران، ایران غلامرضا دمی زاده مربی پژوهشی، مرکز تحقیقات کشاورزی و منابع طبیعی هرمزگان، بندرعباس، ایران

moringa pregerina (forssk.) fiori.,capparis decidua (forssk.) edgew. and salvadora oleides decne. are important indegenious shrub or tree species of sahara-sindian region which distributed and formed scattered woodlands in south east of iran. the current research was carried out to find most effective soil characteristics intheir distribiution. for this purpose, a study was conducted in the bal...

Journal: :journal of agricultural science and technology 2015
a. x. zhou y. l. zhang j. y. dang x. s. su

the objective of this study was to explore the microbial community diversities and the relationships between microbial community compositions and hydrochemical factors in nitrate contaminated groundwater of hun river alluvial plain. the method of polymerase chain reaction (pcr)-denaturing, gradient gel electrophoresis (dgge) gene fingerprints combined with canonical correspondence analysis(cca)...

Journal: :Aquatic research 2021

The study was conducted to assess the species composition, substrate specificity, and seasonal abundance of periphytic algae from river Periyar. Monthly samples were collected for one year (June 2016 – May 2017) different substrates five selected stations. Eight physicochemical variables such as temperature, dissolved oxygen, pH, conductivity, chloride, sulfate, nitrate, phosphate also monitore...

Do climatic variations and drought magnitude affect large-scale vegetation composition in the Central Zagrosian forests, and to what extent do topographic variables of altitude and aspect play a role in these potential differences? To answer this question, in this research, the flora list of 15 Central Zagros forests was obtained in five plant life forms between the valleys of two rivers, Gerdb...

2013
N. A. Rahim Z. Ahmad

Irrelevant inputs can cause deterioration of the network performance. This paper aims to implement features selection for water quality prediction model as the neural network generalization may be improved when the number of measured variables is reduced. Canonical Correspondence Analysis (CCA) was introduced as a feature selection method, where it choose a subset of input variables by eliminat...

پایان نامه :دانشگاه بین المللی امام خمینی (ره) - قزوین - دانشکده علوم اجتماعی 1387

چکیده ندارد.

2016
Yung-Chul Jun Nan-Young Kim Sang-Hun Kim Young-Seuk Park Dong-Soo Kong Soon-Jin Hwang Kevin Strychar

Conserving and enhancing freshwater biodiversity are global issues to ensure ecosystem integrity and sustainability. To meet this, it is critical to understand how the biological assemblages are determined by environmental gradients in different spatial scales. Nevertheless, information on their large-scale environmental relationships remains scarce in Korea. We aimed to understand nationwide s...

2009
Yuemin Yue Kelin Wang Bo Liu Bing Zhang Ru Li Quanjun Jiao Yizun Yu

As band widths are narrow and range of spectra is wide, subtle differences in spectral features can be extracted and used for mapping physical and chemical properties of bare substrate with imaging spectroscopy. However, the use of spectral characteristics of substrates is not accessible if substrate was covered by vegetation. In this study, we explored the feasibility of extracting karst ecoen...

Journal: :Medical image analysis 2014
Dongdong Lin Vince D. Calhoun Yu-Ping Wang

Both genetic variants and brain region abnormalities are recognized as important factors for complex diseases (e.g., schizophrenia). In this paper, we investigated the correspondence between single nucleotide polymorphism (SNP) and brain activity measured by functional magnetic resonance imaging (fMRI) to understand how genetic variation influences the brain activity. A group sparse canonical c...

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