scholarly journals ANALYSIS OF THE MORPHOMETRIC CHARACTERISTICS OF LAKES OF THE EASTERN SIBERIAN LOWLAND BASED ON SENTINEL-2 DATA

2021 ◽  
Vol 2 (6) ◽  
pp. 46-52
Author(s):  
A.V. Volynets ◽  
◽  
E.I. Volynets ◽  
I.V. Fedorova ◽  
Keyword(s):  
Continuous Distribution ◽  
Shape Index ◽  
Maximum Diameter ◽  
Morphometric Characteristics ◽  
Statistical Parameters ◽  
Mean Values ◽  
Interior Edge ◽  
Warming Climate ◽  
Sentinel 2 ◽  
Important Marker

Processing of remote sensed data for mapping lakes and further analysis of lakes plain morphometric characteristics is considered. The study area includes two test sites located in the East Siberian Lowland. The lowland, characterized by the continuous distribution of permafrost, expressed in periglacial landscapes including thermokarst lakes, is particularly vulnerable under warming climate. An important marker for thermokarst monitoring is the morphometric characteristics of lakes widespread in the study area. A scheme was designed for processing satellite images obtained by Sentinel-2 with a 10 m spatial resolution. As a result, 397 lakes were identified in two test sites. For the selected lakes, the area, perimeter, shape index, interior edge ratio, the direction of the maximum diameter, and the shape factor of the polygon were calculated. The purpose of the statistical analysis was to check the hypothesis about the similarity of the plain morphometric characteristics of the lakes in the YanoIndigirskaya and Kolyma lowlands. For most indicators, the hypothesis of the equality of the mean values of the morphometric characteristics was not confirmed. However, the differences in statistical parameters are not large. The hypothesis of the equality is confirmed for the interior edge ratio of the polygon. The dependence of the obtained indicators on the type of landscape, terrain a

scholarly journals Variability of morphometric characteristics of Hungarian oak (Quercus frainetto Ten.) acorn

2020 ◽  
pp. 19-27
Author(s):  
Vladan Popović ◽  
Aleksandar Lučić ◽  
Ljubinko Rakonjac ◽  
Sanja Jovanović ◽  
Ivica Lazarević
Keyword(s):  
Forest Management ◽  
Shape Index ◽  
Management Unit ◽  
Future Research ◽  
Morphometric Characteristics ◽  
Mean Values ◽  
Planting Material ◽  
Starting Point ◽  
Length Width ◽  
Good Starting Point

The results of morphometric analysis of Hungarian oak seeds originating from Lipovica Forest Management Unit are presented in this paper. The seeds have been collected from 50 trees evenly distributed on the forest management unit area. The length, width and mass of acorns are measured on the sample consisting of 50 acorns per tree. The volume and shape index of acorns are calculated based on the measured values of their length and width. The mean values of morphometric characteristics obtained in research indicate there is a high variability among the studied genotypes. The latter has also been confirmed by means of an analysis of variance which determined statistically significant differences between the sampled mother trees for all the observed morphometric characteristics. The results obtained represent a good starting point for future research on breeding of the species and can be utilised for improvement of the mass production of high quality Hungarian oak planting material in Serbia.

Size-At-Age Variability and Sexual Dimorphism of Morphometric Characteristics in the Late Ontogenesis of the Marsh Frog, Pelophylax Ridibundus (Anura, Ranidae), from Terrytory of Crimea

2019 ◽  
Vol 53 (4) ◽  
pp. 325-334
Author(s):  
V. N. Peskov ◽  
N. A. Petrenko ◽  
V. Yu. Reminnyi
Keyword(s):  
Age Groups ◽  
The Body ◽  
Adult Males ◽  
Morphometric Characteristics ◽  
Morphometric Characters ◽  
Mean Values ◽  
Marsh Frog ◽  
Males And Females ◽  
Size At Age ◽  
Linear Body

Abstract We study size-at-age and sexual variability of morphometric characteristics of the marsh frog. According to the size of the body, males were divided into three size-age groups (juvenis, subadultus, adultus), females — into four groups (juvenis, subadultus, adultus, adultus-I). We found that the chronological age of frogs (skeletochronology) does not always correspond to their biological age (size and proportions of the body). We noted that the semi-adult males are reliably larger than females by mean values of 26 studied morphometric characters. Males and females of “adultus” group do not differ by linear body size, significant differences were found in body proportions (7 characters). For the females of “adultus-I” group, the mean values of 26 characters are significantly larger than for “adultus” males. The results of our study showed that with the age of the marsh frog, the level of exhibition, directionality and structure of morphometric sex differences changes.

The Most Important Risk Factors for Carpal Tunnel Syndrome

2021 ◽  
Author(s):  
Ali Asghar Sharifi
Keyword(s):  
Risk Factors ◽  
Carpal Tunnel Syndrome ◽  
Carpal Tunnel ◽  
Clinical Symptoms ◽  
Normal Subjects ◽  
Shape Index ◽  
Mean Values ◽  
Tunnel Syndrome ◽  
Independent Risk Factors ◽  
Hand Length

Background: The aim of this study was to determine the risk factors for carpal tunnel syndrome and its relationship with the severity of the disease. Methods: A total of 131 patients with clinical symptoms of CTS and 131 normal subjects were enrolled, of whom 121 were female both in the CTS cases and the controls. All cases were electro diagnostically confirmed and assigned to three severity groups. BMI, wrist ratio, shape index, digit index and hand length/height ratio were measured in all participants. Mean values for each item were compared between cases and controls and severity subgroups. A logistic regression analysis was performed to determine independent CTS risk factors. Results: The mean values of BMI, wrist ratio and shape index were significantly higher in all CTS patients and females compared to controls, whereas in males only BMI and wrist ratio were higher. The patients in the mild severity subgroup had a significantly lower age and wrist ratio. BMI, wrist ratio and shape index were found to be independent risk factors of CTS development in all patients and females. Conclusion: Our study showed BMI, wrist ratio and shape index as independent risk factors for CTS. These findings are important anatomically and clinically and these are the risk factors of anatomical malfunction of the wrist in CTS.

Nano-structured GeySi1-y:H Films Deposited by Low Frequency Plasma for Photovoltaic Application

2008 ◽  
Vol 1127 ◽  
Author(s):  
Andrey Kosarev ◽  
Alfonso Torres ◽  
Carlos Zuniga ◽  
Marco Adamo ◽  
Liborio Sanchez
Keyword(s):  
Electronic Properties ◽  
Urbach Energy ◽  
Low Frequency ◽  
Localized States ◽  
Statistical Parameters ◽  
Nano Structure ◽  
Mean Values ◽  
Temperature Dependence Of Conductivity ◽  
Wide Range ◽  
Grain Distribution

ABSTRACTIn this work we present the study of fabrication, Ge incorporation, structure and electronic properties of nano-structured GeySi1-y:H films with y>0.5 prepared by low frequency (LF) PECVD. GeySi1-y:H films were deposited by LF PECVD at a frequency f= 110 kHz from SiH4+GeH4+H2 gas mixture. SiH4 and GeH4 flows were varied to fabricate the films in wide range of 0<y<l. Hydrogen dilution was varied in the range of RH =20 to 80. Structure of the films was studied by AFM and SEM with consequent image processing to extract statistical parameters such as grain distribution and mean values. Composition of the films was characterized by SIMS and EDX. Electronic properties were characterized by temperature dependence of conductivity, spectral dependence of optical absorption. Sub-gap absorption was characterized by Urbach energy, EU; and defect absorption, αD. We observed grain like nano-structure with Gauss distribution of grain diameters by both AFM and SEM measurements. The most interesting films had mean grain diameter<D> = 24.0±0.7 nm, dispersion D=11.0±0.2 nm and fill factor FF=0.313, Ge content y=0.96-0.97(by SIMS and EDS). These films showed also the lowest values of Urbach energy EU = 0.030 eV and low defect absorption αD = 5×102 cm −1 (at photon energy hv = 1.04 eV) indicating on low density of localized states in mobility gap. Doped films have been also fabricated and studied. Finally we shall discuss application of the above films in photovoltaic devices.

scholarly journals Application of Neural Networks to the Classification of Pancreatic Intraductal Proliferative Lesions

2001 ◽  
Vol 23 (3-4) ◽  
pp. 129-136 ◽  
Author(s):  
Krzysztof Okoń ◽  
Romana Tomaszewska ◽  
Krystyna Nowak ◽  
Jerzy Stachura
Keyword(s):  
Neural Networks ◽  
Back Propagation ◽  
Ccd Camera ◽  
Maximum Diameter ◽  
Network Simulator ◽  
Image Analysis System ◽  
Back Propagation Algorithm ◽  
Mean Values ◽  
Starting Point

The aim of the study was to test applycability of neural networks to classification of pancreatic intraductal proliferative lesions basing on nuclear features, especially chromatin texture. Material for the study was obtained from patients operated on for pancreatic cancer, chronic pancreatitis and other tumours requiring pancreatic resection. Intraductal lesions were classified as low and high grade as previously described. The image analysis system consisted of a microscope, CCD camera combined with a PC and AnalySIS v. 2.11 software. The following texture characteristics were measured: variance of grey levels, features extracted from the grey levels correlation matrix and mean values, variance and standard deviation of the energy obtained from Laws matrices. Furthermore we used moments derived invariants and basic geometric data such as surface area, the minimum and maximum diameter and shape factor. The sets of data were randomly divided into training and testing groups. The training of the network using the back‐propagation algorithm, and the final classification of data was carried out with a neural network simulator SNNS v. 4.1. We studied the efficacy of networks containing from one to three hidden layers. Using the best network, containing three hidden layers, the rate of correct classification of nuclei was 73%, and the rate of misdiagnosis was 3%; in 24% the network response was ambiguous. The present findings may serve as a starting point in search for methods facilitating early diagnosis of ductal pancreatic carcinoma.

scholarly journals Morphometric characteristics of the sphenoid sinus and potential influencing factors: a retrospective assessment using cone beam computed tomography (CBCT)

2021 ◽  
Author(s):  
Pradeep Singh ◽  
Kuofeng Hung ◽  
Deepal Haresh Ajmera ◽  
Andy Wai Kan Yeung ◽  
Thomas von Arx ◽  
...  
Keyword(s):  
Influencing Factors ◽  
Sphenoid Sinus ◽  
Morphological Characteristics ◽  
Cone Beam ◽  
Maximum Diameter ◽  
Morphometric Characteristics ◽  
Retrospective Assessment ◽  
Morphometric Features ◽  
Automatic Software ◽  
The Impact

AbstractThe present study aimed to evaluate the morphological characteristics of the sphenoid sinus (SS), and the impact of potential influencing factors on the morphometric features using CBCT imaging. CBCT scans of 148 patients, aged between 15 and 85 (32.88 ± 15.33) years were retrospectively evaluated. DICOM files from the CBCT scans were imported into semi-automatic software and the SS of each patient was assessed for the morphological characteristics including configuration, symmetry, extension, shape, septation, volume, and maximum diameter. Furthermore, potential influencing factors such as age, gender, side, and sinus condition were analysed. A significant association was observed between sinus extension and age. Septation was also found to be significantly associated with age, gender and sinus condition. Besides, sinus volume was significantly associated with gender and sinus condition. No significant influence of shape and side on the morphometric features was noticed. The average volume and diameter of the SS were 6576.92 ± 3748.12 mm3 and 30.48 ± 9.28 mm, respectively. In conclusion, the present findings indicate that age, gender and sinus condition have a significant impact on the morphometric characteristics of the SS. Mature sinuses exhibit a post-sellar extension pattern until middle age. In addition, males, and sinuses with healthy sinus condition have larger volumes compared to females and pathological sinuses.

scholarly journals Assessment of Water Quality Parameters Using Temporal Remote Sensing Spectral Reflectance in Arid Environments, Saudi Arabia

Water ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 556 ◽  
Author(s):  
Mohamed Elhag ◽  
Ioannis Gitas ◽  
Anas Othman ◽  
Jarbou Bahrawi ◽  
Petros Gikas
Keyword(s):  
Remote Sensing ◽  
Water Quality ◽  
Remote Sensing Data ◽  
Quality Parameters ◽  
Water Quality Parameters ◽  
Arid Environments ◽  
Water Turbidity ◽  
Mean Values ◽  
Sensing Data ◽  
Sentinel 2

Remote sensing applications in water resources management are quite essential in watershed characterization, particularly when mega basins are under investigation. Water quality parameters help in decision making regarding the further use of water based on its quality. Water quality parameters of chlorophyll a concentration, nitrate concentration, and water turbidity were used in the current study to estimate the water quality parameters in the dam lake of Wadi Baysh, Saudi Arabia. Water quality parameters were collected daily over 2 years (2017–2018) from the water treatment station located within the dam vicinity and were correspondingly tested against remotely sensed water quality parameters. Remote sensing data were collected from Sentinel-2 sensor, European Space Agency (ESA) on a satellite temporal resolution basis. Data were pre-processed then processed to estimate the maximum chlorophyll index (MCI), green normalized difference vegetation index (GNDVI) and normalized difference turbidity index (NDTI). Zonal statistics were used to improve the regression analysis between the spatial data estimated from the remote sensing images and the nonspatial data collected from the water treatment plant. Results showed different correlation coefficients between the ground truth collected data and the corresponding indices conducted from remote sensing data. Actual chlorophyll a concentration showed high correlation with estimated MCI mean values with an R2 of 0.96, actual nitrate concentration showed high correlation with the estimated GNDVI mean values with an R2 of 0.94, and the actual water turbidity measurements showed high correlation with the estimated NDTI mean values with an R2 of 0.94. The research findings support the use of remote sensing data of Sentinel-2 to estimate water quality parameters in arid environments.

scholarly journals STATISTICAL MEASURES AND DIFFUSION DYNAMICS IN A MODIFIED CHUA'S CIRCUIT EQUATION WITH MULTISCROLL ATTRACTORS

2012 ◽  
Vol 22 (01) ◽  
pp. 1250004 ◽  
Author(s):  
G. SAKTHIVEL ◽  
S. RAJASEKAR ◽  
K. THAMILMARAN ◽  
SYAMAL KUMAR DANA
Keyword(s):  
Control Parameter ◽  
Mean Square Displacement ◽  
Continuous Distribution ◽  
Discrete Distribution ◽  
Chaotic Attractors ◽  
Chua’S Circuit ◽  
Mean Values ◽  
Chua's Circuit ◽  
Statistical Measures ◽  
Diffusion Dynamics

In this paper the focus is set on a modified Chua's circuit model equation with saw-tooth function in place of piecewise linear function of Chua's circuit displaying multiscroll chaotic attractors. We study the characteristic properties of first passage times (t FPT s ) to nth scroll chaotic attractor, residence times (t RT s ) on a scroll attractor and returned times (t RET s ) to the middle-scroll attractor. t FPT s exhibit a series of Gaussian-like distribution followed by a long tail continuous distribution. t RT s and t RET s show completely discrete distribution. Power-law variation of mean values of t FPT s , t RT s and t RET s with a control parameter is found. On the other hand, mean values of t FPT s and t RET s have linear dependence with the number of scroll attractors for fixed values of the control parameter. For the system with infinite scroll chaotic attractors normal diffusive motion occurs. In the normal diffusion process the mean square displacement grows linearly with time.

scholarly journals Long term investigations of flowers and leaves on mainly non-domestica plums

2005 ◽  
Vol 11 (1) ◽  
Author(s):  
D. Surányi
Keyword(s):  
Shape Index ◽  
Point Of View ◽  
Limiting Factors ◽  
Plum Pox Virus ◽  
Mean Values ◽  
Stamen Number ◽  
Bitter Almond ◽  
Peduncle Length ◽  
The One

The author dealt with plum species representing different eco-geographic areas by their genetic adaptation and their hybrids, as European (P. domestica, P. italica, P. cerasifera), Asian (P. salicina, P. simonii, P. ussuriensis), American (P. americana, P. besseyi, P. munsoniana, P. tomentosa). The rootstocks of the trees examined were seedlings of C. 679 myrobalan with the exception of Laroda and Santa Rosa II, which were grown on three different stocks: seedlings of C. 174 myrobalan, C. 449 bitter almond and C. 471 sweet almond. The size of peduncle, length of pistil, stamen number per flower, relative stamen number (SN/PL) have been suitable for description and distinction of varieties. Similarly shape of leaves, length of petiole, length and width of blade helped the identification. The ratio of the dimensions of leaves, length of petiole and of leaf blade, also contributed to the distinction of European, Asian and American plum species, notwithstanding their relations with ecological conditions as well as historical, technical properties, pomological features, etc. Computed indicators (relative stamen number and shape-index of leaves) also have been useful data. Significant correlations have been found between colour of nectaries and mean values of variety-groups. The potential values of non-European varieties for purposes of commercial production could be forecasted from the point of view of quality, ecological, pomological as well as market value. It is important, however, to know the effect of the rootstock and growing site as well as their interaction, on the one hand, whereas the resistance or tolerance of the varieties as limiting factors, at least to the sharka (Plum pox) virus, Xanthomonas pruni, on the other hand (cf. Surányi & Erdős, 2004a and 2004b).

scholarly journals Ecotypical characterization of genetic variation of beech provenances from south-eastern Europe based on the morphometric characteristics of leaves

2012 ◽  
pp. 197-214 ◽  
Author(s):  
Mirjana Sijacic-Nikolic ◽  
Jelena Milovanovic ◽  
Marina Nonic ◽  
Radmila Knezevic ◽  
Violeta Babic
Keyword(s):  
Eastern Europe ◽  
Global Climate ◽  
Leaf Length ◽  
Research Centre ◽  
Morphometric Characteristics ◽  
Mean Values ◽  
South Eastern ◽  
Seed Sources ◽  
Provenance Test ◽  
South Eastern Europe

The research was conducted on a provenance test of beech established in the Educational-research centre ?Majdanpecka domena? - Faculty of Forestry, University of Belgrade. This paper presents the results of an analysis of the morphometric characteristics of leaves, at the level of 10 provenances in the juvenile developmental stage, originating from South-Eastern Europe. Herbaria material was used to measure the following parameters: leaf length, leaf width, petiole length, leaf base width at 1 cm (from petiole base), the number of veins -on the left, the number of veins - on the right, and distance between the 3rd and 4th vein - on the left. Based on research results, it can be concluded that the obtained differences between the mean values of all measured foliar characteristics of the analyzed provenances are statistically significant, and that there is significant correlation between the length and width of leaves and the Ellenberg?s quotient (EQ). The relationship between the adaptive traits of beech from different provenances and ecological parameters of their seed source stands indicates genetic differentiation of beech, as a consequence of the population adaptation to local environmental conditions. Therefore, in the future, ecological criteria must be a priority in the selection of seed sources and planting materials, with special consideration of the global climate change.

Sign in / Sign up

Export Citation Format

Share Document