Analytical shape computation of macromolecules: I. molecular area and volume through alpha shape

There was a method developed that generates the three-dimensional model of not axisymmetric produce, based on an arbitrary number of photos. The model can serve as a basis for calculating the surface area and the volume of produce. The efficiency of the reconstruction was tested on bell peppers and artificial shapes. In case of bell peppers 3-dimensional reconstruction was created from 4 images rotated in 45° angle intervals. The surface area and the volume were estimated on the basis of the reconstructed area. Furthermore, a new and simple reference method was devised to give precise results for the surface area of bell pepper. The results show that this 3D reconstruction-based surface area and volume calculation method is suitable to determine the surface area and volume of definite bell peppers with an acceptable error.

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Correlation Between DTI Findings and Volume of Corpus Callosum in Children with AUTISM

Current Medical Imaging Formerly Current Medical Imaging Reviews ◽

10.2174/1573405614666181005114315 ◽

2019 ◽

Vol 15 (9) ◽

pp. 895-899 ◽

Cited By ~ 1

Author(s):

Hafize Otcu Temur ◽

Ismail Yurtsever ◽

Gozde Yesil ◽

Rasul Sharifov ◽

Fatih Temel Yilmaz ◽

...

Keyword(s):

Corpus Callosum ◽

Cortical Neurons ◽

Diffusion Tensor ◽

Children With Autism ◽

Autism Spectrum ◽

Children With Asd ◽

Volume Measurements ◽

Adc Values ◽

Axonal Density ◽

Area And Volume

Background: Autism Spectrum Disorder (ASD) is a complex developmental disorder in which neurological basis is largely unknown. The Corpus Callosum (CC) is the main commissure that connects the cerebral hemispheres. Previous evidence suggests the involvement of the CC in the pathophysiology of autism. Aim: The aim of our study is to assess whether there were any changes in Corpus Callosum (CC) area and volume and to reveal the relationship between Diffusion Tensor Imaging (DTI) features in genu and splenium of corpus callosum in children with ASD. Methods: Eighteen patient and 15 controls were recruited. The volumetric sagittal TI images were used to provide measurements of midsagittal corpus callosum surface area while FA, MD, RD, and ADC values were extracted from genu and splenium of corpus callosum after which the correlation in the area and volume in ASD children was examined. Results: CC area and volume in children with ASD were decreased than controls. FA values obtained from the genu and splenum of CC were significantly lower and RD values were significantly higher. A positive correlation was observed between the FA of the genu and splenium and area and volume of the CC. There was a negative correlation between ADC, MD and RD of CC and area and volume measurements. Conclusion: The conclusions in the interrelations of morphometric and DTI data may demonstrate a likelihood of damages in the axons and cortical neurons. The results showed that there existed microstructural damages from the DTI findings. Furthermore, the decrease in FA could be a representation of the reduction in the myelination in nerve pathways, impaired integrity, reduced axonal density, and organization. Indeed, the changes in volumetric and microstructural of CC could be useful in evaluating underlying pathophysiology in children with autism.

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AUTOMATED ORE BODY MODELING USING MACHINE LEARNING-BASED IMPUTATION AND ALPHA-SHAPE CONSTRUCTION

10.1130/abs/2020am-357016 ◽

2020 ◽

Author(s):

Hoon Seo ◽

◽

Lyujian Lu ◽

Thomas Monecke ◽

...

Keyword(s):

Machine Learning ◽

Alpha Shape ◽

Ore Body

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Canopy Parameter Estimation of Citrus grandis var. Longanyou Based on LiDAR 3D Point Clouds

Remote Sensing ◽

10.3390/rs13091859 ◽

2021 ◽

Vol 13 (9) ◽

pp. 1859

Author(s):

Xiangyang Liu ◽

Yaxiong Wang ◽

Feng Kang ◽

Yang Yue ◽

Yongjun Zheng

Keyword(s):

Convex Hull ◽

Clustering Algorithm ◽

Plant Protection ◽

Point Clouds ◽

Biomass Estimation ◽

Reconstruction Method ◽

Volume Calculation ◽

Alpha Shape ◽

3D Point Clouds ◽

Canopy Volume

The characteristic parameters of Citrus grandis var. Longanyou canopies are important when measuring yield and spraying pesticides. However, the feasibility of the canopy reconstruction method based on point clouds has not been confirmed with these canopies. Therefore, LiDAR point cloud data for C. grandis var. Longanyou were obtained to facilitate the management of groves of this species. Then, a cloth simulation filter and European clustering algorithm were used to realize individual canopy extraction. After calculating canopy height and width, canopy reconstruction and volume calculation were realized using six approaches: by a manual method and using five algorithms based on point clouds (convex hull, CH; convex hull by slices; voxel-based, VB; alpha-shape, AS; alpha-shape by slices, ASBS). ASBS is an innovative algorithm that combines AS with slices optimization, and can best approximate the actual canopy shape. Moreover, the CH algorithm had the shortest run time, and the R2 values of VCH, VVB, VAS, and VASBS algorithms were above 0.87. The volume with the highest accuracy was obtained from the ASBS algorithm, and the CH algorithm had the shortest computation time. In addition, a theoretical but preliminarily system suitable for the calculation of the canopy volume of C. grandis var. Longanyou was developed, which provides a theoretical reference for the efficient and accurate realization of future functional modules such as accurate plant protection, orchard obstacle avoidance, and biomass estimation.

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Observation-based selection of climate models projects Arctic ice-free summers around 2035

Communications Earth & Environment ◽

10.1038/s43247-021-00214-7 ◽

2021 ◽

Vol 2 (1) ◽

Author(s):

David Docquier ◽

Torben Koenigk

Keyword(s):

Model Selection ◽

Sea Ice ◽

Climate Models ◽

Global Climate ◽

Coupled Model ◽

Arctic Sea Ice ◽

Global Climate Models ◽

The Arctic ◽

Arctic Sea ◽

Area And Volume

AbstractArctic sea ice has been retreating at an accelerating pace over the past decades. Model projections show that the Arctic Ocean could be almost ice free in summer by the middle of this century. However, the uncertainties related to these projections are relatively large. Here we use 33 global climate models from the Coupled Model Intercomparison Project 6 (CMIP6) and select models that best capture the observed Arctic sea-ice area and volume and northward ocean heat transport to refine model projections of Arctic sea ice. This model selection leads to lower Arctic sea-ice area and volume relative to the multi-model mean without model selection and summer ice-free conditions could occur as early as around 2035. These results highlight a potential underestimation of future Arctic sea-ice loss when including all CMIP6 models.

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A Repeatable and Reproducible Digital Method to Quantify the Cement Excess and Enamel Loss after Debonding Lingual Multibracket Appliance Therapy

Applied Sciences ◽

10.3390/app11031295 ◽

2021 ◽

Vol 11 (3) ◽

pp. 1295

Author(s):

Alba Belanche Monterde ◽

Alberto Albaladejo Martínez ◽

Alfonso Alvarado Lorenzo ◽

Adrián Curto ◽

Jorge Alonso Pérez-Barquero ◽

...

Keyword(s):

Measurement Technique ◽

Measurement Method ◽

Dental Arch ◽

Micro Computed Tomography ◽

Morphometric Measurement ◽

Before And After ◽

Repeatability And Reproducibility ◽

Lingual Brackets ◽

Multibracket Appliance ◽

Area And Volume

The aim of the present study is to present a repeatable, reproductible, and accurate morphometric measurement method for measuring and quantifying the area and volume of cement that remains after fixed lingual multibracket appliance debonding, enamel loss after fixed lingual multibracket appliance debonding, and the volume of cement used to adhere fixed lingual multibracket appliances. Ten conventional lingual brackets were cemented in 10 extracted teeth embedded into an epoxy resin model simulating a dental arch. This model was scanned before and after bonding the lingual brackets, after debonding, and after polishing the surfaces. We also performed a Micro-Computed Tomography scan of the lingual brackets used. Afterward, the standard tessellation language (STL) digital file was aligned, each tooth was segmented individually, and the file was re-aligned using engineer morphometry software. Inter-operator and intra-operator comparative analyses were performed using the ANOVA test, and the repeatability and reproducibility of the morphometric measurement technique were analyzed using Gage R&R statistical analysis. Repeatability showed 0.07% and 0.16% variability associated with the area and volume measures, respectively, while reproducibility showed 0.00% variability associated with the area and volume measures, respectively. In conclusion, the morphometric measurement technique is a repeatable, reproductible, and accurate morphometric measurement method for quantifying the area and volume of cement that remains after fixed lingual multibracket appliance debonding, enamel loss after fixed lingual multibracket appliance debonding, and the volume of cement used to adhere fixed lingual multibracket appliances.

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Does Presurgical Nasoalveolar Molding Have a Long-Term Effect on Nasal and Upper Airway Dimensions?

The Cleft Palate-Craniofacial Journal ◽

10.1177/1055665620980234 ◽

2020 ◽

pp. 105566562098023

Author(s):

Ashwina S. Banari ◽

Sanjeev Datana ◽

Shiv Shankar Agarwal ◽

Sujit Kumar Bhandari

Keyword(s):

Upper Airway ◽

P Value ◽

Airway Patency ◽

The Mean ◽

Group 2 ◽

Acoustic Pharyngometry ◽

Nasoalveolar Molding ◽

Area And Volume ◽

Group 1

Objectives: To compare nasal and upper airway dimensions in patients with cleft lip and palate (CLP) who underwent nasoalveolar molding (NAM) with those without NAM during infancy using acoustic pharyngometry and rhinometry. Materials and Methods: Eccovision acoustic pharyngometry and rhinometry (Sleep Group Solutions) was used for assessment of mean area and volume of nasal and upper airway in patients with complete unilateral CLP (age range 16-21 years) treated with NAM (group 1, n = 19) versus without NAM (group 2, n = 22). Results: The mean nasal cross-sectional areas and volume were higher in group 1 compared to group 2 on both cleft ( P value <.001) and noncleft side ( P value >.05). The mean area and volume of upper airway were also significantly higher in group 1 compared to group 2 ( P value <.05). Conclusions: Nasoalveolar molding being one of the first interventions in chronology of treatment of patients with CLP, its long-term outcome on nasal and upper airway patency needs to be ascertained. The results of the present study show that the patients with CLP who have undergone NAM during infancy have better improvement in nasal and upper airway patency compared with those who had not undergone NAM procedure. The basic advantages of being noninvasive, nonionizing and providing dynamic assessment of nasal and upper airway patency make acoustic pharyngometry and rhinometry a diagnostic tool of choice to be used in patients with CLP.

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Variations in water level, area and volume of Hongze Lake, China from 2003 to 2018

Journal of Great Lakes Research ◽

10.1016/j.jglr.2020.08.024 ◽

2020 ◽

Vol 46 (6) ◽

pp. 1511-1520

Author(s):

Yu Cai ◽

Chang-Qing Ke ◽

Xiaoyi Shen

Keyword(s):

Water Level ◽

Hongze Lake ◽

Area And Volume

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