Coefficient of determination
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Vietnam is located in a strong earthquake zone with many areas having a ground acceleration (ag) of greater than 0.08 g (TCVN 9386:2012). The article introduces a method to determine the attenuation coefficients according to the standard TCVN 10304:2014.
9p viwalton 02-07-2024 1 1 Download
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The swine farming has a significant potential for biogas emissions and is a substantial contributor to greenhouse gas emissions within Vietnam's agricultural sector. This study was conducted to determine the total amount of CH4, and CO2 (eq) released from mature management activities and emission coefficients of CH4 and CO2 (eq) at different swine farms in Northern, Central and Southern regions, using tier 1 and tier 2 according to IPCC method.
8p visergeyne 18-06-2024 11 0 Download
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Research findings have demonstrated a statistically significant negative correlation between profitability, growth, and liquidity and the capital structure measured by the debt ratio. Although it also decreases with non-debt tax shields, this variable does not have statistical meaning with the dependent variable. Size is the only variable with a positive correlation coefficient, but no statistical significance was found either. The results of the study can help these firms build a reasonable capital structure to enhance their intrinsic value.
15p leminhvu111 07-06-2024 1 0 Download
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In this paper, the author proposes a new approach (method) to design the pile raft foundation to optimize the number of piles required and suit the geology for each specific building. In which the first the required minimum number of piles with a given safety coefficient (of the pile) is determined then simulates (digitizes) the interaction of pile raft foundation with the ground by the finite element method (FEM) to design the foundation with different load options.
10p dathienlang1012 03-05-2024 2 0 Download
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In the case of length weight relationship (LWR), the coefficient of determination value (r2 ) was found 0.96 and the slope was found b = 1.50 which indicated the pattern of negative allometric growth of this species as b < 3. In contrast, an increase was recorded in the fecundity associated with the rise of total length, body weight and gonad weight showed a significant linear relationship. This study would assist in the development of induced breeding techniques and provide valuable information for the sustainable management of this population in the inland open ecosystem.
11p dianmotminh02 03-05-2024 3 1 Download
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This paper presents the results and assessment of the groundwater exploitation reserves in coastal areas of Ninh Thuan province. The research was based on determining the exploitation reserves of all grid cells with dimensions 500 m × 500 m distributed in fresh-salted water areas of the Holocene (qh) and Pleistocene (qp) aquifers. Each grid was assigned the corrected hydrogeological parameter values (depth, gravity coefficient, hydraulic conductivity, and drawdown level).
15p dianmotminh02 03-05-2024 7 2 Download
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In article "Forecast of submarine landslides related to the reactive probability of the fault system in the Southeast Vietnam continental shelf and adjacent areas" the fault’s geometrical parameters in the Southeast Vietnam continental shelf and adjacent areas (such as the location, dip angle and strike angle as well as depth and length) are determined by gravity, seismic data and regional stress fields. For the faults, due to their high internal frictional coefficient, they accumulate more energy under the impact of the regional stress field.
9p tukhauquantuong1011 22-04-2024 3 2 Download
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The settlement was measured with 24 hour-period for each increment and based on which, consolidation characteristics including the time to the end of primary consolidation (EOP) determined by Log Time method and 3-t method and then, the coefficient of secondary consolidation were observed for both undisturbed and disturbed specimens.
10p visystrom 22-11-2023 7 3 Download
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This paper develops an Artificial Neural Network (ANN) model based on 96 experimental data to forecast the dynamic modulus of asphalt concrete mixtures. The accuracy of the models was assessed using numerous performance indexes such as the Root Mean Square Error (RMSE), Mean Absolute Error (MAE), Mean Absolute Percentage Error (MAPE), and coefficient of determination (R2).
10p visharma 20-10-2023 3 3 Download
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This paper presents the results of determining the coefficient of friction when cold plastic deformation by the method of cold ring upsetting with different lubricants. The ring upsetting process is performed with varying degrees of deformation with three lubricants used: industrial oil, cooking oil, and zinc sulfate powder. Based on the deformation and dimension change of the samples after the upsetting, the coefficient of friction was determined by correlation comparison with the friction calibration curve performed by Male and Cockcroft.
9p giangnhanly 02-10-2023 8 3 Download
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We evaluated the digestibility of plant oils and their influence on the growth of and fatty acid composition in common carp. Apparent digestibility coefficients (ADC) of lipids were determined in carp (200.2 ± 40.0g) fed with cod liver oil (CLO), linseed oil (LO), sunflower oil (SFO), or sesame oil (SO).
14p viengels 25-08-2023 7 2 Download
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This article presents an improved procedure for detecting single damage in beam-like structures. Many damage detection methods are based on the analysis of beam natural frequency shifts in damaged and intact states and its analytical modal curvatures. They identify the damage by constructing curves of damage coefficients along the beam and visually determining the point of their mutual intersection.
15p viberkshire 09-08-2023 4 3 Download
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The electric and magnetic properties of a lithium ferrite (LF) synthesized using the solid state reaction technique have been reported. The XRD studies reveal the cubic nature, from which the crystallite size and the lattice constant are determined to be 16.84 nm and 2.847 Å repectively. The FESEM confirms the coarseness in the samples with a low porosity.
6p viberbers 09-08-2023 6 3 Download
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This study analyzes the quarter car braking model to determine the effect of the wheel slip ratio (λ) on the friction coefficient (µ) during the braking of the car. The results of braking distance, deceleration, and brake pressure are considered and analyzed to select a suitable braking system for the operating conditions of the designed truck.
7p viwhitewolf 11-07-2023 5 4 Download
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This study focuses on monitoring the variation of surface soil moisture (0- 1 cm) and ground soil moisture (0÷1 m) in the soil in Dak Nong province using Sentinel-1 radar images received in December 2017. Active radar signals utilized in this method were sent and received using short wave pulses. The intensity of the received signal is compared to determine the scattering coefficient of the surface.
8p viwolverine 07-07-2023 5 3 Download
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This study focuses on building a regression model in the series of land pricing for frontages and alleys in the C zone of the Nam Hoi An project, Thang Binh, Quang Nam. With the regression model of mass land valuation, the local authorities can determine land prices of any land plot accurately and quickly to create favorable conditions for users to determine their financial obligations and for land acquisition and site clearance.Quang Nam
15p vispiderman 15-06-2023 6 1 Download
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This paper proposes a method for determining the optimal coefficients of current controllers using Particle Swarm Optimization (PSO) algorithm. The proposed method does not require much time, strength, and experience of designers.
8p vidoctorstrange 06-05-2023 2 2 Download
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This history of antimicrobials is marked with impressive discoveries, the majority of which have their origin in natural products. However in this work, the antimicrobial activity of β- nitrostyrenes and related compounds of synthetic origin is reviewed and investigated with a particular focus on the influence of fluorine functionality. Various fluorinated β-methyl-β-nitrostyrene compounds were prepared, their minimum inhibition concentration in cultures of Gram positive, Gram negative and a fungus and their lipophilicity was determined.
133p runthenight05 01-03-2023 3 2 Download
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In this study, MCS is applied to compute the reliability of the nodes and the network under uncertain demand and roughness, and to determine how reliability is distributed among the various nodes of WDN, as well as assessing the reliability of the network as a series or parallel system. The effect of the resilience index on the nodal and network reliability is also assessed.
199p runthenight05 01-03-2023 7 2 Download
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This study aimed to identify the effects of safflower genotypes for individual and combined effects of PEG 6000 and NaCl stress imposed at early seed germination stages, determine correlation coefficients among traits of safflower genotypes under stress treatments, and interpret the interrelationship of treatments × safflower genotypes interaction by principal component analysis.
12p lyhuyenthu 31-01-2023 9 2 Download