Tạp chí Khoa học - Trường Đại học Sư phạm Hà Nội: Khoa học Tự nhiên

ROBUST STABILIZATION OF UNCERTAIN DISCRETE-TIME STOCHASTIC BILINEAR SYSTEMS WITH MARKOVIAN SWITCHINGS

Nguyen Trung Dung — Fri, 06 Jun 2025 03:30:43 +0700

In this paper, the problem of robust stabilization is addressed for a class of uncertain discrete-time stochastic bilinear systems with Markovian switchings. The parameter uncertainties are assumed to be time-varying and norm-bounded. The jumping process is driven by a discrete-time Markov chain with finite states and its transition probability matrix is partially unknown. Sufficient conditions are established in terms of tractable linear matrix inequalities to ensure the closed-loop system is robustly stochastically stable.

CONFIDENCE INTERVAL OF LIFE EXPECTANCY ESTIMATE

Nguyen Thanh Nga, Ho Dang Phuc — Fri, 06 Jun 2025 03:33:48 +0700

Concerning the local parametric estimation method, a novel method of life expectancy estimation, the article uses the bootstrap method to evaluate this method in extensive experiments with real-world datasets. The obtained results show that the local parameter method provides the narrower confidence intervals in comparison to the Chiang method. This provides the statistical tests to get higher performance in the detection of life expectancy estimate differences

MOLECULAR DYNAMICS SIMULATION OF THE DIFFUSION PROCESS OF SODIUM ATOMS IN Na2O.3SiO2 AND Na2O.4SiO2 SYSTEMS

Nguyen Thi Thao, Pham Thi Lien — Fri, 06 Jun 2025 03:35:05 +0700

The Na2O.3SiO2 and Na2O.4SiO2 materials have been investigated in the range of temperatures from 973 K to 1573 K by using molecular dynamics simulations. The diffusion behaviors of sodium atoms in a fixed Si-O network have been assessed by analyzing both the mean square displacement of sodium atoms and the number of O coordination of sodium atoms. The results show that the diffusion behavior of sodium atoms is governed by the rate of change in their oxygen coordination number. This dependence is described by a quadratic equation, applicable to all samples considered at various temperatures and SiO2 content.

PRODUCTION OF SAXION AT e e + − COLLIDER VIA VECTOR UNPARTICLE EXCHANGE IN THE SUPERSYMMETRY AXION MODEL

Le Nhu Thuc, Dao Thi Le Thuy — Fri, 06 Jun 2025 03:36:26 +0700

The dynamics of vector unparticle behavior within a supersymmetric axion model have been thoroughly examined, with a focus on their impact on saxion production. Our investigation involved a comprehensive analysis, encompassing the computation of vector unparticle exchange contributions to the cross-section (CS) and evaluating the dependence of the differential cross-section (DCS) on the scattering angle ( ) . These calculations, in turn, allowed us to determine the production rates of both saxions and vector unparticles in the e e + − collider, both in s- and t-channels such as the distribution of missing energy. The results have been plotted in the energy ranges currently used in accelerator designs and for the near-future energy upgrades of the International Linear Collider (ILC) and the Compact Linear Collider (CLIC).

MULTI-ELEMENT UNIT CELL METAMATERIAL ABSORBER FOR THE GHz FREQUENCY APPLICATIONS

Fri, 06 Jun 2025 03:46:07 +0700

In this paper, we used Computational Simulation Technology CST (2017) software to design and identify a perfect absorber material for metamaterial type (MMA), aiming for optimal absorption of electromagnetic waves in the GHz frequency band. By changing the size parameters of the constituent materials onto MMA, we achieved optimum structure with good absorption in the frequency range of 23.1 to 25.2 GHz and an absolute in the narrow band from 23.3 to 23.7 GHz. These findings are of significant importance in finding novel structural characteristics of MMA materials that exhibit complete absorption of electromagnetic waves within the K band frequency range (18-27 GHz). The optimal material after the investigation has great potential applications in absorbing electromagnetic waves, especially in devices such as military and aerospace radars, and in satellite communication systems that operate within the 18 to 80 GHz frequency region.

SPECTRAL SHAPE PARAMETERS OF SOME NITROGEN BROADENED METHANE TRANSITIONS AT ROOM TEMPERATURE USING THE SPEED DEPENDENCE-AND DICKE NARROWING-MODELS

Nguyen Thi Huyen Trang, Le Cong Tuong — Fri, 06 Jun 2025 03:47:11 +0700

In this work, spectral shape parameters of some isolated transitions in the infrared region of methane diluted in nitrogen at room temperature are obtained using two refined line-shape models including the Rautian and the speed dependent Voigt profiles as well as the simple Voigt one. The measured absorption spectra at large pressure ranges were one-by-one fitted with these models using the least-squares method. The obtained result reconfirmed that non-Voigt effects must be taken into account to get a better fit residual and fit quality. Pressure dependence of the Dicke narrowing parameter and the speed dependent components of line width and shift were also obviously observed. The obtained line shape parameters are in good agreement with the literature.

DETERMINATION OF RADON CONCENTRATION BY USING CR-39 TRACK DETECTOR IN BINH PHUOC

Bui Ngoc Ha, Nguyen Van Hieu, Tran Thuy Duong, Nguyen Thi Hoai — Fri, 06 Jun 2025 03:48:29 +0700

Natural radiation is one of the important environmental quality indicators, receiving special attention from society because of the effects of radiation on the human body. Radon and its decay daughters are considered the leading cause of lung cancer, especially in environments such as caves, underground mines, and homes with poor air convection. This paper presents the results of surveying radon concentrations in the air at several locations in Binh Phuoc province using CR-39 trace detectors. The results indicate that the indoor radon levels are low, with average values in the range of 5–119 Bq/m3. Indoor radon surveys show that the distribution of radon concentrations in dwellings is approximately log-normal. Our result will be the basis for assessing the level of radioactive hazards in the environment in Binh Phuoc province and will also add to the data set on radon concentration in Vietnam.

SYNTHESIS AND CHARACTERIZATION OF CHITOSAN/CARRAGEENAN/POLYANILINE-BASED BIOCOMPOSITE AS LOVASTATIN CARRIER AND ITS DRUG RELEASE ABILITY IN BUFFER SOLUTIONS

Fri, 06 Jun 2025 03:49:08 +0700

In this study, Chitosan/Carrageenan/Lovastatin/Polyaniline biocomposites (CsCLP) with different polyaniline (PANi) concentrations (0-10%) were successfully synthesized via the solution blending method. The chemical structure, morphology, and thermal properties of lovastatin-carried biocomposites were characterized by Fourier Transform Infrared (FTIR) spectroscopy, Field emission scanning electron microscope (FESEM), and Differential Scanning Calorimetry (DSC). The results revealed that among the CsCLP biocomposites synthesized, the sample CsCLP1955 with 5% wt. of PANi possessed the best dispersion of lovastatin (with the smallest particle size) in the composites. It also showed the smallest melting point (164.8oC) and the most uniform morphology. The ability of biocomposites to release lovastatin in buffer solutions was investigated by UV-Vis spectroscopy analysis. It was found that this ability increased with the presence and the content of PANi in the composites. In the pH 2.0 buffer solution, the released lovastatin content reached 61.7 - 74.3% after 30 hours of testing, whereas in the pH 7.4 buffer, it was slightly better, at 68.5 - 78.1%, with the optimized ratio of PANi of 5% wt.

SYNTHESIS AND CHARACTERIZATION OF SEVEN-MEMBERED β-KETO ESTERS AS BUILDING BLOCKS TOWARDS ERVATAMINE SYNTHESIS

Vo Ngoc Binh, Cho Cheon-Gyu, Ngo Quoc Anh — Fri, 06 Jun 2025 03:49:49 +0700

In this paper, seven-membered β-keto esters were synthesized as initial building blocks for the formation of the C ring and methoxycarbonyl group at C-16 of ervatamine molecule through ring extension process and α-hydroxymethylation of 1,4-dioxaspiro[4.5]decan-8-one. Their structures and properties were determined based on 1H NMR, 13C NMR, HSQC, HRMS spectra, and optical rotation measurement.

DETERMINING SOME NUTRITIONAL INDICATORS AND COLOUR OF BANANA (Artocarpus integer) POWDER

Nguyen Van Loi, Do Thi Hanh — Fri, 06 Jun 2025 03:50:23 +0700

In Vietnam, banana trees are grown in all localities throughout the country, especially Ha Giang, Lai Chau, Tuyen Quang, Phu Tho, Hung Yen, and Hai Duong provinces, with large areas and outputs. Therefore, the goal of this study is to determine some nutritional indicators and colour of banana powder, to serve as a scientific basis for the application of banana powder in food processing. The Hai Duong banana powder sample has the highest colour indicator of 2.89, followed by the Hung Yen banana powder sample with a colour indicator of 2.85. The Phu Tho banana powder sample has a colour indicator of 2.43, the Tuyen Quang banana powder is 2.35 and the lowest is the Ha Giang banana powder sample with a colour indicator of 2.27. Banana trees grown in Hai Duong and Hung Yen provinces on fertile alluvial soil in the Red River Delta have a higher soluble dry matter content, total sugar content, total protein content, and vitamin A content than banana trees grown on hillside land in Phu Tho, Tuyen Quang, and Ha Giang provinces.

PRELIMINARY STUDY ON ACTIVITY BUDGET OF THE RING-TAILED LEMUR (Lemur catta) AT HANOI ZOO IN WET WEATHER

Vu Tra My, Nguyen Vinh Thanh — Fri, 06 Jun 2025 03:51:06 +0700

The activity budget of ring-tailed lemur (Lemur catta) during the wet spring in Northern Vietnam was studied based on 4 lemur individuals at Hanoi Zoo from March to April 2021 with a total of 23 observation days. Generically, the lemurs spent most time resting (48%), moving (19%), feeding (16%), less for vigilance (8%), intra-specific interactions (5%), grooming (2%), and playing (2%). No weird behavior has been found. There was no statistically significant difference between the proportion of time spent on the behaviors of this study and the results of Caselli et al. (2022) through the Chi-squared test (X-squared = 30, df = 25, p-value = 0.2243). However, it seems that the animals need more space to move and avoid conflict between individuals because the time spent on resting, vigilance, and intra-specific interactions was slightly high.

PRIMATE POPULATION DENSITY AND SIZES IN BAC SON DISTRICT, LANG SON PROVINCE

Fri, 06 Jun 2025 03:51:41 +0700

Primate species composition has been surveyed in Bac Son district, Lang Son province, but no study has provided an estimation of the primate densities. Our research was conducted in 32 days, in September-October 2018 using line transects for 21 days and 11 nights. In Bac Son district, 03 primate species have been recorded including Bengal Slow Loris (Nycticebus bengalensis) with a density of about 0.02 individuals/ha, a population size estimated at 673 individuals, Rhesus Monkey (Macaca mulatta) with a density of about 0.03 individuals/ha and estimated population size of about 1010 individuals, and the Assamese Macaque’s (Macaca assamensis). Information on Macaca assamensis was only obtained from interviews and that was estimated of more than 12 individuals. Primate species were only found in secondary forests on rocky mountains, but not in soil mountainous areas, possibly due to higher hunting pressure.

LENGTH-WEIGHT RELATIONSHIP, SEXUAL DIMORPHISM, AND CONDITION FACTOR OF FRESHWATER SLEEPER Sineleotris namxamensis (ODONTOBUTIDAE) IN NORTHERN VIETNAM

Nguyen Quang Huy, Ta Thi Thuy — Fri, 06 Jun 2025 03:52:22 +0700

Sineleotris namxamensis Chen & Kottelat, 2004 is a species of the family Odontobutidae distributed in freshwater streams. The information on morphological characteristics, sexual dimorphism, length-weight relationships, and condition factors for this freshwater sleeper have been described based on samples collected in Northern Vietnam. The specimens were identified at the species level based on morphometrics combined with the fin, scale counts, and the head lateral line system. To distinguish between both sexes in this species, five morphometric characteristics such as snout to 2nd dorsal fin origin, snout to anus, eye diameter, pelvic-fin length, and pelvic fin origin to anus have been used. The b was higher than the isometric value of 3 indicating in both sexes (3.457 for females, 3.439 for males, and 3.443 for all), and this species revealed a positive allometric growth through the length-weight relationships, which was found to be highly significant. For the first time, the obtained K values and the LWR for this species revealed no significant variation between males and females. The fish community where this goby lives shows that there was little evidence of species competition, allowing it to grow well. These findings provide essential information for resource exploitation and conservation of this species in nature.

AN ANALYSIS OF ADVERTISEMENT SONGS OF Hyalessa maculaticollis (HEMIPTERA: CICADIDAE)

Nguyen Quynh Hoa, Sungmin Ji, Jaeyeon Kang, Vy Thi Ha My, Yikweon Jang — Fri, 06 Jun 2025 03:53:03 +0700

Advertisement songs play the critical role of a prezygotic reproductive isolation mechanism. Specifically, female cicadas rely on the fluctuation of spectral and temporal properties of males’ songs for species recognition and pair formation. However, the structure of the advertisement song is often arbitrarily determined without proper delimitation criteria. Here, a new method for analyzing song structure was proposed which relied on fluctuation of spectral properties. First, time series of peak frequency and amplitude envelope were obtained from recorded songs. Then, a simple linear regression model based on those two time-series was tested for consistency of regression coefficients. This method was applied in analyzing advertisement songs of Hyalessa maculaticollis, a common cicada species whose advertisement songs contain multiple modulations in spectral properties in East Asia. Males of H. maculaticollis produced songs in separate phrases in which one phrase was equivalent to one complete song and they also changed their calling perches from tree to tree in between songs. One phrase of H. maculaticollis was divided into four main parts, in which the first two parts were repeated alternatively and the last two were produced once at the end. The proposed method suggests an effective objective way of analyzing acoustic characteristics of songs, especially for those animals with complex structures.

THE STUDY ON SPECIES COMPOSITION OF MAYFLIES (EPHEMEROPTERA: INSECTA) IN TAM DAO DISTRICT VINH PHUC PROVINCE

Nguyen Van Hieu, Nguyen Van Vinh — Fri, 06 Jun 2025 03:53:36 +0700

Based on a field survey in December 2021, the present study has recorded 45 species, 28 genera, and 8 families of mayflies in Tam Dao district, Vinh Phuc province. Dominant families included Baetidae and Heptageniidae with 15 and 13 species, respectively. Other families, Caenidae, Ephemerellidae, Ephemeridae, Leptophlebiidae, Polymitarcyidae, and Teloganodidae were found with 1-6 species. Two species Polyplocia orientalis Nguyen & Bae 2003 and Teloganodes tristis (Hagen, 1858) were new records of the Mayfly fauna of the Tam Dao district. This study also provides data on the level of similarity in species composition and biodiversity index between study areas.

DATA ON SPECIES COMPOSITION OF STONEFLIES IN THE FAMILY NEMOURIDAE AND PERLIDAE (PLECOPTERA: INSECTA) IN TAM DAO NATIONAL PARK, VINH PHUC PROVINCE

Nguyen Van Hieu, Cao Thi Kim Thu — Fri, 06 Jun 2025 03:54:10 +0700

Research on the fauna of stoneflies the family Nemouridae and Perlidae in Tam Dao National Park, Vinh Phuc province was conducted quite early. However, records of these groups were published in scattered papers. The results from this article for the first time provide the most updated and complete data on the composition of stoneflies in the family Nemouridae and Perlidae in Tam Dao National Park, Vinh Phuc province. The results show that, up to the time of publication, 6 species of the family Nemouridae belonging to 3 genera and 25 species of the family Perlidae belonging to 10 genera have been recorded in Tam Dao National Park, Vinh Phuc province. In this study, Nemoura apicalis Sivec & Stark, 2010 was a new record for Tam Dao National Park. Among the 31 species of stoneflies collected, 22 species are endemic to Vietnam, and 11 are endemic to the study area. In particular, Phanoperla sp. may be a new species to science. Now, the specimens of this species have only been found in Tam Dao National Park, Vinh Phuc province. The quantitative comparison of stonefly communities between riffle and pool habitats showed that the average number of species and the average number of individuals in riffle habitats were higher than in pool habitats (α = 0.05)

EFFECTS OF CULTURE CONDITIONS ON GROWTH AND PROTEASE PRODUCTION BY Virgibacillus STRAIN T1.6 ISOLATED FROM SHRIMP PASTE

Doan Van Thuoc, Khuat Thi Mai, Nguyen Van Quyet — Fri, 06 Jun 2025 03:54:50 +0700

A protease producing bacterium strain T1.6 isolated from shrimp paste was investigated in this study. The strain T1.6 was a Gram-positive, aerobic, spore forming, and rod-shaped bacterium. The analysis of 16S rRNA sequences demonstrated that this strain belonged to the genus Virgibacillus. The effect of culture conditions such as NaCl concentration, pH, and temperature on growth and protease production through shake-flask culture was investigated. Maximum protease activity of 83 IU/mL was obtained after 36 h of cultivation in LB medium containing 2.5% NaCl at 30 oC and pH 7.0. The protease activity obtained in this study by strain Virgibacillus sp. T1.6 was higher than that obtained by other Virgibacillus species isolated from shrimp paste. Bacterial strain Virgibacillus sp. T1.6 could be a potential producer for the industrial production of protease.

IDENTIFICATION, ANNOTATION AND CHARACTERIZATION OF THE TREHALOSE-6-PHOSPHATE SYNTHASE IN CASSAVA (Manihot esculenta)

Fri, 06 Jun 2025 03:55:49 +0700

The trehalose-6-phosphate synthase (TPS) proteins have been characterized to play an important role in numerous biological processes during the growth and development of plants. However, a comprehensive analysis of this important gene family is lacking for cassava (Manihot esculenta). The objective of this current study is to identify, annotate, and characterize the TPS genes (MeTPS) in cassava. A total of 12 MeTPS genes were identified in the cassava assembly. They were assigned to two different groups based on phylogeny. Our analyses indicated that these proteins shared slightly similar general features. Of our interest, the MeTPS genes exhibited divergent expression in major organs in cassava plants. Among them, MeTPS10 was noted to exhibit a high expression in fibrous root, lateral bud, petiole, and stem, while MeTPS11 was exclusively expressed in storage root tissues and strongly expressed in fibrous root and lateral bud tissues. Taken together, our study could provide a list of candidate MeTPS genes for further functional characterization.

STUDY ON PHYSIOLOGICAL AND BIOCHEMICAL PARAMETERS OF SACHA INCHI LEAF (Plukenetia volubilis L.) AND THE PROCESS OF MAKING TEA BAGS IN VIETNAM

Bui Viet Ha, Nguyen Thi Anh Sao, Tran Khanh Van — Fri, 06 Jun 2025 03:57:06 +0700

The study consists of two experiments, the first one aims to determine the number of growth and physiological parameters of sacha inchi leaves (content of tannins, reducing sugars, minerals) to provide a basis for choosing leaf type (according to age) for the second experiment: a study on the effect of temperature and drying time on the perceived results of tea bags made from sacha inchi leaves as well as to find out the mixing ratio between sacha inchi leaf combined with licorice and pandan leaves to make a tea bag which has good sensory quality and quality in the tests. The main experimental methods used in this study were: Determination of the total chlorophyll content in sacha inchi leaves by using handheld chlorophyll meter; The dry weight of leaf samples was determined based on the dry weight after drying at 105oC for 1 day 1 night by analytical balance; The content of tannins in the leaves by leventhal method also was measured; Minerals such as Mg, Ca and K were determined by wetting of leaf samples and measured with an AAS atomic absorption spectrometer. The factors affecting the quality and sensory of tea bags such as temperature tea drying time, and mixing ratio of sacha inchi: licorice: pandan leaves were also investigated. A study on the extraction time of tea solution for phenolic content and oxidation activity of finished tea product was also carried out. The results showed the highest concentration of tannins in old leaves (2.47 ± 0.02 % by dry weight) and lowest in young leaves (2.17 ± 0.02 % by dry weight), the highest concentration of reducing sugars in mature leaves (25.9 ± 5.67 mg/g). The concentration of mobile minerals such as Mg, and K was highest in young leaves (0.75 ± 0.04 and 33.62 ± 0.98 mg/kg, respectively) and lowest in old leaves (0.61 ± 0.01 and 29.41 ± 0.12 mg/kg, respectively) while non-mobile minerals as Ca were highest in old leaves (32.59 ± 0.16 mg/kg) and lowest in young leaves (28.27 ± 1.02 mg/kg). The phenolic content was highest and the antioxidant capacity SC50 was lowest in a 5-minute tea extract solution (126.2a ± 8.9 mg gallic acid/1g and 4.34 ± 0.5 mg/ml. The tea treatment with the highest sensory survey results was the mature leaf sample, which was dried at 130℃ for 1 hour, with a mixing ratio of sacha inchi leaves: licorice leaves: pandan leaves of 1.6/0.4/0.2 for tea packages with a dry weight of 2.2 g/bag and extract the tea bag in hot water in 5 minutes is our recommendation.

PREVALENCE AND ASSOCIATION OF EATING BEHAVIORS WITH OVERWEIGHT AND OBESITY AMONG STUDENTS AGED 11 - 15 AT NGUYEN TAT THANH MIDDLE AND HIGH SCHOOL, HANOI CITY

Nguyen Thi Hong Hanh, Nguyen Dao Anh Thu, Nguyen Duong Anh Hong — Fri, 06 Jun 2025 03:57:55 +0700

This study aimed to assess the prevalence of overweight and obesity among students at Nguyen Tat Thanh Middle and High School in Hanoi and explore the association of these conditions with eating behaviors. The research included a cross-sectional study involving 1,136 students aged 11 to 15 and a case-control study comparing overweight/obese students (n = 109) and normal-weight students (n = 341). Eating patterns were evaluated using the Child Eating Behavior Questionnaire (CEBQ), and nutritional status was determined according to the World Health Organization (WHO) and International Obesity Task Force (IOTF) criteria. The study revealed alarming rates of overweight (28.5%) and obesity (7.8%) among the students, with a higher prevalence among boys. Overweight/obese students scored significantly higher on CEBQ subscales related to Food Responsiveness (FR), Emotional Overeating (EOE), and Desire for Drinks (DD), while scoring lower in Satiety Responsiveness (SR). Linear regression analysis demonstrated that higher scores on FR, EOE, and DD were associated with a 1.59 to 1.69 times higher risk of overweight/obesity, while a higher SR score was associated with a reduced risk (OR = 0.61; β = -0.5; P = 0.009). The study highlights a high prevalence of overweight and obesity among students at Nguyen Tat Thanh Middle and High School and a strong association between eating behaviors and these conditions. These findings offer valuable insights into the intricate interplay between eating behaviors and weight status, emphasizing the promotion of healthy dietary habits among adolescents.

QUALITY OF LIFE OF STUDENTS AT HANOI NATIONAL UNIVERSITY OF EDUCATION DURING COVID-19 PANDEMIC IN 2022 AND SOME RISK FACTORS

Fri, 06 Jun 2025 03:59:54 +0700

The COVID-19 pandemic has become a global threat and is a pressing concern for community health. This research using the SF-36 questionnaire aimed to assess the current state of quality of life among 542 students at Hanoi National University of Education. The study results showed that the majority of students' quality of life was at medium level (43%), meanwhile, at low level and high level is 28.6% and 27.5%, respectively, and lastly, at very low level is a minor percentage, only 0.9%. Most students had both physical and mental component summaries at medium to high levels (55.2%). However, it was concerning that nearly 19.9% of students with low to very low levels of physical and mental component summary. The research results showed the associations between some demographic characteristics such as age, ethnicity, nutrition status, years of study, living area, cohabitant, having a chronic disease, being infected with COVID-19, complications after COVID-19, night sleep time to the physical component summary, mental component summary, and quality of life.

ASSESSMENT OF METEOROLOGICAL DROUGHT IN THANH HOA PROVINCE

Fri, 06 Jun 2025 04:00:54 +0700

The drought degree at Thanh Hoa province was assessed through drought index K and monthly drought frequency. According to the climate averages, the annual mean drought index K<1 represents that the region is humid for the whole year. However, in terms of the drought degree, during the winter period (from November to February of the following year), this is a drought period throughout the study area with a K value ranging from 1 to 3.9 with 2 classes: mild drought, and moderate drought. The extreme drought years often coincide with the years of strong El Niño. The drought regionalization for Thanh Hoa province was built based on statistical processing of drought degree for each meteorological station in the area, and criteria for determining drought seasons and the number of months with significant drought frequency ≥ 30%. The results divided Thanh Hoa province's territory into 3 drought classes: mild drought, moderate drought, and extreme drought. The results of the assessment of meteorological drought in the Thanh Hoa province are the scientific basis for the arrangement and conversion of crop structure in agricultural production and making an important contribution to the prevention and mitigation of drought hazards.

THE SOFTWARE SUPPORTING SEMI-QUANTITATIVE SOIL CLASSIFICATION OF VIETNAM

Nguyen Thanh Tuan, Ngo Dang Tri — Fri, 06 Jun 2025 04:01:33 +0700

Soil classification is essential in mapping soils, land evaluation, and sustainable soil usage. Nowadays, along with the Industrial Revolution 4.0, there is an interest in the development and promotion of information technology in classifying soils. This paper aims to introduce the software supporting soil classification of Vietnam (ICSM) according to the semi-quantitative soil classification system of Vietnam and to apply it to classify the BTGD-06 soil profile as a pilot example. It consists of three main components: (1) Menu and toolbars, (2) Tabs to input data, and (3) suggesting and identifying blocks. It was also applied successfully to classify five soil profiles in Vietnam and illustrated by classifying the soil profile BTGD-06. The results of the trial classification are the same as those published in the Journal of Vietnam soil science about the diagnostic horizons, soil group, soil type, soil subtype, and soil variety. The algorithms used in developing the software can be used to write other quantitative soil classification software worldwide.