04. Trường Đại học Khoa học tự nhiên (University of Science)
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Các bộ sưu tập số Luận văn Thạc sĩ, Luận án Tiến sĩ, Đề tài Báo cáo khoa học… của Thư viện Trường ĐH. Khoa học tự nhiên – ĐHQG-HCM được xây dựng nhằm hỗ trợ cho hoạt động giảng dạy và nghiên cứu của Nhà trường.
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Duyệt 04. Trường Đại học Khoa học tự nhiên (University of Science) theo Nhan đề
- Ấn phẩm10 lý do để internet không thể thay thế cho thư viện(VILASAL, 2004-05) Herring, Mark Y.
- Ấn phẩm28NM redundant sram design employing high tolerant process variation techniques(Trường Đại học Khoa học Tự nhiên, ĐHQG-HCM, 2013) Nguyễn, Đức Thiên Sơn; Bùi, Trọng Tú
- Ấn phẩm3D printing of phase change hydrogels(Viện Kỹ thuật Nhiệt đới, Viện Hàn lâm Khoa học và Công nghệ Việt Nam, 2026-02) Md Alal Hossain; Shajuyan Ahmed; Md Sabir Hossain; Khan Rajib HossainPhase change materials (PCM) can change from solid to liquid at a constant temperature, allowing them to retain more heat than other materials. 3D printing of PCM with hydrogels opens up new manufacturing possibilities by increasing productivity and functional diversity. This article reviews recent advances in phase change hydrogel 3D printing, focusing on metal-infused hydrogels, graphene-based, bio-based PCM, and chitosan-based materials. In particular, a new 3D printing method was developed, in which rheology was modulated using carbomers to produce a variety of functional hydrogels, including magnetic, dual-network, thermosensitive, and other types. Highly loaded PCM/cellulose nanofiber (CNF) ink and phase change organic hydrogel (PCOH) are new options for such encapsulation and thermal stability. This article discusses how hydrogels resemble the extracellular matrix and can be used in bioprinting to support basic biological processes. Despite all the progress, more research is needed to address issues such as the flexibility of PCM and achieving high energy storage density. This review article highlights how hydrogels and 3D printing can have a revolutionary impact. Future directions and potential applications in the field of flexible electronics, responsive drug delivery systems, and tissue engineering are covered in this article.
- Ấn phẩm50 years field oriented control of three phase ac drives in the practice - The state-of-the-art(Viện Hàn lâm Khoa học và Công nghệ Việt Nam, 2024-03) Nguyen, Phung QuangFrom DC motors (DCM) we know, it is possible to independently control the two currents of the flx and torque generating. Because the two DCM circuits are completely isolated, we obtain simple adjustment algorithms that require little computing time on the microprocessor. This paper aims to provide an overview of the development status of FOC in industrial practice. The content presented deals mainly with 3-phase induction motors.
- Tài liệu80 bài chuyên đề nghiệp vụ thông tin thư viện theo quan điểm đổi mới đã đăng trong BTĐT CLB Thư viện(VILASAL, 2000-11) VILASAL
- Ấn phẩmA balanced edge detector for aeromagnetic data(Viện Địa lý, Viện Hàn lâm Khoa học và Công nghệ Việt Nam, 2023-09) Vinicius, Theobaldo Jorge; Saulo, Pomponet Oliveira; Pham, Luan Thanh; Duong, Van HaoOne of the most significant challenges in interpreting magnetic data is to mitigate the influence of the magnetization direction in the shape of the anomalies, especially when reduction to the pole fails to position them over the sources. We propose a balanced high-order filter that has low sensitivity to the direction of the resultant magnetization. We consider an edge-detector filter based on directional analytic signals of the vertically-integrated anomaly field. To ensure that anomalies from shallow and deep sources are equalized, we balance this filter with the magnitude of its two-dimensional Hilbert transform. The proposed filter is tested using aeromagnetic data from Apiai Terrane, Southern Brazil. The enhanced map is highly correlated with the study area's NE-SW trend of geological structures. Our results highlight the importance of using the directional analytical signals, which help reduce the influence of the magnetization direction, and the balancing filters, for equalizing the signal of shallow and deep causative sources.
- Ấn phẩmA clinical, genetic, and treatment analysis of two Vietnamese patients with vitamin D-dependent rickets type 1A(Viện Công nghệ sinh học, Viện Hàn lâm Khoa học và Công nghệ Việt Nam, 2026-06) Tran, Thi Anh Thuong; Nguyen, Ngoc Lan; Vu, Chi Dung; Can, Thi Bich Ngoc; Nguyen, Thi Thuy Hong; Nguyen, Van Tung; Nguyen, Thi Kim Lien; Nguyen, Thanh HienThis study examined the clinical and genetic features of two unrelated Vietnamese families exhibiting the characteristic symptoms of vitamin D-dependent rickets type 1A (VDDR-1A). The affected patients presented with prominent skeletal deformities, severe hypocalcemia, and markedly elevated serum levels of alkaline phosphatase (ALP) and parathyroid hormone (PTH), despite having normal or elevated concentrations of 25-hydroxyvitamin D [25(OH)D]. Genetic analysis revealed a homozygous frameshift mutation (c.1319_1325dupCCCACCC; p.Phe443Profs*24) in both patients. This previously reported pathogenic variant follows an autosomal recessive inheritance pattern. In both families, the asymptomatic parents were confirmed to be heterozygous carriers, and the patients’ siblings carried the mutation in a heterozygous state but exhibited no clinical manifestations. This mutation appears to result in early-onset and severe skeletal abnormalities, consistent with the phenotype observed in our patients. Treatment with calcitriol led to significant clinical and biochemical improvement over time, including normalization of calcium and PTH levels and a reduction in skeletal symptoms. Continued follow-up has demonstrated sustained improvement, highlighting the efficacy of targeted therapy in genetically confirmed cases.
- Ấn phẩmA closed-form solution for a queueing model of energy efficient Ethernet links(Viện Công nghệ thông tin, Viện Hàn lâm Khoa học và Công nghệ Việt Nam, 2021-09) Do, Van Tien; Csaba, RotterTo save energy consumption of Ethernet switches, IEEE has standardized a new energyeffient operation for Ethernet links with a low-power state and transition mechanisms between the high-power state for transporting traff and the low-power state. In this paper, we propose a queueing model with the Markov Modulated Compound Poisson Process that is able to characterize backbone packet traffi We derive a closed-form solution for the stationary distribution of the proposed queueing model. We show that our model can capture an entire system where the transition times are constant.
- Ấn phẩmA colorimetric multiplex RPA approach for on-site dual monitoring of Vibrio parahaemolyticus and White Spot Syndrome Virus in Pacific Whiteleg shrimp(Tổng cục Khí tượng Thủy văn, 2024-06) Tran, Diem Hong; Giang, Vo Ngoc Truc; Phung, Thi Thu Huong; Bui, Le MinhWhite spot syndrome virus (WSSV) and Vibrio parahaemolyticus represent the most prevalent and serious pathogens in Viet Nam's shrimp industry, annually inflicting major production losses. With no existing therapeutic measures, timely and accurate diagnosis is imperative for curbing outbreaks and limiting economic impacts through isolation and culling protocols. However, conventional techniques like polymerase chain reaction (PCR) and quantitative PCR require advanced laboratory infrastructure that is incompatible with rapid on-site pathogen surveillance.
- Ấn phẩmA combined approach for sustainable use of mountainous agricultural land: land suitability evaluation and ecological economic model(Viện Địa lý, Viện Hàn lâm Khoa học và Công nghệ Việt Nam, 2022-12) Hoang, Thi Huyen Ngoc; Nguyen, Manh Ha; Bui, Quang DungIn the quest for poverty reduction, developing sustainable agriculture and stabilizing cultivation areas for specialty plants can be substantially improved by a new approach, which combines land suitability assessment and designs of ecological-economic models. The land suitability was assessed according to the FAO framework and the Vietnamese standard TCVN-8409:2012. The criteria were grouped in climate, topography, and soil physicochemical properties. The seven land utilization types selected for analysis included orange, banana, tea, turmeric, cinnamon, chinaberry, and chukrasia in mountainous regions of Thanh Hoa and Nghe An Provinces, Vietnam. The results showed that the most suitable lands (S1) for cultivating these crops were 169.916 ha for orange, 201.166 ha for banana, 107.636 ha for tea, 570,744 ha for turmeric, 233.987 ha for cinnamon, 633.306 ha for chinaberry, and 280.704 ha for chukrasia. Based on that foundation, the study designed three ecological models with economic efficiency and elaborated on six formations of the models. The analyses obtained from the research also allowed the proposal of six prioritized spaces for land use and environmental protection, which were illustrated on a 1:100,000 map of proposed agricultural land use. Therefore, this study provided a detailed and reliable approach for researchers and managers in agricultural land use planning. A proper procedure for the assessment of agricultural land in mountainous areas can be suggested from this research.
- Ấn phẩmA combined approach to damage indentification for bridge(Trường Đại học Khoa học Tự nhiên, ĐHQG-HCM, 2009) Phan, Phúc Doãn; Nguyễn, Văn Minh Mẫn
- Ấn phẩmA combined physical and logical matching model for contextual advertising(Trường Đại học Khoa học Tự nhiên, ĐHQG-HCM, 2013) Tạ, Anh Tuấn; Cao, Hoàng Trụ
- Ấn phẩmA comparative study of biodiversity of aquatic insects between tropical Vietnamese stream and temperate Korean stream(Trường Đại học Khoa học Tự nhiên, ĐHQG-HCM, 2001) Hoàng, Đức Huy; Bae, Yoen Jae
- Ấn phẩmA comparison of benzene-core PCF optical characteristics with hexagonal and circular lattices(Viện Kỹ thuật Nhiệt đới, Viện Hàn lâm Khoa học và Công nghệ Việt Nam, 2025-04) Le, Tran Bao Tran; Chu, Van LanhThis work compares the optical characteristics of benzene photonic crystal fiber with hexagonal lattice (H-PCF) and circular lattice (C-PCF). The difference in the radius between the rings is used to optimize effective area, nonlinearity, attenuation, and chromatic dispersion simultaneously. A series of numerical studies show that the effective mode area and attenuation are small for C-PCF and large for H-PCF geometries. That is the reason why the nonlinear coefficient of H-PCF is larger. Meanwhile, flat dispersion over a wide wavelength range is achieved mostly with H-PCFs in both dispersion modes. Our optimized fibers with near-zero flat dispersion, small loss, and large nonlinearity can enhance supercontinuum generation efficiency to generate a broad spectrum with high coherence.
- Ấn phẩmA comparison of meat quality between F1 and F2 pigs crossed by Vietnamese native wild boar and local pigs(Viện Sinh thái và Tài nguyên sinh vật, Viện Hàn lâm Khoa học và Công nghệ Việt Nam - Tên tạp chí: Academia Journal of Biology (Tạp chí Sinh học), 2025-12) Hoang, Nghia Son; Ho, Nguyen Quynh Chi; Le, Thanh LongThe hybrid wild boar has the advantages of both wild boar and domestic pig, including strong disease resistance, simplicity in captivity, low fat content meat while retaining tenderness and sweetness. This study assesses the meat quality from 8-month-old Vietnamese hybrid wild boars of the F1 and F2 generations. The research subjects are hybrids crossbreeding between the Vietnamese native wild boar with Mong Cai (WM pig) and local pigs in Dak Nong province (WDP pig). Evaluation criteria include carcass performance, pH, and sensory evaluation. The results showed that the hanging carcass ratio and carcass length in F2 hybrid wild boars were slightly higher than that in the F1 generation. Carcass yield in both F1 and F2 generations did not have a significant difference; however, the WM pigs showed a marginally higher carcass yield than the WDP pigs. Changes in pH were not significantly different between groups. WM pigs and WDP pigs exhibited a similarity in backfat thickness. Back skin thickness in group F2 was slightly elevated than F1. Sensory evaluations show that, although there is no difference in taste, F2 generation wild boar meat was gently juicier and more tender than F1 generation. These results indicate that the meat quality of the F2 pigs has not significantly altered from the F1 generation; in fact, several parameters, such as tenderness and juiciness, have slightly improved. This suggests that the F2 generation has maintained the same pork quality as the F1 generation.
- Ấn phẩmA COMPARISON OF THREE VARIANT CALLING PIPELINES USING SIMULATED DATA(Vietnam Academy of science and technology, 2021-06) Nguyen, Van Tung; Nguyen, Thi Kim Lien; Nguyen, Huy HoangAdvances in next generation sequencing allow us to do DNA sequencing rapidly at a relatively low cost. Multiple bioinformatics methods have been developed to identify genomic variants from whole genome or whole exome sequencing data. The development of better variant calling methodologies is limited by the difficulty of assessing the accuracy and completeness of a new method. Normally, computational methods can be benchmarked using simulated data which allows us to generate as much data as desired and under controlled scenarios. In this study, They compared three variant calling pipelines: Samtools/VarScan, Samtools/Bcftools, and Picard/GATK using two simulated datasets. The result showed a significant difference between the three pipelines in two cases. In Chromosome 6 dataset, GATK and Bcftools pipelines detected more than 90% of variants. Meanwhile, only 82.19% of mutations were detected by VarScan. In NA12878 datasets, the result showed GATK pipeline was more sensitive than Bcftools and Varscan pipeline. All pipelines showed a high Positive Predictive Value. Moreover, by a measure of run time, VarScan was the highest pipeline but GATK has an option for multithreading which is a way to make a program run faster. Therefore, GATK is more effective than Bcftools and Varscan to variant calling with a lower coverage dataset.
- Ấn phẩmA comprehensive review of rock dust for soil remineralization in sustainable agriculture and preliminary assessment of nutrient values in micronized porous basalt rock from Nghe An province, Viet Nam(Viện Kỹ thuật Nhiệt đới, Viện Hàn lâm Khoa học và Công nghệ Việt Nam, 2024-08) Nguyen, Khanh Son; Nguyen, Hoang Thien Khoi; Nguyen, Ngoc Tri Huynh; Nguyen, Vinh PhuocThis review delves into the utilization of rock powder as a mineral-derived fertilizer to support soil remineralization in the context of sustainable agriculture. Soil remineralization has emerged as a key strategy for ensuring long-term soil fertility and reducing the dependency on synthetic fertilizers. This review critically assesses the methodological approaches applied in various studies, taking into account factors such as local rock mineralogy, soil conditions, crop types, and nutrient uptake by plants.
- Ấn phẩmA comprehensive review of rock dust for soil remineralization in sustainable agriculture and reliminary assessment of nutrient values in micronized porous basalt rock from Nghe An province, Viet Nam(Viện Kỹ thuật Nhiệt đới, Viện Hàn lâm Khoa học và Công nghệ Việt Nam, 2025-11) Nguyen, Khanh Son; Nguyen, Hoang Thien Khoi; Nguyen, Ngoc Tri Huynh,; Nguyen, Vinh PhuocThis review examines the use of rock powder as a mineral-derived fertilizer to promote soil remineralization in sustainable agriculture. Soil remineralization has emerged as a key strategy for ensuring long-term soil fertility and reducing reliance on synthetic fertilizers. This review critically assesses the methodological approaches employed in various studies, considering factors such as local rock mineralogy, soil conditions, crop types, and plant nutrient uptake. The review encompasses methods such as nutrient value analysis, nutrient release rate assessment, and crop cultivation experiments conducted in both laboratory and field settings, as well as implications for soil remineralization. Additionally, we present findings from a preliminary study on the nutrient content of basalt rock from Nghe An Province, Vietnam. This investigation focuses on assessing the nutrient values in a specific porous basalt material processed into micro- and nanometer-sized particles using a high-energy ball mill, thereby enhancing the efficiency of nutrient release. The study employs various analytical techniques, including XRD, XRF, SEM/EDS, and ICP-MS, to quantify macro- and micro-nutrient compositions. While basalt rock samples may exhibit limitations in providing macronutrients (like K) compared to commercial azomite rock, they offer advantages in supplying secondary macronutrients (such as Ca). This analysis provides insights into the potential use of micronized basalt rock for soil remineralization.
- Ấn phẩmA configurable AHB bus compatible with AMBA standard version 2.0(Trường Đại học Khoa học Tự nhiên, ĐHQG-HCM, 2012) Phạm, Thanh Hùng; Hoàng, Trang
- Ấn phẩmA CONTRIBUTION TO THE TAXONOMIC KNOWLEDGE OF THE GENUS Thrinchostoma (Thrinchostoma s. str.) Saussure (Hymenoptera: Halictidae) FROM VIETNAM, WITH NEW RECORDS OF THREE SPECIES AND A KEY TO SPECIES(Viện Hàn lâm Khoa học và Công nghệ Việt Nam, 2023-03) Tran, Thi Ngat; Dang, Thi Hoa; Nguyen, Thi Phuong Lien; Phan, Thi Giang; Truong, Thanh TrucFour species of the little-known bee genus Thrinchostoma Saussure, 1890 from Vietnam are presented including Thrinchostoma (Thinchostoma s. str.) tonkinense Blüthgen, 1926 and three new records: T. (T.) flaviscapus Bülthgen, 1926; T. (T.) sladeni Cockerell, 1913; and T. (T.) yunnanense Niu & Zhu, 2016. The occurrence of T. (T.) tonkinense Blüthgen, 1926 in Vietnam is confirmed. A key to species and distribution map of four species of the genus Thrinchostoma are also provided for Vietnam.
- Ấn phẩmA COTS product selection framework based on an adaptive process(Trường Đại học Khoa học Tự nhiên, ĐHQG-HCM, 2013) Nguyễn, Hoàng Anh; Nguyễn, Ngọc Trường Huy
- Ấn phẩmA critical review on factors affecting the two-stage anaerobic digestion of biodegradable solid waste(Viện Kỹ thuật Nhiệt đới, Viện Hàn lâm Khoa học và Công nghệ Việt Nam, 2025-04) Pham, Van Dinh; Le, Tho Bach; Pham, Van Toi; Do, Van Manh; Tran, Thanh LiemAnaerobic digestion (AD) technology has attracted considerable attention from the scientific community and has become a crucial component of sustainable solid waste management systems. It is the only biotechnological process capable of converting highmoisture biomass waste into energy through a series of biochemical steps, including hydrolysis, acidogenesis, acetate production, and methane generation. Notably, the two-stage anaerobic digestion (TAD) process, which separates methanogenesis and hydrolysis into two distinct reactors, offers significant advantages over conventional methods. The performance of AD systems is influenced by various factors, including growth conditions (such as carbon-tonitrogen ratio, pH, and temperature), operational parameters (such as retention time and organic loading rate), feedstock pretreatment, and potential inhibitors. While these aspects have been widely studied in single-stage anaerobic digestion systems, research on their impact in TAD systems remains limited. This study aims to provide a comprehensive review of the factors affecting TAD systems. It synthesizes the latest research findings from recent years and discusses optimal operating conditions to enhance TAD performance.
- Ấn phẩmA critical review on wireless power transfer systems using metamaterials(Viện Kỹ thuật Nhiệt đới, Viện Hàn lâm Khoa học và Công nghệ Việt Nam, 2022-06) Pham, Thanh Son; Bui, Xuan Khuyen; Bui, Son Tung; Le, Thi Hong Hiep; Vu, Dinh LamRecently, wireless power transfer (WPT) has been a topic of interest due to its attractive applications in modern life. Starting from Tesla’s idea about a century ago, WPT has developed tremendously and appeared in many of the most modern electronic devices. However, some WPT systems still have limitations such as short transmission distance, low transfer efficiency, and electromagnetic leakage. Magnetic metamaterial (MM) is a potential candidate that can overcome the above disadvantages of WPT. This paper is intended to present an overview of recent advances and research progress on WPT systems. Three classes of WPT consisting of short-range, mid-range, and long-range, will be analyzed in detail both in terms of fundamentals and applications. Especially, MM configurations can be used to enhance the nearfield WPT efficiency and reduce the leakage of electromagnetic field will also be evaluated. This article is expected to provide a comprehensive review of the mechanism and applications as well as the future development of metamaterial-based WPT systems.
- Ấn phẩmA data constrained approach for occupational silicosis detection on chest X-rays with few-shot learning(Viện Công nghệ thông tin, Viện Hàn lâm Khoa học và Công nghệ Việt Nam, 2025-03) Nguyen, Thi Tan Tien; Bui, Quoc Bao; Pham, Van CuongOccupational silicosis is a serious lung disease caused by long-term exposure to silica dust, mainly affcting workers in industries such as mining and construction. Diagnosis of silicosis is challenging due to subtle disease manifestations on chest X-rays (CXRs) and limited labeled medical data. Traditional deep learning models, such as Convolutional Neural Networks (CNNs), often require large datasets, which are often heavily expensive and time-consuming for collection and annotation, yet useful for specialized medical applications. To address these challenges, we present the use of FewShot Learning (FSL) to enable accurate detection of occupational silicosis with a minimal number of labeled examples. Our experimental results demonstrate that the FSL-based model achieves 84.4% accuracy and 46.0% mIoU in the 1-shot setting and 89.52% accuracy with 47.89% mIoU in the 4-shot setting. These fidings highlight the potential of FSL to improve diagnostic accuracy in datalimited environments, making it a viable solution for improving medical image analysis in resourceconstrained settings.