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Những tài liệu tải lên gần đây
- Ấn phẩmModel for calculating refractive index from energy gap for binary and ternary chalcopyrite semiconductors(Viện Kỹ thuật Nhiệt đới, Viện Hàn lâm Khoa học và Công nghệ Việt Nam, 2025-11) Umar, Farooque; Tarique, Rashid; Ajay, Kumar; Shadab, Rabbani; Faiz, AhmadBased on the energy gap (Eg) data, a simple model has been proposed for the calculation of refractive index (n) of the binary semiconductors, oxides, halides, insulators, and ternary chalcopyrite semiconductors of AIBIIICIV2 , and AIBIIICIV2 families. The refractive index values of the above-mentioned semiconductor materials have been calculated by utilizing the proposed model. Further, the reported values of the refractive index by different models in the literature for the considered semiconductor materials have also been mentioned for the comparison purpose. Moreover, the values of the average percentage deviations have been calculated for all models. The obtained values of the average percentage deviation for the proposed model is almost lowest compared to that of the reported models. Additionally, most of the reported models have not mentioned the values of refractive index for different semiconductor materials, while the proposed model has been utilized to calculate the values of refractive index for a wide range of semiconductor materials. Thus, it validates the suitability of our proposed model in the estimation of refractive index values of different technologically important materials.
- Ấn phẩmVibrations of cracked FGM microbeams based on Modified Coupled Stress Theory(Viện Kỹ thuật Nhiệt đới, Viện Hàn lâm Khoa học và Công nghệ Việt Nam, 2025-11) Chu, Thanh Binh; Tran, Van LienFree vibrations of cracked microbeams made of Functionally Graded Material (FGM) rested on the Winkler-Pasternak elastic foundation based on the Modified Coupled Stress Theory (MCST) are presented. Material properties of the beam vary throughout the thickness according to the power distribution and the Mori–Tanaka homogenization technique. The Timoshenko beam theory considering the size effect based on the MCST is applied. A sizedependent finite element model with new non-classical shape functions is proposed to obtain the stiffness and mass matrices of the intact FGM Timoshenko microbeam. The stiffness matrix of the cracked beam element obtained by adding an overall additional flexibility matrix to the flexibility matrix of the corresponding intact beam element can give more accurate natural frequencies. The influences of the size-effect, material, geometry, and crack parameters on natural frequencies and mode shapes are then analyzed. It is shown that the study results can be applied to other FGMs as well as more complex microbeam structures.
- Ấn phẩmStudy on solidified material from dredged sediment, fly ash, and blended portland cement using the response surface method(Viện Kỹ thuật Nhiệt đới, Viện Hàn lâm Khoa học và Công nghệ Việt Nam, 2025-11) Thai, Tien Dat; Huynh, Ngoc Minh; Luu, Tuyen; Kieu, Do Trung Kien; Nguyen, Vu Uyen Nhi; Do, Quang MinhTreating dredged sediment is a complex processing and ongoing challenge. To utilize dredged sediment for the landfill or construction purposes, a material fabricated from a mixture of dredged sediment, Portland cement, and fly ash, was cured under room temperature and hydrothermal condition at 180 °C and 0.9 MPa pressure for 16 hours. The response surface methodology was used to evaluate the compressive strength of the material, with a range of factors investigated including dredged sediment/solids ratio (0.3 - 0.9), cement/fly ash ratio (2 - 4), and water/solids ratio (0.45 - 0.55). The fitting models offered an accurate and reliable match to the actual data. The optimum mix proportions of the two curing conditions were obtained using a total desirability function, meeting multi-objective criteria. This result indicates that hydrothermal curing significantly enhances the treatment capacity of dredged sediment, with a lower CO2 emission in the mixture compared to ambient curing. Scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR) were used to figure out the difference between the minerals formed in the material under two curing conditions, such as tobermorite.
- Ấn phẩmStudy on solidified material from dredged sediment, fly ash, and blended portland cement using the response surface method(Viện Kỹ thuật Nhiệt đới, Viện Hàn lâm Khoa học và Công nghệ Việt Nam, 2025-11) Thai, Tien Dat; Huynh, Ngoc Minh; Luu, Tuyen; Kieu, Do Trung Kien; Nguyen, Vu Uyen Nhi; Do, Quang MinhTreating dredged sediment is a complex processing and ongoing challenge. To utilize dredged sediment for the landfill or construction purposes, a material fabricated from a mixture of dredged sediment, Portland cement, and fly ash, was cured under room temperature and hydrothermal condition at 180 °C and 0.9 MPa pressure for 16 hours. The response surface methodology was used to evaluate the compressive strength of the material, with a range of factors investigated including dredged sediment/solids ratio (0.3 - 0.9), cement/fly ash ratio (2 - 4), and water/solids ratio (0.45 - 0.55). The fitting models offered an accurate and reliable match to the actual data. The optimum mix proportions of the two curing conditions were obtained using a total desirability function, meeting multi-objective criteria. This result indicates that hydrothermal curing significantly enhances the treatment capacity of dredged sediment, with a lower CO2 emission in the mixture compared to ambient curing. Scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR) were used to figure out the difference between the minerals formed in the material under two curing conditions, such as tobermorite.
- Ấn phẩmImproved efficiency of bulk heterojunction polymer solar cells by omitting electron transport layer: a SCAPS 1D simulation study(Viện Kỹ thuật Nhiệt đới, Viện Hàn lâm Khoa học và Công nghệ Việt Nam, 2025-11) Ramabadran C. D.; Dhanya N. P.; Sudheer K. S.This paper examines the function of bulk heterojunction polymer solar cells (BHJPSCs) in the realm of photovoltaics. Specifically, the performance of a BHJPSC setup eliminating the electron transport layer (ETL) is investigated. With the aid of SCAPS 1D software, simulation studies are done to evaluate the effectiveness of this innovative approach. Initially, the program is standardized by replicating a key experimental study that used P3HT:IC60BA as the active layer, producing results consistent with actual observations. The solar cell structure ITO/PEDOT:PSS/P3HT:IC60BA/ZnO NPs/Al was studied where an efficiency of 3.97 % is achieved through standard procedures. Interestingly, byomitting the ETL in the simulations leads to a substantial efficiency of 10.83 % after optimization. This increased efficiency demonstrates an economically feasible solar cell structure. Improved photovoltaic performance may arise from additional research and optimisation of BHJPSC designs without ETL.
- Ấn phẩmGreen synthesis of nanostructured 1T/2H-MoS2 hybrid phase with polyol solvents and microwave heating(2025-11) Nguyen, Thi Minh Nguyet; Vuong, Vinh Dat; Nguyen, Huu Huy Phuc; Le, Van ThangGreen synthesis approaches have attracted much attention in recent years since they address sustainability-related issues better than conventional synthesis methods. New research fields in green nanoscience are being developed as a result of the incorporation of green chemistry principles into nanoscience. In this paper, the successful microwave-assisted green synthesis of MoS2 nanoparticles in a single pot using polyol solvents such as ethylene glycol and glycerol is demonstrated. The coexistence of 1T and 2H phases in MoS2 nanomaterials was determined using advanced techniques such as XRD, Raman, XPS, and TEM images. The highest 1T proportion obtained was 84.5 % when compared to the 2H phase. The reaction mechanism and the phase transition between 1T and 2H are described and illustrated. The role of polyol solvents in the practical synthesis of nano MoS2 under microwave heating is also evaluated and explained. Due to the ability of the metallic 1T phase to enhance electrical conductivity, it is believed that hybrid nanostructures exhibit superior electrochemical performance for energy storage and conversion applications.