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Hue University Journal of Science: Natural Science最新文献

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Energy-transfer phenomenon and color-tunable properties of Ca2Al2SiO7: Dy3+/Eu3+ phosphors Ca2Al2SiO7: Dy3+/Eu3+荧光粉的能量转移现象和颜色可调性质
Hue University Journal of Science: Natural Science Pub Date : 2023-06-30 DOI: 10.26459/hueunijns.v132i1b.6816
Do Thanh Tien, N. M. Sơn, Nguyen Dang Nhat, H. Tuyen, Le Xuan Diem Ngoc, T. Q. Toan
{"title":"Energy-transfer phenomenon and color-tunable properties of Ca2Al2SiO7: Dy3+/Eu3+ phosphors","authors":"Do Thanh Tien, N. M. Sơn, Nguyen Dang Nhat, H. Tuyen, Le Xuan Diem Ngoc, T. Q. Toan","doi":"10.26459/hueunijns.v132i1b.6816","DOIUrl":"https://doi.org/10.26459/hueunijns.v132i1b.6816","url":null,"abstract":"Ca2Al2SiO7 (CAS) doped with Eu3+ and Dy3+ was successfully synthesised with the solid-phase reaction method, in which the sample was sintered at 1,280 °C for one hour. The energy-transfer phenomenon from Dy3+ to Eu3+ was observed in the CAS matrix. The optimal doping concentration of Dy3+ and Eu3+ is 1.5 and 1% mol. In addition, the energy-transfer mechanism, CIE colour coordinate, and CCT colour temperature of CAS/Dy3+/Eu3+ were also presented and discussed.","PeriodicalId":13004,"journal":{"name":"Hue University Journal of Science: Natural Science","volume":"51 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77165996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Exciton quantum beats in GaAs/AlAs disk-shaped quantum dots GaAs/AlAs盘形量子点中的激子量子拍
Hue University Journal of Science: Natural Science Pub Date : 2023-06-30 DOI: 10.26459/hueunijns.v132i1b.6909
Thi Dieu Hien Le, Thi Ngoc Bao Le, Nhu Thao Dinh
{"title":"Exciton quantum beats in GaAs/AlAs disk-shaped quantum dots","authors":"Thi Dieu Hien Le, Thi Ngoc Bao Le, Nhu Thao Dinh","doi":"10.26459/hueunijns.v132i1b.6909","DOIUrl":"https://doi.org/10.26459/hueunijns.v132i1b.6909","url":null,"abstract":"Using the renormalized wavefunction approach, we examined the excitonic quantum beat in a three-level system in disk-shaped quantum dots. The non-stationary electron wave function and the time-dependent exciton absorption intensity under the effect of an intensity pump laser that resonates with two excited electron states were also provided. Our numerical findings demonstrate that the time-dependent exciton absorption intensity takes the shape of a periodic oscillation when the quantum dot is subjected to a powerful resonant pump laser. This is clear evidence that quantum beats appears in the quantum disk. Additionally, the dot radius and the pump field detuning significantly affect the beat characteristics, such as frequency and amplitude.","PeriodicalId":13004,"journal":{"name":"Hue University Journal of Science: Natural Science","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78381614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Adsorption capacity of chitosan hydrogel beads fabricated from Penaeus monodon shrimp shell waste for safranin o dye 对虾壳废液制备壳聚糖水凝胶珠对红花素o染料的吸附性能
Hue University Journal of Science: Natural Science Pub Date : 2023-06-30 DOI: 10.26459/hueunijns.v132i1b.6865
Thi Phuong Do, X. Nguyen
{"title":"Adsorption capacity of chitosan hydrogel beads fabricated from Penaeus monodon shrimp shell waste for safranin o dye","authors":"Thi Phuong Do, X. Nguyen","doi":"10.26459/hueunijns.v132i1b.6865","DOIUrl":"https://doi.org/10.26459/hueunijns.v132i1b.6865","url":null,"abstract":"In this study, we extracted chitosan from Penaeus monodon shrimp shell waste and used it as a bio-sorbent to remove safranin O (SO) dye in aqueous solutions. The chitosan adsorbent was characterised by using SEM and FTIR techniques. Batch adsorption experiments were carried out to evaluate the influence of solution pH (3–10), chitosan dosage (0.1–3 g), contact time (1–720 min), and initial SO concentration (10–200 mg·L–1) on adsorption. The results show that the adsorption of SO with chitosan reached equilibrium after 120 min, and after that, an insignificant change in SO removal efficiency was observed. The maximum adsorption capacity of SO, calculated according to the Langmuir model, was 17.86 mg·g–1 under ambient temperature (25 ± 2 °C), pH 7, chitosan dose of 0.2 g, and SO concentration of 50 mg·L–1. The adsorption kinetics followed the pseudo-second-order model with a correlation coefficient R2 of 0.95. The Langmuir and Freundlich adsorption isotherm models described the SO’s adsorption well, with R2 higher than 0.95.","PeriodicalId":13004,"journal":{"name":"Hue University Journal of Science: Natural Science","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77260452","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Non-doped phosphor for WLED with high CRI and R9 具有高显色比和R9的WLED用非掺杂荧光粉
Hue University Journal of Science: Natural Science Pub Date : 2023-06-30 DOI: 10.26459/hueunijns.v132i1b.6838
Thi To Nhu Dang, Minh Thong Nguyen, M. Nguyen, Xuan-Viet Dao, Thao Vien Le
{"title":"Non-doped phosphor for WLED with high CRI and R9","authors":"Thi To Nhu Dang, Minh Thong Nguyen, M. Nguyen, Xuan-Viet Dao, Thao Vien Le","doi":"10.26459/hueunijns.v132i1b.6838","DOIUrl":"https://doi.org/10.26459/hueunijns.v132i1b.6838","url":null,"abstract":"The effect of the ZnO/SnO2 ratio on phase formation and optical properties of the Zn-Sn-O compound was investigated by varying the ZnO/SnO2 molar ratio (ZnO/SnO2  = 1:2, 1:1, 2:1, 3:1, and 4:1). All samples were synthesised with high-energy planetary ball milling, followed by calcination at 1000 °C in the air. The result from X-Ray diffraction patterns (XRD) shows that the single-phase Zn2SnO4 is achieved at the ZnO/SnO2 ratio of 2:1. Whereas, the mixed phase of ZnO and Zn2SnO4 formed when ZnO is more than SnO2 (3:1 and 4:1). On the other hand, the XRD patterns of the products obtained at a ratio where SnO2 is more than ZnO present a mixture of SnO2 and Zn2SnO4. The photoluminescence of the two samples with the ratio of 2:1 and 1:3 gives full-visible range spectra from 400 to 800 nm, which are in the blue-far-red region centred at about 514, 580, and 690 nm. Temperature-dependent luminescence measurements were also carried out in this work, and the results indicate that the prepared phosphor Zn-Sn-O at the ZnO/SnO2 ratio of 1:2 has thermal stability. The obtained material was used to coat near UV LED chips, and the WLED possesses the highest CRI of 95. The SnO2-Zn2SnO4 powder can be used as a phosphor for WLED applications with high CRI and R9.","PeriodicalId":13004,"journal":{"name":"Hue University Journal of Science: Natural Science","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74804819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Modification of Phu Yen diatomite and its application to Cr(VI) removal in aqueous medium Phu Yen硅藻土的改性及其在水中去除Cr(VI)的应用
Hue University Journal of Science: Natural Science Pub Date : 2023-06-30 DOI: 10.26459/hueunijns.v132i1b.6942
Vinh-Thien Tran
{"title":"Modification of Phu Yen diatomite and its application to Cr(VI) removal in aqueous medium","authors":"Vinh-Thien Tran","doi":"10.26459/hueunijns.v132i1b.6942","DOIUrl":"https://doi.org/10.26459/hueunijns.v132i1b.6942","url":null,"abstract":"In this study, we successfully prepared a carboxyl-rich carbon nanomaterial from Phu Yen natural diatomite and used it as an effective adsorbent to remove Cr(VI) in aqueous media. The obtained nanomaterial was characterized by means of XRD, SEM, EDS, and FT-IR. The adsorption characteristics of Cr(VI) were investigated. pH has a significant influence on the adsorption process, and pH = 1 is optimal for Cr(VI) adsorption at ambient temperature. Three types of materials were prepared, including natural diatomite (DE), modified diatomite with carbon nanomaterial (DE/S), and modified diatomite with carboxyl-rich carbon nanomaterial (DE/C-S), and DE/C-S exhibits the highest adsorption capacity under the optimal conditions. The pseudo-second-order kinetic model and the Langmuir isotherm well describe the adsorption process of Cr(VI) onto DE/C-S with the maximum adsorption capacity of 58.82 mg·g–1, which is significantly higher compared with that of the natural diatomite (2.29 mg·g–1). Carboxyl-rich carbon-modified diatomite nanomaterials have great potential for use in removing Cr(VI) from wastewater.","PeriodicalId":13004,"journal":{"name":"Hue University Journal of Science: Natural Science","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78184140","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Imaginary part of microscopic optical potential at negative energies 负能量下微观光学势的虚部
Hue University Journal of Science: Natural Science Pub Date : 2023-06-30 DOI: 10.26459/hueunijns.v132i1b.6871
Tam Do Quang, Vinh Phu Nguyen, Minh Hoa Nguyen, Hong Nguyen Thi, Quynh Nhu Tran Duy, Nhan Hao Tran Viet, Le Uyen Vo
{"title":"Imaginary part of microscopic optical potential at negative energies","authors":"Tam Do Quang, Vinh Phu Nguyen, Minh Hoa Nguyen, Hong Nguyen Thi, Quynh Nhu Tran Duy, Nhan Hao Tran Viet, Le Uyen Vo","doi":"10.26459/hueunijns.v132i1b.6871","DOIUrl":"https://doi.org/10.26459/hueunijns.v132i1b.6871","url":null,"abstract":"In this paper, we calculate the diagonal contributions W(R, s = 0) of the imaginary part of the microsopic optical potential at negatives energies, where W(R, s) =Σlj(2j+1)/4π Im∆Σlj(r, r′, ω), with R = 1/2.(r + r′) corresponding to the radius and shape ofIm∆Σ, and s = r - r′. To do it, the microscopic optical potential has been calculatedby using the nuclear structure approach which is based on the Green function method. The coupling between the particle and collective phonon has been performed to calculate the dynamic part of the optical potential. It has been found that the imaginary part at negative energies is very small as expected. The calculated W(R, 0) is maximum on the surface and deacreases to zero in the interior.","PeriodicalId":13004,"journal":{"name":"Hue University Journal of Science: Natural Science","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84468137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Synthesis and physical properties of multiferroic BaDyFeO4 多铁性BaDyFeO4的合成及物理性质
Hue University Journal of Science: Natural Science Pub Date : 2023-06-30 DOI: 10.26459/hueunijns.v132i1b.6912
T. T. Le, Danh Bich Do, Thanh Khan Dinh, T. Tran, Vu Truong Son Le, N. Dang, T. Nguyen
{"title":"Synthesis and physical properties of multiferroic BaDyFeO4","authors":"T. T. Le, Danh Bich Do, Thanh Khan Dinh, T. Tran, Vu Truong Son Le, N. Dang, T. Nguyen","doi":"10.26459/hueunijns.v132i1b.6912","DOIUrl":"https://doi.org/10.26459/hueunijns.v132i1b.6912","url":null,"abstract":"Materials exhibiting magnetoelectric effects have drawn great interest because of their intriguing physical phenomena and potential applications in electronic devices. The magnetoelectric (ME) coupling makes the materials promising for use in multifunctional devices with electric-field-tunable magnetism and magnetic-field-controlled ferroelectricity. Very recently, a strong ME effect has been found in the BaRFeO4 system (R is a rare-earth element), in which the ferroelectricity is driven by the onset of a long-range cycloidal antiferromagnetic order of Fe spins. However, previous studies have shown how complicated the synthesis procedure is to obtain single-phase samples of the materials. In this work, we present a simple and easy fabrication process to synthesise high-quality BaDyFeO4 using the conventional solid-state reaction method. The structural, morphological, and optical properties of the synthesised sample were investigated by means of X-ray diffraction, scanning electron microscopy, and UV-Vis spectroscopy, respectively. The sample was formed from high-quality microparticles. The X-ray diffraction study reveals the single-phase nature of the sample adopting the Pnma orthorhombic structure without any impurity phases. The detailed structural parameters were refined with Rietveld refinement. The sample demonstrates a direct gap semiconducting behaviour. The experimental results of the structural and electronic properties of BaDyFeO4 are complemented by density functional theory (DFT) calculations.","PeriodicalId":13004,"journal":{"name":"Hue University Journal of Science: Natural Science","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74534854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Additional data on species diversity of gobies (Actinopteri: Gobiiformes) in Xuan Thuy National Park, Nam Dinh province 南定省宣翠国家公园虾虎鱼物种多样性的补充资料(放线鱼目:虾虎目)
Hue University Journal of Science: Natural Science Pub Date : 2023-06-30 DOI: 10.26459/hueunijns.v132i1b.7050
Van Long Pham, Hoang Nam Chu, Thi Thanh Huyen Dang, H. Nguyen, Duc Hau Tran
{"title":"Additional data on species diversity of gobies (Actinopteri: Gobiiformes) in Xuan Thuy National Park, Nam Dinh province","authors":"Van Long Pham, Hoang Nam Chu, Thi Thanh Huyen Dang, H. Nguyen, Duc Hau Tran","doi":"10.26459/hueunijns.v132i1b.7050","DOIUrl":"https://doi.org/10.26459/hueunijns.v132i1b.7050","url":null,"abstract":"Xuan Thuy National Park in the Red River Delta Biosphere Reserve is a biodiverse area that supports a variety of flora, fauna, and fishery resources. This study aims to provide new data on goby fish in this area by conducting monthly collections from 2018 to 2019. Based on morphological analysis, we identified 43 species of gobies, 27 of which were tropical fish. We added three new goby records to the fish fauna of Vietnam, three to northern Vietnam, and eight to the study site. The goby community was dominated by two species, namely Glossogobius olivaceus and Glossogobius giuris. Besides, the goby community of Xuan Thuy National Park is nearest to that of Tien Hai Wetland Nature Reserve but is far different from that of Ha Long Bay. This study area has a more diverse goby community than other locations in northern Vietnam. These findings further suggest the importance of this mangrove forest for gobies, and they are fundamental data for conservation and sustainable exploitation.","PeriodicalId":13004,"journal":{"name":"Hue University Journal of Science: Natural Science","volume":"1999 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88251509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
The local uniform convergence of positive harmonic function sequence 正调和函数序列的局部一致收敛性
Hue University Journal of Science: Natural Science Pub Date : 2023-05-09 DOI: 10.26459/hueunijns.v131i1d.6663
Dang Thinh Do, Le Dieu Linh Tran, Nhat Quy Hoang
{"title":"The local uniform convergence of positive harmonic function sequence","authors":"Dang Thinh Do, Le Dieu Linh Tran, Nhat Quy Hoang","doi":"10.26459/hueunijns.v131i1d.6663","DOIUrl":"https://doi.org/10.26459/hueunijns.v131i1d.6663","url":null,"abstract":"The Harnack distance on space  and its conformal invariance were constructed and studied by Herron. In this paper, we obtain the Harnack distance on domains  in . Then, we use this concept to investigate some properties of the positive harmonic function class. These results are obtained in the complex plane, so it is advantageous to take some tools of the complex analysis. The main result of this paper is the property of the local uniform convergence of the positive harmonic sequences on a domain in the complex plane.","PeriodicalId":13004,"journal":{"name":"Hue University Journal of Science: Natural Science","volume":"74 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79978844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Sample decomposition to determine microplastics in parts of mullets 样品分解以测定鲻鱼部分的微塑料
Hue University Journal of Science: Natural Science Pub Date : 2023-03-31 DOI: 10.26459/hueunijns.v132i1a.7095
Thi Ai My Tran, T. H. Phan, A. Tran, Q. D. Luong, Van Quy Vo
{"title":"Sample decomposition to determine microplastics in parts of mullets","authors":"Thi Ai My Tran, T. H. Phan, A. Tran, Q. D. Luong, Van Quy Vo","doi":"10.26459/hueunijns.v132i1a.7095","DOIUrl":"https://doi.org/10.26459/hueunijns.v132i1a.7095","url":null,"abstract":"In this study, a 10% KOH solution was used to decompose the meat, skin, and digestive system of mullets. The factors in each experiment are as follows: 1) VKOH:mmeat is 10/1 (mL·g–1), incubated at 25 °C for 72 h; VKOH:mskin is 15/1 (mL·g–1), incubated at 40 °C for 72 h; VKOH:mdigestive system is 20/1 (mL·g–1), incubated at 40 °C for 72 h. The actual sample images display microplastics in the surveyed parts of the mullets with different shapes and colours.","PeriodicalId":13004,"journal":{"name":"Hue University Journal of Science: Natural Science","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84840153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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