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Hue University Journal of Science: Natural Science最新文献

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Influence of nitrogen level and plant density on growth parameters and economic efficiency of sunflower cultured in Thua Thien Hue province 氮素水平和密度对顺化向日葵生长参数和经济效益的影响
Hue University Journal of Science: Natural Science Pub Date : 2022-06-30 DOI: 10.26459/hueunijns.v131i1b.6219
H. Truong, T. T. Phan
{"title":"Influence of nitrogen level and plant density on growth parameters and economic efficiency of sunflower cultured in Thua Thien Hue province","authors":"H. Truong, T. T. Phan","doi":"10.26459/hueunijns.v131i1b.6219","DOIUrl":"https://doi.org/10.26459/hueunijns.v131i1b.6219","url":null,"abstract":"Sunflower (Helianthus annuus) cultivation is gaining popularity among Vietnamese farmers. Two separate experiments were conducted from January to April 2018 in a randomized complete block design with three replicates. Four levels of each factor were included in the experiments: 0, 20, 40, and 60 kg/ha for nitrogen and 11, 13, 16, and 20 plants/m2 for the density. The nitrogen fertilizer (up to 60 kg/ha) substantially affects the leaf area, diameters of stem plant, receptacle and flower head, and cut flower vase life. Low plant density works well on plant height, leaf number, width and length at the flowering stage, with the largest head diameter (17.2 cm) at the 13 plants/m2 density. Based on the results of both growth ability and economic efficiency, we suggested applying N at 60 kg/ha and planting at 16 plants/m2 density for growing F1 cut sunflowers in Thua Thien Hue province.","PeriodicalId":13004,"journal":{"name":"Hue University Journal of Science: Natural Science","volume":"34 10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82781219","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
Magneto-transport properties of monolayer borophene in perpendicular magnetic field: influence of electron-phonon interaction 垂直磁场中单层硼罗芬的磁输运性质:电子-声子相互作用的影响
Hue University Journal of Science: Natural Science Pub Date : 2022-06-30 DOI: 10.26459/hueunijns.v131i1b.6561
Ta T. Tho, T. Huynh, V. C. Nguyen, M. Luong, D. Bui
{"title":"Magneto-transport properties of monolayer borophene in perpendicular magnetic field: influence of electron-phonon interaction","authors":"Ta T. Tho, T. Huynh, V. C. Nguyen, M. Luong, D. Bui","doi":"10.26459/hueunijns.v131i1b.6561","DOIUrl":"https://doi.org/10.26459/hueunijns.v131i1b.6561","url":null,"abstract":"The magneto-transport properties of a borophene monolayer in a perpendicular magnetic field B are studied via calculating the conductivity tensor and resistance under electron-optical phonon interaction by using the linear response theory. Numerical results are obtained and discussed for some specific parameters. The magnetic field-dependent longitudinal conductivity shows the magneto-phonon resonance effect that describes the transition of electrons between Landau levels by absorbing/emitting an optical phonon. The Hall conductivity increases first and then decreases with the magnetic field strength. Also, the longitudinal resistance increases significantly with increasing temperature, which shows the metal behaviour of the material. Practically, the observed magneto-phonon resonance can be applied to experimentally determine some material parameters, such as the distance between Landau levels and the optical phonon energy.","PeriodicalId":13004,"journal":{"name":"Hue University Journal of Science: Natural Science","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86106074","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
The Dedekind different for a uniform set of points in 对于一致的点集，Dedekind是不同的
Hue University Journal of Science: Natural Science Pub Date : 2022-06-30 DOI: 10.26459/hueunijns.v131i1b.6563
N. K. L. Tran, Ngoc Long Le
{"title":"The Dedekind different for a uniform set of points in","authors":"N. K. L. Tran, Ngoc Long Le","doi":"10.26459/hueunijns.v131i1b.6563","DOIUrl":"https://doi.org/10.26459/hueunijns.v131i1b.6563","url":null,"abstract":"Given a set of s distinct points X in the projective space Pn over a field K, we are interested in studying the uniformity of X. Explicitly, we work out an algorithm for checking the uniformity of X and we apply the Dedekind different to characterize some uniformity conditions of X.\u0000 ","PeriodicalId":13004,"journal":{"name":"Hue University Journal of Science: Natural Science","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83669522","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
Effect of shell thickness on heterostructure of CdSe/CdS core/shell nanocrystals 壳层厚度对CdSe/CdS核壳纳米晶异质结构的影响
Hue University Journal of Science: Natural Science Pub Date : 2022-06-30 DOI: 10.26459/hueunijns.v131i1b.6491
A. Le, Minh Tan Man, M. H. Nguyen
{"title":"Effect of shell thickness on heterostructure of CdSe/CdS core/shell nanocrystals","authors":"A. Le, Minh Tan Man, M. H. Nguyen","doi":"10.26459/hueunijns.v131i1b.6491","DOIUrl":"https://doi.org/10.26459/hueunijns.v131i1b.6491","url":null,"abstract":"Core/shell hetero-nanostructures are promising materials for fabricating optoelectronic devices, photodetectors, bioimaging, and biosensing. The CdSe/CdS core/shell nanocrystals (NCs) were synthesized in a wet chemical reaction. The shell thickness was modified by varying reaction times. The structure and optical properties as a function of the CdS shell thickness were investigated. A systematic redshift of the first exciton absorption peaks and photoluminescent (PL) spectra occurred after coating with CdS confirmed the shell growth over the CdSe core. The PL's intensity increased compared with that of bare NCs. The formation of high-quality NCs with uniform size distribution was shown in the transmission electron microscopy (TEM) image and confirmed by the narrow PL band and small FWHM.","PeriodicalId":13004,"journal":{"name":"Hue University Journal of Science: Natural Science","volume":"149 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91528514","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
In vitro bioactivities of Codonopsis javanica root extract from Kon Tum province, Vietnam 越南坤土省土参根提取物的体外生物活性研究
Hue University Journal of Science: Natural Science Pub Date : 2022-06-30 DOI: 10.26459/hueunijns.v131i1b.6419
Hai Ha Pham Thi, Kien Cuong Tran, Thi Thu An Nguyen, Lan Phan- Hoang Nguyen, Thuan Anh Nguyen Huu, L. Bach, Thi Minh Phuong Than, Dinh Lieu Chu, Van Thanh Danh Le, Thanh Luan Nguyen
{"title":"In vitro bioactivities of Codonopsis javanica root extract from Kon Tum province, Vietnam","authors":"Hai Ha Pham Thi, Kien Cuong Tran, Thi Thu An Nguyen, Lan Phan- Hoang Nguyen, Thuan Anh Nguyen Huu, L. Bach, Thi Minh Phuong Than, Dinh Lieu Chu, Van Thanh Danh Le, Thanh Luan Nguyen","doi":"10.26459/hueunijns.v131i1b.6419","DOIUrl":"https://doi.org/10.26459/hueunijns.v131i1b.6419","url":null,"abstract":"Dangshen Codonopsis javanica exhibits invaluable medicinal properties in herbal remedies; however, there has currently not been much specific analysis of the phytochemicals and bioactivities of this plant. The root ethanol extract of C. javanica contains substances such as saponins, phenolic acids, terpenoids, and alkaloids. It displays an antibacterial effect against Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, and Bacillus cereus with the IC50 values of 150, 100, 150, and 90 μg/mL, respectively. The antioxidant capacity of the root extract was also observed with an IC50 value of 46.8 ± 6.8 μg/mL. Furthermore, the extract exhibits activity on human cancer cell lines HepG2 (IC50 = 83.6 ± 2.7 μg/mL) and MCF-7 (IC50 = 95.3 ± 2.3 μg/mL). Hence, this study provides the basic data for further research on the bioactivities of natural compounds of Dangshen C. javanica for the first time.","PeriodicalId":13004,"journal":{"name":"Hue University Journal of Science: Natural Science","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81970727","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
Silicon quantum-dots-based optical probe for fluorometric detection of Cr6+ ions 基于硅量子点的光学探针荧光检测Cr6+离子
Hue University Journal of Science: Natural Science Pub Date : 2022-06-30 DOI: 10.26459/hueunijns.v131i1b.6546
Duc Tho Do, Van Nam Luyen, Thi My Huyen Nguyen, Manh Hung Pham, V. Pham, T. N. L. Truong
{"title":"Silicon quantum-dots-based optical probe for fluorometric detection of Cr6+ ions","authors":"Duc Tho Do, Van Nam Luyen, Thi My Huyen Nguyen, Manh Hung Pham, V. Pham, T. N. L. Truong","doi":"10.26459/hueunijns.v131i1b.6546","DOIUrl":"https://doi.org/10.26459/hueunijns.v131i1b.6546","url":null,"abstract":"In this report, silicon quantum dots (SiQDs) with the NH2 functional group were synthesized with the hydrothermal method. The as-prepared SiQDs exhibit a strong fluorescence emission peak               at 441 nm when excited at 355 nm and are effectively quenched upon adding Cr6+ ions. Hence, SiQDs were used as an optical probe to detect Cr6+ ions in solutions. The crystal structure of SiQDs was characterized by using X-ray diffraction (XRD). The Fourier-transform infrared spectroscopy (FT-IR) was used to determine the linker groups on the SiQDs surface. The fluorescence spectroscopic technique with an excitation wavelength of 355 nm was used to quantify the Cr6+ ion concentration in the solutions in the range of 0.1–1000 µM. Competition from common coexisting ions, such as K+, Na+, Al3+, Zn2+, and Pb2+, was ignorable. The test with actual samples showed good linearity for the Cr6+ concentration range of 0.1–50 µM.","PeriodicalId":13004,"journal":{"name":"Hue University Journal of Science: Natural Science","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78405021","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
Biocontrol of Alternaria alternata YZU, a causal of stem end rot disease on pitaya, with soil phosphate solubilizing bacteria 土壤增磷菌防治火龙果茎端腐病的研究
Hue University Journal of Science: Natural Science Pub Date : 2022-06-30 DOI: 10.26459/hueunijns.v131i1b.6505
Q. Do, The Anh Luu, Mai-Van Dinh, Bich Ngoc Pham, Thi Thu An Nguyen
{"title":"Biocontrol of Alternaria alternata YZU, a causal of stem end rot disease on pitaya, with soil phosphate solubilizing bacteria","authors":"Q. Do, The Anh Luu, Mai-Van Dinh, Bich Ngoc Pham, Thi Thu An Nguyen","doi":"10.26459/hueunijns.v131i1b.6505","DOIUrl":"https://doi.org/10.26459/hueunijns.v131i1b.6505","url":null,"abstract":"Stem end rot is the most destructive disease caused by Alternaria alternata YZU in pitaya-growing regions of Vietnam. This study was conducted to characterize antagonistic phosphate-solubilizing bacteria (PSB) from rhizosphere soil for their biocontrol activities against A. alternata YZU and evaluate the effect of temperature, pH, and water activity on that antagonism. Among seven PSB isolated from 45 rhizosphere soil samples, PSB31 (identified as Bacillus sp. strain IMAU61039, Accession number: MF803700.1) exhibited the highest antagonistic activity against A. alternata YZU with an average inhibition diameter of 0.65 ± 0.05 cm. The results also show that the strain PSB31 controlled the mycelial growth of A. alternata YZU by secreting antifungal metabolites. The most potent inhibitory activity was identified under in vitro conditions of 25 °C, pH 7, and aw 1. The isolated PSB31 could be a potential biological control agent against A. alternata YZU.","PeriodicalId":13004,"journal":{"name":"Hue University Journal of Science: Natural Science","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89637418","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
Depth-dose distribution in potatoes with low-energy X-rays 马铃薯的低能x射线深度剂量分布
Hue University Journal of Science: Natural Science Pub Date : 2022-06-30 DOI: 10.26459/hueunijns.v131i1b.6514
Thi Nguyet Nga Nguyen, Kume Tamikazu, An Son Nguyen, Thi Minh Sang Nguyen, Thi Ngoc Ha Pham, Danh Hung Nguyen, Van Hai Cao, Quang Kien Nguyen, Huu Duc Nguyen, Thi Le Do
{"title":"Depth-dose distribution in potatoes with low-energy X-rays","authors":"Thi Nguyet Nga Nguyen, Kume Tamikazu, An Son Nguyen, Thi Minh Sang Nguyen, Thi Ngoc Ha Pham, Danh Hung Nguyen, Van Hai Cao, Quang Kien Nguyen, Huu Duc Nguyen, Thi Le Do","doi":"10.26459/hueunijns.v131i1b.6514","DOIUrl":"https://doi.org/10.26459/hueunijns.v131i1b.6514","url":null,"abstract":"Irradiation is known as a handful measure to inhibit potato sprouting, kill harmful bacteria, and increase preservation. The absorbed dose is one of the essential characteristics of the irradiation process. In this study, the depth-dose distributions in potatoes and polymethyl methacrylate were investigated under low-energy X-ray irradiation by using the Fricke dosimeter and Gafchromic film dosimeter. The dose rates required for the rays to penetrate in polymethyl methacrylate were compared with those in potatoes. Polymethyl methacrylate could be used as a phantom in measuring the depth dose delivered in potatoes. The difference in depth-dose distribution in potatoes between one-sided and double-sided irradiation was also investigated. The calculated dose uniformity ratio values are 5.8 and 1.9 for potatoes irradiating one-sided and double-sided.","PeriodicalId":13004,"journal":{"name":"Hue University Journal of Science: Natural Science","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74193679","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
Growth and morphological responses of Halophila beccarii to low salinity 贝氏嗜盐菌对低盐度的生长和形态响应
Hue University Journal of Science: Natural Science Pub Date : 2022-06-30 DOI: 10.26459/hueunijns.v131i1b.6452
Xuan Dang Thi Le Xuan, T. H. Phan, Cong Tin Hoang, That Phap Ton, Q. D. Luong
{"title":"Growth and morphological responses of Halophila beccarii to low salinity","authors":"Xuan Dang Thi Le Xuan, T. H. Phan, Cong Tin Hoang, That Phap Ton, Q. D. Luong","doi":"10.26459/hueunijns.v131i1b.6452","DOIUrl":"https://doi.org/10.26459/hueunijns.v131i1b.6452","url":null,"abstract":"Halophila beccarii Ascherson is classified as a threatened seagrass species by IUCN because of the reductive tendency of ​​its distribution area. This seagrass is considered a euryhaline species adapted to a wide range of salinities from freshwater and brackish water to marine water. Previous studies showed that the species tends to grow better under low salinity; however, its optimum salinity has not been determined. In Vietnam, H. beccarii grows in habitats with low salinity (0–20 ppt). The results show that salinity affects the growth, survival rate, shoot density, biomass, and morphological characteristics of the grass. The leaf dimension is more prolonged and broader; the petiole and shoot length are longer at 10 ppt salinity. In contrast, both the number of shoots and biomass peak at 5 ppt and decrease at lower and higher salinities. The study reveals that H. beccarii can grow better under mesohaline conditions than freshwater and hypersaline conditions with an optimum salinity at 5–10 ppt. These findings would explain the species’ distribution dynamics in coastal environments and be helpful information for conserving the seagrass populations in habitats with fluctuating salinity as coastal lagoons in Central Vietnam.","PeriodicalId":13004,"journal":{"name":"Hue University Journal of Science: Natural Science","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75613320","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
Fabrication of TiO2 nanofibre photoelectrode for photoelectrochemical cells 光电化学电池用TiO2纳米纤维光电极的制备
Hue University Journal of Science: Natural Science Pub Date : 2022-06-30 DOI: 10.26459/hueunijns.v131i1b.6412
N. Nghia, Ngoc Khoa Nguyen Truong, Hieu Nhat Hoang
{"title":"Fabrication of TiO2 nanofibre photoelectrode for photoelectrochemical cells","authors":"N. Nghia, Ngoc Khoa Nguyen Truong, Hieu Nhat Hoang","doi":"10.26459/hueunijns.v131i1b.6412","DOIUrl":"https://doi.org/10.26459/hueunijns.v131i1b.6412","url":null,"abstract":"The TiO2 nanofibres (NFs), prepared with the electrospinning method, acted as the photoanode in a photoelectrochemical cell (PEC) for hydrogen generation. The fabrication parameters of Ti/PVP (polyvinylpyrrolidone) fibres were determined with the field-emission scanning electron microscopy (FE-SEM) method. The structure and morphology of the TiO2 fibres were characterized by using X-ray diffraction (XRD), FE-SEM, transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HR-TEM). The average diameter of the TiO2 fibre is 132 ± 16 nm. A three-electrode potentiostat was used to study the photoelectrochemical properties of the photoanode. The density photocurrent reached the saturation value of 80 mA·cm–2 at 0.2 V under the irradiation of a Xenon lamp.","PeriodicalId":13004,"journal":{"name":"Hue University Journal of Science: Natural Science","volume":"139 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79192348","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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