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YOUNG MODULUS OF THIN FILMS Au AND AuSi WITH FCC STRUCTURE FCC结构Au和AuSi薄膜的杨氏模量
Journal of Science Natural Science Pub Date : 2022-10-01 DOI: 10.18173/2354-1059.2022-0038
Hoc Nguyen Quang, Dat Hua Xuan, Thao Nguyen Thi
{"title":"YOUNG MODULUS OF THIN FILMS Au AND AuSi WITH FCC STRUCTURE","authors":"Hoc Nguyen Quang, Dat Hua Xuan, Thao Nguyen Thi","doi":"10.18173/2354-1059.2022-0038","DOIUrl":"https://doi.org/10.18173/2354-1059.2022-0038","url":null,"abstract":"We build the model and the theory of Young modulus for FCC metal’s and binary interstitial alloy’s thin films on the basis of the statistical moment method and perform numerical calculations for Au and AuSi. Some SMM calculations for bulk Au are compared with experiments and other calculations. Other SMM calculations are new and predictive, experimentally oriented.","PeriodicalId":17007,"journal":{"name":"Journal of Science Natural Science","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88085666","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
USING SENTINEL IMAGES FOR THE ESTIMATION OF RICE BIOMASS IN QUOC OAI DISTRICT (HANOI) 利用哨点图像估算河内市quoc oai地区水稻生物量
Journal of Science Natural Science Pub Date : 2022-10-01 DOI: 10.18173/2354-1059.2022-0052
Khac Dang Vu, Trang Doan Hoai
{"title":"USING SENTINEL IMAGES FOR THE ESTIMATION OF RICE BIOMASS IN QUOC OAI DISTRICT (HANOI)","authors":"Khac Dang Vu, Trang Doan Hoai","doi":"10.18173/2354-1059.2022-0052","DOIUrl":"https://doi.org/10.18173/2354-1059.2022-0052","url":null,"abstract":"During the rice production process, the rice straw - one of the residual products becomes an environmental pollutant due to the open burning giving rise to greenhouse gases emission. That’s why the identification of gas emissions needs to estimate the amount of rice biomass. Remote sensing data has been exploited to determine the area of rice cultivation and to estimate the dry rice biomass in Quoc Oai district, Hanoi city. On the one hand, the Sentinel-2 image was used to classify the land cover categories, thereby identifying the spatial distribution of the rice to delimit the extent of rice biomass, which was obtained from regression analysis. On the other hand, the Sentinel-1 radar image was used to calculate the rice biomass during the summer season when Sentinel-2 images have constraints due to clouds, fog, and mist. The validation of image classification has provided an overall accuracy of 86.31% with a Kappa index of 0.81. Meanwhile, the regression analysis shows a high correlation between the backscattering values of VV and VH in the radar image and the dry rice biomass measured on the ground (R = 0.923 and R2 = 0.852), with a relatively low average error (RMSE = 6.58 kg100 m2). By linear regression method, the study has found the total dry rice biomass of 28728.5 tons, which was revealed after the Summer-Autumn rice crop 2021 for the whole Quoc Oai district. The results from this study have proved the effectiveness of the method and they have contributed to supporting managers in proposing the appropriate policies to monitor and protect the environment in the future.","PeriodicalId":17007,"journal":{"name":"Journal of Science Natural Science","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88930539","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
ECHOLOCATION CALLS OF Myotis alticraniatus (CHIRROPTERA: VESPERTILIONIDAE) IN VIETNAM 越南高颅肌蝗的回声定位叫声(翅目:大翅蝗科)
Journal of Science Natural Science Pub Date : 2022-10-01 DOI: 10.18173/2354-1059.2022-0049
Thong Vu Dinh, Loi Dao Nhan, Thanh Hoang Trung, Nha Pham Van, Nga Cao Thi Thanh, Sengmanichanh Phaly, Ha Nguyen Manh, Toan Vu Duc, Thai Dinh Van, Viet Nguyen Van
{"title":"ECHOLOCATION CALLS OF Myotis alticraniatus (CHIRROPTERA: VESPERTILIONIDAE) IN VIETNAM","authors":"Thong Vu Dinh, Loi Dao Nhan, Thanh Hoang Trung, Nha Pham Van, Nga Cao Thi Thanh, Sengmanichanh Phaly, Ha Nguyen Manh, Toan Vu Duc, Thai Dinh Van, Viet Nguyen Van","doi":"10.18173/2354-1059.2022-0049","DOIUrl":"https://doi.org/10.18173/2354-1059.2022-0049","url":null,"abstract":"Myotis alticraniatus is a small mammal species with widespread distribution in Vietnam and other Asian countries. However, prior to the present study, its echolocation calls were poorly documented. Between 2018 and 2020, we conducted bat surveys in Cat Ba National Park and other areas of Vietnam. Echolocation calls of the species were obtained in different recording situations: handheld, flying inside a fight tent and foraging in natural habitats. The average initial frequency (iFM) and terminal frequency (tFM) of this species’ echolocation calls are in ranges of 113.2-140 kHz and 57.8-68.6 kHz, respectively. Its call duration is in a range of 1.6-3.9 ms. When detecting an object or prey in natural habitats, the species emitted echolocation calls in groups of up to 10 signals with the iFM and tFM values in ranges of 60.6-64.3 kHz and 28.2-31.0 kHz, respectively. Results from the present study exhibited a wide variation in frequencies and signal shapes of the species echolocation calls.","PeriodicalId":17007,"journal":{"name":"Journal of Science Natural Science","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79367669","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
SODIUM SULFIDE-PROMOTED REACTION OF 2-AMINOBENZAMIDE AND BENZYL ALCOHOLS WITH ELEMENTAL SULFUR: A NOVEL APPROACH WITH 2-ARYL-QUINAZOLIN-4(3H) 硫化钠促进2-氨基苯甲酰胺和苯甲醇与单质硫的反应:2-芳基喹唑啉-4(3h)的新方法
Journal of Science Natural Science Pub Date : 2022-10-01 DOI: 10.18173/2354-1059.2022-0043
Hien M. Nguyen, Hiếu Nguyễn Trung, Mai Nguyen Thi Ngoc, May Pham Thi Thu, Hiền Nguyễn Thị Thu, Hoan Duong Quoc
{"title":"SODIUM SULFIDE-PROMOTED REACTION OF 2-AMINOBENZAMIDE AND BENZYL ALCOHOLS WITH ELEMENTAL SULFUR: A NOVEL APPROACH WITH 2-ARYL-QUINAZOLIN-4(3H)","authors":"Hien M. Nguyen, Hiếu Nguyễn Trung, Mai Nguyen Thi Ngoc, May Pham Thi Thu, Hiền Nguyễn Thị Thu, Hoan Duong Quoc","doi":"10.18173/2354-1059.2022-0043","DOIUrl":"https://doi.org/10.18173/2354-1059.2022-0043","url":null,"abstract":"Six derivatives containing benzoxazole were synthesized from phydroxybenzaldehyde via four step-route in high yields. The benzoxazole cyclization step was promoted with microwave irradiation for 10 to 30 min. Free oaminophenol derivative A3 reacted with aldehydes to form benzoxazole A4a-f, but A3.HCl couldn’t due to the presence of iron (II). Their structures were elucidated with spectroscopic methods: IR, 1D, 2D NMR, and MS.","PeriodicalId":17007,"journal":{"name":"Journal of Science Natural Science","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85068630","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 OF SOME BENZOTHIAZOLE ANILINE DERIVATIVES AND THEIR BIOLOGICAL ACTIVITIES 苯并噻唑类苯胺衍生物的合成及其生物活性
Journal of Science Natural Science Pub Date : 2022-10-01 DOI: 10.18173/2354-1059.2022-0042
Hoan Duong Quoc, Dung Nguyen Duc, Luong Truong Minh, Thao Nguyen Thi Thach, Hiền Nguyễn Thị Thu
{"title":"SYNTHESIS OF SOME BENZOTHIAZOLE ANILINE DERIVATIVES AND THEIR BIOLOGICAL ACTIVITIES","authors":"Hoan Duong Quoc, Dung Nguyen Duc, Luong Truong Minh, Thao Nguyen Thi Thach, Hiền Nguyễn Thị Thu","doi":"10.18173/2354-1059.2022-0042","DOIUrl":"https://doi.org/10.18173/2354-1059.2022-0042","url":null,"abstract":"Three benzothiazole aniline derivatives 2a, 2b, and 2c were synthesized successfully by the reduction reaction of the respective nitro compound in neutral condition with Na2S2O4 in moderate yield. Structures of these derivatives were elucidated by IR, NMR, and MS analysis that referred to a strong agreement between spectral data and structures. Three compounds 2a, 2b, and 2c showed weak antioxidant, antibacterial and antifungal activities.","PeriodicalId":17007,"journal":{"name":"Journal of Science Natural Science","volume":"86 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85577530","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
PRESSURE DEPENDENCES OF LINE PARAMETERS OF THE 𝝂𝟑 + 𝝂𝟒 R(7)F1 TRANSITION OF METHANE DILUTED IN NITROGEN USING THE HARDAND SOFT-COLLISION MODELS 用硬碰撞模型和软碰撞模型研究氮稀释甲烷𝝂<s:1> +𝝂𝟒r (7) f1跃变线参数的压力依赖性
Journal of Science Natural Science Pub Date : 2022-10-01 DOI: 10.18173/2354-1059.2022-0041
Tuong Le Cong, Hoa Ngo Ngoc
{"title":"PRESSURE DEPENDENCES OF LINE PARAMETERS OF THE 𝝂𝟑 + 𝝂𝟒 R(7)F1 TRANSITION OF METHANE DILUTED IN NITROGEN USING THE HARDAND SOFT-COLLISION MODELS","authors":"Tuong Le Cong, Hoa Ngo Ngoc","doi":"10.18173/2354-1059.2022-0041","DOIUrl":"https://doi.org/10.18173/2354-1059.2022-0041","url":null,"abstract":"In this work, the affection of the Dicke narrowing effect on the spectral shape of the 𝜈3 + 𝜈4 R(7)F1 transition of methane diluted in nitrogen was studied using the Hard- and the Soft- collision line-shape models. Room-temperature absorption spectra of CH4 broadened by N2 were measured at a wide range of pressure using a difference-frequency laser spectrometer. Measured spectra of the studied transition were then one-by-one fitted with the simple Voigt profile as well as the two line-shape models considered the Dicke narrowing effect at two different assumptions of velocity-changing collisions: hard- and soft- collisions. The obtained results confirmed that using these two models leads to better qualities of fit with respect to the Voigt profile. Pressure-dependences of the line-shape parameters were also observed for the considered transition. The results showed a good agreement with other studies.","PeriodicalId":17007,"journal":{"name":"Journal of Science Natural Science","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79259268","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
STUDY FOR FERMION DARK MATTER PRODUCTION IN PHOTON-PHOTON COLLISION 光子-光子碰撞中费米子暗物质产生的研究
Journal of Science Natural Science Pub Date : 2022-10-01 DOI: 10.18173/2354-1059.2022-0039
{"title":"STUDY FOR FERMION DARK MATTER PRODUCTION IN PHOTON-PHOTON COLLISION","authors":"","doi":"10.18173/2354-1059.2022-0039","DOIUrl":"https://doi.org/10.18173/2354-1059.2022-0039","url":null,"abstract":"Fermion dark matter (FDM) production is investigated via photonphoton collision and the cross section of the FDM production is calculated in detail. Our results are evaluated at different values of the dark matter scale  and the light FDM mass.","PeriodicalId":17007,"journal":{"name":"Journal of Science Natural Science","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74005468","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
PRILIMINARY RESEARCH ON ACTIVITY BUDGET OF INDOCHINESE GREY LANGUR Trachypithecus crepusculus AT HANOI ZOO UNDER HUMAN INFLUENCE
Journal of Science Natural Science Pub Date : 2022-10-01 DOI: 10.18173/2354-1059.2022-0050
Vinh Nguyen Thanh, Dung Nguyen Thi Thuy
{"title":"PRILIMINARY RESEARCH ON ACTIVITY BUDGET OF INDOCHINESE GREY LANGUR Trachypithecus crepusculus AT HANOI ZOO UNDER HUMAN INFLUENCE","authors":"Vinh Nguyen Thanh, Dung Nguyen Thi Thuy","doi":"10.18173/2354-1059.2022-0050","DOIUrl":"https://doi.org/10.18173/2354-1059.2022-0050","url":null,"abstract":"Two individuals of Indochinese grey langur (Trachypithecus crepusculus) at Hanoi Zoo were studied from August 2014 to January 2015 with a total of 47 observation days and 4290 records to preliminarily determine their activity budget, food composition, and the influence of environmental factors including temperature, humidity, and human impact on their behaviours. The results show that there is a big difference between the activity budget of the two captive individuals and that of freeranging individuals. Furthermore, their food composition was also very different from that of individuals living in the wild and it may be the main reason. From this result, changing the composition of food for Indochinese grey langurs in Hanoi Zoo and limiting the visitors’ food provision needs to be carried out immediately to ensure the health and welfare of these langurs.","PeriodicalId":17007,"journal":{"name":"Journal of Science Natural Science","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85124517","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
STUDY ON THE ANTIBACTERIAL ABILITY OF THE HYBRID MATERIAL BETWEEN PORPHYRIN AND NANO SILVER 卟啉与纳米银杂化材料的抗菌性能研究
Journal of Science Natural Science Pub Date : 2022-10-01 DOI: 10.18173/2354-1059.2022-0045
Thao Vu Thi, Quyen Ha Thi, Khanh Phan Tan, Thuy Bui Thi Thu, Loc Nguyen Xuan, C. Nguyen Duc, Nam Nguyen Phuong Hoai, D.B. Berezin
{"title":"STUDY ON THE ANTIBACTERIAL ABILITY OF THE HYBRID MATERIAL BETWEEN PORPHYRIN AND NANO SILVER","authors":"Thao Vu Thi, Quyen Ha Thi, Khanh Phan Tan, Thuy Bui Thi Thu, Loc Nguyen Xuan, C. Nguyen Duc, Nam Nguyen Phuong Hoai, D.B. Berezin","doi":"10.18173/2354-1059.2022-0045","DOIUrl":"https://doi.org/10.18173/2354-1059.2022-0045","url":null,"abstract":"Water-soluble porphyrins di(4-aminophenyl)-di(4-sulfophenyl)- diphenyl-porphyrin [(SO3)2-TPP-(NH2)2](TASP) and nano-silver materials (AgNPs) were successfully synthesized by chemical synthesis and green synthesis from guava leaf extracts, respectively. The silver nanoparticle size is well controlled in the range of 1.1 - 1.5 nm. Then, AgNPsTASP hybrid materials were successfully synthesized by different mixing methods. The UV-Vis spectrum of the hybrid material depends on the AgNPs:TASP mixing ratio and still shows the Soret peaks and Q-bands characteristic of the porphyrin family and the broad absorption range from 300 - 600 nm of the silver nanoparticles initial. The results of an antibacterial test against both gram-negative and gram-positive strains on LB agar showed that all samples had different antibacterial activities. In which, the AgNPsTASP hybrid material has better inactivation ability than silver nano for both tested bacterial strains. Besides, the presence of polypyrrole conducting polymer (PPy) has promoted the kinetics of silver ion release, which also gives outstanding antibacterial results, thereby opening the potential to fabricate hybrid materials for antibacterial applications.","PeriodicalId":17007,"journal":{"name":"Journal of Science Natural Science","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91544488","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
NEW RECORDS ON DISTRIBUTION AND HOSTS OF Brachytarsina cucullata AND Raymondia pseudopagodarum (DIPTERA: STREBLIDAE) IN VIETNAM 文章标题越南短跗跗猴和伪长跗猴分布及寄主新记录(双翅目:链蝇科)
Journal of Science Natural Science Pub Date : 2022-10-01 DOI: 10.18173/2354-1059.2022-0048
Luong Nguyen Thanh, Loi Dao Nhan, Nha Pham Van, Viet Nguyen Van, Thinh Ta Huy, Sengmanichanh Phaly, Luong Nguyen Khanh, Nghia Nguyen Xuan, Ha Nguyen Manh, Toan Vu Duc, Thai Dinh Van, Thong Vu Dinh
{"title":"NEW RECORDS ON DISTRIBUTION AND HOSTS OF Brachytarsina cucullata AND Raymondia pseudopagodarum (DIPTERA: STREBLIDAE) IN VIETNAM","authors":"Luong Nguyen Thanh, Loi Dao Nhan, Nha Pham Van, Viet Nguyen Van, Thinh Ta Huy, Sengmanichanh Phaly, Luong Nguyen Khanh, Nghia Nguyen Xuan, Ha Nguyen Manh, Toan Vu Duc, Thai Dinh Van, Thong Vu Dinh","doi":"10.18173/2354-1059.2022-0048","DOIUrl":"https://doi.org/10.18173/2354-1059.2022-0048","url":null,"abstract":"Bat flies are highly specialized ectoparasites of the superfamily Hippoboscoidea and only associate with bats. They were rarely documented in Vietnam due to limited study in the country. Between 2017 and 2020, we conducted a series of field surveys in six localities in northern and central Vietnam with an emphasis on bat flies. Bats were captured using mist nets, harp traps, and handnets then morphologically identified following literatures relevant to the bats of each study site. Bat flies were collected using fine forceps and preserved in 70% alcohol for morphological identification. Twelve individuals of Brachytarsina cucullata and thirty-five individuals of Raymondia pseudopagodarum of the family Streblidae were collected over the surveys. Of which, B. cucullata is new to two localities in northern Vietnam (Nham Duong Mountain Area and Ha Long Bay) while R. pseudopagodarum is new to five localities in both northern and southern Vietnam (Bach Ma National Park, Cat Ba National Park, Ha Long Bay, Cu Lao Cham Island and Sop Cop Nature Reserve). Within Vietnam, B. cucullata and R. pseudopagodarum were only recorded from Cat Ba National Park and Vu Quang National Park, respectively. Notably, the previous records from Vietnam did not include either description or illustration. We here provide brief descriptions and illustrated photos of each species for morphological identification of these two bat fly species. A map showing the distributional records of each species is also included in this paper.","PeriodicalId":17007,"journal":{"name":"Journal of Science Natural Science","volume":"268 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76183612","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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