Journal of Science Natural Science最新文献_第7页

Selecting and determining the weight of indicators in assessing vulnerability on the agricultural sector in Binh Dinh province due to climate change 在评估平定省农业部门因气候变化而遭受的脆弱性时选择和确定指标的权重

Journal of Science Natural Science Pub Date : 2022-03-01 DOI: 10.18173/2354-1059.2022-0014

Thuy Hoang Luu Thu

{"title":"Selecting and determining the weight of indicators in assessing vulnerability on the agricultural sector in Binh Dinh province due to climate change","authors":"Thuy Hoang Luu Thu","doi":"10.18173/2354-1059.2022-0014","DOIUrl":"https://doi.org/10.18173/2354-1059.2022-0014","url":null,"abstract":"The purpose of this study is to select and determine the weights of indicators in vulnerability assessment on the agricultural sector in Binh Dinh province by AHP - Analytic Hierarchy Process method with the support of Expert choice software. Indicators with large weights show the role and impact of those indicators in determining the value of the component variables: exposure index (E), sensitive index (S), and adaptive capacity index (AC). The results of the index calculation of the component variables taking into account the weights of the indicators will reflect more objective results when no weights are applied. Analysis of the value of the component index and the vulnerability index shows that: The degree of vulnerability to the agricultural sector in the coastal plain districts and near the sea is greater than that in the mountainous and midland districts. The degree of vulnerability to the agricultural sector of Binh Dinh province is low to very high, of which very high vulnerability is concentrated in coastal districts and near the sea including Hoai Nhon, Phu My, Phu Cat, and Tuy Phuoc districts; high vulnerability in An Lao and Hoai An districts; districts in the southwest of the province have low to moderate levels of vulnerability to the agricultural sector.","PeriodicalId":17007,"journal":{"name":"Journal of Science Natural Science","volume":"183 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74779018","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

Diffusion in metals Au, Cu, and interstitial alloys AuSi, CuSi 金属中的扩散:Au, Cu和间隙合金AuSi, CuSi

Journal of Science Natural Science Pub Date : 2022-03-01 DOI: 10.18173/2354-1059.2022-0004

Hoc Nguyen Quang, Hien Nguyen Duc, Hoa Nguyen Thi, H. Le Lan, Le Nguyen Ngoc

{"title":"Diffusion in metals Au, Cu, and interstitial alloys AuSi, CuSi","authors":"Hoc Nguyen Quang, Hien Nguyen Duc, Hoa Nguyen Thi, H. Le Lan, Le Nguyen Ngoc","doi":"10.18173/2354-1059.2022-0004","DOIUrl":"https://doi.org/10.18173/2354-1059.2022-0004","url":null,"abstract":"The paper performs numerically the vacancy activation volume, the activation energy, the pre-exponential factor, and the diffusion coefficient for metals Au, Cu, and alloys AuSi, CuSi in the interval of the concentration of interstitial atoms from zero to 4%, in the interval of temperature from 700 to 1873 K, in the interval of pressure from zero to 180 GPa and the interval of strain from zero to 5%. The paper determines the dependence of the diffusion coefficient on pressure and stress for above mentioned metals and alloys. SMM numerical results show that the Arrhenius law is satisfied for metals and interstitial alloys at different pressures and concentrations of interstitial atoms. SMM numerical results for Au at T = 1000 K and T = 1250 K and at zero pressure are in good agreement with experiments for the activation energy (errors are below 10%) and agree in terms of magnitude for the pre-exponential factor and the diffusion coefficient. SMM numerical results of the diffusion coefficient for Au in the interval of temperature from 977 to 1321 K and for Cu in the interval of temperature from 933.95 to 1336.15 K are compared with experiments and other calculations and there are rather good agreement in terms of magnitude. SMM numerical results of the activation volume of Au and Cu agree well with other calculations. SMM numerical results for diffusion quantities of interstitial alloys AuSi, CuSi in different temperatures, pressures, stresses, and concentrations of interstitial atoms anticipate and orient experiments in the future.","PeriodicalId":17007,"journal":{"name":"Journal of Science Natural Science","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80719647","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

A study on drought in Hai Duong province during dry months in the context of climate change 气候变化背景下海阳省旱季干旱研究

Journal of Science Natural Science Pub Date : 2022-03-01 DOI: 10.18173/2354-1059.2022-0015

Hung Dao Ngoc, Thuy Hoang Luu Thu, Thao Nguyen Duong, Thu Hien Doan Thi

{"title":"A study on drought in Hai Duong province during dry months in the context of climate change","authors":"Hung Dao Ngoc, Thuy Hoang Luu Thu, Thao Nguyen Duong, Thu Hien Doan Thi","doi":"10.18173/2354-1059.2022-0015","DOIUrl":"https://doi.org/10.18173/2354-1059.2022-0015","url":null,"abstract":"Hai Duong is a province in the Red River Delta with a GDP of 3020 USDyear. Its economy depends heavily on natural conditions, especially in the agricultural sector. In the context of climate change, drought will be a natural disaster that greatly affects the economy - especially agriculture. Using the correlation evaluation method and building complex regression equations, a good correlation was found between the total evaporation with the total monthly rainfall, monthly mean temperature, monthly mean maximum temperature, and monthly minimum temperature. This is the basis for calculating potential future evaporation based on climate change and sea level rise scenarios. Using the method of calculating the drought index K using the input data of climate change and sea level rise scenarios for Vietnam, the study has calculated the drought evolution for the three driest months of the year (12, 1, 2) for the period 2021 - 2050 in Hai Duong province. The results show that with both scenarios RCP 4.5 and RCP 8.5, the drought index is at arid and very arid levels. The drought level in the RCP 8.5 scenario is higher than in the RCP 4.5 scenario, the drought level at Chi Linh meteorological station is 1.4 - 1.5 times higher than the drought level at Hai Duong meteorological station and especially, the drought is cyclical with the scenario RCP 8.5, which shows the maximum every 9 - 10 years.","PeriodicalId":17007,"journal":{"name":"Journal of Science Natural Science","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78231160","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

Assessment of heat stress change in Hanoi city 河内市热应力变化评估

Journal of Science Natural Science Pub Date : 2022-03-01 DOI: 10.18173/2354-1059.2022-0013

Hung Dao Ngoc, Thuy Hoang Luu Thu, Thao Dang Bich, Thao Tran Thi

{"title":"Assessment of heat stress change in Hanoi city","authors":"Hung Dao Ngoc, Thuy Hoang Luu Thu, Thao Dang Bich, Thao Tran Thi","doi":"10.18173/2354-1059.2022-0013","DOIUrl":"https://doi.org/10.18173/2354-1059.2022-0013","url":null,"abstract":"Hanoi is the second-largest city in Vietnam, with rapid urbanization, high population density and continuously increasing people's income. However, due to climate change and urbanization, heat stress is becoming more and more serious, affecting public health. This study used the method of calculating effective temperature (ET) to evaluate the spatial and temporal variation of heat stress in Hanoi city from the period 1961 to 2020. Calculation results of the ET value showed that the ET at the hot and fairly hot level was mainly concentrated in June, July, and August. ET tends to increase markedly over time. During the period 1961 - 1997, there was almost no hot ET, but from 1998 to the present, the number of hot ET months occurs frequently in June and July. The number of hot months in the downtown area of Hanoi is much higher than in the surrounding areas. With such a trend in the future, the months of June and July will always have hot ET. The research results are useful documents for management agencies and the health sector to take specific actions to strengthen the health care system, develop infrastructure, and inform the community about the risk of heat stress.","PeriodicalId":17007,"journal":{"name":"Journal of Science Natural Science","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83581345","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

Determination of some suitable technology conditions to improve recovery performance of Morinda citrifolia L. juice 确定了提高桑椹汁回收率的适宜工艺条件

Journal of Science Natural Science Pub Date : 2022-03-01 DOI: 10.18173/2354-1059.2022-0006

Loi Nguyen Van

引用次数: 0

Using Holiday Climate Index to assess the favorable climate for tourism development in some locals of Southern Vietnam 利用假日气候指数评估越南南部一些地方旅游发展的有利气候

Journal of Science Natural Science Pub Date : 2022-03-01 DOI: 10.18173/2354-1059.2022-0016

Oanh Hoang Thi Kieu, Loi Le Huu

引用次数: 0

New morphological and acoustic records of Myotis species (Mammalia: Chiroptera: Vespertilionidae) from northern Vietnam 文章标题越南北部鼠虻属新种(哺乳纲:翼翅目:鼠虻科)的形态学和声学记录

Journal of Science Natural Science Pub Date : 2022-03-01 DOI: 10.18173/2354-1059.2022-0007

Toan Vu Duc, Loi Dao Nhan

引用次数: 0

Four proofs for Pappus’s theorem 帕普斯定理的四个证明

Journal of Science Natural Science Pub Date : 2022-03-01 DOI: 10.18173/2354-1059.2022-0001

Anh Tran Duc

引用次数: 0

Density effects on microstructures and mechanical behavior of (AlN)0.9(Si3N4)0.1 ceramic 密度对(AlN)0.9(Si3N4)0.1陶瓷显微组织和力学行为的影响

Journal of Science Natural Science Pub Date : 2022-03-01 DOI: 10.18173/2354-1059.2022-0003

Thao Nguyen Thi, Vinh Le Van

引用次数: 0

Preliminary data on terrestrial snails (Mollusca: Gastropoda) in Pu Mat National Park, Nghe An Province, Vietnam 文章题目越南义安省蒲马国家公园陆生蜗牛(软体纲:腹足纲)初步资料

Journal of Science Natural Science Pub Date : 2022-03-01 DOI: 10.18173/2354-1059.2022-0009

Sang Do Duc, Sơn Nguyễn Thành, Lan Do Hai

引用次数: 0