Pub Date : 1900-01-01DOI: 10.12677/ojns.2023.114078
慧林 王
{"title":"The Influence of Feeding Time and Surface Active Agents on Impact Microreactor in Powder Preparation","authors":"慧林 王","doi":"10.12677/ojns.2023.114078","DOIUrl":"https://doi.org/10.12677/ojns.2023.114078","url":null,"abstract":"","PeriodicalId":121138,"journal":{"name":"Open Journal of Natural Science","volume":"164 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123510314","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}
Pub Date : 1900-01-01DOI: 10.12677/ojns.2022.105090
慧鑫 杨
{"title":"Characteristics of Summer Precipitation and Climate Change in Southwest China in Recent 60 Years","authors":"慧鑫 杨","doi":"10.12677/ojns.2022.105090","DOIUrl":"https://doi.org/10.12677/ojns.2022.105090","url":null,"abstract":"","PeriodicalId":121138,"journal":{"name":"Open Journal of Natural Science","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127682666","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}
Pub Date : 1900-01-01DOI: 10.12677/ojns.2021.91010
慧 陈
{"title":"Research Progress and Synthesis of Metal Nanoparticles in Borosilicate Glass","authors":"慧 陈","doi":"10.12677/ojns.2021.91010","DOIUrl":"https://doi.org/10.12677/ojns.2021.91010","url":null,"abstract":"","PeriodicalId":121138,"journal":{"name":"Open Journal of Natural Science","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126481356","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}
Pub Date : 1900-01-01DOI: 10.12677/ojns.2020.84027
Yue Zhang, Tiangui Xiao, Juetao Zeng, Yu Du
In the context of global warming, extreme warming events occur frequently. In order to further study the spatial and temporal distribution characteristics of heat wave in southwest China, in this paper, linear trend analysis and Mann-Kendall test are used to study the spatial and temporal distribution of heat waves in southwest China. The 1979-2019 summer temperature data of European Centre for Medium-Range Weather Forecasts (ECMWF) are used. The following conclusions are drawn: Over the past 41 years, the frequency, duration and intensity of heat waves have shown a general trend of linear increase, with the rates of 0.09 times/10a, 0.37 d/10a and 0.44 ̊C∙d, respectively. From the mutation situation, before 2013, the frequency, duration and intensity of heat waves showed an increasing trend, but the increasing trend was not significant. After 2013, the frequency, duration and intensity of heat waves showed a significant increase trend. The spatial distribution of the frequency, duration and intensity of heat waves is more in the southeast and less in the northwest. The heat waves areas were concentrated in the central and eastern part of the study area, while the hot and heat wave events were rare in western Sichuan and southwestern Yunnan. Except for western Yunnan and western Sichuan, the frequency, duration and intensity of heat waves in the study area all showed an increasing trend. The central region of the study area had a larger increasing trend, and the regions that passed the 0.05 significance test were also concentrated in the central region.
{"title":"Study on Spatiotemporal Distribution Characteristics of High Temperature and Heat Waves in Southwest China from 1979 to 2019","authors":"Yue Zhang, Tiangui Xiao, Juetao Zeng, Yu Du","doi":"10.12677/ojns.2020.84027","DOIUrl":"https://doi.org/10.12677/ojns.2020.84027","url":null,"abstract":"In the context of global warming, extreme warming events occur frequently. In order to further study the spatial and temporal distribution characteristics of heat wave in southwest China, in this paper, linear trend analysis and Mann-Kendall test are used to study the spatial and temporal distribution of heat waves in southwest China. The 1979-2019 summer temperature data of European Centre for Medium-Range Weather Forecasts (ECMWF) are used. The following conclusions are drawn: Over the past 41 years, the frequency, duration and intensity of heat waves have shown a general trend of linear increase, with the rates of 0.09 times/10a, 0.37 d/10a and 0.44 ̊C∙d, respectively. From the mutation situation, before 2013, the frequency, duration and intensity of heat waves showed an increasing trend, but the increasing trend was not significant. After 2013, the frequency, duration and intensity of heat waves showed a significant increase trend. The spatial distribution of the frequency, duration and intensity of heat waves is more in the southeast and less in the northwest. The heat waves areas were concentrated in the central and eastern part of the study area, while the hot and heat wave events were rare in western Sichuan and southwestern Yunnan. Except for western Yunnan and western Sichuan, the frequency, duration and intensity of heat waves in the study area all showed an increasing trend. The central region of the study area had a larger increasing trend, and the regions that passed the 0.05 significance test were also concentrated in the central region.","PeriodicalId":121138,"journal":{"name":"Open Journal of Natural Science","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128043628","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}
Pub Date : 1900-01-01DOI: 10.12677/ojns.2022.103024
清芳 刘
Using upper-air sounding data since the use of the L-band-radar radiosonde at the Tacheng Na-tional Reference Station, based on tropopause meteorological data, this paper analyzes the characteristics and significance of tropopause, the determination of the tropopause, the selection method of the missing data in the part of tropopause, and the rational selection of several typical examples of tropopause in this station, and sums up the variation characteristics of tropopause, it provides a scientific basis for the study of weather and climate..
{"title":"Research on Tropopause Selection Method for High Altitude Sounding","authors":"清芳 刘","doi":"10.12677/ojns.2022.103024","DOIUrl":"https://doi.org/10.12677/ojns.2022.103024","url":null,"abstract":"Using upper-air sounding data since the use of the L-band-radar radiosonde at the Tacheng Na-tional Reference Station, based on tropopause meteorological data, this paper analyzes the characteristics and significance of tropopause, the determination of the tropopause, the selection method of the missing data in the part of tropopause, and the rational selection of several typical examples of tropopause in this station, and sums up the variation characteristics of tropopause, it provides a scientific basis for the study of weather and climate..","PeriodicalId":121138,"journal":{"name":"Open Journal of Natural Science","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129991764","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}
Pub Date : 1900-01-01DOI: 10.12677/ojns.2021.96095
迎国 王
{"title":"Research on Active Tectonic Geomorphic Parameters of Bahe River Basin Based on DEM","authors":"迎国 王","doi":"10.12677/ojns.2021.96095","DOIUrl":"https://doi.org/10.12677/ojns.2021.96095","url":null,"abstract":"","PeriodicalId":121138,"journal":{"name":"Open Journal of Natural Science","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130459528","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}
Pub Date : 1900-01-01DOI: 10.12677/ojns.2023.111007
彬彬 李
{"title":"Effect of MFT Nucleating Agent on Cell Structure and Physical Properties of Polyurethane Rigid Foam Cells","authors":"彬彬 李","doi":"10.12677/ojns.2023.111007","DOIUrl":"https://doi.org/10.12677/ojns.2023.111007","url":null,"abstract":"","PeriodicalId":121138,"journal":{"name":"Open Journal of Natural Science","volume":"183 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133405882","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}
Pub Date : 1900-01-01DOI: 10.12677/ojns.2022.104061
松林 朱
{"title":"MC Simulation Study of γ-Ray Spectral Distribution in Natural Radiation Field","authors":"松林 朱","doi":"10.12677/ojns.2022.104061","DOIUrl":"https://doi.org/10.12677/ojns.2022.104061","url":null,"abstract":"","PeriodicalId":121138,"journal":{"name":"Open Journal of Natural Science","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133430533","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}
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