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Gross β activity level of fallout in the environment around Qinshan Nuclear Power Plant
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作者 YEJi-Da CHENBin WUZong-Mei 《Nuclear Science and Techniques》 SCIE CAS CSCD 2005年第1期43-45,共3页
This paper presents the measurement results of gross β activities in fallout samples collected from the en- vironment around Qinshan Nuclear Power Plant (NPP) during 1993-2002. The gross β activity of 191 samples co... This paper presents the measurement results of gross β activities in fallout samples collected from the en- vironment around Qinshan Nuclear Power Plant (NPP) during 1993-2002. The gross β activity of 191 samples col- lected at five monitoring spots were (0.11~3.64) Bq·m-2·d-1, with an average of (0.91±0.49) Bq·m-2·d-1. This value was lower than (1.02±0.35) Bq?m-2?d-1 , the average of the samples collected at the reference spot in Hangzhou. It indicated that no obvious rise in the gross β activity level of fallout was observed in ambience of Qinshan NPP. 展开更多
关键词 秦山核电站 放射性监测 辐射微尘 β活性
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Activity level of gross α and gross β in airborne aerosol samples around the Qinshan NPP
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作者 CHEN Bin YE Jida CHEN Qianyuan WU Xiaofei SONG Weili WANG Hongfeng 《Nuclear Science and Techniques》 SCIE CAS CSCD 2007年第3期176-180,共5页
The monitoring results of gross α and gross β activity from 2001 to 2005 for environmental airborne aero- sol samples around the Qinshan NPP base are presented in this paper. A total of 170 aerosol samples were coll... The monitoring results of gross α and gross β activity from 2001 to 2005 for environmental airborne aero- sol samples around the Qinshan NPP base are presented in this paper. A total of 170 aerosol samples were collected from monitoring sites of Caichenmen village, Qinlian village, Xiajiawan village and Yangliucun village around the Qinshan NPP base. The measured specific activity of gross α and gross β are in the range of 0.02~0.38 mBq/m3 and 0.10~1.81 mBq/m3, respectively, with an average of 0.11 mBq/m3 and 0.45mBq/m3, respectively. They are lower than the average of 0.15 mBq/m3 and 0.52mBq/m3, of reference site at Hangzhou City. It is indicated that the specific activity of gross α and gross β for environmental aerosol samples around the Qinshan NPP base had not been in- creased in normal operating conditions of the NPP. 展开更多
关键词 环境放射性 气溶胶 过失误差α 过失误差β
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基于Gross理论的农村青年群体心理类APP交互设计研究
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作者 尧优生 潘锡勤 +3 位作者 熊强 叶苹 唐娥 郑俊鹏 《包装工程》 CAS 北大核心 2024年第22期510-520,共11页
目的基于Gross理论解决农村青年大学生心理问题,以APP为载体与用户进行互动从而调节用户情绪。方法通过文献研究、问卷调查和用户访谈,对当代农村青年大学生心理问题进行深入分析和研究,进而从Gross情绪调节理论的角度,对农村青年大学... 目的基于Gross理论解决农村青年大学生心理问题,以APP为载体与用户进行互动从而调节用户情绪。方法通过文献研究、问卷调查和用户访谈,对当代农村青年大学生心理问题进行深入分析和研究,进而从Gross情绪调节理论的角度,对农村青年大学生在不同情境下的情绪状态进行深入挖掘,从而进行需求分析,逐步转化为对应的功能点,并基于Gross理论和APP交互设计构建模型来输出设计方案。最后,运用李克特五分量表进行方案的可用性评估,并采用积极情绪与消极情绪量表(PANAS)进行用户积极情绪变化的验证。结论将Gross情绪调节理论引入心理类APP的交互设计中,创造出一款情绪调节的APP。经过用户测试,能够有效改善用户的情绪问题,帮助他们更好地管理情绪,同时也为其他同类APP的设计提供了参考和借鉴。另外,在研究过程中,验证了Gross理论的有效性和设计策略的合理性,为今后的进一步推广和理论应用提供了借鉴。 展开更多
关键词 gross理论 农村青年群体 情绪调节 心理类APP APP交互设计
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Spatiotemporal changes of gross primary productivity and its response to drought in the Mongolian Plateau under climate change 被引量:1
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作者 ZHAO Xuqin LUO Min +3 位作者 MENG Fanhao SA Chula BAO Shanhu BAO Yuhai 《Journal of Arid Land》 SCIE CSCD 2024年第1期46-70,共25页
Gross primary productivity(GPP)of vegetation is an important constituent of the terrestrial carbon sinks and is significantly influenced by drought.Understanding the impact of droughts on different types of vegetation... Gross primary productivity(GPP)of vegetation is an important constituent of the terrestrial carbon sinks and is significantly influenced by drought.Understanding the impact of droughts on different types of vegetation GPP provides insight into the spatiotemporal variation of terrestrial carbon sinks,aiding efforts to mitigate the detrimental effects of climate change.In this study,we utilized the precipitation and temperature data from the Climatic Research Unit,the standardized precipitation evapotranspiration index(SPEI),the standardized precipitation index(SPI),and the simulated vegetation GPP using the eddy covariance-light use efficiency(EC-LUE)model to analyze the spatiotemporal change of GPP and its response to different drought indices in the Mongolian Plateau during 1982-2018.The main findings indicated that vegetation GPP decreased in 50.53% of the plateau,mainly in its northern and northeastern parts,while it increased in the remaining 49.47%area.Specifically,meadow steppe(78.92%)and deciduous forest(79.46%)witnessed a significant decrease in vegetation GPP,while alpine steppe(75.08%),cropland(76.27%),and sandy vegetation(87.88%)recovered well.Warming aridification areas accounted for 71.39% of the affected areas,while 28.53% of the areas underwent severe aridification,mainly located in the south and central regions.Notably,the warming aridification areas of desert steppe(92.68%)and sandy vegetation(90.24%)were significant.Climate warming was found to amplify the sensitivity of coniferous forest,deciduous forest,meadow steppe,and alpine steppe GPP to drought.Additionally,the drought sensitivity of vegetation GPP in the Mongolian Plateau gradually decreased as altitude increased.The cumulative effect of drought on vegetation GPP persisted for 3.00-8.00 months.The findings of this study will improve the understanding of how drought influences vegetation in arid and semi-arid areas. 展开更多
关键词 gross primary productivity(GPP) climate change warming aridification areas drought sensitivity cumulative effect duration(CED) Mongolian Plateau
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基于Gross情绪调节理论的心理护理对耐药结核病患者心理应激、治疗依从性及生活质量的影响
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作者 邵丽波 崔晓华 +2 位作者 孙艳芳 张亢亢 杨莉 《医学理论与实践》 2024年第5期852-854,共3页
目的:探讨基于Gross情绪调节理论的心理护理对耐药结核病(DR-TB)患者心理应激水平、治疗依从性及生活质量的影响。方法:使用随机数表法将2022年1—12月在我院就诊的80例DR-TB患者分为对照组(n=40)和观察组(n=40)。对照组给予常规护理,... 目的:探讨基于Gross情绪调节理论的心理护理对耐药结核病(DR-TB)患者心理应激水平、治疗依从性及生活质量的影响。方法:使用随机数表法将2022年1—12月在我院就诊的80例DR-TB患者分为对照组(n=40)和观察组(n=40)。对照组给予常规护理,观察组给予在常规护理基础上基于Gross情绪调节理论的心理护理。比较两组心理应激水平、治疗依从性及生活质量。结果:干预后,两组BDI、BAI评分均下降,且观察组BDI、BAI评分均低于对照组(P<0.05);观察组MMAS-8评分高于对照组(P<0.05);干预后,两组QLI-TB评分均上升,且观察组QLI-TB评分高于对照组(P<0.05)。结论:基于Gross情绪调节理论的心理护理能有效改善DR-TB患者焦虑、抑郁情绪,对提高患者治疗依从性及生活质量有较大意义。 展开更多
关键词 耐药结核病 gross情绪调节理论 心理应激 治疗依从性 生活质量
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Safety and efficacy of transcatheter arterial embolization in autosomal dominant polycystic kidney patients with gross hematuria: Six case reports
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作者 Wei-Fan Sui Yun-Xin Duan +2 位作者 Jian-Yun Li Wei-Bin Shao Jian-Hua Fu 《World Journal of Clinical Cases》 SCIE 2024年第11期1954-1959,共6页
BACKGROUND To retrospectively report the safety and efficacy of renal transcatheter arterial embolization for treating autosomal dominant polycystic kidney disease(ADPKD)patients with gross hematuria.CASE SUMMARY The ... BACKGROUND To retrospectively report the safety and efficacy of renal transcatheter arterial embolization for treating autosomal dominant polycystic kidney disease(ADPKD)patients with gross hematuria.CASE SUMMARY The purpose of this study is to retrospectively report the safety and efficacy of renal transcatheter arterial embolization for treating ADPKD patients with gross hematuria.Materials and methods:During the period from January 2018 to December 2019,renal transcatheter arterial embolization was carried out on 6 patients with polycystic kidneys and gross hematuria.Renal arteriography was performed first,and then we determined the location of the hemorrhage and performed embolization under digital subtraction angiography monitoring.Improvements in routine blood test results,routine urine test results,urine color and postoperative reactions were observed and analyzed.Results:Renal transcatheter arterial embolization was successfully conducted in 6 patients.The indices of 5 patients and the color of gross hematuria improved after surgery compared with before surgery.No severe complication reactions occurred.CONCLUSION For autosomal dominant polycystic kidney syndrome patients with gross hematuria,transcatheter arterial embolization was safe and effective. 展开更多
关键词 Renal artery Autosomal dominant polycystic kidney disease gross hematuria Interventional radiology EMBOLIZATION Case report
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Effect of VOJTA Therapy on Gross Motor Function in Children with Cerebral Palsy
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作者 Tian Ma Ceng Li Yabo Liu 《Open Journal of Pediatrics》 2024年第2期359-363,共5页
Objective: To investigate the effect of VOJTA therapy on gross motor function in children with cerebral palsy. Methods: The 86 children with cerebral palsy were all from the First People’s Hospital of Jingzhou City f... Objective: To investigate the effect of VOJTA therapy on gross motor function in children with cerebral palsy. Methods: The 86 children with cerebral palsy were all from the First People’s Hospital of Jingzhou City from January 2023-December 2023, and were divided into the control group and the study group with 43 cases according to the principle of voluntariness. Results: In terms of total effective rate of treatment, the gross motor function scale-88 (GMFM-88) was used to evaluate the effective rate before and after treatment, and the effective rate of the study group was higher than that of the control group, and the difference was statistically significant, and the scores of gross motor items of GMFM-88 were better than those of the control group after treatment, and the difference was statistically significant (P 0.05). Conclusion: The application of VOJTA therapy in the treatment of children with cerebral palsy can not only promote the rehabilitation of gross motor function, but also help to improve the treatment effect, and the earlier the treatment, the better. 展开更多
关键词 VOJTA Therapy Children with Cerebral Palsy gross Motor Function
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Gross Alpha and Beta Activities and Related Lifetime Risks Assessment Due to Ingestion of Drinking Water from Different Sources in the District of Abidjan, Cote d’Ivoire
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作者 Ponaho Claude Kezo Issa Konate Dabo Salif Ignace Agba 《World Journal of Nuclear Science and Technology》 CAS 2024年第1期86-96,共11页
Drinking good quality water is essential for better health. It is therefore essential to assess the radiological quality of all water consumed in the District of Abidjan in order to prevent related hazards. Thus, the ... Drinking good quality water is essential for better health. It is therefore essential to assess the radiological quality of all water consumed in the District of Abidjan in order to prevent related hazards. Thus, the objective of this study was to assess the risk of cancer due to the ingestion of alpha and beta emitting radionuclides in the different types of water consumed in the region. A total of 63 water samples with 43 tap water samples, 5 bottled mineral water and 15 sachet water samples was collected and taken to GAEC laboratory for analysis. The low background Gas-less Automatic Alpha/Beta counting system (Canberra iMatic<sup>TM</sup>) was used to determine alpha and beta activity concentrations. Activity concentrations of both gross alpha and gross beta obtained in water sample were respectively lower than the WHO recommended limits of 0.1 Bq/l and 1 Bq/l. Also, the annual effective dose and total equivalent effective dose found in mineral bottled water samples were higher than in other types of water. The assessment of radiological lifetime risk has shown values of cancer risk due to ingestion alpha and beta emitters lower than recommended limit. These results indicate that there is no health hazard associated to consumption of water in the District of Abidjan. 展开更多
关键词 gross Alpha and Beta Activities Drinking Water Effective Dose Radiological Lifetime Risks
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Public Effective Dose Assessment Using Gross Alpha and Beta Radioactivity Levels of Tap Drinking Water in the District of Abidjan, Cote d’Ivoire
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作者 Ponaho Claude Kezo Issa Konate Tekpo Paul Dali 《Journal of Environmental Protection》 CAS 2023年第3期127-138,共12页
In order to assess public effective dose due to gross alpha and beta in water, 43 tap water samples were collected from different areas in the District of Abidjan. Using the low background Gas-less Automatic Alpha/Bet... In order to assess public effective dose due to gross alpha and beta in water, 43 tap water samples were collected from different areas in the District of Abidjan. Using the low background Gas-less Automatic Alpha/Beta counting system (Canberra iMatic<sup>TM</sup>) for analysis, the gross alpha and beta concentrations found varied from 0.001 ± 0.002 to 0.063 ± 0.050 Bq/l with an average of 0.013 ± 0.012 Bq/l and from 0.067 ± 0.080 to 0.320 ± 0.120 Bq/l with an average of 0.174 ± 0.076 Bq/l, respectively in samples. The public effective dose assessment showed values of dose to ingestion of alpha and beta emitter radionuclides lower than the recommended value of dose for drinking water 0.1 mSv/y, except in 30% of the samples. These results show the need for additional studies to be conducted in order to clarify the hazardousness of these water samples. However, this study still remains important because it has provided necessary data for future tap water quality monitoring studies in the District of Abidjan. 展开更多
关键词 gross Alpha and Beta Concentration Tap Water Effective Dose District of Abidjan
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Interrupted Time Series Analysis of Military and Civilian Regimes in Nigeria: A Statistical Evidence from Gross Domestic Product (GDP)
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作者 Desmond Chekwube Bartholomew Geoffrey Uzodinma Ugwuanyim +1 位作者 Ukamaka Cynthia Orumie Francis Attah Egwumah 《Open Journal of Endocrine and Metabolic Diseases》 2023年第4期635-660,共26页
Governments influence the economy by changing the level and types of taxes, the extent and composition of spending, and the degree and form of borrowing. Governments directly and indirectly influence the way resources... Governments influence the economy by changing the level and types of taxes, the extent and composition of spending, and the degree and form of borrowing. Governments directly and indirectly influence the way resources are used in the economy. Higher taxes, fees, and greater regulations can stymie businesses or entire industries and the resulting impact is reflected on the country’s economy status (strong or weak). The growth rate of GDP is often used as an indicator of the general health of the economy. In broad terms, an increase in real GDP is interpreted as a sign that the economy is doing well. So it is important to study and pay more attention to country’s GDP growth rate. In this paper, an intervention analysis approach was applied to Nigeria GDP data in order to evaluate the performances of military and civilian rules in the country. Data on Nigeria GDP were collected and subjected to interrupted (intervention) time series model. Based on the Alkaike Information Criterion (AIC), Bayesian Information Criterion (BIC) and sigma<sup>2</sup> values, the interrupted time series model ARIMA (1, 1, 0) with exogenous variables (per capita per capita GDP, intervention, year and yearAfter) was identified as the best model amongst other competing models. It was observed that the intervention (civilian rule) was significant at the 10% level of significance in increasing the Nigeria GDP by 10B US$ on the average since 2005 till 2021 while controlling for the effects of other determinants. Also, the ARIMA (1, 1, 0) forecasts indicate that the Nigeria GDP will continue increasing during the civilian rule. As a result, changing from military rule to civilian rule in Nigeria significantly increased the GDP of the country. 展开更多
关键词 ARIMA FORECAST gross Domestic Product NIGERIA INTERVENTION Interrupted Time Series
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Interrupted Time Series Analysis of Military and Civilian Regimes in Nigeria: A Statistical Evidence from Gross Domestic Product (GDP)
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作者 Desmond Chekwube Bartholomew Geoffrey Uzodinma Ugwuanyim +1 位作者 Ukamaka Cynthia Orumie Francis Attah Egwumah 《Open Journal of Statistics》 2023年第4期635-660,共26页
Governments influence the economy by changing the level and types of taxes, the extent and composition of spending, and the degree and form of borrowing. Governments directly and indirectly influence the way resources... Governments influence the economy by changing the level and types of taxes, the extent and composition of spending, and the degree and form of borrowing. Governments directly and indirectly influence the way resources are used in the economy. Higher taxes, fees, and greater regulations can stymie businesses or entire industries and the resulting impact is reflected on the country’s economy status (strong or weak). The growth rate of GDP is often used as an indicator of the general health of the economy. In broad terms, an increase in real GDP is interpreted as a sign that the economy is doing well. So it is important to study and pay more attention to country’s GDP growth rate. In this paper, an intervention analysis approach was applied to Nigeria GDP data in order to evaluate the performances of military and civilian rules in the country. Data on Nigeria GDP were collected and subjected to interrupted (intervention) time series model. Based on the Alkaike Information Criterion (AIC), Bayesian Information Criterion (BIC) and sigma<sup>2</sup> values, the interrupted time series model ARIMA (1, 1, 0) with exogenous variables (per capita per capita GDP, intervention, year and yearAfter) was identified as the best model amongst other competing models. It was observed that the intervention (civilian rule) was significant at the 10% level of significance in increasing the Nigeria GDP by 10B US$ on the average since 2005 till 2021 while controlling for the effects of other determinants. Also, the ARIMA (1, 1, 0) forecasts indicate that the Nigeria GDP will continue increasing during the civilian rule. As a result, changing from military rule to civilian rule in Nigeria significantly increased the GDP of the country. 展开更多
关键词 ARIMA FORECAST gross Domestic Product NIGERIA INTERVENTION Interrupted Time Series
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基于Gross认知重评的机器人认知情感交互模型 被引量:14
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作者 韩晶 解仑 +2 位作者 刘欣 徐上谋 王志良 《东南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2015年第2期270-274,共5页
为了增强机器人的认知情感分析能力,依据AVS情感空间和有限状态机(FSM)提出了一种基于Gross认知重评策略的认知情感交互模型.首先,通过分析情感状态之间的欧式距离,研究外界情感刺激对情感状态转移概率的影响;然后,采用有限状态机描述... 为了增强机器人的认知情感分析能力,依据AVS情感空间和有限状态机(FSM)提出了一种基于Gross认知重评策略的认知情感交互模型.首先,通过分析情感状态之间的欧式距离,研究外界情感刺激对情感状态转移概率的影响;然后,采用有限状态机描述了受到认知重评策略影响的情感状态转移过程;最后,根据情感状态转移概率和7种基本情感的空间坐标,得出受到刺激后机器人情感状态的空间位置.实验结果表明,与不受认知重评策略影响的情感交互模型相比,所提模型能够减少机器人对外界情感刺激的依赖,从而有效地促进了和谐的人机交互体验. 展开更多
关键词 认知情感交互模型 情感状态转移概率 gross认知重评 AVS情感空间 有限状态机
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亚纯函数唯一性的Gross问题 被引量:2
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作者 宋国栋 李农 《数学年刊(A辑)》 CSCD 北大核心 1996年第2期189-194,共6页
F.Gross提出问题:能否找到两个(甚至一个)有穷集会Sj(j=1;2),使得满足Ef(Sj)=Eg(Sj)(j=1,2)的任何两个整函数f和g必定恒等,这里Ef(Sj)表示Sj关于f的逆像,计重数.仅供助[6]对于亚纯函f,和g对此问题作了肯定的回... F.Gross提出问题:能否找到两个(甚至一个)有穷集会Sj(j=1;2),使得满足Ef(Sj)=Eg(Sj)(j=1,2)的任何两个整函数f和g必定恒等,这里Ef(Sj)表示Sj关于f的逆像,计重数.仅供助[6]对于亚纯函f,和g对此问题作了肯定的回答.本文以(S)和(S)代替EF(S)和Eg(S),对这个问题作了进一步的讨论,这里(S)是与Ef(S)相同的点集,但不计重教. 展开更多
关键词 整函数 唯一性 半纯函数 gross问题
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关于Gross问题的一个注记 被引量:7
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作者 方明亮 徐万松 《数学年刊(A辑)》 CSCD 北大核心 1997年第5期563-568,共6页
本文研究亚纯函数的唯一性,得到了如下结果.设S={z:z3-z2-1=0},f(z)与g(z)是满足Θ(∞,f)>12,Θ(∞,g)>12,的两个非常数亚纯函数.若E(0,f)=E(0,g),E(S,f)=E(S,g... 本文研究亚纯函数的唯一性,得到了如下结果.设S={z:z3-z2-1=0},f(z)与g(z)是满足Θ(∞,f)>12,Θ(∞,g)>12,的两个非常数亚纯函数.若E(0,f)=E(0,g),E(S,f)=E(S,g)以及E(∞,f)=E(∞,g),则f(z)≡g(z). 展开更多
关键词 亚纯函数 整函数 唯一性 gross问题 值分布
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Influence of vapor pressure deficit on vegetation growth in China 被引量:1
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作者 LI Chuanhua ZHANG Liang +3 位作者 WANG Hongjie PENG Lixiao YIN Peng MIAO Peidong 《Journal of Arid Land》 SCIE CSCD 2024年第6期779-797,共19页
Vapor pressure deficit(VPD)plays a crucial role in determining plant physiological functions and exerts a substantial influence on vegetation,second only to carbon dioxide(CO_(2)).As a robust indicator of atmospheric ... Vapor pressure deficit(VPD)plays a crucial role in determining plant physiological functions and exerts a substantial influence on vegetation,second only to carbon dioxide(CO_(2)).As a robust indicator of atmospheric water demand,VPD has implications for global water resources,and its significance extends to the structure and functioning of ecosystems.However,the influence of VPD on vegetation growth under climate change remains unclear in China.This study employed empirical equations to estimate the VPD in China from 2000 to 2020 based on meteorological reanalysis data of the Climatic Research Unit(CRU)Time-Series version 4.06(TS4.06)and European Centre for Medium-Range Weather Forecasts(ECMWF)Reanalysis 5(ERA-5).Vegetation growth status was characterized using three vegetation indices,namely gross primary productivity(GPP),leaf area index(LAI),and near-infrared reflectance of vegetation(NIRv).The spatiotemporal dynamics of VPD and vegetation indices were analyzed using the Theil-Sen median trend analysis and Mann-Kendall test.Furthermore,the influence of VPD on vegetation growth and its relative contribution were assessed using a multiple linear regression model.The results indicated an overall negative correlation between VPD and vegetation indices.Three VPD intervals for the correlations between VPD and vegetation indices were identified:a significant positive correlation at VPD below 4.820 hPa,a significant negative correlation at VPD within 4.820–9.000 hPa,and a notable weakening of negative correlation at VPD above 9.000 hPa.VPD exhibited a pronounced negative impact on vegetation growth,surpassing those of temperature,precipitation,and solar radiation in absolute magnitude.CO_(2) contributed most positively to vegetation growth,with VPD offsetting approximately 30.00%of the positive effect of CO_(2).As the rise of VPD decelerated,its relative contribution to vegetation growth diminished.Additionally,the intensification of spatial variations in temperature and precipitation accentuated the spatial heterogeneity in the impact of VPD on vegetation growth in China.This research provides a theoretical foundation for addressing climate change in China,especially regarding the challenges posed by increasing VPD. 展开更多
关键词 vapor pressure deficit(VPD) near-infrared reflectance of vegetation(NIRv) leaf area index(LAI) gross primary productivity(GPP) Climatic Research Unit(CRU)Time-Series version 4.06(TS4.06) European Centre for Medium-Range Weather Forecasts(ECMWF)Reanalysis 5(ERA-5) climate change
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Gross-Pitaevskii方程的复行波解 被引量:1
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作者 相春环 王洪雷 《量子电子学报》 CAS CSCD 北大核心 2008年第2期151-154,共4页
Hyperbolic tangent法是研究非线性微分方程的有力工具,通过利用hyperbolic tangent法得到非线性Gross-Pitaevskii方程的复行波解。
关键词 非线性方程 复行波解 HYPERBOLIC tangent法 gross—Pitaevskii方程
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耦合Gross-Pitaevskii方程的变分原理 被引量:1
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作者 李冠强 彭娉 《西北师范大学学报(自然科学版)》 CAS 北大核心 2009年第5期44-47,共4页
运用半反推方法,首次对耦合Gross-Pitaevskii方程进行变分分析,建立了一个简单的变分公式,其耦合项来源于不同分量之间的交叉相互作用.该公式为通过变分迭代寻求两分量玻色凝聚体中新型孤立波解提供了一个理论依据.
关键词 耦合gross—Pitaevskii方程 变分原理 半反推法
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Influences of tree characters on throughfall and stemflow from rainfall and fog in Popa Mountain Park, Myanmar
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作者 Yadanar Zaw Hiroki Oue 《Journal of Forestry Research》 SCIE EI CAS CSCD 2024年第6期210-219,共10页
Available water for communities is insufficient in the central part of Myanmar due to limited rainfall and surface water resources.Over the last two decades,affores-tation and reforestation projects have been implemen... Available water for communities is insufficient in the central part of Myanmar due to limited rainfall and surface water resources.Over the last two decades,affores-tation and reforestation projects have been implemented in this region to provide sufficient water to local communities,expecting forested areas to store more rainwater than other land uses.However,there has been no research and very limited information on rainfall partitioning into throughfall(TF)and stemflow(SF),particularly concerning tree char-acters.Gross rainfall,TF under different canopy types,and SF of different tree types were measured in 2019.TF and SF were frequently observed even without rain but under foggy conditions.Therefore,both were partitioned into TF and SF from rainfall and fog individually.Sparser canopies resulted in larger TF from rainfall than denser canopies.However,a denser canopy delivered larger TF from fog than a sparser one.TF rates from rainfall in sparser and denser canopies were 54.5%and 51.5%,respectively,while those from fog were 15.2%and 27.2%,respectively.As a result,total TF rate in the denser canopy(70.7%)was significantly larger than that from the sparser one(64.3%).Short trees with small crown projection area and smooth bark(Type I)resulted in larger SF from rainfall than taller trees with large crown projection area and rough bark(Type II).How-ever,Type II trees resulted in larger SF from fog.SF rates by rainfall from Type I and II trees were 17.5%and 12.2%,respectively,while those by fog were 22.2%and 39.5%,respectively.No significant total SF rates were found for Type I(22.5%)and II trees(20.1%).A denser canopy results in larger TF,and Type I trees result in larger SF.In an area where foggy conditions occur frequently and for a lengthy period,however,Type II trees will result in larger SF.These three tree characters(dense canopies,short trees with small crown projection area and smooth bark,and tall trees with large crown projection area and rough bark)should be con-sidered for afforestation and reforestation projects in the Popa Mountain Park to enhance net water input by forests. 展开更多
关键词 gross rainfall Fog interception THROUGHFALL STEMFLOW
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Analysis of radiation diffusion of COVID-19 driven by social attributes
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作者 年福忠 杨晓晨 师亚勇 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第1期773-779,共7页
This paper first estimated the infectious capacity of COVID-19 based on the time series evolution data of confirmed cases in multiple countries. Then, a method to infer the cross-regional spread speed of COVID-19 was ... This paper first estimated the infectious capacity of COVID-19 based on the time series evolution data of confirmed cases in multiple countries. Then, a method to infer the cross-regional spread speed of COVID-19 was introduced in this paper, which took the gross domestic product(GDP) of each region as one of the factors that affect the spread speed of COVID-19 and studied the relationship between the GDP and the infection density of each region(China's Mainland, the United States, and EU countries). In addition, the geographic distance between regions was also considered in this method and the effect of geographic distance on the spread speed of COVID-19 was studied. Studies have shown that the probability of mutual infection of these two regions decreases with increasing geographic distance. Therefore, this paper proposed an epidemic disease spread index based on GDP and geographic distance to quantify the spread speed of COVID-19 in a region. The analysis results showed a strong correlation between the epidemic disease spread index in a region and the number of confirmed cases. This finding provides reasonable suggestions for the control of epidemics. Strengthening the control measures in regions with higher epidemic disease spread index can effectively control the spread of epidemics. 展开更多
关键词 COVID-19 basic reproduction number gross domestic product(GDP) geographic distance cross-regional spread
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关于Gross的一个问题
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作者 卜月华 方明亮 徐万松 《浙江师大学报(自然科学版)》 CAS 1997年第3期7-11,共5页
对整函数的唯一性问题进行讨论,证明了:存在一个元素个数为11的集合S,使得对任何两个非常数的整函数f/与g,只要满足E1(S,f)=E1(S,g),必有f≡g。
关键词 整函数 唯一性象集 亚纯函数 gross
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