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基于多元线性回归探索烘前水分控制模式 被引量:1
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作者 朱轶 邢伟标 +2 位作者 郑炯 杨文超 杨蕊艳 《中国新技术新产品》 2022年第5期34-37,共4页
烘前含水率作为制丝工序中叶片段与叶丝段的衔接水分控制点,其稳定性反映了制丝前道预处理段对水分的控制能力,并且会直接影响制丝后段对成因烟丝的水分控制效果。因此,该文利用多元回归的分析方法和上海卷烟厂的数据管理系统,从历史数... 烘前含水率作为制丝工序中叶片段与叶丝段的衔接水分控制点,其稳定性反映了制丝前道预处理段对水分的控制能力,并且会直接影响制丝后段对成因烟丝的水分控制效果。因此,该文利用多元回归的分析方法和上海卷烟厂的数据管理系统,从历史数据中发掘了众多影响烘前含水率变化的因子,并建立了基于实际生产运用的线性回归预测模型,通过控制调节松散段加水比例以及加料出口水分,达到控制烘前含水率的目的。经过生产验证,模型最终加水比例偏差大约为0.3,加料后含水率偏差为±0.1。 展开更多
关键词 烘前含水率 线性回归 环境温、湿度 冷、热批次
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ON THE DESIGN OF A NEW HUMAN COMFORT INDEX 被引量:2
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作者 冯业荣 王安宇 林镇国 《Journal of Tropical Meteorology》 SCIE 2004年第1期106-112,共7页
In designing the human comfort index (CI) used in Guangzhou, a Gaussian curve was adopted as the fundamental profile to develop a traw hat?model of comfort index. The model projects low or high temperatures into low i... In designing the human comfort index (CI) used in Guangzhou, a Gaussian curve was adopted as the fundamental profile to develop a traw hat?model of comfort index. The model projects low or high temperatures into low index values and the moderate temperatures into high index values. Air temperature was chosen as a basic factor in the model. Other factors such as humidity, sunshine and wind speed were introduced by considering them as temperature departures to an equivalent apparent temperature (EAT). Since the index is a relative index, 25C was chosen as an ideal apparent temperature (the most comfortable state) and a maximum CI value of 100 was assigned at this temperature. While in other circumstances, the index would be lower than 100. By utilizing this model, the daily comfort index values had been calculated for Guangzhou city for 1998-1999, using mean temperature, mean humidity, mean wind speed and total hours of sunshine. Results show that the new model was reasonable and practicable. Not only could it reflect the monthly variation of human comfort in Guangzhou, but also was sensitive to short-term changes of weather conditions. 展开更多
关键词 equivalent apparent temperature (EAT) human comfort index (CI) Gaussian function
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Fruit protected cultivation in China 被引量:2
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作者 Gao Huajun, Wang Saoming, and Wang Jiaxi Shandong Institute of Pomology, Tai’an 271000, China 《Hunan Agricultural Science & Technology Newsletter》 2003年第3期2-9,共8页
Protected fruit cultivation in China has developed very quickly from the early 1990s, and now it is an important branch in fruit cultivation. A brief review including fruit species, developing history, growing area, o... Protected fruit cultivation in China has developed very quickly from the early 1990s, and now it is an important branch in fruit cultivation. A brief review including fruit species, developing history, growing area, output, and distribution in the whole country is made in the paper. Characteristics of the dominant kinds of greenhouse, environmental control methods, and standards of temperature, humidity, light and CO2 for different fruit species are presented. Information on varieties, growing benefits, special management practices and other aspects of the main fruit species used for protected cultivation are also presented. 展开更多
关键词 FRUIT protected cultivation GREENHOUSE environmental control
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Effect of Ambient Temperature and Humidity Conditions on the Efficacy of Organic Treatments against Varroa destructor in Different Climatic Zones of Chile
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作者 Aldea Patricia Rodriguez Rafael Olivares Alejandra Farffin Macarena Riveros Daniel Nfifiez Fanny Trivelli Luz 《Journal of Agricultural Science and Technology(A)》 2013年第6期I0003-I0003,475-483,共10页
Varroasis is a disease caused by the mite Varroa destructor, which affects honeybees worldwide. It is estimated that it entered Chile in 1992, and it must be controlled through different types of treatments such as th... Varroasis is a disease caused by the mite Varroa destructor, which affects honeybees worldwide. It is estimated that it entered Chile in 1992, and it must be controlled through different types of treatments such as thymol, formic and oxalic acid in different formulations and presentations. This kind of organic products has shown a variable acaricidal capacity, since different factors affect their efficacy such as ambient temperature and humidity, product presentation and location inside the hive, etc.. In Chile, beekeeping takes place in four different climatic zones, in which ambient temperature and humidity as well as the duration of the apicultural season are different. Therefore, the aim of this study was to determine how ambient temperature and humidity influence the efficacy of the organic treatments used in the beekeeping season. Different apiaries were installed in those climatic zones in three seasons between the years 2009 and 2012. All beehives received the same management in each apiary and it was evaluated the same organic treatments in different formulations and presentations. All the beehives were positive to Varroa, which was obtained using samples of adult bees and the soapy water test before and after each treatment. A thermo-hygrometer was installed in each apiary in order to monitor the ambient temperature (T°) and humidity (H°) conditions, which were registered daily for a period of 30 days since the beginning. It was obtained that the treatments' efficacy increases as the minimum T° and average T° rose, whereas on the contrary, the efficacy decreases when maximum H° was higher. 展开更多
关键词 VARROA organics treatments EFFECTIVENESS acaricidal effects.
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Verification of the stomatal conductance of Nebbiolo grapevine
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作者 Stefania PRINO Federico SPANNA Claudio CASSARDO 《Journal of Chongqing University》 CAS 2009年第1期17-24,共8页
Wine is one of the most important Italian export products,and Nebbiolo is one of the most respected Italian grapes. In the summer of 2007,a measurement campaign was carried out in a Nebbiolo vineyard located in Vezza ... Wine is one of the most important Italian export products,and Nebbiolo is one of the most respected Italian grapes. In the summer of 2007,a measurement campaign was carried out in a Nebbiolo vineyard located in Vezza d’Alba,near Cuneo,Italy. Using a gauge of trade gases and some other instruments,we recorded the stomatal conductance and also some physiological parameters useful for estimating the dependence of stomatal conductance on environmental variables. The goal of this experiment was improving the parameterization of grapevine evapotranspiration through the assessment of the stomatal conductance and,in particular,of the functional dependence of the stomatal conductance on the following variables:the photosynthetically active radiation,the atmospheric temperature,the atmospheric moisture deficit,and the carbon dioxide concentration. The observations allowed us to check and,in some cases,to adapt the existing general parameterizations found in literature. The results showed some significant differences with the existing parameterizations concerning the atmospheric temperature,the atmospheric moisture deficit,and the carbon dioxide concentration. The parameterizations obtained in this experiment,although referring to a specific plant and site(namely the Nebbiolo at Vezza d’Alba),could allow assessment of the best environmental conditions under which the Nebbiolo grapevine production is the best,and in future could be tested for other grapevines or climates. 展开更多
关键词 GRAPEVINE EVAPOTRANSPIRATION stomatal conductance photosynthetically active radiation
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Analysis of long-term variations of fog and haze in China in recent 50 years and their relations with atmospheric humidity 被引量:80
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作者 DING YiHui LIU YanJu 《Science China Earth Sciences》 SCIE EI CAS 2014年第1期36-46,共11页
Our analysis of fog and haze observations from the surface weather stations in China in recent 50 years (from 196l to 2011) shows that the number of fog days has experienced two-stage variations, with an increasing ... Our analysis of fog and haze observations from the surface weather stations in China in recent 50 years (from 196l to 2011) shows that the number of fog days has experienced two-stage variations, with an increasing trend before 1980 and a decreasing trend after 1990. Especially, an obvious decreasing trend after 1990 can be clearly seen, which is consistent with the decreas- ing trend of the surface relative humidity. However, the number of haze days has demonstrated an increasing trend. As such, the role of reduction of atmospheric relative humidity in the transition process from fog into haze has been further investigated. It is estimated that the mean relative humidity of haze days is about 69%, lower than previously estimated, which implies that it is more difficult for the haze particles to transform into fog drops. This is possibly one of the major environmental factors leading to the reduction of number of fog days. The threshold of the relative humidity for transition from fog into haze is about 82%, also lower than previously estimated. Thus, the reduction of the surface relative humidity in China mainly due to the in- crease of the surface temperature and the saturation specific humidity may exert an obvious impact on the environmental con- ditions for the formations of fog and haze. In addition, our investigation of the relationship between haze and visibility reveals that with the increase of haze days, the visibility has declined markedly. Since 1961, the mean visibility has dropped from 4-10 to 2-4 kin, about a half of the previous horizontal distance of visibility. 展开更多
关键词 fog and haze VISIBILITY relative humidity transition from fog into haze
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Highly stretchable and self-healable ionogels with multiple sensitivity towards compression,strain and moisture for skin-inspired ionic sensors 被引量:3
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作者 Yufeng Wang Ying Liu +3 位作者 Nan Hu Peiru Shi Chao Zhang Tianxi Liu 《Science China Materials》 SCIE EI CAS CSCD 2022年第8期2252-2261,共10页
Ionic skin(I-skin)is an emerging skin-inspired sensor that has received increasing interest for the next-generation wearable electronics.However,profound challenges for I-skin remain in achieving multiple signal respo... Ionic skin(I-skin)is an emerging skin-inspired sensor that has received increasing interest for the next-generation wearable electronics.However,profound challenges for I-skin remain in achieving multiple signal responses(e.g.,strain,pressure,and humidity)and self-healability to fully mimic human skin.Herein,a Fe;ion-coordinated poly(acrylic acid)ionogel(PAIFe)with high stretchability,extreme temperature tolerance,and self-healing capability is prepared by a dynamic ionic cross-linking strategy.The ionic coordination in the PAIFe contributes to the formation of a highly dynamic network,achieving its high-efficient and reliable self-healing performance even at a low temperature of-20℃.Using of 1-butyl-3-methylimidazolium tetrafluoroborate([BMIm][BF^(3+)])as the solvent achieves a widetemperature tolerance of the PAIFe under low and high temperatures.More interestingly,a humidity sensing function is realized in the PAIFe by skillfully utilizing the hygroscopic properties of[BMIm][BF_(4)].The resultant PAIFe is proof-ofconcept demonstrated as a deformation-tolerant ionic conductor in a skin-inspired ionic sensor,showing a variety of sensory capabilities towards compression,strain and humidity. 展开更多
关键词 stretchable ionic conductor ion coordination dynamic cross-linking self-healability at low temperature skininspired sensor
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Modeling of mechanical behaviors for natural fiber reinforced composites under hygrothermal ageing
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作者 Zheng Zhong Fang Tian 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2017年第12期80-82,共3页
In recent years,natural fiber reinforced composites have been widely applied to various industrial products for their excellent environmental-friendly performance.It is essential to understand the mechanical propertie... In recent years,natural fiber reinforced composites have been widely applied to various industrial products for their excellent environmental-friendly performance.It is essential to understand the mechanical properties of natural fiber reinforced composites under their in-service environment.Compared with synthetic fibers,the hydrophilicity of natural fibers could result in a much larger quantity of water absorption from the moisture atmosphere,which would have adverse consequences for the durability of natural fiber reinforced composites[1].The environmental temperature would affect the 展开更多
关键词 reinforced DURABILITY MOISTURE consequences friendly ageing CONSTITUTIVE HAVE HYDROLYSIS DETERIORATION
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