Based on fiber Bragg grating, the authors develop an on-line temperature monitoring system for power cables and measure outer surface temperature of cables under different laying modes; analyze the relation among cable temperature, ambient temperature and load of cable lines.

為此設(shè)計(jì)了基于光纖光柵的電纜溫度在線監(jiān)測系統(tǒng)，實(shí)測了不同敷設(shè)方式下電纜的表皮溫度；分析了電纜溫度與環(huán)境溫度以及線路負(fù)荷間的關(guān)系；采用等效熱路法，由監(jiān)測到的電纜表皮溫度擬合出電纜的實(shí)際載流量最新国内真实迷奷在线播放，實(shí)現(xiàn)了對(duì)電纜溫度及載流量的在線監(jiān)測，確保電纜運(yùn)行的安全性與經(jīng)濟(jì)性国产福利小视频在线观看资源网站。

The temperature of the fuel plates and pectinate localizers is high, and the temperature of the side panels is close to the temperature of the flows between fuel plates, and the temperature of the flow outside of the side panels is low.

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Result］ It could be concluded through analyzing the model that both the mass uncertainties of quinoline phosphomolybdate precipitates and tested samples were from the resolving power and precision of balance and its maximum tolerance in assay certificate; the uncertainty brought in by volumetric flask was from the permissible error of 250 ml volumetric flask, the operation of increasing the volume to scale of volumetric flask while diluting solution and the difference between experimental temperature and the temperature at the time when the volumetric flask was calibrated; the uncertainty brought in by pipette was from the permissible error of itself, the operation of increasing the volume to intake scale while taking solution and the difference between experimental temperature and the temperature at the time when the pipette was calibrated.

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The contents of Chla and Car were sensitive to low temperature stress, it seems that they were vulnerable to low temperature stress and partly decomposed. Relatively, the content of Chlb changed little. The ratio of Chla/b had positive linear correlation with temperature, which meant the photosynthetic ability of podocarpus fleuryi Hickel seedlings declined under winter low temperature stress.

葉片中葉綠素a和類胡蘿卜素含量對(duì)低溫脅迫反應(yīng)較為敏感，容易遭受低溫脅迫而部分地分解破壞91在线精品欧美观看，含量下降尤物在线视精品在亚洲，而葉綠素b則相對(duì)變化較小，Chla／b值呈現(xiàn)與溫度的線性正相關(guān)bbbxbbbxx，顯示了長葉竹柏幼苗在冬季低溫脅迫下光合能力的下降情況日韩精品国语在线观看免费视频网站。

To study the ecophysiological effects of low temperature stress on podocarpus fleuryi Hickel seedlings, two-year-old seedlings were selected as experimental material. We conducted comparative study. On the one hand, seedlings were separately placed in the plots located at the top, half-way-up and the foot of Jinyun Mountain (different altitudes at Jinyun Mountain led to the difference in air temperature) and subjected to winter low temperature stress. On the other hand, in laboratory, seedlings were exposed to simulated low temperature stress which were artificially controlled .

為了探討低溫脅迫對(duì)長葉竹柏幼苗的生理生態(tài)影響，本試驗(yàn)選取長葉竹柏的二齡幼苗為試驗(yàn)材料在线免费AV播放，在試驗(yàn)方法上采取了對(duì)比研究方法：一方面中日韩最新无码视频网站大全，利用縉云山不同的海拔造成的溫度差異，分別將幼苗置于山頂午夜欧美一区二区、山腰和山腳下三個(gè)樣地中99riAV.cn，進(jìn)行野外冬季自然低溫脅迫處理永久地址发布页；另一方面麻豆国产原创视频在线，在實(shí)驗(yàn)室中，利用人工控制的不同低溫進(jìn)行模擬低溫脅迫處理。

Using the principle of superposition ,a simplified computational method of mass concrete surface temperature change,the lowest temperature value and temperature stress is provided when the temperature drops quickly.

采用疊加原理亚洲一级这片，研究氣溫驟降時(shí)日韩性插，大體積混凝土表面的溫度變化、最低溫度值和溫度應(yīng)力的簡化計(jì)算方法国产一级一级A一级A级。

Based on the technique of radiate temperature measurement, the author designs a circuit of prismatic decomposition colorimetric radiate temperature measuring. A high resolution A/D converter and measurement range switch technology are adopted to resolve the problem that it has lower radiation power and lower signal sensitivity in the low-temperature stage, while higher signal amplitude and higher need of dynamic range in the high-temperature stage. The technique of the Black Body Furnace demarcates, digital calibration and the quartic curve fitting are applied to correct the sensor and improve its measurement precision.

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The work had been carried out can be summarized as follows: 1. Thermal cycle analysisBased on the classical thermodynamics, influence of isobaric reheat and isovolumetric reheat on cycle output is discussed. Based on the finite time thermodynamic theory, the thesis discusses the optimization of Rankine cycle, Brayton cycle and Stirling cycle between constant temperature heat source and constant temperature heat sink or between variable temperature heat source and constant temperature.

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The CO2 uptake rate of plants is affected by the plant species and environmental conditions such as photosynthetically active radiation, temperature, water and nutrient contents. PAR is the most immediate environmental control on photosynthesis while air temperature affects both photorespiration and dark respiration. In the natural condition, PAR and temperature play an important role in net CO2 uptake. The effects of PAR and air temperature on the CO2 uptake of Pterocarpus macrocarpus grown in a natural habitat were studied in the present work. Due to many uncontrollable factors, a simple rectangular hyperbola could not represent the measured data. The data were divided into groups of 2℃ intervals; CO2 uptake in each group may then be related to PAR by a rectangular hyperbola function. Using the obtained functions, the effect of PAR was removed from the original data.

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Two kinds of thermal residual stresses exist in metal matrix composites. One of them is temperature gradient induced thermal stresses caused by temperature gradient in MMC. The other can develop upon cooling from the processing temperature to room temperature due to the coefficient of thermal expasion mismatch between the fiber and matrix and is called CTE mismatch induced thermal stresses.

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