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221.
The corrosion rate of steel in concrete is highly dependent on the heterogeneous structure of the concrete and the environmental exposure conditions. Temperature and relative humidity are two important environmental factors that simultaneously influence the corrosion process and cannot be separated or isolated from each other. The interaction of temperature and relative humidity for characterizing the corrosion rate has been sufficiently studied. The resules show that the higher the temperature is, the greater the relative humidity is when rebar corrosion rate reaches the max, and as to different relative humidity, the increasing extent of rebar corrosion rate with rise in temperature is different. 相似文献
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西双版纳勐养自然保护区是我国野生亚洲象的主要栖息地之一,区内分布着120头左右的亚洲象。近年来由于亚洲象种群数量的增加和林内野象的食物相对减少,野生亚洲象损坏农作物、伤害人、畜的事件频繁发生。为缓解人象冲突矛盾,于2005年开展了野生亚洲象栖息地建设工作,目前已先后89次把亚洲象吸引到这一区域活动。经亚洲象在食物源基地内的活动及取食情况分析,其在食物源基地的活动与人类的农事活动具有很大的相似性。提出适当增加食物源基地的面积和数量,逐渐改变食物源基地的种植结构等建议。 相似文献
224.
《Scandinavian Journal of Forest Research》2012,27(1-4):145-152
Repeated analyses of exchangeable K, Ca, Mg and Zn revealed that the pools have decreased significantly in the topsoil (0–5 cm) of south Swedish beech forest during the 1980s. The largest decreases of K, Ca and Mg were found in the originally least acid soils, indicating that the limit for further losses from the topsoil is being approached in the most acid soils at today's deposition climate. The decrease of Zn was, on the other hand, largest in the most acid soils. Manganese had increased in especially the least acid soils, probably due to a conversion from non‐exchangeable pools as a result of the acidity change. The base saturation of the studied beech stands ranged 7.7–58.5% (mean 20.3%). The decrease rate of the exchangeable pools of K, Ca and Mg, estimated from two different time series has been relatively constant since 1949. The Zn pool has, however, decreased faster during the last decade, partly due to a lowered deposition of this element. Extrapolation of the data indicates that, as an average, only 20% of the pools of 1950 will remain in the topsoil in the year 2050. 相似文献
225.
石灰粉煤灰稳定碎石基层松散从而导致沥青路面结构开裂、起拱,经分析是由于基层中粉煤灰原材料SO3含量偏高,遇水后产生化学反应造成结构体积膨胀,最终导致基层和面层整体破坏。本文进一步分析粉煤灰原材料SO3含量偏高的原因,进而提出石灰粉煤灰稳定碎石结构原材料及施工过程的质量控制措施。 相似文献
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D'Anjou MA Carmel EN Blond L Beauchamp G Parent J 《Veterinary radiology & ultrasound》2012,53(1):11-20
Our purpose was to characterize meningeal gadolinium enhancement on magnetic resonance (MR) imaging in dogs with inflammatory and neoplastic diseases, and to assess interobserver variability and the impact of delayed acquisition and chemical fat saturation on its conspicuity. Transverse T1-weighted FLAIR images were acquired prior to, and immediately following gadolinium injection (T0), and at 5 (T5) and 15-20 min delay (TD), with and without fat suppression, in 155 consecutive dogs imaged for suspected brain disease. The agreement on meningeal enhancement was globally substantial (kappa = 0.61) and the likelihood of obtaining a definite diagnosis was significantly increased with the use of fat suppression (P < or = 0.004). Meningeal enhancement was judged definitively present by consensus in 46 of 155 (30%) dogs. Of these, meningeal enhancement was characterized qualitatively and quantitatively in 30 dogs with a clinical diagnosis (18 inflammatory, 11 neoplastic, 1 infarct), and image sequences were compared. Meningeal enhancement was more often diffuse and leptomeningeal in animals with inflammation versus neoplasia (50% vs. 42%, and 69% vs. 48%, respectively), but significant associations were not found. Meningeal thickness and contrast ratio were higher with neoplasia (P < or = 0.02), but results did not vary significantly between series for either group. Yet, images with fat suppression were most useful 50% of the time for definite diagnosis and/or characterization of meningeal enhancement. While delayed image acquisition following gadolinium injection does not improve characterization of meningeal enhancement in dogs, fat suppression is beneficial qualitatively. 相似文献
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229.
对塞罕坝机械林场林木良种基地建设的基本条件、必要性及优势进行了分析。并对林木良种基地建设的管理提出了合理化建议。 相似文献
230.
The effects of high temperature steam pretreatment on the change in wood moisture content (MC) and characteristics of vacuum drying were investigated in this study. Poplar and manchurian walnut woods were pretreated with high temperature steam at 100°C and 140°C, prior to vacuum drying. A comparison of the characteristics of vacuum drying between steam pretreated wood and untreated wood was carried out. The results show that during steam pretreatment, the MC of wood decreased within a few hours. The reduction of MC varied with the temperature; the higher the temperature, the faster the MC dropped. During the vacuum drying stage, the rates of drying of pretreated samples were higher than those of untreated samples when MC was below the fiber saturation point. Furthermore, the total drying time of samples treated at a steam temperature of 140°C was lower than that of untreated samples. Therefore, a vacuum procedure after steam pretreatment can effectively shorten the drying time when drying wood. 相似文献