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张静静 《广东海洋大学学报》2007,27(2):33-37
不定数是称数法的一个重要组成部分,秦汉时期又是称数法剧烈发展变化的时期,出土材料的发掘整理又为这一研究提供了新的语料来源。对秦汉简帛中不定数的表示形式进行系统考察,发现秦汉时期表不定数的词增多,数词连用表不定数的形式更为丰富,出现了不定数表示的羡余形式。 相似文献
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通过对我国历史上箭竹开花及王朗自然保护区箭竹生长气象条件的研究认为，箭竹开花多在冬暖夏凉的年份；箭竹的生长量可由气象因素的变化来进行预测。研究结果可为保护大熊猫提供一定的气象依据。 相似文献
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Chemical analyses suggest that the metavolcanic rocks of the Almas Greenstone Belt (AGB), Tocantins State, Brazil have a continental affinity, possibly related to a continental rift environment. They were metamorphosed to amphibolite facies during a regional tectono-metamorphic event (Dn), retrogressed to greenschist facies assemblages and then hydrothermally altered within dextral strike–slip shear zones (Dn+1). Fracture sets related to Dn+2 intersect Sn+1.The Paiol Gold Mine is one of several mineralised zones within metabasic and meta-intermediate rocks of the AGB. It exploits shoots of sulphide–Au–quartz mineralisation that occupy dilational zones approximately perpendicular to an elongation lineation (Ln+1) within mylonitic foliation Sn+1 (Sn+1=S within the S–C fabric). The dilational zones probably formed due to dextral displacement on sinistrally en echelon C surfaces. Minor amounts of gold may have been introduced or remobilised during Dn+2.Coexisting primary and pseudosecondary fluid inclusions in mineralised quartz veins from ore shoots comprise a high-salinity three-phase type (Type II) and a lower salinity two-phase type (Type I). Homogenisation temperatures for Type II inclusions range from 200 to 410 °C and Type I from 90 to 320 °C. The inclusions and their temperature ranges are believed to reflect heat exchange and some mixing between the two fluid types under relatively constant ambient temperatures, but variable (though broadly declining) fluid temperatures. This took place late in Dn+1 in conjunction with greenschist facies retrogression and localised hydrothermally induced metasomatism. 相似文献
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夏帝发七年“泰山震”的解读 总被引：1，自引：0，他引：1
概述了对今本《竹书纪年》夏帝发"七年,陟。泰山震"这条记载的各种见解和涉及的今本《竹书纪年》的争鸣等;分析了这条史料的关键字"陟"、"震"在古文中的字义和在《竹书纪年》中的特定含义,结合夏商周断代工程研究成果等,认为对夏帝发"七年,陟。泰山震"的确切解读是:夏帝发于在位的第七年(约公元前1652年)崩亡;这一年泰山发生地震或受到地震的影响,地震发生的时间比此前推算的公元前1831年推后了179年,但无法确定这次地震的震中位置和震级。 相似文献
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In this study, protoplasts were successfully isolated from Kappaphycus alvarezii using snail enzymes, abalone enzymes and cellulase. The optimum enzymic ratio was fixed to be 20% of abalone enzyme, 12% of cellulase and the osmotic stabilizer was 2.0 mol/L glucose. The optimum enzymic hydrolysis conditions were found to be dark enzymolysis at 30°C continuing for 4.0 h. The resultant density and yield of protoplasts achieved 32.60×104 mL-1, 65.20×104 g-1 tissue for Kappaphycus alvarezii. Finally, under the temperature of 20°C, light intensity of 1 500–2 000 lx and photoperiod of 12 h/d, two developmental pathways were investigated:(1) callus-like cell mass and regenerated plantlet occurred on protoplast;(2) young shoots and calluslike cell mass occurred in tissue blocks after enzymolysis. 相似文献
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Chuan‐Chi Chien Ying‐Pin Huang Wie‐Chieh Wang Jun‐Hsing Chao Yuan‐Yao Wei 《洁净——土壤、空气、水》2011,39(2):103-108
Preventing radioactive pollution is a troublesome problem but an urgent concern worldwide because radioactive substances cause serious health‐related hazards to human being. The adsorption method has been used for many years to concentrate and remove radioactive pollutants; selecting an adequate adsorbent is the key to the success of an adsorption‐based pollution abatement system. In Taiwan, all nuclear power plants use activated carbon as the adsorbent to treat radiation‐contaminated air emission. The activated carbon is entirely imported; its price and manufacturing technology are entirely controlled by international companies. Taiwan is rich in bamboo, which is one of the raw materials for high‐quality activated carbon. Thus, a less costly activated carbon with the same or even better adsorptive capability as the imported adsorbent can be made from bamboo. The objective of this research is to confirm the adsorptive characteristics and efficiency of the activated carbon made of Taiwan native bamboo for removing 131I gas from air in the laboratory. The study was conducted using new activated carbon module assembled for treating 131I‐contaminated air. The laboratory results reveal that the 131I removal efficiency for a single‐pass module is as high as 70%, and the overall efficiency is 100% for four single‐pass modules operated in series. The bamboo charcoal and bamboo activated carbon have suitable functional groups for adsorbing 131I and they have greater adsorption capacities than commercial activated carbons. Main mechanism is for trapping of radioiodine on impregnated charcoal, as a result of surface oxidation. When volatile radioiodine is trapped by potassium iodide‐impregnated bamboo charcoal, the iodo‐compound is first adsorbed on the charcoal surface, and then migrates to iodide ion sites where isotope exchange occurs. 相似文献
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针对复杂背景桥梁裂缝图像难以提取真实裂缝细节的技术问题，提出基于海森矩阵旋转矢量不变性的滤波去噪和局部区域裂缝走势生长方向连接的联合提取裂缝算法。利用海森矩阵增强图像突显裂缝区域，利用自适应阈值分割算法对图像进行二值分割；采用基于旋转矢量不变性的滤波算法滤掉团状噪声，根据裂缝的走势对生长方向一致的局部区域裂缝进行连接，排除条状非裂缝的影响和部分噪声的干扰；解决了图像处理中存在大量污渍残留和裂缝不连续现象。实验结果表明，本算法对复杂背景桥梁图像提取裂缝的准确度高于其它算法。 相似文献
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A thin-walled steel tube/bamboo plywood composite hollow column with binding bars (SBCCB) was developed using transverse binding bars to reinforce a thin-walled steel tube and bamboo plywood composite hollow column. Low reversed cyclic loading tests were performed on 9 SBCCB specimens to observe the damage process and morphology in the SBCCBs. The effects of the slenderness ratio, the net cross-sectional area of the bamboo plywood, the assembly patterns of the cross sections, and the binding bars on the stress and seismic performance were investigated. The results show that the main failure modes of the SBCCBs were cracking of different adhesion interfaces at the base of the column and fracturing of the bamboo plywood. The cross-sectional assembly pattern has a significant effect on the failure modes; increasing the cross-sectional area and the slenderness ratio of the composite column will dramatically improve the seismic performance of the SBCCBs. SBCCBs have excellent elastic deformation and seismic energy consumption characteristics. The binding bars ensure the integrity of the specimen and inhibit the failure of the adhesion interface at the base of the column. Finally, based on the measurement of the axial pressure and the stress-strain curve within elastic range of the composite columns, a simplified mechanical model and a calculation method for bearing capacity was formulated. The calculation values of bearing capacity agree well with the experimental ones, and calculation method can be used to provide guidance for engineering applications of a SBCCB. 相似文献
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