木材

The paper carries on qualitative analysis to the acetone extractives before and after discoloring, shows the main components of the extractives and then takes comparison. The results shows :①The hydroxyl is oxidized and then shifted to the carbonyl,carboxyl, ester and ketone groups during inducing discoloration under the pretreatment conditions,which makes the wood color deep;② There are plenty of auxochromic groups in the acetone extractives of silver chain, the interaction between the auxochromic groups and the chromophoric groups makes the wood color deep.

摘 要：本文通过对刺槐变色前后丙酮抽出物的定性分析，得出变色前后丙酮抽出物的主要成分，进行对比分析，初步得出抽出物对诱发变色的作用为：①变色前后羟基在预处理条件下氧化成羰基，羧基，酯基和酮基等官能团，使木材颜色加深；②刺槐丙酮抽出物的主要成分中含有大量助色基，这些基团会与木素中的发色基团相互作用，使木材颜色加深。

The lumber of Eschweilera Longipes and Cariniana Pyriformis contains many silicon, to seawater corrode have very strong resistance, it is the commodity lumber with famous South America.

Eschweilera longipes和Cariniana pyriformis的木材都含大量的硅，对海水的腐蚀有很强的反抗力，是南美闻名的商品木材。

Any of a number of trees which have similar timber or foliage, in particularseveral Australian eucalyptus trees (genus Eucalyptus, family Myrtaceae)the tropical American Venezuelan or West Indian box (Casearia praecox, family Flacourtiaceae), the timber of which has now largely replaced that of the European box

木材或树叶相似的树，尤指澳大利亚桉树南美委内瑞拉或西印度群岛的早生脚骨脆（拉丁名Casearia praecox，大风子科），早生脚骨脆木材已大量替代欧洲黄杨木

Except toughness and hardness, the main mechanical intensity of Castanopsis fissa was at the medium level in domestic wood species.

除冲击韧性和硬度较低外，大叶栎木材的主要力学强度均属于国产木材的中等级水平。

Castanopsis fissa ; physical properties of wood ; mechanical properties of wood

大叶栎；木材物理性质；木材力学性质

The softwood of Cunninghamia lanceolata and Pinus massoniana were steam-treated at temperature 90℃ and 100℃. The hard wood of Nothofagus spp.

分别对针叶树材的杉木和马尾松木材，以及阔叶树材的假水青冈和香椿木材进行汽蒸处理。

They also visited the Guangdong Entry-Exit Inspection and Quarantine Bureau is responsible for timber inspection Mr. Zhang Ke, Zhang said, from their current detected by the look of wood are harmful to humans, but also did not find the black Dalbergia Romer.

记者还采访了广东出入境检验检疫局负责木材检验的张科先生，张先生表示，从他们目前检测到的对人体有害的木材来看，还没有发现卢氏黑黄檀。

Based on the established database for poplar and birch, the developed color measurement-matching system is used to carry out imitation of precious wood species such as Dalbergia fusca Pierre, Dalbergin bariensis Pierre and Juglans.

利用建立的杨木和桦木基础数据库，进行黑酸枝、红酸枝和黑胡桃等珍贵树材仿真，分别修正0~2次后即能达到要求，所模仿的珍贵木材材色与天然木材材色相近，着色均匀，色差小。

The thermodynamics quantities were calculated based on the first relaxation process. The results indicated that active enthalpy△H and active entropy △S all decreased with the increase of decrystallization extent. And, it was concluded that the relaxation process of untreated wood is for endothermic reaction and that of treated wood for exothermic reaction.

并通过计算获得了第一个松弛过程的各个热力学量，活化焓△H和活化熵△S都随着非晶化处理程度的增加而减小，未处理木材的松弛过程为吸热反应，而处理木材的松弛过程为放热反应。

In a similar retention, the fire-retardant properties of A. falcata timber better than the wood of P. massoniana.

在相近载药量时，南洋楹木材比马尾松木材的阻燃效果显著。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。