竹材单元形态对竹木复合层积材性能的影响

通过对不同竹材单元形态竹层积材及竹木复合层积材物理力学性能进行研究,分析了竹材形态对层积材性能的影响。结果表明:相同的组坯方式、浸胶工艺和热压工艺条件下,竹材单元形态对竹层积材及竹木复合层积材的物理力学性能有明显的影响。以竹篾为主要单元的层积材力学性能较好,但是尺寸稳定性较差;以竹束单板为主要单元的层积材力学性能低于前者,但其力学性能均能达到结构用单板层积材最高级别的要求,且其胶合性能和尺寸稳定性均优于前者。     

竹木复合单板层积材中加捻竹束的预应力效应

根据纺织及复合材料理论给出了描述加捻竹束在竹木复合单板层积材中产生预应力的力学模型.通过试验对比了不配置竹束、配置不加捻竹束、配置加捻竹束3种单板层积材的水平剪切强度和弯曲性能.结果表明:3种单板层积材的水平剪切强度无显著差异.配置竹束使单板层积材弹性模量和静曲强度明显增加,弹性模量增加22.8%,静曲强度增加18.6%;配置加捻竹束的竹木复合单板层积材弹性模量的提高较为明显,较配置不加捻竹束的层积材弹性模量增加17.6%,静曲强度增加11.0%.竹木复合单板层积材中加捻竹束预应力的存在能改善板材的刚度和强度,其预应力效应表现为正效应.     

江苏杨木人造板的研发与展望

在总结江苏杨木加工产业现状的基础上，分析了存在的不足，提出了具有发展强势的人造板产品，包括杨木单板层积材、杨木水泥模板、杨木复合地板、杨木人造薄木、竹木复合层积材、超常厚度中密度纤维板、草木复合中密度纤维板、软质纤维（碎料）板、定向结构板、木（草）塑复合材料、杨木木丝墙体材料和废旧木材人造板等。指出了实现人造板产业持续发展的保证措施，包括优化资源供应，重视无醛胶粘剂的研发，加强木材保护技术的研究，突出技术创新，实施人才、专利和标准战略。     

我校张齐生当选中国工程院农业、经纺与环境工程学部常委

在中国工程院第五次院士大会上,我校张齐生院士当选为农业、经纺与环境工程学部常务委员会委员。张齐生1939年出生于浙江淳安,1961年毕业于南京林学院,1997年入选中国工程院院士。20世纪80年代初开始从事竹材加工利用研究,并成功地攻克了半圆形竹筒“高温软化—展平”等技术难关,实现了工业生产,先后开发出竹材胶合板、高强覆膜竹胶合模板、竹材碎料板、竹木复合集装箱底板和竹木复合层积材等系列产品。他重视研究与应用相结合,目前,他所研究推广的产品广泛应用于汽车、火车、建筑、造船等工业,实现年产值2亿多元我校张齐生当选中国工程院农…     

结构对托盘用竹木复合层合板力学性能的影响

根据复合材料层合板理论设计出加入4种不同层数的毛竹片并且按不同铺层位置正交排列的竹木复合层合板,对各种层合板的最大荷载(Pmax)、弹性模量(MOE)、抗弯强度(MOR)和最大变形挠度(f)等进行了测试及分析.结果表明:在层合板的表层和底层加入竹片层可以大大提高层合板的最大荷载、弹性模量和抗弯强度等力学性能.同时采用主成分分析法确定了比强度的大小可以作为判断竹木复合层合板结构优劣的主要评价指标.     

刨花形态及定向角度对刨片层积材性能的影响

为优化刨片层积材(LSL)的生产工艺,提高刨片层积材性能,研究了速生杨木刨片层积材的刨花形态和刨花定向角度对其力学性能的影响。结果表明：刨花长度的增加有利于刨片层积材静曲强度(MOR)和弹性模量(MOE)的提高,但内结合强度略有下降;刨花宽度对LSL物理力学性能的影响较小;刨花厚度的增加使LSL物理力学性能下降。表层定向角对刨片层积材性能影响较大,顺纹方向上,表层定向角越小,层积材的MOR和MOE越大;芯层定向角度对刨片层积材性能影响较小。芯层随机铺装在一定程度上有利于层积材的内结合强度的提高。     

竹木复合集装箱底板静曲强度的预测模型

应用弹塑性断裂力学的Weakest-link破坏准则,分析了竹木复合集装箱底板在弯曲载荷下的破坏模式。结果表明:竹木复合集装箱底板主要发生两种形式的破坏,即底面拉伸破坏和芯层剪切破坏。同时笔者提出了这两种破坏形式下,底板静曲强度的理论预测模型,并应用统计回归模拟方法,研究了单板压缩和涂胶对静曲强度的影响规律,建立了静曲强度和弹性模量的相关模型。     

竹木复合集装箱底板弹性模量的无损检测

以竹木复合集装箱底板为对象进行在线无损检测研究。介绍了采用PLC（可编程控制器）与工控机相结合的方法进行接触式竹木复合集装箱底板弹性模量无损检测的原理,要求及程序编制。     

竹木复合空心板弯曲变形分析

分析了竹木复合空心板的结构情况与工作状态,建立了其力学计算模型,运用复合材料结构力学理论,分析了计算了竹木复合空心板在横力作用下的弯曲变形,以及剪力对弯曲变形的影响程度。为验证理论分析是否合理,对实际结构变形进行了测定。结果表明,理论分析与实测结果基本吻合。     

竹木复合集装箱底板使用性能的研究：与阿必东胶合板底板的…

对竹木复合集装箱底板及阿必东胶合板底板的装载强度、耐老化性能、疲劳强度及滚压破坏强度进行了试验研究和对比分析。结果表明：竹木复合集装箱底板在上述性能方面具有与阿必东胶合板底板相同甚至更高的等级，其承载安全性及使用寿命优于阿必东胶合板底板。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-