一种家具用新型移门的技术

移门是指在滑道或导轨上左右滑动,而不能转动的门,又称推拉门、趟门、梭门、滑动门等.移门的应用历史悠久,种类繁多,形式优美,结构各异.     

一种具有仿形功能的竹材激光雕刻机的设计

激光加工由于受到激光聚焦后焦点位置的影响,只能加工表面比较平整的材料。具有仿形功能的竹材激光睢刻机利用CCD激光测距传感器和伺服焦距调节机构的激光雕刻机的设计方法,专门针对竹材表面具有尖削度、不圆度、不直度和起伏度缺陷的异形表面材料,用于对竹材表面进行加工。     

一种新型秸秆育苗容器技术特性的研究

秸秆容器是一种新型的育苗容器,它是由作物秸秆经碎化后,外加固化剂经机械加工制作而成,目前生产的容器呈圆台状,主要的技术参数是:容器高5.5 cm,容壁厚0.245 cm,容器重13.6g,容积65 cm3。研究表明:该容器技术特性表现为易分解和腐烂,分解的快慢与基质中的水分状况有密切的关系;容器的透气、透水性好,但保水性能较差;容器易破碎;容器可以促进苗木侧根形成根团,但苗木的主根很容易穿透容器的底部。     

一种新型竹木复合板的研究

提出了生产竹木复合板的一种新技术，利用竹编席和木材互相胶合研制出一种新型竹木复合板，该竹木复合板包括两木质面和一个芯层，其特征是面板的木纹方向与复合板的宽度方向一致，芯层至少为一层竹编织物。     

一种新型节能保温墙体的研究

随着经济的快速增长,能源短缺等相关问题已经越来越严重,建筑节能问题已成为可持续发展的重要保证。该文介绍了现今我国在保温墙体应用上所采取的一些方法和措施,墙体保温的形式及特点;并重点论述了新型环保节能型材料玻化微珠在墙体保温中的应用前景。     

一种新型纤维素吸附剂的制备研究

采用蔗渣纤维素、丙烯酸(AA)、丙烯酰胺(AM)、甲基丙烯酰氧乙基三甲基氯化铵(MAETAC)为原料,通过接枝共聚反应制备出一种新型纤维素吸附剂,对制备该吸附剂的影响因子如碱化时间、碱质量分数、单体的用量、引发剂(NaHSO3、(NH4)2S2O8)用量、温度和时间等条件进行了分析研究.该纤维素吸附剂的最佳合成工艺为:碱化时间90 min,NaOH质量分数30%,AA中和度60%,相对于吸附剂整体,纤维素质量占20%,单体AA占47.3%,AM占26.3%,MAETAC占6.4%,引发剂占2.6%(相对于单体用量),反应温度70℃,反应时间3 h.该工艺条件下所得吸附剂对Cu2 的吸附量达25.1 mg/g.     

一种新型生物质进料机构的研究

针对国内生物质给料系统容易出现卡塞、回火、给料不均匀等问题,设计了一种新型生物质给料系统,并搭建了试验平台,对落料、控料、送料等诸多环节进行试验,以确定最佳设计方案。     

一种新型的成图设备——光学复照静电成图机试制成功

该成图机的特点是把光学复照同静电复印结合在一起,既解决了缩放问题又解决了复印问题。研制的思路非常好,很有推广价值。     

一种新型森林灭火技术原理的试验探索

当前,国际上森林火灾防治技术的研究,仍十分重视水和化学药剂方法的不断完善,并十分强调其空中运载工具的改进,提高机动性与快速反应能力.然而森林火灾经常发生在人员和物质难以抵达的地区,林火阵面随风速、地形、林种、地貌等许多因素不断变化.因此,目前一方面还只能在完善传统方法的基础上,综合运用多种灭火技术,互相配合到达最好的灭火效果;另一方面,更需要探索新的概念,大力发展新的高效的灭火技术.     

纤维板热磨机磨片材质开发与研究

Defibrator is a very important machine in the wood industry for producing fiberboard.The refiner plates are the key parts of defibrator that directly act with the wood,and broken easily.The working life of the refiner plates is of significance to the wood industry.It may affect refining quality,production efficiency,and power consumption.In this paper,the abrasion resistance of the refiner plate made of different materials,the stainless steels and high chromium cast irons,were tested and compared.The results showed that abrasion resistance of refiner plate made of high chromium cast irons was better than that of the stainless steel materials.Although the two kinds of materials have the same compositions,their abrasion resistances have apparent difference.The main reason is that the material microstructures have very important effects on their performance.The refiner plates made of developed high chromium cast irons don‘t demand the complex heat treatment.This can simplify the producing process,save the cost of production,decrease labor strength,and increase the production efficiency.     

Fire-resistant performance of a laminated veneer lumber joint with metal plate connectors protected with graphite phenolic sphere sheeting

Creep under fire of laminated veneer lumber (LVL) joined with metal connectors was studied. The fire-resistant performance of LVL butt joints connected with metal plates protected with graphite phenolic sphere (GPS) sheeting was discussed. The GPS sheeting was overlaid on the joint in different sizes and locations. The joint was exposed to a burner with a top flame temperature of 800°C and loaded with a load of 200 N to test for creep under fire. The results showed that the fire-resistant performance of the joint was markedly improved by the sheeting. The size and location of the GPS sheet significantly affected the time to rupture of the specimen, which was six times longer than that without GPS. Temperature measurements at the joint showed that the GPS sheeting distributed the heat along the surface and delayed failure. Thermographic images and analyses clarified the improvement in fire-resistant properties due to GPS.     

板梁桥橡胶支座的设置

通过设计及工程实践,针对桥梁支座设计施工中经常遇到的一些问题加以探讨,提出改进意 见。     

Comparing stand inventories for large areas based on photo-interpretation and laser scanning by means of cost-plus-loss analyses

Evaluations of inventory methods usually end when precision and bias are quantified. Additional information on the appropriateness of a method may be provided through cost-plus-loss analyses, where the total costs are calculated as the sum of net present value (NPV) losses, i.e. expected economic losses as a result of future incorrect decisions due to errors in measurements, and inventory costs. The aim of the study was to compare inventories of basal area, dominant height and number of trees per hectare based on photo-interpretation and laser scanning from two sites in Norway by means of cost-plus-loss analyses. In general, more precise estimates were found for laser scanning than for photo-interpretation, while the biases were about equally distributed between the two methods. On average for the two sites, the inventory costs, NPV losses and total costs for photo-interpretation were about 6, 49 and 54 euros ha^?1, respectively, while they were 11, 13 and 25 euros ha^?1 for laser scanning. The data used for the comparison were limited to two sites and 77 stands, and certain simplifying assumptions were made in the cost-plus-loss analyses. Still, there is reason to believe that the results of the study are of general validity with respect to the main conclusion when comparing the two methods.     

八角有效成分莽草酸提取新工艺

八角是我国特色林产品,除可以提取茴油外,还含有合成"达菲"的重要成分——莽草酸。本文介绍一种从八角中提取莽草酸的生产新工艺,主要利用离子树脂交换、树脂吸附法、溶剂法等分离提纯方法制备莽草酸,莽草酸纯度达99%以上,得率大于3.5%。     

A new technique to classify the compatibility of wood with cement

Summary Wood-cement panels have commanded renewed interest during the last decade because of their potential application in the building industry. Several methods to classify wood of various species regarding its compatibility with cement have been established in the literature based on hydration measurements in Dewar flasks. These ranking methods lack consistency in the classification of species because the hydration conditions vary among laboratories. Three techniques for evaluating wood-cement compatibility were established and compared. The best technique is based on a wood-cement compatibility factor which is the ratio of the area under the wood-cement hydration heat rate curve to that of neat cement. The area is calculated on 24-h basis starting from the initial cement set time. This area ratio method ranks species over a 100% scale and accounts well for species that are totally incompatible.This research was supported in part by the U.S. Agency for International Development under contract number 608-0160 administered by the Hassan II Institute of Agronomy and Veterinary Sciences, Morocco, and the University of Minnesota, USA     

杉木速生丰产林营造新技术

从造林地选择、造林前准备、植苗造林、造林后管护、造林投入分析、新技术适用范围等方面介绍了以化学除草+造林地内培植大苗的杉木营造林新技术。     

Development of LVL frame structures using glued metal plate joints II: strength properties and failure behavior under lateral loading

In past years high priority was given to developing a seismic design for wood structures, including research on the response of wood structures to earthquakes. In this study a new type of portal frame with relatively large span was developed for the traditional Japanese wooden houses with large openings at the front to strengthen the structure. Stainless steel plates coated with zinc and glued with epoxy adhesives on laminated veneer lumber (LVL) members, composed of Douglas fir veneer and bonded with phenolformaldehyde resin, were used. The connection between the frame's beam and columns and between the columns and groundsills was mechanical, with bolts. The subject of this research was to analyze strength properties and failure behavior of glued LVL metal joints used as structural components and to evaluate the response of LVL portal frames under cyclic lateral loading. The results show that portal frames using glued LVL metal plates have a good multiplier for the shear walls and may be applied to traditional Japanese structures. The equivalent viscous damping provided good energy dissipation in the frames. The joints displayed good mechanical behavior during tests; moreover, the structures demonstrated high strength, stiffness, and ductility, which are necessary for a seismic design.Part of this paper was presented at the 47th annual meeting of the Japan Wood Research Society, Kouchi, April 1997; and at the 5th world conference on timber engineering. Montreux, Switzerland, August 1998     

论森林培育技术的精准化

人工林的培育与利用对林业可持续发展具有重要作用。要利用有限的林地和环境资源高效地培育人工林, 就要求森林培育技术精准化。文中对森林培育技术精准化的含义、内容、研究现状和实现途径进行了分析和阐述。     

CAD/CAM注塑模设计实训综合分析

本实训针对机械制造技术方向专业学生,以注塑模具综合设计性实训为例,以CAD/CAM软件UG NX10.0建模模块和注塑模MOLDWIZARD模块为主要工具,结合模具设计、机械设计等专业知识,阐述了注塑模设计实训的内容、目标、条件以及实训完成步骤和工作原理。本实训有效的激发了学生对注塑模设计的兴趣,增强了学生运用多门课程知识解决实际问题的能力和独立思考的能力。为巩固专业知识,增强专业技能起到较好的锻炼和启迪作用。