发动机座瓦孔的电刷镀修复工艺

以发动机座瓦孔修复为例,介绍应用电刷镀技术进行设备维修的经验,论述电刷镀技术在修复零件磨损方面的典型工艺、方法和效果等。     

铸铁件表面缺陷及损伤修补技术的研究

利用铸造的可焊性，采用铸铁冷焊的方法修复铸铁件表面的缺陷及损伤，着重阐述了铸铁冷焊的焊接性能及焊接方法和在焊接中常出现的各种缺陷及预防措施，特别介绍了冷焊法在修复机床导轨磨损面上的应用。     

珩磨镀铁复合工艺参数的优化

珩磨镀铁复合工艺是为了修复筒类零件而研究并发明的一种新型工艺，它主要是将镀铁工艺和珩磨工艺联合在一起，在一台复合工艺的专用机床上，就能够实现筒类零件的修复。1珩磨镀铁复合工艺原理简介（见图）强力珩磨镀铁原理图1电解液箱;2.泵；3．下夹具体；4.珩磨油面；5...     

林业机械零件修复工艺的探讨

我国在林业机械零件修复工艺中存在以下几个问题。 1、对修旧的意义认识不足,往往把零件的修复看做是解决配件供应不足的临时措施。 2、目前修旧工艺比较落后,零件修复质量差、成本高,因此修旧件缺乏信誉;     

气缸体铸件表面缺陷修补技术的应用

介绍了气缸体铸件表面缺陷修补技术,包括铸件粘胶修理、热焊补、冷焊补等修复技术,可为同类零件的修复提供借鉴经验。     

重金属胁迫引起的大蒜 DNA 损伤与修复

以紫外分光光度法和琼脂糖凝胶电泳检测了大蒜在重金属Pb2＋和Cd2＋胁迫处理后的DNA的损伤。结果表明：Pb2＋和Cd2＋都能够胁迫大蒜DNA解链、交联程度增加，并引起部分DNA的降解；而绿豆浸出液对Pb2＋和Cd2＋引起的DNA损伤均能进行修复，且对Pb2＋引起的DNA损伤修复的效果更好。     

试论中国西部生态修复反馈效果

传统经济增长模式是牺牲环境为代价的黄色文明和黑色文明，建立人与自然和谐发展的生态文明是21世纪的绿色召唤．环境脆弱地区生态修复就成为人们关注的课题．本文运用恢复生态学的基本原理，分析了西部地区生态环境损伤的现状，探讨了生态修复的迫切性，筛理了生态修复的基本内容，论述了生态修复工程中的反馈效果，并根据西部环境恢复与治理的远景发展目标，提出了相应的发展对策。     

碳纤维布加固钢筋混凝土梁的力学性能试验

针对损伤严重钢筋混凝土梁进行环氧树脂修复与碳纤维布加固,加固之后进行力学性能试验,试验结果表明,三根损伤严重破坏的钢筋混凝土梁加固修复处理后,梁的荷载挠度曲线及荷载应力曲线呈现线性,极限承载能力提高达50%左右,结构延性略有下降,结构破坏形态类似受弯构件正截面破坏。试验证明,采用的碳纤维布加固和环氧树脂修复已破坏的钢筋混凝土构件的方法是行之有效的,可为实际工程加固设计提供理论和实际参考。     

槽内外常温镀铁工艺的特点

镀铁工艺作为一项重要的、经济可行的修复手段,目前在我国机械行业已得到广泛的应用。根据被镀工件表面形状大体可分为两大类,一类是对外表面施镀进行修复的零件,如曲轴、套管、柱塞等;另一类是对内表面施镀进行修复的零件,如缸筒内孔、轴套等。同样是镀铁,内表面与外表面在施镀的方式、参数的选用等方面存在着很大的差别。查阅有关资料,结合所做的有关深孔镀铁方面的工作,我们对此作一个总结和比较。     

金属修补剂

金属修补剂系列分为：铁质修补剂、钢质修补剂、铝质修补剂、铜质修补剂四种。本系列产品具有耐温、耐油、耐水、耐老化、耐弱酸碱介质等特点。铁质修补剂主要用于箱体裂纹、铸造气孔、砂眼的填补等；钢质修补剂主要用于零件断裂、裂纹、划伤、磨损的修复，也用于铸造缺陷的填补；铝质修补剂主要用于铝件、箱体裂纹的修复，也用于铝合金铸造缺陷的修复和填补；铜质修补剂主要用于黄铜件铸造缺陷的修补和铜质导套磨损、划伤、尺寸超差的修复。可广泛用于机械、钢铁、发电等行业，有很好的市场前景。其技术指标如下： （１）涂胶４至５小时后…     

水泥混凝土路面的破碎及稳固

本文着重介绍了混凝土路面破损后的一种修复方式。作者根据实际工作情况,就破碎原路面 并补强的方法及处理的水泥混凝土路面的修复方案提出了自己的观点。     

道路翻浆的成因及初探

道路翻浆可以导致路面严重破坏,降低公路的使用寿命,同时因为车辆陷入坑里降低车速,损坏车辆机件,增加燃料消耗和汽车修理费用而造成大量经济损失。     

光肩星天牛在黑龙江省的分布及危害特征

对光肩星天牛(Anoplophora glabripennis)在黑龙江省的危害地点、危害树种及危害部位进行了调查研究,结果表明:光肩星天牛在哈尔滨市周围地区形成严重危害,主要危害树种有哈青杨、小黑杨、柳树、家榆、白桦、文冠果、糖槭、茶条槭等;危害部位大多在树干中部区域。     

Influence of stem rot pathogen <Emphasis Type="Italic">Fomitiporia</Emphasis> sp. on “Sanbu-sugi” cultivar of the Japanese cedar <Emphasis Type="Italic">Cryptomeria japonica</Emphasis>

An unidentified Fomitiporia sp. causes severe white-rot on stems of a cultivar “Sanbu-sugi” of the Japanese cedar, Cryptomeria japonica. The influence of the fungus on tree health and wood properties was determined. Bark from dead branches and xylem from living branches contained more glucose than bark from living branches and xylem from dead branches. Tree heights at which annual rings were disconnected were 2, 4 and 6 m at ages 37, 15 and 24 years old, respectively. The pH values of damaged parts were lower than those of non-damaged parts, and the damaged parts were clearly identified using bromocresol green solution. Weight loss of sapwood during 60 days of fungal degradation was 1.4 %, which was less than that by a saprophyte, Trametes versicolor. The amount of polyphenols in the heartwood from damaged tree stems was less than that from non-damaged stems. Degraded parts were less stiff than the non-degraded sapwood as measured with a wood-decay tester, Pilodyn. Our observations indicate that damaged stems are chemically and physically inferior to non-damaged stems.     

城市生态与绿地规划专题研究

绿地是城市生态系统的重要组成部分。随着城市化进程的加快，城市生态系统结构和整体功能受到了影响。从系统论和生态学方面，对城市生态进行系统化分析，指出绿地子系统的恢复功能，并依据规划原则，探讨了未来绿地规划的发展方向。     

枣树林日本龟蜡蚧种群空间结构及危害规律的研究

为了深入了解日本龟蜡蚧的发生和危害规律，对邢台市不同类型枣区日本龟蜡蚧的分布和危害情况进行了调查。结果表明，日本龟蜡蚧越冬雌成虫在枣树上的空间分布型为聚集型，个体群内和个体群间均为聚集分布；该害虫在寄主不同部位、不同方位的危害表现为：外部＞内部，南方＞西方＞东方＞北方；不同的林分类型受害程度表现为：生态环境单一的行栽婆枣林＞生态环境单一的散生慈枣林＞生态环境复杂的散生慈枣林。     

Production losses due to a summer frost in a Salix viminalis short‐rotation forest in southern Sweden

The effect of a single night frost during late spring on the current year production of two clones of Salix viminalis was determined in two monoclonal stands that displayed a gradient from virtually undamaged plants, shielded from outgoing radiation by a neighbouring spruce forest, to heavily damaged plants in the unshielded parts. Compared with the undamaged stand parts, frost caused production losses of 47% and 60% in the two clones during the first year of the second cutting cycle. The clone‐specific allometric relationship between shoot dry weight and diameter was changed by the frost in one clone, showing lower shoot weights in damaged shoots compared with undamaged shoots of the same diameter. In the other clone, allometric relations were not affected by the frost. The relative variation in weight between the stools did not differ systematically with frost damage intensity, and therefore it could not be concluded that frost in monoclonal stands would enforce a competitive hierarchy. It was inferred that the single night frost indirectly can have a negative effect on the production of the stands during the years to come.     

樟巢螟发生现状及防治对策

樟巢螟(Orthaga achatina)是为害樟科植物和壳斗科部分植物的主要食叶害虫,对寄主植物造成严重危害.文章阐述了樟巢螟的发生规律、分布与为害情况,对成灾原因进行了分析,从预测预报、人工防治、物理防治、生物防治和化学防治等方面提出了综合防治措施.     

Forest pasturing of livestock in Norway: effects on spruce regeneration

Forest pasturing of free-roaming livestock is a common practice in many parts of the world, but knowledge on how it affects tree regeneration in boreal forests is lacking. We mapped tree density, livestock site use and accumulated damage to young trees of commercial interest(Norway spruce, Picea abies L. Karst.) on 56 clearcuts inside and outside a fenced forest area used for livestock pasturing in Ringsaker, Norway. Inside the fence 56±1.8% of spruce trees were damaged compared to 37±3.4% outside. Proportion of damaged spruce trees was positively related to cattle use of the clearcut, but not so for sheep. On the most intensively used clearcuts, four out of five trees were damaged. The density of deciduous trees was five times lower inside compared to outside of the fence(varying with plant species). While livestock grazing may reduce resource competition in favour of spruce, the current animal density clearly is impeding forest regeneration in the study area.     

The formation of dry zones ìn the sapwood of conifers

Infection by Fomes annosns leads to thc formation of dry zones in conifer wood. During an investigation of the mechanism of drying it was found that water was withdrawn from infected parts of logs into uninfected parts probably by the release of hydrostatic tension. The tcnsions which exist in standing trees appearcd to be maintained in logs and to cause movement of water when the sealed tradieid system became sufficiently damaged to allow entry of air. F. annosus apparently caused this typc of clamage by enzymatic lysis in the bordered pit. However the extcnsion of dry zones beyond infection seems to imply a futher mechanism involving living xylem cells.