模压木制品热压成型模具的设计方法

本文论述了模压木制品的热压成型模具的设计方法。针对模压木制品存在的鼓泡、合边质量差、翘曲变形等问题，通过分析，设计了一种综合性能优良的热压成型模具，以满足生产的需要     

The Effect of Treatment With Ulocladium Atrum on Botrytis Cinerea-attack of Geranium (Pelargonium Zonale) Stock Plants and Cuttings

In two successive seasons, the effect of treatment of geranium stock plants with the competitive saprophytic fungus Ulocladium atrum as a biocontrol agent against Botrytis cinerea was compared to a fungicide treatment with Euparene M. B. cinerea incidence and severity on the stock plants, B. cinerea spore load in the air around stock plants and death of cuttings due to B. cinerea were scored. B. cinerea incidence and severity were much stronger in the second than the first experiment. This was quantitatively expressed by higher numbers of conidia of B. cinerea monitored in the second than the first year, both on necrotic (a maximum for the control of 27.5 × 10⁶ spores per sample - all necrotic leaves of five plants - in experiment 1 against 86 × 10⁶ in experiment 2) and green leaves, but numbers of conidia of B. cinerea recovered from the air were only slightly different. The death rate of cuttings was moderate in the first and extremely high in the second experiment. For the fungicide treatment, maximum sample values of 7% and 76% of 6-week old cuttings were killed in the first and the second experiment respectively. Treatment with U. atrum was effective in reducing all parameters studied. With the exception of the spore load of B. cinerea in the air and the success of cuttings, the effect of U. atrum varied from as good as the fungicide to half as effective. In the first trial, only Euparene M reduced spore load in the air, in the second trial only U. atrum consistently did so. In the first trial U. atrum reduced death of 4-week old cuttings, though less than fungicide (1.2, 20 and 38% killed with fungicide treatment, U. atrum treatment and control respectively). In the second trial only the fungicide reduced loss of cuttings. The impact of the data on the integration of U. atrum in a control system of B. cinerea in geranium is discussed.     

Characterization and genetic analysis of field isolates ofBotryotinia fuckeliana (Botrytis cinerea) resistant to dichlofluanid

Field isolates ofBotryotinia fuckeliana were collected from naturally infected plants. Their responses to the multisite fungicide dichlofluanid in mycelium growth test fell into three phenotypic classes, characterized by the following EC₅₀ (and MIC) values ing ml^–1: sensitivity, 1–3 (6–10); low resistance, 3–10 (> 100); high resistance, 10–30 (> 100). The corresponding values obtained for these classes in a spore germination test were respectively: 0.05 (0.2), 0.05–0.1 (0.5), 0.5–1 (0.9–1.5). Resistant isolates were crossed with two sensitive and two resistant strains of appropriate mating type to determine the genetic basis of resistance. Distribution of resistance phenotypes in ascospore progeny indicated that a gene, namedDic1, was probably responsible for the low or high resistance of 14 mutants selectively collected from experimental plots of greenhouse-grown gerbera sprayed several times with dichlofluanid or tolyfluanid. A second gene, namedDic2, was probably responsible for the low resistance displayed by two isolates (from grapevine and from carnation) maintained in the laboratory collection. As a result of the investigation, the use of dichlofluanid in integrated management programmes against grey mould is discussed.     

植物叶片弹性模量的测量

现代农业要求对植物叶片进行高精度测量,为了确定最佳的测量力就要对植物的弹性模量进行精确测量。本文针对这一问题提出了两种测量方法,即胡克定律法和悬臂梁法。针对这两种方法分别设计了测量装置,并用这两种测量装置对同种植物进行测量,对实验数据进行误差分析。通过对这两种方法进行研究比较,筛选出一种比较准确的测量方法,本研究对植物叶片测量仪器的设计参数选择具有重要价值。     

毛竹旋片工艺技术

本文介绍了毛竹旋切片的工艺技术,包括旋切、防腐、染色、干燥,以及旋片在板材、家俱、装饰部门的各种应用。     

CMC系列防霉剂抑菌效果研究

壳聚糖金属配合物(以下简称CMC系列)是一种对环境友好的木材防腐剂,通过抑菌试验将其用于竹材防霉,结果表明:(1)CCC和CZC两种抑菌剂对于青霉、黑曲霉和木霉的抑制效果都明显高于H3BO3,且这两种抑菌剂对霉菌的抑制持续性都比较好.(2)浓度为1.8%的CCC和CZC对青霉具有较好的抑菌效果;浓度为1.0%的CCC和1.8%的CZC对黑曲霉具有较好的抑菌效果;浓度为2.2%的CCC和0.6%的CZC对木霉具有较好的抑菌效果.     

竹胶板模板用脲醛树脂胶生产工艺研究

本文对竹胶板模板用脲醛树脂胶的生产工艺和配方试验研究做了介绍。试验结果表明:在制胶工艺条件控制较好的前提下,三次缩聚制胶质量优于二次缩聚制胶质量;甲醛和尿素的克分子比以1:1.6为最佳,三次投入的尿素量分别为70％、20％、10％。     

A Study on Wall Velocity Distribution Law in Mould for C C Billets

In view of liquid steel flow in mould for C C alloy steel billets,the flow velocityof fluid in the different zones in the vicinity of vertical wall on condition of four hole nozzle hassystematically been measured by Laser Doppler Anemometre(LDA).At the same time,according tothe logarithmic wall law,logarithm ic wall law equations near by differen t wall zones and ex-periemental constan ts have been derived by regression method,The velocity distriution law near bywall in mould is obtained.     

北京地区番茄叶霉病菌致病性分化新动态

通过对北京地区番茄叶霉病菌生理小种分化的连续监测，发现了可侵染目前生产上主栽抗叶霉病品种的新小种。采用国际上通用的一套叶霉病生理小种鉴别寄主品种，利用苗期接种鉴定的方法，对新小种进行了多次小种归属鉴定，该小种属于1．2．3．4．9。与目前生产上的优势小种1．2．3和1．2．3．4相比，新小种的分化层次高，致病性更强，虽然现在还不是优势小种，但必须引起高度重视。     

复合保温管材的模具设计与研究

利用膨胀珍珠岩替代部分木质碎料,研究膨胀珍珠岩的加入量对复合保温管材导热系数、抗压强度、线性收缩率、氧指数的影响;设计制作复合保温管材的模具.