湿固化胶粘接高含水率桦木的润湿性能与胶接性能的关系     

韦双颖  顾继友  王砥 《林产工业》2010,37(5)

欲达到良好的界面胶合或高强度的胶接接头,胶黏剂在木材表面上的润湿性是非常重要的,而含水率对木材润湿性具有极为重要的影响。以胶黏剂在桦木表面的润湿眭能为着眼点考虑胶接问题,采用单组分湿固化异氰酸酯胶黏剂粘接高含水率桦木,引入润湿模型,用平衡接触角θ和扩散-渗透系数K分别从胶滴的最终铺展状态和胶滴的扩散、渗透能力两个不同方面对润湿性能进行了描述,探讨了在高含水率条件下,桦木的润湿性能与胶接性能的内在联系。结果表明:桦木含水率从50%增大到90%时,含水率越高,桦木初始接触角越小,平衡接触角越大,扩散-渗透系数K值越小,胶液在桦木表面的润湿性能越不好,其胶接强度越低。  相似文献   

6种防霉剂对毛竹重组材的防霉效果比较     

胡迪  蒋身学 《林产工业》2012,39(5):24-26

以毛竹加缝竹篾为原料压制竹重组材,采用6种防霉剂分别对竹篾和板材试件作浸渍或涂布处理。经过1个月的防霉处理后,比较不同防霉剂、不同处理方法其防治效力的优劣,筛选出适用于毛竹重组材的2种低毒、高效防霉剂及其最佳处理方法。  相似文献   

不同氮磷钾配比对仙客来生长的影响     

刘迪  毛洪玉 《北方园艺》2010,(23):109-111

对仙客来无土栽培营养液中N、P、K元素采用三因素二次D-饱和最优设计,探讨不同浓度氮磷钾对仙客来生长发育的影响,对仙客来的根长、根体积、球茎直径、花朵数、花瓣长、可溶性糖含量、MDA含量、蛋白质含量、叶绿素含量进行分析。结果表明:经方差分析和主成分分析得出,无土栽培仙客来氮、磷、钾最优组合方案为:86.6~263.4、60~100和250~400 mg/L,即氮:磷:钾为3∶1∶6.5。  相似文献   

Establishment and characterization of fin cell lines from diploid,triploid, and tetraploid oriental weatherfish (Misgurnus anguillicaudatus)     

Xia Li  Chen Ma  Yan-Jie Qin  Ya-Juan Li  Di Wu  Li-Wen Bai  Ai-Jun Pei 《Fish physiology and biochemistry》2015,41(3):661-672

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A simplified method for measuring dilute emulsion stability     

Yiyan Wang  Shaozhuang Bian  Di Wu 《Pest management science》1995,44(2):201-203

A simple and rapid method for the assessment of the stability of diluted pesticide emulsifiable concentrates has been developed for use in China. It gives results comparable to those obtained with FAO and WHO methods. The importance of some other physical characteristics such as contact angle, surface tension and wetted area in pesticide application are also discussed.  相似文献   

Rapid communication: nucleotide sequence of chamois, alpine ibex, and red deer tRNA(Lys) and ATPase8 mitochondrial genes     

Saulle E  Di Pasquale S  Tartaglia M 《Journal of animal science》1999,77(12):3398-3399

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The identification of Mortierella wolfii isolated from cases of abortion and pneumonia in cattle and a search for its infection source     

M E Di Menna  M E Carter  D O Cordes 《Research in veterinary science》1972,13(5):439-442

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Digital Image Analysis of Internal Light Spots of Appressoria of Colletotrichum acutatum     

Diéguez-Uribeondo J  Förster H  Adaskaveg JE 《Phytopathology》2003,93(8):923-930

ABSTRACT The initial penetration process of appressoria of Colletotrichum acutatum on almond leaves was studied using digital image analysis of light micrographs and scanning electron microscopy. For image analysis, a series of sequential, partially focused digital micrographs of appressoria was analyzed to generate a single, completely focused montage image with a continuous in-focus depth of field. In studies on the development of the internal light spot (ILS), we observed that 50.4% of the appressoria formed an ILS after leaves were inoculated and incubated for 12 h at 20 degrees C, and that this increased to 95.8% after 24 h. Comparative image analyses of appressoria with and without ILSs using depth relief mapping and line profile software options showed that the ILS had a depth relief that was below that of the leaf surface. Depth relief analysis in the ILS region during incubation revealed an increase in depth in this area of up to 1.8 mum in some of the appressoria. A comparative morphological study of the ILS in montage images and the penetration pore of appressoria in scanning electron micrographs showed similar shapes and dimensions of the two structures in the appressorium. Light micrographs of histological sections confirmed fungal penetration and internal vesicle formation in almond leaves within 36 h after inoculation and incubation at 20 degrees C. This study represents the first direct evidence that the ILS in appressoria corresponds to the penetration pore and the developing penetration peg using a rapid, digital image analysis technique.  相似文献   

Use of a hydroxyapatite orbital implant in a cosmetic corneoscleral prosthesis after enucleation in a horse     

Gilger BC  Pizzirani S  Johnston LC  Urdiales NR 《Journal of the American Veterinary Medical Association》2003,222(3):343-5, 316

A hydroxyapatite orbital implant was used after enucleation of an eye from a 5-year-old performance horse. A custom-made corneoscleral prosthesis was made and fitted over the hydroxyapatite implant. The implant and surgery were well tolerated. Placement of a cosmetic prosthesis is desired after enucleation of equine eyes to allow horses to return to competition. Synthetic spheres consisting of methylmethacrylate or silicone have been used, although reported complications have included extrusion, infection, and poor cosmetic results. Hydroxyapatite orbital implants made from marine coral allow vascular and fibrous tissue growth from the host orbit into the implant, which decreases the possibility of implant extrusion or infection and allows enhanced healing of defects in the overlying conjunctiva. Extraocular muscle fixation onto the implant permits motility and assists in the prevention of implant extrusion.  相似文献   

Treatment of gastric ulceration in 10 standardbred racehorses with a pectin-lecithin complex     

Ferrucci F  Zucca E  Croci C  Di Fabio V  Ferro E 《The Veterinary record》2003,152(22):679-681

The severity of the erosive and ulcerative lesions of the squamous gastric mucosa in 10 standardbred racehorses in training was classified according to a standard scoring system. Each horse was then treated orally for 30 days with 50 g/100 kg bodyweight daily of a pectin-lecithin complex mixed into the feed. At the end of the period of treatment, the gastric lesions were re-evaluated gastroscopically and the scores were compared with those assigned at the previous evaluation. In three of the horses the gastric ulcerations had healed completely, and in six others the lesions had improved significantly.  相似文献