一年生植物作为石膏刨花板原料的适应性

本文叙述了使用德国及中国建筑石膏和甘蔗渣、竹材、棉秆、麦秸、稻草等一年生植物生产石膏刨花板的适应性,分析了石膏的成分和性能,测定了缓凝剂和植物原料对石膏水化的影响。制板时采用不同的配方和板的密度,以评价一年生植物的使用价值。在所使用的原料中,甘蔗渣是良好的石膏刨花板原料。     

刨花板生产质量指标的优化

本文以中国一家刨花板厂为例，用该厂目前使用的原料在德国弗劳霍夫木材研究所进行系统的工艺试验。试验设计和数据计算采用数理统计方法。试验结果表明，在生产过程中某些工段采用相应措施可降低原材料消耗和改善产品质量，提高经济效益，保持一定的工艺条件，可降低施胶量３０％。     

Transgenic cattle constitute a breakthrough in production of innovative medicine. From milk to medicine

The continuously increasing demand for biomolecules, e.g. human proteins, for applications in human health care, is one of the main driving forces for the development of safe, large-scale production systems. One very promising approach is the production of biomolecules in the milk of transgenic cattle. By using nuclear transfer technology, transgenic cattle can be generated in a very safe and efficient manner, thereby offering a significant time reduction when compared to conventional breeding methods. As a result, that the transgenic cattle platform offers an efficient, safe and cost-effective method for producing large amounts of biopharmaceuticals, which is essential to the development of innovative health care products.     

Secreted antigens of Mycobacterium avium subspecies paratuberculosis as prominent immune targets

We here describe the identification and characterization of three novel secreted Mycobacterium avium subsp. paratuberculosis antigens of 9, 15 and 34 kDa (Map2609, Map2942c and Map0210c, respectively) by screening a genomic expression library with a serum of a naturally infected clinical cow. The 9, 15 and 34 kDa antigens display strong homology to previously described M. tuberculosis antigens, TB8.4, MPT53 and Erp, respectively. Furthermore, these antigens were shown to be recognized by antibodies from infected cattle, when tested with a limited number of sera from subclinical (n=7) and clinical (n=3) infected cattle.     

石膏刨花板生产的工艺设计

由联邦德国科技部(BMFT)资助中国的项目“利用木质纤维生产人造板”,是由联邦德国弗劳霍夫木材研究所(WKI)和中国林科院木材工业研究所(CRIWI)承担。现进行了半干法生产石膏刨花板的工艺设计。为了确认原材料的适用性,中国派遣一名科技人员在WKI用中国原材料进行了试验。根据当地实际情况确定该厂的年生产能力。全部生产设备可分成热能生产、石膏煅烧和板生产三部分。     

A new quantitative method for evaluation of adhesive penetration pattern in particulate wood-based composites: elemental counting method

The importance of adhesion in production of wood-based composites is well-known. Adhesive penetration and interphase morphology play an important role in bond strength and product performance. Many studies offered different methods for interphase characterization and analysis. Both qualitative and quantitative methods have been used to analyze the bondline. Most of the quantitative methods were developed for bonded assemblies of veneer or wood blocks. Adhesive penetration measurement in particulate wood-based composites is the main scope of this study. For this purpose, uniform oriented strand board with veneer strands was produced by the use of phenol formaldehyde resin with 2, 6, and 10 % strand moisture content (MC). The strands were formed into well-organized mats to achieve a uniform structure for the composite. Cross-section specimens were prepared from each board and observed by epifluorescence microscopy. Six positions for growth-ring angle in adhesive joints were denoted to evaluate penetration in different directions of the wood. Four parameters were also determined to quantify resin penetration patterns by counting the quantity of the main anatomical elements of wood, which were filled with resin. Finally, it was determined that this method could recognize the differences between adhesive penetration in boards produced with different level of strand MC. Resin penetration in strands with 6 and 10 % MC was the greatest. Growth-ring angle of the strands influenced penetration as it was increased when both strands meet each other in an oblique position, although this effect was significant only in maximum penetration depth in fibers.     

刨花板生产质量监督—数据收集和计算

质量监督对有效地管理生产和稳定产品性能至关重要。刨花板的性能与许多工艺因素有关。为保证产品质量，首先确定对产品质量有影响的工艺因素，而后收集工厂目前的生产工艺参数并进行分析和计算。文章叙述了其主要的结果，并为改善某厂的刨花板质量提出相应的措施。