出口废钢对国内炼钢质量变化的影响评价

2004年亚洲国家总的粗钢产量为5亿t，占世界粗钢产量的47％。亚洲国家对废钢的需求量较大，2003年，日本出口中国的废钢数量为2．5百万t，出口韩国的废钢数量为1．91百万t，出口台湾的废钢数量为0．9百万t。按照我们以前的研究，一直到2030年，日本产生的废钢数量会逐渐增加，亚洲国家未来对废钢需求的变化将会影响到日本国内废钢消耗和出口的数量和质量。在本文研究工作中，评价了受废钢出日影响后，国内炼钢质量的变化（用于建筑和施工的电炉钢）。将以人口平衡模型和物料收缩分析为基础的方法用于评价国内炼钢质量和废钢消耗，更新了先前关于废钢质量（含铜）和从二次消费品废钢回收比的数据。结果发现：出口到其它国家的废钢质量需求极大地影响了国内炼钢质量。     

Fe-0：5％C合金自由枝晶的长大—二三维相区模拟和LKT模型

采用带有稀薄-界面-限制参数的三维相区模型研究了Fe-0．5％C合金的自由枝晶长大过程。在不同过冷度条件下，确定了枝晶长大速度和顶端曲率半径，然后估算了合金的稳定性参数。将用相区模拟得到韵枝晶长大速度与那些通过稳定性参数LKT模型得到的结果相比较，稳定性参数为0．05，结果表明两者吻合性较好。同时讨论了LKT模型在实践应用的有效性。     

网屏针对包装印刷业的印前解决方案(续)

三、“视必达”加网 网屏结合了调幅加网及调频加网的所有优点,在印刷技术发展史上创造出崭新的混合加网方法“视必达”加网。在常规2400dpi-75线生产条件下,只要使用了“视必达”加网就能将印刷素质推至更高境界: ·实现相当于300网线以上的超精细加网质量。而且,它制作的线条没有锯齿或断裂现象。适宜于印刷各种印刷     

革命性的网点技术视必达

从过往手工分色工艺,到电子分色机,再进入九十年代的照排输出机,一直沿用传统网点的技术,虽然期间曾研发出调频网点的技术,并曾引起业界的重视,但由于受到印刷条件和操作难度的限制,因此一直未能够被广泛采用.今日,迈进CTP数码年代,市场上趋向高精细、高品质的印刷质量,一种崭新的网点技术诞生了!     

防止钻机卡钻

1改进动机Ingersoll-RandDM-L型钻机原来的吸尘罩直径是900mm，使用直径250mm的排尘软管。但当钻杆接长时，残留在吸尘罩内的钻屑就会落入钻孔引起卡钻。尤其是钻孔后，清除钻孔内的钻屑很费时间，从而导致钻孔效率降低。2改进内容①吸尘罩的直径，由900mm改为550mm；②排尘软管的直径，由250mm改为200mmo经过上述改造，大幅度地提高了集尘效果。3示意图4效果①实现了完全排出钻屑，不再卡钻；②钻孔后，清除钻屑的时间缩短，大幅度地提高了钻孔效率（改进前为14m儿，改进后为20m儿）。防止钻机卡钻@宋旭日@日本住友水泥株式会社秋芳矿采…     

Half-data-page insertion method for increasing recording density in angular multiplexing holographic memory

We have developed a method to use a half-size data page between two full-size data pages to increase the recording density in angular multiplexing holographic memory up to 1.5× as much as the conventional angular multiplexing sequence. In our recording sequence, the full- and half-size data pages are alternately multiplexed. This is because each plane wave from various points in a data page has different angular selectivity. A half-size data page has higher angular selectivity than a full-size data page. The required angular intervals were estimated by numerical simulation taking holographic medium tilt into account. Also, an angular multiplexing experiment using the half-data-page insertion method resulted in a low bit error rate of the order of 10(-3), which is sufficient for practical use.     

Survey of pesticide residues in imported frozen vegetables and fruits (1989.4~2008.3)

A survey of pesticide residues in 595 imported frozen products on the Tokyo market from April 1989 to March 2008 was carried out. Forty three kinds of pesticides, including organophosphorus, organochlorine, carbamate, pyrethroid and others, were detected between levels of trace (below 0.01 ppm) and 4.6 ppm from 162 samples. Chlorpyrifos, cypermethrin and omethoate were frequently detected in green vegetables (komatsuna leaf and spinach), cypermethrin and methamidophos were detected in pods and seeds (green soybean and string pea), chlorpropham (CIPC) was detected in potato, and captan and carbaryl were detected in berries (blueberry, raspberry and strawberry). The hydrophilic pesticide methamidophos was detected in flesh of lychee. Residue levels of these pesticides were calculated as between less than 0.5% and 30% of their ADI values according to the daily intake of frozen products. Therefore, these frozen products should be safe when they were eaten in customary amounts.     

日本镁合金行业2006年回顾与2007年预测

日本镁合金协会最近发布了2007年的需求测算和2006年的实绩。 2007年日本镁合金需求预计为： 用于结构材料12700t（比上年增长2．6％）： 用于添加材料32100t（比上年增长4．2％）：