侵蚀

Thiscontributes greatly to t he uncertainty of the research result, and limits the use of cosmogenic nuclides in theresearch on soil and weathering profile.

简要介绍了土壤和风化壳剖面中宇成核素的收支情况和累积，并通过几个实例介绍了国外和境外一些土壤和风化壳的宇成核素研究情况：土壤和风化壳的年龄和表面侵蚀速率，坡地土壤的生成速率和蠕滑速率，土壤面的地貌演化过程，以及一些土壤侵蚀事件研究。

Epidermal growth factor has an important positively influence on cytotrophoblast invasion, while Transform growth factor-β〓 has a negative influence.

如表皮生长因子为一种强的促有丝分裂因子，对滋养细胞侵蚀有促进作用；而转化生长因子-β为免疫细胞抑制因子，对滋养细胞侵蚀有抑制作用。

Corrosion process of water flow could have great impact on dissolvable rock area in several decades.

岩石风化作用既是地壳固体物质形态转变的重要途径，也是产生块体运动灾害的必要前提条件，其类型和强度受区域气温及降雨条件的控制；水的侵蚀作用的区域性规律受地貌成因和气候条件的制约，它对陆地环境的最大冲击是对海洋、湖泊及水库岸滩带的侵蚀和改造；流水的溶蚀作用可在几十年内对可溶岩类地区产生影响。

Method］twelve cases with extremities invasion bone tumor were reviewed,including 6 male and 6 female.the average age was 37.1 years old.according to the mri,typeⅰtumor located in metaphysic and growth eccentricity,and was treated with outside tumor osteotomy with reservation of one side as integumentale,the cut line was shape of "匚".type ⅱ tumor was with invasion part articular surface,and was operated with part joint osteotomy with reservation of one side as integumentale,the cut line was shape of"l".type ⅲ was with invasion total joint surface and as integmentale,all tumor segment including joint could be cut,but the shape of cut close to the diaphysis was echelonment.

方法］12例侵袭性骨肿瘤患者男6例，女6例；平均年龄37.1岁。根据mri表现选择不同截骨方法，ⅰ型肿瘤位于干骺端偏心性生长，采用保留一侧皮质骨的肿瘤外截骨，截骨线呈&匚&形。ⅱ型病例肿瘤侵蚀部分关节面，采用保留一侧皮质的部分关节截骨，截骨线呈&l&形。ⅲ型病例肿瘤侵蚀整个关节面和骨皮质，可切除包括关节在内的整个瘤段骨，只是近骨干侧截骨呈阶梯状。

The relationship be-tween the erosional soil surface and the erosional soil modulus is nonlin-er,but a power relation,that is:M=

建立了土壤侵蚀面与区域侵蚀模数间的回归模型，M=

South coast of the Laizhou Bay ; coastal erosion ; erosional process ; affecting factor ; weight

莱州湾南岸；海岸侵蚀；侵蚀过程；影响因素；权重

Following the rising and dropping of sea level, river erosional base have been changed severely, while there are some erosional or siltational processes happened in vertical direction at river mouth and in its low reach, there are also with large scale migration in plain direction.

随海面升降变化，河流侵蚀基准面发生重大变化，河流河口与下游段在发生侵蚀—淤积垂向变化的过程中，平面上亦表现为大范围的迁移。

Based on the fieldwork , this paper deals with the structure of exogenic force in the north terrain of loess hilly gulied plateau in north Shaanxi Province. The author thinks that the structure research is a key to reco-gnize the feature of the local landform and its development.

根据野外初步观察，提出陕能黄土高原北部半干旱边缘地带的侵蚀营力结构问题进行讨论，分析了营力性质构成及营力结构的地域分异，对综合分析本区的土壤侵蚀问题有一定意义。

These results indicate that the geological and geomorphological conditions must be considered in order to prevent mass movements in the Loess Plateau.

因此在防治重力侵蚀过程中，必须充分地研究各地的地质地貌条件，因地制宜地防治不同类型的重力侵蚀。

Soil erosion intensity presented the characteristics of nubby discontinuous distribution in spatial, which is

采用影响度指数表示评价单元的土壤侵蚀对水质的影响程度，选择土地利用、离沟道距离、K值、坡度和侵蚀模数等作为评价影响度的影响因子，采用专家打分和综合评判法并结合GIS对土壤允许流失量进行判定；研究表明，研究区土壤允许流失量在100～500 t/km~2·a之间，且以200 t/km~2·a占绝大多数，100 t/km~2·a、300 t/km~2·a、400 t/km~2·a和500 t/km~2·a仅有零星的分布。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。