明显特征

Land cover of Shanxi Province had been monitored from 1980s to 2005.Based on remote sensing and GIS technique, analysis on spatial\|temporal characteristics of land cover change and driving factors was implemented.Results show that:(1)Changing area: Area of industrial and transportation land、rural settlement and a spot of grass land is increasing, on the other side, area of dry land, irrigable land, a spot forest land and bottom land etc is decreasing.

以遥感与GIS为技术支撑，对山西省20世纪80年代到2005年的土地覆盖进行了动态监测，并分析了土地覆盖的变化特征及其驱动因子；监测表明，山西省土地覆盖时空变化特征：(1)变化数量：城镇建设用地和农村聚落面积增加显著，草地有所增加；旱地和水浇地减少明显，森林和河湖滩地略有减少。

The results showed that there were significant differences among parameters of texture feature of the different land utilization. In the desertification, the mean and variance were comparatively high. The gray level was asymmetry, the contrasts between neighboring pixels were significant; while in water and irrigable land, the mean, variance was a little bit low, the grey level was symmetry; the mean, variance and gray level in the forest and dry land was between the above (desertification and water and irrigable land).

不同土地利用类型之间纹理特征参数差异明显，荒漠化土地的均值、方差值较高，灰度分布不均匀，相邻像元反差明显，内部变化剧烈；水体和灌溉耕地的均值、方差值很低，灰度值均匀，内部变化小；林地和旱耕地信息介于上述两类土地之间。

They were well polarized and interconnected by junctional complexes. Cultured HNG cells possessed typical characteristics of normal epithelium.

透射电镜下可见明显的分泌颗粒，细胞膜表面生长微绒毛，细胞膜之间形成明显的紧密联接，具有典型的腺上皮特征。

In Angle's Class II,division 1 patients, the upper incisors labially inclined and closed up the upper lip,the lower lip reduced the covering with the upper incisors' crown.

安氏II类1分类错唇齿关系形态特征表现为：上中切牙明显唇倾并与上唇过度贴合，上唇外翻，下唇对上中切牙覆盖明显减少。

The composition, abundance and biomass of the dominant group had different characteristics in different months, the species of Lamellibranchia only had the dominant characteristics in some periods.

研究结果表明，生长季内海三棱藨草带大型底栖动物的多度和生物量整体呈上升趋势，但是月间存在一定波动变化，9月份多度最高，平均为1536ind／m^2，10月份生物量最高，平均为21.60g／m^2；不同月份优势类群组成、多度及生物量特征存在明显差异，瓣鳃类仅在部分时段表现出优势特征。

Furthermore, out of 497 fAFLP markers, 80 special bands were found to be able to distinguish the four groups from each other and may be applied for germplasm characterization and molecular assistant classification of Meretrix clam.4 Molecular classification of two species of Meretrix clam based on fAFLP and ITS sequences4.1 The results of fAFLP maker analysis of S, G and W showed that each group had their own specific loci among which there were 53 special loci in W group, much more than those of S group (14) and G group (21). Among the 53 loci, nine were all dominant loci. These unique loci could be taken as molecular markers to distinguish W from other groups. The genetic similarity indexes and distance matrix between S and G groups were 0.9585 and 0.0424 respectively, but the genetic similarity indexes and distance matrix between W group and S or G group was 0.7939 or 0.7941, and 0.2308 or 0.2305 respectively. The results revealed that significant difference existed between W and S or G groups in molecular genetic structure. The phylogenetic trees by the methods of UPGMA and NJ also indicated that S and G populations were very closely related, while W population was a relatively independent cluster, lying beyond the species which S and G belong to.4.2 The internal transcribed spacer region of the rDNA from S group, G group and W group were PCR amplified and sequenced. The results showed that the size of ITS ranged between 1266-1269bp in W group, while those in G and S groups were 1614bp and 1520bp respectively. The GC content ranged 62.32-62.62% in W group while it was 61.77% in G group. The genetic distances between three populations of W group were 0.001～0.003, but it was 0.110 or 0.147 respectively between W group and G group or S group. Phylogenetic trees by NJ method also showed that G group was very closely related to S group, while W group was a relatively independent cluster.

在457个总扩增位点中找出了53个W的特有位点，远多于S群体(14)和G(21)群体，而且在53个特有位点中有9个出现频率为100%的位点，这些位点可以作为区分其它2个群体的特征性标记；S– G群体特有的位点有112个，其中有4个位点出现频率为100%，可作为S– G群体区别于W群体的特征性标记。S群体和G群体间的遗传相似性系数为0.9585，遗传距离只有0.0424，在NJ和UPGMA法构建的亲缘关系的树状图上均首先聚在一起，说明二者的亲缘关系很近，应属于种内群体间的关系；而W与S和G的遗传相似性系数均较小(0.7939和0.7941)，相对遗传距离很大而且十分相近(0.2308和0.2305)，在亲缘关系树状图上单独分出一支，也表明W与S和G群体间的亲缘关系较远。4.2 ITS序列比较分析通过对白壳文蛤、山东文蛤和广西文蛤的ITS序列扩增电泳、PCR-RFLP分析和ITS序列分析发现，W的ITS序列长度在1266-1269 bp，而S和与G的ITS序列总长度分别为1520 bp和1614 bp；从ITS1和ITS2长度来看，W分别为739-741 bp和316-317 bp，S为895 bp和414 bp，G为987 bp和416 bp；而从ITS碱基组成来看，W的GC含量在62.32-62.62%之间，而G群体为61.77%。W的3个壳色不同群体间的遗传距离仅0.001、0.002和0.003，S与G群体间的遗传距离是0.010，说明W群体内变异很小，而S与G群体间已出现明显的遗传分化，但还均属于种内群体间的遗传变异；而W与G和S的遗传距离分别达到0.110、0.147，两个类群差异显著，已远超出种内群体间的遗传变异。

While for some indexes,such as length of medial longitudinal arch,length of lateral longitudinal arch,height of first metatarsophalangeal articulations,there is no longer changing with increasing load after adapting to a relatively lighter load.There is marked difference on the foot shapes between different items youth track man,especially for the throwers.Finally,five dimensions of foot morphological characteristics were found to establish the foot-shape-index-system,which are respectively metatarsophalangeal index,heel index,ankle index,arch of foot index and length of foot index,including 15 items.

更多载荷变化的影响；我国青年田径运动员的内侧纵弓长、外侧纵弓长、第一跖趾高、足背高、拇趾偏角、足跟面积等指标在一定载荷范围内变化明显，但超过承重范围则不再因载荷增大而变化；不同专项的青年田径运动员的足部外形指标间存在明显差异，以投掷项目运动员的差异最为突出；足长度指标、跖趾部指标、足弓部指标、足跟部指标、足踝部指标共15项内容为代表我国青年田径运动员足部外形特征的指标体系。

The characteristic of machined surface of high speed machining aluminum alloy 7050-T7451 is researched by micrographic experiments and analysis. The formation mechanics of machined metamorphism layer has been analyzed and studied. The dislocation-energy model in machined metamorphism layer was established and applied to explain the micrographic mechanics work-hardening using the thermo-mechanical coupling deformation theory and dislocation theory. The experimental results show that the interaction of high dislocation density effect on hardening is more remarkable than that of thermal stress in high speed machining.

利用显微观察方法对铝合金7050-T7451高速铣削加工的工件表面断面和不同深度的表层的微观形貌特征进行系统的研究，确定了高速切削加工铝合金7050-T7451的表面变质层深度为30～35μm；应用位错能量研究了高速铣削加工过程的热力耦合对变质层的影响机理，并通过微观形貌观察证明：与普通切削相比，高速铣削表层塑性变形的能量和位错密度更高；建立了位错密度的加工硬化的动力学模型，研究了加工硬化的热-力耦合形成机理；对微观裂纹的形成机理进行了理论分析，证明位错密度高的高速切削过程中较低速加工更容易产生明显的微裂纹，从分子级乃至原子级的水平进一步揭示高速切削加工表面变质层的形成特征。

However, we found that there are time-frequency shift between microseismic signals at different site after further investigation.

然而，通过对信号时频特征的细致分析后发现：&震前扰动&信号存在着明显的&时频偏移&现象，不完全符合&第二类脉动&的特征。

There is usually little or no progression, the EMG shows non-specific myopathic features and serum CK is normal or only slightly raised.1 The muscle biopsy may show characteristic ultrastructural abnormalities but these can be difficult to detect without specific histochemistry and/or electron microscopy that were not available in 1981 when our patient was biopsied.

经常表现为缓慢或者无明显进展，EMG提示非特异性肌源性改变特征，血清CK是正常的或者仅仅轻微的升高。肌肉活检可能表现为特征性的超微结构异常，但是这些改变必须通过特异性的组织化学和/或电镜才能观察。而在患者进行活检时的1981年这些手段是达不到的。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。