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Results showed activities of tourists have hardened the soil,reduced its organism content and water content, and increased its unit weight. Basically theseverity of the effects increases with the increase of tourist activity.The former scene of arborescence is now a tourist dense area.

对森林公园土壤的研究选择了四个景区：古驿道、毛竹林、竹类园和防火瞭望台，研究结果表明游客的活动使土壤的紧实度增加，有机质含量从2.33％减少到1.33％，土壤含水率34.42％从降低到21.87％，土壤容重从1.13 g／cm3增加到1.38 g／cm3，样地受影响的严重程度依次为竹类园＞古驿道＞防火瞭望台＞毛竹林。

The molecular structure and chemical bond of Mn3O4 was analyzed by using FT-IR.

采用BET测定样品的比表面积，样品的比表面积为187 m2·g-1，孔体积为0.311991 cm3·g-1。

At present, we offer high quality high proportion fishing fall, high proportion alloy ball, high proportion alloy round stick, high proportion alloy unit, high proportion alloy golf head, high proportion alloy off-centered dipole and other high proportion alloy abnormal units. Production capacity: above 200T/year.

按合金组成特性及用途分为W-Ni-Fe、W-Ni-Cu、W-Co、W-WC-Cu、W-Ag等主要系列，其密度高达16 。5-19.0g/cm3，而被世人称为高比重合金，它还具有一系列优异的特性，比重大：一般比重为16.5-18.75g/cm3，，强度高：抗拉强度为700-1000Mpa，吸收射线能力强：其能力比铅高30-40%，导热系数大：为模具钢的5倍；热膨胀系数小：只有铁或钢的1/2-1/3，良好的可导电性能；具有良好的可焊性和加工性。

Single-axis acoustic levitation of the heaviest solid (iridium, p = 22.6g/cm3) and liquid (mercury, p = 13.6g/cm3) on the earth is achieved by greatly enhancing both the levitation force and stability through optimizing the geometric parameters of the self-developed single-axis acoustic levitator.

对自行研制的单轴式声悬浮器进行了优化设计，极大地提高了悬浮力和悬浮稳定性，首次悬浮起自然界中密度最大的固体铱(I-r，密度22.6g／cm~3)和液体汞(Hg，密度13.6g／cm~3)。

The thermally stable capability and mechanical property of the deuterated foam above were analyzed by the differential scanning calorimetry, dynamic mechanical analysis, stress-strain behavior analysis, and other methods. The results showed that the glass temperature or the decomposed temperature for the prepared foams is 100℃-120℃,or about 400℃, respectively. However, there was the irreversible change in the foams at between 50℃ and 100℃.

结果表明：1泡沫玻璃化温度在100℃-120℃，裂解温度在400℃左右；2在50℃-100℃之间和一定作用力下，泡沫存在不可逆的形变；3室温下(22℃)，随着密度增大，泡沫弹性模量增大，损耗因子减小；在泡沫密度为20 mg/cm3-160 mg/cm3时，弹性模量为2MPa-10MPa，屈服强度为0.01MPa-0.12MPa，破裂形变为5%-35%。

Usually, with the perdueterated polystyrene of molecular weight of about 250000 and disperse degree of about 3 as the materiales, the opened-cell foams with density of 0.02 g/cm3~0.1g/cm3, the average cell size of 0.2~1μm, and the deuterated ratio of more than 98% could be fabricated.

采用差式扫描量热法，动态机械性能分析仪，及万能材料机等分析测试方法对制得的氘代低密度聚苯乙烯泡沫的热性能和力学性能进行了表征分析。

The results show that:(1) Light-calcined MgO powders prepared with nature magnesite or Mg2 both are of face-centered cubic structure.

结果发现：水化前后得到的都是面心立方晶体结构的MgO，但水化前得到的轻烧MgO中仍存在官能团CO32-的残留物，而水化后得到的轻烧MgO中不存在CO32-，而且颗粒变得较易破碎，大大减少了细磨时间；再者，水化后的轻烧MgO活性较高，加上Mg2在分解过程中残留的水分对MgO 的烧结起催化作用，因此，使其经高温锻烧制得的烧结镁砂的开口气孔率由水化前的2.0%下降到0.6%，闭口气孔率由水化前的6.1%下降到2.8%，体积密度由水化前的3.29g/cm3提高到3.46g/cm3。

Perfusion in the right parietal lobe in group2 was significantly lower than in group1 (P.01).（2）Average perfusions were higher in the right temporal and parietal lobes than in the left in all 3 groups.（3）Gray matter volumes were significantly smaller in group3 than in group2 (P.05); total cerebral spinal fluidsvolumes were significantly larger in group3 than in group1 and group2（P.05）; right hippocampus volumes were significantly smaller in group3 than in group1 （P.05）. Conclusions Age-related change of cerebral blood perfusions in the healthy elderly over 65 years is characterized with hypoperfusion in the right parietal.

结果（1）经方差分析，第2组和第3组脑组织几乎所有部位的灌注均低于第1组，其中第2组右顶叶灌注的放射性计数比值为0.87±0.18，低于第1组（RAR=0.98±0.17；P.01）；（2）经配对t检验，除第2组的双侧顶叶外，3组颞叶和顶叶的灌注均为右侧高于左侧（P.01和0.05）；（3）经方差分析，第3组的灰质体积占颅内容积的百分比［（47.59±1.26）%］小于第2组［（49.43±1.30）%］，总脑脊液体积占颅内容积的百分比［（14.61±3.16）%］大于第1组［（12.41±0.73）%］和第2组［（11.94±1.27）%］，右侧海马体积［（2.04±0.23）cm3］小于第1组［（2.27±0.20）cm3］，P均。05。

High strength: Aluminum-magnesium-silicon alloy wire possesses high strength, its min value of tensile strength is 170% of the value of general hard and round aluminum wire(H8), is a fine armored material;②Low loss:as a non-magnetism material, no eddy current loss will happened on aluminum-magnesium-silicon alloy wire; when under 20℃, itsunit resistance corresponding to 52.3~53.0%IACS (international annealed copper wire standard), so that, the heat loss caused by induced current is very low;③Light weight: the density of aluminum-magnesium-silicon is only 2.7g/cm3 it largely reduced the total weight of armored cable.

该电缆突出的优点是：①高强度：铝-镁-硅合金丝具有较高的强度，其抗拉强度的最小值都是普通硬圆铝线（H8）抗拉强度的170%，是一种较好的铠装材料；②损耗小：铝-镁-硅合金丝为非磁性材料，不存在涡流损耗；其在20℃时的电阻率相52.5~53.0%IACS，因此由感应电流产生的热损耗很小；③重量轻：铝-镁-硅合金丝的密度仅为2.7g/cm3，明显降低了铠装电缆的整体重量。

The fabric made of coconut-charcoal was found that the negative ions content is more than 650pcs/cm3, the wave rate of F.I.

经抽纱制成布料后，经检测结果，负离子含量在650颗/cm3以上远红外线放射波率在 0.9以上。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。