317 resultados para 332.274


Relevância:

10.00% 10.00%

Publicador:

Resumo:

利用窒息灭鼠弹和灭鼠雷两种新型地下鼠防治方法对高原鼢鼠(Myospalax baileyi)进行防治。结果表明:灭鼠雷的灭鼠率(86.65%)高于窒息灭鼠弹灭鼠率(59.64%)。两种方法灭鼠效果差异显著(F=96.47,P〈0.01);两种方法的春季灭鼠率(87.84%和60.39%)均高于秋季灭鼠率(85.45%和58.89%);两种方法在退耕地、幼林地和撂荒地的平均灭鼠率(66.30%)高于灌丛和次生林中的平均灭鼠率(49.65%)。结论是灭鼠雷比窒息灭鼠弹更适于防治高原鼢鼠。两种方法春季防治优于秋季,在造林时间较短的幼林地效果更好。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

目的建立了青海地区唐古特大黄药材的HPLC指纹图谱.方法采用反相高效液相色谱法,乙腈-水(0.04%的磷酸)为流动相,梯度洗脱,体积流量1.0 mL/min,检测波长为280 nm,柱温为40 C.结果精密度、重现性、稳定性试验中共有峰面积和保留时间的RSD均小于5%.青海不同采集地唐古特大黄的平均相似度为0.925.结论该方法简便、实用、可靠,可用于以青海果洛地区为主产地不同海拔唐古特大黄药材质量标准的分析检测,也为栽培大黄代替野生大黄提供理论基础.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

在室内条件下通过双通道选择实验确定艾虎(Mustela eversmanni)在通过不同气味源的场所中的取食量以及利用时间和利用频次,由此分析捕食者气味和猎物气味对艾虎取食行为的影响。研究结果表明,在无任何气味源存在时,艾虎在对照气味和对照气味组这两个场所中的取食量、活动时间和活动频次基本一致。在猎物高原鼠兔(Ochotona curzoniae)气味和对照气味组及高原鼢鼠(Myospalax baileyi)气味和对照气味组的两组实验中,艾虎在通过猎物气味的场所中的取食量、活动时间和活动频次与对照气味场所中比较也无明显的差异,但是在天敌动物赤狐(Vulpes vulpes)气味存在的条件下,艾虎明显减少在通过赤狐气味的场所中的取食量、活动时间和活动频次。同时,当间接捕食风险天敌动物赤狐气味存在时,艾虎明显增加了总的取食量,减少了在巢箱中居住的时间,而将更多的时间停留在无风险的场所中,这说明艾虎能够利用天敌动物赤狐的气味,采用增加取食量和减少高风险区域活动时间的策略来降低被捕食风险。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

对高寒草甸藏嵩草 (Kobresiatibetica)种群的繁殖对策进行了初步研究 .结果表明 :藏嵩草属寒冷中生密丛短根茎地下芽植物 ,在高寒生境中采用了以营养繁殖为主、有性繁殖为辅的繁殖策略 ,具体体现在以下几个方面 :藏嵩草种子产量nA=2 0 0 .1m-2 ,但种子萌发率较低 ,室内和野外萌发率分别仅有 4%和 2 % ,经氢氧化钠溶液和赤霉素溶液处理后的种子萌发率分别为 1%和 6 .7% ,而剥去种皮后种子萌发率达 47.3% ,所以种皮坚硬是造成种子萌发率低的主要原因 ;进入种子库、保留至返青期且具有活性的种子仅占种子总数的 31.49% ;单位面积上理论实生苗数仅为1.2 6m-2 ,与此相反 ,藏嵩草营养繁殖所形成的新个体数为 10 1.32m2 ,远远多于种子萌发所形成的实生苗数 .此外 ,藏嵩草营养繁殖效力也远高于有性繁殖效力,营养繁殖效力占总繁殖效力的83.46%(167)。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

对祁连山海北高寒草甸地区近夏至日微气象观测分析表明: (1) 14:00 (北京时,下同) 太阳总辐射瞬时值最高可达1061 W·m-2 , 净辐射、反射辐射、光合有效辐射和紫外辐射分别为670、218、380 和168 W·m-2 , 分别约为太阳总辐射的58 %、20 %、36 %和14 % , 6 月下旬日平均反射率约为0. 22 ; (2) 土壤热通量、感热通量和潜热通量瞬时值最大分别为91、274 和362 W·m-2 , 相应占净辐射的比例为20 %、38 %和42 %; (3) 地—气温度在一定范围的水平和垂直方向变化较为剧烈, 大气逆温约出现于20 :00 至次日11 :00 , 午夜01 :00 最强; (4)风速阵性强, 有显著日变化的时间性分布。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

本文提出一种基于遗传算法的轨迹规划方法,以解决操作臂的动态轨迹优化问题,并且结合智能发育的方法进行学习和训练,以保证算法的实时性,较好的解决了操作臂的实时轨迹规划问题。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

The Sawuer gold belt is located in the transition belt between Siberian plate and Kazakhstan-Junggar plate. Based on the geological and geochemical studies on the Kuoerzhenkuola and Buerkesidai gold deposits, in Sawuer gold mineralization belt, the time-space structure of mineralization and mineralizing factor are studied, the metallogenic regularity is concluded in thistheses. The ore bodies have the regularity that orebody are of the extensive and compressive in the sallow and depth of volcanic apparatue, respectively, and the vertical extension of orebody is more intensive than the horizontal extension. The gold deposits were controlled by the fractures of volcanic apparatus and regional faults, and featured by the hydrothermal alteration and metasomatism type disseminated mineralization and filling type vein mineralization. By virtue of the geological and geochemical studies on the two deposits that the formation of the two deposits are significantly related to the volcanic activity, we propose new ideas about their origin: (1) the two deposits are located in the same strata, and share the same genesis. (2) both of two deposits are volcanogenic late-stage hydrothermal gold deposits. Based on mapping of volcanic lithofacies and structure for the first time, it is discovered that a volcanic apparatus existed in the study area. Volcanic-intrusive activity can be divided into three cycles and nine lithofacies. where the two deposits are hosted in the same volcanic cycle, in this case, the wall-rock should belong to the same strata. The 40Ar-39Ar age method is employed in this work to analyze the fluid inclusions of quartz in the ore bodies from Kuoerzhenkuola and Buerkesidai gold deposits. The results show that the main mineralization occurred in 332.05 + 2.02-332.59 + 0.5IMa and 335.53 + 0.32Ma~336.78 + 0.50Ma for Kuoerzhenkuola and Buerkesidai gold deposits respectively, indicating that the two deposits are formed almost at the same time, and the metallogenic epoch of the tow deposits are close to those of the hosting rocks formed by volcanic activity of Sawuer gold belt. This geochronological study supplies new evidence for determining the timing of gold mineralization, the geneses of gold deposits? and identifies that in Hercynian period, the Altai developed tectonic-magmatic-hydrothermal mineralization of Early Carboniferous period, except known two metallogenic mineralization periods including tectonic-magmatic-hydrothermal mineralization of Devonian period and Late Carboniferous-Permian period respectively. The study of fluid inclusions indicates that the ore-forming fluid is a type of NaCl-HbO fluid with medium-low temperature and low salinity, Au is transported by the type of auric-sulfur complex (Au (HS)2-), the ore is formed in reduction condition. Hydrogen and oxygen isotopes of fluid inclusions in the major mineralizating stage show that the solutions mainly originated from magmatic water and meteoric water. The fluid mixing and water-rock reaction cause the deposition of Au. The helium and argon isotope compositions of fluid inclusions hosted in pyrite have been measured from Kuoerzhenkuola and Buerkesidai gold deposits in Sawuer gold belt. The results show that the ore-forming fluids of two deposits possessed the same source and is a mixture of mantle- and partial meteoric water-derived fluid, and the reliability of He and Ar isotopic compositions in Hercynian period is discussed. Isotopic studies including H, O, He, C, S, Pb and Sr reveal the same result that the ore-forming fluids of two deposits possessed the same source: the water derived mainly from magmatic water, partially from meteoric water; the mineralizers and ore materials derived mainly from mantle beneath the island arc, and partially from crust. The ore-forming fluids of two deposits are a mixture of mantle-derived fluids being incorporated by crust-derived fluid, and shallow partial meteoric water. Based on these results, it is proposed that the geneses of the two gold deposits are the same, being volcanogenic late-stage hydrothermal gold deposits that the ore-forming fluids filled in fractures of volcanic apparatus and metasomatized the host rocks in the volcanic apparatus. It is the first time we carried out the geophysical exploration, that is, the EH-4 continuous electrical conductivity image system measurement, the results show that relative large-size mineralizing anomalies in underground have been discovered.lt can confirm the law and genesis of the deposits mentioned above, and change the two abandoned mines to current large-size potenial exploration target.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

利用多顶砧压机,以青藏高原北喜马拉雅构造带的天然斜长角闪岩为样品,在2.0GPa,800~1000℃条件下进行了两个系列的块状样品脱水部分熔融实验:(1)保持压力p=2.0GPa,加热时间t=12h不变,改变温度(800℃~1000℃)的实验;(2)保持压力p=2.0GPa,温度T=850℃不变,改变加热时间(12~200h)的实验.结果表明,2.0GPa,加热12h的条件下,随温度升高,斜长角闪岩中依次生成了石榴石、熔体和单斜辉石,熔体的成分呈英云闪长质-花岗闪长质-英云闪长质的演化趋势.2.0GPa,850℃条件下,随加热时间增加,斜长角闪岩中依次生成了石榴石、熔体和单斜辉石,熔体的成分由英云闪长质向花岗闪长质演化.当块状岩石样品中熔体体积百分比的含量达到5%时,熔体已经相互连通.温度大于850℃的条件下生成的熔体其粘度在104Pas量级,已经满足了在地质时间尺度上熔体分凝形成岩浆的粘度要求.因此,可以认为在增厚地壳的下部,斜长角闪岩的脱水部分熔融可以形成英云闪长质-花岗质岩浆.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

以贵州省贵阳市8 046 km2 为研究区域, 将土壤中镍的空间分布规律与环境地球化学机理研究相结合, 建立镍的区域土壤环境地球化学基线, 并进行污染分析. 通过对332 个样品的分析, 得到以下结论: 贵阳市表层土壤中镍的基线值为1710 mg/ kg , 大于5710 mg/ kg 的样品可能遭受人为污染. 地质累积指数分析结果显示贵阳市1912 %的表层土壤未受镍的污染, 6317 %的表层土壤在无污染到中度污染之间, 1618 % 的中度污染, 只有013 %的表层土壤介于中度污染到强污染之间. 污染程度指数分析则显示贵阳市64 %的表层土壤未受到镍的污染, 镍的污染程度最大为1156 , 总污染程度小于0 , 即总体未受到污染.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

目的:调查贵州省燃煤型氟中毒地区的氟源。方法:测定3个典型氟中毒重病村的煤、拌煤粘土、煤饼、煤饼灰的含氟量;调查贵州省煤含氟量。结果:化落、马家庄、偏坡寨3个村子的煤氟分别为107.8、104.1、117.6mg/kg,拌煤粘土氟分别为6103.7、1900.5、2619.7mg/kg,煤饼氟分别为805.3、480.7、1713.6mg/kg,煤饼灰氟分别为639.6、332.5、841.7mg/kg;贵州省煤氟均值为115.5mg/kg.结论:氟源主要是拌煤粘土,其含氟量一般很高。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

本文综述了MINEQL + 软件的发展历史、理论基础、功能、计算的典型类型及其在地球化学中的一些应用实例。它的理论基础是化学平稳原理,包括质量平衡、能量守恒和电荷守恒定律,以及热力学上的其它一些考虑。同时介绍了该软件在处理溶液吸附问题中的理论基础,以及所包含的三种常见表面络合模型—恒电容、双层及三层模型的相同点及差异性,并运用该软件模拟了Cu2 + 在水合氧化铁上的吸附行为,模拟结果与实验结果能较好地吻合。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

通过对临沧锗矿床中基底花岗岩、矿化煤以及硅质岩的稀土元素地球化学研究认为盆地基底花岗提供了形成锗矿化的锗和形成硅质岩的硅;本区陆相热水成因硅质岩的Ce异常不明显,相对富集LREE;矿化煤相对富集HREE,这可能主要与矿化煤在含锗热液的相互作用过程中,煤对重烯土的优先富集有关。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

采用构造-沉积-成矿综合分析方法对秦岭造山带大型矿床的地质背景及构造定位进行了研究,认为秦岭泥盆绿聚矿沉积盆地位于两类大陆构造环境中,即秦岭微板声板内聚矿沉积盆地及秦岭微板块北缘被动陆缘上聚矿沉积盆地,这些聚矿盆地均属伸展盆地,提出秦岭造山带大型-超大型矿床定位模式及新勘查思想。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

一直以来同位素地球化学在气源对比研究中发挥着重要作用,天然气组分碳、氢稳定同位素已经用于判别天然气的烃源岩、源岩热演化程度和成藏过程,稀有气体同位素也已经广泛运用于天然气的来源判别。近年来,又发展了诸如流体包裹体气源对比方法,利用苯、甲苯、二甲苯、甲基环己烷等轻烃单体碳同位素气源对比方法,天然气组分的详细解剖与气源直接对比方法和气源动态综合对比方法等,这些方法促进了天然气气源对比的深入研究。比较系统地介绍了气源对比方法上的发展、创新和今后发展的一些趋势。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

豆荚状铬铁矿是蛇绿岩中特有的一类矿产,按其化学成分可分为高Cr型和高Al型两种。其中的PGE主要以RuS2和Os、Ir、Ru合金等包体形式存在,或以类质同像形式进入铬铁矿晶格。两种类型的铬铁矿均表现出负倾斜型PGE配分模式,其Pt、Pd含量相近;与高Al型铬铁矿相比,高Cr型铬铁矿有更高的Os、Ir、Ru含量,部分豆荚状铬铁矿表现出Pt、Pd相对富集的平坦到正倾斜型PGE配分模式。目前对豆荚状铬铁矿PGE含量及配分模式还缺少一个统一的解释,但其PGE地球化学可为豆荚状铬铁矿的成因及构造背景解释提供更多的信息.