电离层赤道异常两日振荡的数值模拟

近20年来,国外学者对电离层赤道异常问题的数值模拟研究未考虑到大气行星波对潮汐发电机电场的调制效应,因而不能解释赤道异常峰值的逐日变化.本文结果表明二日波对F_2区电子浓度的输运有很大影响.这一方法可以推广到赤道异常各种长周期行星波振荡的数值研究. 本文从非定常等离子体连续方程出发,建立包含行星波振荡对E×B漂移的调制效应的方程,并给出数值模拟的方法以及可与实际观测进行比较的结果.文中取二日波漂移振幅为U_p=0 m/s、5m/s、10m/s,而初位相分别为φ=0°、90°共四种情形进行了模拟,结果表明,二日波的调制可使赤道异常的时空分布以及异常峰值产生明显的逐日变化.在所选取的模型中,取U_p=5m/s,φ=0°所得到的f_0F_2t的二日分布特征与观测较吻合.而u_p约5m/s的变化能引起异常峰值f_0F_2约1-2MHz的起伏,而二天之内f_0F_2的二个峰值表现出约2-4MHz的起伏.     

钛-氨三乙酸-对氯苯基荧光酮-CTMAB四元配合物的分光光度法研究

本文研究Ti(Ⅳ)-氨三乙酸(NTA)-对氯苯基荧光酮(p-ClPF)-CTMAB四元配合物的显色条件。结果表明,在pH5.8—6.6形成了摩尔比为Ti(Ⅳ):NTA:p-ClPF:CTMAB=1:1:3:3的四元配合物,借此反应测定钛,灵敏度高,其ε_(573nm)=2.1×10~5L·mol~(-1)·cm~(-1)。Ti(Ⅳ)浓度在0—1.4μg/10ml范围服从比耳定律。已用本法直接测定了岩矿和铝合金中的Ti,结果满意。     

康定片麻岩岩石化学特征的初步研究

川西地区康定片麻岩(原称澄江—晋宁期岩浆岩第Ⅳ期的酸性岩)的主体是富钠质的英云闪长质-奥长花岗质片麻岩(灰色片麻岩);尚有少量花岗质片麻岩,系灰色片麻岩遭受钾质交代而成。其岩石化学特征与太古代花岗地体一致.灰色片麻岩属低铝型,以相对富铁和不具Eu异常为特征。它与川滇交界区晚太古代垭口片麻岩等一起构成川西滇中地区的片麻岩基底.     

New Investigation on the Space Group of Chevkinite

Chevkinite specimen from a rare-earth mineral deposit in Sichuan,southwest ofChina have been studied in detail by means of transmission electron microscope(TEM).The selected area electron diffraction(SAED)and convergent beam electron diffraction(CBED)patterns,obtained from different crystal zone axis direction,proved coineidently that the space group of chevkinite is C2/m.Fringe lattice image obser-vation showed the mineral crystal is structurally uniform in microscale,and it is anideal specimen for electron diffraction analysis.The mineral studied here is similar to theone from Bayan Obo,Inner Mongolia,China,in chemical composition and REE distri-bution.The chemical formula of the crystal is(Ce,La,…,Ca)_4 Fe~2-(Fe,Ti,Nb)_2O_8 (Si_2O_7)_2 .From our study,we come to the conclusion that the space group of the natu-ral chevkinite is C2/m,instead of P2_1/a as synthetic one.Up to now,chevkinitecompositionally similar to the synthetic one,in which the complete replacements of Ce,La by Nd and Fe by Mg or Co o     

Infiltration-driven dehydration and anatexis in granulite facies metagabbro, Grenville Province, Ontario, Canada

Dark hornblende + garnet-rich, quartz-absent metagabbro boudins from the Seguin subdomain, Ontario Grenville Province, are transected by anastomosing light-coloured veins rich in orthopyroxene, clinopyroxene, plagioclase and sometimes quartz. The veins vary in texture from fine-grained diffuse veins and patches that overprint the metagabbro, to coarse tonalitic leucosomes with sharp borders. The diffuse veins and patches are suggestive of channellized subsolidus dehydration of the metagabbro, while the tonalitic leucosomes are suggestive of local internally-derived anatexis. All vein types grade smoothly into each other, with the tonalitic leucosomes being the latest.
Relative to the host metagabbro, the veins have higher Si, Na, Ba & Sr, lower Fe, Mg, Ca & Ti, and similar Al. The coarser veins are enriched in K. Plagioclase becomes steadily enriched in Na in the transition from host metagabbro (An₄₇) to the veins (An₃₅), and in the coarsest veins it is antiperthitic. Differences in composition of the other minerals between host metagabbro and vein are minor. Pressure–temperature estimates are scattered, but indicate a minimum temperature during vein formation of 700°C at about 8 kbar.
Mass balance constraints indicate that the veins formed from the metagabbro in an open system. The transecting veins are interpreted to represent pathways of Si + Na + Ba + Sr ± K ± Al-enriched, low a _H2O fluids that metasomatized the host metagabbro to form the anhydrous veins. An initial period of localized solid-state dehydration of the metagabbro, represented by the diffuse veins, was followed by a transition to localized anatexis, represented by the tonalitic leucosomes. The change to anatexis may have been due to the addition of K to the infiltrating fluid. The source and delivery mechanism of the fluids is unknown.     

云南蒙自五里冲水库区F1,F2断层新活动年代研究

五里冲水库地处侵蚀山区,缺乏第四纪地层作为研究断层新活动年代的对比标志。本文以F_1、F_2断层带内发育的多期方解石脉和断层泥为研究对象,采用显微构造分析,热释光(TL)测年法和扫描电镜(SEM)分析,石英溶蚀速率测年法,对库区F_1、F_2断层新活动的年代进行综合判定。确认:F_1、F_2断层最后一次明显活动的年代分别为(2.93±0.31)×10~5年和(2.33±0.26)×10~5年以前,为评估五里冲水库构造稳定性,提供了可靠的数据。     

太阳紫外光谱及NO2光解系数的观测

本文讨论了利用自动太阳光谱仪测量地面的紫外辐射光谱,并进一步计算了NO_2的光分解系数.光谱测量范围为310—375nm.测量结果表明,在北京地区秋季NO_2的光解系数变化在(1—4)×10~(-3)S~(-1),有明显的日变化.     

银催化HDEA电化学发光法测定矿样中的痕量银

在碱性介质中,痕量Ag(Ⅰ)对新试剂6-(2-羟基-4-二乙基氨苯偶氮)-2,3-二氢-1,4-酞嗪二酮(简称HDEA)的电化学发光具有显著的催化作用。基于此,提出了HDEA-KCI-KOH体系测定矿样中痕量Ag的新方法。方法的检测限为2.0×10~(-8)mol/L Ag,线性范围为5.0×10~(-8)—3.0×10~(-6)mol/L Ag。采用巯基棉富集分离,应用本法测定一些矿样中的Ag,结果良好。     

高岭石的结晶有序度及其对纸张涂布粘浓度的影响

粘浓度是纸张涂布的一项重要指标,测定的变化范围从46.4—72％。用Hinckley方法测定了高岭石的结晶度指数,从0.57变化至1.40。当粘浓度>67％时,结晶度指数>1。粘浓度<67％,结晶度指数<1,有序高岭石有利于粘浓度提高。随着结构无序化,晶粒变小,晶片变薄,比表面增加,晶体边缘和角易破损,使粘浓度降低。结构无序化破坏了颗粒的均匀性,使颗粒长/厚比增加,粘浓度降低。高岭石八面体中Fe~(3+)的存在一定程度上影响了有序度。     

Fault－weakening effect of reservoir temperature of hot spring and its influence on seismic activities

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