异类矿物结构基元层间层矿物研究

异类矿物结构基元层间层矿物研究曹正民，秦善，王启明（北京大学地质学系，北京１００８７１）关键词晶体化学、异类矿物结构基元层、墨铜矿矿物的间层现象是由Ｊ．Ｗ．Ｇｒｕｎｅｒ在１９３４年发现的。其中属同一大类矿物基元层交互堆叠而形成的间层矿物已有大量的研究...     

鄂西贡水砚石的工艺矿物学研究

采用X射线荧光光谱、X射线衍射图谱、紫外可见光吸收光谱等分析方法,对鄂西贡水砚石进行成分、结构的表征,用贮墨实验表征砚石的性能,对砚石开发进行可行性分析。结果表明,鄂西贡水砚石主要矿物成分为白云石、方解石、水云母以及石英。可见光谱吸收峰位于378 nm、437 nm和540 nm附近,分别为Fe3+由6A1g基态到4A1g或4Eg的跃迁、氧八面体中Fe3+的电子跃迁吸收及氧八面体中Fe2+的自旋禁戒跃迁所致。光学显微镜下矿物排列致密,孔隙度极小,多在0.01 mm以下,砚峰密度0.6~0.7个/μm2,砚石类型属于中锋砚石。不同条件下贮墨时长1.3~60.0 h。为鄂西砚石的开发提供科学依据。     

乌贼墨的有丝分裂原效应

以革胡子鲶肾血淋巴细胞为材料,采用乌贼墨——秋水仙素——低渗处理——空气干燥法制作染色体标本,检测实验组平均分裂指数为5.14%,比对照组高0.7倍。结果表明,鸟贼墨是鱼肾血淋巴细胞新的丝裂原。     

浅谈自记纸浸墨的处理方法

自记纸在使用过程中,如出现浸墨现象,会严重影响观测记录。该文根据榕江县气象局自记纸浸墨原因进行分析,并采取“预防为主、补救为辅”的原则进行有效处理。     

Molar-tooth Carbonate Sequences and Sr Isotopes in the Neoproterozoic for Stratigraphic Correlation： Research in the JUin-Liaoning-Xuzhou-Huaiyang Area of the Sino-Korean Plate and Its Correlation with the Yangtze Plate

Based on a study of Neoproterozoic carbonates in the Jilin-Liaoning-Xuzhou-Huaiyang area, especially its cyclic sequence stratigraphy and Sr isotopes, two maximum sea flooding events (at 820 Ma and 835 Ma) have been identified. The resulting isochronous stratigraphic correlation proves that these Precambrian strata were connected between the Qingbaikou and the Nanhuan systems with a time range from 750 Ma to 850 Ma. The disappearance of microsparite carbonate and coming of a glacial stage offer important evidence for worldwide stratigraphic correlation and open a window for further correlation of the stratigraphic successions across the Sino-Korean and Yangtze Plates. A new correlation scheme is therefore provided based on our work.     

Microorganisms Linked to Neoproterozoic Microspar Carbonate Sedimentation in the Jilin-Liaoning Area

Molar-tooth carbonate refers to a sort of rock that has ptygmatical folded structure comparable to the ivory. This kind of carbonate exists in a special time range (from Middle to Neoproterozoic). Its origin and the possibility to use it in stratigraphic correlation of the paleocontinent is the key task of the IGCP447, a project on Proterozoic molar tooth carbonates and the evolution of the earth (2001-2005). The importance lies in that the molar-tooth structure is the key to solving problems related to Precambrian biological and global geochemical events. The molar-tooth structure is associated with microorganisms. Development and recession of such carbonates have relations with the evolution process of early lives and abrupt changes in sea carbonate geochemistry. In recent years, based on researches on petrology, geochemistry and Sr isotope of molar-tooth carbonate in the Jilin-Liaoning and Xuzhou-Huaiyang area, the authors hold that it can be used as a marker for stratigraphic sequence and sedimentary     

EPSON系列彩色喷墨打印机的省墨方法

ＥＰＳＯＮ系列彩色喷墨打印机以其高效清淅的打印质量、简单易学的打印方法和较为适宜的价格而深受人们的欢迎。但是这种打印机耗材较贵 ,一盒黑墨总在百元以上 ,彩墨价位更高。正确使用该打印机是节省打印成本的一条可行之路 :①在打印工作没有完全结束前 ,尽量减少开关机次数 ,因为该打印机每次开机都要对打印头进行充墨 ,频繁的充墨会造成墨水的浪费。②做好防尘工作。较其它打印机而言 ,彩色喷墨打印机最怕灰尘 ,灰尘容易造成打印头的堵塞 ,在清洗打印头时 ,也会浪费掉部分墨水。因此 ,在不使用该打印机时 ,请一定要把打印机盖好。③如…     

墨铜矿的穆斯堡尔谱特征

墨铜矿是典型的异类矿物结构基元层间层矿物．在其结构中，Ｆｅ可占据硫化物层中四次配位和氢氧化物层中六次配位两种位置。本文通过穆斯堡尔谱研究，确定了墨铜矿的穆斯堡尔谱谱型，并认为高自旋的Ｆｅ２＋占据四次配位位置，与Ｃｕ离子一起可能呈无序占位，配位环境的对称性较低，谱参数为：ＩＳ＝０．４２－０．４８ｍｍ／ｓ、ＱＳ＝０．８１－１．２８ｍｍ／ｓ及Ｈｉ约为２４０ＫＯｅ；低自旋的Ｆｅ３＋占据六配位位置，ＩＳ值为０．３２－０．３６ｍｍ／ｓ、ＱＳ值为０．４４－０．５９ｍｍ／ｓ。     

一种印刷机给墨量确定方法

研究了一种印刷机给墨量确定方法,该方法依据印前拼大版数据、印刷设备性能、油墨纸张印刷适性及印刷温湿度等条件,在对印刷机传墨系统的传墨性能和油墨在纸张上的转移性能进行实验的基础上,采用给墨量与油墨转移量相平衡的控制机制,进行数学建模,计算出印刷时各色版在各墨区的给墨量,以墨区墨键开口值和传输辊的转角值给出.该算法在RIP前获得给墨量数据,且不需要印刷设备具有CIP3/CIP4接口,方便快捷,在低成本下运作,消除了长期以来印刷机给墨量凭领机的工作经验来设置的局面.经印刷实验测试,该模型计算值准确、实用有效.