PALEOSOLS　OF　SANDY　LANDS　AND　ENVIRONMENTAL　CHANGES　IN　THE　WESTERN　PART　OF　NORTHEAST　PLAIN　OF　CHINA　WESTERN　DURING　HOLOCENE     

裘善文  李取生  夏玉梅  王景璐 《中国地理科学(英文版)》1995,5(2):137-148

ＰＡＬＥＯＳＯＬＳＯＦＳＡＮＤＹＬＡＮＤＳＡＮＤＥＮＶＩＲＯＮＭＥＮＴＡＬＣＨＡＮＧＥＳＩＮＴＨＥＷＥＳＴＥＲＮＰＡＲＴＯＦＮＯＲＴＨＥＡＳＴＰＬＡＩＮＯＦＣＨＩＮＡＷＥＳＴＥＲＮＤＵＲＩＮＧＨＯＬＯＣＥＮＥ￥ＱｉｕＳｈａｎｗｅｎ（裘善文）ＬｉＱｕｓ...  相似文献   

流动VLBI站氢原子钟的研制与性能测试     

张为群  林传富  于双林  张一平  王关忠  张健  杨佩红 《天文学报》2001,42(1):94-100

氢脉泽是射电天文所必需的频率标准.文中对为流动vLBI站研制的新一代氢脉泽的物理结构特点进行了讨论，包括对腔泡结构、磁屏蔽、原子束光学系统等.同时性能测试表明在80秒到1天之间频率稳定度优于1×10  相似文献   

The Kaidun meteorite: Mineralogy of an unusual CM1 lithology     

Michael E. ZOLENSKY  Andrei V. IVANOV  S. Vincent YANG  David W. MITTLEFEHLDT  Kazumasa OHSUMI 《Meteoritics & planetary science》1996,31(4):484-493

Abstract Kaidun is a breccia of disparate enstatite and carbonaceous chondrite clasts that continues to provide real surprises. Many Kaidun clasts have been intensely altered by aqueous fluids, as evidenced by the widespread occurrence of ferromagnesian phyllosilicates and by the presence of carbonate- and phyllo-silicate-filled veins. In this report, we describe an unusual CM lithology containing many mineralogical features not previously reported from any meteorite, including pyrrhotite, with exclusive needlelike morphologies and thick mantles of phyllosilicate, and complex aggregates of phyllosilicate, melanite garnet, crosscut by pentlandite veins. The latter features appear to be due in large part to extensive hydrothermal alteration at temperatures on the order of 450 °C, which is significantly higher than that attained during secondary processing from other known CM material.  相似文献   

现代天文选址中的视宁度（Ⅱ）     

仇朴章  刘忠 《天文学进展》1996,14(3):175-180

在文献」１「４ 基础上，根据近年文选址实践中提出的问题，先进一步讨论了大气相干直径和时间的的物理和意义，然后强调了自由大气湍流的天文成像效应及选址中进行研究和测量的重要性。最后对差分像运动方法测量视宁度的定标和系统误差等问题作了分析。  相似文献   

黑洞吸积盘的演化及温度分布的热不稳定性     

汪定雄  杨兰田  陆烨 《中国天文和天体物理学报》1994,(4)

本文在Ｔｈｏｒｎｅ工作的基础上讨论了吸积盘中黑洞的有关参量的演化，以及由Ｓｃｈｗａｒｚｓｃｈｉｌｄ黑洞吸积盘向Ｋｅｒｒ黑洞吸积盘演化过程中对吸积盘辐射通量的影响，最后针对几个典型的辐射过程，分别讨论了黑洞吸积盘在牛顿框架中的温度分布方程与广义相对论的温度分布方程的热不稳定性，并给出此类问题的热不稳定性的判据。  相似文献   

伪随机码调制的CW半导体激光雷达试制报告     

肖弟权  何建新  邱万智 《成都信息工程学院学报》1993,(4)

本文报告一种用半导体激光器作光源,用子脉冲宽度100ns,长度为511的周期伪随机码对半导体激光器的输出作幅度调制;APD作光电检测器,高速数字信号处理器TMS320C25作信号处理的激光雷达组成方案和试作样机的实验结果。  相似文献   

西部大开发中的科技伦理调控     

吴秋凤 《广东海洋大学学报》2003,23(5):94-98

在阐述西部大开发中科技主导地位的基础上 ,从科技应用成效二重性的视角 ,探讨了关注西部科技伦理的必要性 ,并初步提出了西部大开发战略的科技伦理调控机制  相似文献   

Study on Application of Polyenzyme Method to Offal of Harengula zunasi     

邓尚贵  杨萍  夏杏洲 《中国海洋湖沼学报》2003,21(4):312-318

The new polyenzyme method for making gravy from Harengula zunasi offal involves protein enzymolysis with flavorase after proper alkaline and neutral protease levels were established by orthogonal trials to select the best hydrolytic conditions for processing offal with alkaline and neutral protease. The conditions for the polyenzyme method were pH of 7.0, temperature of 50℃ , alkaline and neutral protease concentration of 1.5% respectively, hydrolysis time of 120 min, andflavorase concentration of 2.0% , for 60 min. The new gravy-making technology yields a nutritious and delicious gravy containing 40.3 % of total essential amino acids, with delicious amino acids Glu, Asp, Gly, Ala, Pro and Ser comprising 49.5% , total and amino nitrogen being respectively1.9 and 1.1 g/100 g (amino acid nitrogen being 61.0% of total nitrogen), The polyenzyme method was used to make 14.8% protein gravy from Harengula zunasi offal. In addition, in inorganic elements, the phosphorus content is the highest.  相似文献   

基于STC单片机的实验开发平台的设计     

杨明欣  张杰  郑郁正 《成都信息工程学院学报》2006,21(3):410-413

介绍了基于STC89C516RD＋单片机的实验开发平台的硬件电路设计、ISP编程、软件开发实例及系统的抗干扰措施.为帮助学生学习单片机技术,同时也为有经验者开发和调试产品打下基础.  相似文献   

2001-2002年上海天文台卫星激光测距观测报告     

杨福民  张忠萍  陈婉珍  陈菊平 《中国科学院上海天文台年刊》2003,(1)

介绍了 2 0 0 1- 2 0 0 2年上海天文台卫星激光测距观测概况和亚厘米级精度的测距实验  相似文献