Pruning Redundant Alarm Correlation Patterns

1　ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｓｔｉｃｋｉｎｇｐｏｉｎｔｏｆａｓｓｏｃｉａｔｉｏｎｒｕｌｅａｌｇｏｒｉｔｈｍｓｄｅｐｅｎｄｓｏｎｅｆｆｅｃｔｉｖｅｌｙｆｉｎｄｉｎｇａｌｌｃｏｒｒｅｌａｔｉｏｎｐａｔｔｅｒｎｓｔｈａｔｓａｔｉｓｆｙｖａｌｕｅｒｅｑｕｉｒｅｍｅｎｔｉｎｔｈｅｍａｇｎａｎｉｍｉｔｙｏｆｄａｔａ.Ｂｕｔｔｈｅａｌｇｏｒｉｔｈｍｓａｌｓｏｂｒｉｎｇａｎｅｇａｔｉｖｅｅｆ ｆｅｃｔ:ｔｈｅｎｕｍｂｅｒｏｆａｓｓｏｃｉａｔｉｏｎｒｕｌｅｓｉｓｖｅｒｙｌａｒｇｅ.Ａｌｓｏｉｎｆｏｒｍａｔｉｏｎ…     

Nd3+ Doped Silicate Glass Photonic Crystal Fiber with Random Hole Distributions

The fabrication of one kind of large core area Nd3 doped silicate glass photonic crystal fiber, and demonstration of the fiber's waveguidence properties were reported. This fiber owns a random air hole distribution in the cladding. The measured minimum loss of this kind of fiber is 10 dB·m-1 at 660 nm. These fibers can sustain only a single mode at least over wavelength ranging from 660 nm to 980 nm.     

COORELATION ANALYSIS OF SURFACE PRESSURE FLUCTUATIONS ON THREE EQUISPACED CYLINDERS

1 .　ＩＮＴＲＯＤＵＣＴＩＯＮＡｇｒｏｕｐｏｆｃｉｒｃｕｌａｒｃｙｌｉｎｄｅｒｓｗｅｒｅｗｉｄｅｌｙａｄｏｐｔｅｄｉｎｍａｎｙｐｒａｃｔｉｃａｌｓｔｒｕｃｔｕｒｅｓｓｕｃｈａｓｃｈｉｍｎｅｙｓｔａｃｋｓ ,ｏｆｆ ｓｈｏｒｅｓｔｒｕｃｔｕｒｅｓ ,ｈｅａｔｅｘｃｈａｎｇｅｒｔｕｂｅｓａｎｄｃａｂｌｅｓｏｆｃａ ｂｌｅｓｔａｙｅｄｂｒｉｄｇｅ .Ｉｎｖｅｓｔｉｇａｔｉｏｎｓｏｎｔｈｅｆｌｏｗａｒｏｕｎｄａｓｉｎｇｌｅｃｙｌｉｎｄｅｒｈａｖｅｂｅｅｎｐｅｒｆｏｒｍｅｄｓｙｓｔｅｍａｔｉｃａｌｌｙｗｉｔｈｂｏ…     

国内外热固性塑料性能对比

根据低压电器引进技术所涉及的国外热固性塑料种类、牌号、技术参数及用途结合国内塑料现状,选出有代表性的塑料品种按相同标准方法,进行了全面性能测试和综合比较评价。确定了国内塑料可替代国外塑料用于引进电器产品的品种,分析了国内外塑料的差异,为引进电器厂家在国内选用材料时提供参考依据。     

Upconversion Luminescence of Ce^3＋ Doped BK7 Glass by Femtosecond Laser Irradiation

Near-infrared to visible upconversion luminescence was observed in a multicomponent silicate （BK7） glass containing Ce^3 ＋ ions under focused infrared femtosecond laser irradiation. The emission spectra show that the upconversion luminescence comes from the 4f-5d transition of the Ce^3 ＋ ions. The relationship between the intensity of the Ce^3 ＋ emission and the pump power reveals that a three-photon absorption predominates in the conversion process from the near-infrared into the blue luminescence. The analysis of the upconversion mechanism suggests that the upconversion luminescence may come from a three-photon simultaneous absorption that leads to a population of the 5d level in which the characteristic luminescence occurs.     

Heredity of Aluminum Melt by Electric Pulse Modification (Ⅱ)

Heredity of high pure aluminum melts under different pulse electric field was investigated by means of repetitious remelt experiment. The results indicate that the genetic coefficient by measurement of grain size of cast structure has a close relation with pulse voltage. Moreover, the hereditary law accords with the function of In = 1＋ e^-an＋β. The stability of genetic carrier （cluster） comprises in the competition between repetitious cooling and heating impulse and the effect of electric pulse modification.     

内燃机凸轮挺柱间油膜厚度的计算方法

根据弹性流体动力润滑理论对内燃机凸轴挺柱间油膜厚度的计算方法和计算公式进行了研究,修正了Holland的计算方法和计算公式,提供了一个能直接反映内燃机配气机构设计参数对凸轮挺柱间油膜厚度影响的计算方法和计算流程图。     

产品电耗定额的数理统计法初探

<正> 一、引言单位产品耗电量是衡量企业生产技术水平和管理水平的一项综合性技术经济指标,因此,怎样科学地制定出产品电耗定额,促进企业合理用电,降低能耗,挖掘内潜,是能源管理部门一件值得探讨的问题,难度在于“定额的合理性”。根据GB5623—85《产品电耗定额制定和管理导则》中所介绍的几种方法,用实测法和技术计算法来制定