吉林棉田金矿区成矿地质特征及找矿预测

棉田矿区位于吉林省东部,是以石英脉型和破碎蚀变带型为主的金矿床,区内矿产资源丰富,构造发育,为金矿富集提供了有利环境.通过总结该矿床的地质特征,分析矿床类型和成因,归纳出找矿标志,对矿区进行了成矿预测.在矿区开展了成矿预测研究,指出下一步找矿方向.     

Restoring coverage to the Bayesian false discovery rate control procedure

Principal among knowledge discovery tasks is recognition of insightful patterns or features from data that can inform otherwise challenging decisions. For the costly future decisions, there is little room for error. Features must provide substantial evidence to be robust for classification and dependable for important decisions. Here we seek statistical evidence for feature selection, that feature signals are of sufficient magnitude and frequency to be generalizable for classification. The Bayesian false discovery rate (bFDR) error control procedure is powerfully suited for this task. In realistic situations often encountered in practice, the bFDR procedure is biased, yielding a greater than desired FDR. In other less typical cases, the FDR is less than desired. We investigate the sources of bias in the bFDR procedure, and predict the direction of bias. A new algorithm has been developed to recover the bias in the bFDR control procedure. In simulation and real data mining examples, the new bFDR control algorithm shows promise. The strengths and limitations of the new approach are presented with examples and discussed.     

Characteristics of Eutectic Compositions of Restructured Palm Oil Olein,Palm Kernel Oil and Their Mixtures

The physico-chemical characteristics of blends of palm olein and palm kernel oil which were further modified by chemical interesterification were studied. The slip melting points of non-interesterified blends were 19.7, 16.2, 14.5, 14.5 and 14.4 °C while those of the chemically interesterified blends were 17.7, 16.2, 19.8, 18.7 and 18.7 °C at 40, 30, 20, 10 and 0% palm kernel oil, respectively. Chemical interesterification lowered the solid fat content of the pure samples and blends across different temperatures except 90% palm olein at 15 °C where the solid fat content was higher than for non-interesterified samples. Palm kernel oil, palm olein and their blends before and after chemical interesterification, crystallized mainly in the β′ form. However, chemical interesterification modified the microstructure from a combination of fat particles with void regions of crystalline materials to fat particles without regions of void crystalline materials. Palm olein and palm kernel oil blends are mainly used for food preparation in Nigeria. This study has shown that there are no significant differences in the physical and chemical properties of non-chemically interesterified and chemically interesterified blends of palm olein and palm kernel oil. This implies that blending of palm olein and palm kernel oil without chemical interesterification can provide the fluidity desirable at ambient temperatures for food applications in the tropics.     

Ultra-long-range OTDR in single-mode fibres at 1.3 ?m

A single-mode optical time-domain reflectometer (OTDR) operating at a wavelength of 1.3 ?m with a dynamic range in excess of 26 dB one way is reported. The equipment incorporates a semiconductor laser source and a new low-noise optical receiver design utilising a PIN diode detector and a transimpedance amplifier.     

沂南金矿床的火成岩源控制特征

沂南金矿床中的矿体类型包括断裂带型、矽卡岩型、爆破角砾岩筒型和细脉—网脉型四种。燕山晚期闪长玢岩体的侵入是不同类型矿体形成的主要因素。其成矿模式是以成矿母岩为中心、密切受其内部与外部的构造及物理-化学条件的制约而形成。沂沭断裂带两侧是寻找新的火成岩源控制的多类型金矿床远景地区。     

Intact attentional control of working memory encoding in schizophrenia.

This study reports evidence that individuals with schizophrenia (SC) demonstrate intact attentional selection for visual working memory (WM) storage. A group of 62 participants with SC and 55 control participants without SC were studied in a series of 5 experiments that examined the ability to use top-down and bottom-up cues to guide WM encoding, as well as the ability to spontaneously select a subset of representations for storage. Participants with SC exhibited a consistent and robust ability to use selective attention in the control of WM in all 5 experiments, demonstrating a remarkable island of preserved functioning given the broad spectrum of impairments of attention and WM that have been widely reported in those with SC. These findings indicate that attention is not globally impaired in SC and make it possible to delineate more precisely the nature of the specific impairment of attention in this disorder. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Deficits on the continuous performance test within the schizophrenia spectrum and the mediating effects of family history of schizophrenia.

Individuals with schizophrenia spectrum personality disorders (SSPD) and schizophrenia show similar cognitive impairments. The authors examined the contributions of SSPD symptoms and familial risk for schizophrenia to impairments on the Continuous Performance Test-Identical Pairs Version. Participants included 103 schizophrenia patients, 66 first-degree relatives (29 SSPD), and 103 community controls (26 SSPD) screened for family history of psychosis. Patients and SSPD relatives performed significantly worse than non-SSPD relatives and SSPD and non-SSPD community controls. No differences in performance were observed among non-SSPD relatives and SSPD and non-SSPD community controls. Results suggest a continuum in which risk for schizophrenia-related cognitive impairments is highest among patients and SSPD relatives, intermediate among non-SSPD relatives, and lowest among SSPD and non-SSPD community controls. Results suggest that SSPD in the absence of a family history of psychosis may be a phenocopy. (PsycINFO Database Record (c) 2010 APA, all rights reserved)