对纸浆白度现状的几点看法

提高纸浆的白度对改善纸页的外观及印刷性能等没有什么可置疑的，问题是在提高纸浆白度的背后有一些值得注意的问题，如：漂白化学药剂的过多投入、漂白段数的增加及其相应设备及一些基础设施的增加、纸浆漂白损失的增大以及随之而来的对植物纤维资源的浪费、过多的漂白废液的排放对环境过程造成的负效应等等。困而对纸浆白度的掌握应有一个度的考虑。     

Some effects of sound, background brightness, and economic status on the perceived size of coins and discs.

"Rich" and "poor" children estimated the size of coins and discs under sound vs. no sound conditions and 2 levels of background brightness. Contrary to prediction, no relation was found to exist between sound level and size estimation, although such a relation did exist for background brightness. The findings failed to replicate the data of Bruner and Goodman, whereas they were in substantial agreement with those of Carter and Schooler. These results were as follows: (a) large coins tended to be judged larger, and small coins judged smaller than neutral discs of comparable size; and (b) no differential effect was observed on the stimations of coins and discs as a function of economic status. There was, however, a reliable tendency for the children of lower economic status to everestimate both coins and discs when compared with those of higher status. (17 ref.) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Tracking with a differential brightness display: II. Peripheral tracking.

Tracking performances were compared using a differential brightness display (DBD) and a conventional positional display when both displays were moved to the periphery. Results of a previous study and the present study have shown that performance with the positional display was superior to performance with the DBD when the S looked directly at them. As the displays were moved to the peripheral visual areas (15°, 30°, and 45° eccentricity) the reverse of this was true, performances with the DBD were superior. This was reflected both in the actual performance scores and the amount of time S spent looking toward the displays. These results were interpreted in terms of the underlying physiology of the retina and control movements. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The vacuum packaging of a flat lamp using thermally grown carbon nano tubes

In this work, we fabricate 1-in carbon nano tubes (CNTs) flat lamp of diode and triode structure. The CNTs have been directly grown on soda-lime glass substrate by thermal growth method. To know the optimized flat lamp structure, we have simulated the electric field distribution in these structures by the Maxwell simulator. The metal-mesh grid is inserted between an anode and cathode plate for dispersion of emitted electrons and decrease of turn-on voltage, and we investigate the trajectory of emitted electrons in the triode structure. Also, we suggest the direct joint packaging method, which needs no exhausting hole and tube. The CNTs flat lamps are successfully packaged and fully emitted with high brightness. The emission and brightness properties of CNTs are investigated for various conditions.     

Tracking with a differential brightness display: I. Acquisition and transfer.

An experiment was conducted that investigated the comparative tracking performances using a differential brightness display (DBD) and a conventional positional display. The results indicated superior tracking performance with the positional display. When the percentage reduction of system error at the completion of training was computed, the differences between display groups was minimal. The inability of S to maintain precisely the same level of performance with the brightness display as with the positional display was attributed to an "area-of-uncertainty" around the reference brightness. Distinctions were made regarding performance between "early learning" and "late learning" for both displays. It was suggested that, during early learning, S established control-display relationships and learned the nature of the forcing function. During late learning, S's performance consisted of finer control adjustments. These adjustments were much finer for the positional display than for the DBD because of the area-of-uncertainty. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

LED大屏幕显示系统的对比度与亮度调节技术

提出了一种实现LED大屏幕显示系统的亮度与对比度调节技术，介绍了该技术的算法与实现电路。     

A model for structural inhomogeneities in hexagonal polyoxymethylene (POM)

Recently samples of POM have been prepared which have the X-ray powder diffraction pattern of the hexagonal form, but have a distinctly different i.r. spectrum. These observations are interpreted here as being due to a difference in the packing of the helical molecules, rather than to the presence of significantly non-standard conformations which is the usual interpretation.     

PROCESS AND PROPERTIES OF THE MODERN MULTIALKALI PHOTOCATHODE USED IN A CASCADE IMAGE INTENSIFIER

A new processing technology and the properties of multialkali antimonide photocathodesare described.The technique requires an initial antimony layer to be deposited on a fiber-optic window at asuitable temperature.After that.the layer is activated by multialkali and antimonide.Thus.the multialkaliphotocathodes named“The Modern Multialkali Photocathode”are obtained.It has been found that aphotocathode thus processed gives a sensitivity of 200 to 300μA/Im for white light at a color temperature of2854K.This paper shows the variation of photosensitivity during processing of a Modern MultialkaliPhotocathode and the variatioon of spectral sensitivity at different wavelengths.The author discusses theresults.gives a supposition of“photoemission center”,and discusses the role of Cs in multialkaliphotocathodes.     

用大功率白光LED实现高亮度背光源设计

本文以一个高亮度LED背光模块的设计为例,阐述了在用大功率白光LED实现高亮度背光设计中所要解决的若干问题,着重对背光模块中高亮度的实现、亮度的高精度调节以及背光板的散热问题进行了分析,并提出一些较为新颖且可靠的解决方案。     

The Order Parameter in Relaxors

A lamellar structure consisted of dielectric and ferroelectric slabs is considered within the continuous media theory. It is shown that, at the ferroelectric phase transition, in the ferroelectric slabs, there appears an alternating domain structure which resembles the structure studied earlier in a ferroelectric thin film with dead layers and in a ferroellastic thin films on a substrate. It is shown that the dielectric properties of this structure depend on the relative width of the dielectric and ferroelectric layers. We suggest that this microscopic model can be generating for heterogeneous ferroelectrics and, in particular, for relaxors. We show that, by using this model, it is possible to introduce an order parameter of the relaxor state in heterogeneous ferroelectrics which corresponds to a nanodomain structure. We computed strains generating by the polarization alternation, calculated neutron scattering intensities and compared them with experiment.