The elimination of hypo from photographic images

It is very difficult, if not impossible, to remove the last traces of hypo from photographic papers by any known procedure of washing. The sulfur in the residual hypo ultimately, and especially under abnormal conditions of temperature and humidity, combines with the silver image to form yellowish brown silver sulfide. This phenomenon is known as sulfiding or “fading” of the image. The various factors which affect the rate of fading of images and the washing out of hypo from films and papers are outlined.Chemical methods of hypo elimination have been proposed from time to time but the majority of these have not been satisfactory because they tend to leave substances such as thionates in the photographic material, which are equally as difficult to wash out as hypo and which also tend to sulfide or fade the silver image. A new hypo eliminator is recommended consisting of two volatile chemicals, hydrogen peroxide and ammonia. This eliminator oxidizes the hypo to sodium sulfate, which is inert and soluble in water, while any excess eliminator evaporates on drying.Two formulas and treatments are proposed: (1) Complete elimination of hypo for use by the professional, advanced amateur, and photofinisher who demand the highest standard of photographic quality in their prints.(2) Almost complete elimination of hypo (less than o.oi milligram per square inch).Since the conditions to which prints will be subjected are rarely known in advance, use of the “complete elimination treatment” is advised in all cases.     

网球比赛分析的几个关键点

许多运动队将全程比赛分析作为教练员的指导工具,研究己方和对方运动员的类型、战术和技术特点.网球项目中,拥有个人分析师的运动员并不多见,大部分运动员和教练员使用分析设备和程序提供的客观、可靠的反馈信息,自己进行赛前及赛后分析.很多教练员采用其他教练员的有效训练模式,因为不是所有人都有时间去分析1000h的大满贯录像来找出战术差异,但可利用他人的分析结果.赛事录像记录的客观数据提供了充足的反馈信息,教练员可根据这些反馈信息调整技战术,进行针对性的训练.     

助力训练法对于突破短跑速度障碍之探讨

根据速度障碍的成因以及突破速度障碍的理论依据,阐述了助力训练法对于突破速度障碍之有效性,分析了助力训练法所存在的局限性和缺陷,指出在具体实施过程中应根据具体情况有针对性地合理运用。     

第29届奥运会中国男排与世界强队运动员若干非技术因素的差异分析

以2008年奥运会男子排球比赛获得前四名运动队及中国男排为研究对象,运用文献法和数理统计法探讨中外排球运动员年龄、体重、身高、扣球高度、拦网高度和克托莱指数指标的差异分析,旨在从非技术因素上揭示中国男排与世界强队之问存在的差距。     

浅析养成自我锻炼习惯的手段和措施

本文采用问卷调查法,了解学生对休闲体育的认识水平及参与度,然后针对学生反馈的信息,通过课堂教学及课外休闲体育活动的组织,对如何培养学生自觉锻炼的兴趣与习惯,提出了方法、措施,为今后进一步研究学生终身体育观的建立提供依据。     

Factor structure of the Wechsler Intelligence Scale for Children-Revised,Peabody Picture Vocabulary Test,and Peabody Individual Achievement Test in a psychiatric sample

This study analyzed the factor structure of the Wechsler Intelligence Scale for Children-Revised (WISC-R), the Peabody Picture Vocabulary Test (PPVT), and the Peabody Individual Achievement Test (PIAT) in a psychiatric sample that ranged in age from 6 to 16 years (mean age = 11.1 years; SD = 3.0). The resultant factor structure of this sample was compared with patterns reported on normal and learning-disabled children. The subjects were 329 children under inpatient and outpatient care who had been referred for emotional disturbances. The results were similar to previous factor analytic studies of the WISC-R and PIAT, showing four factors: Verbal Comprehension, Verbal Achievement, Perceptual Organization, and Number Facility. The implications for the interpretation of these tests in a psychiatric sample and the appropriateness of a maximum likelihood technique in analysis of psychometric data are discussed.