罩式退火炉的控制系统

茹尔克拉钢厂罩式退火炉由于应用于符合现代化工艺规范的仪表和分布式控制系统，而大大提高了产品的质量和产量，并使能耗显著降低。     

Small blaze angle gratings with various surface treatments for use in the extreme ultraviolet

Three replica gratings were made from a single master; two were epoxy overcoated with different thicknesses of gold, and one was replicated directly in gold. Their performance in EUV light at grazing incidence angles was measured and compared.     

非饱和水力传导系数的简易实验室测量方法

本文描述一种采用常规的实验装置在短时间内测量土层非饱和水力传导率的简易方法,称为"向上入渗法".这一方法基于在控制压力的条件下测量土的吸水量,从而来估算土层在湿润状态下的水力传导系数.将其结果与恒定加水量法、小增量压力变化法、一步法以及杰克逊理论模型的计算结果进行了比较.采用向上入渗法与采用恒定加水量法的结果很接近,但稍大于一步法而小于杰克逊理论模型的结果.这种测定方法限定负压值约为一米.     

Inherent limitations in ectomography

Ectomography, a general tomographic method currently being implemented in nuclear medicine, is described. The object is viewed from different directions from the same projection angle, and the reconstruction process can be described as a two-dimensional filtered back-projection technique. One limitation of this limited-angle approach is that a three-dimensional Fourier representation of the acquired projections has a cone where data are missing. This empty cone can cause distortions in the tomogram by insufficient elimination of details outside the reconstructed tomographic section and by distortion of details in the section. The degree of distortion is dependent on the extension of the object in all directions and on the projection angle. Despite these limitations ectomography can be superior to single-photon-emission computed tomography for imaging sections that are close and parallel to the surface of the object, as in imaging of the hip joint or the heart.     

A strident public impatience drives true change. Interview by Carolyn Dunbar

Sunquest's president and chief executive officer, Sidney Goldblatt, M.D., says the inefficient way information is shared in healthcare is "stupid" and wouldn't be tolerated in other industries. Until the public becomes impatient and strident about flagrant waste and begins to demand most cost-effective methods in healthcare, true change will take a lot longer.     

A new era dawns for the University Hospital Consortium. Interview by Carolyn Dunbar

A group of 60 university hospitals and medical centers has evolved from its original goal of gaining greater purchasing clout to a new goal: The University Hospital Consortium is becoming an information corporation, with the enormous information potential to affect treatment outcomes, practice patterns and clinical research. Sam Schultz, UHC's vice president of Information Services, tells Computers in Healthcare his organization is on the verge of a new age of discovery.