Rough Screen Research Articles

Effect of rough screen on speckle suppression by wavelength and angle diversity in laser projection systems

In speckle suppression research, screens play a critical role in formation of speckle. This paper examines screen speckle using diverse light sources and screens of varying roughness. Our findings demonstrate that speckle suppression by screens is the key reason wavelength and angle diversities are not mutually independent in existing literature. Different from the theory, our experiments reveal that increased screen roughness can effectively suppress speckle for narrow-spectrum blending light source. This method also enhances the effectiveness of speckle suppression elements. These results contribute to refining current speckle evaluation models and aid in designing screens that yield lower speckle contrast.

A brief review of research on chronic disease management based on collaborative care model in China

To evaluate the situation for chronic disease management in China, and to seek the method for improving the collaborative management for chronic diseases in community. We searched literature between January 2008 and November 2013 from the Database, such as China Academic Journal Full-Text Database, and PubMed. The screening was strictly in accordance with the inclusion and exclusion criteria and a summary was made among the selected literature based on a collaboration model. We got 698 articles after rough screen and finally selected 33. All studies were involved in patient's self-management support, but only 9 studies mentioned the communication within the team, and 11 showed a clear team division of labor. Chronic disease community management in China displays some disadvantages. It really needs a general service team with clear roles and responsibilities for team members to improve the service ability of team members and provide patients with various forms of self management services.

The Multi-Scale and the Multi-Fractality Properties of Speckles on Rough Screen Surfaces

With a microscopic imaging system composed of microscopic objective, lens and CCD, we observe the complicated structures in the speckle fields on the surface of a rough screen. It is found that such structures contain ridge stripes, large platform-like grains, and shivy grains, exhibiting multiple scales in size and multiple fractalities. Simulations shows these structures are formed by different parts of the rough surface. The experimental curve of the autocorrelation function of the speckle intensity includes the three parts of the central peak, the transition part and the long tail part. Using the sum of self-affine fractal models with different scales and fractalities, we propose theoretically a triple-scale autocorrelation function to describe the speckle field. Fit of this autocorrelation function to the experimental curve gives the values of such parameters as average speckle sizes and fractalities in different scales of the speckle structures.

Evaluation of the Mini-ID Enterobacteriaceae screen system.

A total of 932 typical and atypical enteric fermenters were used to evaluate the Mini-ID Enterobacteriaceae Screen/Identification System. At 4 h, final identifications were available for only 13.3%, but an additional 71% were screened into the correct group, according to the product's database. At 24 h, 58.8% were correctly identified to the species level, often with the use of an additional tube. When 118 of the cultures were arranged into a weighted assortment, as might be found in a clinical laboratory, 35 were definitively identified at 4 h, and another 72 were screened into the correct group. Of these 72, 31 were correctly identified to the species level at 24 h, for a total of 56.0%. False-negative ornithine and incorrect L-pyrrolidonyl-beta-naphthylamide and glucuronide xylopyranoside reactions accounted for 54% of the identification errors, while database problems accounted for 10.2% of the errors. Of the eight Salmonella paratyphi A cultures, seven were missed because of a false-positive lysine reaction. At best, the system serves only as a rough screen.

Cathodoluminescence Enhancement by Coagulation of Phosphor Particles

The cathodoluminescence intensity of Y2O2S:Eu phosphor settled on nesa-coated glass plates was measured from both the gun side and the glass side. The packing density of the phosphor screens was varied by using coagulating agents during the sedimentation process. As the packing densities decreased, enhancement of the luminescence of up to 6%, was observed. This enhancement is explained by the capture of back-scattered electrons at the rough screen surfaces of the coagulated phosphor.

A Simple Multiscale Scattering Model

It has recently been conjectured that the observed statistical properties of light scattered by turbulent media arise from bunching of scattering centres. This simple picture is shown to be inconsistent with the smoothly varying gaussian model commonly adopted for the wavefront distortions introduced by a rough surface or phase screen. An alternative random function which does exhibit bunching is investigated with a view to modelling aspects of multiscale systems. The associated autocorrelation function exhibits a power-law regime extending between characteristic inner and outer scales, and this feature is reflected in the behaviour of the power spectrum for a certain range of parameter values.

The correlation of amplitude and phase fluctuations of a wave diffracted at a rough screen

The correlation of amplitude and phase fluctuations of a wave diffracted at a rough screen

The fading of radio waves weakly scattered at vertical incidence from heights near 90 km

The fading of radio waves weakly scattered at vertical incidence from heights near 90 km has been studied. Frequencies between 2 and 3 Mc/s were used. The fading rate was found to be of the order of 20 maxima per min, considerably faster than the fading rate for echoes from the normal E-region observed with the same frequency. The correlation between fading records obtained with aerials separated by about one wavelength was found to be small. The shape of the echo was found, on some occasions, to be approximately that expected for reflection from a completely rough screen. These results imply that appreciable energy is returned from directions well away from the vertical. It is shown that the fading is mainly due to random movements of the scattering elements, rather than a steady drift, and the root mean square velocity of the scatterers is found to be about 13 m sec −1.

Relationship of Short Employment Tests and General Clerical Tests

SummaryThis study sought to determine whether the Short Employment Tests (SET) were as discriminating as the General Clerical Test (GCT) in selecting and classifying two groups of office workers with different educational backgrounds.Group I was composed of male and female clerical and other office applicants who were mainly high school graduates. This group was given the GCT and the vocabulary, numerical, and clerical sub‐tests of the SET. Group II included male and female secretarial and stenographic applicants most of whom had business school or college training beyond high school. These applicants took the verbal section of the GCT and the verbal sub‐test of the SET.For the clerical applicants, the correlation (.87) between the GCT and the SET total scores indicated that the SET could satisfactorily replace the GCT in the selection procedure and reduce test administration time. For the secretarial and stenographic applicants, the correlation between the GCT‐B (Verbal) and SET Verbal was .77. The GCT‐B differentiated more finely throughout the entire score range among these better educated applicants than the SET Verbal, which was too easy a test for this group. However, the SET Verbal appeared to be useful as a rough screen for eliminating the poorest applicants. No validity data are reported.

A Clinical Evaluation of the Effectiveness of Hydryllin in the Treatment of a Variety of Dermatoses : With Observations on Effect of Placebo Therapy

Hydryllin is one of a considerable number of antihistamine compounds which have become available in recent years. While experimental studies in animals are useful in determining whether or not a particular compound has antihis-taminic effects, such experiments can serve as only a very rough screen in predicting the clinical usefulness of these drugs in man. Moreover, determination of the “anti-ailergie” effects of any compound in man is difficult at best. The functional physiology of the human animal is extremely variable in many respects, and particularly so in the group of diseases regarded as allergic.