Present state of the catalysis problem and the theoretical basis of the search for catalysts

The following comments reflect on the present state of Peruvian-led research archaeology and its prospects for the future, from the viewpoint of a friend, colleague but notably as an outsider. As such this piece is informed by both personal experience and the informed opinions of local Peruvian investigators who, for reasons that will become apparent, have opted for anonymity. The essential premise here is that the intellectual and financial basis of archaeology in Peru is at a critical stage, and a major part of this article is to see how the next generation can negotiate this quagmire; and believe me for all the myriad problems there are important rays of light that could significantly and positively alter the state of Peruvian archaeology. With this in mind, in this brief essay I consider the research environment, the theoretical basis, and the means by which research projects and resource mitigation are carried out, and summarise some of the challenges that archaeologists living and working in Peru now face. A recent, thorough treatise of the history and state of Peruvian archaeology can be found in Shimada and Vega-Centeno (2011).

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METHODIC ISSUES OF VIBRATIONS MEASUREMENTS FOR EVALUATION OF THEIR IMPACT ON SOIL MASSIFS

Gruntovedenie ◽

10.53278/2306-9139-2021-1-16-65-77 ◽

2021 ◽

Vol 1 (16) ◽

pp. 65-77

Author(s):

V.V. Kapustin ◽

◽

M.L. Vladov ◽

V.A. Volkov ◽

E.A. Voznesensky ◽

...

Keyword(s):

Research Methods ◽

Present State ◽

Theoretical Basis ◽

Artificial Soil ◽

Geophysical Research ◽

Engineering Structures ◽

Vibration Measurements ◽

Vibration Loads ◽

Measurement And Evaluation ◽

Soil Behaviour

The paper is aimed at the attraction of attention of geologists, project engineers and those who operate engineering structures to the necessity of considering real parameters of technical vibrations from various sources in evaluation of the existing and designed soil bases as well as in methodic questions of these parameters’ measurements. In this connection the paper discusses present state of knowledge in measurement and evaluation of vibrations impact on natural and artificial soil massifs along with a brief presentation of theoretical basis of modern vibrometry. It also presents a variant of vibrations classification and discusses engineering geological and geophysical research methods for evaluation of soil behaviour under the influence of vibrations. Information from such studies is analyzed on the example of vibration loads from railway. In conclusions the paper also mentions some important issues of standards for vibration measurements development.

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Video-Enhanced Microscopy--Better Visibility of Plant Cell Structures

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100053589 ◽

1982 ◽

Vol 40 ◽

pp. 182-185

Author(s):

N.S. Allen ◽

R.D. Allen

Keyword(s):

Diffraction Pattern ◽

Theoretical Basis ◽

Numerical Aperture ◽

Gain Control ◽

Control Unit ◽

Camera Control ◽

Variable Gain ◽

Contrast Method ◽

Fine Detail ◽

Cell Structures

Various methods of video-enhanced microscopy combine TV cameras with light microscopes creating images with improved resolution, contrast and visibility of fine detail, which can be recorded rapidly and relatively inexpensively. The AVEC (Allen Video-enhanced Contrast) method avoids polarizing rectifiers, since the microscope is operated at retardations of λ/9- λ/4, where no anomaly is seen in the Airy diffraction pattern. The iris diaphram is opened fully to match the numerical aperture of the condenser to that of the objective. Under these conditions, no image can be realized either by eye or photographically. Yet the image becomes visible using the Hamamatsu C-1000-01 binary camera, if the camera control unit is equipped with variable gain control and an offset knob (which sets a clamp voltage of a D.C. restoration circuit). The theoretical basis for these improvements has been described.

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Severe Paradoxical Dysphonia in Two Young Women

American Journal of Speech-Language Pathology ◽

10.1044/1058-0360.0203.52 ◽

1993 ◽

Vol 2 (3) ◽

pp. 52-55 ◽

Cited By ~ 1

Author(s):

Michael Collins ◽

Robert McDonald ◽

Robert Stanley ◽

Timothy Donovan ◽

C. Frank Bonebrake

Keyword(s):

Young Women ◽

Theoretical Basis ◽

Therapeutic Regimen ◽

Instrumental Data ◽

Relationship Of ◽

The Relationship

This report describes an unusual and persistent dysphonia in two young women who had taken a therapeutic regimen of isotretinoin for intractable acne. We report perceptual and instrumental data for their dysphonia, and pose a theoretical basis for the relationship of dysphonia to this drug. We also provide recommendations for reducing the risk of acquiring a dysphonia during the course of treatment with isotretinoin.

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Translation Research for the Rehabilitation of Left Spatial Neglect and Associated Disorders of Attention in Stroke Patients

Perspectives on Neurophysiology and Neurogenic Speech and Language Disorders ◽

10.1044/nnsld18.2.55 ◽

2008 ◽

Vol 18 (2) ◽

pp. 55-65 ◽

Cited By ~ 2

Author(s):

Nkiruka Arene ◽

Argye E. Hillis

Keyword(s):

Theoretical Basis ◽

Attention Bias ◽

Spatial Neglect ◽

Clinical Use ◽

Stroke Patients ◽

Translation Research ◽

Unilateral Neglect ◽

Assessment And Treatment ◽

Sound Theoretical Basis ◽

Review Current

Abstract The syndrome of unilateral neglect, typified by a lateralized attention bias and neglect of contralateral space, is an important cause of morbidity and disability after a stroke. In this review, we discuss the challenges that face researchers attempting to elucidate the mechanisms and effectiveness of rehabilitation treatments. The neglect syndrome is a heterogeneous disorder, and it is not clear which of its symptoms cause ongoing disability. We review current methods of neglect assessment and propose logical approaches to selecting treatments, while acknowledging that further study is still needed before some of these approaches can be translated into routine clinical use. We conclude with systems-level suggestions for hypothesis development that would hopefully form a sound theoretical basis for future approaches to the assessment and treatment of neglect.

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