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September 1959 - present
Publications
Publications (66)
With the growth of the quantum biology field, the study of magnetic field (MF) effects on biological processes and their potential therapeutic applications has attracted much attention. However, most biologists lack the experience needed to construct an MF exposure apparatus on their own, no consensus standard exists for exposure methods, and proto...
Concerns about the possible health effects from exposure to weak electric and magnetic (EM) fields have been debated since the early 1960s. It is now well established that biological systems respond to exposure to weak EM fields at energy levels well below the current safety guidelines which result in modification of their functionality without sig...
The present study investigated possible therapeutic effects of radiofrequency or hypomagnetic fields on the growth rate of two types of implanted tumours. To this end, mice with implanted fibrosarcoma and pancreatic tumours were exposed continuously to a 2 µT, 10 MHz radiofrequency magnetic field (MF) perpendicular to a 45 µT static MF or to a hypo...
Current limits for exposures to nonionizing electromagnetic fields (EMF) are set, based on relatively short‐term exposures. Long‐term exposures to weak EMF are not addressed in the current guidelines. Nevertheless, a large and growing amount of evidence indicates that long‐term exposure to weak fields can affect biological systems and might have ef...
Radio frequency electromagnetic fields (RF) have been shown to modify the concentrations of the radical O2-, H2O2 and cancer cell growth rates at exposure levels below those that cause significant heating. Reactive oxygen species (ROS) are both signaling molecules and species that can do damage, depending on timing, location and concentrations. We...
The rising demand for water and the need for more electricity to transport it, from remote sources to consumers, are pushing humanity to find ways to save water as well as energy. Thus, this paper presents a novel technique to optimize the control operations in water utilities, where the water distribution system is modeled as a Markov Decision Pro...
It is proposed that radical concentrations can be modified by combinations of weak, steady and alternating magnetic fields that modify the population distribution of the nuclear and electronic spin state, the energy levels and the alignment of the magnetic moments of the components of the radical pairs. In low external magnetic fields, the electron...
A major concern for much of the world today is the scarcity of potable water and energy. The rising demand for water and the need for more electricity to transport it, from remote sources to the consumers, are pushing humanity to find ways to save water as well as energy. A way to deal with those two problems and that also possess an encouraging fi...
A number of compounding issues currently encourage a different management strategy of produced water from oil, gas, and coal bed methane. Environmental and economic constraints make it desirable to deploy water and energy resources efficiently and effectively to meet the demands of our populace while maintaining and supporting environmental resourc...
Abstract— Laser micro-irradiation was used to study the uptake of low levels of strain (Janus Green B) by the mitochondria of tissue culture cells and the selective lesions induced by the irradiation. A comparison of the thermal effects produced in the cells and in a stained model system (albumin), permitted the calculation of the degree of concent...
In today's world students must learn to work in international design teams. Time, distance, cultural, and background differences need to be accommodated in order to successfully execute a design project with an international team. As a way of giving our students some experience in overcoming these barriers, a joint team of students at the Universit...
A system designed for use as an integrated starter- alternator unit in an automobile is presented in this paper. The new system utilizes a basic squirrel-cage rotor induction machine with the ability to externally switch the winding configuration for optimal performance. A conventional V/f motor controlling inverter drives the machine in starting m...
There are multiple challenges involved in teaching laboratories online. In this paper, we address the fundamental issue of deciding what laboratory material can be well presented online. This work is part of an ongoing joint effort of the University of Houston and the University of Colorado to develop remotely-controlled laboratory experiments for...
The application of electric and magnetic fields to biological systems can lead to changes that occur through a variety of physical mechanisms. These include changes in the ionic and molecular currents, changes in temperature due to heating, the lifetimes of free radicals, and the orientation of molecules. The importance of these mechanisms is a fun...
We present theoretical analysis and simulation of optical nonlinearity in asymmetric quantum well (QW) that explicitly include the effect of carriers' spatial separation. Carriers' spatial separation nonlinearity (CSSNL) has two additional significant contributions to the induced polarization beside the transition dipole moment; namely, the permane...
A joint effort between the University of Houston and the University of Colorado towards the development of an online laboratory for optical circuits courses was discussed. During the Fall 2004 term, three remote laboratory experiments were developed for ECEN 4006 Fiber Optic Communications, and the materials for the experiments consisted of simulat...
With a high dielectric material, the size of the Rotman lens (see
Rotman, W. and Turner, R.F., 1963) can be reduced by a factor of
√(ε<sub>r</sub>). Its design equations and scaling factor
can be modified and defined according to the dimensions and materials of
the lens and lines. Combining the lens with phase shifters, the lens and
antenna array c...
The purpose of this study was to develop a real-time multichannel computerized electrogastrograph (EGG) to measure and analyze electrical signals from the human abdominal surface. A soft-contact matrix composed of 25 cutaneous electrodes is embedded evenly in a latex mat. The mat can be firmly attached to the abdominal surface by drawing a vacuum b...
This paper describes the results of research on the use of vibratory tools for lunar regolith moving, cutting and penetration. It has been shown that the effort required to accomplish these tasks can be significantly decreased by forced vibration. The purpose of this research is to study the various issues through model tests, including centrifuge...
This paper will review sources of noise in biological systems including thermal noise, shot noise, 1/f noise, signals generated by the biological system, and the background environment. These noise signals will be examined for a model nerve cell and compared with estimates for the electrical and magnetic signals which are typically generated by our...
A coaxial cable can be used to reduce the magnetic and electric fields that extend into environments in the vicinity of transmission lines and distribution lines and in-house or building wiring for power distribution systems. The use of the coaxial geometry may prove useful in cases where there are environmental concerns with respect to health effe...
This paper describes a head for interfacing with a magnetic recording media. It comprises: a member of magnetic material forming at least a portion of a magnetic flux circuit ending with a pole face surface in interfacing relation to the media for establishing a main pole in proximity to the media in the magnetic flux circuit, magnetically responsi...
In this chapter we review five major sources of electric and magnetic fields. We then present some typical exposures as measured with personal dosimeters. The major sources of electric and magnetic fields to be discussed include power lines, electric railways, appliances, ground currents, and naturally generated fields, both by the body and the Ear...
The authors discuss the first use of high-temperature
superconducting films as an information recording medium in a format
that could be modified for use in a large disc drive system. The system
uses Abrikosov vortices to store integer units of magnetic flux in a
hysteresis loop. A proof-of-principle system has been assembled using a
0.3 μm film of...
Recent studies on the effects of hypo-gravity on astronauts have shown depressed response of the immune system component cells (e.g. T-lymphocytes activity) and associated bone-mass loss due to demineralization. The widespread use of various electrical stimulation techniques in fracture repair and bone growth make use of the inherent piezoelectric...
When trying to decide what task should be done by robots and what tasks should be done by humans with respect to space construction, there has been one decisive barrier which ultimately divides the tasks: can a computer do the job? Von Neumann type computers have great difficulty with problems that the human brain seems to do instantaneously and wi...
To understand what role satellites may play in Integrated Services Digital Network (ISDN), it is necessary to understand the concept of ISDN, including key organizations involved, the current status of key standards recommendations, and domestic and international progress implementation of ISDN. Each of these areas are explained. A summary of the t...
The ability to generate high quality lenses on the end of single mode optical fibers makes it possible to consider a large number of design changes in the development of a head for an optical disk system. It is these potential design changes which we wish to explore in discussing characteristics of a fiber optics head for an optical disk mass stora...
Two approaches to measuring the resistivity of thin films of semiconductors deposited onto metal plates are compared. The results of these approaches show that the microwave reflection coefficient varies with the cube of the film thickness. This is experimentally corroborated by measurements previously reported in the literature. The cubic dependen...
Graduate school, industry, or both? These are key questions facing graduating seniors in engineering. The world of work is extremely attractive: salary offers are high and besides, going to school may be getting old hat. But there are reasons to consider postponing work opportunities to go to graduate school full time.
Investigations on the biological hazards of microwave radiation (MWR) have become necessary because of the increasing domestic and industrial use of microwave equipment and the need to establish meaningful and realistic safety standards. Ultrastructural changes in mouse neuroblastoma cells, grown in vitro and exposed to MWR and to heat, are reporte...
The resistivity of thin polycrystalline films of cadmium deposited on brass substrates has been measured by a microwave technique. The samples, of the type employed in solar-cell research, form the plane reflector of a semiconfocal Fabry-Perot millimeter-wave interferometer. The resistivity is derived by field-pertubation analysis as a simple funct...
Experimental data are presented which indicate that the explosion energy of fused-quartz flashlamps is significantly higher for those lamps which have predominately compressive stresses at the surface of the lamp envelope. Techniques for increasing the mechanical strength of a flashlamp are suggested.
The applications of lasers to medicine and biology have grown very rapidly over the last decade and now include a wide variety of activities. These range from eye surgery through holographic microscopy and pattern recognition to the sealing of dental enamel. This paper reviews some of the fundamentals which underlie these applications and briefly r...
For Univ. of California, Livermore. The results of a computer ; simulation of a problem in thermoelasticity are presented. The problem is ; concerned with the dynamic stresses that are created in a hollow, cylindrical ; tube when the inside surface temperature is suddenly raised. This model was ; chosen to simulate what actually happens when a flas...
INTRODUCTION Chemical oscillations linked to the metabolic state of fibrosarcoma HT1080 cells have been measured. Interaction with these cells has been suggested to be possible by means of a properly phased electromagnetic stimulus by a mechanism that has not yet been fully understood. A resting state has been shown to have a periods significantly...
The detection statistics of a molecular beam are analyzed, taking into account fluctuations in emission, transition and detection. It is discovered that the over-all process has a Poisson distribution. Because of the nature of this distribution, it is noted that the optimum method of estimating the average number of molecular transitions is by mean...
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The characteristics of a number of different kinds of masers are reviewed to estimate their usefulness in the region between one and a tenth millimeter. An estimate of the maximum power output for these systems is made and compared with the output to be expected from mixing two optical signals in a nonlinear dielectric and on a photocathode. Additi...
This paper describes the operating characteristics of an ammonia beam maser. The simple theory for the operation is expanded to predict the angular distribution of the molecules coming from the beam collimator and the effect of the focuser on the velocity distribution of the molecules entering the cavity. Experimental results for the operation of t...