Broadband Butler Matrices with the Use of High-Pass LC Sections as Left-Handed Transmission Lines

An application of left-handed transmission line sections in Butler matrices has been investigated. It has been shown, for the first time, that the utilization of both left-handed and right-handed transmission lines allows for broadband differential phase shifters’ realization, required in the Butler matrices. A complete theoretical analysis is given, for Butler matrices incorporating ideal transmission lines of both right- and left handed types and expressions for the achievable bandwidth and differential phase deviation are derived. The presented idea has been verified by the design of a 4 x 4 Butler matrix operating in a frequency range of 2.5 – 3.5 GHz. As an artificial left-handed transmission line, an equivalent high-pass LC circuit realized in a quasi-lumped element technique, has been considered, and the resulting phase shift of such a circuit is given analytically. The obtained measurement results fully confirm the validity of the proposed idea of broadband Butler matrices’ realization

Shock tube instrumentation techniques for study of hypervelocity entry problems

Shock tube instrumentation methods for convective heat transfer study and radiative properties of high temperature gas at conditions simulating hypervelocity entr

Experimental study of equilibrium air total radiation

Experimental study of equilibrium air total radiatio

Hypervelocity heat transfer studies in simulated planetary atmospheres final report

Hypervelocity heat transfer studies in simulated planetary atmosphere

Design, development, and performance of a transient heat transfer resistance fouling monitor

Fouling can be defined as the formation of deposits on heat transfer surfaces that impede heat transfer and increase the resistance to fluid flow. The presence of fouling deposits result in the loss of equipment efficiency, the loss of equipment utilization, the requirement of additional capital expenditures, and adds the cost of cleaning to a process. The cost of fouling to all industries using heat exchangers in the United States was estimated to be 2 x 10+1 dollars per year in 1995. Thus, the control or mitigation of fouling is critical to all industries which employ heat transfer equipment. In this work, a simplified transient heat transfer resistance fouling measurement apparatus was designed and a simplified analysis protocol was formulated. The design of the apparatus was optimized through first order parametric modeling and finite difference modeling of the system. A solvent evaporation technique was utilized to deposit a film of known thickness and thermal conductivity inside the apparatus. Testing results, from before and after fouling deposition, indicate that the apparatus and analysis protocol were capable of measuring fouling thermal resistances of 2.6 m2 K/W. This measurement capability is comparable to the most sensitive fouling monitors disclosed in the open literature

Betweenness algebras

We introduce and study a class of betweenness algebras-Boolean algebras with binary operators, closely related to ternary frames with a betweenness relation. From various axioms for betweenness, we chose those that are most common, which makes our work applicable to a wide range of betweenness structures studied in the literature. On the algebraic side, we work with two operators of possibility and of suffciency.Comment: 26 pages, 2 figure

Laser Triangulation Sensor

Statement of Disclaimer: Since this project is a result of a class assignment, it has been graded and accepted as fulfillment of the course requirements. Acceptance does not imply technical accuracy or reliability. Any use of information in this report is done at the risk of the user. These risks may include catastrophic failure of the device or infringement of patent or copyright laws. California Polytechnic State University at San Luis Obispo and its staff cannot be held liable for any use or misuse of the project

Study of equilibrium air total radiation

Equilibrium radiation in air and gas mixtures assumed to represent near planet atmosphere