Phase control circuits using frequency multiplications for phased array antennas

A phase control coupling circuit for use with a phased array antenna is described. The coupling circuit includes a combining circuit which is coupled to a transmission line, a frequency multiplier circuit which is coupled to the combining circuit, and a recombining circuit which is coupled between the frequency multiplier circuit and phased array antenna elements. In a doubler embodiment, the frequency multiplier circuit comprises frequency doublers and the combining and recombining circuits comprise four-port hybrid power dividers. In a generalized embodiment, the multiplier circuit comprises frequency multiplier elements which multiply to the Nth power, the combining circuit comprises four-part hybrid power dividers, and the recombinding circuit comprises summing circuits

Phased-array antenna phase control circuit using frequency multiplication

Circuit separates out, from multiplied signals, antenna element signals which have desirable phase angles and feeds them to appropriate antenna elements of phased array. System may be used in either transmitting or receiving mode

Phase interpolation circuits using frequency multiplication for phased arrays

Antenna phasing circuit is described with the following advantages - 1/ increased number of phased elements, 2/ current repetition for each array element, 3/ circuit simplicity, and 4/ accurate phase interpolation. This circuit functions with Huggins Scan or with nearly any other phasing system

Human Papillomavirus (HPV) Vaccine: Attitudes, Behaviors, and Beliefs of At-Risk Women

Cervical cancer is primarily caused by human papillomavirus (HPV) and is the second most common cause of cancer-related mortality among women. Female college students may be at risk for contracting HPV based on their sexual behavior. Following the release of the HPV vaccine, Gardasil®, this cross-sectional study was developed to (1) determine awareness of HPV and Gardasil®, (2) assess attitudes, behaviors, and beliefs about the HPV vaccine, and (3) identify information sources that female college students are accessing. Female college students voluntarily completed a self-administered questionnaire. Statistical analyses included descriptive statistics, Pearson’s correlations and paired sample t-tests. Sexually active respondents would recommend the HPV vaccine to others and disagreed that vaccination would encourage risky sexual behavior. Correlations were identified on how self-reported knowledge influenced attitudes, behaviors, and beliefs regarding the HPV vaccine. These findings should assist in developing integrated public health education efforts for HPV vaccination that are targeted towards this at-risk population

The Relationship between Resilience and Body Image in College Women

Possessing a negative body image is associated with unhealthy eating habits and eating disorders in college women and has been linked to depression and negative feelings of self worth. Limited research exists on protective factors that have the potential to mitigate body image dissatisfaction. This paper examines the relationship of resilience to body image dissatisfaction in college women. Female, undergraduate college students were studied using previously validated measures. Results indicate that increased resilience is associated with improved body image

The Double Pentaladder Integral to All Orders

We compute dual-conformally invariant ladder integrals that are capped off by pentagons at each end of the ladder. Such integrals appear in six-point amplitudes in planar N=4 super-Yang-Mills theory. We provide exact, finite-coupling formulas for the basic double pentaladder integrals as a single Mellin integral over hypergeometric functions. For particular choices of the dual conformal cross ratios, we can evaluate the integral at weak coupling to high loop orders in terms of multiple polylogarithms. We argue that the integrals are exponentially suppressed at strong coupling. We describe the space of functions that contains all such double pentaladder integrals and their derivatives, or coproducts. This space, a prototype for the space of Steinmann hexagon functions, has a simple algebraic structure, which we elucidate by considering a particular discontinuity of the functions that localizes the Mellin integral and collapses the relevant symbol alphabet. This function space is endowed with a coaction, both perturbatively and at finite coupling, which mixes the independent solutions of the hypergeometric differential equation and constructively realizes a coaction principle of the type believed to hold in the full Steinmann hexagon function space.Comment: 70 pages, 3 figures, 4 tables; v2, minor typo corrections and clarification

Bootstrapping a Five-Loop Amplitude Using Steinmann Relations

The analytic structure of scattering amplitudes is restricted by Steinmann relations, which enforce the vanishing of certain discontinuities of discontinuities. We show that these relations dramatically simplify the function space for the hexagon function bootstrap in planar maximally supersymmetric Yang-Mills theory. Armed with this simplification, along with the constraints of dual conformal symmetry and Regge exponentiation, we obtain the complete five-loop six-particle amplitude.Comment: 5 pages, 2 figures, 1 impressive table, and 2 ancillary files. v2: a few clarifications and references added; version to appear in PR

Alien Registration- Caron, Marie J. (Lewiston, Androscoggin County)

https://digitalmaine.com/alien_docs/29264/thumbnail.jp

Two-Sided Derivatives for Regular Expressions and for Hairpin Expressions

The aim of this paper is to design the polynomial construction of a finite recognizer for hairpin completions of regular languages. This is achieved by considering completions as new expression operators and by applying derivation techniques to the associated extended expressions called hairpin expressions. More precisely, we extend partial derivation of regular expressions to two-sided partial derivation of hairpin expressions and we show how to deduce a recognizer for a hairpin expression from its two-sided derived term automaton, providing an alternative proof of the fact that hairpin completions of regular languages are linear context-free.Comment: 28 page