Optimal Co-linear Gaussian Beams for Spontaneous Parametric Down-Conversion

I investigate the properties of spontaneous parametric down-conversion (SPDC) involving co-linear Gaussian spatial modes for the pump and the photon collection optics. Approximate analytical and numerical results are obtained for the peak spectral density, photon bandwidth, pair collection probability, heralding ratio, and spectral purity, as a function of crystal length and beam focusing parameters. I address the optimization of these properties individually as well as jointly, and find focusing conditions that simultaneously bring the pair collection probability, heralding ratio, and spectral purity to near-optimal values. These properties are also found to be nearly scale invariant, that is, ultimately independent of crystal length. The results obtained here are expected to be useful for designing SPDC sources with high performance in multiple categories for the next generation of SPDC applications.Comment: 15 pages, 8 figures. Corrected normalization coefficient in eqn. 1 and a typo in the definition of wavenumber following eqn. 7. No results were affected by these correction

Seeking Understanding: Proposal for Technology as a Partial Solution to the Use of Spanish Lexical Variants in the English Medical Setting

AbstractPhysician-patient communication, essential to achieving good health outcomes, can become complicated when a native language is not shared, as is the case for many Latino patients in the United States. This communication is then enriched, but also hindered, by the diverse Latino dialects that arise in the discourse. Thus, it is imperative that providers have access to resources that promote effective communication. Until recently most medical Spanish resources have focused mainly on standard language, ignoring the use of dialect and lexical variants. This paper will briefly discuss lexical variants in the medical setting along with the challenges introduced when including them in reference materials. Then, some of the medical professionals’ needs regarding reference resources will be presented, followed by a few weaknesses inherent in those currently in use. Finally, a proposal will be offered for a system that takes these needs into consideration and seeks to facilitate the medical discourse

Application of Web Services to a Simulation Framework

The Joint Semi-Automated Forces (JSAF) simulator is an excellent tool for military training and a great testbed for new SAF behaviors. However, it has the drawback that behaviors must be ported into its own Finite State Machine (FSM) language. Web Services is a growing technology that seamlessly connects service providers to service consumers. This work attempts to merge these two technologies by modeling SAF behaviors as web services. The JSAF simulator is then modeled as a web service consumer. This approach allows new Semi-Automated Forces (SAF) behaviors to be developed independently of the simulator, which provides the developer with greater flexibility when choosing a programming language, development environment, and development platform. In addition to new SAF behaviors, this approach also supports any external component that can be modeled as a web service. Furthermore, these services are often run over a network, which distributes the computational load across several computers. Finally, hosting copies of a single service on several machines, a concept similar to file-sharing mirrors, offers an environment for load-balancing. This means if several entities are running the same behavior, a single server does not perform the computation for every entity. Instead, each entity is assigned to a specific server, increasing the quality of service seen by the system. A Web Services framework linking JSAF with several services is designed and implemented. Suppression of Enemy Air Defense (SEAD) behaviors written in MATLAB and a behavior recognition system are integrated with JSAF. These behaviors and the recognition tool were developed by other researchers, independent of this work. Results show that offloading computation to other machines is beneficial, especially when the simulation system is under heavy load. Preliminary results also indicate that load-balancing performs much better than using a single server

Correlated two-photon imaging with true thermal light

We report the first experimental demonstration of two-photon correlated imaging with true thermal light from a hollow cathode lamp. The coherence time of the source is much shorter than that of previous experiments using random scattered light from a laser. A two-pinhole mask was used as object, and the corresponding thin lens equation was well satisfied. Since thermal light sources are easier to obtain and measure than entangled light it is conceivable that they may be used in special imaging applications.Comment: 3 pages, 5 figures, accepted by Optics Letter

Chaotic imaging in frequency downconversion

We analyze and realize the recovery, by means of spatial intensity correlations, of the image obtained by a seeded frequency downconversion process in which the seed field is chaotic and an intensity modulation is encoded on the pump field. Although the generated field is as chaotic as the seed field and does not carry any information about the modulation of the pump, an image of the pump can be extracted by measuring the spatial intensity correlations between the generated field and one Fourier component of the seed

Counting Abelian Squares for a Problem in Quantum Computing

In a recent work I developed a formula for efficiently calculating the number of abelian squares of length $t+t$ over an alphabet of size $d$, where $d$ may be very large. Here I show how the expressiveness of a certain class of parameterized quantum circuits can be reduced to the problem of counting abelian squares over a large alphabet, and use the recently developed formula to efficiently calculate this quantity

Transference and Multiple Personality Disorder: Implications for Diagnosis and Treatment

The phenomena of transference, as manifested by individuals with multiple personality disorder, was examined as it related to diagnosis and management of therapy. Current definitions and diagnostic criteria for multiple personality disorder were given as well as prominent conceptualizations of the recognition and intervention of transference phenomena. Specific emphasis was placed on differential diagnosis of borderline personality disordered patients from those with multiple personality disorder in terms of similarities and differences in the manifestations and therapeutic management of transference behavior. Pierre Janet\u27s theory of the dynamics of dissociation was reviewed as support for understanding transference behavior in multiple personality disordered patients and differentiating the two patient populations

An Evaluation of the Effects of a Laboratory Learning Program On the Interpersonal Behavior of Participants

The effects of the Oregon Leadership Development Program on the assertive and aggressive behaviors of participants were measured by the scales of .the Interpersonal Behavior Survey (IBS). The program, administered by Oregon Leadership Institute (OLI), uses an experientially oriented laboratory format which includes training group (T-group) participation, brief lectures, and various interpersonal and group exercises. The program seeks to increase the interpersonal effectiveness of participants. No previous formal evaluation has been done on the OLI program and prior laboratory learning studies have not examined assertive and aggressive behaviors as outcome variables. Participants included adults who were employed by a variety of business, government, and professional organizations. The study used two treatment groups comprised of 19 male participants who attended OLI program #37 and 19 male participants who attended OLI program #38. The quasi-experimental design employed a non-equivalent comparison group comprised of 19 male participants who had not attended an OLI program and who were roughly matched on the basis of gender and occupation. All participants were administered an IBS pretest and posttest, separated by a 29-day interval. A paired samples i-test and one-way analysis of covariance (ANCOVA) were used to evaluate the two hypotheses. Data provided partial support for the first hypothesis that program participants would report increased assertive behaviors, as measured by the eight assertiveness scales of the IBS. Significant increases were found on the following scales and measured behaviors: (a) Defending Assertiveness - standing up for one\u27s rights, (b) Frankness - communicating one\u27s feelings and opinions even in the face of opposition, (c) Initiating Assertiveness - expressing one\u27s opinions and suggestions while taking a leadership role in groups, and (d) General Assertiveness, Rational - demonstrating a broad range of assertive behaviors. Data failed to support the second hypothesis that program participants would report less aggressive behaviors, as measured by the seven aggressiveness scales of the IBS. The observed changes appear consistent with the OLI program objectives and highlight the potential usefulness of the IBS assertiveness scales as outcome measures in laboratory learning research. Possible application of laboratory training to increase interpersonal competence and effectiveness of missionaries is discussed