Decoherence as a sequence of entanglement swaps

Standard semi-classical models of decoherence do not take explicit account of the classical information required to specify the system - environment boundary. I show that this information can be represented as a finite set of reference eigenvalues that must be encoded by any observer, including any apparatus, able to distinguish the system from its environment. When the information required for system identification is accounted for in this way, decoherence can be described as a sequence of entanglement swaps between reference and pointer components of the system and their respective environments. Doing so removes the need for the a priori assumptions of ontic boundaries required by semi-classical models.Comment: 13 pgs, 3 figures. Accepted by Results in Physic

Development of the weldbond process for joining titanium

High quality resistance spot welds were produced by welding through epoxy adhesive on titanium alloys. Weldbond joints were consistently stronger than those of either mechanical fasteners, structural adhesive bonds, or mechanical fasteners with adhesive at the joint interface. Weldbond joints and/or spot weld joints showed superior strength at all temperature ranges as compared to other joints tested

Proficiency-Based Cervical Cancer Brachytherapy Training: An Effort to Combat Recent Trends in Radiation Oncology That Result in Worse Outcomes for an Underserved Population through Resident Education

Radiation therapy is the mainstay of treatment for women with cervical cancer with disease outside of the uterine cervix. To deliver the high doses needed for cure, brachytherapy (BT) is necessary to avoid toxicity to normal tissues (1). Technique is of utmost importance for outcomes of BT, but due to a lack of training during residency, the use of BT is declining nationwide (2, 3). The effectiveness of procedural simulation training, especially proficiency-based training, has been well established in other medical specialties, but there is no simulation training for cervical cancer brachytherapy used anywhere else in the country at this time (4-8). To combat this problem, we developed and implemented a structured proficiency-based BT simulation curriculum that will be able to be modified and replicated at training programs across the country and will be particularly practical for programs with less exposure to gynecologic brachytherapy. Residents who participated in the simulation training had measurable improvements in the time to perform the procedure, applicator placement quality and confidence, which translate to fewer complications and better tumor control for patients

Motion as manipulation: Implementation of motion and force analogies by event-file binding and action planning\ud

Tool improvisation analogies are a special case of motion and force analogies that appear to be implemented pre-conceptually, in many species, by event-file binding and action planning. A detailed reconstruction of the analogical reasoning steps involved in Rutherford's and Bohr's development of the first quantized-orbit model of atomic structure is used to show that human motion and force analogies generally can be implemented by the event-file binding and action planning mechanism. Predictions that distinguish this model from competing concept-level models of analogy are discussed, available data pertaining to them are reviewed, and further experimental tests are proposed