COMPS is a web-delivered computer-mediated problem solving environment for student collaborative exploratory learning. The primary mode of interaction is typed dialogue, but COMPS also provides problem-specific affordances for exploring a problem. This paper reports qualitatively on dialogues from students employed in four different activities: two logical reasoning problems in a quantitative l...

We study spacecraft motion near a binary asteroid by means of theoretical and computational tools from geometric mechanics and dynamical systems. We model the system assuming that one of the asteroids is a rigid body (ellipsoid) and the other a sphere. In particular, we are interested in finding periodic and quasi-periodic orbits for the spacecraft near the asteroid pair that are suitable for o...

We investigate the spectrum of elementary particles and fields arising from the superposition of string configurations weighted according to their entropy in the string phase space. We find that this superposition describes a universe with a physical content phenomenologically compatible with the experimental observations and measurements. Masses and couplings are determined as functions of the...

Observations in the region of the Pribilof Islands and Canyon (PIC) reveal a clockwise circulation around the group of islands and around each of the two largest islands, St. Paul and St. George. Six current meters deployed around St. Paul Island revealed a steady clockwise flow around the island, which was strongest south of the island and weakest to the east. We use a high-resolution tidal mo...

This paper addresses the problem of detecting suspicious behavior from a collection of individuals events, where no single event is enough to decide whether his/her behavior is suspicious, but the combination of multiple events enables reasoning. We establish a Bayesian framework for evaluating multiple events and show that the current approaches lack modeling behavior history included in the e...

Aggregation of noisy observations involves a difficult tradeoff between observation quality, which can be increased by increasing the number of observations, and aggregation quality which decreases if the number of observations is too large. We clarify this behavior for a protypical system in which arbitrarily large numbers of observations exceeding the system capacity can be aggregated using l...

A specific serum factor was required for rapid phagocytosis of pathogenic staphylococci by human polymorphonuclear leukocytes when the ingestion process was studied in siliconed glass systems and the concentrations of staphylococci were maintained at low levels. In contrast to certain other microbes, the resistance to phagocytosis which characterized pathogenic staphylococci was relative, and p...

We present optical and ultraviolet spectra, lightcurves, and Doppler tomograms of the low-mass X-ray binary EXO 0748–676. Using an extensive set of 15 emission line tomograms, we show that, along with the usual emission from the stream and “hot spot”, there is extended non-axisymmetric emission from the disk rim. Some of the emission and Hα and β absorption features lend weight to the hypothesi...

background: reduction of physical activity among people is one of the most important problems of society which is resulted from life industrialization. the aim of this study was to survey knowledge and theory of planned behavior constructs inclusive attitude, intention, subjective norms and perceived behavioral control regarding girl student’s physical activity in naein payam noor university in...