The stability of children's physical activity as measured by accelerometry and self-report

The Computer Science Application (CSA) accelerometer uses integrated circuitry and memory to provide a continuous recording of minute-by-minute movement counts. It has been previously validated as an objective monitor of children's physical activity in field and laboratory settings. Our purpose was to derive accelerometry summary variables reflective of different physical activity intensity levels, evaluate the stability of these summary variables, and define the number of days needed to adequately measure usual physical activity. A secondary study purpose was to compare three self-report questionnaires to accelerometry. Thirty children (7-15 yr) wore accelerometers for 12 h.d-1 for 6 d. Daily summary variables of average movement count (total physical activity) and daily frequency of sedentary through vigorous activity were constructed. Intraclass correlation coefficients (R) and 95% confidence intervals (CI) were used to analyze the data. Accelerometry stability using 1 monitored day to represent usual physical activity was R = 0.42-0.47. When 6 d were used, stability increased to R = 0.81-0.84. Acceptable intraclass correlations and CI were achieved with 4 d of monitoring (R = 0.75-0.78, CI = 0.60-0.88). The self-report questionnaires were poorly to moderately correlated to accelerometry variables (r = -0.03-0.51). Data indicate that in field settings: 1) accelerometry can be used to assess the intensity of children's activity and 2) 4 or more days of activity monitoring are needed to achieve satisfactory reliability.     

Evaluation of the protracted stress in the esophageal mucosa of rats

The effect of protracted stress upon the DNA synthesis of the esophageal mucosa of the rat was investigated at various time intervals ranging from one to 56 days. A total of 80 Sprague-Dawley rats were investigated. Lots of 25 rats each were either shock-plunged, subjected to swimming in large basins for two hours or were only transported to the swimming laboratory and used as controls. The remaining 5 rats were non-transported (resting) controls. At the end of the above described procedures, all 80 rats received an intraperitoneal injection of 1 microCi3H-thymidine/gr bodyweight. one hour later the rats were killed. Half of the esophagus was processed for DNA extraction and the other half for autoradiography. When compared to day 0 (resting control rats), the DNA values in experimental animals had increased significantly at day 1, decreased significantly at day 7 in swimming rats and risen once again in both experimental groups at day 14 and more notably at day 28. By 56 days, the values had reached those of day 0. When compared to transported controls at each time interval, both experimental groups had significantly higher DNA values at day 1, significantly lower at day 7 and once again, significantly higher at day 28. Autoradiographic studies of plunged rats showed similar fluctuations in the percentage of labelled basal-parabasal cells in the esophageal mucosa at the various time intervals. The results of this work are similar to those reported previously for the gastric mucosa, the duodenal mucosa and the colonic mucosa of rats subjected to the same stressors.(ABSTRACT TRUNCATED AT 250 WORDS)     

Effects of talker familiarity on communication breakdown in conversations with adult cochlear-implant users

This investigation had three objectives: a) to determine the types of repair strategies that cochlear-implant users implement to rectify communication breakdowns during ongoing conversation when talking to either familiar or unfamiliar communication partners, b) to determine how communication partners respond to particular types of repair strategies, and c) to describe the use of conversational behaviors that might circumvent communication difficulties. In Experiment 1, cochlear-implant subjects were videotaped while talking to familiar and then unfamiliar communication partners. In Experiment 2, a second group of cochlear-implant subjects were videotaped while speaking with an unfamiliar partner for 6.5 minutes. Analysis of the videotapes revealed that the cochlear-implant subjects in the two experiments most commonly asked "what?," "huh," or "pardon?" after not recognizing a spoken message (e.g., following a communication breakdown), regardless of whether the communication partner was familiar or unfamiliar. Communication partners' more common response to this repair strategy was to repeat the original message. When cochlear-implant subjects repeated back the segment of a message that they understood, communication partners most often confirmed or corrected them. When they requested information, communication partners usually provided it. The cochlear-implant subjects were more likely to use controlling conversational behaviors when interacting with unfamiliar than familiar communication partners. We conclude that repair strategy-response adjacency pairs may emerge during spontaneous conversations. Use of both specific and nonspecific repair strategies may indicate cochlear-implant users' adherence to a cooperative principle.     

Cerebral blood flow response pattern during balloon test occlusion of the internal carotid artery

PURPOSE: To evaluate the risk of temporary or permanent internal carotid artery occlusion. METHODS: In 156 patients intraarterial balloon test occlusion in combination with a stable xenon-enhanced CT cerebral blood flow study was performed before radiologic or surgical treatment. All 156 patients passed the clinical balloon test occlusion and underwent a xenon study in combination with a second balloon test. Quantitative flow data were analyzed for absolute changes as well as changes in symmetry. RESULTS: Fourteen patients exhibited reduced flow values between 20 and 30 mL/100 g per minute, an absolute decrease in flow, and significant asymmetry in the middle cerebral artery territory during balloon test occlusion. These patients would be considered at high risk for cerebral infarction if internal carotid artery occlusion were to be performed. With one exception they belonged to a group (class I) of 61 patients who showed bilateral or ipsilateral flow decrease and significant asymmetry with lower flow on the side of occlusion. The other 95 patients, who showed a variety of cerebral blood flow response patterns including ipsilateral or bilateral flow increase, were at moderate (class II) or low (class III) stroke risk. In contrast to these findings, exclusively qualitative flow analysis failed to identify the patients at high risk: a threshold with an asymmetry index of 10% revealed only 16% specificity whereas an asymmetry index of 45% showed only 61% sensitivity for detection of low flow areas (< 30 mL/100 g per minute). CONCLUSION: For achieving a minimal hemodynamic related-stroke rate associated with permanent clinical internal carotid artery occlusion we suggest integration of a thorough analysis of quantitative cerebral blood flow data before and during balloon test occlusion.     

Starch as a Pore‐forming and Body‐forming Agent in Ceramic Technology

Wheat and corn starch can be used for the preparation of porous alumina ceramics via the SCC (starch consolidation casting) process, resulting in porosities ranging from > 20% to approx. 50% (using nominal starch contents of 10 – 50%, v/v), with open porosity dominating (closed porosity < 6.5%). The character of porosity and the shape of the pores corresponds to the starch granules used, but the pore size is determined by a complex interplay between starch swelling (during the body‐forming step) and pore shrinkage (during sintering of the ceramic). Typically, for low starch contents (e.g. nominal starch contents of around 10%, v/v) starch swelling is a significant effect, and the pores after sintering are larger than the size of the starch granules. For higher starch contents swelling is constrained (by limited space and/ or water availability), and the matrix shrinkage during sintering overcompensates the swelling effect, so that the final pores in the ceramic can be significantly smaller than the original starch granule size. In this paper it is shown how porosity is related to pore size. In particular, it is demonstrated that the porosity indirectly determined from image analysis (via the median pore size) is closely related to the porosity directly measured via the Archimedes method. On the other hand, mercury porosimetry measures the distribution of pore throat sizes. With increasing starch content in the suspension, the pore throat size in the as‐fired ceramic materials increases, resulting in a more open microstructure.     

Service employees give as they get: Internal service as a moderator of the service climate–service outcomes link.

We lend theoretical insight to the service climate literature by exploring the joint effects of branch service climate and the internal service provided to the branch (the service received from corporate units to support external service delivery) on customer-rated service quality. We hypothesized that service climate is related to service quality most strongly when the internal service quality received is high, providing front-line employees with the capability to deliver what the service climate motivates them to do. We studied 619 employees and 1,973 customers in 36 retail branches of a bank. We aggregated employee perceptions of the internal service quality received from corporate units and the local service climate and external customer perceptions of service quality to the branch level of analysis. Findings were consistent with the hypothesis that high-quality internal service is necessary for branch service climate to yield superior external customer service quality. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

Gehry Partners' Fondation Louis Vuitton: Crowdsourcing Embedded Intelligence

The complexity of the mass-customised forms of Gehry Partners' new art museum in Paris, the Fondation Louis Vuitton pour la création, has taken high-definition simulation techniques and embedded intelligence to a new level. Tobias Nolte and Andrew Witt of Gehry Technologies describe how the realisation of the Fondation required the development of a 3D concurrent design system that could synchronise hundreds of participants. This self-optimisation system has enabled both ‘intricate collaboration and unprecedented engineering’. The benefits have been far reaching, ranging from the detailing of tolerances to material constraints.     

Design Aid for Grass-Lined Channels

The Manning roughness factor varies with the hydraulic radius in grass-lined channels. The functional relationship between the roughness factor and the hydraulic radius is highly nonlinear. This necessitates a lengthy and tedious trial-and-error method to solve the Manning formula in the different stages of the traditional design procedures for grass-lined channels. Various charts are presented in this technical note that can be used in designing grass-lined channels without a need for trial-and-error. The charts were developed using predetermined solutions to the Manning formula. They are presented in terms of dimensionless parameters and can be employed with any consistent unit system. The use of the charts is demonstrated through an example.     

Supramolecular Immobilization of a Perfluoro‐Tagged Pd‐Catalyst with Dendritic Architectures and Application in Suzuki Reactions

A new supramolecular complex of a perfluoro‐tagged palladium phosphine catalyst to a dendritic core‐shell architecture with a perfluoroalkyl shell was used as recoverable catalyst for Suzuki couplings. This homogeneous complex can also serve as a model for related catalysts adsorbed on fluorous silica gel.