Family recovery from youth substance use related problems : a pilot study of the BEST plus program

Youth substance use related problems are increasingly common, and families experience considerable stress in attempting to cope with these problems. A pilot study of 34 Australian parents from 21 families (38% sole parent families) participating in an 8-week group program, designed to assist families recover from youth substance use related problems, provided the context to explore family change processes. Participants reported a number of significant improvements over the course of the four groups that ran from late 2003 and through 2004. Regression analyses found general support for the program logic model in identifying significant associations between program-targeted parent changes and post-program improvements in stress symptoms and cohesive family behaviors. The study's limitations are noted.

Service recovery in a service guarantee context

This study employed a 2 x 2 full-factorial, between-subjects design experiment examining the influence of service failure severity and fix on hotel guests’ satisfaction following invocation of a service guarantee. The study involved a sample of 130 online panel members. As expected, guests are less dissatisfied following a minor (versus a major) service failure while satisfaction is enhanced when the problem is corrected. Surprisingly, fix has a stronger influence on satisfaction when a severe failure occurs, and satisfaction evaluations are approximately equal regardless of the severity of the failure when the problem is fixed.

Transparent and autonomic rollback-recovery in cluster systems

Cluster systems provide an excellent environment to run computation hungry applications. However, due to being created using commodity components they are prone to failures. To overcome these failures we propose to use rollback-recovery, which consists of the checkpointing and recovery facilities. Checkpointing facilities have been the focus of many previous studies; however, the recovery facilities have been overlooked. This paper focuses on the requirements, concept and architecture of recovery facilities. The synthesized fault tolerant system was implemented in the GENESIS system and evaluated. The results show that the synthesized system is efficient and scalable.

The influence of guarantee compensation and fix on service recovery

This study employed a 3 x 2 full-factorial, between-subjects design experiment examining the influence of service guarantee compensation and fix on hotel guests’ satisfaction following invocation of a service guarantee. The study involved a sample of 390 online panel members. As expected, satisfaction is enhanced when the problem is corrected, however overcompensating guests beyond what was initially promised does not enhance satisfaction evaluations. Increasing compensation from the low to the medium (promised) level results in stronger satisfaction ratings when the problem is fixed versus when it is not.

Skeletal muscle fat metabolism during post-exercise recovery in humans

Recovery after prolonged or high-intensity exercise is characterised by a substantial increase in adipose tissue lipolysis, resulting in elevated rates of plasma-derived fat oxidation. Despite the large increase in circulating fatty acids (FAs) after exercise, only a small fraction of this is taken up by exercised muscle in the lower extremities. Indeed, the predominant fate of non-oxidised FAs derived from post-exercise lipolysis is reesteriflcation hi the liver. During recovery from endurance exercise, a number of changes also occur hi skeletal muscle that allow for a high metabolic priority towards glycogen resynthesis. Reducing muscle glycogen during exercise potentiates these effects, however the cellular and molecular mechanisms regulating substrate oxidation following exercise remain poorly defined. The broad arm of this thesis was to examine the regulation of fat metabolism during recovery from glycogen-lowering exercise hi the presence of altered fat and glucose availability. In study I, eight endurance-trained males completed a bout of exhaustive exercise followed by ingestion of carbohydrate (CHO)-rich meals (64-70% of energy from CHO) at 1, 4, and 7 h of recovery. Duplicate muscle biopsies were obtained at exhaustion and 3, 6 and 18 h of recovery. Despite the large intake of CHO during recovery (491 ± 28 g or 6.8 + 0.3 g • kg-1), respiratory exchange ratio values of 0.77 to 0.84 indicated a greater reliance on fat as an oxidative fuel. Intramuscular triacylglycerol (IMTG) content remained unchanged in the presence of elevated glucose and insulin levels during recovery , suggesting IMTG has a negligible role in contributing to the enhanced fat oxidation after exhaustive exercise. It appears that the partitioning of exogenous glucose towards glycogen resynthesis is of high metabolic priority during immediate post-exercise recovery, supported by the trend towards reduced pyruvate dehydrogenase (PDH) activity and increased fat oxidation. The effect of altering plasma FA availability during post-exercise recovery was examined in study II. Eight endurance-trained males performed three trials consisting of glycogen-lowering exercise, followed by infusion of either saline (CON), saline + nicotinic acid (NA) (LFA) or Intralipid and heparin (HFA). Muscle biopsies were obtained at the end of exercise (0 h) and at 3 and 6 h in recovery. Altering the availability of plasma FAs during recovery induced changes in whole-body fat oxidation that were unrelated to differences in skeletal muscle malonyl-CoA. Furthermore, fat oxidation and acetyl-CoA carboxylase (ACC) phosphorylation appear to be dissociated after exercise, suggesting mechanisms other than phosphorylation-mediated changes in ACC activity have an important role in regulating malonyl-CoA and fat metabolism in human skeletal muscle after exercise. Alternative mechanisms include citrate and long-chain fatty acyl-CoA mediated changes in ACC activity, or differences in malonyl-CoA decarboxylase (MCD) activity. Reducing plasma FA concentrations with NA attenuated the post-exercise increase in MCD and pyruvate dehydrogenase kinase 4 (PDK4) gene expression, suggesting that FAs and/or other factors induced by NA are involved hi the regulation of these genes. Despite marked changes hi plasma FA availability, no significant changes in IMTG concentration were detected, providing further evidence that plasma-derived FAs are the preferential fuel source contributing to the enhanced fat oxidation post-exercise during recovery. To further examine the effect of substrate availability after exercise, Study III investigated the regulation of fat metabolism during a 6 h recovery period with or without glucose infusion. Enhanced glucose availability significantly increased CHO oxidation compared with the fasted state, although no differences in whole-body fat oxidation were apparent. Consistent with the similar rates of fat metabolism, no difference hi AMPK or ACCβ phosphorylation were observed between trials. In addition, no significant treatment or time effects for IMTG concentration were detected during recovery. The large exercise-induced PDK4 gene expression was attenuated when plasma FAs were reduced during glucose infusion, supporting the hypothesis that PDK4 is responsive to sustained changes in lipid availability and/or changes in plasma insulin. Furthermore, the possibility exists that the suppression of PDK4 mRNA also reduced PDK activity and thus maintained PDH activity to account for the higher rates of CHO oxidation observed during glucose infusion compared with the control trial.

Active recovery, training status, muscle metabolism and repeated sprint performance

This thesis found that light exercise between repeated sprints improved performance in a subsequent bout. This was attributed to a reduction in potentially fatiguing by-products within the muscle and an increased aerobic metabolism in the second sprint.

Recovery of estuaries following disturbance by pollutants

The recovery of a heavily polluted estuary was assessed by comparing the structure of its intertidal community with six other estuaries. Results indicated that some recovery had occurred, however improvements in the study methodology were required to further clarify the ecological status of the creek.

Repeated sprint ability, recovery time and aerobic fitness

Aims to ascertain whether a relationship exists between repeated sprint ability (RSA) and aerobic fitness. RSA was assessed by 3 repeated sprint sessions departing avery 15, 30, or 60 seconds. Peak oxygen uptake and running velocity at VO2peak assessed aerobic fitness. When recovery time was increased between sprints, running velocity was better maintained, repeated sprint time was faster and the decrement in running velocity was smaller. Higher Vmax scores appear related to improved RSA as measured by the better maintainance of sprinting velocity.

Influence of processing on the roll forming characteristics of recovery annealed steel

Roll forming (including corrugating) of high strength steel has for many years been treated as an art rather than a science. This work, by using analysis at both the microscopic and standard mechanical level, has demystified the production of these high strength steels, and has helped point the direction for further development of these efficient construction products.

Integrated system for high quality water recovery and wastewater treatment

This thesis unveils an integrated system that once applied, could standardise and simplify the processes used for high quality water recovery and wastewater treatment. It forsees lower prices of desalinated and recovered water, in a streamlined and more efficient water industry, by departing from today's thinking of conventional wastewater treatment.

The study into fault tolerance based on rollback-recovery for clusters

The provision of fault tolerance is an important aspect to the success of distributed and cluster computing. Through this research , a transparent, autonomic and efficient fault tolerant facility was designed and implemented; thereby relieving the burden of a user having to handle and react to the failure of an application.

Justice-based service recovery in a service guarantee context

Although many service organisations have committed resources to developing service guarantee programmes, empirical research assessing their influence of consumers' post purchase evaluations is limited. This thesis addresses this deficiency in the guarantee literature by adapting and extending an established model of perceived justice and consumer satisfactionto the service guarantee context.

Fast recovery from node compromise in wireless sensor networks

Wireless Sensor Networks (WSNs) are susceptible to a wide range of security attacks in hostile environments due to the limited processing and energy capabilities of sensor nodes. Consequently, the use of WSNs in mission critical applications requires reliable detection and fast recovery from these attacks. While much research has been devoted to detecting security attacks, very little attention has been paid yet to the recovery task. In this paper, we present a novel mechanism that is based on dynamic network reclustering and node reprogramming for recovering from node compromise. In response to node compromise, the proposed recovery approach reclusters the network excluding compromised nodes; thus allowing normal network operation while initiating node recovery procedures. We propose a novel reclustering algorithm that uses 2-hop neighbourhood information for this purpose. For node reprogramming we propose the modified Deluge protocol. The proposed node recovery mechanism is both decentralized and scalable. Moreover, we demonstrate through its implementation on a TelosB-based sensor network testbed that the proposed recovery method performs well in a low-resource WSN.