The balance of planting and mortality in a street tree population

Street trees have aesthetic, environmental, human health, and economic benefits in urban ecosystems. Street tree populations are constructed by cycles of planting, growth, death, removal and replacement. The goals of this study were to understand how tree mortality and planting rates affect net population growth, evaluate the shape of the mortality curve, and assess selected risk factors for survival. We monitored a street tree population in West Oakland, CA for 5 years after an initial inventory (2006). We adapted the classic demographic balancing equation to quantify annual inputs and outputs to the system, tracking pools of live and standing dead trees. There was a 17.2 % net increase in live tree counts during the study period (995 in 2006, 1166 in 2011), with population growth observed each year. Of the live trees in 2006, 822 survived to 2011, for an annual mortality rate of 3.7 %. However, population growth was constrained by high mortality of young/small trees. Annual mortality was highest for small trees, and lower for mid-size and large trees; this represents a Type III mortality curve. We used multivariate logistic regression to evaluate the relationship between 2011 survival outcomes and inventory data from 2006. In the final model, significant associations were found for size class, foliage condition, planting location, and a multiplicative interaction term for size and foliage condition. Street tree populations are complex cultivated systems whose dynamics can be understood by a combination of longitudinal data and demographic analysis. Urban forest monitoring is important to understand the impact of tree planting programs.     

Risk of Large‐Scale Evacuation Based on the Effectiveness of Rescue Strategies Under Different Crowd Densities

Crowd density is a key factor that influences the moving characteristics of a large group of people during a large‐scale evacuation. In this article, the macro features of crowd flow and subsequent rescue strategies were considered, and a series of characteristic crowd densities that affect large‐scale people movement, as well as the maximum bearing density when the crowd is extremely congested, were analyzed. On the basis of characteristic crowd densities, the queuing theory was applied to simulate crowd movement. Accordingly, the moving characteristics of the crowd and the effects of typical crowd density—which is viewed as the representation of the crowd's arrival intensity in front of the evacuation passageways—on rescue strategies was studied. Furthermore, a “risk axle of crowd density” is proposed to determine the efficiency of rescue strategies in a large‐scale evacuation, i.e., whether the rescue strategies are able to effectively maintain or improve evacuation efficiency. Finally, through some rational hypotheses for the value of evacuation risk, a three‐dimensional distribution of the evacuation risk is established to illustrate the risk axle of crowd density. This work aims to make some macro, but original, analysis on the risk of large‐scale crowd evacuation from the perspective of the efficiency of rescue strategies.     

The influence of perception of school principal’s leadership on teachers’ job satisfaction in the interior of Sabah,Malaysia: a case study in Beaufort

This study investigates the relationship between teachers’ perceptions of the school principal’s leadership and their job satisfaction in Beaufort, a multiethnic semirural area in the interior of Sabah, Malaysia. Results of the research showed that there is a significant positive relationship between the perceived leadership of the school principal and job satisfaction among the teaching staff, and the relationship is not influenced by the demographic attributes of the study participants. The results accentuate the importance of developing the leadership of principals in public schools to enhance the commitment and job satisfaction of the teaching staff, which indirectly affects the overall performance of schools and students.     

A concise genealogy and anatomy of habitus

Retracing the philosophical origins and initial usage of habitus by Bourdieu to account for the historical disjuncture wrought by the Algerian war of national liberation and the postwar modernization of the French countryside allows us to clear up four recurrent misunderstandings about the concept: (1) habitus is never the replica of a single social structure but a dynamic, multiscalar, and multilayered set of schemata subject to ‘permanent revision’ in practice; (2) habitus is not necessarily coherent and unified but displays varying degrees of integration and tension; (3) because it is not always congruent with the cosmos in which it evolves, habitus is suited to analysing crisis and change no less than cohesion and perpetuation; but (4) it is not a self‐sufficient mechanism for the generation of action: the dissection of dispositions must always proceed in close connection with the mapping of the system of positions that alternately excite, suppress, or redirect the socially constituted capacities and inclinations of the agent. Crucially, in Bourdieu's hands, habitus is not an abstract concept issued from and aimed at theoretical disquisition, but a stenographic manner of designating a research posture that puts the genetic mode of thinking at the heart of social analysis.     

Stuck inside the federal-Indian funding relationship: a tale of two evaluations

Two case studies are presented to compare and contrast the challenges encountered when attempting to conduct participatory evaluations (P-Es) with tribal programs that represented two extremes of collaboration between the programs and evaluators. In one case, the P-E was successful because the principals were invested in the program, whereas in the second case, the absence of a shared program vision hampered the ability to adequately evaluate the program. The authors contend that governmental funding agencies have responsibilities to ensure that their expectations are appropriate, the proposed program is feasible, and that technical assistance should be provided before the grant is written, not after it has been funded.     

Human resource development,organization development,organizational learning,and organizational effectiveness: all needed more than ever

In this study the Job Demand-Control model was used to study the quality of working life of Dutch secondary teachers. The Job Demand-Control model of Karasek is a theoretical model in which stress and learning are both considered as dependent variables which are influenced by three different task characteristics: job demands, job control, and social support. This model was tested for Dutch secondary teachers (n = 542). Results shed light on the relationship between stress and learning, on the one hand, and the effects of task characteristics on work stress and on work-based learning, on the other hand. It is concluded that the relationship between stress and learning is mediated by the amount of job control as the model predicts. However, the results also reveal that the Karasek model is better suited for explaining stress than for explaining learning. To explain work-based learning variables other than task characteristics have to be taken into account.     

易道和医道——试论《周易》时机观对中医理论的影响

本文从时机观的角度探讨了《周易》哲学对中医理论的影响,认为中医学中的审时知机、按时针刺的针刺理论,子午流注、灵龟八法、飞腾八法等时间针法以及冬病夏治、三伏天灸和冬令进补、三九膏方等方法都是在《周易》时机观的影响下所建构的。《周易》哲学中审时度势、知时知机、因时变通的时机观实际上也是传统中医认识人体生理功能、病理变化和制定治疗法则的理论依据。