Influence of non-hydrolysable groups in silane precursor on pore dimension and photochromic properties of sol-gel silica embedded with a spirooxazine dye

In this work, silica embedded with a spirooxazine dye was prepared by hydrolysis of silanes that bear a nonhydrolyzable group of different structures through a sol-gel route in the presence of a spirooxazine dye, and the pore dimension and photochromic properties of photochromic silica coatings on fabric were studied. The pore dimension in the silica was examined by small angle X-ray scattering (SAXS), transmission electron microscopy (TEM), and nitrogen adsorption porosimetry. The SAXS results revealed that the distance between pores was in the range between 0.8 nm and 1.9 nm and it increased with increasing the size of the non-hydrolyzable group. Pore size measured by nitrogen adsorption porosimetry was in the range of 2.1-2.7 nm. The photochromic optical absorption was influenced mainly by the hydrophobicity of the non-hydrolyzable groups, while the color changing rates were influenced by the steric effect of the non-hydrolyzable groups and their interaction with the dye.

Compressibility of porous magnesium foam: dependency on porosity and pore size

Mechanical properties of porous magnesium with the porosity of 35–55% and the pore size of about 70–400 μm are investigated by compressive tests focusing on the effects of the porosity and pore size on the Young's modulus and strength. Results indicated that the Young's modulus and peak stress increase with decreasing porosity and pore size. The mechanical properties of the porous magnesium were in a range of those of cancellous bone. Therefore, it is suggested that the porous magnesium is one of promising scaffold materials for hard tissue regeneration.

An image retrieval system based on fractal dimension

This paper presents a new kind of image retrieval system which obtains the feature vectors of images by estimating their fractal dimension; and at the same time establishes a tree-structure image database. After preprocessing and feature extracting, a given image is matched with the standard images in the image database using a hierarchical method of image indexing.

Developing a framework for understanding the emotional dimension of organizational culture

Why is it that in some organizations we are able to find and develop our positive selves and in others we are not? Responding to the call from positive organizational scholarship to better understand how to build contexts for human flourishing, in this paper we are concerned how an organization's culture contributes to our thriving, or failing to thrive, at work. We introduce the organizational culture construct and its summary dimensions, noting the absence of an emotional dimension. We show that it is through our interactions with others that organizational culture is developed and maintained, and through which we learn how to manage and interpret the emotions we experience. That is, relationships are central to both culture and emotions. Integrating Josselson's model of our relational needs with Schein's typology of organizational culture, we present a relationally-based framework for an emotional dimension of organizational culture. The paper concludes with a report on a study designed to refine the framework presented and suggests that individuals will thrive in organizations where the cultural norms and values for relating enable a "good enough" fulfillment of our relational needs.

The development of a new construct : the emotional dimension of organizational culture

Qualitative organisational culture studies reveal the emotional side of organisational life. Yet, in a recent review of the quantitative organisational culture survey measures available, 10 summary dimensions were identified intended to be representative of the major dimensional categories in the organisational culture literature, and an emotional dimension was notably absent. The PhD aims to address this gap in the literature by (a) developing a theoretical definition of the newly proposed dimension; and (b) developing and validating an instrument for its measurement. The talk presents the findings of the studies conducted to date and discusses the inherent challenges of bringing the rigours of psychometric development to areas more commonly associated with qualitative research. The theoretical bases for adopting a multidimensional, relational approach that draws on theories within the psychoanalytically oriented and feminist traditions is provided. A strength of this approach is that the research can potentially contribute to explaining the nature of the ties between organisational members that is currently lacking in organisational research.

Applications of electrospun nanofibers

Polymeric nanofiber non-woven materials produced by electrospinning have extremely high surface-to-mass (or volume) ratio and a porous structure with excellent pore-interconnectivity. These characteristics plus the functionalities and surface chemistry of the polymer itself impart the nanofibers with desirable properties for a range of advanced applications. This review summarizes the recent progress in electrospun nanofibers, with an emphasis on their applications.

Effects of pore morphology on the compressive behaviour of porous metals

In the present study, porous nickel foams with three different porosities (i.e. 50 %, 60 % and 70 %) were fabricated using the space-holding sintering method. Ammonium bicarbonate particles with sizes ranging from 1- 2 mm were chosen as the space-holding material. The anisotropic behaviours of the nickel foam samples were investigated by compressive testing loading at different directions, i.e., in both directions of the major and minor axis of ellipsoidal cells. Electron scanning microscopy (SEM) and Image-Pro Plus was used to characterise the morphological characteristics of the porous nickel foam samples. Results indicated that the porous nickel foam samples exhibited obvious anisotropic mechanical properties. The foam sample shows significantly higher nominal stress for loading in the direction of the major axis of the pores than loading in the direction of the minor axis of pores. The nominal stress increases with the decreasing of the porosity.

Australian businesses in China : the political dimension

This paper develops a model about the political factors Australian businesses should consider when entering China, and then empirically examines the issues by interviewing representatives .fi'om 40 companies who have operations in China. The political dimension in this paper comprises the political system, political barriers and risk, relationships with government, Australian government assistance, and Chinese government assistance. We then looked at whether these components of politics influenced entry modes, as stated by our interviewees. We found that political barriers effected entry mode choice, while the remainder of components of politics influenced business implementation and operation.