A substantially visibly transparent topical physical sunscreen formulation

A topically applied sunscreen composition is provided, which by use of nano-sized particles of a physical UV screening agent in a dermatologically acceptable carrier, provides a dermatologically acceptable level of SPF and broad-spectrum protection from UVA and UVB radiation without the need to include chemical UV screening agents in the composition.

Micro-porous nickel produced by powder metallurgy

Micro-porous nickel (Ni) with an open cell structure was fabricated by a special powder metallurgical process, which includes the adding of a space-holding material. The average pore size of the micro-porous Ni samples approximated 30 μm and 150 μm, and the porosity ranged from 60 % to 80 %. The porous characteristics of the Ni samples were observed using scanning electron microscopy (SEM) and the mechanical properties were evaluated using compressive tests. For comparison, porous Ni samples with a macro-porous structure prepared by both powder metallurgy
(pore size 800 μm) and the traditional chemical vapour deposition (CVD) method (pore size 1300 μm) were also presented. Results indicated that the porous Ni samples with a micro-porous structure exhibited different deformation behaviour and dramatically increased mechanical properties,
compared to those of the macro-porous Ni samples.

Characterization of superfine wool powder/poly(propylene) blend film

Superfine wool powder was blended and extruded with poly(propylene) (PP) to produce blend pellets, and the extruded pellets were hot-pressed into a blend film. SEM photographs show that the powder could be uniformly incorporated with PP after extrusion. FT-IR spectra shows that no substantial changes occurred in the chemical structure of both PP and wool powder in the blend film. X-Ray diffraction analysis indicates that crystallinity of the blend film was much higher than that of the wool powder and little lower than that of PP. TG-tested results indicate that the thermal stability of the blend film declined with an increase in the powder content. Endothermic peaks of the wool powder in the blend film become more obvious as the powder content increases. Mechanical properties decline greatly with an increase in the wool powder content in the blend film.

Aluminium powder forging process using a rotating platen

A torsional upset forging process is analysed on the basis of plasticity theory for powder metal forging. Torsional upset forging is a process to be performed by rotating a lower die with a punch travelling along the longitudinal direction of a work-piece. In this study, an upper bound analysis considering bulging effect, finite element method simulation (DEFORM3D), and experimental research have been performed for the process. A simple kinematically admissible velocity field for a three dimensional deformation is presented for the torsional upset forging of a cylindrical billet. Distributions of stress, strain, and forging load in the process have been obtained, and compared with those in conventional upset forging. In the process, an increase in a friction factor and rotation speed results in a decrease in magnitude of upset force, dead metal zone, and non-homogeneous deformation. This process can reduce forming load, which leads to improvement of die life, and also reduce bulging effect. In addition, the initial sintered-structure and density distribution is improved by the process and surface defect due to high deformation is decreased.

Synthesis of Ti–Sn–Nb alloy by powder metallurgy

The microstructural evolution and characteristics of the Ti–16Sn–4Nb powder particles and bulk alloys sintered from the powders ball-milled for various periods of time were studied. Results indicated that ball milling to 8 h led to the development of a supersaturated hcp α-Ti and partial amorphous phase due to the solid solution of Sn and Nb into Ti lattice. The bulk Ti–16Sn–4Nb alloy made from the powders ball milled for a short time, up to 2 h, exhibited a primary α and a Widmanstätten structure consisting of interlaced secondary α and β. With an increase in ball milling time up to 10 h, the microstructure evolved into a fine β phase dispersed homogeneously within α phase matrix. The microhardness values of the bulk alloy in both α- and β-phases increased with the increasing of the ball milling time and reached a plateau value at 8 h and longer, i.e. 687 and 550 HV for α- and β-phases, respectively. Likewise, the microhardness of the α phases was always higher than that of the β phases in the bulk alloys made from the powders ball milled for the same milling time.

Characterization of hot-pressed films from superfine wool powder

In this study, superfine wool powder was plasticized with glycerol and hot-pressed into a film. Scanning electron microscopy photos showed that the superfine wool powder could be molded into a smooth film and that the wool powder was distributed evenly in the cross section of the film. Fourier transform infrared analysis revealed no substantial changes in the chemical structure of the wool powder after hot pressing, but the absorbing peaks of glycerol were found in the spectrum. X-ray diffraction analysis showed that the overall crystallinity increased after the wool powder was hot-pressed into film. Thermogravimetry (TG) analysis indicated that the thermal stability of the hot-pressed film decreased. A transition point appeared in the TG curve of the wool hot-pressed film as glycerol was added. The differential thermal analysis curve of the film showed sharp absorbing peaks similar to that of wool powder. With increasing glycerol content, the film showed increasing ductility and softness.

Bleaching and dyeing of superfine wool powder/polypropylene blend film

Fibers based regenerated protein draw much attention for recycling discarded protein resources and can produce biodegradable and environmental friendly polymers. In this study, superfine wool powder is blended with polypropylene (PP) to produce wool powder/PP blend film through extrusion and hot-pressing. Hydrogen peroxide is used to bleach the black colored surface of the blend films. The effects of peroxide concentration, bleaching time and powder content on the final whiteness and mechanical properties of the blend films are investigated.

The bleached films are dyed with acid red dyes and the dyed color is evaluated using a Computer Color Matching System. Color characters of dyed films, such as L*, a*, b*, ΔE*ab, C*ab and K/S values are measured and analyzed. The study not only reuses discarded wool resources into organic powder, widens the application of superfine wool powder on polymers, but also improves the dyeing properties of PP through the addition of protein content.

Case formulation with sex offenders : an illustration of individualized risk assessment

There has been a rapid expansion of the professional literature in risk assessment with sexual offenders over the past 20 years.  However, recent professional experience suggests that risk assessment reports often fail to be as relevant or useful as they might be for judicial decision-makers.  Research with large samples of offenders has refined our understanding of identifiable subgroups with different rates of sexual reoffending, but the management of risk requires that we deal effectively with individual offenders.  One area that can be improved is the development of case formulations of risk.  Clinicians must move beyond the mechanical use of actuarial static and dynamic risk factors to a broader integration of relevant information about the individual if they are to assist in managing risk in a way that serves the needs of the offender while protecting public safety.

Talking it up! Project report : Aboriginal voices in the formulation of health policy that works : short report

Initially, there were three separate strands to the work of the project: a series of forums involving group interviews/discussions with community members; a policy analysis that reviewed policies relating to Aboriginal health at federal and state level; and a literature review. The results of these three separate strands of analysis were then brought together in a fourth strand to the work, a process involving community members to discuss and agree the overall recommendations contained in this report.

Through this structure, the project employed a participatory methodology as the basis for individual and collective empowerment in relation to health outcomes. As mentioned above, the need for the project was identified by Aboriginal people, through their own processes of healing. The need was presented by appropriate figures within their communities, namely community elders. They invited other Aboriginal people to take part through their own communication channels, thus ensuring that responsibility for engagement in the project, and in formulating action for improvement, remained with Aboriginal people and their families. However, the project design also recognised that Aboriginal people exist within broader structural and policy constraints which impact on their ability to manage their own lives successfully or otherwise. Thus the project sought to combine indigenous and non-indigenous knowledge through bringing together the three strands of work in the way described.

A Community Reference Group guided the work of the project at all stages, endorsed the findings and drafted the recommendations. The two elders who had identified the need for the project formed the core of the group, and worked on the project from start to finish. At different times during the project, other community members joined the group to assist in its work, including training Aboriginal researchers, letting others know about the forums, discussing findings and drafting recommendations.

Talking it up! Project report : Aboriginal voices in the formulation of health policy that works : full report

Initially, there were three separate strands to the work of the project: a series of forums involving group interviews/discussions with community members; a policy analysis that reviewed policies relating to Aboriginal health at federal and state level; and a literature review. The results of these three separate strands of analysis were then brought together in a fourth strand to the work, a process involving community members to discuss and agree the overall recommendations contained in this report.

Through this structure, the project employed a participatory methodology as the basis for individual and collective empowerment in relation to health outcomes. As mentioned above, the need for the project was identified by Aboriginal people, through their own processes of healing. The need was presented by appropriate figures within their communities, namely community elders. They invited other Aboriginal people to take part through their own communication channels, thus ensuring that responsibility for engagement in the project, and in formulating action for improvement, remained with Aboriginal people and their families. However, the project design also recognised that Aboriginal people exist within broader structural and policy constraints which impact on their ability to manage their own lives successfully or otherwise. Thus the project sought to combine indigenous and non-indigenous knowledge through bringing together the three strands of work in the way described.

A Community Reference Group guided the work of the project at all stages, endorsed the findings and drafted the recommendations. The two elders who had identified the need for the project formed the core of the group, and worked on the project from start to finish. At different times during the project, other community members joined the group to assist in its work, including training Aboriginal researchers, letting others know about the forums, discussing findings and drafting recommendations.
Initially, there were three separate strands to the work of the project: a series of forums involving group interviews/discussions with community members; a policy analysis that reviewed policies relating to Aboriginal health at federal and state level; and a literature review. The results of these three separate strands of analysis were then brought together in a fourth strand to the work, a process involving community members to discuss and agree the overall recommendations contained in this report.

Through this structure, the project employed a participatory methodology as the basis for individual and collective empowerment in relation to health outcomes. As mentioned above, the need for the project was identified by Aboriginal people, through their own processes of healing. The need was presented by appropriate figures within their communities, namely community elders. They invited other Aboriginal people to take part through their own communication channels, thus ensuring that responsibility for engagement in the project, and in formulating action for improvement, remained with Aboriginal people and their families. However, the project design also recognised that Aboriginal people exist within broader structural and policy constraints which impact on their ability to manage their own lives successfully or otherwise. Thus the project sought to combine indigenous and non-indigenous knowledge through bringing together the three strands of work in the way described.

The effect of hydrogenation on the ECAP compaction of Ti–6Al–4V powder and the mechanical properties of compacts

The effect of hydrogen content on the compaction of Ti–6Al–4V powder at low temperatures, namely 500 °C, using equal channel angular pressing (ECAP) with back pressure has been investigated. The properties of the compacts before and after a heat treatment and de-hydrogenation cycle have been determined. Compaction of powder by ECAP (500 °C and 260 MPa) has shown maximum levels of relative density of 99.3% and 99.4% when charged with 0.05–0.1 wt.% and 0.61–0.85 wt.% of hydrogen, respectively. After the de-hydrogenation heat treatment the diffusion bonding between individual powder particles was completed and the microstructure was altered, depending on the level of hydrogen content. Two local maxima of 99.2% and 98.1% were observed in the measured density of consolidated compacts for hydrogen contents between 0.05 wt.% and 0.1 wt.% and between 0.61 wt.% and 0.85 wt.%, respectively. However, the mechanical properties of the compacts within these two ranges of hydrogen content were significantly different due to a difference in the observed microstructure. An exceptionally high ductility of 29%, in combination with a relatively high strength of ~560 MPa, was measured in a shear punch test on specimens which had a prior hydrogen level of 0.05 wt.% before the heat treatment. It was shown that material consolidated from powder hydrogenated to low levels of hydrogen before compaction has the potential to offer substantial improvements in mechanical properties after a suitable heat treatment.

Fabrication of ultrafine powder from eri silk through attritor and jet milling

Fibroin protein derived from silk fibres has been extensively studied with exciting outcomes for a number of potential advanced biomaterial applications. However, one of the major challenges in applications lies in engineering fibroin into a  desired form using a convenient production technology. In this paper, fabrication of ultrafine powder from eri silk is reported. The silk cocoons were degummed and the extracted silk fibres were then chopped into snippets prior to attritor and air jet milling. Effects of process control agents, material load and material to water ratio during attritor milling were studied. Compared to dry and dry–wet attritor milling, wet process emerged as the preferred option as it caused less colour change and facilitated easy handling. Ultrafine silk powder with a volume based particle size d(0.5) of around 700 nm could be prepared following the sequence of chopping ➔ wet attritor milling ➔ spray drying ➔ air jet milling. Unlike most reported powder production methods, this method could fabricate silk particles in a short time without any pre-treatment on degummed fibre. Moreover, the size range obtained is much smaller than that previously produced using standard milling devices. Reduction in fibre tenacity either shortened the milling time even further or helped bypassing media milling to produce fine powder directly through jet milling. However, such reduction in fibre strength did not help in increasing the ultimate particle fineness. The study also revealed that particle density and particle morphology could be manipulated through appropriate changes in the degumming process.

Graphical Abstract:  Fabrication of eri silk powder using attritor and jet milling is reported. Volume based particle size d(0.5) of around 700 nm could be prepared following the sequence chopping ➔ wet attritor milling ➔ spray drying ➔ air jet milling. No pre-treatments were used and the particle size range obtained is much smaller than that previously produced using standard milling devices. Particle density morphology could be manipulated through appropriate changes of cocoon degumming conditions.