Microstructural Evolution, Hardness and Wear Resistance of WC-Co-Ni Composite Coatings Fabricated by Laser Cladding.

This study investigated how process parameters of laser cladding affect the microstructure and mechanical properties of WC-12Co composite coating for use as a protective layer of continuous caster rolls. WC-Co powders, WC-Ni powders, and Ni-Cr alloy powder with various wear resistance characteristics were evaluated in order to determine their applicability for use as cladding materials for continuous caster roll coating. The cladding process was conducted with various parameters, including laser powers, cladding speeds, and powder feeding rates, then the phases, microstructure, and micro-hardness of the cladding layer were analyzed in each specimen. Results indicate that, to increase the hardness of the cladding layer in WC-Co composite coating, the dilution of the cladding layer by dissolution of Fe from the substrate should be minimized, and the formation of the Fe-Co alloy phase should be prevented. The mechanical properties and wear resistance of each powder with the same process parameters were compared and analyzed. The microstructure and mechanical properties of the laser cladding layer depend not only on the process parameters, but also on the powder characteristics, such as WC particle size and the type of binder material. Additionally, depending on the degree of thermal decomposition of WC particles and evolution of W distribution within the cladding layer, the hardness of each powder can differ significantly, and the wear mechanism can change.

Investigating the Feasibility of Multisensory Environments to Improve the Assisted Bathing Experience for Veterans With Dementia: A Clinical Trial.

OBJECTIVES: This evidence-based design clinical trial assessed the feasibility of a multisensory environment (MSE) using aromatherapy, color-changing lights, and music as a behavioral intervention to calm Veterans with dementia during assisted bathing to improve the patient experience. BACKGROUND: The number of Veterans with dementia is growing rapidly, along with the associated debilitating behavior challenges. The severity of these distressed behaviors that predominantly occur at bath time often necessitates costly, dangerous sedatives. Feasibility studies of nonpharmacological behavioral interventions during bathing for people with dementia are urgently needed, and research supports MSE as a viable solution. METHOD: Using an A-B, multiple baselines across participants design, this study tracked operational behaviors of four Veterans with dementia during bathing without and with an MSE intervention. Sessions were provided and recorded by a dedicated team of five nurses, so the study team could analyze the Veterans' operational behaviors to understand the impact of individualized MSE during both baseline and intervention phases. RESULTS: The results support the feasibility of MSE as a helpful, nonpharmacological behavioral intervention for Veterans with dementia during bathing. All participants experienced an overall increase in duration of positive operational behaviors and an overall decrease in duration of negative operational behaviors. CONCLUSIONS: Healthcare environments are integral components in dementia care and the use of MSE within the bathing setting appears to improve not only operational behaviors but the overall bathing experience.

Evaluating the Impact of a Multisensory Environment on Target Behaviors of Children With Autism Spectrum Disorder.

BACKGROUND: Worldwide, children are increasingly being diagnosed with autism spectrum disorder (ASD). The case of South Korea is not exceptional. One of the core symptoms of children with ASD is sensory reactivity issues, such as an unusual interest in the sensory aspects of the environment. One promising development in sensory enrichment for individuals with ASD is a multisensory environment (MSE). OBJECTIVES: This study investigated the influence of MSE on the target behaviors of children with ASD with different sensory characteristics in the case of South Korea. METHODS: A multiple treatment design {A-B-C-D (B + C) phases} was implemented to observe the six target behaviors of three children with ASD. The sensory environmental intervention focusing on visual and auditory stimuli was manipulated as a stimulating MSE or a relaxing MSE depending on the sensory profile of each participant. The analysis was undertaken using visual inspection with data patterns and graph slopes, which is a customary method of analyzing the single-subject design data. In addition, the means and standard deviations of the two target behaviors of each participant were analyzed together. RESULTS: The findings reveal that MSE interventions positively affected the target behaviors of children with ASD with diverse sensory characteristics. The stimulating MSE created by the integration of visual and auditory stimuli was the most effective intervention for the participants with hypo-visual and hypo-auditory sensitivities in this study. CONCLUSIONS: The MSE could be meaningful as a nonpharmaceutical therapy that could influence the daily behaviors of children with ASD.

Testing of path-based visual cues on patterned carpet to assist older adults' gait in a continuing care retirement community.

Fall accidents lead to hospitalization and medical costs among all age groups, especially severe for older adults. Both intrinsic (e.g., visual impairment, fear of falling) and extrinsic (e.g., inappropriate carpet design, poor lighting) factors contribute to fall accidents. Older adults increasingly rely on visual perception to maintain balance as their health conditions decline. Patterned carpet is common in the built environment, which is one of the factors contributing to fall accidents among older adults. This study examined the role of path-based visual cues (provide visual guidance while walking along the patterned carpet) in helping older adults maintain safe movement and overcome the fear of falling. The experimental field study was conducted at a Continuing Care Retirement Community. Thirty-two residents were recruited. Within-subjects design was employed to examine the effects of path-based visual cues (light color and brightness) on the gait characteristics of older adults with and without visual impairment while walking on patterned carpet. Wearable sensors collected older adults' gait characteristics and questionnaires were used to evaluate their perceptions of confidence and safety with different visual cues provided. Individual repeated measures analysis results indicated that older adults significantly decreased stride length and stride velocity under 8.3 fc white and 7.3 fc blue lighting conditions compared to the baseline condition. In addition, the principal component analysis also indicated significant differences in gait performance among lighting colors and lighting brightness. The subjective responses indicated that the path-based visual cues were helpful in improving walking confidence, particularly for older adults with visual impairment.

Study on development of forensic blood substitute: Focusing on bloodstain pattern analysis.

Bloodstain pattern analysis, one of the areas of forensic science, is performed to analyze the physical characteristics of bloodstains, including their size, shape, and distribution, to reconstruct a crime scene. A bloodstain pattern analyst should obtain through experiments and education the capabilities to both understand the generation mechanisms of bloodstains and identify the characteristics of the bloodstains. Experiments and education about bloodstain pattern analysis are carried out by using human blood taken from subjects, animal blood (porcine or bovine) supplied from butcheries, and blood substitute products developed in other countries. However, these kinds of blood have many limitations in their application due to various problems. The blood substitute developed in the present study is more similar to human blood than other blood substitute products developed in other countries with regard to the physical properties, including viscosity, viscoelasticity, and surface tension, as well as the drip bloodstain patterns depending on the surface and coordinate characteristics of drip stains impact angle. The blood substitute developed in the present study is more practical, because the materials that are used in its preparation are readily available in the market and do not include chemicals that are harmful to the human body, and the blood substitute has luminol reaction functionality and pattern transfer bloodstain (bloodstain fingerprint, bloodstain footprint, etc.) dyeing functionality.

Sensory Environments for Behavioral Health in Dementia: Diffusion of an Environmental Innovation at the Veterans Health Administration.

OBJECTIVES: To evaluate the diffusion of multisensory environments (MSEs) as an innovation at the Veterans Health Administration (VHA) and gather feedback regarding staff perceptions of barriers to uptake and effectiveness of MSEs for Veterans with dementia. BACKGROUND: Responding to the need for nonpharmacological behavioral interventions, VHA funded the first MSE for Veterans with dementia in 2010. The room incorporated LED color-changing lights, bubble tubes, vibroacoustic furniture, music, and aromatherapy, and the success of this patient-centered sensory room fueled national rollouts in 2013 and 2015. METHOD: A qualitative interview approach was used. Thirty-two staff members participated from 12 of the 53 sites producing 21 individual interviews and 1 group interview with 11 participants. Results were analyzed by a team of eight researchers using the rapid qualitative inquiry method to identify common themes and major insights. RESULTS: Important insights emerged with regard to staff members' perceptions about the effectiveness of MSE therapy as well as barriers to uptake and suggested strategies for overcoming those barriers (e.g., empowering a champion, developing a clear maintenance plan). CONCLUSIONS: The findings from this research indicate MSEs are perceived as effective in improving behavior for Veterans with dementia and represent an innovation that has been well-diffused within the VHA, with great potential for future clinical applications.

Synthesis of 18F-Labeled Aryl Fluorosulfates via Nucleophilic Radiofluorination.

Sulfuryl fluoride gas is a key reagent for SO2F transfer. However, conventional SO2F transfer reactions have limited 18F-radiochemistry translation, due to the inaccessibility of gaseous [18F]SO2F2. Herein, we report the first SO2F2-free synthesis of aryl [18F]fluorosulfates from both phenolic and isolated aryl imidazylate precursors with cyclotron-produced 18F-. The radiochemical yields ranged from moderate to good with excellent functional group tolerance. The reliability of our approach was validated by the automated radiosynthesis of 4-acetamidophenyl [18F]fluorosulfate.

Redox-Active Functional Electrolyte for High-Performance Seawater Batteries.

Rechargeable seawater batteries have gained recognition as key sustainable electrochemical systems by employing the near-infinite and eco-friendly catholyte seawater. However, their practical applications have been limited owing to the low chemical and electrochemical stability of the anode component. Herein, a stability-secured approach was developed by using sodium-biphenyl-dimethoxyethane solution as a redox-active functional anolyte for high-performance seawater batteries. This anolyte system shows high electrochemical stability, superior cycle performance, and cost-effectiveness over conventional electrolyte systems.

Application of 3D Laser Scanner to Forensic Engineering.

In the case of building collapses and overturned structures, a three-dimensional (3D) collapse or overturn model is required to reconstruct the accident. As construction sites become increasingly complex and large, 3D laser scanning is sometimes the best tool to accurately document and store the site conditions. This case report presents one case of a structure collapse and one case of an overturned crane reconstructed by a 3D laser scanner. In the case of structural collapse of a prefabricated shoring system, a 3D model reconstructed all the members successfully, a task that is nearly impossible using a scale such as a tape measure. The reconstructed prefabricated shoring system was verified through a structural analysis through comparison with the construction drawings to investigate faults in construction. In the case of the overturned crane, the jib angle and other major dimensions were successfully acquired through 3D laser scanning and used to estimate the working radius. As a result, the propriety of the working radius with the given lifting load was successfully determined.

A Ferris Wheel Accident at a Movable Amusement Park.

This study presented a Ferris wheel accident case. A Ferris wheel is composed of many parts, and the outmost ring of it is assembled using a lock pin. This accident occurred because the lock pin caught the door of a gondola and the gondola overturned. Five of the seven passengers in the gondola fell to the ground, along with the gondola's viewing window. The investigation revealed that the gondola became stuck when its door was caught by a lock pin at the Ferris wheel's three o'clock position. The contact between the door and the lock pin was due to a structural problem: There was not enough space allotted between the door and the lock pin. Therefore, if a passenger pushed on the gondola's door, the potential existed for contact between the door and the lock pin.

Isolation and identification of phlorotannins from Ecklonia stolonifera with antioxidant and anti-inflammatory properties.

Bioactivity-guided fractionation of Ecklonia stolonifera was used to determine the chemical identity of bioactive constituents, with potent antioxidant activities. The structures of the phlorotannins were determined on the basis of spectroscopic analysis, including NMR and mass spectrometry analysis. The antioxidant activities of the isolated compounds were evaluated by free radical scavenging activities in both in vitro and cellular systems. The anti-inflammatory effects of the isolated compounds were evaluated by determining their inhibitory effects on the production of nitric oxide (NO) and prostaglandin E(2) (PGE(2)) in lipopolysaccharide (LPS)-induced RAW 264.7 murine macrophage cells. The results indicated that phlorofucofuroeckol A, dieckol, and dioxinodehydroeckol showed potential radical scavenging activities against 2,2-diphenyl-1-picrylhydrazyl. Among them, phlorofucofuroeckol A and dieckol significantly suppressed the intracellular reactive oxygen species level assayed by 2',7'-dichlorofluorescein diacetate assay in LPS-induced RAW 264.7 cells. Phlorofucofuroeckol A significantly inhibited the LPS-induced production of NO and PGE(2) through the down-regulation of inducible nitric oxide synthase and cyclooxygenase 2 protein expressions. In conclusion, these results suggest that phlorofucofuroeckol A has a potential for functional foods with antioxidant and anti-inflammatory activities.