- Research Article
2
- 10.1007/s42864-025-00329-w
Laser powder bed fusion of WC-Ni cermets: microstructural, phase and mechanical studies
- May 26, 2025
- Tungsten
- Shalini Singh + 5 more +5
Publications from 2021 to 2026
Showing 10 of 79 papers
Laser powder bed fusion of WC-Ni cermets: microstructural, phase and mechanical studies
A Rossian Method for Applying Principles in AI
In the past several years there has been a rapid development of new technologies, applications, organizations, and institutions in the area of artificial intelligence (AI). At the same time, ethical reasoning about AI has not been able to keep up with the speed of these advances. As a result, developers are left to rely on existing rules, professional codes, policies and personal ethics which may not provide the appropriate guidance about ethical conduct and may require greater specificity (O'Leary). Many commentators have acknowledged the need for a clearer understanding of ethical values and principles to guide AI research. Drawing on insights from the formation of the field of biomedical ethics, we argue that AI ethics should make use of the method based on prima facie duties derived from W.D. Ross’ approach to ethics. A Rossian approach has proved influential in biomedical ethics. We further propose a modification to the list of principles proposed by Floridi and Cowls, arguing that the principles of explicability and accountability should be separated for ease of application. We argue that this method of applying principles is just what has been missing in AI ethics and is the crucial link between the now common lists of principles and putting them into practice in a way that can inform actual developments on the ground.
Read moreSiloed mentality, health system suboptimization and the healthcare symphony: a Canadian perspective
Measuring and optimizing a health system is challenging when patient care is split between many independent organizations. For example, patients receive care from their primary care provider, outpatient specialist clinics, hospitals, private providers and, in some instances, family members. These silos are maintained through different funding sources (or lack of funding) which incentivize siloed service delivery. A shift towards prioritizing patient outcomes and keeping the patient at the centre of care is emerging. However, competing philosophies on patient needs, how health is defined and how health is produced and funded is creating and engraining silos in the delivery of health services. Healthcare and health outcomes are produced through a series of activities conducted by diverse teams of health professionals working in concert. Health professionals are continually learning from each patient interaction; however, silos are barriers to information exchange, collaborative evidence generation and health system improvement. This paper presents a systems view of healthcare and provides a systems lens to approach current challenges in health systems. The first part of the paper provides a background on the current state and challenges to healthcare in Canada. The second part presents potential reasons for continued health system underperformance. The paper concludes with a system perspective for addressing these challenges.
Read moreDeveloping Athletic Prosthetics Via 3D Printing
Prosthetic limbs present a highly unique research challenge, requiring intense customization for optimal use cases. These challenges are heightened for athletes, who engage with their prosthetics in highly competitive environments, placing them under tremendous stress. Thomas Normandeau, a champion Para Athlete, approached Camosun Innovates to develop such a prosthetic, able to aid him in his training regimens and reduce the risk of injury. Camosun Innovates undertook a human-centered design approach that foregrounded Normandeau’s needs and observations. Through a mixture of digital scanning and 3D-printed parts constructed using Nylon 12, a unique carbon-reinforced nylon traditionally used in the aerospace and automotive industries, the Camosun team was able to rapidly iterate a customized, properly-fitted prosthetic with unique, lightweight joint pieces precisely calibrated to Normandeau’s arm length, and without sacrificing the prosthetic’s ability to hold up under tension. The success of this prototype holds potential for other prosthetics both within and without the athletic sphere, with the potential to help users with exercise routines and common lifting and carrying tasks, from grocery shopping to household chores.
Read morePrevalence and Prognostic Significance of PIK3CA Mutation and CNV Status and Phosphorylated AKT Expression in Patients With Cervical Cancer Treated With Primary Surgery.
Currently, there are limited and conflicting reports on the prognostic utility of PIK3CA and associated pathway markers for cervical cancers treated with primary surgical management. Moreover, current studies are lacking complete characterization of adjuvant treatment with RT and/or chemotherapy. We aimed to document the prevalence, clinicopathologic, adjuvant treatment details, and prognostic value of PI3K/AKT pathway mutations and copy number variation and phosphorylated AKT status in patients with cervical cancers treated with primary surgery. A clinicopathologic review was performed on a retrospective cohort of 185 patients with cervical cancer, treated with primary surgery at a single tertiary institution. Next-generation sequencing and digital PCR was used to determine PI3K/AKT pathway mutational status and PIK3CA copy number variation, respectively, and fluorescent immunohistochemistry measured phosphorylated AKT expression. In all, 179 of 185 (96.8%) of tumors were successfully sequenced; 48 (26.8%) were positive for PI3K/AKT pathway mutations-the majority (n=37, 77.1%) PIK3CA mutations. PIK3CA mutation was associated with pathologically positive lymph nodes [12 (32%) vs. 22 (16%); P =0.022] and indication for postoperative chemoradiotherapy [17 (45.9%) vs. 32 (22.5%); P =0.004]. On multivariable analysis, PIK3CA status was not associated with overall survival ( P =0.103) or progression-free survival ( P =0.240) at 5yrs, nor was PIK3CA copy number variation status. phosphorylated AKT ≤ median significantly predicted for progression-free survival [multivariable hazard ratio 0.39 (0.17-0.89; P =0.025)] but not overall survival ( P =0.087). The correlation of PIK3CA with pathologic positive lymph node status yet lack of association with survival outcomes may be due to the use of adjuvant postoperative therapy. PIK3CA assessment before radical hysterectomy may help identify patients with a higher risk of node-positive disease.
Read moreFathers' Experiences in Alberta Family Integrated Care: A Qualitative Study.
The Family Integrated Care (FICare) program adapted for Alberta (AB) level II neonatal intensive care units (NICUs) aims to increase parental involvement and support during their NICU stay. The experience of fathers of preterm infants in a FICare program is currently unknown. To describe the experiences of fathers of preterm infants born at 320/7 to 346/7 weeks' gestational age with AB FICare. A qualitative substudy of a multicenter prospective cluster randomized controlled trial of FICare in 10 level II NICUs across Alberta. Fathers of preterm infants participated in a semistructured interview after discharge when their infants were at least 2 months' corrected gestational age. Journal entries written by fathers while in the NICU from the FICare intervention sites were also collected. Data were analyzed thematically and the interview and journal data were triangulated. Thirteen fathers (9 from the FICare intervention and 4 from standard care) participated in semistructured interviews and there were 24 journals collected. Seven themes emerged: fear of the unknown, mental preparation, identifying the father's role, parenting with supervision, effective communication, postneonatal intensive care transition, and family life. Fathers enrolled in AB FICare attributed their level of confidence and positive neonatal intensive care experience that continued postdischarge to the care and attention they received during hospitalization. AB FICare may improve experiences for fathers of preterm infants in the NICU with continuation postdischarge. Future research should include designing and evaluating father-specific NICU programs.
Read moreStudy protocol for Attachment & Child Health (ATTACHTM) program: promoting vulnerable Children’s health at scale
BackgroundChildren’s exposure to toxic stress (e.g., parental depression, violence, poverty) predicts developmental and physical health problems resulting in health care system burden. Supporting parents to develop parenting skills can buffer the effects of toxic stress, leading to healthier outcomes for those children. Parenting interventions that focus on promoting parental reflective function (RF), i.e., parents’ capacity for insight into their child’s and their own thoughts, feelings, and mental states, may understand help reduce societal health inequities stemming from childhood stress exposures. The Attachment and Child Health (ATTACHTM) program has been implemented and tested in seven rapid-cycling pilot studies (n = 64) and found to significantly improve parents’ RF in the domains of attachment, parenting quality, immune function, and children’s cognitive and motor development. The purpose of the study is to conduct an effectiveness-implementation hybrid (EIH) Type II study of ATTACHTM to assess its impacts in naturalistic, real-world settings delivered by community agencies rather than researchers under more controlled conditions.MethodsThe study is comprised of a quantitative pre/post-test quasi-experimental evaluation of the ATTACHTM program, and a qualitative examination of implementation feasibility using thematic analysis via Normalization Process Theory (NPT). We will work with 100 families and their children (birth to 36-months-old). Study outcomes include: the Parent Child Interaction Teaching Scale to assess parent-child interaction; the Parental Reflective Function and Reflective Function Questionnaires to assess RF; and the Ages and Stages Questionnaire – 3rd edition to examine child development, all administered pre-, post-, and 3-month-delayed post-assessment. Blood samples will be collected pre- and post- assessment to assess immune biomarkers. Further, we will conduct one-on-one interviews with study participants, health and social service providers, and administrators (total n = 60) from each collaborating agency, using NPT to explore perceptions and experiences of intervention uptake, the fidelity assessment tool and e-learning training as well as the benefits, barriers, and challenges to ATTACHTM implementation.DiscussionThe proposed study will assess effectiveness and implementation to help understand the delivery of ATTACHTM in community agencies.Trial registrationName of registry: https://clinicaltrials.gov/. Registration number: NCT04853888. Date of registration: April 22, 2021.
Read moreAn Exploration of Sedentary Behavior Patterns in Community-Dwelling People With Stroke: A Cluster-Based Analysis.
Long periods of daily sedentary time, particularly accumulated in long uninterrupted bouts, are a risk factor for cardiovascular disease. People with stroke are at high risk of recurrent events and prolonged sedentary time may increase this risk. We aimed to explore how people with stroke distribute their periods of sedentary behavior, which factors influence this distribution, and whether sedentary behavior clusters can be distinguished? This was a secondary analysis of original accelerometry data from adults with stroke living in the community. We conducted data-driven clustering analyses to identify unique accumulation patterns of sedentary time across participants, followed by multinomial logistical regression to determine the association between the clusters, and the total amount of sedentary time, age, gender, body mass index (BMI), walking speed, and wake time. Participants in the highest quartile of total sedentary time accumulated a significantly higher proportion of their sedentary time in prolonged bouts (P < 0.001). Six unique accumulation patterns were identified, all of which were characterized by high sedentary time. Total sedentary time, age, gender, BMI, and walking speed were significantly associated with the probability of a person being in a specific accumulation pattern cluster, P < 0.001 - P = 0.002. Although unique accumulation patterns were identified, there is not just one accumulation pattern for high sedentary time. This suggests that interventions to reduce sedentary time must be individually tailored.Video Abstract available for more insight from the authors (see the Video Supplemental Digital Content 1, available at: http://links.lww.com/JNPT/A343).
Read moreEfficacy of a Peruvian Botanical Remedy (Sabell A4+) for Treating Liver Disease and Protecting Gastric Mucosal Integrity
The purpose of this study was to determine the efficacy of a Peruvian botanical formulation for treating disorders of hepatic function and gastric mucosal integrity. The formulation A4+ (Sabell Corporation) contains extracts of Curcuma longa rhizome, Cordia lutea flower, and Annona muricata leaf. Individually these plants have been used as traditional remedies for liver disease. We report the efficacy of A4+ and its components using a variety of in vitro and in vivo disease models. The methods used included tests for antioxidant, anti-inflammatory, and antiviral activity as well as mouse models of liver disease, including Concanavalin A-induced immune-mediated hepatitis and a bile duct ligation model for evaluating sickness behaviour associated with liver disease. Rat models were used to evaluate the gastric mucosal protective property of A4+ following indomethacin challenge and to evaluate its anti-inflammatory action in an “air pouch” model. In all tests, A4+ proved to be more effective than placebo. A4+ was antioxidant and anti-inflammatory and diminished Hepatitis C virus replication in vitro. In animal models, A4+ was shown to protect the liver from immune-mediated hepatitis, improve behavioural function in animals with late stage liver disease, and protect the rat gastric mucosa from ulceration following NSAID exposure. We conclude that A4+ ameliorated many aspects of liver injury, inhibited hepatitis C virus replication, and protected the gastric mucosa from NSAIDs. These varied beneficial properties appear to result from positive interactions between the three constituent herbs.
Read moreStable isotopes of clay minerals from autoclave tests of oil sands: Implications for clay formation during steaming of Alberta Clearwater oil sands