3D mesoporous structure assembled from monoclinic M-phase VO2 nanoflakes with enhanced thermochromic performance

Monoclinic M-phase VO₂ is a promising candidate for thermochromic materials due to its abrupt change in the near infrared (NIR) transmittance along with the metal-to-insulator transition (MIT) at a critical temperature ∼68 °C. However, low luminous transmittance (T_lum), poor solar energy modulation ability (ΔT_sol), and high phase transition temperature (T_c) can limit the application of VO₂ for smart windows. To overcome these limitations, 3D mesoporous structure can be employed in VO₂ films. Herein, 3D mesoporous structures assembled from monoclinic M-phase VO₂ nanoflakes with a pore size of about 2–10 nm were synthesized by a hydrothermal method using Ensete ventricosum fiber (EF) as a template followed by calcination at 450 °C. The prepared film exhibited excellent thermochromic performance with balanced T_lum = 67.3%, ΔT_sol = 12.5%, and lowering T_c to 63.15 °C. This is because the 3D mesoporous structure can offer the uniform dispersion of VO₂ nanoflakes in the film to enhance T_lum, ensure sufficient VO₂ nanoflakes in the film for high ΔT_sol and lower T_c. Therefore, this work can provide a green approach to synthesize 3D mesoporous structures assembled from monoclinic M-phase VO₂ nanoflakes and promote their application in smart windows.

Herein, 3D mesoporous structures assembled from monoclinic M-phase VO₂ nanoflakes were successfully synthesized for enhanced thermochromic performance.     

Prevalence of pressure ulcers in africa: A systematic review and meta-analysis

BackgroundA recent global review of pressure ulcers contained no studies from Africa.ObjectiveTo identify the prevalence and incidence of pressure ulcers in Africa.Data sourcesBibliographic databases, African specific databases, grey literature.Study eligibility criteriaStudies with prevalence or incidence data of pressure ulcers from Africa since the year 2000.ParticipantsAny age, including children, in any setting, specifically including hospital patients from any clinical area but not restricted to hospital settings.Study appraisal and synthesis methodsHoy score for bias, Joanna Briggs Institute Critical Appraisal Instrument.MethodWe followed the PRISMA guideline for systematic reviews. We searched Embase, Medline, Scopus, CINHAL, Google Scholar, specialist African databases and grey literature for studies reporting incidence or prevalence data.ResultsNineteen studies met the inclusion criteria and were included in the study. Point prevalence rates varied from 3.4% to 18.6% for medical/surgical and other general hospital units with a pooled prevalence of 11%, for grades II-IV 5%. For spinal injury units the pooled prevalence was 44%.Limitationsrestricted to English, French and Arabic.ConclusionPrevalence of pressure ulcers in Africa reported here is similar to figures from a recent review of prevalence in Europe and two recent global reviews of hospitalised patients. Prevalence of pressure ulcers in spinal cord injury patients is similar to figures from a review of developing countries. The reporting of prevalence is lacking in detail in some studies. Studies using an observational design employing physical examination of patients showed higher prevalence than those relying on other methods such as medical notes or databases.Implications of key findingsFurther prevalence and incidence studies are needed in Africa. Reporting of such studies should ensure items in the “Checklist for Prevalence Studies” from Joanna Briggs Institute (or similar well regarded resources) are addressed and the PICOS model and PRISMA guidelines are employed.Systematic review registration numberProspero registration number CRD42020180093     

A case report of a teenager with hepatitis B surface antigen‐positive multifocal hepatocellular carcinoma in a noncirrhotic liver

Hepatitis B virus is a known carcinogen for hepatocellular carcinoma, which is rare in the pediatric population. We report a 13‐year‐old patient with hepatitis B surface antigen‐positive multifocal hepatocellular carcinoma in a noncirrhotic liver. Her APRI score was 0.24. Her BCLC stage was C, and her caregiver opted for palliative care.     

Attitudes, Perceived Norms, and Intentions: A Needs Assessment Study of the Influenza Immunization Intentions of Elderly Citizens in Vermont

CONTEXT: Influenza and pneumonia rank among the 5 leading causes of death among persons aged 65 and over. Although immunization has been demonstrated to prevent influenza or reduce its incidence and associated complications among the elderly, it has been largely underutilized. PURPOSE: This study examined the association of attitudes, perceived norms, and intention to obtain influenza immunization among community-dwelling rural elderly. The goal was to design an effective intervention program to increase the rate of flu immunization among the rural elderly. METHODS: In spring 2000, random-digit dialing selected 1,239 households in 2 rural Vermont counties. Telephone interviews were conducted with 799 persons aged 60 or older, resulting in a response rate of 65%. FINDINGS: Factor analyses revealed 2 dimensions underlying attitudes and perceived norms. Subsequent regression analyses confirmed that 1 attitude construct--perceived benefits--and both normative indices were significant predictors of immunization intention, explaining 45% of its variation. CONCLUSIONS: An intervention program targeting rural elderly should emphasize the benefits and perceived side effects of immunization. The program should publicize that most elderly believe that the advantages of influenza immunization outweigh the disadvantages. These findings will inform an intervention program designed to increase immunization coverage among rural seniors in Vermont.     

Effectiveness of femoral nerve blockade for pain control after total knee arthroplasty.

Control of postoperative pain is a major concern for patients undergoing total knee arthroplasty (TKA). The purpose of this study was to investigate pain control and opioid use, as well as length of stay, ambulation time, antiemetic use, and degree of mobilization for patients undergoing total knee arthroplasty, comparing those receiving femoral nerve block (FNB) to those receiving no femoral nerve block. Using retrospective patient record data, 133 subjects from an acute care community hospital in western Canada were split into three groups: no FNB (control group, n = 49), single-shot FNB (n = 33), and continuous FNB (n = 51). There was a statistically significant improvement in pain control on day of surgery for the FNB group compared with the no-FNB group, and reduction in opioid usage on days 0, 1, and 2 in the continuous FNB group compared with the no-FNB and single-shot group. Also noted was a statistically significant reduction in antiemetic use in the FNB compared with the no-FNB group on the day after surgery. This study is in accordance with earlier studies that support continuous FNB as an effective method for achieving postoperative pain control and reducing opioid use for patients undergoing TKA.