8 research outputs found
Ultrathin titania coating for high-temperature stable SiO2/Pt nanocatalysts
The facile synthesis of silica supported platinum nanoparticles with ultrathin titania coating to enhance metal-support interactions suitable for high temperature reactions is reported, as thermal and structure stability of metal nanoparticles is important for catalytic reactions.close8
Associations between missing teeth and the risk of cancer in Korea: a nationwide cohort study
Abstract Background Poor dental health is correlated with an increased risk of cancer. Using a nationwide population cohort database, we investigated which cancer is highly associated with poor dental health and which dental indicator mostly influences cancer risk. Methods This study was conducted using the National Health Checkups (NHC) and National Health Insurance System (NHIS) database in Korea. NHC in Korea includes dental examinations. We retrieved subjects who underwent NHC between 2002 and 2003 and their medical information in NHIS database was followed until December 31,2015. Results Data for 200,170 who participated in the NHC between 2002 and 2003 were analysed. During the maximum follow-up period of 13 years, 15,506 (7.75%) subjects were diagnosed with cancer. The median time to cancer diagnosis after the dental examination was 87 months (range, 51–119 months). The proportion of people with missing teeth was higher in the cancer-diagnosed group than in the non-diagnosed group (26.27% vs. 22.59%, p < 0.001). Among several dental health factors, missing teeth were significantly associated with higher cancer risk. Subjects with missing teeth showed a 12% increased cancer risk compared to those without missing teeth (odds ratio [OR] 1.12, 95% confidence interval [CI], 1.08–1.16). The risk was significantly higher, especially in lung, head and neck, pancreatic, liver, biliary, and esophageal cancers (OR 1.27 [95% CI, 1.14–1.41], 1.32 [95% CI, 1.13–1.55], 1.27 [95% CI, 1.02–1.58], 1.24 [95% CI, 1.1–1.4], 1.28 [95% CI, 1.03–1.6], 1.4 [95% CI, 1.04–1.88], respectively). Conclusions Missing teeth were the most important dental indicator associated with cancer risk. Korean adults with missing teeth should be cautious about the risk of several cancers, particularly head and neck, lung, gastrointestinal, hepatobiliary, and pancreatic cancer
High-Performance and Industrially Feasible Ni-Rich Layered Cathode Materials by Integrating Coherent Interphase
For
developing the industrially feasible Ni-rich layered oxide cathode
with extended cycle life, it is necessary to mitigate both the mechanical
degradation due to intergranular cracking between primary particles
and gas generation from the reaction between the electrolyte and residual
Li in the cathode. To simultaneously resolve these two issues, we
herein propose a simple but novel method to reinforce the primary
particles in LiNi<sub>0.91</sub>Co<sub>0.06</sub>Mn<sub>0.03</sub>O<sub>2</sub> by providing a Li-reactive material, whose spinel interphase
is coherent with the surface of the cathode. The modified structure
significantly outperforms analogous bare samples: they conserve more
than 90% of the initial capacity after 50 cycles and also exhibit
a greater rate capability. By tracking the same particle location
during cycling, we confirmed that the current method significantly
reduces crack generation because the provided coating material can
penetrate inside the grain boundary of the secondary particle and
help maintain the volume of the primary particle. Finally, first-principles
calculations were implemented to determine the role of this spinel
material, i.e., having intrinsically isotropic lattice parameters,
superior mechanical properties, and only a small volume change during
delithiation. We believe that the proposed method is straightforward
and cost-effective; hence, it is directly applicable for the mass
production of Ni-rich cathode material to enable its commercialization
Predicting Voluntary Exercise Training among Korean Firefighters: Using Elicitation Study and the Theory of Planned Behavior
Background: Firefighters are required to have high levels of aerobic and anaerobic power because they often perform physically demanding work in dangerous environments. Therefore, it is important to find out salient factors influencing voluntary exercise training among Korean firefighters based on well-validated theory. Methods: The present study conducted an elicitation study to elicit salient behavioral, normative, and control beliefs about exercise training among Korean firefighters and identified salient beliefs that have a significant indirect effect on behavior through intention using structural equation modeling. Results: Although ten modal salient beliefs obtained from our elicitation study are similar to those elicited from previous TPB belief-based research with a focus on exercise behavior, only three of these (i.e., “improves my physical ability” (coef. = 0.078, p = 0.006), “takes too much time” (coef. = 0.064, p = 0.023), and “colleagues” (coef. = 0.069, p = 0.016) indirectly influenced exercise training behavior through intention among Korean firefighters. Conclusions: Our results may contribute to the literature by providing important information suggesting that three modal salient beliefs are major cognitive determinants of exercise training behavior among Korean firefighters and they may play an essential role in developing effective programs or policies for promoting Korean firefighters’ exercise training