8 research outputs found
En multifunktions Walker för att bistå äldre Mobility
 The walker is regarded as a promising solution to provide additional support to maintain balance or stability while walking for elderly people. Significant assistance in improving mobility technology have been observed from literature review. However, the walkers available in the market is possible to optimize in design and include additional functionality, including getting out of the seat at home with caregiver aid, emergency care aided system. Considering falling down is a public healthcare problem, we designed the emergency aided system to rescue them [1].  In this paper, we proposed a multiple function elderly mobility and emergency aid system, was developed and modelled by Inventor 2015, and finite element analysis. Simulation was then created to get the value of safety factor, and make comparison base on the results from structural calculation. Finally, the application of few features of the improved walker was illustrated
Tetracycline Removal by Activating Persulfate with Diatomite Loading of Fe and Ce
Persulfate (PS)-based oxidation technology is efficient in removing refractory organics from water. A novel diatomite (DIA) support Fe and Ce composite (Fe-Ce/DIA) was prepared for activating persulfate to degrade tetracycline in water. The Fe and Ce were uniformly loaded on DIA, and the total pore size of Fe-Ce/DIA was 6.99 × 10−2 cm3/g, and the average pore size was 12.06 nm. Fe-Ce/DIA presented a good catalytic activity and 80% tetracycline was removed under the persulfate system. The Fe-Ce/DIA also had photocatalytic activity, and the corresponding tetracycline removal efficiency was 86% under UV irradiation. Fe-Ce/DIA exhibited less iron dissolution rate compared with Fe-DIA. The tetracycline degradation rate was enhanced when the temperature increased. The optimal tetracycline removal efficiency was obtained when the conditions were of persulfate 10 mM, Fe-Ce/DIA dosage 0.02 g/L, and tetracycline concentration 50 mg/L. In addition, Fe-Ce/DIA showed a wide pH application and good reusability and stability
Preparation of CsPb(Cl/Br)3/TiO2:Eu3+ composites for white light emitting diodes
The inherent single narrow emission peak and fast anion exchange process of cesium lead halide perovskite CsPbX3 (X = Cl, Br, I) nanocrystals severely limited its application in white light-emitting diodes. Previous studies have shown that composite structures can passivate surface defects of NCs and improve the stability of perovskite materials, but complex post-treatment processes commonly lead to dissolution of NCs. In this study, CsPb(Cl/Br)3Â NCs was in-situ grown in TiO2 hollow shells doped with Eu3+ ions by a modified thermal injection method to prepare CsPb(Cl/Br)3/TiO2:Eu3+ composites with direct excitation of white light without additional treatment. Among them, the well-crystalline TiO2 shells acted as both a substrate for the dopant, avoiding the direct doping of Eu3+ into the interior of NCs to affect the crystal structure of the perovskite materials, and also as a protection layer to isolate the contact between PL quenching molecules and NCs, which significantly improves the stability. Further, the WLED prepared using the composites had bright white light emission, luminous efficiency of 87.39Â lm/W, and long-time operating stability, which provided new options for the development of perovskite devices
Arrays of Triangular Au Nanoparticles with Self-Cleaning Capacity for High-Sensitivity Surface-Enhanced Raman Scattering
In the realm of surface-enhanced Raman scattering (SERS)
research,
the precise detection and effective cleansing of substances are critical.
This study introduces a novel Au nanotriangle/Cs2AgBiBr6 (Au NT/CABB) SERS array, synthesized through a meticulous
two-step process, which demonstrates remarkable SERS effectiveness.
Using Rhodamine 6G (R6G) as the probe molecule, this substrate accurately
detects target molecules and achieves an exceptional detection threshold
of 1 × 10–13 M. The integration of CABB into
the substrate endows it with photocatalytic properties, thereby accelerating
the degradation of adsorbed signaling molecules and significantly
enhancing the reusability of the Au NT/CABB arrays. Furthermore, the
arrays exhibit outstanding SERS and photocatalytic performance with
methylene blue (MB) and MB&R6G mixed solutions, distinguishing
between the two signal molecules with high fidelity. Additionally,
the SERS enhancement mechanism of the Au NT/CABB array is analyzed
by the finite-difference time-domain (FDTD) simulation and energy
band structure. These findings highlight the substrate’s dual
capability in leveraging both electromagnetic and chemical enhancement
mechanisms for superior SERS performance, complemented by an integrated
photocatalytic self-cleaning feature, making it a promising candidate
for environmental detection applications