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Treatment of psoriatic skin lesions with a new Er:Yag laser technology: A case series study
摘要： Erbium: YAG (Er:YAG) laser with RecoSMA technology. This laser emits thousands of microbeams of energy causing superficial epidermal ablation and a separation of dermal fibers due to a mechanical-acoustic and resonance effect. The aim of this study is to evaluate the clinical efficacy of Erbium: YAG (Er:YAG) laser with RecoSMA in the treatment of stable psoriasis vulgaris lesions. A questionnaire completed by 112 patients enrolled in the study. Photographs taken before each session, the analysis of the dynamics index PASI and histological studies were analyzed to visually monitor the clinical progress. The analyses were carried out with the help of computer software. The results after treatment of average number of sessions per course showed the complete clinical remission of the skin lesions in over 87% of the patients treated. The Er:YAG laser and RecoSMA have demonstrated the high effectiveness of the laser method of treating skin manifestations of the disease and improving the quality of life of patients.
关键词： Er:YAG,mechanical-acoustic effect,laser,PASI index,RecoSMA technology,psoriasis vulgaris,space-modulated ablation
更新于2025-09-23 15:21:01
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Effect of Grain Size on the Fracture Behavior of Organic-Inorganic Halide Perovskite Thin Films for Solar Cells
摘要： Organic-inorganic halide perovskite (OIHP) thin ?lms at the heart of the new perovskite solar cells (PSCs) are very brittle, limiting the mechanical reliability of PSCs. Here we show that ?ne-grained MAPbI 3 (prototypical OIHP) ?lms with grain size (~290 nm) smaller than the typical ?lm thickness (~500 nm) tend to fracture intergranularly, resulting in low toughness (0.41 J.m ?2 ). In contrast, MAPbI 3 /substrate interfacial fracture occurs in ?lms with grains larger (~730 nm) than the ?lm thickness, resulting in much higher toughness (1.14 J.m ?2 ). Thus, coarse-grained OIHP ?lms are deemed desirable for not only improved PSCs performance and stability but also mechanical reliability.
关键词： Thin ?lms,Solar cells,Halide perovskites,Mechanical behavior,Grain boundaries
更新于2025-09-23 15:21:01
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Reinforcement of a laser-textured 316L steel with CuCoBe-diamond composites through laser sintering
摘要： The aim of this work was the production and the characterization of a laser textured 316L stainless steel reinforced with CuCoBe-diamond composites by laser sintering. The composites were obtained from CuCoBe and synthetic diamond with different particle sizes by mechanical alloying. The influence of the reinforcement on the physical, chemical and surface properties was analyzed. The results showed that the textured pattern consisted of square pyramids with a machined area of approximately 80%. The interfaces between the steel and the reinforcement after sintering are well defined and sharp. A good adherence of the diamond particles to the CuCoBe matrix was achieved. The laser sintering process did not induce any phase transformations or oxidation of the reinforcement. The steel reinforced with the biggest diamond particles exhibited substantially better surface performance than the untextured material.
关键词： composites,sintering,diamond,steel,Mechanical,316L,CuCoBe,alloying,texturing,laser
更新于2025-09-23 15:21:01
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Selective laser melting 316L/CuSn10 multi-materials: Processing optimization, interfacial characterization and mechanical property
摘要： Adopting selective laser melting (SLM), a typical technology of additive manufacturing (AM), to form multi-material metallic composites is a challenging and promising field. In this study, SLM 316L/CuSn10 multi-material composites was an innovative attempt to develop functional and structural materials with excellent properties of steel and copper alloys. Dense 316L/CuSn10 specimens with no interfacial macrocracks were successfully fabricated. Results showed that the Vickers microhardness gradually decreased from 329.5±12.5 HV in 316L region to 172.8HV±7.4 in CuSn10 region. The ultimate tensile strength and flexural strength of 316L/CuSn10 sample was 210 MPa, which was higher than the steel/copper alloys fabricated by other methods. It indicated an ideal interfacial bonding condition of 316L/CuSn10 multi-material, which was benefited from sufficient agitation of the molten pools and elements diffusion in the term of continuous distribution of elements and the enrichment of the heterogeneous alloy phases. Also, the grain refinement by re-melting and recrystallization upgraded the bonding performance at the interface. Finally, the 316L/CuSn10 lattice structure was formed by SLM, hinting at the prospects for industrial applications of steel/copper multi-material by SLM in future.
关键词： Selective laser melting (SLM),Mechanical properties,Interface,316L/CuSn10,Multi-material,Microstructure
更新于2025-09-23 15:21:01
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CsPbBr3 nanowire polarized light-emitting diodes through mechanical rubbing
摘要： Anisotropic films composed of aligned CsPbBr3 nanowires (NWs) have been successfully fabricated using a mechanical rubbing method. The films with dense and uniform morphology show polarization photoluminescence (PL) behavior. Combining with an optimal device structure, a polarized light-emitting diode (LED) with a turn-on voltage as low as 6.5 V was achieved.
关键词： CsPbBr3 nanowires,anisotropic films,mechanical rubbing,polarized light-emitting diode,photoluminescence
更新于2025-09-23 15:21:01
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CFRP laser texturing to increase the adhesive bonding: morphological analysis of treated surfaces
摘要： Surface roughness of the adherends represents an important factor for manufacturing a reliable bonded joint in structural applications. In case of bonding of parts in carbon fibre reinforced polymer (CFRP), an increase of roughness parameters can be obtained with various techniques. In this paper, the morphology obtained from a CO2 laser texturing on CFRP laminates were investigated. CFRP laminates were manufactured and subjected to laser texturing with various densities. In particular, the densities of treatment have been defined as a function of the grid dimensions of the texture. Subsequently, non-contact measurements were carried out to evaluate the evolution of the surface roughness parameters as a function of the density of the laser treatment. Results showed a strong correlation between surface roughness and density of treatment. In conclusion, these results were compared with experimental tests, which showed that the mechanical performance for ENF bonded joints was limited only by the flexural mechanical resistance of the CFRP adherends. As a result of this work, the developed laser texturing approach is potentially able to increase the mechanical resistance in the function of the real local load acting on the complex bonded joint, optimizing time and cost process.
关键词： surface modification,surface roughness/morphology,Composites,adhesion by mechanical interlocking
更新于2025-09-23 15:21:01
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Thermo-mechanical degradation at finger-solder interface in a crystalline silicon photovoltaic module under thermal fatigue conditions
摘要： The thermo-mechanical performance of fingers in a crystalline silicon photovoltaic (PV) cell is often discussed in the domain of solder layer degradation due to their close proximity, and vulnerability under transient temperature variations. This paper discusses thermo-mechanical damage at common interfaces of the solder layer. It was established that the finger-solder interface is most prone to breakages. Further, effect of variable solder geometrical parameters on damage accumulation at the finger-solder interface was investigated. Solder thickness was found to be a crucial parameter. The variable width simulation demonstrated increased damage accumulation due to the case of over-soldering.
关键词： fingers,photovoltaic modules,solder,thermal cycling,thermo-mechanical degradation
更新于2025-09-23 15:21:01
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Study on the Microstructure and Properties of Al/Cu Laser Filled Solder Joint
摘要： Using IPG-YLS-4000 fiber laser to weld T2 copper plate and LY16 aluminum alloy plate, using Zn-10%Al flux cored wire as filler material, the microstructure of the joint was observed and analyzed by SEM and EDS, and the effects of laser power, welding speed and welding line energy on the mechanical properties of the joint were studied. The results show that the joints are mainly divided into copper side brazing area, weld center area and aluminum side fusion welding area. Among them, there are two interface reaction layers composed of intermetallic compound (IMC) in the copper side brazing area, the first layer is CuZn compound in the form of strip, and the second layer is Al2Cu phase in the form of shoot. The central area of the weld is mainly composed of massive α-Al phase and branched β-Zn phase. The tensile strength of the joint increases first and then decreases with the increase of laser power, welding speed and welding line energy. The thickness of IMC layer grows linearly with the increase of line energy. The best process parameters: when the laser power is 2200 W, the welding speed is 0.9 m/min, the welding line energy is 1446.67 J/cm, the IMC layer thickness is 10.11 μm, and the tensile strength reaches the maximum value, 252.6 MPa.
关键词： intermetallic compound,Al/Cu laser welding,microstructure,mechanical properties,Zn-10%Al flux cored wire
更新于2025-09-23 15:21:01
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Experimental and numerical investigation of selective laser meltinga??induced defects in Tia??6Ala??4V octet truss lattice material: the role of material microstructure and morphological variations
摘要： The remarkable progress in additive manufacturing has promoted the design of architected materials with mechanical properties that go beyond those of conventional solids. Their realization, however, leads to architectures with process-induced defects that can jeopardize mechanical and functional performance. In this work, we investigate experimentally and numerically as-manufactured defects in Ti–6Al–4V octet truss lattice materials fabricated with selective laser melting. Four sets of as-manufactured defects, including surface, microstructural, morphological, and material property imperfections, are characterized experimentally at given locations and orientations. Within the characterized defects, material property and morphological defects are quanti?ed statistically using a combination of atomic force microscopy and micro–computed tomography to generate representative models that incorporate individual defects and their combination. The models are used to assess the sensitivity to as-manufactured defects. Then, the study is expanded by tuning defects amplitude to elucidate the role of the magnitude of as-designed defects on the mechanical properties of the lattice material.
关键词： mechanical properties,octet truss lattice,additive manufacturing,defects,Ti–6Al–4V,selective laser melting
更新于2025-09-23 15:21:01
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Structural and Optical Properties of Two-Stage CuInSe <sub/>2</sub> Thin Films Studied by Real Time Spectroscopic Ellipsometry
摘要： In this paper, a robotic cell rotation method based on the minimum rotation force is presented to adjust oocyte orientation in biological applications. In this method, the minimum rotation force, which can control the rotation angle (RA) of the oocyte quantitatively and generate minimum oocyte deformations, is derived through a force analysis on the oocyte in rotation. To exert this force on the oocyte, the moving trajectories (MT) of the injection micropipette (IM), are determined using mechanical properties of the oocytes. Further, by moving the IM along the designed MT, the rotation force control is achieved. To verify the feasibility of this method, a robotic rotation experiment for batch porcine oocytes are performed. Experimental results demonstrate that this system rotates the oocyte a10t an average speed of 28.6s/cell and with a success rate of 93.3%. More importantly, this method can generate much less oocyte deformations during cell rotation process compared with the manual method, while the average control error of RA in each step is only 1.2 (versus averagely 8.3 in manual operation), which demonstrates that our method can effectively reduce cell deformations and improve control accuracy of the RA.
关键词： micro-operation,force control,Cell mechanical properties,cell rotation
更新于2025-09-23 15:21:01