氦氖激光照射对小鼠脾淋巴细胞增殖反应影响的试验研究

目的：研究氦氖激光照射对小鼠脾淋巴细胞增殖反应的影响。方法：以BALB/c小鼠为研究对象，应用7.33，11.00,14.67,22.00和36.67j/cm^2五种剂量的氦氖激光器照射小鼠哈德腺，连续照射8d，并于照射开始后第3、6、9、13和第17d动脉监测实验鼠脾淋巴细胞增殖反反应：结果:7.33,11.00,14.67和22.00j/cm^2四个剂量组均可增强脾淋巴细胞增殖反应，但11.00，14.67和22.00j/cm^2三个剂量组在第3d就达到峰值，此后逐步下降，而7.33j/cm^2剂量组直到第9d才达到峰值，且维持时间最短。与此相反的是，36.67j/cm^2剂量组则在第3d就出现抑制效应，直至第13d才恢复至正常水平。结论：适当剂量的氦氖激光照射可对小鼠脾淋巴细胞增殖反应产生增强效应，而过大剂量He-Ne激光则对免疫机能产生抑制效应。     

Qualitative analysis of PZT (52/48) MPB using different synthesis methods

The current work reports a comparison between the structural and optical attributes of PZT (52/48) powder and thin film prepared via solid-state reaction and sol-gel spin-coating technique, respectively. The two obtained PZT samples, PZT-I corresponding to powder which was calcined at 875°C for 2 h, and PZT-II corresponding to a thin film which was annealed at 650°C for 2 h, were investigated via X-Ray Diffraction, Raman Spectroscopy, UV–Vis Spectroscopy, and SEM analysis. The diffraction spectra suggested the creation of a polycrystalline perovskite structure in both the samples. The optical band gap was evaluated using Tauc's relation. The bandgap values were found to be 3.2 eV for PZT-I and 3.87 eV for PZT-II. The bandgap values are significantly different for the PZT materials prepared by the two different methods.     

Ce-based organic framework enhanced the hydrogen evolution ability of ZnCdS photocatalyst

Ce-based organic framework materials [UIO-66(Ce)] were prepared, and the UIO-66(Ce)/ZnCdS composite was attained by microwave irradiation. Moreover, the photocatalytic hydrogen production activity was evaluated. The experimental results revealed that the ZnCdS nanoparticle was decorated on the surface of UIO-66(Ce), and the hydrogen production ability of ZnCdS nanoparticle was improved by UIO-66(Ce) significantly. The hydrogen production yield of UIO-66(Ce)/ZnCdS reaches 3.958 mmol/g·h, in which is as about 1.95 times as that of ZnCdS (2.031 mmol/g·h). The improvement for photocatalytic hydrogen production yield is because UIO-66(Ce) can facilitate the photoinduced carriers to separating.     

基于多阵元光离子化传感的泄漏监测系统研究

针对传统检测方法无法适用特定空间狭小、难以精确定位应用场景的研究现状,结合乙二醇冷却液挥发性并可被紫外灯电离的特点,研制了基于光离子化的紫外传感器,提出了阵列传感方法,通过在易泄漏部位营造密闭空间,将多阵元传感器放入密闭空间检测,搭配后端的数据处理模块与上位机模块,构建了冷却液泄漏阵列检测平台。在模拟泄漏测试环境中取得了良好的测试效果。试验结果表明,该系统突破了狭小空间冷却液渗漏实时在线监测关键技术,整个系统对微小泄漏的反应灵敏,在用0.1ml乙二醇冷却液模拟微泄漏试验中,设置报警浓度为3ppm后,报警时间保持在10s以内,反应及时,处理快速,可扩展性强,为复杂的冷却环境下及时排除冷却液故障提供实用化检测手段。     

A comprehensive evaluation of vat-photopolymerization resins and alumina slurries for ceramic stereolithography

Ceramic slurries play an essential role in the fabrication of complex ceramic parts in ceramic stereolithography (CSL), in which photosensitive monomer is the focus. In this study, the comprehensive properties of commonly used monomers were quantitatively studied by a new evaluation system. As a result, ACMO, PONPGDA and EOTMPTA were selected as the final three monomers with better properties. On this basis, an optimal combination of the above monomers with the best comprehensive performance was obtained by blending them at a ratio of 60:60:40. Next, the influence of different resins on the properties of alumina slurries was investigated. It was found that using the mixture of the above three monomers, an excellent as-prepared slurry with low viscosity, small shrinkage and good photo-curable ability was obtained.     

Structural characterization,defect evolution and luminescence properties of natural CaF2 under 10 MeV electron irradiation

Present study investigates the response of various coloured variants of natural fluorite (CaF₂) to 10 MeV electron beam irradiation at accumulated dose of 5–10 MGy. The fluorite specimens did not show any post irradiation radioactivity. However, after irradiation the specimens developed purple colouration of different shades depending on the dose. In-depth characterization of the as-received and irradiated specimens using XPS and Raman spectroscopy confirm the relocation of fluorine (F) anions at interstitial sites and formation of metallic calcium (Ca). The calculated displacement cross sections for F and Ca indicate that it is easier to form fluorine anion interstitials within lattice structure. However, the estimated lower fraction of interstitial fluorine (∼14%) as compared to metallic Ca (>50%) is attributed to their surface diffusion and desorption. Electron irradiation was found to cause photoluminescence quenching in all the CaF₂ specimens that is likely caused by a radiation-induced formation of competing recombination channels.     

Elucidating the degradation mechanism of 0.5Gd2Zr2O7·0.5TRPO under multi-energy He ion irradiation

Gd₂Zr₂O₇ has long been considered as one of the most promising waste forms and has attracted broad interest in the field of nuclear waste immobilization. This work utilizes multi-energy He-irradiation to study the microstructural and helium bubble evolution of Gd₂Zr₂O₇ immobilizing with the final waste after partitioning high-level liquid waste by using the trialkyl phosphide (TRPO waste, the waste load is 50 wt%) in an experimentally feasible time frame. Interestingly, at less than 40 nm below the He-irradiated surface (Region I), there are a significant number of well-aligned large spherical He bubbles with diameters ranging from 5 to 25 nm and a severely amorphous structure. The mechanism of these novel phenomena may be related to enhanced migration rate of vacancies by high electronic energy loss, promoting the combination of vacancies with relatively high-density He atoms, suppressing the recombination-annihilation of vacancies and interstitial atoms, thus accelerating the irradiation amorphization.     

Multifunctional BPs/MT@PLGA-ALE Nanospheres for Treatment of Osteoporotic Fracture with Near-Infrared Irradiation

Osteoporotic fracture, which is a clinical complication of osteoporosis featured with the imbalance of bone homeostasis. Non-surgical intervention is frequently required post-operatively to ameliorate the fracture healing. Nevertheless, current non-surgical therapies are mostly performed in a non-targeted manner without giving enough consideration to the pathological characteristics of osteoporosis. Therefore, it is highly desirable to develop an optimal strategy for promoting fracture healing under osteoporotic conditions. In this study, a multifunctional therapeutic nanoplatform is designed to work in conjunction with near-infrared irradiation. Specifically, poly (lactic-co-glycolic acid) (PLGA) is functionalized with alendronate (ALE) and black phosphorus nanosheets (BPs) together with melatonin (MT) molecules are encapsulated by PLGA-ALE to produce the multifunctional BPs/MT@PLGA-ALE nanospheres. In this structure, BPs degrade gradually and deliver mild photothermal effects to facilitate bone regeneration, whereas MT has the dual-capability of suppressing osteoclastogenesis and promoting osteogenesis. Moreover, ALE endows the nanoplatform with the reliable bone-targeting capacity to improve the therapeutic effects. The combination of BPs/MT@PLGA-ALE nanospheres and photothermal therapy significantly improve post-surgical healing of osteoporotic fracture by modulating the tumor necrosis factor and cell death-related signaling pathways. This study reveals a promising strategy to treat osteoporotic fracture and broadens the application of nanomaterials in the biomedical field.     

Photo-enhanced catalytic hydrogen production from ammonia borane dehydrogenation over cobalt doped n-type semiconductors

Aimed at achieving the photo-enhanced dehydrogenation of ammonia borane (NH₃BH₃) in aqueous solutions, p-type cobalt (Co) doped n-type semiconductors (TiO₂, WO₃ and TiO₂-WO₃) based heterojunction structures were proposed for hydrogen production. In the present study, the Co doped n-type semiconductors such as titanium dioxide (TiO₂) and tungsten oxide (WO₃) were synthesized by hydrothermal synthesis to obtain heterojunction structure and characterized by XRD, SEM/EDS, TEM, FT-IR and UV–Vis techniques. The photo-enhanced catalytic hydrogen production from NH₃BH₃ dehydrogenation over Co doped n-type semiconductors were tested under light-irradiation (UV-light and day-light) in presence of organic and inorganic scavengers. The experimental results showed that Co @TiO₂-WO₃ heterojunction structure improved hydrogen production almost three times in terms of TOF values (821 h⁻¹) compared to Co@TiO₂ (292 h⁻¹) due to photoelectrons and hole pairs increases activity. The pseudo first order kinetics based on Langmuir-Hinshelwood (L-H) kinetic model fitting revealed that apparent adsorption constant calculated in presence of Co@TiO₂-WO₃ with lowest value as 4.99 h⁻¹ and 9.75 h⁻¹ for both region, respectively.