In general, atomic emission spectrometry (AES) is an excellent technique for determination of metal elements. However, its capability of determining nonmetals has not been developed well. The major reasons are the res...In general, atomic emission spectrometry (AES) is an excellent technique for determination of metal elements. However, its capability of determining nonmetals has not been developed well. The major reasons are the resonance lines of most nonmetals lie in the vacuum ultraviolet spectral region and the ionic lines of these elements are difficult to be used because the ionization potentials of the elements are very high. And furthermore only He plasma can efficiently excit those ionic resonance lines. The practical application of HeICP-AES to determining the nonmetals is also difficult because its operating and perchace costs are very high. In contrast to HeICPAES, the costs of He microwave induced plasma (MIP)-AES are relatively low, HeMIP has a high excitation capability which can excite ionic lines of various nonmetals and the nonmetals can be determined by HeMIP-AES with a high sensitivity.展开更多
The purpose of this research is to develop a SolidWorks? model for transient temperature field of laser welding of PMMA/SS 304 materials for application in fabrication of the ultrasonic back-plate, with a view of opti...The purpose of this research is to develop a SolidWorks? model for transient temperature field of laser welding of PMMA/SS 304 materials for application in fabrication of the ultrasonic back-plate, with a view of optimizing the experimental conditions. The study is carried out on these materials because of the increasing application of both metals and non-metals. The work focuses specifically on these materials because they have been experimentally studied previously and as such, this study can be accepted as an assessment into feasibility of using SolidWorks? model to study the temperature field of the laser welding processes of metals and non-metals. The results of the SolidWorks? transient thermal model show that there is a concentration of high temperatures at the point of contact. It also shows that temperature decreases as we move in (between laser and the top face) to the thickness of the part. Additionally the maximum temperature occurs at the last point of the welding;this may be due to the accumulation of the temperature before arriving at the end. These findings are comparable to the previous simulated and experimental results on temperature field during laser welding of PMMA/SS 304 materials. However, SolidWorks? is shown to present a challenge in modeling a moving source of laser power.展开更多
背景:骨肉瘤是临床常见的疾病,近年来将无机非金属生物材料应用于骨肉瘤的治疗成为克服传统治疗瓶颈的新思路。目的:阐述目前无机非金属生物材料在骨肉瘤诊治中的应用,对其目前的研究现状及未来的应用前景进行综述。方法:应用计算机检索...背景:骨肉瘤是临床常见的疾病,近年来将无机非金属生物材料应用于骨肉瘤的治疗成为克服传统治疗瓶颈的新思路。目的:阐述目前无机非金属生物材料在骨肉瘤诊治中的应用,对其目前的研究现状及未来的应用前景进行综述。方法:应用计算机检索Web of Science、PubMed和中国知网数据库中涉及无机非金属生物材料用于骨肉瘤诊治相关的研究,主要检索用于骨肉瘤治疗的无机非金属生物材料的制备、应用、动物细胞实验等的实验文献,最终纳入69篇文献进行综述分析。结果与结论:①无机非金属生物材料具有生物相容性好、理化性质稳定、可生物降解并兼具促成骨功能等优良特征。②无机非金属材料固有的抗断裂性能弱、制备工艺要求高、药物与生物活性分子负载剂量小等不足,限制了其在承力区骨缺损、需持续可控缓释药物等情形的应用。③目前无机非金属材料在骨肉瘤治疗中被广泛应用于纳米载药平台、生物植入支架以及材料表面涂层等方面,并通过功能化改性在骨肉瘤的化学动力学治疗、纳米靶向诊治、催化治疗、免疫治疗和肿瘤热疗等新型诊疗策略中显示出良好效果,但这些研究大多停留在基础实验阶段,尚缺乏临床试验数据的支持。④改进无机非金属材料制备流程、探索新型功能改性策略并进一步广泛开展临床评价,已成为将现有基础研究转化为临床实践并促进无机非金属材料持续发展的关键。展开更多
文摘In general, atomic emission spectrometry (AES) is an excellent technique for determination of metal elements. However, its capability of determining nonmetals has not been developed well. The major reasons are the resonance lines of most nonmetals lie in the vacuum ultraviolet spectral region and the ionic lines of these elements are difficult to be used because the ionization potentials of the elements are very high. And furthermore only He plasma can efficiently excit those ionic resonance lines. The practical application of HeICP-AES to determining the nonmetals is also difficult because its operating and perchace costs are very high. In contrast to HeICPAES, the costs of He microwave induced plasma (MIP)-AES are relatively low, HeMIP has a high excitation capability which can excite ionic lines of various nonmetals and the nonmetals can be determined by HeMIP-AES with a high sensitivity.
文摘The purpose of this research is to develop a SolidWorks? model for transient temperature field of laser welding of PMMA/SS 304 materials for application in fabrication of the ultrasonic back-plate, with a view of optimizing the experimental conditions. The study is carried out on these materials because of the increasing application of both metals and non-metals. The work focuses specifically on these materials because they have been experimentally studied previously and as such, this study can be accepted as an assessment into feasibility of using SolidWorks? model to study the temperature field of the laser welding processes of metals and non-metals. The results of the SolidWorks? transient thermal model show that there is a concentration of high temperatures at the point of contact. It also shows that temperature decreases as we move in (between laser and the top face) to the thickness of the part. Additionally the maximum temperature occurs at the last point of the welding;this may be due to the accumulation of the temperature before arriving at the end. These findings are comparable to the previous simulated and experimental results on temperature field during laser welding of PMMA/SS 304 materials. However, SolidWorks? is shown to present a challenge in modeling a moving source of laser power.
文摘背景:骨肉瘤是临床常见的疾病,近年来将无机非金属生物材料应用于骨肉瘤的治疗成为克服传统治疗瓶颈的新思路。目的:阐述目前无机非金属生物材料在骨肉瘤诊治中的应用,对其目前的研究现状及未来的应用前景进行综述。方法:应用计算机检索Web of Science、PubMed和中国知网数据库中涉及无机非金属生物材料用于骨肉瘤诊治相关的研究,主要检索用于骨肉瘤治疗的无机非金属生物材料的制备、应用、动物细胞实验等的实验文献,最终纳入69篇文献进行综述分析。结果与结论:①无机非金属生物材料具有生物相容性好、理化性质稳定、可生物降解并兼具促成骨功能等优良特征。②无机非金属材料固有的抗断裂性能弱、制备工艺要求高、药物与生物活性分子负载剂量小等不足,限制了其在承力区骨缺损、需持续可控缓释药物等情形的应用。③目前无机非金属材料在骨肉瘤治疗中被广泛应用于纳米载药平台、生物植入支架以及材料表面涂层等方面,并通过功能化改性在骨肉瘤的化学动力学治疗、纳米靶向诊治、催化治疗、免疫治疗和肿瘤热疗等新型诊疗策略中显示出良好效果,但这些研究大多停留在基础实验阶段,尚缺乏临床试验数据的支持。④改进无机非金属材料制备流程、探索新型功能改性策略并进一步广泛开展临床评价,已成为将现有基础研究转化为临床实践并促进无机非金属材料持续发展的关键。
