Low temperature plasma treatments were applied to linen with oxygen and argon, various level of discharge power and exposure time. Tbe fabric weight loss increased with the exposure time. Their effects on surface chem...Low temperature plasma treatments were applied to linen with oxygen and argon, various level of discharge power and exposure time. Tbe fabric weight loss increased with the exposure time. Their effects on surface chemical properties and morphology of flax fiber, and fabric wickability were investigated. X - ray photoelec-tron spectroscopy discovered that the surface oxygen content of the plasma treated sample was increased. Formation of voids and cracks on the fiber surface was revealed by the scanning electron microscopy. Fabric wickability first was increased and then decreased with the prolonged exposure.展开更多
AIM: To develop a short,enhanced functional ability Quality of Vision(faVIQ) instrument based on previous questionnaires employing comprehensive modern statistical techniques to ensure the use of an appropriate respon...AIM: To develop a short,enhanced functional ability Quality of Vision(faVIQ) instrument based on previous questionnaires employing comprehensive modern statistical techniques to ensure the use of an appropriate response scale,items and scoring of the visual related difficulties experienced by patients with visual impairment. · METHODS: Items in current quality-of-life questionnaires for the visually impaired were refined by a multi-professional group and visually impaired focus groups. The resulting 76 items were completed by 293 visually impaired patients with stable vision on two occasions separated by a month. The faVIQ scores of 75 patients with no ocular pathology were compared to 75 age and gender matched patients with visual impairment. ·RESULTS: Rasch analysis reduced the faVIQ items to 27. Correlation to standard visual metrics was moderate(r =0.32-0.46) and to the NEI-VFQ was 0.48. The faVIQ was able to clearly discriminate between age and gender matched populations with no ocular pathology and visual impairment with an index of 0.983 and 95% sensitivity and 95% specificity using a cut off of 29.·CONCLUSION: The faVIQ allows sensitive assessment of quality-of-life in the visually impaired and should support studies which evaluate the effectiveness of low vision rehabilitation services.展开更多
采用固含量及pH值、SEM、IR、TGA/DSC等分析方法对两种木素进行理化性能分析。对分别采用这两种木素的12 V 70 Ah样品电池进行低温放电性能、充电接受能力和循环寿命性能验证。结果发现:两种木素在官能团及热重分析的第1个吸热峰存在差...采用固含量及pH值、SEM、IR、TGA/DSC等分析方法对两种木素进行理化性能分析。对分别采用这两种木素的12 V 70 Ah样品电池进行低温放电性能、充电接受能力和循环寿命性能验证。结果发现:两种木素在官能团及热重分析的第1个吸热峰存在差异。木素B对铅酸蓄电池的低温放电性能、25℃下17.5%DoD循环寿命和60℃下17.5%DoD循环寿命更有利。通过综合分析木素B的理化性能和电化学性能得出了木素B的最佳添加量。展开更多
A new calcium aluminate cement CA-670 was studied in the system of tabular alumina, white fused alumina （WFA）, and bauxite based low cement castables. The flow ability, strength development, and hot strength （ HMOR...A new calcium aluminate cement CA-670 was studied in the system of tabular alumina, white fused alumina （WFA）, and bauxite based low cement castables. The flow ability, strength development, and hot strength （ HMOR ） were investigated. Different types of additives were used for the CA-670 bonded castables. The results show CA-670 provides a good workability for each type of＂ castables. CA-670 displays a good compatibility with different types of additives. Testing on different batches of CA-670 shows good reproducible properties in each castable, which manifests good consistency and reliability of CA-670.展开更多
文摘Low temperature plasma treatments were applied to linen with oxygen and argon, various level of discharge power and exposure time. Tbe fabric weight loss increased with the exposure time. Their effects on surface chemical properties and morphology of flax fiber, and fabric wickability were investigated. X - ray photoelec-tron spectroscopy discovered that the surface oxygen content of the plasma treated sample was increased. Formation of voids and cracks on the fiber surface was revealed by the scanning electron microscopy. Fabric wickability first was increased and then decreased with the prolonged exposure.
基金Supported by the Royal National Institute of the Blind,UK(No.226227)
文摘AIM: To develop a short,enhanced functional ability Quality of Vision(faVIQ) instrument based on previous questionnaires employing comprehensive modern statistical techniques to ensure the use of an appropriate response scale,items and scoring of the visual related difficulties experienced by patients with visual impairment. · METHODS: Items in current quality-of-life questionnaires for the visually impaired were refined by a multi-professional group and visually impaired focus groups. The resulting 76 items were completed by 293 visually impaired patients with stable vision on two occasions separated by a month. The faVIQ scores of 75 patients with no ocular pathology were compared to 75 age and gender matched patients with visual impairment. ·RESULTS: Rasch analysis reduced the faVIQ items to 27. Correlation to standard visual metrics was moderate(r =0.32-0.46) and to the NEI-VFQ was 0.48. The faVIQ was able to clearly discriminate between age and gender matched populations with no ocular pathology and visual impairment with an index of 0.983 and 95% sensitivity and 95% specificity using a cut off of 29.·CONCLUSION: The faVIQ allows sensitive assessment of quality-of-life in the visually impaired and should support studies which evaluate the effectiveness of low vision rehabilitation services.
文摘采用固含量及pH值、SEM、IR、TGA/DSC等分析方法对两种木素进行理化性能分析。对分别采用这两种木素的12 V 70 Ah样品电池进行低温放电性能、充电接受能力和循环寿命性能验证。结果发现:两种木素在官能团及热重分析的第1个吸热峰存在差异。木素B对铅酸蓄电池的低温放电性能、25℃下17.5%DoD循环寿命和60℃下17.5%DoD循环寿命更有利。通过综合分析木素B的理化性能和电化学性能得出了木素B的最佳添加量。
文摘A new calcium aluminate cement CA-670 was studied in the system of tabular alumina, white fused alumina （WFA）, and bauxite based low cement castables. The flow ability, strength development, and hot strength （ HMOR ） were investigated. Different types of additives were used for the CA-670 bonded castables. The results show CA-670 provides a good workability for each type of＂ castables. CA-670 displays a good compatibility with different types of additives. Testing on different batches of CA-670 shows good reproducible properties in each castable, which manifests good consistency and reliability of CA-670.
