背景:既往认为黄韧带骨化在人群中罕见发生,随着研究深入,发现其发病率逐渐上升,这引起大量学者的研究兴趣。目的:通过检索科学引文索引数据库核心集自1999年以来的有关黄韧带骨化的研究成果,使用文献计量学方法对数据进行可视化分析,...背景:既往认为黄韧带骨化在人群中罕见发生,随着研究深入,发现其发病率逐渐上升,这引起大量学者的研究兴趣。目的:通过检索科学引文索引数据库核心集自1999年以来的有关黄韧带骨化的研究成果,使用文献计量学方法对数据进行可视化分析,回顾黄韧带骨化的研究历史,指示重要文献,梳理研究热点,为学者寻找研究方向提供思路。方法:以Web of Science核心集数据库为主,搜索并筛选黄韧带骨化相关论文,使用VOSviewer 1.6.19和CiteSpace 6.2.R6软件对年度发文量、研究国家、机构、被引文献、期刊、作者和关键词等进行可视化分析。结果与结论:①共纳入347篇文献,自1999年发文量呈螺旋上升,中国研究较日本起步晚,但是发文量后来居上,北京大学是发文量最多的机构,北京大学的陈仲强教授是发文量最多的学者。②被引用最多的10篇文献中5篇都与黄韧带骨化的手术治疗有关。③去除与研究主题直接相关的关键词,综合词频和中介中心性的结果发现,“胸椎脊髓病”“硬膜骨化”“微创手术”“后纵韧带骨化”处于领域研究的核心地位。④关键词聚类分析显示,黄韧带骨化的临床表现和手术治疗在疾病的研究中占比较大。⑤关键词时间线图及关键词突现分析显示,“微创手术”作为关键词出现在2015年前后,是突现强度最高的关键词,也是突现开始时间最晚的关键词,2019年开始受到学者广泛关注,关键词“硬膜骨化”的突现尚未结束。⑥黄韧带骨化的手术治疗一直处于研究前沿,微创手术方式的开发和研究、黄韧带骨化继发硬膜骨化的研究是该领域的研究热点。展开更多
To enhance the catalytic activity of copper ferrite(CuFe_(2)O_(4))nanoparticle and promote its application as combustion catalyst,a low-cost silicon dioxide(SiO_(2))carrier was employed to construct a novel CuFe_(2)O_...To enhance the catalytic activity of copper ferrite(CuFe_(2)O_(4))nanoparticle and promote its application as combustion catalyst,a low-cost silicon dioxide(SiO_(2))carrier was employed to construct a novel CuFe_(2)O_(4)/SiO_(2)binary composites via solvothermal method.The phase structure,morphology and catalytic activity of CuFe_(2)O_(4)/SiO_(2)composites were studied firstly,and thermal decomposition,combustion and safety performance of ammonium perchlorate(AP)and 1,3,5-trinitroperhydro-1,3,5-triazine(RDX)with it affecting were then systematically analyzed.The results show that CuFe_(2)O_(4)/SiO_(2)composite can remarkably either advance the decomposition peak temperature of AP and RDX,or reduce the apparent activation energy at their main decomposition zone.Moreover,the flame propagation rate of RDX was promoted by about 2.73 times with SiO_(2)content of 3 wt%,and safety property of energetic component was also improved greatly,in which depressing the electrostatic discharge sensitivity of pure RDX by about 1.89 times.In addition,the effective range of SiO_(2)carrier content in the binary catalyst is found to be 3 to 5 wt%.Therefore,SiO_(2)opens a new insight on the design of combustion catalyst carrier and will promote the application of CuFe_(2)O_(4)catalyst in solid propellant.展开更多
The effects of starch phosphate monoester content(SPC),namely C-3(C3P)and C-6 phosphate monoesters(C6P),on the starch properties were investigated using four potato starches with varied SPC/C3P/C6P and two nonphosphor...The effects of starch phosphate monoester content(SPC),namely C-3(C3P)and C-6 phosphate monoesters(C6P),on the starch properties were investigated using four potato starches with varied SPC/C3P/C6P and two nonphosphorylated maize starches with a similar range of amylose content(AC)as controls.The starch property results showed that a higher SPC is associated with lower turbidity,storage and loss modulus after storage,and water solubility,but higher swelling power(SP)and pasting viscosities.These findings suggested that SPC inhibited molecular rearrangement during storage and starch leaching during heating,and enhanced swelling and viscosities due to increased hydration and water uptake caused by the repulsion effect of phosphate groups and a less ordered crystalline structure.Increased SPC also resulted in lower resistant starch(RS)content in a native granular state but higher RS after retrogradation.Pearson correlations further indicated that SPC/C3P/C6P were positively correlated with peak(r^(2)=0.925,0.873 and 0.930,respectively),trough(r^(2)=0.994,0.968 and 0.988,respectively),and final viscosities(r^(2)=0.981,0.968 and 0.971,respectively).Notably,SPC,mainly C3P,exhibited a significantly positive correlation with SP(r^(2)=0.859)and setback viscosity(r^(2)=0.867),whereas SPC,mainly C6P,showed a weak positive correlation with RS after retrogradation(r^(2)=0.746).However,SPC had no significant correlations with water solubility,turbidity and rheology properties,which were more correlated with AC.These findings are helpful for the food industry to select potato starches with desired properties based on their contents of SPC,C3P,or C6P.展开更多
文摘背景:既往认为黄韧带骨化在人群中罕见发生,随着研究深入,发现其发病率逐渐上升,这引起大量学者的研究兴趣。目的:通过检索科学引文索引数据库核心集自1999年以来的有关黄韧带骨化的研究成果,使用文献计量学方法对数据进行可视化分析,回顾黄韧带骨化的研究历史,指示重要文献,梳理研究热点,为学者寻找研究方向提供思路。方法:以Web of Science核心集数据库为主,搜索并筛选黄韧带骨化相关论文,使用VOSviewer 1.6.19和CiteSpace 6.2.R6软件对年度发文量、研究国家、机构、被引文献、期刊、作者和关键词等进行可视化分析。结果与结论:①共纳入347篇文献,自1999年发文量呈螺旋上升,中国研究较日本起步晚,但是发文量后来居上,北京大学是发文量最多的机构,北京大学的陈仲强教授是发文量最多的学者。②被引用最多的10篇文献中5篇都与黄韧带骨化的手术治疗有关。③去除与研究主题直接相关的关键词,综合词频和中介中心性的结果发现,“胸椎脊髓病”“硬膜骨化”“微创手术”“后纵韧带骨化”处于领域研究的核心地位。④关键词聚类分析显示,黄韧带骨化的临床表现和手术治疗在疾病的研究中占比较大。⑤关键词时间线图及关键词突现分析显示,“微创手术”作为关键词出现在2015年前后,是突现强度最高的关键词,也是突现开始时间最晚的关键词,2019年开始受到学者广泛关注,关键词“硬膜骨化”的突现尚未结束。⑥黄韧带骨化的手术治疗一直处于研究前沿,微创手术方式的开发和研究、黄韧带骨化继发硬膜骨化的研究是该领域的研究热点。
基金the National Nature Science Foundation of China(Grant Nos.21673178,22105160)the Natural Science Foundation of Shaanxi Province(Grant No.2023-JC-ZD-07)+1 种基金the Foundation of Key Laboratory of Defense Science and technology(Grant No.6142603032213)the Key Science and Technology Innovation Team of Shaanxi Province(Grant No.2022TD-33).
文摘To enhance the catalytic activity of copper ferrite(CuFe_(2)O_(4))nanoparticle and promote its application as combustion catalyst,a low-cost silicon dioxide(SiO_(2))carrier was employed to construct a novel CuFe_(2)O_(4)/SiO_(2)binary composites via solvothermal method.The phase structure,morphology and catalytic activity of CuFe_(2)O_(4)/SiO_(2)composites were studied firstly,and thermal decomposition,combustion and safety performance of ammonium perchlorate(AP)and 1,3,5-trinitroperhydro-1,3,5-triazine(RDX)with it affecting were then systematically analyzed.The results show that CuFe_(2)O_(4)/SiO_(2)composite can remarkably either advance the decomposition peak temperature of AP and RDX,or reduce the apparent activation energy at their main decomposition zone.Moreover,the flame propagation rate of RDX was promoted by about 2.73 times with SiO_(2)content of 3 wt%,and safety property of energetic component was also improved greatly,in which depressing the electrostatic discharge sensitivity of pure RDX by about 1.89 times.In addition,the effective range of SiO_(2)carrier content in the binary catalyst is found to be 3 to 5 wt%.Therefore,SiO_(2)opens a new insight on the design of combustion catalyst carrier and will promote the application of CuFe_(2)O_(4)catalyst in solid propellant.
基金the China Scholarship Council funding(CSC,202006150028)for her PhD study at the University of Copenhagen,Denmark.
文摘The effects of starch phosphate monoester content(SPC),namely C-3(C3P)and C-6 phosphate monoesters(C6P),on the starch properties were investigated using four potato starches with varied SPC/C3P/C6P and two nonphosphorylated maize starches with a similar range of amylose content(AC)as controls.The starch property results showed that a higher SPC is associated with lower turbidity,storage and loss modulus after storage,and water solubility,but higher swelling power(SP)and pasting viscosities.These findings suggested that SPC inhibited molecular rearrangement during storage and starch leaching during heating,and enhanced swelling and viscosities due to increased hydration and water uptake caused by the repulsion effect of phosphate groups and a less ordered crystalline structure.Increased SPC also resulted in lower resistant starch(RS)content in a native granular state but higher RS after retrogradation.Pearson correlations further indicated that SPC/C3P/C6P were positively correlated with peak(r^(2)=0.925,0.873 and 0.930,respectively),trough(r^(2)=0.994,0.968 and 0.988,respectively),and final viscosities(r^(2)=0.981,0.968 and 0.971,respectively).Notably,SPC,mainly C3P,exhibited a significantly positive correlation with SP(r^(2)=0.859)and setback viscosity(r^(2)=0.867),whereas SPC,mainly C6P,showed a weak positive correlation with RS after retrogradation(r^(2)=0.746).However,SPC had no significant correlations with water solubility,turbidity and rheology properties,which were more correlated with AC.These findings are helpful for the food industry to select potato starches with desired properties based on their contents of SPC,C3P,or C6P.
