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Fabrication of supported acid catalytic composite fibers by a simple and low-cost method and their application on the synthesis of liquid biofuel 5-ethoxymethylfurfural

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Green Energy & Environment 2022年第1期7卷 165-171页

作者： Yinhua Yan huiqin guo Kexin Li Liushui Yan Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle NanChang Hangkong UniversityNanChang330063China National-Local Joint Engineering Research Center of Heavy Metals Polluants Control and Resource Utilization NanChang Hangkong UniversityNanChang330063China

In this paper,sulfonic groups functionalized annealed bio-based carbon microspheres loaded polytetrafluoroethylene(A-BCMSs-SO_(3)H@PTFE)fibers with high activity,high stability,and easy regeneration were successfully fabricated by a simple method using low-cost raw *** characterization results showed that the annealed biomass carbon microspheres derived from waste Camellia oleifera shells were evenly distributed on the polytetrafluoroethylene fibers and the sulfonic groups can be successfully loaded on the surface of annealed biomass carbon microspheres by room temperature ***,the as-prepared A-BCMSs-SO_(3)H@PTFE fibers were applied to the acidcatalyzed synthesis of liquid biofuel *** catalytic experiment results indicated that the annealing temperature and time during catalyst preparation have a significant effect on the activity and selectivity of A-BCMSs-SO_(3)H@PTFE *** results of catalytic reaction kinetics showed that the yield of 5-ethoxymethylfurfural can reach more than 60%after 72 h of acid-catalyzed *** stability test showed that the as-prepared A-BCMSs-SO_(3)H@PTFE fibers still maintained a stable acid catalytic activity after four recycles.

关键词： Acid catalysis Waste Camellia oleifera shells Sulfonic groups Polytetrafluoroethylene fibers 5-Ethoxymethylfurfural

Sorption and cosorption of the nonionic herbicide mefenacet and heavy metals on soil and its components

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Journal of Environmental Sciences 2012年第3期24卷 427-434页

作者： Zhenyu Liu huiqin guo Huan He Cheng Sun State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210046China Shanghai Pudong New Area Environmental Monitoring Station Shanghai 200135China

Sorption and cosorption of the nonionic herbicide mefenacet and two typical metals （copper and silver） on black soil and its components （kaolinite and humic acid） were investigated. It was found that because of their different valences and properties, Cu2＋and Ag＋ presented different effects on the sorption of mefenacet. Due to the competition of Cu2＋, along with the shells of dense water formed by its surface complexation, for sorption surface area with mefenacet, the addition of Cu2＋ decreased the sorption amount of mefenacet on soil and its components, especially on humic acid. However, the addition of Ag＋ significantly enhanced the sorption of mefenacet, which was attributed to the softness of the cation that weakened the hydrophilicity of the local region around Ag＋-complexed functionalities, and thus mitigated the competitive sorption of water. In addition, the sorption of mefenacet on soil with or without the two metals was generally decreased with increasing pH, which was caused by the hydrolysis of carbonyl and carboxyl groups on the surface of the sorbents, π-π interaction between mefenacet and the soil organic matter, and so on. On the other hand, the presence of mefenacet seemed to have little effect on the sorption of Cu2＋ and Ag＋, indicating that Cu2＋ and Ag＋ might be sorbed strongly on the tested sorbents and the mefenacet added was too low in concentration to affect the sorption of the metals.

关键词： mefenacet copper silver soil kaolinite humic acid adsorption pH

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信息技术在中职钳工课程教学中的运用研究

成才之路 2024年第9期 85-88页

作者：郭会芹李华伟山东省济宁高新区职业中等专业学校山东济宁272000

钳工技术作为机电专业的一门必修课程,能够为学生提供必要的技术和相关的理论知识,对学生的发展十分重要。以往中职钳工课程教学受环境、设备等方面的诸多限制,教学效果不佳。网络技术的高速发展打破了钳工教学的众多壁垒,实现了跨学科... 详细信息

钳工技术作为机电专业的一门必修课程,能够为学生提供必要的技术和相关的理论知识,对学生的发展十分重要。以往中职钳工课程教学受环境、设备等方面的诸多限制,教学效果不佳。网络技术的高速发展打破了钳工教学的众多壁垒,实现了跨学科、跨领域,对中职钳工课程教学产生积极影响。教师应紧跟时代发展,使信息技术在中职钳工课程教学中得到有效运用,以提高中职钳工教学质量,提升学生职业素养。

关键词：信息技术中职钳工教学质量职业素养教学创新

硫酸亚铁叶酸片联合维生素C治疗妊娠妇女贫血的临床价值分析

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中外医疗 2024年第16期43卷 75-78页

作者：许晓燕王剑郭惠琴福清市第三医院妇产科福建福州350300

目的研讨硫酸亚铁叶酸片与维生素C联用对妊娠妇女贫血的治疗价值。方法便利选取2021年3月—2023年12月经福清市第三医院确诊贫血的134例妊娠妇女为研究对象,按随机数表法分为两组,每组67例。对照组予以硫酸亚铁联合维生素C方案治疗,... 详细信息

目的研讨硫酸亚铁叶酸片与维生素C联用对妊娠妇女贫血的治疗价值。方法便利选取2021年3月—2023年12月经福清市第三医院确诊贫血的134例妊娠妇女为研究对象,按随机数表法分为两组,每组67例。对照组予以硫酸亚铁联合维生素C方案治疗,观察组予以硫酸亚铁叶酸片联合维生素C方案用药。比较两组疗效、贫血指标以及妊娠结局。结果观察组治疗总有效率(95.52%)高于对照组(85.07%),差异有统计学意义(χ^(2)=4.174,P=0.041)。治疗后,观察组贫血指标高于对照组,观察组不良妊娠结局发生率少于对照组,差异有统计学意义(P均<0.05)。结论硫酸亚铁叶酸片联合维生素C能够提升妊娠妇女贫血的治疗效果,更有效减轻贫血程度,进而获得更理想的妊娠结局。

关键词：妊娠贫血硫酸亚铁叶酸片维生素C 妊娠结局

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One-step fabrication of mesoporous sulfur-doped carbon nitride for highly selective photocatalytic transformation of native lignin to monophenolic compounds

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Chinese Chemical Letters 2023年第1期34卷 440-445页

作者： Conghao Ku huiqin guo Kexin Li Qiong Wu Liushui Yan Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle Nanchang Hangkong UniversityNanchang 330063China National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource utilization Nanchang Hangkong UniversityNanchang 330063China Jiangxi Provincial Experimental Teaching Demonstration Center of Environmental Science and Engineering Nanchang Hangkong UniversityNanchang 330063China

Photocatalytic selective transform native lignin into valuable chemicals is an attractive but challenging ***,we report a mesoporous sulfur-doped carbon nitride(MSCN-0.5)which is prepared by a facile one-step thermal condensation *** is highly active and selective for the cleavage Cα-Cβbond inβ-O-4 lignin model compound under visible light radiation at room temperature,achieving 99%substrate conversion and 98%Cα-Cβbond cleavage *** studies revealed that the Cβ-H bond of lignin model compounds activated by holes and generate key Cβradical intermediates,further induced the Cα-Cβbond cleavage by superoxide anion radicals(·O2-)to produce aromatic *** Camellia oleifera shell(WCOS)was taken as a representative to further understand the reaction mechanisms on native lignin.33.2 mg of monophenolic compounds(Vanillin accounted for 22%and Syringaldehyde for 34%)can be obtained by each gram of WCOS lignin,which is 2.5 times as that of the pristine carbon *** present work offers useful guidance for designing metal-free heterogeneous photocatalysts for Cα-Cβbond cleavage to harvest monophenolic compounds.

关键词： Mesostructure Sulfur-doped carbon nitride Photocatalysis Lignin model compound Native lignin Monophenolic compounds

Fabrication of biobased heterogeneous solid Br?nsted acid catalysts and their application on the synthesis of liquid biofuel 5-ethoxymethylfurfural from fructose

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Green Energy & Environment 2018年第4期3卷 384-391页

作者： Yingying Wen Zhou Yu Kexin Li huiqin guo Yuhua Dai Liushui Yan Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle Nanchang Hangkong University

A series of biobased heterogeneous solid Br?nsted acid catalysts with perfect spherical microstructures are successfully fabricated directly from waste Camellia oleifera shells by a simple hydrothermal carbonization-annealing-sulfonation process. 350℃ low temperature annealing process helps to increase the activity of the catalyst due to the simultaneous maintenance of the spherical microstructure and aromatic carbon framework. As a renewable catalyst with low cost, the as-prepared materials are successfully applied on the synthesis of green renewable liquid biofuel 5-ethoxymethylfurfural(EMF) directly from fructose. In the catalytic test, the influences of reaction time and temperature, fructose concentration, and adding amount of the catalyst on the yield of EMF are investigated systematically. As a result, the optimal reaction temperature is 100℃, the EMF yield monotonically increases with prolonging the reaction time from 3 to 24 h, the optimal fructose concentration is0.5 mmol, and the EMF yield gradually increases with increasing the adding amount of the catalyst from 50 to 150 mg. In addition, the asprepared catalysts exhibit considerably high stability in the current EMF synthesis system, and they can maintain a similar level of reactivity after four catalytic cycles.

关键词： Hydrothermal carbonization Annealing Sulfonation 5-Ethoxymethylfurfural Fructose

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荔枝、龙眼育种研究进展

中国南方果树 2024年第3期53卷 1-6,15页

作者：卿昊炜黎明易晨歆张树伟郭慧勤彭宏祥丁峰广西壮族自治区农业科学院/广西作物遗传改良生物技术重点开放实验室南宁530007 广西大学农学院南宁530004 广西壮族自治区农业科学院园艺研究所南宁530007

我国是荔枝、龙眼原产国,荔枝、龙眼栽培历史悠久,野生荔枝、龙眼资源丰富.随着社会的发展,原有的荔枝、龙眼品种难以满足市场需求,选育符合市场需求的优良品种是荔枝、龙眼产业发展的迫切要求.本文综述了不同育种方法,即常规实生育种... 详细信息

我国是荔枝、龙眼原产国,荔枝、龙眼栽培历史悠久,野生荔枝、龙眼资源丰富.随着社会的发展,原有的荔枝、龙眼品种难以满足市场需求,选育符合市场需求的优良品种是荔枝、龙眼产业发展的迫切要求.本文综述了不同育种方法,即常规实生育种、杂交育种、分子标记辅助育种和生物技术育种运用于荔枝、龙眼的情况,并对今后荔枝、龙眼的育种发展进行了展望.

关键词：荔枝龙眼常规育种杂交育种分子标记辅助育种生物技术育种

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尿液细胞学巴黎报告系统在肿瘤专科医院临床应用的真实世界研究

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中华肿瘤杂志 2024年第7期46卷 703-709页

作者：赵焕张智慧郭会芹韦娜马海玥赵琳琳孙悦王聪常馨香毕新刚邢念增国家癌症中心/国家肿瘤临床医学研究中心/中国医学科学院北京协和医学院肿瘤医院病理科北京100021 郑州大学第一附属医院病理科郑州450052 国家癌症中心国家肿瘤临床医学研究中心中国医学科学院北京协和医学院肿瘤医院泌尿外科北京100021

目的探讨尿液细胞学巴黎报告系统(TPS)在临床应用中的实际意义。方法回顾性连续收集2020年1月至2022年6月中国医学科学院肿瘤医院1744份自然排空尿标本(751个尿液标本)细胞学诊断资料,以组织病理诊断为金标准,对比尿液细胞学诊断尿路上... 详细信息

目的探讨尿液细胞学巴黎报告系统(TPS)在临床应用中的实际意义。方法回顾性连续收集2020年1月至2022年6月中国医学科学院肿瘤医院1744份自然排空尿标本(751个尿液标本)细胞学诊断资料,以组织病理诊断为金标准,对比尿液细胞学诊断尿路上皮癌的灵敏度、特异度及每个诊断分类的高级别恶性风险。结果360例患者有组织病理诊断结果,细胞学诊断分类占比分别为未见高级别尿路上皮癌30.1%(226/751)、非典型尿路上皮细胞29.8%(224/751)、可疑高级别尿路上皮癌16.8%(126/751)、高级别尿路上皮癌21.2%(159/751)、非尿路上皮恶性肿瘤2.1%(16/751)。细胞学各个诊断级别所对应的组织病理相关高级别恶性风险分别为27.3%(未见高级别尿路上皮癌)、32.7%(非典型尿路上皮细胞)、74.7%(可疑高级别尿路上皮癌)、96.6%(高级别尿路上皮癌)、100.0%(非尿路上皮恶性肿瘤)。可疑高级别尿路上皮癌高级别恶性风险高于非典型尿路上皮细胞(P<0.001),高级别尿路上皮癌高级别恶性风险高于可疑高级别尿路上皮癌(P<0.001)。以可疑高级别尿路上皮癌为界值,细胞学诊断高级别尿路上皮癌的灵敏度和特异度分别为76.7%(165/215)和85.7%(18/21);以高级别尿路上皮癌为界值,细胞学诊断高级别尿路上皮癌的灵敏度和特异度分别为53.0%(114/215)和100.0%(21/21)。结论尿液细胞学诊断高级别尿路上皮癌有较高的灵敏度和特异度;TPS不同诊断级别的恶性风险不同,肿瘤专科医院的高恶性风险人群导致了各个诊断级别均有相对高的恶性占比及高级别恶性风险;TPS有助于临床管理,有较好的临床应用价值。

关键词：泌尿系肿瘤高级别尿路上皮癌尿液细胞学尿液细胞学巴黎报告系统高级别恶性风险

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立式双曲面网板水动力性能优化研究

海洋渔业 2024年第4期46卷 473-486页

作者：初文华赵子静郭慧琴武树龙叶旭昌崔森琦王一博上海海洋大学海洋科学学院上海201306 国家远洋渔业工程技术研究中心上海201306 上海海洋大学海洋科学与技术实验教学示范中心上海201306 上海海洋可再生能源工程技术研究中心上海201306

为研究结构型式及尺寸对立式双曲面网板水动力性能的影响机理,基于计算流体力学方法,建立立式双曲面网板三维数值模型,计算分析其水动力性能,并通过设计制作缩比模型开展动水槽试验,验证数值结果的有效性。开展曲面板弯曲度、弯曲度位... 详细信息

为研究结构型式及尺寸对立式双曲面网板水动力性能的影响机理,基于计算流体力学方法,建立立式双曲面网板三维数值模型,计算分析其水动力性能,并通过设计制作缩比模型开展动水槽试验,验证数值结果的有效性。开展曲面板弯曲度、弯曲度位置、支撑板间距等不同结构参数对立式双曲面网板水动力性能的影响规律研究,以探究最优化的结构设计方案。研究结果表明:曲面板弯曲度的同步改变和单一改变均会对立式双曲面网板的水动力性能产生不同程度的影响。如果只考虑扩张效果,曲面板A、B的弯曲度均设置为20%左右,或曲面板A弯曲度设置为15%、曲面板B弯曲度设置为25%左右,均可在一定范围内将立式双曲面网板的最大升力系数提高到最大值;但从网板综合性能考虑,后一方案可获得更高的最大升阻比。当曲面板弯曲度位置同步设置为50%时,网板升力系数可达到最大值,此时扩张效果最佳,而当曲面板弯曲度位置同步设置为20%时,最大升阻比达到峰值,网板综合性能相对更好。支撑板间距对立式双曲面网板水动力性能的影响不明显,将支撑板间距设置为420 mm左右,可在小冲角范围内提升其最大升阻比。

关键词：立式双曲面网板水动力性能数值模拟水槽试验结构参数