检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

连续镀膜在真空蒸镀中的应用

现代机械 2024年第3期 13-18页

作者：林启璇韩辉张松林沈阳理工大学机械工程学院辽宁沈阳110000 成都超迈光电科技有限公司四川成都610100

蒸发镀膜是现有薄膜沉积中最为泛用的镀膜技术。针对现有蒸发镀膜设备在进行大批量薄膜制备时效率低下这一问题,基于规模生产需求设计了一种连续式蒸发镀膜设备,该设备通过设置多个仓室,仓与仓之间通过隔断阀连接,用以保持薄膜沉积仓内... 详细信息

蒸发镀膜是现有薄膜沉积中最为泛用的镀膜技术。针对现有蒸发镀膜设备在进行大批量薄膜制备时效率低下这一问题,基于规模生产需求设计了一种连续式蒸发镀膜设备,该设备通过设置多个仓室,仓与仓之间通过隔断阀连接,用以保持薄膜沉积仓内的真空度,真空室内设有工件盘自动装卡装置,可以节约大批量薄膜制备时重复真空抽气的时间及人工装卡时间。通过理论验算、真空抽气时间计算、受力仿真验证了结构的可行性和薄膜沉积效率的提升。

关键词：蒸发镀膜连续镀膜真空保持气路设计

在线全文

学校读者我要写书评

暂无评论

黄酮类化合物的生物活性及应用研究

现代食品 2024年第2期30卷 92-97页

作者：林启炫杜灿凯林稚凯赵秀娟刘姚广东生态工程职业学院广东广州510520 东莞城市学院广东东莞523419

黄酮类化合物是通过一些因子连接而成的化合物,其具有多种生物活性和药用价值,受到广泛的研究和应用,特别是药品方面。因此,本文分析了黄酮类化合物的抗癌、抗肿瘤、抗糖尿病、抗炎症、抗心脑血管疾病和抗衰老等生物活性,介绍了黄酮类... 详细信息

黄酮类化合物是通过一些因子连接而成的化合物,其具有多种生物活性和药用价值,受到广泛的研究和应用,特别是药品方面。因此,本文分析了黄酮类化合物的抗癌、抗肿瘤、抗糖尿病、抗炎症、抗心脑血管疾病和抗衰老等生物活性,介绍了黄酮类化合物的应用,旨在为黄酮类化合物的综合利用提供参考。

关键词：黄酮类化合物生物活性应用

Co-Production of High-Grade Dissolving Pulp,Furfural,and Lignin from Eucalyptus via Extremely Low Acid Pretreatment and Pulping Technologies and Catalysis

在线全文

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2023年第6期11卷 2555-2574页

作者： Chengxiang Li Yue Wu Chunhui Zhang Yao Liu qixuan lin Junli Ren State Key Laboratory of Pulp and Paper Engineering School of Light Industry and EngineeringSouth China University of TechnologyGuangzhou510640China

Hemicellulose and lignin are not reasonably utilized during the dissolved pulp preparation *** work aimed to propose a process for the co-production of dissolving pulp,furfural,and lignin from ***-grade dissolving pulp was prepared from eucalyptus using a combination of extremely low acid(ELA)pretreatment,Kraft cooking,and elementary chlorine-free(ECF)*** obtained pre-hydrolysate was catalytic conversion into furfural in a biphasic system,and lignin during Kraft cooking and ECF was *** process condition was discussed as well as the mass flow *** results showed that ELA pretreatment could effectively remove 80.1%*** with traditional hydrothermal pretreatment,the ELA pretreatment significantly increased the xylose yield from 5.05 to 14.18 g/L at 170℃ for 2 h,which had practical significance for furfural *** 82.7%furfural yield and 82.9%furfural selectivity were obtained from xylose-rich pre-hydrolysate using NaCl as a phase modifier in a biphasic system with 4-methyl-2-pentanone(MIBK)as an organic phase by ion exchange resin catalysts at 190℃ for 2 ***,the pretreated eucalyptus was subjected to Kraft cooking,and the optimal alkali amount was 14%.Then,the Kraft pulp was bleached using the O-D1-EP-D_(2) sequence,and dissolving pulp was obtained with an ISO brightness of 86.0%,viscosity of 463 mL/g,andα-cellulose content of 95.4%.The Kraft lignin which has a potential application was investigated by 2D-HSQC NMR and 31P *** results showed that the S/G ratio of Kraft lignin was 1.93,and the content of phenolic hydroxyl groups was 2.53 mmol/***,based on the above proposed process,30.5 g dissolving pulp,5.5 g furfural,and 21.2 g lignin per 100 g eucalyptus chips(oven dry)were *** research will provide new catalysis and pulping technical routes for dissolving pulp,furfural,and Kraft lignin products,which are in great demand in the chemical industry.

关键词： Eucalyptus extremely low acid pretreatment dissolving pulp furfural kraft lignin

Triethylamine-catalyzed Isomerization of Glucose to Fructose under Low Temperature Conditions in Aqueous Phase

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Paper And Biomaterials 2020年第4期5卷 27-35页

作者： Xiao Zhang Banggui Cheng qixuan lin Xiaohui Wang Rui Li Junli Ren State Key Laboratory of Pulp and Paper Engineering School of Light Industry and EngineeringSouth China University of TechnologyGuangzhouGuangdong Province510640China

Isomerization of glucose derived from lignocellulosic biomass is an important step in *** isomerized from glucose,is used as a highly attractive sweetener in the food and beverages ***,the prevalence of side reactions at high glucose concentrations is a serious issue,leading to a significant reduction in the fructose yield,especially in the aqueous *** this study,an efficient method for the conversion of highly concentrated glucose into fructose under low temperature conditions using triethylamine as the catalyst was *** was demonstrated that high fructose yield could be maintained at high glucose *** 60℃,fructose yield of 38.7%and fructose selectivity of 80.6%were achieved in 1 mol/L(approximately 17 wt%)*** glucose concentration was increased to 2 mol/L(approximately 31 wt%),the fructose yield and selectivity were maintained at 34.7%and 77.4%,respectively.13C nuclear magnetic resonance(NMR)spectrometer was used to examine the glucose isomerization *** to the NaOH catalytic system,triethylamine acted as a buffer to provide a stable alkaline environment for the catalytic system,further maintaining a high level of catalytic efficiency for the isomerization of glucose to fructose.

关键词： glucose isomerization fructose homogeneous catalysis triethylamine low temperature

Biochar-based Solid Acids as Catalysts for Carbohydrate Hydrolysis: A Critical Review

在线全文

学校读者我要写书评

暂无评论

Paper And Biomaterials 2018年第2期3卷 32-50页

作者： XiaoHui Wang qixuan lin YuHuan Yan BangGui Cheng Tao Song JunLi Ren State Key Laboratory of Pulp and Paper Engineering School of Light Industry and EngineeringSouth China University of Technology

Recently, increasing interest has been focused on the hydrolysis of carbohydrates to monosaccharides, among which, glucose and xylose as typical platform sugars can be used to produce chemicals and biofuels. As heterogeneous catalysts, solid acids have gained extensive attention for biomass biorefinery and could replace the conventional process owing to their excellent properties, including acceptable acidity and easy separation. In particular, biochar-based solid acids derived from biomass are promising for biomass conversion owing to the low-cost of feedstocks and the simple preparation procedure. Herein, we attempt to provide a critical overview of biochar-based solid acids for hydrolysis of carbohydrates into glucose and xylose. The preparation methods and properties of biochar-based catalysts as well as the influence of their properties on catalytic performance were discussed in detail. We also highlight the major challenges facing the use of biochar-based solid acids for carbohydrate hydrolysis.

关键词： biochar-based solid acid catalysts preparation properties carbohydrate hydrolysis

酸性熔盐水合物预处理麦秆高效制备木糖及其对酶解效率的影响

在线全文

学校读者我要写书评

暂无评论

化工进展 2023年第9期42卷 4974-4983页

作者：李由吴越钟禹林琦璇任俊莉华南理工大学轻工科学与工程学院制浆造纸工程国家重点实验室广东广州510640

秸秆预处理的目的是提高组分拆解以及酶解效率。本研究提出一种绿色温和、可循环使用的酸性熔盐水合物预处理农业秸秆的方法,能实现小麦秸秆中半纤维素的选择性拆解并定向解聚为木糖,同时保持较高的纤维素保留率。预处理体系以氯化锌熔... 详细信息

秸秆预处理的目的是提高组分拆解以及酶解效率。本研究提出一种绿色温和、可循环使用的酸性熔盐水合物预处理农业秸秆的方法,能实现小麦秸秆中半纤维素的选择性拆解并定向解聚为木糖,同时保持较高的纤维素保留率。预处理体系以氯化锌熔盐水合物为溶剂协同酸作催化剂,研究了反应温度、反应时间与硫酸浓度对组分拆解效率的影响,最优反应条件为:温度97℃,时间19.0min,硫酸质量分数3.3%。在此条件下木糖得率达到90.85%,纤维素保留率为85.87%。将预处理后残渣经过酶水解72h后,葡萄糖酶解得率最高可达77.81%。此外,还研究了该体系中氯化锌的循环利用情况,5次循环利用后,在保持氯化锌固体较高回收率的情况下(质量分数为80%),预处理木糖得率达87.69%,依然表现出良好的预处理效果。

关键词：麦秆熔盐水合物预处理木糖酶水解

维普期刊数据库博看期刊

基于RBF神经网络的气机轮带系统的变结构控制

在线全文

学校读者我要写书评

暂无评论

科学技术创新 2023年第17期 188-191页

作者：林琪暄福建水口发电集团有限公司福建福州

在电力系统中,高压气系统是水轮发电机运行的重要环节。轮式皮带传动因其结构简单、可提供过载保护,在水电机组中得到了广泛的应用。然而在高速运行时,轮带系统会产生大量振动,从而影响到气机安全性,缩短了轮带系统的使用年限。为抑制... 详细信息

在电力系统中,高压气系统是水轮发电机运行的重要环节。轮式皮带传动因其结构简单、可提供过载保护,在水电机组中得到了广泛的应用。然而在高速运行时,轮带系统会产生大量振动,从而影响到气机安全性,缩短了轮带系统的使用年限。为抑制和消除轮带系统的振动,提出基于RBF神经网络的气机轮带系统的变结构控制,来降低系统的控制时间。

关键词：水轮发电机高压气机轮带系统振动

在线全文

学校读者我要写书评

暂无评论

泡沫轻质土在软土地基高速公路中的应用探析

中国建材科技 2022年第2期31卷 132-133,69页

作者：林启选中铁十六局集团第三工程有限公司浙江湖州313000

桥头跳车是软土地基高速路常见病害。为预防和应对此病害,可在软基路段台背路基填筑泡沫轻质土,改善传统搅拌桩处理软土地基模式,减少施工后的沉降量。本文论述了泡沫轻质土在软土地基高速公路中的应用。

关键词：泡沫轻质土软土地基高速公路

重量法-电感耦合等离子体原子发射光谱法联用测定高硅铁矿中二氧化硅

在线全文

学校读者我要写书评

暂无评论

冶金分析 2023年第2期43卷 59-64页

作者：禤健文何颖贤林琦渲萧达辉广州海关技术中心广东广州510623

采用GB/T 6730.10—2014中规定的重量法测定高硅铁矿中二氧化硅时,为回收溶液中小部分可溶性硅,需要反复高温脱水、过滤,导致检测时间较长。为了缩短检测时间,采用重量法-电感耦合等离子体原子发射光谱法联用测定高硅铁矿中二氧化硅。... 详细信息

采用GB/T 6730.10—2014中规定的重量法测定高硅铁矿中二氧化硅时,为回收溶液中小部分可溶性硅,需要反复高温脱水、过滤,导致检测时间较长。为了缩短检测时间,采用重量法-电感耦合等离子体原子发射光谱法联用测定高硅铁矿中二氧化硅。高硅铁矿经酸溶过滤处理,含硅沉淀碱熔、酸化后,试样中大部分硅都形成了硅酸,再经高温脱水,形成的二氧化硅与氢氟酸反应生成四氟化硅气体,通过减少的质量计算硅含量;滤液中少量可溶性硅则采用电感耦合等离子体原子发射光谱(ICP-AES)测定;样品中二氧化硅含量为重量法和ICP-AES测定硅含量(以二氧化硅计)的合量。按照实验方法测定2个高硅铁矿样品中二氧化硅,发现滤液中可溶性硅占比为0.39%~2.0%。按照实验方法测定3个铁矿有证标准样品和7个国际能力验证样品(二氧化硅质量分数为9.595%~50.01%)中二氧化硅,二氧化硅的测定结果与认定值/参考值相符,结果的重现性满足GB/T 6730.10—2014规定。

关键词：重量法电感耦合等离子体原子发射光谱法(ICP-AES) 高硅铁矿二氧化硅