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Gas-discharge induced flash sintering of YSZ ceramics at room temperature

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Journal of Advanced Ceramics 2022年第4期11卷 603-614页

作者： Yuchen ZHU Hongyang ZHOU Rongxia huang Nianping YAN Xilin WANG guanghua LIU Zhidong JIA Engineering Laboratory of Power Equipment Reliability in Complicated Coastal Environments Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China School of Electromechanical Engineering Guangdong University of TechnologyGuangzhou 510006China State Grade Jiangxi Electric Power Research Institute Nanchang 330000China State Key Laboratory of New Ceramics and Fine Processing Tsinghua University School of Materials Science and TechnologyTsinghua UniversityBeijing 100084China

This is the first study to conduct the flash sintering of 3 mol%yttria-stabilized zirconia(3YSZ)ceramics at room temperature(25℃)under a strong electric field,larger than 1 kV/*** the standard atmospheric pressure(101 kPa),the probability of successful sintering is approximately half of that at low atmospheric pressure,lower than 80 *** success of the proposed flash sintering process was determined based on the high electric arc performance at different atmospheric pressures ranging from 20 to 100 *** 3YSZ samples achieved a maximum relative density of 99.5%with a grain size of~200 *** results showed that as the atmospheric pressure decreases,the onset electric field of flash sintering decreases,corresponding to the empirical formula of the flashover ***,flash sintering was found to be triggered by the surface flashover of ceramic samples,and the electric arc on the sample surfaces floated upward before complete flash sintering at overly high pressures,resulting in the failure of flash *** study reveals a new method for the facile preparation of flash-sintered ceramics at room temperature,which will promote the application of flash sintering in the ceramic industry.

关键词： flash sintering yttria-stabilized zirconia(YSZ) room temperature flashover AC field low atmospheric pressure

基于BP神经网络的烘烤变黄期烟叶含水量预测

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天津农业科学 2021年第10期27卷 62-67,73页

作者：张广普李峥黄广华徐志强钟永健赵程虹浙江中烟工业有限责任公司浙江杭州310024

量化研究烘烤变黄期烟叶颜色变化,实现烘烤变黄期叶片含水量的无损检测。利用色差仪检测‘K326’中部叶不同变黄温度(烤前32,34,36,38,40,42℃)下的叶片颜色参数(L*、a*、b*、C、H°),通过因子分析法对作为输入变量的颜色参数进行筛选,... 详细信息

量化研究烘烤变黄期烟叶颜色变化,实现烘烤变黄期叶片含水量的无损检测。利用色差仪检测‘K326’中部叶不同变黄温度(烤前32,34,36,38,40,42℃)下的叶片颜色参数(L*、a*、b*、C、H°),通过因子分析法对作为输入变量的颜色参数进行筛选,分别构建不同温度点的叶片含水量预测模型。网络模型训练结果表明:各温度点叶片含水量预测模型的模拟值与目标值的回归系数均达到显著水平或极显著水平,各网络模型预测误差在0~2.0范围内的样本占比达到88%以上,预测误差在0~3.0范围内的样本占比均达到95%以上。构建的不同变黄温度叶片含水量预测模型具有较高的准确性,在烘烤变黄期可利用BP神经网络基于烟叶颜色参数进行叶片含水量的快速无损估测。

关键词：烤烟变黄期 BP神经网络颜色参数叶片含水量预测模型

采用水性嵌段高分子分散剂制备水基铝酸钴陶瓷墨水及其喷墨打印性能

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中国粉体技术 2023年第2期29卷 159-170页

作者：黄广华陆有军潘志东王燕民深圳职业技术学院霍夫曼先进材料研究院博士后创新实践基地广东深圳518055 北方民族大学材料科学与工程学院宁夏银川528138 华南理工大学材料科学与工程学院广东广州510640

合成3种水性无规则共聚物分散剂(Ⅰ:PASG、 Ⅱ:PAI和Ⅲ:PSG)和2种水性嵌段分散剂(Ⅳ:PMAA-b-AMPS和Ⅴ:PSSS-b-GMA),并应用于制备水基铝酸钴(CoAl_(2)O_(4))陶瓷墨水;采用比色法、激光粒度分析法、沉降法分别分析在添加不同分散剂时,亚... 详细信息

合成3种水性无规则共聚物分散剂(Ⅰ:PASG、 Ⅱ:PAI和Ⅲ:PSG)和2种水性嵌段分散剂(Ⅳ:PMAA-b-AMPS和Ⅴ:PSSS-b-GMA),并应用于制备水基铝酸钴(CoAl_(2)O_(4))陶瓷墨水;采用比色法、激光粒度分析法、沉降法分别分析在添加不同分散剂时,亚微米粒级CoAl_(2)O_(4)颗粒在水性悬浮液中的颜色特性和分散稳定性;通过傅里叶变换红外光谱法、热重法、电动势法探究不同分散剂在CoAl_(2)O_(4)颗粒表面的吸附机理;通过流变仪、表面张力仪、静置沉降、离心沉降分析水基CoAl_(2)O_(4)陶瓷墨水的黏度、表面张力、稳定性;基于半经验法计算和分析水基CoAl_(2)O_(4)墨水在陶瓷生坯上的打印适应性。结果表明:在添加质量分数为5%、以质量比为9∶1混合的水性嵌段分散剂时,水基CoAl_(2)O_(4)陶瓷墨水中的色料颗粒表现出最佳分散稳定性;在水基CoAl_(2)O_(4)陶瓷墨水中加入质量分数为20%的二甘醇单丁醚(DG)可有效增加墨水的黏度,降低表面张力,且该水基CoAl_(2)O_(4)陶瓷墨水在陶瓷生坯上的打印适应性强。

关键词：水性嵌段分散剂混合分散剂分散稳定喷墨打印性能

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磁分离药剂智能投加控制系统设计与应用

机械设计与制造工程 2022年第5期51卷 54-58页

作者：黄光华王哲晓肖波杨治清吉青青杨涛中建环能科技股份有限公司四川成都610045

针对采用手动加药存在的药剂过量、药剂不足以及药剂残留等问题,通过对水质在线检测仪表的优选,结合磁性絮体具有密实、边界清晰、易于沉降的特点,设计了由在线浊度检测系统、图像处理系统、可编程逻辑控制器(PLC)自动加药系统组成的磁... 详细信息

针对采用手动加药存在的药剂过量、药剂不足以及药剂残留等问题,通过对水质在线检测仪表的优选,结合磁性絮体具有密实、边界清晰、易于沉降的特点,设计了由在线浊度检测系统、图像处理系统、可编程逻辑控制器(PLC)自动加药系统组成的磁分离药剂智能投加控制系统。该系统以浊度控制为主、以图像控制为辅的控制方案实现精确投加,不仅节省了约20%的药剂,还降低了工人的劳动强度。

关键词：磁分离水处理技术智能控制磁种投加

Comparative Analysis of Nutrient Composition of Caulerpa lentillifera from Different Regions

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Journal of Ocean University of China 2020年第2期19卷 439-445页

作者： ZHANG Meijian MA Yurong CHE Xinyi huang Zumei CHEN Peng XIA guanghua ZHAO Meihui Engineering Research Center of Utilization of Tropical Polysaccharide Resources Ministry of EducationHainan UniversityHaikou 570228China Hainan Engineering Research Center of Aquatic Resources Efficient Utilization in South China Sea Hainan UniversityHaikou 570228China Collaborative Innovation Center of Seafood Deep Processing Dalian Polytechnic UniversityDalian 116034China College of Food Science and Technology Hainan UniversityHaikou 570228China

This study investigated the difference of nutrient composition in Caulerpa lentillifera collected from different *** nutrient compositions of *** from China's Hainan and Shandong provinces were determined and compared with those from Semporna(Malaysia),Sabah(Malaysia),Petchburi(Thailand),and two other species of seaweeds(Malaysia).The results showed that the polysaccharide and protein contents of *** from Hainan(44.82%±0.98%and 12.5%±0.70%),Shandong(43.22%±1.42%and 14.7%±0.72%),Petchburi(59.27%±2.31%and 12.49%±0.30%),and Sabah(44.02%±2.01%and 19.38%±1.48%)were higher than those of Eucheuma cottonii(26.49%±3.01%and 9.76%±1.33%)and Sargassum polycystum(33.49%±1.70%and 5.40%±0.07%),*** polyunsaturated fatty acid contents in *** from Hainan(29.98%)and Shandong(22.11%)were higher than that in Semporna(16.76%±0.27%),Sabah(9.49%),and ***(20.34%±0.43%),but lower than that in ***(51.55%±0.57%).In Caulerpa lentillifera of Hainan and Shandong provinces,the essential amino acid(EAA)/total amino acid(TAA)ratios were 35.22%and 38.78%,respectively;and the EAA/ETAA ratios were 54.36%and 63.35%,*** EAA composition of *** was close to the ideal model of Food and Agriculture Organization/World Health *** was rich in mineral elements,including calcium((3315.85±127.55)mg(100 g)^-1 and(3728.35±92.38)mg(100 g)^-1),magnesium((6715.74±82.58)mg(100 g)^-1 and(8128.59±242.72)mg(100 g)^-1),and trace elements,including iron((510.65±5.47)mg(100 g)^-1 and(1972.97±183.35)mg(100 g)^-1),selenium((1.04±0.08)mg(100 g)^-1 and(0.83±0.15)mg(100 g)^-1),and zinc((33.90±0.13)mg(100 g)^-1 and(11.75±2.05)mg(100 g)^-1).These results showed that *** was more nutritious than *** or *** in terms of polysaccharide,protein,and fatty acid ***,both *** species collected from Hainan and Shandong provinces show more basic ***,***

关键词： Caulerpa lentillifera nutrient composition fatty acid amino acid mineral comparative analysis

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肝脂片对大鼠脂肪肝形成的防治作用

中国药师 2005年第5期8卷 397-399页

作者：唐瑛黄光华杨李左娟邱炜朱以良王晓昆广州军区武汉总医院医学实验科武汉430070

目的:观察肝脂片对大鼠脂肪肝形成的防治作用。方法:采用高脂饲料复制大鼠脂肪肝模型,同时分别给予不同剂量的肝脂片,以肝脏的脂质含量、脂变程度为衡量指标,观察其预防和治疗效果。结果:肝脂片能使脂肪肝大鼠的肝组织中总胆固醇(TC)和... 详细信息

目的:观察肝脂片对大鼠脂肪肝形成的防治作用。方法:采用高脂饲料复制大鼠脂肪肝模型,同时分别给予不同剂量的肝脂片,以肝脏的脂质含量、脂变程度为衡量指标,观察其预防和治疗效果。结果:肝脂片能使脂肪肝大鼠的肝组织中总胆固醇(TC)和甘油三酯(TG)含量显著降低,SOD活力明显升高,MDA含量明显减少,肝细胞的脂变程度明显减轻。结论:肝脂片对大鼠脂肪肝的形成具有明显的预防作用。

关键词：脂肪肝肝脂片脂质抗氧化

红螯螯虾(Cherax quadricarinatus)卵黄蛋白原未知功能结构域(DUF1943)的原核表达及纯化鉴定

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安徽农业大学学报 2021年第6期48卷 940-946页

作者：王瑞韦孜娜吕敏杨彦豪黄黎明韦秀颖卢天和黄光华杨慧赞广西壮族自治区水产科学研究院南宁530021 广西大学动物科学技术学院南宁530005

通过外源表达并纯化得到红螯螯虾(Cherax quadricarinatus)卵黄蛋白原(Vitellogenin,Vg)的DUF1943结构域片段,为开展其后续相关功能及机制研究奠定基础。根据Gen Bank数据库中公布的红螯螯虾卵Vg基因序列(登录号AF306784.1),查找到DUF1... 详细信息

通过外源表达并纯化得到红螯螯虾(Cherax quadricarinatus)卵黄蛋白原(Vitellogenin,Vg)的DUF1943结构域片段,为开展其后续相关功能及机制研究奠定基础。根据Gen Bank数据库中公布的红螯螯虾卵Vg基因序列(登录号AF306784.1),查找到DUF1943结构域的氨基酸序列(617—918aa),对其理化性质与基本结构等进行了理论评估,结合大肠杆菌密码子偏好对其进行了序列改造和密码子优化,采用全基因合成的方法得到了DUF1943的基因片段,将其连接到Pet28a(+)内构建了Pet28a(+)-DUF1943的融合表达载体,探索了该融合载体在大肠杆菌系统中的最佳表达参数,采用溶解法和上柱层析法对收获到的蛋白包涵体进行复性。全基因合成方法制备得到的DUF1943目的基因为921bp,成功构建了Pet28a(+)-DUF1943的融合表达载体,诱导Pet28a(+)-DUF1943表达的最佳条件为:当单克隆菌液OD600达到0.6时,添加0.5 mmol·L^(-1)的诱导剂IPTG,置于37℃条件下培养4 h。表达的DUF1943多肽以包涵体形式为主,在SDS-PAGE胶的35 kDa附近呈现特异性条带,收集包涵体进行破碎,经2 mol·L^(-1)盐酸胍溶解和Ni-NTA层析后最终收获到的活性蛋白浓度为0.6 mg·mL^(-1)。成功构建了Pet28a(+)-DUF1943原核表达载体并优化了表达系统及蛋白复性方案,获得了DUF1943活性多肽,为进一步研究其生物功能及应用奠定了基础。

关键词：卵黄蛋白原 DUF1943基因原核表达纯化复性

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Effect of atmospheric parameters on fine particulate concentration in suburban Shanghai

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Particuology 2013年第1期11卷 48-54页

作者： Jian Yao Wei Liu Wangkun Chen guanghua Wang Youshi Zeng Yu huang Jun Lin Key Laboratory of Nuclear Analysis Techniques Shanghai Institute of Applied PhysicsChinese Academy of Sciences Department of Environment and Property Management Jin Wen University of Science & Technology

A study was conducted on the effect of atmospheric parameters, including temperature, wind speed, and relative humidity, on fine particulate mass concentrations measured in Jiading District of Shanghai, China, during the period from January 2009 to January 2010. A sensitivity analysis was applied to investigate the interaction between atmospheric parameters and particulate mass concentration. The experiment revealed that the concentration of particulates increased with particle size from 0.1 to 1.0 μm, and decreased with the increase of particle size from 1.0 to 2.5 μm. The effects of atmospheric parameters on fine mass concentrations were significantly particle size-dependent. The PM1.0-2.5 may come from the size increase of smaller particulates after moisture absorption, And the variation of concentrations of PM0.1-l.0 was mainly attributed to the accumulation of PM0.1. The ventilation index and dilution index were calcu- lated on the basis of data collected in December 2009. A correlation analysis indicated that there was a significant relation between these two indexes and the particulate concentration by examining the three particle size ranges, 0.0-0.1, 0.1-1.0, and 1,0-2.5 μm. The Spearman correlation coefficients that related the ventilation index to the concentration for the three particle size ranges were -0.45, -0.56 and -0.47, respectively, while the coefficients that related the dilution index to the concentration were -0.36, -0.42 and -0.45, respectively.

关键词： Sensitivity analysis Correlation analysis Size distribution Marginal variable

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成熟度对烟叶烘烤特性及烤后品质的影响

天津农业科学 2020年第4期26卷 60-63页

作者：李贤慧俞锞李峥黄广华顾俊杰付华覃善宇湖北省烟草公司恩施州公司湖北恩施445000 浙江中烟工业有限责任公司浙江杭州310002

为探究田间烟叶成熟度对烘烤特性以及烤后质量的影响,依据叶片落黄程度设置3个处理,通过色素含量、含水量和多酚氧化酶活性的测量判断各处理的烘烤特性,通过主要化学成分含量、外观质量和感官质量分析烤后烟叶质量。结果表明:随成熟度提... 详细信息

为探究田间烟叶成熟度对烘烤特性以及烤后质量的影响,依据叶片落黄程度设置3个处理,通过色素含量、含水量和多酚氧化酶活性的测量判断各处理的烘烤特性,通过主要化学成分含量、外观质量和感官质量分析烤后烟叶质量。结果表明:随成熟度提升,烟叶变黄时间缩短,水分散失较快,易烤性变好,但成熟度偏低或偏高均会影响多酚氧化酶活性的变化,导致其耐烤性变差;烘烤结束后,适熟烟叶外观质量和感官评吸质量的综合得分最高,主要化学成分较为协调。要适时采收以发挥和显露烟叶的质量潜势,提高烟叶的经济效益。

关键词：烤烟成熟度烘烤特性烟叶质量