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智慧城市建设对中国市域经济韧性的影响

经济地理 2024年第7期44卷 135-143,185页

作者：刘宇轩王宇航邓文逸湘潭大学商学院中国湖南湘潭411105 湖南工商大学会计学院中国湖南长沙410205

文章基于2008—2021年中国251个地级及以上城市的市域面板数据,在考虑智慧城市试点选择性偏误的条件下,利用渐进双重差分模型检验了智慧城市建设对市域经济韧性的影响及其作用机制。研究发现:①智慧城市建设能够通过提升市场活力,促进... 详细信息

文章基于2008—2021年中国251个地级及以上城市的市域面板数据,在考虑智慧城市试点选择性偏误的条件下,利用渐进双重差分模型检验了智慧城市建设对市域经济韧性的影响及其作用机制。研究发现:①智慧城市建设能够通过提升市场活力,促进科技创新和推动城市数字化转型等路径提升市域经济韧性水平,且该结果在剔除各类干扰样本和更换多种回归方法的条件下依然稳健。②异质性检验表明,智慧城市建设能够显著提升人口规模较小、金融供给水平较低和外贸依赖度适中城市的市域经济韧性水平。该结论为继续推进中国智慧城市建设和提升市域经济韧性提供了经验支持。

关键词：智慧城市建设市域经济韧性市场活力科技创新数字化转型金融供给外贸依存度

Experimental study on agitated drying characteristics of sewage sludge under the effects of different additive agents

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Journal of Environmental Sciences 2014年第7期26卷 1523-1529页

作者： wenyi deng Yaxin Su School of Environmental Science and Engineering Donghua University

Drying experiments of dewatered sewage sludge（DSS） were conducted on a agitated paddle dryer, and the effects of additive agents, i.e., CaO, pulverized coal（PC）, heavy oil（HO）, and dried sludge（＂DS＂ through back mixing） on the agitated drying characteristics of DSS were investigated. The results indicated that CaO can significantly increase the drying rate of *** drying rate at CaO/DSS（mass ratio） = 1/100 was 135% higher than that of CaO/DSS = *** coal has no obvious effect on drying rate, but the increase of PC/DSS can promote breaking up of sludge lump. Heavy oil was found to be slightly effective in improving the drying rate of DSS in the examined experimental range of HO/DSS = 0-1/20. It is also found that HO can reduce the torque of the dryer shaft, due to its lubrication effect. Back mixing of DS was found to be effective in alleviating the unfavorable effect of the lumpy phase by improving the mixing effect of the paddle dryer. There was a marked increase of drying rate with an increase of the DS/DSS in the experimental range of DS/DSS = 0-1/3.

关键词： Sewage sludge Drying Additive agent

Recent advances in preparation of metallic superhydrophobic surface by chemical etching and its applications

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Chinese Journal of Chemical Engineering 2023年第9期61卷 221-236页

作者： Shitong Zhu wenyi deng Yaxin Su College of Environmental Science and Engineering Donghua UniversityShanghai 201620China

In the past few decades,inspired by the superhydrophobic surfaces(SHPS)of animals and plants such as lotus leaves,rose petals,legs of water striders,and wings of butterflies,preparing metal materials with metallic SHPS(MSHPS)have attracted great research interest,due to the great prospect in practical *** obtain SHPS on conventional metal materials,it is necessary to construct rough surface,followed by modification with low surface energy *** this paper,the action mechanism and the current research status of MSHPS were reviewed through the following ***,the model of wetting theory was presented,and then the progress in MSHPS preparation through chemical etching method was ***,the applications of MSHPS in self-cleaning,anti-icing,corrosion resistance,drag reduction,oil-water separation,and other aspects were ***,the challenges encountered in the present application of MSHPS were summarized,and the future research interests were discussed.

关键词： Metal Superhydrophobic surface Chemical etching Low adhesion Self-cleaning

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活性炭联合正弦波电场促进污泥脱水

当代化工研究 2024年第2期 177-179页

作者：屈园浩邓文义东华大学环境科学与工程学院上海201620

利用活性炭联合正弦波电场促进污泥脱水,通过对泥饼电流、温度及泥饼、滤液的性质分析探究活性炭对污泥脱水的促进机理。结果表明,活性炭可以提升污泥导电性,增强污泥中的电化学反应,从而降低了泥饼含水率。在占空比为100%,投加量为5%... 详细信息

利用活性炭联合正弦波电场促进污泥脱水,通过对泥饼电流、温度及泥饼、滤液的性质分析探究活性炭对污泥脱水的促进机理。结果表明,活性炭可以提升污泥导电性,增强污泥中的电化学反应,从而降低了泥饼含水率。在占空比为100%,投加量为5%污泥干重时,泥饼含水率为43%;活性炭可以吸附滤液中有机物组分,相比未投加,投加5%活性炭的总有机碳值降低了1.708g/L,降低了滤液处理成本。

关键词：污泥脱水活性炭正弦波滤液

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不锈钢超疏水材料在污泥干化尾气的换热研究

当代化工研究 2024年第2期 46-48页

作者：朱世通邓文义东华大学环境科学与工程学院上海201620

本文采用溶液刻蚀法使原样不锈钢的接触角由76.5°增加到了158.3°,实现了由亲水向超疏水转变。利用这种方法制备了超疏水不锈钢管,并将它应用于换热器。利用含粉尘湿空气模拟污泥干化的尾气,研究了换热器在不同湿空气流速下的换热系数... 详细信息

本文采用溶液刻蚀法使原样不锈钢的接触角由76.5°增加到了158.3°,实现了由亲水向超疏水转变。利用这种方法制备了超疏水不锈钢管,并将它应用于换热器。利用含粉尘湿空气模拟污泥干化的尾气,研究了换热器在不同湿空气流速下的换热系数的变化情况。研究发现在含粉尘的湿气体工况下,超疏水材料具有优异的换热增强效果。超疏水不锈钢管的换热系数比普通管最大提高了约31.1%,在气体流速为3.75~5.75m/s时,超疏水不锈钢管的换热系数平均比普通管提高了23.9%。

关键词：超疏水自清洁尾气换热

Moisture distribution in sludges based on different testing methods

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Journal of Environmental Sciences 2011年第5期23卷 875-880页

作者： wenyi deng Xiaodong Li Jianhua Yan Fei Wang Yong Chi Kefa Cen School of Environmental Science and Engineering Donghua University Shanghai 201620 China. E-mail: dengwy@*** State Key Laboratory of Clean Energy Utilization Institute for Thermal Power Engineering Zhejiang University Hangzhou 310027 China

Moisture distributions in municipal sewage sludge, printing and dyeing sludge and paper mill sludge were experimentally studied based on four different methods, i.e., drying test, thermogravimetric-differential thermal analysis （TG-DTA） test, thermogravimetric- differential scanning calorimetry （TG-DSC） test and water activity test. The results indicated that the moistures in the mechanically dewatered sludges were interstitial water, surface water and bound water. The interstitial water accounted for more than 50% wet basis （wb） of the total moisture content. The bond strength of sludge moisture increased with decreasing moisture content, especially when the moisture content was lower than 50% wb. Furthermore, the comparison among the four different testing methods was presented. The drying test was advantaged by its ability to quantify free water, interstitial water, surface water and bound water; while TG-DSC test, TG-DTA test and water activity test were capable of determining the bond strength of moisture in sludge. It was found that the results from TG-DSC and TG-DTA test are more persuasive than water activity test.

关键词： moisture distribution sludge bond strength

WRAP53与甲状腺乳头状癌患者临床病理特征及预后的关系

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现代肿瘤医学 2024年第1期32卷 60-64页

作者：戢楠楠邓文艺陈秀秀曾越灿海南医学院第二附属医院放疗科海南海口570100 海南医学院第二附属医院临床医学研究所海南海口570100 海南医学院第二附属医院乳甲外科海南海口570100

目的:探讨端粒酶新核心亚单位(WD40-encoding RNA antisense to p53,WRAP53)又名端粒酶卡哈尔体蛋白1(telomerase cajal body protein 1,TCAB1)在甲状腺乳头状癌(papillary thyroid carcinoma,PTC)组织中的表达,分析其与患者临床病理特征及预后的关系。方法:收集28例PTC患者的癌及癌周正常新鲜组织标本,应用实时荧光定量聚合酶链反应法(quantitative real-time polymerase chain reaction,qPR-PCR)及免疫组织化学法分别检测WRAP53 mRNA及蛋白在PTC及周围正常组织中的表达,收集117例PTC术后患者的临床数据及对应的癌组织的石蜡切片进行免疫组化检测,分析其蛋白表达水平与甲状腺乳头状癌患者的临床病理特征的相关性,最后应用蛋白质表达图谱(The Human Protein Atlas,HPA)数据库探究WRAP53与PTC预后之间的关系。结果:qPR-PCR及免疫组化结果提示WRAP53在PTC中较正常组织高表达(P<0.05)。与WRAP53低表达的PTC患者相比,WRAP53高表达的PTC患者肿瘤直径更长,更易出现淋巴结转移(P<0.05)。HPA数据库显示WRAP53高表达的PTC患者的生存率差于WRAP53低表达的PTC患者(P=0.041)。结论:通过本次研究表明,WRAP53在PTC组织中表达较周围正常组织升高,且其高表达与PTC增殖、淋巴结转移及不良预后相关。WRAP53可能是治疗PTC新的潜在靶点。

关键词：甲状腺乳头状癌 WRAP53 TCAB1 临床病理预后

Emission characteristics of dioxins,furans and polycyclic aromatic hydrocarbons during fluidized-bed combustion of sewage sludge

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Journal of Environmental Sciences 2009年第12期21卷 1747-1752页

作者： deng wenyi, YAN Jianhua, LI Xiaodong, WANG Fei, CHI Yong, LU ShengyongState Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China. State Key Laboratory of Clean Energy Utilization Institute for Thermal Power Engineering Zhejiang University Hangzhou 310027 China

Pre-dried sewage sludge with high sulfur content was combusted in an electrically heated lab-scale fluidized-bed incinerator. The emission characteristics of polychlorinated dibenzo-p-dioxins （PCDDs）, polychlorinated dibenzofurans （PCDFs） and polycyclic aromatic hydrocarbons （PAHs） were studied. Coal and calcium oxide （CaO） were added during the sewage sludge combustion tests to optimize combustion conditions and control SO2 emission. The results indicated that the flue gases emitted during mono-combustion of sewage sludge were characterized by relatively high concentrations of SO2, NOx and organic pollutants, due to the high sulfur, nitrogen, and volatile matter content of sewage sludge. The total 16 USEPA priority PAHs and 2,3,7,8-substituted PCDD/Fs produced from sewage sludge combustion were found to be 106.14 μg/m^3 and 8955.93 pg/m^3 in the flue gas, respectively. In the case of cocombustion with coal （msludge/mcoal =1：1）, the 16 PAHs and 2,3,7,8-substituted PCDD/Fs concentrations were markedly lower than those found during mono-combustion of sewage sludge. During co-combustion, a suppressant effect of CaO on PCDD/Fs formation was observed.

关键词： co-combustion PCDD/Fs polycyclic aromatic hydrocarbons (PAHs) sewage sludge

基于临床和CT影像学特征的胰腺囊性病变进展预测模型的建立及验证

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中华胰腺病杂志 2024年第1期24卷 23-28页

作者：邓文祎谢飞扬毛丽李秀丽孙照勇徐凯朱亮金征宇李骁薛华丹中国医学科学院北京协和医学院、北京协和医院放射科北京100730 深睿医疗人工智能研究院北京100080 南京大学医学院附属金陵医院(东部战区总医院)放射诊断科南京210002

目的构建基于临床及CT影像学特征的胰腺囊性病变(PCLs)进展预测机器学习模型,并在内、外部测试集上评估其预测效能。方法回顾性收集2014年7月至2022年12月间北京协和医院行腹部薄层增强CT扫描的177例患者、200个PCLs病灶的基线临床和影... 详细信息

目的构建基于临床及CT影像学特征的胰腺囊性病变(PCLs)进展预测机器学习模型,并在内、外部测试集上评估其预测效能。方法回顾性收集2014年7月至2022年12月间北京协和医院行腹部薄层增强CT扫描的177例患者、200个PCLs病灶的基线临床和影像学资料,根据随访3年间PCLs病灶是否出现欧洲PCLs研究小组指南规定的手术征象,将其分为进展组和无进展组。以3∶1的比例将200个PCLs病灶随机分为训练集(150个)和内部测试集(50个);以2011年10月至2020年5月间南京大学医学院附属金陵医院行腹部薄层增强CT扫描的14例患者、15个PCLs病灶作为外部测试集。记录患者的临床及CT影像学特征,采用多种特征选择方法、多种机器学习模型进行组合,并基于10折交叉验证法筛选最优机器学习模型。绘制各模型的受试者工作特征曲线(ROC),计算曲线下面积(AUC),取AUC值最高的模型作为最优模型。在测试集上计算AUC值、灵敏度、特异度和准确度,评估模型的预测效能。使用置换重要性评估最优模型特征的重要程度。建立最优模型的校准曲线,采用Hosmer-Lemeshow检验评估模型的临床适用性。结果训练集和内部测试集的进展组与无进展组在胰腺炎史、病灶大小、主胰管管径、主胰管扩张、囊壁增厚、分隔存在、分隔增厚间的差异及内部测试集的两组在性别、病灶钙化和胰腺萎缩间的差异均有统计学意义(P值均<0.05)。外部测试集的进展组与无进展组在病灶大小和胰管扩张间的差异均有统计学意义(P值均<0.05)。基于F检验所选出的胰腺炎史、病灶大小、囊壁增厚、主胰管扩张、主胰管管径5个特征建立的支持向量机模型在交叉验证过程中取得了最高AUC值(0.899)。该模型在内部测试集中对PCLs进展预测的AUC值为0.909,灵敏度为82.4%,特异度为72.7%,准确度为76.0%,在外部测试集中分别为0.944、100%、77.8%和86.7%。校准曲线显示,模型的预测概率与实际PCLs进展概率基本相当。Hosmer-Lemeshow拟合优度检验显示,模型对测试集PCLs进展真实情况的拟合较好。结论基于临床及CT影像学特征构建的支持向量机模型能够帮助医师预测3年内随访PCLs的进展情况,从而帮助临床高效管理患者,合理分配医疗资源。

关键词：胰腺囊性肿瘤机器学习疾病进展计算机体层成像