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Performance Analysis of Plant Shells/PVC Composites under Corrosion and Aging Conditions

Journal of Renewable Materials 2024年第5期12卷 993-1006页

作者： Haoping Yao Xinyu zhong Chunxia He College of Engineering Nanjing Agricultural UniversityNanjing210031China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai200240China

To make full use of plant shellﬁbers(rice husk,walnut shell,chestnut shell),three kinds of wood-plastic com-posites of plant shellﬁbers and polyvinyl chloride(PVC)were prepared.X-ray diffraction analysis was carried out on three kinds of plant shellﬁbers to test their *** aging process of the composites was conducted under 2 different *** was artiﬁcial seawater immersion and xenon lamp irradiation,and the other one was deionized water spray and xenon lamp *** mechanical properties(tensile strength,ﬂexural strength,impact strength),changes in color,water absorption,Fourier transform infrared spectroscopy(FTIR),and microstructures of the composites before and after the two aging experiments were *** results showed that the chestnut shell had the highest crystallinity,which was 42%.The chestnut shell/PVC composites had the strongest interface bonding,the least internal defects,and the best general mechanical properties among the three *** tensile strength,bending strength and impact strength were 23.81 MPa,34.12 MPa,and 4.32 KJ·m^(-2),*** the two aging conditions,artiﬁcial seawater immersion and xenon lamp irradiation destroyed the quality of the combination of plant shellﬁbers and PVC,making the internal defects of the composites *** made the water absorption ability and changes in the color of the composites more obvious and led to a great decrease in the mechanical *** general mechanical properties of the chestnut shell/PVC composites were the best,but their water absorption ability changed more obviously.

关键词： Plant shellﬁbers polyvinyl chloride wood-plastic composites artiﬁcial seawater immersion deionized water spray xenon lamp irradiation

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Unbalanced private set intersection with linear communication complexity

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Science China(Information Sciences) 2024年第3期67卷 79-93页

作者： Quanyu ZHAO Bingbing JIANG Yuan ZHANG Heng WANG Yunlong MAO Sheng zhong Department of Computer Science and Technology Nanjing University Purple Mountain Lab

The private set intersection(PSI) protocol allows two parties holding a set of integers to compute the intersection of their sets without revealing any additional information to each other. The unbalanced PSI schemes consider a specific setting where a client holds a small set of the size n and a server holds a much larger set of the size m(n ■ m). The communication overhead of state-of-the-art balanced PSI schemes is O(m + n) and the unbalanced PSI schemes are O(nlogm). In this paper, we propose a novel secure unbalanced PSI protocol based on a hash proof system. The communication complexity of our protocol grows only linearly with the size of the small set. In other words, our protocol achieves communication overhead of O(n). We test the performance on a personal computer(PC) machine with a local area network(LAN)setting for the network. The experimental results demonstrate that the client only takes 2.01 s of online computation, 4.27 MB of round trip communication to intersect 1600 pieces of 32-bit integers with 220pieces of 32-bit integers with the security parameter λ = 512. Our protocol is efficient and can be applied to resource-constrained devices, such as cell phones.

关键词： unbalanced private set intersection Hash proof system linear communication complexity small set resource-constrained devices

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Predictability of the 7·20 extreme rainstorm in Zhengzhou in stochastic kinetic-energy backscatter ensembles

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Science China Earth Sciences 2024年第7期67卷 2226-2241页

作者： Min YANG Peilong YU Lifeng ZHANG Xiaobing PAN Quanjia zhong Yunying LI College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073China Key Laboratory of High Impact Weather(Special) China Meteorological AdministrationChangsha 410073China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Key Laboratory of Meteorological Disaster Ministry of Education/Joint International Research Laboratory of Climate and Environment ChangeNanjing University of Information Science and TechnologyNanjing 210044China Department of Ocean Science Hong Kong University of Science and TechnologyHong Kong 999077China

The scale-dependent predictability of the devastating 7·20 extreme rainstorm in Zhengzhou,China in 2021 was investigated via ensemble experiments,which were perturbed on different scales using the stochastic kinetic-energy backscatter(SKEB)scheme in the WRF model,with the innermost domain having a 3-km grid *** daily rainfall(RAIN24h)and the cloudburst during 1600-1700 LST(RAIN1h)were *** demonstrated that with larger perturbation scales,the ensemble spread for the rainfall maximum widens and rainfall forecasts become closer to the *** ensembles with mesoscale or convective-scale perturbations,RAIN1h loses predictability at scales smaller than 20 km and RAIN24h is predictable for all *** in ensembles with synoptic-scale perturbations,the largest scale of predictability loss extends to 60 km for both RAIN1h and ***,the average positional error in forecasting the heaviest rainfall for RAIN24h(RAIN1h)was 400 km(50-60)*** southerly low-level jet near Zhengzhou was assumed to be directly responsible for the forecast uncertainty of *** rapid intensification in low-level cyclonic vorticity,mid-level divergence,and upward motion concomitant with the jet dynamically facilitated the *** analysis of the divergent,rotational and vertical kinetic spectra and the corresponding error spectra showed that the error kinetic energy at smaller scales grows faster than that at larger scales and saturates more quickly in all ***-scale perturbations not only boost larger-scale error growth but are also conducive to error growth at all scales through a downscale cascade,which indicates that improving the accuracy of larger-scale flow forecast may discernibly contributes to the forecast of cloudburst intensity and position.

关键词： Stochastic kinetic-energy backscatter(SKEB) Extreme rainfall Ensemble forecast Predictability

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多功能光栅测量仪

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光学仪器 1989年第5期11卷 44-51页

作者：马品仲中国科学院南京天文仪器厂

MGMI系列测量仪器量程为0～100mm,分辨率为0.001mm,可对工件作绝对或比较测量,由于体积小有磁力座,故适用于计量室,车间和科研实验室。它广泛用于机械加工测量,闭环数控,数字显示,8、4、2、1码数字量输出和控制信号输出等系统中。

关键词：光栅测量仪计量栅仪

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Identification of key genes regulating the synthesis of quercetin derivatives in Rosa roxburghii through integrated transcriptomics and metabolomics

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Journal of Integrative Agriculture 2024年第3期23卷 876-887页

作者： Liyao Su Min Wu Tian Zhang Yan zhong Zongming(Max) Cheng State Key Laboratory of Crop Genetics and Germplasm Enhancement College of HorticultureNanjing Agricultural UniversityNanjing210095China

Rosa roxburghii fruit is rich in flavonoids, but little is known about their biosynthetic pathways. In this study, we employed transcriptomics and metabolomics to study changes related to the flavonoids at five different stages of R. roxburghii fruit development. Flavonoids and the genes related to their biosynthesis were found to undergo significant changes in abundance across different developmental stages, and numerous quercetin derivatives were identified. We found three gene expression modules that were significantly associated with the abundances of the different flavonoids in R. roxburghii and identified three structural UDP-glycosyltransferase genes directly involved in the synthesis of quercetin derivatives within these modules. In addition, we found that RrBEH4, RrLBD1 and RrPIF8could significantly increase the expression of downstream quercetin derivative biosynthesis genes. Taken together,these results provide new insights into the metabolism of flavonoids and the accumulation of quercetin derivatives in R. roxburghii.

关键词： Rosa roxburghii quercetin derivatives weighted gene co-expression network analysis transcription factor transcriptome metabolome

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离子液体修饰SBA-15及其负载RML的性质研究

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广东化工 2021年第5期48卷 35-37,49页

作者：陈炜麟钟南京广州检验检测认证集团有限公司广东广州511447 广东药科大学食品科学学院广东中山528458

目的:考察不同碳链长度的烷基化功能化离子液体修饰的SBA-15固定化酶的酶活、热稳定性和重复利用性等酶学性质。方法:通过引入含不同碳链长度咪唑环的烷基功能化离子液体对介孔材料SBA-15的硅羟基表面进行化学修饰。然后将所得新型固定... 详细信息

目的:考察不同碳链长度的烷基化功能化离子液体修饰的SBA-15固定化酶的酶活、热稳定性和重复利用性等酶学性质。方法:通过引入含不同碳链长度咪唑环的烷基功能化离子液体对介孔材料SBA-15的硅羟基表面进行化学修饰。然后将所得新型固定化载体用于米黑根毛霉脂肪酶(RML)的吸附固定,并以三乙酸甘油酯的水解为模型反应,。结果:结果表明,烷基化功能化离子液体修饰后的SBA-15固定化酶的比活力、热稳定性和重复利用性都得到了明显提高,其中RML@C8H17-IL-SBA-15的比活力最高(3422U/g),是RML@SBA-15的17倍;RML@C4H9-IL-SBA-15在磷酸盐缓冲液和无溶剂体系中显示出良好的热稳定性,在70℃加热4h后能维持其100%酶活;另外,RML@CH3-IL-SBA-15具有最好的重复利用性,重复使用5次后酶活没有损失。结论:因此,选择合适的离子液体能有效改善固定化酶的酶学性能。

关键词： RML 离子液体 SBA-15 修饰固定化

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负载金属氧化物WO_3/ZrO_2固体超强酸催化合成邻苯二甲酸二丁酯

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山东化工 2011年第11期40卷 13-15,23页

作者：张云良吴永忠南京化工职业技术学院江苏南京210048

研究了以采用超声浸渍法制备的负载金属氧化物固体超强酸WO3/ZrO2为催化剂,用邻苯二甲酸酐和正丁醇为原料合成邻苯二甲酸二丁酯,考察了反应条件对该反应的影响。结果表明,适宜的反应条件为:酐醇物质的量比1∶3.0,催化剂用量占反应物总... 详细信息

研究了以采用超声浸渍法制备的负载金属氧化物固体超强酸WO3/ZrO2为催化剂,用邻苯二甲酸酐和正丁醇为原料合成邻苯二甲酸二丁酯,考察了反应条件对该反应的影响。结果表明,适宜的反应条件为:酐醇物质的量比1∶3.0,催化剂用量占反应物总质量的2.0%,反应时间3 h,反应温度150℃。在此条件下酯收率达95.75%以上;经过后处理,产品纯度可达99.65%,其折光率(n2D0)为1.4896,与文献值一致;该催化剂不仅具有反应活性高,而且重复使用性好,可代替硫酸用于该类反应,具有较好的工业应用前景。

关键词：邻苯二甲酸二丁酯固体超强酸 WO3/ZrO2催化剂超声浸渍法

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Non-contact and full-field online monitoring of curing temperature during the in-situ heating process based on deep learning

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Advances in Manufacturing 2024年第1期12卷 167-176页

作者： Qiang-Qiang Liu Shu-Ting Liu Ying-Guang Li Xu Liu Xiao-zhong Hao College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing210016People’s Republic of China School of Mechanical and Power Engineering Nanjing Tech UniversityNanjing211816People’s Republic of China

Online monitoring of the curing temperature field is essential to improving the quality and efficiency of the manufacturing process of composite *** embedded sensor-based technologies have difficulty monitoring the full temperature field or have to introduce heterogeneous items that could have an undesired impact on the *** this paper,a non-contact,full-field monitoring method based on deep learning that predicts the internal temperature field of composite parts in real time using surface temperature measurements of auxiliary materials is *** the proposed method,an average temperature monitoring accuracy of 97%is achieved in various heating *** addition,this method also demonstrates satisfying feasibility when a stronger thermal barrier covers the *** method was experimentally validated during the self-resistance electric heating process,in which the monitoring accuracy reached 93.1%.This method can potentially be applied to automated manufacturing and process control in the composites industry.

关键词： Online monitoring Curing temperature field Deep learning(DL) In-situ heating

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Copper-based nanomaterials as peroxidase candidates for intelligent colorimetric detection and antibacterial applications

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Particuology 2024年第1期84卷 126-135页

作者： Yanyan Huang Huimin zhong Cong Jiang Jiahui Yang Jingwen Zhang Fei Zhao Chaoqun Liu College of Light Industry and Food Engineering Nanjing Forestry UniversityNanjing210037China College of Pharmacy Institutes of Environment and MedicineHenan UniversityKaifeng475004China

With natural polyphenol compound tannic acid(TA)as the ingredient,copper tannate(CuTA)nanolayer material was formed by self-assembly under the conditions of heating and copper *** ion and tannic acid could coordinate to form Cu-O-C structure which was similar to the Fe-N-C structure of natural heme *** addition,the obtained CuTA nanomaterial possessed excellent peroxidase-like catalytic activity and *** on this excellent enzymatic activity,CuTA nanomaterials could be used for colorimetric detection of hydrogen peroxide with a smartphone and decomposition of organic *** on the structural characteristics and catalytic activity,the copper tannate nanozymes could also serve as potential antibacterial reagents to effectively inhibit the growth of gram-negative and positive bacteria in a low hydrogen peroxide *** work may promote the exploration of novel peroxidase mimetics and broaden the applications of nanozymes.

关键词： Nanozyme Colorimetric detection Smartphone Antibacteria

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Numerical investigation of hydro-morphodynamic characteristics of a cascading failure of landslide dams

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Journal of Mountain Science 2024年第6期21卷 1868-1885页

作者： zhong Qiming CHEN Lingchun MEI Shengyao SHAN Yibo WU Hao ZHAO Kunpeng Department of Geotechnical Engineering Nanjing Hydraulic Research InstituteNanjing 210024China National Key Laboratory of Water Disaster Prevention Nanjing 210098China Key Laboratory of Reservoir and Dam Safety of the Ministry of Water Resources Nanjing 210029China

A cascading failure of landslide dams caused by strong earthquakes or torrential rains in mountainous river valleys can pose great threats to people’s lives,properties,and *** this study,based on the three-dimensional Reynoldsaveraged Navier-Stokes equations(RANS),the renormalization group(RNG)k-εturbulence model,suspended and bed load transport equations,and the instability discriminant formula of dam breach side slope,and the explicit finite volume method(FVM),a detailed numerical simulation model for calculating the hydro-morphodynamic characteristics of cascading dam breach process has been *** developed numerical model can simulate the breach hydrograph and the dam breach morphology evolution during the cascading failure process of landslide dams.A model test of the breaches of two cascading landslide dams has been used as the validation *** comparison of the calculated and measured results indicates that the breach hydrograph and the breach morphology evolution process of the upstream and downstream dams are generally consistent with each other,and the relative errors of the key breaching parameters,i.e.,the peak breach flow and the time to peak of each dam,are less than±5%.Further,the comparison of the breach hydrographs of the upstream and downstream dams shows that there is an amplification effect of the breach flood on the cascading landslide dam *** key parameters,i.e.,the distance between the upstream and the downstream dams,the river channel slope,and the downstream dam height,have been used to study the flood amplification *** parameter sensitivity analyses show that the peak breach flow at the downstream dam decreases with increasing distance between the upstream and the downstream dams,and the downstream dam ***,the peak breach flow at the downstream dam first increases and then decreases with steepening of the river channel *** the flood caused by the upstream dam failure flows to the

关键词： Cascading landslide dams Cascading dam failure process Detailed numerical simulation model Flood amplification effect Parameter sensitivity analyses

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