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Dynamics modeling and pressure control of composites tape winding system based on LQSMC

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Chinese Journal of Aeronautics 2020年第2期33卷 740-748页

作者： Qi HONG Yaoyao SHI danni LU The Key Laboratory of Contemporary Design and Integrated Manufacturing Technology Ministry of Education Northwestern Polytechnical UniversityXi’an 710072China

Pressure fluctuations during the composite fiber winding process seriously affect the produces compactness strength,fatigue resistance,stress uniformity,and resin *** accuracy of pressure control systems is affected by nonlinear disturbances,such as friction,parameter perturbation,and measurement noise.A robust control algorithm based on linear quadratic optimal control and sliding mode control(LQSMC)is proposed to overcome these *** method is based on the system state space expression and linear quadratic optimal *** state space model of the system is improved by using a Kalman filter and control input for state estimation,and a new sliding surface equation is *** ameliorated control algorithm exhibits good performance and can effectively suppress sliding mode control(SMC)*** and experimental results show that LQSMC offers high control precision,much stronger antiinterference,and robustness,which can effectively improve the positioning and tracking accuracy of a pressure control system compared with linear quadratic optimal control(LQC).The winding pressure control precision is improved by 45%to 50%.The results show that the porosity of composite fiber tape winding products decreased thanks to our method.

关键词： Composites tape winding Dynamics modeling Kalman filter LQSMC Pressure control

Achieving integrated capture and reduction of CO_(2):A promising electrocatalyst

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Journal of Materials Science & Technology 2023年第34期165卷 235-243页

作者： Mengjie Liu Longsheng Zhan Yuchao Wang Xin Zhao Jiao Wu danni Deng Jiabi Jiang Xinran zheng Yongpeng Lei State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China

To realize the goal of carbon peaking and carbon neutrality,CO_(2) capture and utilization technology is becoming increasingly ***,the low efficiency and complex processes limit its large-scale *** utilization technology of CO_(2),electrochemical CO_(2) reduction reaction(CO_(2)RR)has attracted interest,attributing to the use of clean energy and the final product of value-added *** construction of catalysts with integrated CO_(2) capture and reduction ability is expected to bridge the gap between CO_(2) capture and conversion,achieving the direct utilization of flue gas,reducing costs,and simplifying ***` this in mind,we give this review to introduce the problems of lowconcentration CO_(2)RR and the significance of coupled CO_(2) capture/conversion electrocatalysts in addressing the emission of industrial flue gas ***,the regulation strategies,including functional group modification,co-catalytic effect,and catalysts-impurities interaction,which affected the CO_(2) capture and electroreduction capacity towards catalysts were summarized and ***,the challenges and perspectives about the design for linked CO_(2) capture/conversion processes were *** review will provide new insight into the building of multifunctional catalysts for CO_(2) conversion.

关键词： CO_(2)capture and electroreduction Electrocatalyst Functional group Co-catalytic effect Catalysts-impurities interaction

Predicting the degradation behavior of magnesium alloys with a diffusion-based theoretical model and in vitro corrosion testing

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Journal of Materials Science & Technology 2019年第7期35卷 1393-1402页

作者： Zhenquan Shen Ming Zhao Dong Bian danni Shen Xiaochen Zhou Jianing Liu Yang Liu Hui Guo Yufeng zheng Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijing 100871China 9955 Buffalo Speedway #4308 HoustonTXUSA Academy for Advanced Interdisciplinary Studies Peking UniversityBeijing 100871China

Magnesium alloys have shown great potential for their use in the medical device field, due to the promising biodegradability. However, it remains a challenge to characterize the degradation behavior of the Mg alloys in a quantitative manner. As such, controlling the degradation rate of the Mg alloys as per our needs is still hard, which greatly limits the practical application of the Mg alloys as a degradable *** paper discussed a numerical model developed based on the diffusion theory, which can capture the experimental degradation behavior of the Mg alloys precisely. The numerical model is then implemented into a finite element scheme, where the model is calibrated with the data from our previous studies on the corrosion of the as-cast Mg-1 Ca and the as-rolled Mg-3 Ge binary alloys. The degradation behavior of a pin implant is predicted using the calibrated model to demonstrate the model’s capability. A standard flow is provided in a practical framework for obtaining the degradation behavior of any biomedical Mg alloys. This methodology was further verified via the comparison with enormous available experimental results. Lastly, the material parameters defined in this model were provided as a new kind of material property.

关键词： Degradation behavior Diffusion model Finite element simulation Magnesium alloy Corrosion Medical device

Oncolytic virotherapy:basic principles,recent advances and future directions

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Signal Transduction and Targeted Therapy 2023年第5期8卷 2180-2208页

作者： danni Lin Yinan Shen Tingbo Liang Department of Hepatobiliary and Pancreatic Surgery The First Affiliated HospitalZhejiang University School of MedicineHangzhouZhejiangChina Zhejiang Provincial Key Laboratory of Pancreatic Disease The First Affiliated HospitalZhejiang University School of MedicineHangzhouZhejiangChina Zhejiang Clinical Research Center of Hepatobiliary and Pancreatic Diseases HangzhouZhejiangChina The Innovation Center for the Study of Pancreatic Diseases of Zhejiang Province HangzhouZhejiangChina Cancer Center Zhejiang UniversityHangzhouZhejiangChina

Oncolytic viruses(OVs)have attracted growing awareness in the twenty-first century,as they are generally considered to have direct oncolysis and cancer immune *** the progress in genetic engineering technology,OVs have been adopted as versatile platforms for developing novel antitumor strategies,used alone or in combination with other *** studies have yielded eye-catching results that delineate the promising clinical outcomes that OVs would bring about in the *** this review,we summarized the basic principles of OVs in terms of their classifications,as well as the recent advances in OV-modification strategies based on their characteristics,biofunctions,and cancer *** OVs are expected to be designed as“qualified soldiers”first by improving target fidelity and safety,and then equipped with“cold weapons”for a proper cytocidal effect,“hot weapons”capable of activating cancer immunotherapy,or“auxiliary weapons”by harnessing tactics such as anti-angiogenesis,reversed metabolic reprogramming and decomposing extracellular matrix around *** with other cancer therapeutic agents have also been elaborated to show encouraging antitumor *** results from clinical trials using OV as a treatment congruously suggested its significance in future application directions and challenges in developing OVs as novel weapons for tactical decisions in cancer treatment.

关键词： directions reversed summarized

Crystallinity engineering of Au nanoparticles on graphene for in situ SERS monitoring of Fenton-like reaction

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Chinese Chemical Letters 2022年第3期33卷 1263-1266页

作者： danni Guo Lixia Zhao Hui Zhang State Key Laboratory of Environmental Chemistry and Eco-toxicology Research Center for Eco-environmental SciencesChinese Academy of SciencesBeijing 100085China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Water Environment Simulation School of EnvironmentBeijing Normal UniversityBeijing 100875China

Fabrication of multifunctional nanoplatform to in situ monitor Fenton reaction is of vital importance to probe the underlying reaction process and design high-performance catalyst. Herein, a hybrid catalyst comprising of single-crystalline Au nanoparticles (SC Au NPs) on reduced graphene oxide (RGO) sheet was prepared, which not only exhibited an excellent ^(1)O_(2) mediated Fenton-like catalytic activity in promoting rhodamine 6G (R6G) degradation by activating H_(2)O_(2), but also displayed a sensitive surface-enhanced Raman spectroscopy (SERS) detection performance to R6G with a linear response range from 1.0×10^(-8) mol/L to 1.0×10^(-5) mol/L thus providing a powerful and versatile nanoplatform for in situ SERS monitoring Fenton-like catalytic reaction. The integration of catalytic and SERS activities into a single nanostructure are expected to provide great potentials for practical applications in environmental catalysis.

关键词： Au nanoparticle Crystallinity engineering Fenton-like reaction SERS monitoring Environmental remediation

男性强直性脊柱炎患者骨密度与血尿酸水平相关性研究

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中国骨质疏松杂志 2020年第4期26卷 502-506页

作者：孙文婷朱峰郑丹妮李艳萍杨爱娟胡丽芳穆闻君张楠陶庆文阎小萍孔维萍北京中医药大学北京100029 中日友好医院中医风湿病科北京100029 免疫炎性疾病北京市重点实验室北京100029

目的分析强直性脊柱炎(ankylosing spondylitis,AS)男性患者骨密度(bone mineral density,BMD)与血尿酸(serum uric acid,SUA)的相关关系。方法回顾性分析2013年9月到2018年9月在中日友好医院确诊的143名男性AS患者,按腰椎、股骨颈、股... 详细信息

目的分析强直性脊柱炎(ankylosing spondylitis,AS)男性患者骨密度(bone mineral density,BMD)与血尿酸(serum uric acid,SUA)的相关关系。方法回顾性分析2013年9月到2018年9月在中日友好医院确诊的143名男性AS患者,按腰椎、股骨颈、股骨粗隆BMD水平各分为正常骨量组和骨量减少组。比较两组间患者临床基本资料、疾病活动程度指标等的差异;使用多元回归分析评估SUA水平与男性AS患者各部位BMD的关系;使用Logistic回归模型预测SUA与各部位BMD之间的风险概率;构建列线图预测男性AS患者腰椎及股骨粗隆发生骨量减少的风险。结果两组间比较结果显示,身高、腰椎、股骨颈、股骨粗隆BMD比较差异均有统计学意义(均P<0.05)。多元线性回归分析提示SUA水平与腰椎、股骨粗隆的BMD呈正相关。Logistic回归分析结果提示,SUA每降低78 mmol/L发生腰椎和股骨粗隆骨量减少的风险分别升高18%和17%。通过构建的列线图可预测男性AS患者发生腰椎及股骨粗隆骨量减少的风险。结论SUA水平低可能会增加男性AS患者腰椎和股骨粗隆骨量减少的风险,SUA具有反映男性AS患者骨量减少风险的潜力。

关键词：强直性脊柱炎血尿酸骨密度

Effects of acid deposition control in China:a review based on responses of subtropical forests

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Frontiers of Environmental Science & Engineering 2024年第6期18卷 115-126页

作者： danni Xie Xiaodong Ge Lei Duan Jan Mulder School of Land Engineering Chang’an UniversityXi’an 710064China State Key Laboratory of Environmental Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Beijing 100084China Faculty of Environmental Sciences and Natural Resource Management Norwegian University of Life SciencesBox 5003NO-1432ÅsNorway

For many decades,acid deposition used to pose a significant regional air pollution challenge in *** substantial emission control of anthropogenically derived sulfur and nitrogen containing gasses,both sulfur and nitrogen deposition,as well as the acid rain-affected area,have significantly decreased compared to their peak ***,particularly in the humid subtropics,are sensitive to acid deposition,as evidenced by soil acidification,sulfate and nitrate leaching in stream water,and elevated soil nitrous oxide *** in the total deposition of sulfur and nitrogen,caused a significant decline in sulfate and nitrate leaching from subtropical forest and subsequently in sulfate and nitrate concentrations in stream water,although there was about a 5-year *** delay may be attributed to the desorption of accumulated sulfate and continued elevated mineralization of accumulated nitrogen *** of nitrous oxide,a potent greenhouse gas,also declined in nitrogen-saturated subtropical forest soils,as soil water nitrate concentration ***,subtropical forests in China suffering from elevated acid deposition have begun to ***,the current levels of sulfur and nitrogen deposition continue to exceed the critical loads,i.e.,the assigned threshold levels in accordance with emission control policies,in more than 10%of the country’s land area,respectively,indicating remaining risks of acidification and ***,further emission reductions are urgently needed,also because they will help achieving goals related to air quality and nitrous oxide emissions.

关键词： Acidification Critical load Nitrous oxide Surface water chemistry Recovery

Interfacial engineering of SnO_(2)/Bi_(2)O_(2)CO_(3)heterojunction on heteroatoms-doped carbon for high-performance CO_(2)electroreduction to formate

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Nano Research 2023年第2期16卷 2278-2285页

作者： danni Wang Tingting Sun Lianbin Xu Lei Gong Baotong Chen Pianpian Zhang Tianyu zheng Qingmei Xu Houhe Pan Yuexing Zhang Jianzhuang Jiang Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline MaterialsDepartment of Chemistry and Chemical EngineeringSchool of Chemistry and Biological EngineeringUniversity of Science and Technology BeijingBeijing 100083China State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China College of Chemistry and Chemical Engineering Dezhou UniversityDezhou 253023China

Electrochemical CO_(2)reduction is a viable,economical,and sustainable method to transform atmospheric CO_(2)into carbon-based fuels and effectively reduce climate change and the energy *** robust catalysts through interface engineering is significant for electrocatalytic CO_(2)reduction(ECR)but remains a grand ***,SnO2/Bi_(2)O_(2)CO_(3)heterojunction on N,S-codoped-carbon(SnO_(2)/BOC@NSC)with efficient ECR performance was firstly constructed by a facile synthetic *** the SnO_(2)/BOC@NSC was utilized in ECR,it exhibits a large formic acid(HCOOH)partial current density(JHCOOH)of 86.7 mA·cm^(−2)at−1.2 V versus reversible hydrogen electrode(RHE)and maximum Faradaic efficiency(FE)of HCOOH(90.75%at−1.2 V versus RHE),***,the FEHCOOH of SnO_(2)/BOC@NSC is higher than 90%in the flow cell and the JHCOOH of SnO_(2)/BOC@NSC can achieve 200 mA·cm^(−2)at−0.8 V versus RHE to meet the requirements of industrialization *** comparative experimental analysis and in-situ X-ray absorption fine structure reveal that the excellent ECR performance can be ascribed to the synergistic effect of SnO_(2)/BOC heterojunction,which enhances the activation of CO_(2)molecules and improves electron *** work provides an efficient SnO_(2)-based heterojunction catalyst for effective formate production and offers a novel approach for the construction of new types of metal oxide heterostructures for other catalytic applications.

关键词： heterojunction charge transfer electrochemical CO_(2)reduction flow cell in-situ X-ray absorption fine structure

Optimal Error Estimates of the Semi-Discrete Local Discontinuous Galerkin Method and Exponential Time Differencing Schemes for the Thin Film Epitaxy Problem without Slope Selection

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Advances in Applied Mathematics and Mechanics 2023年第3期15卷 545-567页

作者： danni Zhang Ruihan Guo School of Mathematics and Statistics Zhengzhou UniversityZhengzhouHenan 450001China

In this paper,we prove the optimal error estimates in L2 norm of the semidiscrete local discontinuous Galerkin(LDG)method for the thin film epitaxy problem without slope *** relax the severe time step restriction of explicit time marching methods,we employ a class of exponential time differencing(ETD)schemes for time integration,which is based on a linear convex splitting *** experiments of the accuracy and long time simulations are given to show the efficiency and capability of the proposed numerical schemes.

关键词： Local discontinuous Galerkin method thin film epitaxy problem error estimates exponential time differencing long time simulation