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VIBRATION SUPPRESSION OF CANTILEVER LAMINATED COMPOSITE PLATE WITH NONLINEAR GIANT MAGNETOSTRICTIVE MATERIAL LAYERS

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Acta Mechanica Solida Sinica 2015年第1期28卷 50-61页

作者： yongfei zhang Haomiao Zhou Youhe Zhou Key Laboratory of Mechanics on Disaster and Environment in Western China the Ministry of Education of China Lanzhou University Department of Mechanics and Engineering Sciences College of Civil Engineering and MechanicsLanzhou University College of Information Engineering China Jiliang University

In this paper, a nonlinear and coupled constitutive model for giant magnetostrictive materials （GMM） is employed to predict the active vibration suppression process of cantilever laminated composite plate with GMM layers. The nonlinear and coupled constitutive model has great advantages in demonstrating the inherent and complicated nonlinearities of GMM in re- sponse to applied magnetic field under variable bias conditions （pre-stress and bias magnetic field）. The Hamilton principle is used to derive the nonlinear and coupled governing differential equation for a cantilever laminated composite plate with GMM layers. The derived equation is handled by the finite element method （FEM） in space domain, and solved with Newmark method and an iteration process in time domain. The numerical simulation results indicate that the proposed active control system by embedding GMM layers in cantilever laminated composite plate can efficiently suppress vibrations under variable bias conditions. The effects of embedded placement of GMM layers and control gain on vibration suppression are discussed respectively in detail.

关键词： giant magnetostrictive materials nonlinear constitutive model active vibration suppression cantilever laminated composite plate

Formation and evolution of Precambrian continental crust in South China

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Chinese Science Bulletin 2007年第A1期52卷 1-12页

作者： ZHENG yongfei zhang ShaoBing Key Laboratory of Crust-Mantle Materials and Environments Chinese Academy of Sciences School of Earth and Space SciencesUniversity of Science and Technology of China Hefei 230026 China

有～ 3 .8 Ga 和 Hf 模型的 U-Pb 年龄的锆石的出现在华南～ 4 .0 Ga 变老在华南建议地府的外壳的残余的存在。而且，有象 4.1 Ga 一样旧的 U-Pb 年龄的由岩屑形成的锆石在西藏被发现了。这是到目前为止在中国报导的最旧的锆石。这些结... 详细信息

有～ 3 .8 Ga 和 Hf 模型的 U-Pb 年龄的锆石的出现在华南～ 4 .0 Ga 变老在华南建议地府的外壳的残余的存在。而且，有象 4.1 Ga 一样旧的 U-Pb 年龄的由岩屑形成的锆石在西藏被发现了。这是到目前为止在中国报导的最旧的锆石。这些结果暗示那个大陆人外壳比以前想在是更普遍的晚地府，但是它的多数高效地被重做进太古代的大陆人外壳。根据可得到的锆石 U-Pb 年龄和 Hf 同位素数据，看来，在华南的大陆人外壳的生长后来开始了早太古代，但是著名计算机生产厂商通过重做的有能力的 cratonic 块没发生直到 Paleoproterozoic。自从 Eoarchean，因此，板 tectonics 的某形式的操作可以发生在中国大陆。华南 craton 的起始的破坏被集中的 magmatic 活动在 Neoproterozoic 期间与超级大陆 Rodinia 的集会和决裂联合引起。然而，大多数太古代并且在华南的 Paleoproterozoic 外壳的材料不作为表面岩石发生，但是作为分散的外壳的残余存在。不过， Neoproterozoic magmatism 的出现仍然是签名把华南与诺思中国区分开来。

关键词：前寒武纪大陆外壳中国

Hypoxic tumor microenvironment:Destroyer of natural killer cell function

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Chinese Journal of Cancer Research 2024年第2期36卷 138-150页

作者： yongfei zhang Feifei Guo Yufeng Wang Cancer Center the First Hospital of Jilin UniversityChangchun 130021China

In recent years, immunotherapy has made remarkable progress in treating certain tumors and hematological malignancies. However, the efficacy of natural killer(NK) cells, which are an important subset of innate lymphocytes used in anticancer immunotherapy, remains limited. Hypoxia, a critical characteristic of the tumor microenvironment(TME), is involved in tumor development and resistance to radiotherapy, chemotherapy, and immunotherapy. Moreover, hypoxia contributes to the impairment of NK cell function and may be a significant factor that limits their therapeutic effects. Targeted hypoxia therapy has emerged as a promising research area for enhancing the efficacy of NK cell therapy. Therefore, understanding how the hypoxic TME influences NK cell function is crucial for improving antitumor treatment outcomes.

关键词： Hypoxia immunotherapy NK cell tumor microenvironment

Polybrominated diphenyl ethers in soil from three typical industrial areas in Beijing, China

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Journal of Environmental Sciences 2013年第12期25卷 2443-2450页

作者： yongfei zhang Shan Fu Xinchun Liu Zheng Li Yuan Dong State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of Sciences University of Chinese Academy of Sciences

Areas containing industrial facilities belonging to three different typical industries that may cause pollution by polybrominated diphenyl ethers （PBDEs） in Beijing, China were investigated. Specifically, the areas contained a solid waste incineration plant, a chemical factory, and a heat and power plant. Investigation of the pollution status of PBDEs in the surface soil from areas around these industries revealed the highest concentration of 42 PBDE congeners （118 ng/g, dry mass） at the solid waste incineration plant. In the other two plants, the highest concentrations were both 26 ng/g （dry mass）. Among the PBDE homologues, the PBDE contamination at all sites showed similar congener compositions, with BDE 209 being the dominant congener. Our findings established the first contamination status of three typical industrial areas in Beijing. Furthermore, the total concentrations of 42 PBDE congeners tended to decrease as the distance from the investigated plants increased. Overall, these plants were identified as potential pollution sources of PBDEs in Beijing. Moreover, Pearson correlation analysis revealed that the major PBDE source in Beijing may be associated with the technical deca-BDE and penta-BDE mixture. Based on the data obtained in this preliminary investigation, further study of the potential of these sources to emit PBDEs in Beijing is warranted.

关键词： different industry areas pollution source polybrominated diphenyl ethers soil

Single Fe atom-anchored manganese dioxide for efficient removal of volatile organic compounds in refrigerator

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Nano Research 2024年第5期17卷 3927-3933页

作者： Yiwen Wang Jun zhang yongfei zhang Yu zhang Zhe Wang Jing Wang Yuen Wu Department of Endocrinology the First Affiliated Hospital of USTCDivision of Life Science and MedicineUniversity of Science and Technology of ChinaHefei 230001China School of Chemistry and Materials Science University of Science and Technology of ChinaHefei 230026China Hefei Hualing Co. LtdHefei 230088China Linkway Technology Co. LtdResearch Institute of Single Atom Catalysts Industry TechnologyNanning 530000China

The efficient and rapid removal of volatile organic compounds(VOCs)holds significant importance for ensuring food quality and human health,particularly within the low-temperature confined spaces in ***,achieving effective VOCs degradation under such conditions poses challenges in terms of activating inert bonds and facilitating mass *** this study,we propose a novel solution by designing a cleaner module that incorporates 1.07%single Fe atom-anchored manganese dioxide catalysts(FeSAs-MnO_(2)).The combination of single Fe atoms and defect-rich MnO_(2) substrate efficiently activates molecular oxygen,leading to enhanced generation of highly reactive oxygen species(ROS).Non-thermal plasma(NTP)and circulating fan are introduced to facilitate the regeneration of catalytic activity and improve mass *** FeSAs-MnO_(2) cleaner module demonstrates exceptional performance in trimethylamine(TMA)removal,achieving a conversion efficiency of 98.9%for 9 ppm within just 9 ***,accelerated aging tests predict an extended service life of up to 45 years for the FeSAs-MnO_(2) cleaner module,surpassing the expected lifespan of refrigerators significantly.

关键词： single atom catalysts volatile organic compounds(VOCs) trimethylamine(TMA) non-thermal plasma(NTP) refrigerator

Improved Geotechnical Behavior of an Expansive Soil Amended with Cationic Polyacrylamide

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Journal of Renewable Materials 2021年第11期9卷 1941-1957页

作者： Shengquan Zhou Minjie Shi Wei Chen yongfei zhang Weijian Wang Haojin zhang Dongwei Li School of Civil Engineering and Architecture Anhui University of Science and TechnologyHuainan232001China School of Civil and Architectural Engineering East China University of TechnologyNanchang330013China

The characteristics of soil treated with cationic polyacrylamide(CPAM)mass content of 0%,0.2%,0.4%,0.6%,0.8%,and 1%were investigated through a series of laboratory tests to explore the practical engineering effect of an expansive soil amended with environmental protection material *** results indicate that with the increasing CPAM content,the liquid limit and plasticity index of soil decrease,the plastic limit increases,and the free swelling ratio and loaded swelling ratio ***,the improved soil has less disintegrating property and better water *** shear strength increases as the content increases,and the optimal content is 0.6%.Meanwhile,the cohesion of the soil first increases and then decreases,and the internal friction angle ***,the unconfined compressive strength first increases and then *** improved soil presents the characteristics of brittle failure and reaches the peak value(410.1 kPa)at the content of 0.8%after curing for 14 *** electron microscope(SEM)exhibits that the number of curved and wrinkled sections of the expansive soil is reduced after CPAM ***,the arrangement of the superimposed polymer changes from face-face to side-angle or side-face-angle,and the reticular structure formed improves the strength and spatial stability of the ***,adding appropriate cationic polyacrylamide could improve expansive soil in engineering.

关键词： Expansive soil cationic polyacrylamide chemical modification laboratory tests microstructure

Study on the performance of silver paste sintered sealing joints for hermetic packaging

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China Welding 2022年第1期31卷 29-36页

作者： Lin Liting zhang yongfei Li Xin School of Materials Science and Engineering Tianjin UniversityTianjin300350China

The traditional hermetic packaging methods,which require high temperatures and high voltages,would have adverse effects on electronics *** on current-assisted sintering technology,we proposed a new hermetic packaging method using silver *** the microstructure of the joints sintered with different currents,we found that with the increasing sintering current from 4.7 kA to 5.3 kA,the density of the joint increases,which improves the hermeticity and bonding strength of the *** results of thermal cycling tests showed that the sealing joints sintered at 4.7 kA with larger porosity are more prone to fail because pores tend to be sources of defects under thermal *** 250 ℃ high thermal storage,there is the coarsening of the pores and the delamination near the Ag/Au interface,degrading the sealing performance of the sintered ***,the sealing joints sintered at 5.3 kA exhibit superior reliability when exposed to high temperatures.

关键词： silver paste electric-current-assisted sintering hermetic package reliability

Potential applications for composite utilization of rubber and plastic in asphalt pavements:A critical review

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Journal of Traffic and Transportation Engineering(English Edition) 2024年第5期11卷 939-971页

作者： Haibin Li Lichang Zhou Yuhang Cai yongfei zhang Bature Auwal Ibrahim Zixuan Feng Liyun Tang Zhigang Li Fayong Yang School of Civil and Architectural Engineering Xi'an University of Science and TechnologyXi'an 710054China Road Engineering Research Center Xi'an University of Science and TechnologyXi'an 710054China School of Highway Chang'an UniversityXi'an 710064China Xi'an Highway Research Institute Co. Ltd.Xi'an 710065China

Waste plastics and rubber have always posed a threat to the environment and a great challenge for *** use of these two waste materials as modifiers for road asphalt provides new road asphalt binders and at the same time provides a new way for waste material resource ***-modified asphalt and plastic-modified asphalt have received widespread attention due to their green and low-carbon characteristics and some performance advantages,but there are still some performance shortcomings that hinder their promotion and *** order to continue to explore the application of waste materials in the field of road engineering,combined with the performance advantages of both,many scholars began to study the rubber-plastic composite modified asphalt(RPCMA).Therefore,this paper reviewed the different types of waste rubber and plastic,the comprehensive performance of different types of asphalt and its mixture performance,analyzed the modification mechanism of rubber-plastic composite modified asphalt and its performance *** results show that rubber-plastic composite modified asphalt is mostly prepared by directly adding modified ***,the pretreatment or melt granulation of rubber and plastic will make the performance of rubber-plastic modified asphalt has *** is a mutual promotion mechanism between rubber and plastic in asphalt,which makes the performance of rubber-plastic modified asphalt better than that of asphalt obtained by a single modification method(rubber modified asphalt or plastic modified asphalt).In some properties,it can be close to the commercial SBS modified *** performance of rubber and plastic composite modified asphalt at high temperature has been generally recognized by researchers,but its low-temperature performance is still ***,it is recommended to apply in high-temperature *** work should focus on the development of composite modifiers with stable performance,low

关键词： Waste rubber Waste plastic Rubber-plastic composite modified asphalt Rheological property

Analysis of characteristics and predictive factors of immune checkpoint inhibitor-related adverse events

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Cancer Biology & Medicine 2021年第4期18卷 1118-1133页

作者： Rilan Bai Naifei Chen Xiao Chen Lingyu Li Wei Song Wei Li Yuguang Zhao yongfei zhang Fujun Han Zheng Lyu Jiuwei Cui Cancer Center the First Hospital of Jilin UniversityChangchun 130021China

Objective:We aimed to retrospectively analyze the toxicity profiles and predictors of immune-related adverse events(irAEs)as well as the correlation between irAEs and the clinical efficacy of multi-type immune checkpoint inhibitors(ICIs)in patients with advanced pan-cancer in a real-world ***:We retrospectively analyzed data from 105 patients with advanced pan-cancer treated with multi-type ICIs at the First Hospital of Jilin University between January 1,2016 and August 1,*** used logistic regression analyses to investigate the associations of irAEs with clinical baseline characteristics,blood count parameters,and biochemical indicators during *** operating characteristic curves were used to determine cutoff values for parameters and area under the curve ***–Meier and Cox multivariate regression analyses were performed to estimate the relationships of baseline characteristics and irAEs with progression-free survival(PFS)and overall survival(OS).Results:A lower relative lymphocyte count(cutoff=28.5%),higher albumin level(cutoff=39.05 g/L),and higher absolute eosinophil count(AEC)(cutoff=0.175×10^(9)/L)were significantly associated with the occurrence of irAEs,among which a higher AEC(cutoff=0.205×10^(9)/L)was strongly associated with skin-related irAEs[odds ratios(ORs)=0.163,P=0.004].Moreover,a higher lactate dehydrogenase level(cutoff=237.5 U/L)was an independent predictor of irAEs of grade≥3(OR=0.083,P=0.023).In immune cell subgroup analysis,a lower absolute count of CD8+CD28−suppressor T cells(OR=0.806;95%confidence interval:0.643–1.011;P=0.062),which are regulatory T lymphocytes,was associated with the occurrence of irAEs,although the difference was not statistically ***,a higher percentage of CD19+B cells was associated with the occurrence of irAEs of grade≥3(P=0.02)and grade≥2(P=0.051).In addition,patients with any grade of irAE had a significantly high PFS(8.37 vs.3.77 months,hazard ratios(HR)=2.02,P

关键词： Neoplasm immune checkpoint inhibitors immune-related adverse events predictor efficacy