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Mechanical Properties of Metallic Pseudo Rubber-Silicon Rubber Composite for Three-Way Seismic Isolation

REVUE DES COMPOSITES ET DES MATERIAUX AVANCES-JOURNAL OF COMPOSITE AND ADVANCED MATERIALS 2019年第6期29卷 341-350页

作者： zhao, Yagebai Ding, Puzheng zhao, Ying Yan, xuwen Northeast Forestry Univ Coll Civil Engn Haerbin 150040 Peoples R China

This paper mainly carries out the preliminary work for the design of an innovative three-way seismic isolator based on the metallic pseudo rubber-silicon rubber (MPR-SR) composite. First, the MPR-SR composite was prepared by adding the SR, a high-molecular polymer, to the MPR, and several MPR-SR specimens of different molding densities were prepared. Next, the specimens were subjected to compression and shear tests under quasi-static and dynamic loads, respectively. Several tests were carried out to reflect how these behaviors are affected by load amplitude, cycle count, loading frequency and molding density. The mechanical properties and damping features between the specimens were compared and analyzed in details. On this basis, the author examined the mechanical properties and SI mechanism of the MPR-SR composite. The results show that the MPR-SR composite has good recoverability under compressive and shear deformations: the composite can recover even if 40% of it has been deformed under compression and 80% under shear load;the hysteretic energy dissipation ability of the composite increases with the molding density;the loading frequency and cycle number have basically no impact on the compressive hysteretic behavior of the composite. To sum up, the MPR-SR enjoys good stiffness and energy dissipation ability, and serves as an excellent material for anti-corrosion, antioxidant three-way seismic isolator.

关键词： metallic pseudo rubber-silicon rubber (MPR-SR) composite three-way seismic isolator compression shear hysteretic behavior

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Microenvironment-tailored micelles restrain carcinoma-astrocyte crosstalk for brain metastasis

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JOURNAL OF CONTROLLED RELEASE 2022年 349卷 520-532页

作者： zhao, Zhenhao Zhang, Yujie Li, Chao Li, xuwen Chu, Yongchao Guo, Qin Zhang, Yiwen Xia, Weiyi Liu, Peixin Chen, Hongyi Wang, Yu Li, Chufeng Sun, Tao Jiang, Chen Fudan Univ Sch Pharm Dept Pharmaceut Key Lab Smart Drug Delivery Shanghai 201203 Peoples R China Fudan Univ MOE Frontiers Ctr Brain Sci Shanghai 201203 Peoples R China

Breast-to-brain metastatic cells can interact with the surrounding cells, including astrocytes and microglia, to generate a pro-tumorigenic niche. Breast-to-brain metastasis can be treated using a dual strategy of eliminating metastatic tumor cells and normalizing their localized microenvironment. The effective accumulation of drugs at the action site of metastasis is crucial to realizing the above strategy, especially when dealing with the bloodbrain barrier (BBB)-penetrating and tumor-targeting tactics. Here, we establish an in-situ microenvironmenttailored micelle (T-M/siRNA) to co-deliver therapeutic siRNA and paclitaxel (PTX) into the breast-to-brain metastasis. Anchored with a D-type cyclic peptide, T-M/siRNA can penetrate the BBB and subsequently target the brain metastases. Upon internalization by metastatic tumor cells, T-M/siRNA can release PTX in the highlevel glutathione (GSH), resulting in killing cancer cells. Meanwhile, the micellar structure is dissociated, resulting in lowering the charge density to release the loaded siRNA that can targeted downregulate the expression of protocadherin 7 (PCDH7). Treatment of model mice revealed that T-M/siRNA can inhibit the abnormal activation of astrocytes and immunosuppressive activation of microglia, resulting in significantly enhanced synergistic anti-tumor efficacy. This study indicates that the micelle system can serve as a hopeful strategy to treat breast-to-brain metastasis.

关键词： Breast -to -brain metastasis Micelle Microenvironment Protocadherin 7 Paclitaxel

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Characterization of thermal neutron distribution of an Am-Be neutron source setup by CdZnTe detector

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APPLIED RADIATION AND ISOTOPES 2023年 196卷 110778页

作者： Liang, xuwen zhao, Dong Jia, Wenbao Hei, Daqian Cheng, Can Nanjing Univ Aeronaut & Astronaut Dept Nucl Sci & Technol Nanjing Peoples R China Jiangsu Higher Educ Inst Collaborat Innovat Ctr Radiat Med Suzhou 215000 Peoples R China Lanzhou Univ Sch Nucl Sci & Technol Lanzhou 730000 Peoples R China Nanjing Univ Aeronaut & Astronaut Coll Astronaut Nanjing 211106 Peoples R China

Owing to the developments in prompt gamma neutron activation analysis (PGNAA) and prompt gamma ray activation imaging (PGAI), it is necessary to develop an online thermal neutron distribution measurement method. The CdZnTe detector is considered as an alternative thermal neutron detector because of its high thermal neutron capture cross section. In this study, the thermal neutron field of an 241Am-Be neutron source was determined by CdZnTe detector. The intrinsic neutron detection efficiency of CdZnTe detector was calcu-lated by using indium foil activation, and the value was 3.65%. Then the characteristics of neutron source were conducted with the calibrated CdZnTe detector. The thermal neutron fluxes in front of beam port were measured at several distances ranging from 0 cm up to 28 cm. Thermal neutron field at distances of 1 cm and 5 cm were also measured. The experimental data were then compared with Monte Carlo simulation. The results demon-strated that the simulated data agree well with experimental measurements.

关键词： CdZnTe detector Monte Carlo simulation Am -Be neutron source Activation method Thermal neutron flux

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星载多波束天线通道误差特性分析及校准

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江苏大学学报（自然科学版） 2012年第5期33卷 549-554页

作者：赵星惟龚文斌梁旭文上海微小卫星工程中心上海200050 中国科学院上海微系统与信息技术研究所上海200050

针对星载多波束天线幅相误差对天线性能影响较大的问题,通过对多波束发射天线的射频通道在不同温度下的幅相特性进行试验测定,得到了通道幅相特性与温度的对应关系,发现不同通道的幅相特性与通道温度的关系曲线在给定温度区间内基本呈... 详细信息

针对星载多波束天线幅相误差对天线性能影响较大的问题,通过对多波束发射天线的射频通道在不同温度下的幅相特性进行试验测定,得到了通道幅相特性与温度的对应关系,发现不同通道的幅相特性与通道温度的关系曲线在给定温度区间内基本呈线性关系,且斜率基本一致,从而确定了对不同通道的幅相特性进行固定值补偿的校准策略.通过固定值补偿后,各通道的幅相特性曲线基本重合,从而消除了通道间幅相误差.进一步给出了提升温度一致性的措施,并设计了多波束发射天线的校准原理框图和校准流程图.结果表明:新的星载多波束天线幅相误差校准方法是有效的.

关键词：卫星多波束天线通道误差幅相误差校准

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Analysis and Validation of a Unified Slip Factor Model for Impellers at Design and Off-Design Conditions

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JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME 2011年第4期133卷 41018-41018页

作者： Qiu, xuwen Japikse, David zhao, Jinhui Anderson, Mark R. Concepts NREC White River Jct VT 05001 USA

This paper presents a unified slip model for axial, radial, and mixed-flow impellers. The core assumption of the model is that the flow deviation or the slip velocity at the impeller exit is mainly originated from the blade loading near the discharge of an impeller and its subsequent relative eddy in the impeller passage. The blade loading is estimated and then used to derive the slip velocity using Stodola's assumption. The final form of the slip factor model can be successfully related to Carter's rule for axial impellers and Stodola's slip model for radial impellers, making the case for this model applicable to axial, radial, and mixed-flow impellers. Unlike conventional slip factor models for radial impellers, the new slip model suggests that the flow coefficient at the impeller exit is an important variable for the slip factor when there is significant blade turning at the impeller discharge. This explains the interesting off-design trends for slip factor observed from experiments, such as the rise of the slip factor with flow coefficient in the Eckardt A impeller. Extensive validation results for this new model are presented in this paper. Several cases are studied in detail to demonstrate how this new model can capture the slip factor variation at the off-design conditions. Furthermore, a large number of test data from more than 90 different compressors, pumps, and blowers were collected. Most cases are radial impellers, but a few axial impellers are also included. The test data and model predictions of the slip factor are compared at both design and off-design flow conditions. In total, over 1650 different flow conditions are evaluated. The unified model shows a clear advantage over the traditional slip factor correlations, such as the Busemann-Wiesner model, when off-design conditions are considered. [DOI: 10.1115/1.4003022]

关键词： blades design impellers

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PtCo with oxidase-like activity and laccase for synergistic catalytic degradation of phthalic acid esters

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JOURNAL OF CLEANER PRODUCTION 2024年 470卷

作者： zhao, Xuqiang Tang, Lei Chen, xuwen Wang, Jian Gao, Yanzheng Nanjing Agr Univ Coll Resources & Environm Sci Inst Organ Contaminant Control & Soil Remediat Nanjing 210095 Jiangsu Peoples R China

Phthalic acid esters (PAEs) as common plasticizers, providing convenience to humans. However, they also present a potential threat to ecosystems and human health as emerging contaminants. In this study, co- immobilization of nanozyme (PtCo) and laccase (Lac) into dendritic mesoporous silica (DMSN) constitutes nanomaterials (Lac@PtCo@DMSN). PtCo with an atomic ratio of 3:1 has the highest oxidizing activity. DMSN exhibited a maximum Lac loading capacity of 365 mg/g and activity of Lac@PtCo@DMSN exhibits excellent pH, temperature, and storage stability and reusability, and demonstrated greater recoverability. Remarkably, Lac@PtCo@DMSN (50 mg) achieved 81.83% degradation of total PAEs within 72 h and maintained 72.44% degradation of dimethyl phthalate (DMP) in the fifth cycle. Electron transfer between Pt, Co and adsorbed oxygen (O-2ads) in PtCo can generate center dot OH and center dot O-2(-), which were the dominant reactants for PAEs degradation. center dot OH could degrade PAEs to phthalic acid via H-abstration and center dot OH addition. center dot OH effectively enhanced Lac activity, and promoted the synergistic catalytic performance of nanozymes and natural enzymes. The degradation of phthalic acid by Lac accelerated the release of PtCo@DMSN reaction sites, resulting in significantly enhanced PAEs degradation. Thus, artificial/natural enzymes can degrade PAEs without exogenous additives to solve the limitation of Lac application, providing a new strategy for degrading contaminants in water.

关键词： Phthalic acid esters Nanozyme Laccase (Lac) Reactive oxygen species (ROS) Dendritic mesoporous silica

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Stereo Matching Algorithm of Color Image Based on Weber's Law and Census

Stereo Matching Algorithm of Color Image Based on Weber's La...

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International Conference on Intelligent Information Hiding and Multimedia Signal Processing (IIHMSP)

作者： Qiang Wu Xiangnan zhao xuwen Li College of Electronic Information and Control Engineering Beijing University of Technology Beijing China College of Life Science and Bioengineering Beijing University of Technology Beijing China

The algorithm presented here is used on unmanned aerial vehicles system. In 2013,*** proposed a matching cost computation model(or function), This matching cost model combined three kinds of constraints, the cost function is formulated by combining three individual costs:a cost computed on an extended census transformation of the images, the absolute difference cost, taking into account information from colour channels, and a cost based on the principal image *** show that the cost function is excellent performance in similar *** it to the stereo matching of ancient buildings, it is favorable for practical. However, this experiment, in color mutated region, leaded to blurred ***, our proposed method added color space structural information, which based on HVS Weber's law, to the cost function. we use the differential excitation of WLD reflects the structure of color *** robust cost measures can reduce percent of bad pixels in mutated color region. The proposed method use color image, which is used after epipolar line rectification.

关键词： Image color analysis Cost function Transforms Robustness Computed tomography Stereo vision Skeleton

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Parental category B vaccine hesitancy and associated factors in China: an online cross-sectional survey

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EXPERT REVIEW OF VACCINES 2022年第1期21卷 145-153页

作者： Han, Ying Wang, Qiang zhao, Shuangyu Wang, Jianli Dong, Shuheng Cui, Tingting Liu, Minqi Shi, Naiyang Yang, Liuqing Han, Yue Xiu, Shixin Wang, xuwen Jin, Hui Southeast Univ Sch Publ Hlth Dept Epidemiol & Hlth Stat Nanjing Peoples R China Southeast Univ Sch Publ Hlth Key Lab Environm Med Engn Minist Educ Nanjing Peoples R China Wuxi Ctr Dis Control & Prevent Wuxi Jiangsu Peoples R China

Background Vaccine hesitancy is one of the top ten health threats. We aimed to (1) assess parental Category B vaccines hesitancy and associated sociodemographic factors in China, and (2) explore the association between attitude toward vaccines and self-reported hesitant behavior. Methods A cross-sectional study was performed through a web-based anonymous online questionnaire survey between 9 February and 7 April 2021. Chinese parents aged >= 18 years with one child aged < 6 years were included to assess vaccine hesitancy using the vaccine-hesitancy scale (VHS). Structural equation model was used to determine relationships between variables. Results Of 2952 Chinese parents included in the analysis, 17.5% were highly hesitant in Category B vaccines. Parents who were younger, less educated, engaged in health-related occupations, and had been vaccinated against influenza in the past year were more hesitant when vaccinating their children (P < 0.001). VHS score accuracy to identify vaccine-hesitant behavior was acceptable, and the optimal cutoff was 37.50 (with 61.96% parental vaccine hesitancy). Parents who lack confidence or believe vaccines were risk were more likely to show vaccine hesitant behavior (P < 0.001). Conclusions In China, effective interventions need to be implemented to eliminate parental Category B vaccines hesitancy.

关键词： Vaccine hesitancy Parents Structural equation model Online survey China

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采用三音校准法的星载多波束天线校准系统

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江苏大学学报（自然科学版） 2012年第2期33卷 181-186页

作者：赵星惟龚文斌梁旭文上海微小卫星工程中心上海200050 中国科学院上海微系统与信息技术研究所上海200050

为了解决宽带多波束天线系统中常规校准不能兼顾工作频带的低频段和高频段的问题,根据星载多波束天线系统的特点,提出了三音校准法.采用3个单音信号作为校准信号对多波束系统的通道进行测量,以二次拟合得到全工作带宽内的通道幅相特性曲... 详细信息

为了解决宽带多波束天线系统中常规校准不能兼顾工作频带的低频段和高频段的问题,根据星载多波束天线系统的特点,提出了三音校准法.采用3个单音信号作为校准信号对多波束系统的通道进行测量,以二次拟合得到全工作带宽内的通道幅相特性曲线,并采用多次测量形成拟合点,降低了测量误差的影响;再以拟合的特性曲线的逆函数进行通道幅相补偿,使全带宽内通道特性曲线成为水平直线,从而完成了单通道的校准;最后以补偿项补偿通道间幅相差异,从而达到通道间误差校准的目的.并将三音校准法应用到卫星天线的近场校准和内部校准2种校准系统中.结果表明:三音校准法比传统的单点校准和分段式校准更利于通道间误差的校准,能够有效地抑制通道的不一致性.

关键词：校准误差天线阵列多波束天线卫星天线

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An aramid nanofibers-based gel polymer electrolyte with high mechanical and heat endurance for all-solid-state NIR electrochromic devices

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SOLAR ENERGY MATERIALS AND SOLAR CELLS 2019年 200卷 109952-000页

作者： Yang, xuwen Cong, Shan Li, Juan Chen, Jian Jin, Feng zhao, Zhigang Univ Sci & Technol China Sch Nano Technol & Nano Bion Hefei 230026 Anhui Peoples R China Chinese Acad Sci Key Lab Nanodevices & Applicat Suzhou Inst Nanotech & Nanobion Suzhou 215123 Peoples R China Chinese Acad Sci Key Lab Multifunct Nanomat & Smart Syst Suzhou 215123 Peoples R China Chinese Acad Sci Div Nanomat Suzhou Inst Nanotech & Nanobion Nanchang 330200 Jiangxi Peoples R China

A new type of gel polymer electrolyte composed of free-standing aramid nanofibers was used to fabricate allsolid-state near-infrared (NIR) electrochromic devices for NIR sheltering applications. This new type of gel polymer electrolyte showed excellent mechanical and heat endurance compared with currently available gel polymer electrolytes. The good film-forming ability of the aramid nanofibers makes assembling the electrochromic devices more convenient. The as-fabricated device showed an optical modulation of about 40% at 980 nm and achieved a coloration efficiency of 79.5 cm(2)C(-1), values that are larger than those previously reported for other electrochromic devices with similar structures. It is expected that aramid nanofibers-LiCIO4-based electrolyte films with high mechanical and heat endurance will have potential applications in spacecraft thermal control, optical communication, and biomedical analysis.

关键词： Near-infrared Aramid nanofibers Gel polymer electrolyte Thermal stability Electrochromic devices

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