检索结果-南通市图书馆

Monodentate AIEgen Anchored on Metal-Organic Framework for Fast Fluorescence Sensing of Phosphate

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2021年第1期39卷 99-105页

作者： Xinli Gao Lei pei Wenjuan Xue Hongliang Huang Zhuqing Gao Xudong Zhao Instrumental Analysis Center Taiyuan University of Science and TechnologyTaiyuanShanxi 030024China College of Chemical and Biological Engineering Taiyuan University of Science and TechnologyTaiyuanShanxi 030024China State Key laboratory of Separation Membranes and Membrane Processes School of Chemistry and Chemical EngineeringTiangong UniversityTianjin 300387China

Herein,a novel sensor(TPE-UiO-66)was designed via anchoring monodentate tetraphenylethylene(TPE)onto UiO-66 *** combination of the distinct aggregation-induced emission(AIE)of TPE and the easy replacement of monodentate linker by guest phosphate,makes TPE-UiO-66 an ideal pltform for sensing HPO_(4)^(2-)。Experimental results indicate that TPE-UiO-66 can selectively sense HPO_(4)^(2-)from other common anions.

关键词： Metal-organic frameworks Fluorescent probes Phosphate Monodentate ligand|AlEgen

Assessing Market Competition in the Chinese Banking Industry Based on a Conjectural Variation Model

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China & World Economy 2021年第2期29卷 73-98页

作者： Xiangyi Zhou Zheng pei Botao Qin Jinhe Center for Economic Research Xi'an Jiaotong UniversityChina Antai College of Economics and Management Shanghai Jiaotong UniversityChina

Most literature on market competition in the banking industry neglects to address strategic interaction among *** paper studies interaction among Chinese banks by dividing banks into two groups:dominant banks(the"Big 5f,state-owned banks)and small-and medium-sized banks(joint-stock banks and large city commercial banks).We test an oligopolistic model with conjectural variation developed by Spiller and Favaro(1984).Using data from 2007 to 2016,we find that banking competition is not in the form of Stackelberg competition per *** strategic interactions exist between small-and medium-sized banks and the largest state-owned *** also study the effect of interest rate deregulation on oligopolies'strategic *** results show that interest rate deregulation stimulates banking competition by reducing collusiveness among the dominant state-owned banks and enhancing the market power of small and medium banks.

关键词： banking industry conjectural variation interest rate deregulation market structure

富于巨细胞型骨肉瘤SPECT/CT影像学表现

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

罕少疾病杂志 2024年第3期31卷 87-89页

作者：赵颖李培岭刘玉珂河南省洛阳正骨医院(河南省骨科医院)影像中心河南洛阳471000

目的探讨分析富于巨细胞型骨肉瘤(GCRO)的影像学特征,以提高对该病的诊断水平。方法回顾性分析我院经过病理证实的2例GCRO患者资料并进行文献总结,总结该病的临床、病理及影像特征,并随访最终结局。结果男性患者1例,38岁,股骨旁GCRO,女... 详细信息

目的探讨分析富于巨细胞型骨肉瘤(GCRO)的影像学特征,以提高对该病的诊断水平。方法回顾性分析我院经过病理证实的2例GCRO患者资料并进行文献总结,总结该病的临床、病理及影像特征,并随访最终结局。结果男性患者1例,38岁,股骨旁GCRO,女性患者1例,76岁,股骨近端髓腔型GCRO。(1)骨旁GCRO的影像表现:病变位于骨旁,DR表现为骨旁软组织内钙化影,形态不规则;CT表现为骨旁密度不均匀的肿块,内见位于肿块基底部的不规则团状钙化或骨化影,肿块约包绕股骨干的90%;全身骨显像及SPECT/CT融合图像表现为肿块内放射性核素异常浓聚。(2)髓腔型GCRO的影像表现:病变位于股骨近端,CT表现为膨胀性偏心性溶骨性骨质破坏,边缘不连,未见明显骨膜反应;全身骨显像及SPECT/CT图像表现为病变区边缘及中心区的不规则状放射性核素异常浓聚;结论GCRO罕见,影像学易误诊,常规影像学检查具有一定的特征性影像学表现,SPECT/CT结合常规影像学检查有助于诊断,确诊需结合多种影像学资料和组织病理学检查。

关键词：巨细胞骨肉瘤体层摄影术 X线计算机 SPECT/CT

Metabolomics and biomarkers in ocular matrix: beyond ocular diseases

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2020年第6期13卷 991-1003页

作者： Yun Luo Hong-pei Cui Yi Liu Lei Chen School of Chinese Medicine Guangdong Pharmaceutical UniversityGuangzhou 510006Guangdong ProvinceChina Department of Ophthalmology Henan Provincial People's HospitalZhengzhou 450003Henan ProvinceChina School of Chinese Medicine Southern Medical UniversityGuangzhou 510515Guangdong ProvinceChina

According to the recent report,there are 870 million people suffer from ocular diseases *** present approaches for diagnosis are morphological examination,imaging examination and immunological examination,regrettably,they lack of sensitivity and difficult to make a definite diagnosis in the early *** biology as an effective method has been used in clinical diagnosis and treatment for diseases,especially metabolomics which is more attractive with high sensitivity and *** previous researches had been confirmed that endogenous metabolites in the ocular matrix play a crucial role in the progress of diseases related diseases,the standard protocols and systematic summary about the biomarker researches based on ocular matrix has not been *** review article highlights the pretreatment for ocular matrix and the new biomarkers expressed by the eye diseases,expected to promote the application of biomarkers in the diagnosis and treatment of eye diseases.

关键词： metabolomics biomarkers ocular matrix ocular diseases diagnosis

The role of NiFe_(2)O_(4)nanoparticle in the anaerobic digestion(AD)of waste activated sludge(WAS)

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2022年第1期33卷 428-433页

作者： Lihong Zhou Xueqian Yan Xiangjun pei Jie Du Rui Ma Jin Qian College of Ecology and Environment Chengdu University of TechnologyChengdu 610000China School of Chemistry and Chemical Engineering Northwestern Polytechnical UniversityXi'an 710072China State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610000China Jiuzhaigou Administration Bureau Aba 623402China

Anaerobic digestion(AD)is a promising technology for the treatment of waste activated sludge(WAS)with energy ***,the low methane yield and slow methanogenesis limit its broad *** this study,the NiFe_(2)O_(4)nanoparticles(NPs)were fabricated and applied as a conductive material to enhance the AD via promoting the direct interspecies electron transfer(DIET).The crystal structure,specific surface area,morphology and elemental composition of the as-prepared NiFe_(2)O_(4)NPs were characterized by X-ray diffraction(XRD),Brunauer-Emmett-Teller(BET),scanning electron microscopy(SEM)and energy dispersive spectroscopy(EDS).The biochemical methane potential(BMP)test was performed(lasting for 35 days)to evaluate the energy recovery in AD with the addition of the NiFe_(2)O_(4)*** results illustrate that NiFe_(2)O_(4)NPs could accelerate both the hydrolysis,acidogenesis and methanogenesis,i.e.,the cumulative methane production and daily methane yield increased from 96.76±1.70 mL/gVS and 8.24±1.26 mL gVS^(-1)d^(-1)in the absence of NiFe_(2)O_(4)NPs(Group A)to 123.69±3.20 mL/gVS and 9.71±0.77 mL gVS^(-1)d^(-1)in the presence of NiFe_(2)O_(4)NPs(Group B).The model simulation results showed that both the first-order kinetic model and the modified Gompertz model can well simulate the experimental *** hydrolysis rate constant k increased from 0.04±0.01 d^(-1)in Group A to 0.06±0.01 d^(-1)in Group *** the maximum methane production potential and activity were both improved after adding NiFe_(2)O_(4).The microbial community analysis revealed that the microorganisms associated with hydrolysis and acidogenesis were more abundant in the presence of NiFe_(2)O_(4).And the methanogenic archaea were enriched to a larger extent,resulted in the higher methanogenesis activities via dosing NiFe_(2)O_(4).

关键词： Anaerobic digestion(AD) Waste activated sludge(WAS) Methane production NiFe_(2)O_(4) Direct interspecies electron transfer(DIET) Microbial community analysis

Mechanical and tribological performance of CoCrNiHf_(x)eutectic medium-entropy alloys

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2021年第31期90卷 194-204页

作者： Yin Du Xuhui pei Zhaowu Tang Fan Zhang Qing Zhou Haifeng Wang Weimin Liu State Key Laboratory of Solidiﬁcation Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi’an 710072China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China State Key Laboratory of ASIC and System School of MicroelectronicsFudan UniversityShanghai 200433China

The excellent properties of the multi-principal element alloys(e.g.,the CoCrNi medium-entropy alloy)make them a perfect candidate for structure *** low strength and poor wear-resistance,however,limit considerably their *** this study,a lamellar eutectic microstructure was introduced by addition of Hf into CoCrNi alloy to produce a series of CoCrNiHf_(x)(x=0.1,0.2,0.3 and 0.4)eutectic medium-entropy alloys.A homogeneous eutectic microstructure with an alternate array of the soft FCC solid-solution phase and the hard Laves phase was identified for the as-cast CoCrNiHf_(0.3)*** an investigation of the microstructure,mechanical and tribological properties,it was found that the hardness(plasticity)increases(decreases)with the increasing volume fraction of the Laves phase and the CoCrNiHf_(0.3)eutectic alloy exhibits both good plasticity and high *** wear behavior is strongly dependent on the applied normal *** a low normal load,its tribological behavior follows the Archard's equation and a higher hardness due to Hf addition can resist plastic deformation and abrasive *** the normal load is high enough,the hypoeutectic or hypereutectic alloy,which possessing either high strength or good ductility but not at the same time,exhibit a poor wear *** comparison,the full eutectic CoCrNiHf_(0.3)alloy with a superior combination of strength and toughness shows the best wear performance,as it can significantly reduce fracture during wear.

关键词： Medium-entropy alloy Lamellar eutectics Hardness Plasticity Wear-resistance

Transferring priors from virtual data for crowd counting in real world

在线全文

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2022年第3期16卷 1-8页

作者： Xiaoheng JIANG Hao LIU Li ZHANG Geyang LI Mingliang XU pei LV Bing ZHOU School of Information Engineering Zhengzhou UniversityZhengzhou 450001China School of Information Engineering Henan University of Science and TechnologyLuoyang 471000China

In recent years,crowd counting has increasingly drawn attention due to its widespread applications in the field of computer *** of the existing methods rely on datasets with scarce labeled images to train *** are prone to suffer from the over-fitting ***,these existing datasets usually just give manually labeled annotations related to the head center *** kind of annotation provides limited *** this paper,we propose to exploit virtual synthetic crowd scenes to improve the performance of the counting network in the real *** we can obtain people masks easily in a synthetic dataset,we first learn to distinguish people from the background via a segmentation network using the synthetic *** we transfer the learned segmentation priors from synthetic data to real-world ***,we train a density estimation network on real-world data by utilizing the obtained people *** experiments on two crowd counting datasets demonstrate the effectiveness of the proposed method.

关键词： crowd counting synthetic data virtual-real combination people segmentation density estimation

Attitude estimation method based on extended Kalman filter algorithm with 22 dimensional state vector for low-cost agricultural UAV

在线全文

学校读者我要写书评

暂无评论

High Technology Letters 2020年第2期26卷 125-135页

作者： Wu Helong pei Xinbiao Li Jihui Gao Huibin Bai Yue Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033P.R.China University of Chinese Academy of Sciences Beijing 100049P.R.China

To overcome the shortcomings of traditional artificial spraying pesticides and make more efficient prevention of diseases and pests,a coaxial sixteen-rotor unmanned aerial vehicle(UAV)with pesticide spraying system is *** coaxial sixteen-rotor UAV’s basic structure and attitude estimation method are *** whole system weights 25 kg,cruising speed can reach 15 m/s,and the flight time is more than 20 *** the UAV takes large load,the traditional extended Kalman filter(EKF)attitude estimation method can not meet the work requirements under the condition of strong vibration,the attitude measure accuracy is poor and the attitude angle divergence is easily *** an attitude estimation method based on EKF algorithm with 22 dimensional state vector is proposed which can solve these *** UAV system consists of STM32F429 as controller,integrating following measure sensors:accelerometer and gyroscope MPU6000,magnetometer LSM303D,GPS NEO-M8N and *** attitude unit quaternion,velocity,position,earth magnetic field,biases error of gyroscope,accelerometer and magnetometer are introduced as the inertial navigation systems(INS)state vector,while magnetometer,global positioning system(GPS)and barometer are introduced as observation vector,thus making the estimate of the navigation information more *** control strategy of coaxial sixteen-rotor UAV is based on the control method of combining active disturbance rejection control(ADRC)and proportion integral derivative(PID)*** flight data are used to verify the algorithm,and the static experiment shows that the precision of roll angle and pitch angle of the algorithm are±0.1°,the precision of yaw angle is±0.2°.The attitude angle output of MTi sensor is used as *** dynamic experiment shows that the accuracy of attitude estimated by EKF algorithm is quite similar to that of MTi’s output,moreover,the algorithm has good real-time performance which meets the need of hi

关键词： coaxial sixteen-rotor unmanned aerial vehicle(UAV) extended Kalman filter(EKF) quaternion low-cost

Effect of the withdrawal rate on the microstructure and creep behavior of the directionally solidified nickel-based superalloy

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2023年第3期33卷 343-354页

作者： Yizhe Yang Zhixun Wen Haiqing pei Yunsong Zhao Xipeng Yin Shuaishuai Wang Zhufeng Yue School of Mechanics Civil Engineering and Architecture Northwestern Polytechnical University Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical Materials

The effect of the withdrawal rate on the microstructure and creep behavior of a directionally solidified nickelbased superalloy DZ125L is investigated in this study. A directionally solidified nickel-based superalloy is directionally solidified using the high rate directional solidification(HRS) process at various withdrawal *** results show that the closely packed dendrite arms and well distributed γ’phase can significantly enhance the creep rupture life of the alloys, while the carbides and γ/γ’eutectics affect the strength failure and fracture of materials. A series creep tests are performed on the nickel-based directionally solidified superalloy after different withdrawal rates. With an increasing withdrawal rate, the creep life of the alloy first increases and then *** K–R creep damage model is established, which can reflect the quantitative relation between the withdrawal rate and creep life. The model simulation results are in good agreement with the tests.

关键词： Directionally solidified nickel-based superalloy Withdrawal rate Microstructure Creep K-R creep damage model