检索结果-南通市图书馆

Rare Metals 2009年第2期28卷 142-146页

作者： Zhang, Qian Zhang, Boping Zhao, Pei li, haitao Zhang, limin School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

Ti-Modified (Na0.5K0.5)(TixNb1-x)O3 (NKNT) piezoelectric ceramics were fabricated by double-layer buried powder process at 1020°C for 2 h. The microstructures,and piezoelectric and dielectric properties of the lead-free NKNT ceramics were investigated. X-ray diffraction re-sults indicated that Ti4+ had diffused into the (Na0.5K0.5)NbO3 lattices to form a solid solution with a perovskite structure. The introducing of Ti into the (Na0.5K0.5)NbO3 solid solution effectively reduced the sintering temperature and...

关键词： lead-free piezoelectric ceramics Ti-doped piezoelectric property dielectric property normal sintering oxygen vacancies

Apigenin is an anoikis sensitizer with strong anti-metastatic properties in experimental breast cancer

在线全文

学校读者我要写书评

暂无评论

Food Science and Human Wellness 2024年第4期13卷 2221-2233页

作者： Ruijie Xu Zhijie Yao Hao Zhang haitao li Wei Chen State Key Laboratory of Food Science and Technology Jiangnan UniversityWuxi 214122China School of Food Science and Technology Jiangnan UniversityWuxi 214122China

Loss of susceptibility to anoikis signals is a crucial step in *** resistance therefore represents a promising adjuvant therapeutic target for cancer *** this study,we have conducted a rationalized screening to search for novel leading anoikis sensitizer from daily *** 19 tested dietary phytochemicals,the best results were obtained with apigenin,a natural component of ***,apigenin sensitized breast cancer cells to anoikis,lowered the number of circulating tumor cells,and protected against breast cancer metastasis to lung in ***,we demonstrated that the thromboxane A_(2)(TXA_(2))-TXA_(2)receptor(TP)axis has a critical role in acquired anoikis resistance by activating PI3K-Akt signaling *** of TXA_(2)signaling up-regulated p53 as well as its target gene p21,caused a G1 phase arrest,and finally led to apoptosis in breast cancer ***_(2)level was positively correlated with breast cancer cell anoikis rate,and apigenin significantly inhibited TXA_(2)biosynthesis in vitro and in ***,we identified apigenin as a potent anoikis sensitizer with anti-metastatic properties in a mouse model of breast cancer,and these findings might provide a rationale for introducing apigenin supplementation to breast cancer patients.

关键词： Apigenin Anoikis Breast cancer metastasis Thromboxane A2

Carbon-coated MoS_(2) nanosheets@CNTs-Ti_(3)C_(2) MXene quaternary composite with the superior rate performance for sodium-ion batteries

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2022年第5期100卷 101-109页

作者： Fengyi He Cheng Tang Yadong liu haitao li Aijun Du Haijiao Zhang Institute of Nanochemistry and Nanobiology Shanghai UniversityShanghai 200444China School of Chemistry Physics and Mechanical EngineeringScience and Engineering FacultyQueensland University of TechnologyBrisbaneQLD 4001Australia

The exploration of advanced MoS_(2)-based electrode materials overcoming their inherent low conductivity and large volume changes is of importance for next-generation energy *** this work,we report a simple and high-efficient one-pot hydrothermal approach to prepare a unique and stable 1D/2D *** the architecture,ultrathin carbon layer-coated MoS_(2) nanosheets with large expanded interlayer of 1.02 nm are vertically grown onto the Ti_(3)C_(2) MXene and cross-linked carbon nanotubes(CNTs),giving rise to a highly conductive 3D *** interlayer expanded MoS_(2) nanosheets can greatly facilitate the Na ions/electrons ***,the N-doped 1D/2D CNTs-Ti_(3)C_(2) matrix can be used as a strong mechanical support to well relieve the large volume expansion upon *** a combination result of several advantages,the developed quaternary C-MoS_(2)/CNTs-Ti_(3)C_(2) composite anode shows an excellent sodium storage performance(562 mA h g^(-1) at 100 mA g^(-1) after 200 cycles)and rate capability(475 mA h g^(-1) at 2000 mA g^(-1)).The density functional theory calculations further prove that the full combination of layer-expanded MoS_(2) nanosheets and N-doped Ti_(3)C_(2) matrix can significantly enhance the adsorption energy of Na ions,further resulting in the enhancement of sodium storage capabilities.

关键词： MoS_(2)nanosheets Ti_(3)C_(2)MXene Quaternary composite Nitrogen doping Sodium-ion batteries

Controllable assembly of nitrogen-doped mesoporous carbon with different pore structures onto CNTs for excellent lithium storage

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第3期16卷 3879-3887页

作者： haitao li Xiao Fang Fengting Lv Wei Yu Hui Cheng Haijiao Zhang Institute of Nanochemistry and Nanobiology School of Environmental and Chemical EngineeringShanghai UniversityShanghai 200444China School of Environmental and Materials Engineering College of EngineeringShanghai Polytechnic UniversityShanghai 201209China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin 300071China

Mesoporous carbon nanomaterials have shown a great application potential in energy storage and conversion fields due to their outstanding conductivity,tunable pore structure,and good chemical ***,how to accurately control the pore structure,especially directly assembling the mesoporous carbon onto different substrates remains a big ***,we have successfully assembled two kinds of highly nitrogen-doped mesoporous carbon onto carbon nanotubes(NMC/CNTs)based on a facile cooperative assembly process assisted by triblock PEO_(20)PPO_(70)PEO_(20)(P123)and PEO_(106)PPO_(70)PEO_(106)(F127)*** experimental results indicate that the P_(123)/F_(127)mass ratio has a profound effect on the pore structure,leading to the formation of NMC/CNTs composites with spherical pore structure(S-NMC/CNTs)and cylindrical pore structure(CNMC/CNTs).In virtue of fast electron/ion transfer kinetics,the as-prepared S-NMC/CNTs anode demonstrates an excellent electrochemical performance for lithium-ion batteries,and it delivers a high reversible capacity of 588.1 mAh∙g^(−1)at the current of 0.1 A∙g^(−1)after 100 cycles,along with a superior cycling *** noted,the controlled assembly route developed in our work can also be applied to other support materials with different structures and compositions.

关键词： mesoporous carbon carbon nanotubes controllable assembly formation mechanism lithium-ion batteries

Impact of technology advances on China's CO_2 emission reduction

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 Science Bulletin 2010年第19期55卷 1983-1992页

作者： ZHENG YouFei li haitao WU RongJun WANG lianXi The Key Laboratory of Meteorological Disaster of Ministry of Education Nanjing University oflnformation Science &Technology Nanjing 210044 China The College of Environmental Science and Engineering Nanjing University oflnformation Science & Technology Nanjing 210044 China

Global warming tends to be the major characteristics of the dramatic global climate *** deal with these changes,the impact of reducing greenhouse gas(GHG) emission on Chinese future economic and social development has to be *** this paper,a Regional Integrated model of Climate and the Economy(RICE),which is well known and accepted widely,has been used for Chinese economic assessment of climate change after introduction,assimilation and *** on a sensitivity analysis of technical parameters in the RICE model and constrained targets proposed for energy saving and emissions reduction technological advance programs of China from 2000 to 2050,the economic impact of the programs is *** results indicate that when technology advances,Chinese CO2 emission,climate loss,and the growth rate of atmospheric CO2 concentration and temperature will all *** is assumed that in 2010,the CO2 emission is 20% lower than in 2005,CO2 emission in 2050 would only double the level in 2000,the accumulative CO2 emission would be decreased by 12.4 GtC,and the atmospheric CO2 concentration and temperature in 2050 would reduce by 35 GtC and 0.04°C respectively from 2000 to *** accumulative climate loss from 2000 to 2050 will drop down by 4.6 billion dollar,which only accounts for 6% of the global total ***,the economic benefit the developed countries will obtain is 10 times that for China under such a technological advance *** decrease of the CO2 emission control rate is 1% in cooperation policy while 4.6% in non-cooperation policy,which would relieve China's burden in the control of CO2 total emission and thereby benefit China in participation of the international cooperation for CO2 emission reduction.

关键词：二氧化碳排放量减排技术中国大气二氧化碳浓度全球气候变化经济评估排放总量控制灵敏度分析

A Review on the Mechanical Behaviour of Bamboo Reinforced Concrete Beams

在线全文

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2022年第12期10卷 3629-3657页

作者： Usama Sayed Assima Dauletbek Xue Xin Rodolfo Lorenzo haitao li College of Civil Engineering Nanjing Forestry UniversityNanjing 210037China Joint International Research Laboratory for Bio-composite Building Materials and Structures Nanjing Forestry UniversityNanjing210037China University College London LondonWC1E 6BTUK

In light of the increasing demand for sustainable building materials,the effectiveness of bamboo utilization in various fields has become the object of scientists'close *** increased interest in bamboo is explained by its sustainable characteristics,which make it the most preferred material for environmentally friendly and cost-effective construction compared to conventional *** of bamboo is vast and diverse:from decora-tion and furniture to structural members and re *** to the low price,rich resources,and high ela sticity,bamboo culms have also been used as an alternative to steel reinforcement in concrete ***-sive research has been done to assess feasibilty of bamboo reinforcement in structural elements made of *** article discusses the mechanical properties of three types of structural bamboo reinforced concrete(BRC)*** original papers on the mechanical behaviour of structural BRC members were studied,and the fundamental properties induding typical failure modes,reasons of failure,load displacement relationships,and influencing factors were discussed and *** and conclusions of the review will contribute to deep understanding of structural feasibility of BRC beams and serve as a base for future research.

关键词： Concrete bamboo bamboo reinforced concrete mechanical behaviour

The modulation recognition based on decision-making mechanism and neural network integrated classifier

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

High Technology Letters 2013年第2期19卷 132-136页

作者：袁海英 Sun Xun li haitao School of Electronic Information & Control Engineering Beijing University of Technology Aerospace Electronics Research Academy of China

A neural network integrated classifier(NNIC) designed with a new modulation recognition algorithm based on the decision-making tree is proposed in this ***,instantaneous parameters are extracted in the time domain by the coordinated rotation digital computer(CORDIC) algorithm based on the extended convergence domain and feature parameters of frequency spectrum and power spectrum are extracted by the time-frequency analysis *** pattern identification parameters are calculated under the I/Q orthogonal two-channel structure,and constructed into the feature vector ***,the classifier is designed according to the modulation pattern and recognition performance of the feature parameter set,the optimum threshold is selected for each feature parameter based on the decision-making mechanism in a single classifier,multi-source information fusion and modulation recognition are realized based on feature parameter judge process in the *** results show NNIC is competent for all modulation recognitions,8 kinds of digital modulated signals are effectively identified,which shows the recognition rate and anti-interference capability at low SNR are improved greatly,the overall recognition rate can reach 100%when SNR is12dB.

关键词： modulation recognition decision-making mechanism neural network integratedclassifier (NNIC) feature extraction

A Simple and Effective Surface Defect Detection Method of Power line Insulators for Difficult Small Objects

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2024年第4期79卷 373-390页

作者： Xiao Lu Chengling Jiang Zhoujun Ma haitao li Yuexin liu State Grid Jiangsu Electric Power Co. Ltd.Nanjing210024China State Grid Changzhou Power Supply Company Changzhou213003China

Insulator defect detection plays a vital role in maintaining the secure operation of power *** address the issues of the difficulty of detecting small objects and missing objects due to the small scale,variable scale,and fuzzy edge morphology of insulator defects,we construct an insulator dataset with 1600 samples containing flashovers and *** a simple and effective surface defect detection method of power line insulators for difficult small objects is ***,a high-resolution featuremap is introduced and a small object prediction layer is added so that the model can detect tiny ***,a simplified adaptive spatial feature fusion(SASFF)module is introduced to perform cross-scale spatial fusion to improve adaptability to variable multi-scale ***,we propose an enhanced deformable attention mechanism(EDAM)*** integrating a gating activation function,the model is further inspired to learn a small number of critical sampling points near reference *** the module can improve the perception of object *** experimental results indicate that concerning the dataset of flashover and breakage defects,this method improves the performance of YOLOv5,YOLOv7,and *** practical application,it can simply and effectively improve the precision of power line insulator defect detection and reduce missing detection for difficult small objects.

关键词： Insulator defect detection small object power line deformable attention mechanism

Mathematical Model and Machining Method for Spiral Flute Rake Faces of Hourglass Worm Gear Hob

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

Transactions of Nanjing University of Aeronautics and Astronautics 2019年第3期36卷 401-412页

作者： YANG Jie li haitao RUI Chengjie HUANG Yi ZHANG Xiaodi College of Engineering China Agricultural UniversityBeijing 100083P.R.China Key Laboratory of Optimal Design of Modern Agricultural Equipment in Beijing China Agricultural UniversityBeijing 100083P.R.China Beijing Kuiente Technology Co LtdBeijing 100043P.R.China

To improve the cutting performance of an hourglass worm gear hob and the accuracy of the resulting worm gear,the rake angles of the teeth on the pitch circle should be reduced.A method of forming the spiral flutes by using a variable transmission ratio was *** method ensures that the rake angles on the indexing torus of each tooth are approximately 0°.Based on the gear meshing theory and the hourglass worm forming method,the discretization mathematical model of the rake face of a planar double enveloping worm gear hob was established by using cylindrical generating surface,and the feed parameters for machining the rake face for a variable transmission ratio were *** spiral flute was simulated and the hob was machined on a four axis CNC milling machine.A contourgraph was used to measure the rake *** measurement results showed that the proposed method can reduce the absolute value of the rake angle on both sides of the cutting teeth,which can be used for machining the spiral flute rake face of an hourglass worm gear hob.

关键词： hourglass worm gear hob cylindrical generating surface spiral flute rake face rake angle

Phase tracking approach for TDOA measurements in critical lunar spaceflights

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2020年第2期63卷 239-241页

作者： Wanhong HAO Cheng CHENG Daihui MO Zhenghao ZHANG haitao li Beijing Institute of Tracking and Telecommunications Technology Department of Electronic Engineering Tsinghua University Institute of China Electronic and Equipment System Corporation

Dear editor,In the coming years, China will make a series of profound breakthroughs in the field of lunar and deep space explorations, such as the Chang’E-4landing on the far-side of the moon, the Chang’E-5 sample return, and the ambitious Mars mission. These missions include a spacecraft powered descending flight, which is the most critical and

关键词： Doppler Phase tracking approach for TDOA measurements in critical lunar spaceflights