检索结果-南通市图书馆

Chinese Journal of Polymer Science 2021年第7期39卷 849-855页

作者： Xiao-Lan Qiao Jie Yang lian-he han Ji-Dong Zhang Mei-Fang Zhua State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China

Poly(3-hexylthiophene)(P3HT)thin films,obtained by normal spin-coating and solvent vapor assisted spin-coating(SVASP)before and after thermal annealing(TA),and the corresponding devices were prepared to unravel the microstructure-property relationship,which is of great importance for the development of organic *** SVASP-TA films were used as the active layers of the organic field-effect transistors,a hole mobility up to 0.38 cm^(2)·V^(-1)·s^(-1)was *** mobility was one of the highest values and one order of magnitude higher than that of the normal spin-coating films based *** relationship between the microstructure and the device performance was fully investigated by UV-Vis absorption spectra,grazing incident X-ray diffraction(GIXD),and atomic force microscopy(AFM).The impressive mobility was attributed to the high crystallinity and ordered molecule packing,which stem from the synergistic effects of SVASP and thermal annealing.

关键词： Poly(3-hexylthiophene) Polymer field-effect transistors Microstructure Polymer semiconductors

Poly(3-hexylthio) thiophene Field-effect Transistor Device Performance: Impact of the Content of hexylthio Side Chain on Backbone

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2024年第1期42卷 14-23,I0005页

作者： Hao-Yu Liu lian-he han Ling-Wei Kong Li-Ping Zhu Xiao-Lan Qiao Mei-Fang Zhu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China School of Electronic Information and Electrical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Regioregular poly(3-hexylthio)thiopene(P3HTT) has emerged tremendous potential in organic electronic applications due to the strong noncovalent interactions from the sulfur atom linked to thiophene. However, P3HTT generally exhibits low charge mobility mostly due to poor solution processability attributed to dense arrangement of hexylthio side chain in polymer, which led to strong noncovalent interactions among sulfur atoms. To balance the nonvalent interaction and aggregation for P3HTT, herein, we systematically study the effect of hexylthio side chain content in polymer backbone on the structure and properties. A series of regioregular P3HTT-based homopolymers(P3HTT, P3HTT-50,P3HTT-33 and P3HTT-25) were prepared via Kumada catalyst transfer polycondensation method from a set of mono-, bi-, ter-and quarterthiophenes containing different contents of hexylthio side chain. The DFT calculation shows the planarity of polymers backbone could be improved through reducing the density of hexylthio side chain in polymer mainchain. And significant changes in their crystallinity, aggregation and optical properties were observed with the content of hexylthio side chain reducing. The P3HTT-33 displayed the highest field-effect transistor hole mobility of 2.83×10^(-2) cm^(2)·V^(-1)·s^(-1) resulting from a balance between the crystallinity and planarity. This study demonstrates modulating the content of hexylthio side chain in P3HTT is an effective strategy to optimize the opto-electronic properties of polymer obtaining excellent semiconductor device performance.

关键词： Conjugated polymer Polythiophene Noncovalent interaction Molecular aggregation Organic field-effect transistor

DimRouter： A Multi-Mode Router Architecture for Higher Energy-Proportionality of On-Chip Networks

在线全文

学校读者我要写书评

暂无评论

Journal of Computer Science & Technology 2018年第5期33卷 984-997页

作者： Shi-Qi lian Ying Wang Yin-he han State Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China

In the dark silicon era, many independent components of many-core processors are becoming voluntarily inactive due to the constraint of power consumption on a chip. However, to keep network connectivity, the on-chip interconnection must still be kept activated and wastes considerable energy to avoid the isolation of these inactive components, harming the energy-proportionality of the whole processor chip. In this paper, we propose a novel design to provide more energy- proportional on-chip connection without damaging the network connectivity. To achieve this goal, we redesign the router architecture. The new architecture, DimRouter, supports three modes： normal, dark and dim. In the dim mode, only part of the router is active and provides flexible connection while the dark mode puts all router elements in the asleep state. Moreover, to maximize the number of dark routers, we also propose a reconfiguration algorithm based on degree-constrained Steiner Tree. The evaluation result under synthetic traffic shows that the new design can reduce the energy consumption up to 85% compared with the common design. For real application traffic, the new design can also save average 46% energy consumption with 4% performance improvement.

关键词： dark silicon energy-proportion power gating topology reconfiguration

A review on ignition mechanisms and characteristics of magnesium alloys

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

Journal of Magnesium and Alloys 2020年第2期8卷 329-344页

作者： Dong han Jin Zhang Jinfeng Huang Yong lian Guangyu he University of Science and Technology 30 Xueyuan RoadHaidian DistrictBeijing 100083PR China Science and Technology on Plasma Dynamics Laboratory Air Force Engineering UniversityXi'anShanxi 710038PR China

Magnesium alloys have become more attractive because of their low density and electromagnetic shielding effectiveness in the aerospace ***,some unpredictable situation may lead to the ignition of magnesium *** this review,the thermodynamic conditions and transfer processes of magnesium alloys ignition are analyzed from the point of *** criteria of ignition are *** addition,ignitability and flammability test systems are *** a more suitable method to assess the potential ignition and flammability risks of magnesium alloys in extreme environments is ***,the ignition characteristics of magnesium alloys are discussed in *** was found that the ignition of magnesium alloys is a complex process determined by internal properties such as thermo-physical properties,oxide film properties,chemical compositions and geometrical parameters,as well as the external environment such as gas species,oxygen concentration and oxygen *** temperature is not physical constants of *** is not simply assumed that ignition may occur when the temperature of Mg alloys reaches a certain ignition ***,the unsolved issues in the ignition of magnesium alloys are pointed out and the future investigation are suggested for improving the safety and reliability of magnesium alloys in the aerospace applications.

关键词： Magnesium alloys Ignition mechanisms Ignition characteristics

Underwater acoustic communication and the general performance evaluation criteria

在线全文

学校读者我要写书评

暂无评论

Frontiers of Information Technology & Electronic Engineering 2018年第8期19卷 951-971页

作者： Jian-guo HUANG han WANG Cheng-bing he Qun-fei ZhanG lian-you JING School of Marine Science and Technology Northwestern Polytechnical University School of Information and Communication Engineering Dalian University of Technology

Driven by the huge demand to explore oceans, underwater wireless communications have been rapidly developed in the past few decades. Due to the complex physical characteristics of water, acoustic wave is the only media available for underwater wireless communication at any distance. As a result, underwater acoustic communication(UAC) is the major research field in underwater wireless communication. In this paper, characteristics of underwater acoustic channels are first introduced and compared with terrestrial communication to demonstrate the difficulties in UAC research. To give a general impression of the UAC, current important research areas are mentioned. Furthermore, different principal modulation-based schemes for short-and medium-range communications with high data rates are investigated and summarized. To evaluate the performance of UAC systems in general,three criteria are presented based on the research publications and our years of experience in high-rate short-to medium-range communications. These three criteria provide useful tools to generally guide the design and evaluate the performance of underwater acoustic communication systems.

关键词： Underwater acoustic communication Underwater acoustic channels High data rate Communication range Bandwidth efficiency General evaluation criterion

High Damping and Mechanical Properties of Hydrogen-bonded Polyethylene Materials with Variable Contents of Hydroxyls:Effect of Hydrogen Bonding Density

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2017年第5期35卷 649-658页

作者： Lei Kan Xiao Ouyang Shan Gao Rui Li 马宁 Shi-hui han 魏浩 lian-he Liu College of Material Science and Chemical Engineering Harbin Engineering University

Hydrogen bonding is considered to have significant effect on the interaction between polymeric chains and on the viscoelasticity of the polymeric materials. In this paper, we attempt to discuss the relationship between hydrogen bonding density and damping behavior and mechanical properties of polyethylene-based polymeric materials. For this reason, a series of pendant chain hydrogen bonding polymers （PCHBP） with different hydrogen bonding density （HBD） were prepared by quantitatively changing the content of pendent hydroxyl groups on the main chain of polyethylene. It was found that PCItBP with low HBD showed similar properties to polyethylene, indicating that the property of the materials was dependent mainly on the structure of the main chain. However, PCHBP with high HBD exhibited two tandpeaks and a platform of loss modulus as well as a high storage modulus （about 400 MPa） at the second tand peak temperature, demonstrating that a polymeric material with high strength and damping properties was obtained. More importantly, the maximum of loss modulus showed a linear increase with the HBD, indicating that a higher HBD greatly improved the damping properties of the polymeric materials.

关键词： Hydroxyls Polyethylene Hydrogen bonding Polymer damping

Significantly improved photocatalysis-self-Fenton degradation performance over g-C3N4 via promoting Fe(Ⅲ)/Fe(Ⅱ)cycle

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2022年第7期41卷 2429-2438页

作者： Le Chen Xin-Xia he Ze-han Gong Jia-lian Li Yang Liao Xiao-Ting Li Jun Ma College of Chemistry and Materials Science Sichuan Normal UniversityChengdu 610068China Department of Science and Technology Sichuan Normal UniversityChengdu 610068China Key Laboratory of Land Resources Evaluation and Monitoring in Southwest Ministry of EducationChengdu 610068China

Photocatalysis-self-Fenton system,i.e.,photo-catalytic H_(2)O_(2)generation and utilization in situ for OH radials production to remove organic pollutants with high-fluent degradation and mineralization performance pos-sesses such advantages as cleanliness,efficiency and ***,its degradation activity always suffers from the Fe(Ⅲ)/Fe(Ⅱ)*** this reason,graphitic carbon interface-modified g-C_(3)N_(4)(CUCN)was fabricated to remarkably improve photocatalysis-self-Fenton degra-dation *** experiment results indicated that CUCN-2%photocatalyst,in which the loading percentage of graphitic carbon was 2%,demonstrated the optimum degradation performance among all the *** mineralization degree for RhB in 3 h over CUCN-2%reached 63.77%,nearly 3.35-fold higher than the pristine g-C_(3)N_(4).The significantly improved mineralization efficiency was ascribed to the promoted Fe(Ⅲ)/Fe(Ⅱ)cycle by photogenerated electrons,which leading to the higher utilization efficiency of H_(2)O_(2)through Fenton reaction,thereby producing more hydroxyl *** is anticipated that our work could provide new insights for the design of photocatalysis-self-Fenton system with exceptional degradation performance for actual photocat-alytic applications.

关键词： g-C_(3)N_(4) Photocatalysis-self-Fenton degradation Fe(Ⅲ)/Fe(Ⅱ)cycle Interface modification Graphitic carbon

Unveiling oscillatory nature for sustainable fuel production

在线全文

学校读者我要写书评

暂无评论

National Science Review 2024年第5期11卷 90-91页

作者： Ning han Ye Wang Bao-lian Su Department of Materials Engineering State Key Laboratory of Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materials National Engineering Laboratory for Green Chemical Productions of Alcohols Ethers and Esters College of Chemistry and Chemical Engineering Xiamen University Laboratory of Inorganic Materials Chemistry(CMI) University of Namur State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

A century ago, in 1923, Franz Fischer and hans Tropsch introduced the groundbreaking Fischer–Tropsch (FT) synthesis, a heterogeneous catalytic process used to convert synthesis gas (syngas,CO+H2) into multi-carbon hydrocarbons [1]. Over the past 100 years, FT synthesis has emerged as a pivotal method for converting non-petroleum resources into exceptionally clean fuels or valuable chemicals via syngas [2–4].

关键词： production nature fuel oscillatory sustainable unveiling

Remediation of nutrient-rich waters using the terrestrial plant, Pandanus amaryllifolius Roxb.

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2014年第2期26卷 404-414页

作者： Ping han Prakash Kumar Bee-lian Ong Singapore Delft Water Alliance National University of Singapore Department of Biological Sciences National University of Singapore

Effective control of eutrophication is generally established through the reduction of nutrient loading into waterways and water bodies. An economically viable and ecologically sustainable approach to nutrient pollution control could involve the integration of retention ponds, wetlands and greenways into water management systems. Plants not only play an invaluable role in the assimilation and removal of nutrients, but they also support fauna richness and can be aesthetically pleasing. Pandanus amaryllifolius, a tropical terrestrial plant, was found to establish well in hydrophytic conditions and was highly effective in remediating high nutrient levels in an aquatic environment showing 100% removal of NO^-N up to 200 mg/L in 14 days. Phosphate uptake by the plant was less efficient with 64% of the PO4-P removed at the maximum concentration of 100 mg/L at the end of 6 weeks. With its high NO^-N and PO43--P removal efficiency, P. amaryllifolius depleted the nutrient-rich media and markedly contained the natural colonization of algae. The impediment of algal growth led to improvements in the water quality with significant decreases in turbidity, pH and electrical conductivity. In addition, the plants did not show stress symptoms when grown in high nutrient levels as shown by the changes in their biomass, total soluble proteins and chlorophyll accumulation as well as photochemical efficiency. Thus, P. amaryUifolius is a potential candidate for the mitigation of nutrient pollution in phytoremediation systems in the tropics as the plant requires low maintenance, is tolerant to the natural variability of weather conditions and fluctuating hydro-periods, and exhibit good nutrient removal capabilities.

关键词： chlorophyll fluorescence nitrate and phosphate removal Pandanus amaryllifolius water quality

Cutting Force Fluctuation Suppression and Error Homogenization of Noncircular Gear Hobbing Based on the Tool Shifting Method

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2023年第4期36卷 167-179页

作者： Dazhu Li Jiang han Xiaoqing Tian lian Xia Institute of Artificial Intelligence Anhui Polytechnic UniversityWuhu 241000China CIMS Institute Hefei University of TechnologyHefei 230009China

The current research on noncircular hobbing mainly focuses on the linkage model and motion ***,the intermittent cutting characteristics of hobbing would increase uncertainties in the manufacturing *** this paper,a hobbing machining model with tool-shifting characteristics was proposed to solve the problems of cutting force fluctuation and inconsistency of tooth profile envelope accuracy at different positions of the pitch curve in noncircular gear *** on the unit cutting force coefficient method,the undeformed chip volume generated by interrupted cutting was used to characterize the fluctuation trend of the hobbing *** fluctuation characteristics of the cutting force generated by different hobbing models were compared and *** the equivalent gear tooth and hob slotting numbers,an analysis model of the tooth profile envelope error of the noncircular gear was ***,the tooth profile envelope errors at different positions of the pitch curve were compared and analyzed based on the constructed *** transmission structure of the electronic gearbox was constructed based on the proposed hobbing model,and the hobbing experiment was conducted based on the selfdeveloped noncircular gear CNC hobbing *** paper proposes a hobbing method that can effectively suppress the fluctuation of the peak and whole circumference cutting force and reduce the maximum envelope error of the whole circumference gear teeth.

关键词： Noncircular gear Gear hobbing Cutting force Envelope error Machining model