维普中文期刊产品整合服务
20篇 您的检索式:作者名="Mengdi Han"
    题名 作者 年代 出处 被引量
1Low-frequency wide-band hybrid energy harvester based on piezoelectric and triboelectric mechanism显示文摘Recently,hybrid energy harvester has been considered as an attractive potential approach to response the worldwide energy crisis due to the combination of advantages from different harvesting mechanism.In this paper,a novel low-frequency wide-band hybrid energy harvester based on piezoelectric and triboelectric mechanism is presented and systematically studied including structural design,fabrication process,working principle simulation and measurement.With a vibrational excitation,the polyvinylidene fluoride(PVDF) cantilevers will vibrate and impact the polydimethylsiloxane(PDMS) film on the substrate,producing a piezoelectric output as well as a triboelectric output.The structural parameters of each cantilever are optimized using finite element simulation,and the well-designed PVDF cantilevers with controllable PDMS mass not only reduce the device working frequency but also enlarge the bandwidth.Under a sweep-frequency test,three voltage peaks induced by the piezoelectric part are observed at 15,32.5 and 47.5 Hz,with the value of 320,288 and 264 mV,respectively.With the combined triboelectric part,a 20 V peak-peak voltage is generated at 15 Hz.The electrical driving ability of this hybrid energy harvester also has been demonstrated by lighting up a commercial light emitting diode(LED).HAN MengDi ZHANG XiaoSheng LIU Wen SUN XuMing PENG XuHua ZHANG HaiXia 2013Science China(Technological Sciences)2013,56,8:17
2Inorganic semiconducting materials for flexible and stretchable electronics显示文摘Recent progress in the synthesis and deterministic assembly of advanced classes of single crystalline inorganic semiconductor nanomaterial establishes a foundation for high-performance electronics on bendable,and even elastomeric,substrates.The results allow for classes of systems with capabilities that cannot be reproduced using conventional wafer-based technologies.Specifically,electronic devices that rely on the unusual shapes/forms/constructs of such semiconductors can offer mechanical properties,such as flexibility and stretchability,traditionally believed to be accessible only via comparatively low-performance organic materials,with superior operational features due to their excellent charge transport characteristics.Specifically,these approaches allow integration of high-performance electronic functionality onto various curvilinear shapes,with linear elastic mechanical responses to large strain deformations,of particular relevance in bio-integrated devices and bio-inspired designs.This review summarizes some recent progress in flexible electronics based on inorganic semiconductor nanomaterials,the key associated design strategies and examples of device components and modules with utility in biomedicine.Ki Jun Yu Zheng Yan Mengdi Han John A.Rogers 2017npj Flexible Electronics2017,1,1:14
3Low frequency wide bandwidth MEMS energy harvester based on spiral-shaped PVDF cantilever显示文摘In this paper,a piezoelectric energy harvester based on spiral-shaped polyvinylidene fluoride(PVDF)cantilever is designed and fabricated for harvesting low frequency vibration energy in the environment.In this design,the spiral-shaped PVDF cantilever is major for lowering the resonant frequency by increasing the length of the cantilever;Copper and silicon proof masses on both sides are working on further decreasing the resonant frequency and widen its bandwidth.Due to the high flexibility of the PVDF cantilever,this device is extremely sensitive to vibration and can harvest weak vibration energy.Both simulation and experimental results have approved that this device can operate at very low frequency which is about 20 Hz and can effectively harvest energy from 15–50 Hz.The peak of the output voltage can reach 1.8 V with the acceleration of 0.2 g.This is a promising harvester for powering the wireless sensors in the future.LIU Wen HAN MengDi MENG Bo SUN XuMing HUANG XianLiang ZHANG HaiXia 2014Science China(Technological Sciences)2014,57,6:13
4Self-Powered Intelligent Human-Machine Interaction for Handwriting Recognition显示文摘Handwritten signatures widely exist in our daily lives.The main challenge of signal recognition on handwriting is in the development of approaches to obtain information effectively.External mechanical signals can be easily detected by triboelectric nanogenerators which can provide immediate opportunities for building new types of active sensors capable of recording handwritten signals.In this work,we report an intelligent human-machine interaction interface based on a triboelectric nanogenerator.Using the horizontal-vertical symmetrical electrode array,the handwritten triboelectric signal can be recorded without external energy supply.Combined with supervised machine learning methods,it can successfully recognize handwritten English letters,Chinese characters,and Arabic numerals.The principal component analysis algorithm preprocesses the triboelectric signal data to reduce the complexity of the neural network in the machine learning process.Further,it can realize the anticounterfeiting recognition of writing habits by controlling the samples input to the neural network.The results show that the intelligent human-computer interaction interface has broad application prospects in signature security and humancomputer interaction.Hang Guo Ji Wan Haobin Wang Hanxiang Wu Chen Xu Liming Miao Mengdi Han Haixia Zhang 2021Research2021,,1:4
5Portable and wearable self-powered systems based on emerging energy harvesting technology显示文摘A self-powered system based on energy harvesting technology can be a potential candidate for solving the problem of supplying power to electronic devices. In this review, we focus on portable and wearable self-powered systems, starting with typical energy harvesting technology, and introduce portable and wearable self-powered systems with sensing functions. In addition, we demonstrate the potential of self-powered systems in actuation functions and the development of self-powered systems toward intelligent functions under the support of information processing and artificial intelligence technologies.Chen Xu Yu Song Mengdi Han Haixia Zhang 2021Microsystems & Nanoengineering2021,7,2:4
6A bifunctional MnO_x@PTFE catalytic membrane for efficient low temperature NO_x-SCR and dust removal显示文摘Low-temperature selective catalytic reduction of NOx combined with dust removal technique due to its energy conservation characteristic has been attracted much attention for fume purification.In this work,the MnOx wrapped PTFE membrane with efficient dust removal and low-temperature NH3-SCR has been prepared with a facile route.MnOxwith different crystal structures was uniformly grown around the PTFE fibrils through water bath.The flower-sphere-like MnOx@PTFE(O-MnOx@PTFE)and lamellar-interlaced ripple-like MnOx@PTFE(W-MnOx@PTFE)have large specific surface area which is favorable for enhancing catalytic performance.Also,the uniformly wrapped W-MnOxaround the PTFE fibrils optimized the pore structure for ultrafine dust capture.The membrane can almost 100%reject particles that are smaller than 1.0μm with a low filtration resistance.Meanwhile,W-MnOx@PTFE with more surface chemisorbed oxygen has the best NO conversion efficiency of 100%at a comparatively low and wide activity temperature window of 160–210°C,which is far to the thermal limitation of the PTFE.Therefore,this efficient and energy conserving membrane has a bright application prospects for tail gas treatment compared to the original treatment process.Shasha Feng Mengdi Zhou Feng Han Zhaoxiang Zhong Weihong Xing 2020Chinese Journal of Chemical Engineering2020,28,5:4
7A cubic triboelectric generator as a self-powered orientation sensor显示文摘Recently, triboelectric generator(TEG) has attracted a lot of attention due to its high output voltage and low-cost fabrication process. Here, a novel cubic TEG box is designed, which has separated electrodes on different surfaces. Thanks to the specially designed structure, it can scavenge vibration energy from all directions. Firstly the device is investigated through finite element method(FEM) simulation. Then the device is evaluated by experiments. The measuremental results show that this device can generate an amount of 25 n C charge during once shake by charging a 10 n F capacitor. Besides, an output voltage about 100 V is obtained, which is able to directly light up several light-emitting diodes(LEDs) simultaneously. At last, the device is utilized as a self-powered orientation sensor, which shows explicit directivity. This work extends the applications of TEG for ambient vibration energy harvesting techniques and the self-powered orientation sensor.QIU GuoLin LIU Wen HAN MengDi CHENG XiaoLiang MENG Bo SMITHA Ankanahalli Shankaregowda ZHAO JiangMing ZHANG HaiXia 2015Science China(Technological Sciences)2015,58,5:2
8Wearable and flexible electrochemical sensors for sweat analysis:a review显示文摘Flexible wearable sweat sensors allow continuous,real-time,noninvasive detection of sweat analytes,provide insight into human physiology at the molecular level,and have received significant attention for their promising applications in personalized health monitoring.Electrochemical sensors are the best choice for wearable sweat sensors due to their high performance,low cost,miniaturization,and wide applicability.Recent developments in soft microfluidics,multiplexed biosensing,energy harvesting devices,and materials have advanced the compatibility of wearable electrochemical sweat-sensing platforms.In this review,we summarize the potential of sweat for medical detection and methods for sweat stimulation and collection.This paper provides an overview of the components of wearable sweat sensors and recent developments in materials and power supply technologies and highlights some typical sensing platforms for different types of analytes.Finally,the paper ends with a discussion of the challenges and a view of the prospective development of this exciting field.Fupeng Gao Chunxiu Liu Lichao Zhang Tiezhu Liu Zheng Wang Zixuan Song Haoyuan Cai Zhen Fang Jiamin Chen Junbo Wang Mengdi Han Jun Wang Kai Lin Ruoyong Wang Mingxiao Li Qian Mei Xibo Ma Shuli Liang Guangyang Gou Ning Xue 2023Microsystems & Nanoengineering2023,9,1:2
9Investigation and characterization of an arc-shaped piezoelectric generator显示文摘A novel arc-shaped piezoelectric generator based on flexible PVDF thin film is presented and systemically studied.With a periodical external force,the generator can produce peak voltage of 45.6 V and peak power of 30.7μW.The maximum power density reaches 38.4μW/cm3with a 4 cm×2 cm×100μm device,at the optimum load resistance of 33.33 MOhm.The influence of frequency,size dimension and load resistance are investigated through experimental measurements.With this high output arc-shaped generator,capacitors can be effectively charged and three commercial LEDs have been directly lighted without any energy storage unit.HAN MengDi LIU Wen ZHANG XiaoSheng MENG Bo ZHANG HaiXia 2013Science China(Technological Sciences)2013,56,11:2
10Springless Cubic Harvester for Converting Three Dimensional Vibration Energy显示文摘Mengdi Han Wen Liu Bo Meng 2014International Conference on MEMS2014,,:1
11Propelling polysulfide redox by Fe_(3)C-FeN heterostructure@nitrogendoped carbon framework towards high-efficiency Li-S batteries显示文摘Lithium-sulfur(Li-S) batteries hold great promise in next-generation high-energy-density energy storage systems,but the intractable shuttle effect and the sluggish redox kinetics of polysulfides hinder the practical implementation of Li-S batteries.Here,heterostructured Fe_(3)C-FeN nanoparticles dotted in the threedimensional-ordered nitrogen-doped carbon framework(Fe_(3)C-FeN@NCF) were synthesized by molecular engineering combined with heterointerface engineering,and were applied to regulate the immobilization-diffusion-conversion behavior of polar polysulfides.It is experimentally and theoretically demonstrated that the heterointerface between Fe_(3)C and FeN exhibits high sulfiphilicity and high electronic/ionic conductivity,thus effectively capturing polysulfides and accelerating the bidirectional conversion of sulfur species.Meanwhile,the holey carbon framework functions as the scaffold to highly disperse binary nanoparticles,ensuring the sufficient exposure of active sites and the easy accessibility for lithium ions and electrons.By virtue of these synergistic merits,the Li-S batteries based on Fe_(3)CFeN@NCF-modified separators afford excellent electrochemical performances including a high rate capacity of 858 mA h g^(-1)at 2 C and a low capacity decay rate of 0.07% per cycle after 800 cycles at 1C This work provides inspiration for the design of heterostructured compounds and sheds light on the potential of heterostructure in high-efficiency Li-S batteries.Mengdi Zhang Jiawei Mu Yanan Li Yuanyuan Pan Zhiliang Dong Bei Chen Shiwei Guo Wenhan Yuan Haiqiu Fang Han Hu Mingbo Wu 2023Journal of Energy Chemistry2023,,3:1
12Erratum to:Nanomaterials based flexible devices for monitoring and treatment of cardiovascular diseases(CVDs)显示文摘Instead of 1 National Key Laboratory of Science and Technology on Micro/Nano Fabrication,School of Integrated Circuits,Peking University,Beijing 100871,China.Zehua Xiang Mengdi Han Haixia Zhang 2023Nano Research2023,16,5:1
13Toward photocatalytic hydrogen generation over BiVO_(4) by controlling particle size显示文摘Owing to excellent light absorption and high activity fo r oxygen evolution,monoclinic bismuth vanadate(BiVO_(4)) is regarded as an ideal candidate for photocatalytic water splitting.However,its application is limited by the large particle size in micrometer scale,as well as the slightly positive conduction band.In this work,we successfully synthesized nano-BiVO_(4) with particle size ranged from 27 nm to 57 nm by wet chemical method based on electrostatic spinning method.Unlike bulk BiVO_(4),the nano-sized BiVO_(4) possesses the ability to generate hydrogen by water splitting,and the activity could reach up to1.66 μmol h^(-1) g^(-1) with the assistance of Pt.The enhanced activity is mainly attributed to the improvements resulted from reduced particle size,which includes elevated conduction band,enlarged specific surface area and promoted charge separation.This work provides a simple method for synthesizing photocatalyst with small particle size and high yield.Mengdi Sun Zemin Zhang Qiujin Shi Jianlong Yang Mingzheng Xie Weihua Han 2021Chinese Chemical Letters2021,32,8:1
14Nanomaterials based flexible devices for monitoring and treatment of cardiovascular diseases(CVDs)显示文摘Cardiovascular diseases(CVDs)are one of the most serious diseases threatening human health in the world.Therefore,effective monitoring and treatment of CVDs are urgently needed.Compared with traditional rigid devices,nanomaterials based flexible devices open up new opportunities for further development beneficial from the unique properties of nanomaterials which contribute to excellent performance to better prevent and treat CVDs.This review summarizes recent advances of nanomaterials based flexible devices for the monitoring and treatment of CVDs.First,we review the outstanding characteristics of nanomaterials.Next,we introduce flexible devices based on nanomaterials for practical use in CVDs including in vivo,ex vivo,and in vitro methods.At last,we make a conclusion and discuss the further development needed for nanomaterials and monitoring and treatment devices to better care CVDs.Zehua Xiang Mengdi Han Haixia Zhang 2023Nano Research2023,16,3:0
15Kinetically accelerated and high-mass loaded lithium storage enabled by atomic iron embedded carbon nanofibers显示文摘Carbonaceous materials represent the dominant choice of materials for anodic lithium storage in many energy storage devices.Nevertheless,the nonpolar carbonaceous materials offer weak adsorption toward Li+that largely denies the high-rate Li+storage.Herein,the atomic Fe sites decorated carbon nanofibers(AICNFs)facilely produced by electrospinning are reported for kinetically accelerated Li+storage.Theoretical calculation reveals that the atomic Fe sites possess coordination unsaturated electronic configuration,enabling suitable bonding energy and facilitated diffusion path of Li+.As a result,the optimal structure displays a high capacitive contribution up to 95.9%at a scan rate of 2.0 mV·s^(−1).In addition,ultrahigh capacity retention of 97%is afforded after 5,000 cycles at a current density of 3 A·g^(−1).Moreover,the interlaced fiber structure enabled by electrospinning benefits structural stability and improved conductivity even at thick electrodes,thus allowing a high areal capacity of 1.76 mAh·cm−2 at a loading of 8 mg·cm−2.Because of these structure and performance merits,the lithium-ion capacitor containing the AICNF-based anode delivers a high energy density and large power density.Qian Xu Yanan Li Chenghao Wu Xitong Sun Qiang Li Huabin Zhang Le Yu Yuanyuan Pan Yujuan Wang Shiwei Guo Mengdi Zhang Han Hu Mingbo Wu 2022Nano Research2022,15,7:0
16Bioresorbable Multilayer Photonic Cavities as Temporary Implants for Tether-Free Measurements of Regional Tissue Temperatures显示文摘Objective and Impact Statement.Real-time monitoring of the temperatures of regional tissue microenvironments can serve as the diagnostic basis for treating various health conditions and diseases.Introduction.Traditional thermal sensors allow measurements at surfaces or at near-surface regions of the skin or of certain body cavities.Evaluations at depth require implanted devices connected to external readout electronics via physical interfaces that lead to risks for infection and movement constraints for the patient.Also,surgical extraction procedures after a period of need can introduce additional risks and costs.Methods.Here,we report a wireless,bioresorbable class of temperature sensor that exploits multilayer photonic cavities,for continuous optical measurements of regional,deep-tissue microenvironments over a timeframe of interest followed by complete clearance via natural body processes.Results.The designs decouple the influence of detection angle from temperature on the reflection spectra,to enable high accuracy in sensing,as supported by in vitro experiments and optical simulations.Studies with devices implanted into subcutaneous tissues of both awake,freely moving and asleep animal models illustrate the applicability of this technology for in vivo measurements.Conclusion.The results demonstrate the use of bioresorbable materials in advanced photonic structures with unique capabilities in tracking of thermal signatures of tissue microenvironments,with potential relevance to human healthcare.Wubin Bai Masahiro Irie Zhonghe Liu Haiwen Luan Daniel Franklin Khizar Nandoliya Hexia Guo Hao Zang Yang Weng Di Lu Di Wu Yixin Wu Joseph Song Mengdi Han Enming Song Yiyuan Yang Xuexian Chen Hangbo Zhao Wei Lu Giuditta Monti Iwona Stepien Irawati Kandela Chad R.Haney Changsheng Wu Sang Min Won Hanjun Ryu Alina Rwei Haixu Shen Jihye Kim Hong-Joon Yoon Wei Ouyang Yihan Liu Emily Suen Huang-yu Chen Jerry Okina Jushen Liang Yonggang Huang Guillermo A.Ameer Weidong Zhou John A.Rogers 2021Biomedical Engineering Frontiers2021,2,1:0
17A time sequential microfluid sensor with Tesla valve channels显示文摘The concentration of biomarkers in sweat can be used to evaluate human health,making efficient sweat sensing a focus of research.While flow channel design is often used to detect sweat velocity,it is rarely incorporated into the sensing of biomarkers,limiting the richness of sensing results.In this study,we report a time sequential sensing scheme for uric acid in sweat through a sequential design of Tesla valve channels.Graphene electrodes for detecting uric acid and directional Tesla valve flow channels were fabricated using laser engraving technology to realize time sequential sensing.The performance of the channels was verified through simulation.The time sequential detection of uric acid concentration in sweat can help researchers improve the establishment of human health management systems through flexible wearable devices.Pengcheng Zhao Haobin Wang Yaozheng Wang Wei Zhao Mengdi Han Haixia Zhang 2023Nano Research2023,16,9:0
18Integrated Women Framework,Meaning of Work,Personal Resilience,Hybrid Work,Well-Being,and Job Satisfaction:A Preliminary Study of Professional Women’s Work Experience in China显示文摘The purpose of the study is to propose a conceptual framework consisting of paths that contribute to job satisfaction of professional women in China.The preliminary study,which adopts the Integrated Women Fra mework,is intended to guide organizations and women professionals at work in China.The objectives of the study are:(1)to explore the nature and extent of relationships such as meaning of work,hybrid work environment,workplace policies,personal resilience,and job satisfaction;(2)to explore the application of the Integrated Women F ramework,as a mediator,in understanding and explaining the construct of job satisfaction and associated variables.More precisely,the present study aims(1)to explore the paths that lead to job satisfaction among working women,and(2)to understand job satisfaction to provide insight into how an organization can support and empower working women to achieve it.The framework“integrated women”(modified from an ideal type of construction coined by Lin and Moore in 1983)represents women with resilience to adversities and challenges,who have the ability to make informed choices between personal and professional aspects,to exercise their meaning/purpose at work,and manage flexibility in their work environment(e.g.,hybrid work).The study is both exploratory and explanatory.It uses the survey method for data collection.Women’s greater participation in the workforce has been an important step towards increasing workplace inclusion and gender equality.The study can be duplicated in other Asian regions and in the West since working women throughout the world share similar experiences.This study adopts a comprehensive approach to understanding and explaining the variables by combining both individual and contextual factors and their interactions.Based on this fram ework,the researchers made sure that all the variables are studied holistically so that the outcomes of this study will make substantial contributions to understanding of both theory(e.g.,resilience and job satisfaction)and workplace practices(e.g.,flexibility in the work environment).This paper focuses on the quantitative data derived from the China study of 152 subjects.Integrated Women Framew ork was used as a mediating variable in this study.In addition to descriptive data and correlation outcomes,the major findings from path analysis indicate that the mediating effects of integrated women were similar for the two outcomes of endogenous dependent variables:job satisfaction and well-being.For both,integrated women significantly mediated the relations between hybrid work and the outcomes,as well as the relations between personal resilience and the outcomes.In a nutshell,the preliminary analysis of the China data found that job satisfaction outcome is primarily affected by working women’s resilience in their work experience,a favorable work environment(work policies and hybrid work)and by their well-being(especially economic/financial well-being).In other words,job satisfaction is related to both personal and organizational factors.Hongmei Han Phylis Lan Lin Mengdi Liu Hui Zhang Keith Miller Liang Liu May Darli Phone Swe Kamaljit Grewall Maitra Vijayakumar Parameswaran Unnithan 2023US-China Education Review(B)2023,13,3:0
19Laser irradiation constructing all-in-one defective graphenepolyimide separator for effective restraint of lithium dendrites and shuttle effect显示文摘The commercialization of lithium-sulfur(Li-S)batteries faces several bottlenecks,and the major two of which are the shuttle effect of polysulfides and the wild growth of Li dendrites,responsible for fast capacity decay and severe safety issues.As an essential component of Li-S batteries,the structure and properties of the separators are closely related to the above problems,and the exploration of multifunctional separators is highly sought-after.Herein,an integrated separator composited of defective graphene and polyimide(DG-PI)was innovatively fabricated by electrospinning combined with the laser-induced carbonization strategy.The all-in-one compact architecture with well-interconnected channels shows superior mechanical and thermal stability and wettability.More importantly,the PI nanofibers containing N–/O–functional groups can induce the uniform deposition of lithium on the anode surface,while the DG framework with abundant pentagonal/heptagonal rings and vacancies can strongly trap polysulfides and accelerate polysulfide transformation on the cathode side.The strong chemical interaction between the insulative PI layer and the conductive DG layer modulates the surface charge distribution of each other,leading to more prominent contributions to restraining lithium dendrites and shuttle effect.Therefore,the Li-S batteries based on the integrated DG-PI separators afford an excellent performance in protecting lithium anode(stable cycles of 200 h at 5 mA·cm^(−2))and good cycling stability with a low capacity decay of 0.05%per cycle after 700 cycles at 1 C.This work offers a new design concept of multifunctional Li-S battery separators and broadens the application scope of laser micro-nano fabrication technology.Jiawei Mu Mengdi Zhang Yanan Li Zhiliang Dong Yuanyuan Pan Bei Chen Zhengqiu He Haiqiu Fang Shuoshuo Kong Xin Gu Han Hu Mingbo Wu 2023Nano Research2023,16,10:0
20Exploring the psychological impact of the 2022 SARS-CoV-2 Omicron variant outbreak in China显示文摘To the editor:The impact of the coronavirus disease 2019(COVID-19)pandemic in 2020 on mental health was substantialin Chinai2and various other countries.34 Beyond the direct consequences of COVID-19,the pandemic created an environment in which many determinants of mental health were affected.Issues associated with the pandemic,such as loss of livelihood,limited access to medical services,reduced social interactions,and economic downturn,could potentially have adverse effects on the population's mental well-being.5 In November 2021,the World Health Organization(WHO)designated the new variant of the severe acute respiratory syndrome coronavirus 2(SARS-CoV-2),variant B.1.1.529,as a variant of concern and named it Omicron;its rapid mutation and spread raised a new global health concern.Gangbin Han Guirong Cheng Feifei Hu Chunli Li Dan Liu Juan Zhou Jing Liu Linya Huang Xiaochang Liu Qianqian Nie Dan Song Deyang Zeng Lang Xu Jinquan Li Yushan Chen Zhen Wei Qiong Wu Xiaoming He Qingming Wu Wei Tan Yufei Mei Xingxing Chen Yangming Ou Jingjing ZhangYafu Yu Mengliu Yang Pengfei Lian Fukai Zhou Renjia Fan Hong Wan Chenlu Hu Yidi Fu Shiyue Li Junyi Wang Cheng Cai Mengdie Pei Yuyang Cui Wanying Cai Yiqing Li Shiyao Pan Chang Chen Yan He Zhaoxia Wu Liu Hu Liang Tao Hongyan Xiao Xinyan Xie Yan Zeng 2023General Psychiatry2023,36,6:0
返回顶部 每页显示:
共1页 首页 上一页 第1页 下一页 末页 /1 跳转

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1 渝公网安备 50019002500403号 违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费