|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Factors affecting proprioceptive recovery after anterior cruciate ligament reconstruction显示文摘背景 Proprioception 戏在在那里的膝 movements.Since 的一个重要角色是包围 proprioception 追随者外科的全面恢复时间的争吵,在以后,定义影响 proprioceptive 恢复的因素是必要的前面的十字形的系带( ACL )重建并且有他们的 ACL 的 36 个病人的一个总数与 semitendinosus/gracilis 接枝重建了调查在 proprioception 和肌肉 strength.Methods 之间的关系(重建的 group:6 | ZHOU Mou-wang GU Li CHEN Ya-ping YU Chang-long AO Ying-fang HUANG Hong-shi YANG Yan-yan | 2008 | Chinese Medical Journal2008，，22： | 22 |
| 2 | Two new terpenoids from fruits of Ziziphus jujuba显示文摘一新 ceanothane 类型 triterpene 和一新 sesquiterpene,和二,已知的 triterpenes 从 Ziziphus jujuba 米尔的水果被孤立。(Rhamnaceae ) 。基于光谱分析,二新混合物的结构作为 2 α 被阐明; -aldehydo-A(1)-norlup-20(29)-en-27,28-dioic 酸(zizyberanal 酸)(1 ) ,和 zizyberanone (2 ) 。当二已知的 triterpenes 作为 zizyberanalic 酸(3 ) 和 ursolic 酸(4 ) 被识别时。 | Sheng Guo Yu Ping Tang Jin Ao Duan Shu Lan Su An Wei Ding | 2009 | Chinese Chemical Letters2009，20，2： | 13 |
| 3 | New prospecting progress using information and big data of coal and oil exploration holes on sandstone-type uranium deposit in North China显示文摘1.Objective A series of Mesozoic-Cenozoic continental sedimentary basins exist in North China,coexisting with coal,oil/gas,and salt resources.Many previous drilling projects have been conducted within these basins to explore coal,petroleum,and mineral resources,however,these data have not been integrated due to different industries owners.In order to efficiently explore the large-sized,easily extracted,and environmentally friendly,sandstone-type uranium deposits,previous coal and oil exploration drilling-hole data are systematically collected, processed,and analyzed to improve the sandstone-type uranium prospecting exploitation.At the same time,we also discussed the uranium source,ore-forming process and model for the sandstone-type uranium deposits. | Ruo-shi Jin Pei-sen Miao Xian-zhang Sima Reng-An Yu Yin-hang Cheng Chao Tang Tian-fu Zhang Cong Ao Xue-ming Teng | 2018 | China Geology2018，1，1： | 12 |
| 4 | Second-look arthroscopic evaluation of the articular cartilage after primary single-bundle and double-bundle anterior cruciate ligament reconstructions显示文摘在前面的十字形的系带( ACL ) reconstruction.No 报告关于比较变化在以后的软骨被出版了以后,背景几报告显示出关节的软骨退化的前进单个捆( SB )并且这研究的双捆( DB ) ACL reconstructions.The 目的是在 SB 和 DB ACL 以后评估关节的软骨变化由收到了 arthroscopic ACL 重建的 99 个病人回顾地是的秒看 arthroscopy.Methods | WANG Hai-jun AO Ying-fang CHEN Lian-xu GONG Xi WANG Yong-jian MA Yong LEUNG Kevin Kar Ming YU Jia-kuo | 2011 | Chinese Medical Journal2011，，21： | 12 |
| 5 | Water regime-nitrogen fertilizer incorporation interaction:Field study on methane and nitrous oxide emissions from a rice agroecosystem in Harbin, China显示文摘Water regime and nitrogen(N) fertilizer are two important factors impacting greenhouse gases(GHG) emission from paddy field, whereas their effects have not been well studied in cold region. In this study, we conducted a two-year field experiment to study the impacts of water regime and N fertilizer on rice yields and GHG emissions in Harbin, China, a cold region located in high latitudes. Our results showed that intermittent irrigation significantly decreased methane(CH_4) emission compared with continuous flooding, however,the decrement was far lower than the global average level. The N_2O emissions were very small when flooded but peaked at the beginning of the disappearance of floodwater. The N fertilizer treatments increased CH_4 emissions at low level(75 kg N/ha). But both CH_4 and N_2O emissions were uninfluenced at the levels of 150 kg N/ha and 225 kg N/ha. Rice yields increased under intermittent irrigation and were highest at the level of 150 kg N/ha. From our results, we recommended that the intermittent irrigation and 150 kg N/ha as the ideal water regime-nitrogen fertilizer incorporation for this area to achieve low GHG emissions without impacting rice yields. | Wenjun Dong Jia Guo Lijun Xu Zhifeng Song Jun Zhang Ao Tang Xijuan Zhang Chunxu Leng Youhong Liu Lianmin Wang Lizhi Wang Yang Yu Zhongliang Yang Yilei Yu Ying Meng Yongcai Lai | 2018 | Journal of Environmental Sciences2018，30，2： | 12 |
| 6 | Failed anterior cruciate ligament reconstruction: analysis of factors leading to instability after primary surgery显示文摘 | MA Yong AO Ying-fang YU Jia-kuo DAI Ling-hui SHAO Zhen-xing | 2013 | Chinese Medical Journal2013，，2： | 11 |
| 7 | Vegetation dynamics induced by groundwater fluctuations in the lower Heihe River Basin,northwestern China显示文摘Aims Since 2000,the environmental flow controls project has been implemented in the lower Heihe River Basin,a typical arid inland river basin in northwest China,to restore the deteriorated ecological environment in this region.The aim of this study was to explore the impacts of groundwater fluctuations on vegetation dynamics.Our results can be used as a reference for water resources planning and management to maintain proper environmental flows in arid areas.Methods The location(by Global Positioning System)and depth of the monitoring wells,as well as groundwater table depth and salinity were measured in situ at each site from July to August 2009.Based on the measurements of the groundwater table depth and salinity following the implementation of environmental flow controls project(EFCP)in the lower Heihe River Basin,the groundwater fluctuations during the period from 2001 to 2009 were analyzed.Descriptive statistics and Pearson’s correlation were used to analyze the relationship between vegetation changes and groundwater table fluctuations.Additionally,the spatial distributions of the groundwater table depth and salinity were interpolated using the simple kriging method.Trend analysis was applied to the time series of integrated Moderate Resolution Imaging Spectroradiometer normalized difference vegetation index data to identify interannual vegetation dynamics.The relationship between vegetation status and groundwater environment was investigated at different spatial scales by analyzing and comparing the time series and trends.Important Findings(i)The groundwater table and salinity increased significantly in most of the study area with spatial heterogeneity.On average,the groundwater table rose;0.5 and 1.5 m in the upper and lower Ejina Basin,respectively,and the groundwater salinity increased across the study area by 0–4%.(ii)A notable correlation between the vegetation status and the groundwater table was revealed when the groundwater table depth fluctuated between 1.8 and 3.5 m,whereas the vegetation did not show an obvious response to groundwater table changes when the groundwater table depth was more than 5–6 m.(iii)Vegetation restoration mainly occurred in riparian areas within 500–1000 m of from natural rivers,where the groundwater table depth varied from 2 to 4 m,and salinity was<5%,whereas vegetation degradation appeared at some locations where groundwater environment had deteriorated. | Ping Wang Yichi Zhang Jingjie Yu Guobin Fu Fei Ao | 2011 | Journal of Plant Ecology2011，4，1： | 10 |
| 8 | Cytocompatibility with osteogenic cells and enhanced in vivo anti-infection potential of quaternized chitosan-loaded titania nanotubes显示文摘Infection is one of the major causes of failure of orthopedic implants. Our previous study demonstrated that nanotube modification of the implant surface, together with nanotubes loaded with quaternized chitosan(hydroxypropyltrimethyl ammonium chloride chitosan, HACC), could effectively inhibit bacterial adherence and biofilm formation in vitro. Therefore, the aim of this study was to further investigate the in vitro cytocompatibility with osteogenic cells and the in vivo anti-infection activity of titanium implants with HACC-loaded nanotubes(NT-H). The titanium implant(Ti), nanotubes without polymer loading(NT), and nanotubes loaded with chitosan(NT-C) were fabricated and served as controls. Firstly, we evaluated the cytocompatibility of these specimens with human bone marrow-derived mesenchymal stem cells in vitro.The observation of cell attachment, proliferation, spreading, and viability in vitro showed that NT-H has improved osteogenic activity compared with Ti and NT-C. A prophylaxis rat model with implantation in the femoral medullary cavity and inoculation with methicillin-resistant Staphylococcus aureus was established and evaluated by radiographical, microbiological, and histopathological assessments. Our in vivo study demonstrated that NT-H coatings exhibited significant anti-infection capability compared with the Ti and NT-C groups. In conclusion, HACC-loaded nanotubes fabricated on a titanium substrate show good compatibility with osteogenic cells and enhanced anti-infection ability in vivo, providing a good foundation for clinical application to combat orthopedic implant-associated infections. | Ying Yang Haiyong Ao Yugang Wang Wentao Lin Shengbing Yang Shuhong Zhang Zhifeng Yu Tingting Tang | 2016 | Bone Research2016，4，3： | 9 |
| 9 | Original article: Arthroscopic treatment for osteochondral lesions of the talus: analysis of outcome predictors显示文摘背景与传统的关节切开术过程相比,为距骨的 osteochondral 损害的 arthroscopic 治疗有一些优点。然而,关于为这种外科的技术的结果预言者有可观的争论。这研究试图为距骨的 osteochondral 损害调查 arthroscopic 治疗的结果,并且分析它的结果 predictors.Methods 经历了脚关节 arthroscopy 的有距骨的 osteochondral 损害的 48 个病人的临床的数据被学习。Arthroscopic 清创术在所有病人上被执行,并且 microfracture 也在 36 种情况中被执行。一张主观满足问询表,为疼痛的视觉模拟规模(管) ,和美国矫形的脚与脚关节社会(AOFAS ) 脚关节上的分数和 hindfoot 分数在五个病人失去了列在后面起来的 surgery.Results 前后被获得。另外的 43 个病人,其中 8 个是运动员,被跟随在上面为 23.9 个月的一般水准。平均 AOFAS 手术后的分数是 90.16 ??????? 贼 ? 贼吗?? | GUO Qin-wei HU Yue-lin JIAO Chen YU Chang-long AO Ying-fang | 2010 | Chinese Medical Journal2010，，3： | 9 |
| 10 | Effect of Interaction of Non-residual Fractions on Adsorption of Atrazine onto Surficial Sediments and Natural Surface Coating Samples显示文摘To quantify the effect of the interaction of non-residual fractions[Fe oxides(Fe), Mn oxide(Mn), organic materials(OMs)] in the surficial sediments and the natural surface coating samples on the adsorption of atrazine(AT), an AT multiple regression adsorption model(AT-MRAM) was developed. The AT-MRAM improves upon the previous AT additional adsorption model(AT-AAM) with superior goodness-of-fit test(adjusted R2=ca.1.000), F-test and t-test(P<0.01), and reveals the effect of the interaction among the components in the surficial sediments(SSs) and na- tural surface coatings samples(NSCSs) on the adsorption of AT, which was neglected by the AT-AAM. Meanwhile, the AT-MRAM was also verified through adsorption experiments of AT and the relative deviation between predicted maximum adsorption of AT and the experimental one is less than 15%. The resulted information shows that Mn is prone to interact with other non-residual components, the total maximum adsorption of AT is inversly proportional to the level of Mn, and Fe and OMs facilitate the adsorption of AT. The results also indicate that the adsorption of AT is not only dominated by Fe, OMs, Fe/OMs, but also restrained by Fe/Mn, Fe/Mn/OMs, with lesser roles attributed to Mn, and the estimated AT distributions among the components do not agree with that previously predicted by the AT-AAM, especially with the relative contribution of Mn to the adsorption of AT, revealing significant contribution of the interactions among non-residual components in controlling the behavior of AT in aquatic environments. | LI Yu LI Shan-shan GAO Qian WANG Ao | 2011 | Chemical Research in Chinese Universities2011，27，2： | 9 |
| 11 | Clinical evaluation of double-bundle anterior cruciate ligament reconstruction procedure using hamstring tendon grafts: a prospective, randomized and controlled study显示文摘在在那里的临床的研究的背景仍然是很多争吵关于增加了在双捆(DB ) 之间的前面、旋转的稳定性并且单个捆(SB ) 前面的十字形的系带(ACL ) 重建。这研究的目的是评估有到 2006 年 5 月的从 2005 年 5 月的 ACL 破裂的 64 个连续病人随机被分配进二个组的四隧道的 DB ACL reconstruction.Methods 的临床的结果:为 SB ACL 重建的 32 个盒子和为 DB ACL 重建的 32 个盒子。临床的数据,包括的 KT 2000, Biodex 测试, Lysholm 分数, Tegner 分数和 IKDC 得分,有希望地被收集直到一般水准 KT 2000 珍视的至少 10 月 post-operative.Results 是(1. | WANG Jian-quan AO Ying-fang YU Chang-long LIU Ping XU Yan CHEN Lin-xin | 2009 | Chinese Medical Journal2009，，6： | 8 |
| 12 | Aging characteristic of Cu-0.6Cr-0.15Zr-0.05Mg-0.02Si alloy containing trace rare earth yttrium显示文摘The aging characteristic of Cu-0.6Cr-0.15Zr-0.05Mg-0.02Si alloy containing trace rare earth yttrium was investigated. The results showed that Cu-0.6Cr-0.15Zr-0.05Mg-0.02Si alloy obtained good comprehensive performance after 80% rolling and then aging at 480℃ for 1 h; the hardness and electrical conductivity reached HV 150 and 85.5% IACS, respectively. Increasing aging temperature accelerated aging precipitation. The time for attaining peak hardness was postponed, the precipitates were finer (2-4 nm), and the interparticle spacing was shorter due to yttrium addition. The hardness and electrical conductivity of the Y-containing alloy after 80% deformation and then aging at 480℃ for 45 min reached HV 174 and 82.1% IACS, respectively. | YU Fangxin CHENG Jianyi AO Xuewen | 2011 | Rare Metals2011，30，5： | 8 |
| 13 | Measurement of Atrazine Adsorption onto Surficial Sediments(Natural Surface Coatings)——New Evidence for the Importance of Fe Oxides显示文摘To reveal the relative contribution of the components,Fe,Mn oxides or organic materials(OMs) in the surficial sediments(SSs),and the natural surface coating samples(NSCSs) to adsorbing atrazine(AT),a selective chemical extraction technique was employed,to remove the different components,and the adsorption characteristics of AT on the SSs and the NSCSs were investigated.The observed adsorptions of AT on the original and extracted SSs and NSCSs were analyzed by nonlinear least squares fitting(NLSF) to estimate the relative contribution of the com-ponents.The results showed that the maximum adsorption of AT on the NSCSs was greater than that in the SSs,be-fore and after extraction treatments,implying that the NSCSs were more dominant than the SSs for organic pollutant adsorption.It was also found that the Fe oxides,OMs,and residues in SSs(NSCSs) facilitated the adsorption of AT,but Mn oxides directly or indirectly restrained the interaction of AT with SSs(NSCSs) particles.The contribution of the Fe oxides to AT adsorption was more than that of OMs;the greatest contribution to AT adsorption on a molar ba-sis was from the Fe oxides in the nonresidual fractions,indicating that the Fe oxides played an important role in con-trolling the environmental behavior of AT in an aquatic environment. | LI Yu WANG Ao GAO Qian WANG Xiao-li | 2009 | Chemical Research in Chinese Universities2009，25，1： | 7 |
| 14 | Study on the Retention Rate of Green Tea Catechins Components and Tea Polyphenol by Different Processing Technology显示文摘The aim of this research was to explore the effect of fixation,rolling,and drying processing technology on the retention rate of green tea catechins components and tea polyphenol.Different fixation processes(rotary drumfiring,microwave,steam-blasting),rolling process(weight of rolling,gently press rolling and traditional rolling),drying process(stove drying,roasting dehydration,baked fried drying) were adopted.The effect of different tea processing technology on the retention rate of catechins component and tea polyphenol was analyzed.It showed that the microwave fixation process,gently press rolling process,baked fried dry process were beneficial to keep high levels of EGCG,C,EGC,EC,ECG. | Hong-Chun Cui Jian-Yong Zhang Ji-Zhong Yu Xu-Xia Zheng Cun Ao Yu-Xiao Mao | 2013 | 茶叶2013，39，4： | 7 |
| 15 | News Keyword Extraction Algorithm Based on Semantic Clustering and Word Graph Model显示文摘The internet is an abundant source of news every day. Thus, efficient algorithms to extract keywords from the text are important to obtain information quickly. However, the precision and recall of mature keyword extraction algorithms need improvement. TextRank, which is derived from the PageRank algorithm, uses word graphs to spread the weight of words. The keyword weight propagation in Text Rank focuses only on word frequency. To improve the performance of the algorithm, we propose Semantic Clustering TextRank(SCTR), a semantic clustering news keyword extraction algorithm based on TextRank. Firstly, the word vectors generated by the Bidirectional Encoder Representation from Transformers(BERT) model are used to perform k-means clustering to represent semantic clustering. Then, the clustering results are used to construct a TextRank weight transfer probability matrix. Finally,iterative calculation of word graphs and extraction of keywords are performed. The test target of this experiment is a Chinese news library. The results of the experiment conducted on this text set show that the SCTR algorithm has greater precision, recall, and F1 value than the traditional TextRank and Term Frequency-Inverse Document Frequency(TF-IDF) algorithms. | Ao Xiong Derong Liu Hongkang Tian Zhengyuan Liu Peng Yu Michel Kadoch | 2021 | Tsinghua Science and Technology2021，26，6： | 7 |
| 16 | An anatomical and histological study of human meniscal horn bony insertions and peri-meniscal attachments as a basis for meniscal transplantation显示文摘背景 Allograft meniscal 移植是为有新月缺乏的征兆的年轻病人的一种日益普及的治疗选择。然而,许多问题仍然包围它。在这研究,我们学习了解剖地点和人的 meniscal 角的组织学的结构多骨的插入并且 22 新鲜结冰成年人死尸膝被把基于 meniscal allograft transplantation.Methods 观察 peri-meniscal 附件的解剖形态学和 histomorphology。前面的 meniscal 和以后的角的地点到胫骨的多骨的插入被测量。peri-meniscal 附件的解剖形态学被观察并且 meniscal 角的组织学的结构多骨的插入和 peri-meniscal 附件被学习由他 staining.Results 前面的角中间的新月的多骨的插入(9. | WANG Yong-jian YU Jia-kuo LUO Hao YU Chang-long AO Ying-fang XIE Xing JIANG Dong ZHANG Ji-ying | 2009 | Chinese Medical Journal2009，，5： | 6 |
| 17 | Synergetic and Antagonistic Effects of Cadmium on Adsorption of Atrazine on Surficial Sediments显示文摘Co-contamination of atrazine(AT) and cadmium(Cd) on the surficial sediments(SSs) and natural suface coating samples(NSCSs) was investigated via thermodynamic adsorption experiments. The results show that surface coatings have a stronger ability to adsorb AT owing to their higher active components compared with surficial sediments. Synergetic and antagonistic effects of Cd on the adsorption of AT were observed. Cd at a lower concentra- tion(≤4.0 mg/L) in the solid/liquid phase enhanced AT adsorption onto the surficial sediments(surface coatings), while the adsorption of AT would be inhibited at a Cd concentration of more than 8.0 mg/L: AT coordinates strongly to Cd, and AT-Cd complexes seem to be more strongly adsorbed on sediments than AT alone, and at the adsorption of AT can take place on the sites where Cd has been previously adsorbed and Cd acts as a bridge for the interaction between sediments and AT. With the increase of Cd concentration, the superfluous Cd may hold much more adsorption sites and thus inhibits the adsorption of AT. Meanwhile, the effects of co-existed AT on Cd adsorption on SSs(NSCSs) were insignificant since Cd has a stronger competitive ability to be absorbed on SSs(NSCSs). The present study could be useful in predicting interactions of the metal ions with herbicides and potentially aid the design of remediation strategies for contaminated sediments and groundwater. | LI Yu GAO Qian WANG Xiao-li DONG De-ming WANG Ao | 2009 | Chemical Research in Chinese Universities2009，25，2： | 6 |
| 18 | Pathological changes in the lungs and lymphatic organs of 12 COVID-19 autopsy cases显示文摘Systematic autopsy and comprehensive pathological analyses of COVID-19 decedents should provide insights into the disease characteristics and facilitate the development of novel therapeutics.In this study,we report the autopsy findings from the lungs and lymphatic organs of 12 COVID-19 decedents—findings that evaluated histopathological changes;immune cell signature and inflammatory factor expression in the lungs,spleen and lymph nodes.Here we show that the major pulmonary alterations included diffuse alveolar damage,interstitial fibrosis and exudative inflammation featured with extensive serous and fibrin exudates,macrophage infiltration and abundant production of inflammatory factors(IL-6,IP-10,TNFo?and IL-I f).The spleen and hilar lymph nodes contained lesions with tissue structure disruption and immune cell dysregulation,including lymphopenia and macrophage accumulation.These findings provide pathological evidence that links injuries of the lungs and lymphatic organs with the fatal systematic respiratory and immune malfunction in critically ill COVID-19 patients. | Qian Liu Yu Shi Jun Cai Yaqi Duan Rongshuai Wang Hongyan Zhang Qiurong Ruan Jiansha Li Lei Zhao Yifang Ping Rong Chen Liang Ren Xiaochun Fei Heng Zhang Rui Tang Xi Wang Tao Luo Xindong Liu Xuequan Huang Zhenhua Liu Qilin Ao Yong Ren Jing Xiong Zhicheng He Haibo Wu Wenjuan Fu Pengnan Zhao Xinwei Chen Guoqiang Qu Yunyun Wang Xi Wang Jia Liu Dongfang Xiang Sanpeng Xu Xiaowei Zhou Qingrui Li Jinghong Ma Heng Li Jie Zhang Sizhe Huang Xiaohong Yao Yiwu Zhou Chaofu Wang Dingyu Zhang Guoping Wang Liang Liu Xiu-Wu Bian | 2020 | National Science Review2020，7，12： | 6 |
| 19 | Blockchain-Based Secure Distributed Control for Software Defined Optical Networking显示文摘Software defined optical networking(SDON)is a critical technology for the next generation network with the advantages of programmable control and etc.As one of the key issues of SDON,the security of control plane has also received extensive attention,especially in certain network scenarios with high security requirement.Due to the existence of vulnerabilities and heavy overhead,the existing firewalls and distributed control technologies cannot solve the control plane security problem well.In this paper,we propose a distributed control architecture for SDON using the blockchain technique(BlockCtrl).The proposed BlockCtrl model introduces the advantages of blockchain into SDON to achieve a high-efficiency fault tolerant control.We have evaluated the performance of our proposed architecture and compared it to the existing models with respect to various metrics including processing rate,recovery latency and etc.The numerical results show that the BlockCtrl is capable of attacks detection and fault tolerant control in SDON with high performance on resource utilization and service correlation. | Hui Yang Yongshen Liang Qiuyan Yao Shaoyong Guo Ao Yu Jie Zhang | 2019 | China Communications2019，16，6： | 5 |
| 20 | AI_4C_3 Hydration Thermochemical Analysis for Burned Carbon-containing Refractories with Al显示文摘In this paper, X-ray diffractogram analysis and SEM observation of Al4 C3 formed at high temperature from carbon-containing refractories with Al have been carried out.Aluminum added to carbon-containing refractories reacts with C(s)to form Al4 C3(s) gradually during heating from 600 ℃ to 1200℃.It is considered that the interlocked structure of Al4 C3 plate crystals promotes the outstanding increase of hot modulus of rupture of carbon-containing refractories with Al. The HMOR of carbon-containing refractories added with Al additive from 0 to 5wt% increases by 2.8 times being from 6.5MPa to 18.2MPa.After a thermochemical calculation for hydration reaction processes of Al4 C3 and H2O(g), the equilibrium partial pressure chart of H2O(g)in H2O-Al4C3-Al(OH)3 system vs various temperatures has been attained . The H2O (g) partial pressure in the air needed for the Al4 C3 hydration reaction is no more than 10~18 atm at the temperature below 120℃.It is considered that the burned carbon-containing refractories with Al is extremely easy to hydrate and the cracking of burned carbon-containing refractories is generated because that the hydration expansion is 2.11 times during transforming from Al4 C3 to Al(OH)3.The fundamental measure against hydration of the refractories is to insulate the refractories from H2O(g)by various means such as pitch impregnation or other sealing materials. | YANG Ding’ao, YU Zhiming and FAN Liuwu( Sanmenxia Polytechnic College, Sanmenxia, Henan 472000, China ) | 2003 | China's Refractories2003，12，1： | 5 |
您所在的机构暂未开通此部分的功能，请联系管理员