|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Virtual simulation analysis and verification of seed-filling mechanism for dipper hill-drop precision direct rice seeder显示文摘In order to improve the seeder’seed-filling ability of the dipper hill-drop precision direct rice seeder,and to meet the mechanization requirement of high speed operation,the self-designed seeder was taken as the objective to explore its seed-filling mechanism and the movement status of rice seed in seed box from the perspective of mechanics.The force models of seed-filling process by dipper were established,and the influential regularity of its rotation speed to compressive resistance of seed population was analyzed as well.The image processing Module-Clipping of discrete element simulation software EDEM was used in the virtual simulation analysis for the process of the seed filling into the dipper,and the velocity relation curve and the force changing curve between rotation speed and seeds were obtained.According to the virtual experiment,the composite filling force of seeds,i.e.the qualified rate on filled rice seed amounts was the largest when rotation speed was at 40 r/min.The performance test bed of seeder was used to verify the simulation results,in which the qualified rate on scooped rice seed amounts was taken as the index,and six rotation speeds of seed-filling dipper were also selected for analysis of seed-filling ability of the device.The results are as follows:with the increase of working speed,the qualified rate on filled rice seed amounts fluctuated with a trend of cosine curve,the largest value was 94.16%occurred when the rotation speed of seed-filling dipper was at 40 r/min.The variation trend of simulation value was approximately consistent with that of verification value.The study can provide a reference for the research and development of mechanical seeder. | Wang Jinwu Zhou Wenqi Tian Liquan Li Shuwei Zhang Zhao | 2017 | International Journal of Agricultural and Biological Engineering2017，10，6： | 7 |
| 2 | Heavy mineral assemblage characteristics and the Cenozoic paleogeographic evolution in southwestern Qaidam Basin显示文摘Based on the analysis of heavy mineral assemblages in Cenozoic southwestern Qaidam Basin, we found that different areas have variable heavy mineral assemblage characteristics, which suggested that there were two source areas—the Altyn Mountains and the Qimen Tagh-East Kunlun Mountains. In Ganchaigou-Shizigou-Huatugou(Area A), which was mainly source from the Altyn Mountains, its heavy minerals were mainly composed of zircon, Ti-oxides, and wollastonite in the Paleoceneearly Eocene and mainly of unstable minerals, especially amphibole, in the middle Eocene-Oligene. Since the late OligoceneMiocene, the heavy minerals were still mainly unstable minerals, but the content of epidote increased and the content of amphibole decreased. In Qigequan-Hongliuquan(Area B), which was the mixed source from the Altyn Mountains and the Qimen Tagh-East Kunlun Mountains, its heavy minerals were mainly garnet, epidote, and amphibole. The source of LücaotanDongchaishan-Kunbei(Area C) was mainly from the Qimen Tagh-East Kunlun Mountains, heavy minerals in the sediments in Area C were mainly zircon and Ti-oxides in Paleogene and garnet, epidote, and amphibole in Neogene. In Yuejin-Youshashan(Area D), where the stable minerals and unstable minerals were present simultaneously, the heavy mineral assemblages was controlled by multi-direction source. The variation of heavy mineral assemblages in southwestern Qaidam Basin shows that Altyn Mountains was of low-lying topographic relief in Paleocene-early Eocene, and the rapid uplift of Altyn Mountains started from the middle Eocene. In Paleogene, the Altyn Tagh Fault had a slow strike-slip velocity, but the strike-slip velocity increased greatly since the late Oligocene, leading to a strike-slip displacement above 300 km since Neogene. Meanwhile, the Qimen Tagh-East Kunlun fault zone was under a stable tectonic stage in Paleogene with the Qimen Tagh Mountain being lowlying hills; since the late Oligocene, the fault zone started to activate and the Qimen Tagh Mountain began to uplift rapidly. | LI LinLin GUO ZhaoJie GUAN ShuWei ZHOU SuPing WANG MingZhen FANG YaNan ZHANG ChenChen | 2015 | Science China Earth Sciences2015，58，6： | 6 |
| 3 | Template-free synthesis of three-dimensional NiFe-LDH hollow microsphere with enhanced OER performance in alkaline media显示文摘Flower-like hierarchical three-dimensional Ni Fe layered double hydroxides hollow microspheres(3D NiFe-LDH HMS),as one kind of novel non-noble metal electrocatalysts,have been fabricated in a templatefree route for water oxidation.Both of the concentration of ammonium fluoride and the reaction time are adjusted to obtain a series of Ni Fe-LDH microspheres,with different internal structures from massive to hollow generated during the hydrothermal treatment,which improve the electrocatalytic activity of the Ni Fe-LDH catalysts towards the evolution reaction of oxygen.The optimized Ni Fe-LDH-0.4M HMS show the excellent OER performance in alkaline electrolyte withη=290 mV@10 mA cm^-2,and a Tafel slope of 51 mV dec-1,which outperforms the benchmark RuO2 catalyst.The possible reason is attributed to the more exposure of active sites,and fast ion transport resulting from the hierarchical hollow structure. | Haihong Zhong Tongyuan Liu Shuwei Zhang Dianqing Li Pinggui Tang Nicolas Alonso-Vante Yongjun Feng | 2019 | Journal of Energy Chemistry2019，28，6： | 5 |
| 4 | Porphyromonas gingivalis exacerbates ulcerative colitis via Porphyromonas gingivalis peptidylarginine deiminase显示文摘Abstract:Ulcerative Colitis(UC)has been reported to be related to Porphyromonas gingivalis(P.gingivalis).Porphyromonas gingivalis peptidylarginine deiminase(PPAD),a virulence factor released by P.gingivalis,is known to induce inflammatory responses.To explore the pathological relationships between PPAD and UC,we used homologous recombination technology to construct a P.gingivalis strain in which the PPAD gene was deleted(Δppad)and aΔppad strain in which the PPAD gene was restored(comΔppad).C57 BL/6 mice were orally gavaged with saline,P.gingivalis,Δppad,or comΔppad twice a week for the entire 40 days(days 0-40),and then,UC was induced by dextran sodium sulfate(DSS)solution for 10 days(days 31-40).P.gingivalis and comΔppad exacerbated DDS-induced colitis,which was determined by assessing the parameters of colon length,disease activity index,and histological activity index,butΔppad failed to exacerbate DDS-induced colitis.Flow cytometry and ELISA revealed that compared withΔppad,P.gingivalis,and comΔppad increased T helper 17(Th17)cell numbers and interleukin(IL)-17 production but decreased regulatory T cells(Tregs)numbers and IL-10 production in the spleens of mice with UC.We also cocultured P.gingivalis,Δppad,or comΔppad with T lymphocytes in vitro and found that P.gingivalis and comΔppad significantly increased Th17 cell numbers and decreased Treg cell numbers.Immunofluorescence staining of colon tissue paraffin sections also confirmed these results.The results suggested that P.gingivalis exacerbated the severity of UC in part via PPAD. | Xida Zhao Jingbo Liu Chong Zhang Ning Yu Ze Lu Shuwei Zhang Yuchao Li Qian Li Junchao Liu Dongjuan Liu Yaping Pan | 2021 | International Journal of Oral Science2021，13，3： | 5 |
| 5 | Long-term follow-up for Shang Ring male circumcision显示文摘 | Cheng Yue Wu Kerong Yan Zejun Yang Shuwei Li Fang Su Xinjun | 2014 | Chinese Medical Journal2014，，10： | 4 |
| 6 | Advances in Understanding Materials for Rechargeable Lithium Batteries by Atomic Force Microscopy显示文摘The development of advanced lithium batteries represents a major technological challenge for the new century.Understanding the fundamental electrode degradation mechanisms is important for battery performance improvements.The complex electrochemical processes inside a working battery are being explored to a limited extent.Various advanced material characterization techniques have been used to monitor dynamic conditions for optimizing battery materials.State-of-the-art atomic force microscopy methods have been applied to energy storage systems,specifically lithium-ion batteries.Atomic force microscopy is an ideal tool to provide localized morphological,chemical,and physical information at nanoscale for the in-depth understanding of the electrochemical processes,reaction mechanisms,and degradation of battery materials.Here,we review recent progress in the development and application of atomic force microscopy for high-performance lithium-ion batteries.We discuss atomic force microscopy as an analytical tool to help researchers understand graphite,silicon,layered metal oxides,and other representative electrode materials.We summarize the importance of atomic force microscopy technique in studying the next-generation Li–S and Li–O 2 batteries.We also highlight some of the remaining challenges and possible solutions for future development. | Shuwei Wang Qi Liu Chenglong Zhao Fengzheng Lv Xianying Qin Hongda Du Feiyu Kang Baohua Li | 2018 | Energy & Environmental Materials2018，1，1： | 4 |
| 7 | Synthesis and characterization of triblock copolymer by combining enzymatic condensation polymerization and ATRP显示文摘The polyester poly(1,10-decanediol /1, 10-sebacate) (PSD) was synthesized by means of Novozyme 435 catalyzed condensation polymeriza- tion of 1,10-decanediol and 1,10-sebacic acid. Both hydroxyl chain ends of the resulting PSD were modi- fied by esterification with α-bromopropionyl bromide to obtain difunctional macroinitiator, which was sub- sequently used in the ATRP of S t using CuCl/2, 2′- bipyridine (bpy) as the catalyst system to afford the triblock copolymer, polystyrene-block-poly(1,10-dec- anediol/1,10-sebacate)-block-polystyrene (PS t-b-PSD- b-PSt). Molecular weight distribution and structure of the resulting triblock copolymer was confirmed by Waters 410 Gel permeation chromatography (GPC) and measurements of nuclear magnetic resonance (NMR) analysis. | LI Dongshuang SHA Ke LI Yapeng WANG Shuwei WANG Jingyuan | 2006 | Chinese Science Bulletin2006，51，9： | 3 |
| 8 | A Novel TiNi/AlSi Composite with High Strength and High Damping Capacity显示文摘A novel TiNi/AlSi composite with high compressive strength and high damping capacity was obtained by infiltrating Al-12%Si alloy into porous TiNi alloy.It had been found that the high compressive strength (440 MPa) of TiNi/AlSi composite is due to the increase of effective carrying area after infiltrating Al-12%Si alloy,while the high damping capacity is contributed to TiNi carcass,Al-12%Si filling material and micro- slipping at the interface. | Shuwei LIU Xiuyan LI Desheng YAN Haichang JIANG Lijian RONG | 2008 | Journal of Materials Science & Technology2008，24，6： | 3 |
| 9 | CsTCPs regulate shoot tip development and catechin biosynthesis in tea plant (Camellia sinensis)显示文摘The growth of leaves and biosynthesis of characteristic secondary metabolites are critically important for tea production and quality control.However,little is known about the coordinated regulation of leaf development and catechin biosynthesis in tea plants.Here,we reported that TCP TFs are involved in both catechin biosynthesis and leaf development.An integrated analysis of catechin profiling and CsTCP expression in different tissues of plants under various environmental conditions at different developmental stages indicated significant correlations between the transcript levels of CIN-type TCPs and catechin production.CIN-type CsTCP3 and CsTCP4 and PCF-type CsTCP14 interacted with the MYB-bHLH-WD40 repeat(MBW)complex by forming a CsTCP3-CsTT8 heterodimer and modulating the transactivation activity of the promoters of anthocyanin synthase(CsANSl)and anthocyanidin reductase(CsANRl).Four types of microRNA/target modules,miR319b/CsTCP3-4,miR164b/CsCUC,miR396/CsGRF-GIF,and miR165b/HD-ZIPIII ones,were also identified and characterized for their functions in the regulation of the development of teaplant shoot tips and leaf shape.The results of these modules were reflected by their different expression patterns in developing buds and leaves that had distinctly different morphologies in three different teaplant varieties.Their roles in the regulation of catechin biosynthesis were also further verified by manipulation of microRNA319b(miR319b),which targets the transcripts of CsTCP3 and CsTCP4.Thus,CsTCPs represent at least one of these important groups of TFs that can integrate tea plant leaf development together with secondary metabolite biosynthesis.Our study provides new insight into shoot tip development and catechin production in tea plants and lays a foundation for further mechanistic understanding of the regulation of tea plant leaf development and secondary metabolism. | Shuwei Yu Penghui Li Xuecheng Zhao Mangmang Tan Muhammad Zulfiqar Ahmad Yujie Xu Million Tadege Jian Zhao | 2021 | Horticulture Research2021，8，1： | 2 |
| 10 | Reduced-dimensional MPC controller for direct thrust control显示文摘With the development of the aircraft gas turbine engine, a control system should be able to achieve effective thrust control to gain better operability. The main contribution of this paper is to develop a novel direct thrust control approach based on an improved model predictive control method through a strategy that reduces the dimension of control sequence. It can not only achieve normal direct thrust control tasks but also maximize the thrust level within the safe operation boundaries. Only the action of switching the objective functions is required to achieve the switch of these two thrust control modes while there is no modification to the control structure. Besides,a shorter control sequence is defined for multivariable control by updating only one control variable at every simulation time instant. Therefore, the time requirement for the solving process of the optimal control sequence is reduced. The proposed controller is implemented to a twin-spool engine.Simulations are conducted in the wide flight envelope, and results show that the average timeconsumption can be reduced up to 65% in comparison with the standard model predictive control,and the thrust can be increased significantly when maximum thrust mode is implemented by using engine limit margins. | Shuwei PANG Soheil JAFARI Theoklis NIKOLAIDIS Qiuhong LI | 2022 | Chinese Journal of Aeronautics2022，35，4： | 2 |
| 11 | β-delayed proton decays near the proton drip line显示文摘We briefly reviewed the experimental study on a-delayed proton decays near the proton drip line published by our group during the period of 1996―2004, namely the first observation of the a-delayed proton decays of 9 new nuclides in the rare-earth region and the new measurements of a-delayed proton decays of 5 nuclides in the mass ~90 region near the N = Z line with the aid of the “p-?” coincidence in combination with a He-jet tape transport system. In the meantime some important experimental technique details were supplemented. The experimental results, including the half -lives, spins, parities, deformations and production reaction cross sections for the 14 nuclei were summarized and compared with the current nuclear-model predictions, and then the following points were represented. (1) The experimental half-lives for 85Mo and 92Rh as well as the predicted “waiting point” nuclei 89Ru and 93Pd are 5―10 times longer than the theoretical predictions given by M?ller et al. using a macroscopic-microscopic model. It considerably influences the predictions of the abundances of the nuclides produced in the rp-process. (2) The current-model predictions are not consistent with the experimental assignments of the spins and parities for the proton drip-line nuclei 142Ho and 128Pm. However, the nuclear potential energy surface (PES) calculated by using a Woods- Saxon-Strutinsky method reproduced the experimental results. (3) The Alice code overestimated the production reaction cross sections of the studied 9 rare-earth nuclei by one order of magnitude or two, while HIVAP code overestimated them by one order of magnitude approximately. | XU Shuwei 1 , LI Zhankui 1 , XIE Yuanxiang 1 , HUANG Wenxue 1 , SHU Nengchuan 2 , CHEN Yongshou 2 , XU Furong 3 , WANG Kun 4 , PAN Qiangyan 1 , WANG Xudong 1 , YU Yong 1 & XING Yebing 1 1. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China 2. Nuclear Physics Department, China Institute of Atomic Energy, Beijing 102413, China 3. Department of Technical Physics, Peking University, Beijing 100871, China 4. Shanghai Institute for Nuclear Research, Shanghai 201800, China | 2005 | Science China(Physics,Mechanics & Astronomy)2005，48，3： | 2 |
| 12 | Photo-Isomerization Energy Storage Using Azobenzene and Nanoscale Templates: A Topical Review显示文摘Azobenzene(AZO) has attached tremendous attention in the field of photo-isomerization energy storage due to its advantages of absorbing light in ultraviolet-visible range and reversible isomerization. However, the issues of low energy density and short half-lifetime restrict the further development of AZO. Therefore, a method, by preparing hybrid photo-isomerization energy storage materials using nanoscale templates, was proposed to handle the above two issues. In this paper, a summary of hybrid photo-isomerization energy storage materials with AZO and nanoscale templates is conducted from the aspects of templates, preparation methods, derivatives and applications. The performances of template candidates, i.e. carbon nanotubes(CNTs) and graphene(GO) are reviewed and compared based on the analysis of grafting density, energy density, and half-lifetime of hybrid materials. Then, two major preparation methods of AZO hybrid materials including non-covalent and covalent functionalizations are discussed. Furthermore, the studies on AZO derivatives functionalized on nanoscale templates are summarized to further point to the direction of derivatization towards high performance AZO-functionalized materials. Finally, due to the superiority of AZO hybrid solid-state films in large-scale utilization, their current applications are reviewed to find out some promising applications. | LI Shuwei WANG Hongqiang FANG Juan LIU Qibin WANG Jiangjiang GUO Shaopeng | 2020 | Journal of Thermal Science2020，29，2： | 2 |
| 13 | New β-delayed Proton Precursor ^(135)Gd显示文摘Newβ-delayedProtonPrecursor^(135)Gd￥XuShuwei;XieYuanxiang;LiZhankui;MaRuichang;GeYuanxiu;WangChunfang;GuoBing;XingJianping;Hu?.. | Xu Shuwei Xie Yuanxiang Li Zhankui Ma Ruichang Ge Yuanxiu Wang Chunfang Guo Bing Xing Jianping Huang Wenxue Zhang Tianmei Liu Zhong Zhu Shaofei Jin Genming and Luo Yixiao | 1996 | IMP & HIRFL Annual Report1996，，1： | 2 |
| 14 | A novel model-based multivariable framework for aircraft gas turbine engine limit protection control显示文摘Control technologies are innovated to satisfy increasingly complicated control demands of gas turbine engines.In terms of limit protection control,a novel model-based multivariable limit protection control method,which is achieved by adaptive command reconstruction and multiplecontrol loop selection and switch logic,is proposed in this paper to address the problem of balancing smaller thrust loss and safe operations by comparing with widely-used Min-Max logic.Five different combination modes of control loops,which represent the online control loop of last time instant and that of current time instant,is analyzed.Different command reconstructions are designed for these modes,which is based on static gain conversion of amplitude beyond limits by using an onboard model.The double-prediction based control loop selection and switch logic is developed to choose a control loop appropriately by comparing converted amplitude beyond limits regardless of one or more parameters tending to exceed limits.The proposed method is implemented in a twin-spool turbofan engine to achieve limit protection with direct thrust control,and the loss of thrust is improved by about 30% in comparison with the loss of thrust caused by Min-Max logic when limit protection control is activated,which demonstrates the effectiveness of the proposed method. | Shuwei PANG Soheil JAFARI Theoklis NIKOLAIDIS Qiuhong LI | 2021 | Chinese Journal of Aeronautics2021，34，12： | 1 |
| 15 | Anti-hyperuricemic and nephroprotective effects of Smilax china L.显示文摘 | Lvyi Chen Huafeng Yin Zhou Lan Shuwei Ma Chunfeng Zhang Zhonglin Yang Ping Li Baoqin Lin | 2011 | Journal of Ethnopharmacology2011，，2： | 1 |
| 16 | Preparation, thermal stability and flame-retardant properties of halogen free polypropylene composites 显示文摘 | Li Yiluen Kuan Chenfeng Hsu Shuwei | 2012 | High Performance Polymers2012，24，6： | 1 |
| 17 | Noninvasive identificational diagnosis of diabetic nephropathy and non-diabetic renal disease based on clinical characteristics of Traditional Chinese Medicine symptom pattern and conventional medicine显示文摘OBJECTIVE:To study the clinical characteristics relating to differential diagnosis of diabetic nephropathy(DN) and non-diabetic renal disease(NDRD).METHODS:The subjects were patients with type 2 diabetes mellitus(T2DM) complicated with chronic kidney disease(CKD).Western medical history data and Traditional Chinese Medicine(TCM) symptom pattern were collected,and logistic regression was used to analyze.RESULTS:Blood deficiency pattern [odds ratio(OR) = 2.269,P = 0.017] and Qi stagnation pattern(OR = 1.999,P = 0.041) are independently related to DN.CONCLUSIONS:TCM factors blood deficiency pattern and Qi stagnation pattern are relating to differential diagnosis of DN and NDRD. | QU Yilun CHENG Haimei WANG Qian LI Shuang DUAN Shuwei FENG Zhe LI Weizhen JIANG Shuangshuang YANG Hongtao MAO Yonghui GENG Yanqiu LI Jijun LIU Yuning TIAN Jinzhou LIU Hongfang DONG Zheyi CHEN Xiangmei | 2023 | Journal of Traditional Chinese Medicine2023，43，3： | 1 |
| 18 | Dietary protein levels changed the hardness of muscle by acting on muscle fiber growth and the metabolism of collagen in sub-adult grass carp(Ctenopharyngodon idella)显示文摘Background:Nutrient regulation has been proven to be an effective way to improve the flesh quality in fish.As a necessary nutrient for fish growth,protein accounts for the highest proportion in the fish diet and is expensive.Although our team found that the effect of protein on the muscle hardness of grass carp was probably related to an increased collagen content,the mechanism for this effect has not been deeply explored.Moreover,few studies have explored the protein requirements of sub-adult grass crap(Ctenopharyngodon idella).Therefore,the effects of different dietary protein levels on the growth performance,nutritional value,muscle hardness,muscle fiber growth,collagen metabolism and related molecule expression in grass carp were investigated.Methods:A total of 450 healthy grass carp(721.16±1.98 g)were selected and assigned randomly to six experimen-tal groups with three replicates each(n=25/replicate),and were fed six diets with 15.91%,19.39%,22.10%,25.59%,28.53%and 31.42%protein for 60 d.Results:Appropriate levels of dietary protein increased the feed intake,percentage weight gain,specific growth rate,body composition,unsaturated fatty acid content in muscle,partial free amino acid content in muscle,and muscle hardness of grass carp.These protein levels also increased the muscle fiber density,the frequency of new muscle fibers,the contents of collagen and IGF-1,and the enzyme activities of prolyl 4-hydroxylases and lysyloxidase,and decreased the activity of matrix metalloproteinase-2.At the molecular level,the optimal dietary protein increased col-lagen type Iα1(Colα1),Colα2,PI3K,Akt,S6K1,La ribonucleoprotein domain family member 6a(LARP6a),TGF-β1,Smad2,Smad4,Smad3,tissue inhibitor of metalloproteinase-2,MyoD,Myf5,MyoG and MyHC relative mRNA levels.The levels of the myostatin-1 and myostatin-2 genes were downregulated,and the protein expression levels of p-Smad2,Smad2,Smad4,p-Akt,Akt,LARP6 and Smad3 were increased.Conclusions:The appropriate levels of dietary protein promoted the growth of sub-adult grass carp and improved muscle hardness by promoting the growth of muscle fibers,improving collagen synthesis and depressing collagen degradation.In addition,the dietary protein requirements of sub-adult grass carp were 26.21%and 24.85%according to the quadratic regression analysis of growth performance(SGR)and the muscle hardness(collagen content),respectively. | Min Dong Lu Zhang Pei Wu Lin Feng Weidan Jiang Yang Liu Shengyao Kuang Shuwei Li Haifeng Mi Ling Tang Xiaoqiu Zhou | 2023 | Journal of Animal Science and Biotechnology2023，14，2： | 1 |
| 19 | Optimization of core-shell structure distribution in sintered Nd-Fe-B magnets by titanium addition显示文摘In view of the uneven distribution of the core-shell structure of sintered Nd-Fe-B magnets after grain boundary diffusion,this study proposes to use high-melting-point and reactive element titanium(Ti)as an additive to increase the diffusion channels and to enhance the diffusion of heavy rare earth elements along the grain boundary phase.By adding Ti element,the diffusion depth and hence the intrinsic coercivity of magnets are increased significantly.The addition of Ti increases the coercivity at two stages:initially from 16.07 to 16.29 kOe by addition effect,and then from 16.29 to 25.16 kOe by facilitating the diffusion of Tb element.The formation of TiB_(2) phase improves the periodic arrangement of the crystal structure in the surroundings of the grain boundary phase and enhances its activity.The improved grain boundary diffusion and better core-shell structure distribution provide a theoretical guidance fo r solving the problem of diffusion depth in bulk magnets. | Shuwei Zhong Munan Yang Sajjad Ur Rehman Sangen Luo Longgui Li Chao Li Jiajie Li Shuhua Xiong Ihor Bulyk Bin Yang | 2023 | Journal of Rare Earths2023，41，7： | 1 |
| 20 | Short-term effects of raw rice straw and its derived biochar on greenhouse gas emission in five typical soils in China显示文摘 | Feiyue Li Xinde Cao Ling Zhao Fan Yang Jianfei Wang Shuwei Wang | 2013 | Soil Science and Plant Nutrition2013，，5： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员