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| 1 | “Bottom‐Up” Embedding of the J?rgensen–Hayashi Catalyst into a Chiral Porous Polymer for Highly Efficient Heterogeneous Asymmetric Organocatalysis显示文摘 | Chang AnWang Zhi KunZhang TaoYue Ya LeiSun LeiWang Wei DavidWang YuanZhang ChongLiu WeiWang | 2012 | Chem. Eur. J2012，，22： | 1 |
| 2 | Effective design of A-D-A small molecules for high performance organic solar cells via F atom substitution and thiophene bridge显示文摘Three novel small molecules with acceptor-donor-acceptor(A-D-A) configuration,SBDT1,SBDT2 and SBDT3,where 4,8-bis(octyloxy)benzo[1,2-b:4,5-b’]dithiophene(BDT) as the electron-donating core connecting to thiophene-substituted benzothiadiazole(BT) as electron-withdrawing are reported.The effects of fluorine atoms on the photophysical properties by introducing different fluorine atoms into the benzothiadiazole unit were investigated.These SBDTs exhibit good thermal stability,excellent panchromatic absorption in solution and film.SBDT2 and SBDT3 with fluorine-substituted BT possess a relatively deeper the highest occupied molecular orbital(HOMO).These A-D-A type molecules were treated as donor and PC71 BM as acceptor in bulk heterojunction(BHJ) small-molecule organic solar cells(SMOSCs).Among them,device based on SBDT2 gave the best device performance with a PCE of 5.06%with Jsc of 10.56 mA/cm^2,Voc of 0.85 V,fill factor(FF) of 56.4%.These studies indicate that proper incorporation of fluorine atoms is an effective way to increase the efficiency of organic solar cells. | Anwang He Yuancheng Qin Weili Dai Dan Zhou Jianping Zou | 2019 | Chinese Chemical Letters2019，30，12： | 0 |
| 3 | A Proactive Selection Method for Dynamic Access Points Grouping in User-centric UDN显示文摘Network densification is a promising solution to fulfill network capacity requirement and transmission rate for beyond 5G and 6G wireless communications.Ultra-dense network(UDN)integrates heterogeneous network resources and coordinates technologies on quality of service controlling,to provide users with flexible service.However,dense deployment reduces coverage radius of the cell,resulting in an increase on handover frequency,which makes a serious impact on service continuity.In this paper,we propose a proactive selection method for dynamic access points grouping(DAPGing)in accordance with“user-centric”philosophy,which selects target Access Points(AP)and reduces handover times to ensure communication continuity.This method includes two criteria:1)the user’s sojourn time,which is determined by analyzing the AP coverage area;2)neighbor relationship between APs,which is determined by coverage area and signal strength characteristics between neighboring APs.Therefore,candidate APs become the proactive selected ones to update the AP group.Stochastic geometry is used to build system model and performance metrics are analyzed,including AP group coverage probability and average update frequency.Experimental analysis shows that the proposed proactive selection method brings similar coverage probability to traditional handover method,while average update frequency is reduced more than 20%selection criteria. | Bo Hu Fangxia Zuo Chuan’anWang Shanzhi Chen | 2021 | China Communications2021，18，4： | 0 |
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