Pressure-induced growth of coralloid-like FeF_(2) nanocrystals to enable high-performance conversion cathode

Fluoride ferrous(FeF_(2))is viewed as a promising conversion cathode material for next-generation lithiumion batteries(LIBs)due to its high theoretical specific capacity and low cost.Unfortunately,issues such as poor intrinsic conductivity,iron dissolution,and phase separation hinder the application of FeF_(2)in highenergy cathodes.Here,a pressure-induced morphology control method is designed to prepare coralloidlike FeF_(2)nanocrystals with nitrogen-rich carbon coating(c-FeF_(2)@NC).The coralloid-like interconnected crystal structure of c-FeF_(2)@NC contributes to reducing interfacial resistance and enhancing the topotactic transformation during the conversion reaction,and the nitrogen-rich carbon(NC)coating can enhance interfacial stability and kinetic performance.When used as a conversion cathode for LIBs,c-FeF_(2)@NC exhibits a high initial reversible capacity of 503.57 mA h g^(-1)and excellent cycling stability of497.61 m A h g^(-1)with a low capacity decay of 1.19%over 50 cycles at 0.1 A/g.Even at 1 A/g,a stable capacity of 263.78 mA h g^(-1)can still be retained after 200 cycles.The capability of c-FeF_(2)@NC as a conversion cathode for sodium-ion batteries(SIBs)was also evaluated to expand its field of application.Furthermore,two kinds of full batteries have been assembled by employing c-FeF_(2)@NC as cathodes and quantitative limited-Li(LLi)and pre-lithiated reduced graphene oxide(PGO)as anodes,respectively,to envisage the feasibility of practical applications of conversion materials.

Model Predictive Control-Based Direct Torque Control for Matrix Converter-Fed Induction Motor with Reduced Torque Ripple

To reduce the torque ripple in motors resulting from the use of conventional direct torque control(DTC),a model predictive control(MPC)-based DTC strategy for a direct matrix converter-fed induction motor is proposed in this paper.Two new look-up tables are proposed,these are derived on the basis of the control of the electromagnetic torque and stator flux using all the feasible voltage vectors and their associated switching states.Finite control set model predictive control(FCS-MPC)has then been adopted to select the optimal switching state that minimizes the cost function related to the electromagnetic torque.Finally,the experimental results are shown to verify the reduced torque ripple performance of the proposed MPC-based DTC method.

Electroacupuncture for treatment of diabetic peripheral neuropathy:A systematic review of randomized controlled trials

Objective:To assess the effectiveness and safety of electroacupuncture for the treatment of diabetic peripheral neuropathy(DPN).Clinical studies in China have shown the beneficial effect of electroacupuncture compared with conventional medicine.However,the effectiveness of electroacupuncture has not been well acknowledged internationally.Methods:We searched the following databases from their inception through February 2016:MEDLINE,the Cochrane Central Register of Controlled Trials(April,2015),SinoMed,China National Knowledge Infrastructure,VIP,Wanfang Database,Chinese Important Conference Papers Database,and the Chinese Dissertation Database.Randomized controlled trials(RCTs)were included if they compared electroacupuncture to conventional medicine,placebo,or no treatment on DPN patients.RevMan 5.3 software was used for data analysis,with effect estimate presented as relative risk(RR)and mean difference(MD)with a 95%confidence interval(CI).Results:Eleven RCTs involving 837 participants were included.The methodological quality of included RCTs was generally poor in terms of sequence generation,allocation concealment,blinding,incomplete outcome data,and selective outcome reporting.Meta-analysis showed that electroacupuncture had a better effect on global symptom improvement than methylcobalamin(RR Z 1.29;95%CI:1.14e1.46)and vitamin B(RR Z 1.60;95%CI:1.33e1.94).Only two RCTs reported adverse events.