Li2FeSiO4/C hollow nanospheres as cathode materials for lithium-ion batteries

Undoubtedly, it is imperative to figure out two stubborn issues concerning low electronic conductivity and sluggish lithium ion diffusion to promote the practical application of Li2FeSiO4 materials in lithium-ion battery (LIB) cathode. Herein, we report an innovative and simple strategy that combines a hydrothermal process with subsequent annealing to synthesize highly uniform Li2FeSiO/C hollow nanospheres. During the hydrothermal process, polystyrenen anospheres are employed not only as the template but also, more tactfully, as carb on source to form amorphous carbon layers, which will function to enhance the electronic conductivity and restrict particle aggregations. The use of the LIB Li2FeSiO4/C hollow nano spheres as a LIB cathode delivers a desired stable capacity at each rate stage, and eve n at a high rate of 10 C, the hollow nano sphere cathode can prese nt a specific discharge capacity as high as 50.5 mAh·g^-1. After 100 cycles, the capacity rete ntions at 1 and 10 C remain as high as 93% and 72%, respectively. The superior electrochemical performance is believed to be related to special architectures of the Li2FeSiO4/C hollow nano sphere cathode.

Clinical regularities in acupuncture-moxibustion treatment of cancer pain in recent 30 years

Objective: To explore the clinical regularities in acupuncture-moxibustion treatment of cancer pain by reviewing the re leva nt studies published betwee n 1985 and 2017. Methods: Based on the Chinese Medicine Acupuncture-moxibustion Information Database, quantitative analysis, correlation an alysis and Chi-square test were applied to an a lyze the comm only used acupoi nts, meridia n affiliatio ns and body regi on distributi ons, comm only used methods and acupoi nt correlati ons, treatme nt method correlati ons, the efficacy of acupuncture- moxibusti on plus the three-step an algesic ladder for can cer pain, and in dicators. Results: Zusanli (ST 36), Ashi point and Sanyinjiao (SP 6) ranked the top on the list of frequency;points from Bladder Meridian of Foot Taiyang and Stomach Meridian of Foot Yangming were often used;points from the lower limbs and back had high frequencies. The most commonly used treatment method was acupuncture-moxibustion plus medication. Acupuncture-moxibusti on plus the three-step an algesic ladder showed certai n adva ntage compared with the two methods used separately, and among the integrated methods, acupoint application plus the three-step analgesic ladder produced the most significant efficacy. It took (44.77±55.54) min for the analgesic effect to act and the effect lasted for (12.81±14.59) h. Numerical rati ng scale (NRS), visual an alog scale (VAS) and Kar nofsky performa nee status (KPS) scores all showed sign ifica nt changes after interventions (all P<0.01);there was no significant change in the score of quality of life (QOL) after interventions (P>0.05). Conclusion: Zusa nli (ST 36), Ashi point and Sanyin jiao (SP 6) are comm only selected in acup un cture-moxibusti on treatment of cancer pain;acupuncture and acupoint application are often used;acupuncture-moxibustion plus the three-step an algesic ladder can boost the treatme nt efficacy.

FLUID DYNAMIC PERFORMANCE OF GROOVED PLANING BOAT AND ITS EFFECT ON RESISTANCE

In this paper, the fluid dynamic performance for a new boat form grooved planing boats is analyzed, and the results of resistance tests for seven grooved planing boat models of different types are presented in the form of curves of attack angle and resistance-weight ratio versus Froude number. According to these curves, the effect of some parameters of the boat type on the resistance is analyzed.