基于RFID的模拟听诊系统设计与研究

心肺听诊是临床医生和医学相关专业学生必须掌握的基本实践技能。传统的描述讲授法,不够直观。各高校或医院引入的模拟听诊教具,使用起来有局限性、易损坏且价格昂贵。针对以上问题,本文设计并开发出基于RFID的模拟听诊系统,使用单片机和射频识别传感器,结合程序设计,对听诊过程进行仿真,将临床听诊技术教学模式,向虚拟仿真教学模式转变。

Nano-silica-decorated Poly(m-Phenylene Isophthalamide)Separator with Enhanced Mechanical and Electrolyte Wetting Properties for Lithium-Ion Batteries

Heat-resistant poly(m-phenylene isophthalamide)(PMIA)has attracted considerable attention as a novel separator for application in lithium-ion batteries(LIBs);however,its mechanical strength and electrolyte wettability are not ideal.Herein,a nano-silica-decorated poly(m-phenylene isophthalamide)(PMIA@SiO2)separator was fabricated with SiO2 nanoparticles uniformly attached to the pores and pore walls of the PMIA separator.The as-prepared PMIA@SiO2 separator has good mechanical strength(a 16%improvement compared with pristine PMIA)and wettability toward the electrolyte(the contact angle decreases from 34.0°to 23.1°).The PMIA@SiO2 separator also had a high ionic conductivity(0.75 mS/cm)and low interfacial electric resistance(75Ω).The assembled LiCoO2/PMIA@Si O2-liquid electrolyte/Li cell displays good cycle performance with a capacity retention of 88.1%after 50 cycles.Furthermore,the cycling performance and rate capacity rarely changed after high-temperature treatment.Therefore,the nano-silica-decorated PMIA separator is a potential candidate for application in LIBs with high safety.

The antioxidant protein ZmPrx5 contributes resistance to maize stalk rot

Maize(Zea mays L.)stalk rot is a devastating disease worldwide,causing severe yield losses.Although previous studies have focused on the genetic dissection of maize resistance to stalk rot,the mechanisms of resistance remain largely unknown.We used a comparative proteomics approach to identify candidate proteins associated with stalk rot resistance.Statistical analyses revealed 763 proteins differentially accumulated between Fusarium graminearum and mock-inoculated plants.Among them,the antioxidant protein ZmPrx5,which was up-accumulated in diseased plants,was selected for further study.ZmPrx5 transcripts were present in root,stalk,leaf,ear,and reproductive tissues.The expression of ZmPrx5 in three inbred lines increased significantly upon F.graminearum infection.ZmPrx5 was localized in the cytoplasm.Compared to control plants,maize plants overexpressing ZmPrx5 showed increased resistance to F.graminearum infection,and ZmPrx5 mutant plants were more susceptible than wild-type plants.Defense-associated pathways including plant–pathogen interactions,phenylalanine metabolism,and benzoxazinoid and flavonoid biosynthesis were suppressed in ZmPrx5 homozygous mutant plants compared with wild-type plants.We suggest that ZmPrx5 positively regulates resistance against stalk rot in maize,likely through defense-oriented transcriptome reprogramming.These results lay a foundation for further research on the roles of Prx5 subfamily proteins in resistance to plant fungal diseases,and provide a potential genetic resource for breeding disease-resistance maize lines.

A Study on the Translation of Culture Loaded Words From the Perspective of Skopos Theory

“A word is the best evidence of the reality of culture,in the sense of a historically transmitted system of conceptions and attitudes”.University website is an important window of foreign publicity while its English version is an important window for foreign students in particular.Culture loaded words,with their unique foreign flavor,are the miniature of colorful culture.Therefore,the translation of culture loaded words on university websites plays an important role in foreign publicity,as it will reflect the image of different university and indirectly affect the foreign publicity of China.This study selects from the websites of North China Electric Power University(NCEPU)two representative news and analyzes the translation of culture loaded words on university websites from the perspective of Skopos Theory.Finally,the author proposes three methods in translating these words—transliteration,literal translation,and free translation,which are suggestive for the translation of culture loaded words on the university websites.

Friction reactions induced by selective hydrogenation of textured surface under lubricant conditions

The passivation of hydrogen atoms and the conformation of textured surfaces under oil-lubricated conditions are effective strategies to obtain amorphous carbon(a-C)films with extremely low friction.It is critical to understanding the influence mechanism of selective surface hydrogenation on the tribological behaviors of textured a-C film under oil-lubricated conditions.In particular,the interactions of hydrogen atoms and lubricants are confusing,which is enslaved to the in situ characterization technique.The reactive molecular dynamics(RMD)simulations were conducted to analyze the friction response of textured a-C films with selective hydrogenation surfaces under oil-lubricated conditions.The results indicate that the existence of hydrogen atoms on specific bump sites significantly decreases the friction coefficient(μ)of textured a-C film,which is highly dependent on the surface hydrogen content.The repulsion between hydrogen atoms and lubricant molecules prompts the formation of a dense lubricant film on the surface of the mating material.Interestingly,with the enhancement of the surface hydrogen content,the passivation of the friction interface and the repulsion between hydrogen atoms and lubricants play dominant roles in reducing the friction coefficient instead of hydrodynamic lubrication.

How to locate the dural defect in a spinal extradural meningeal cyst: a literature review

Spinal extradural meningeal cysts(SEMCs)are rare lesions of the spinal canal.Although closure of the dural defect can achieve satisfactory therapeutic effects,locating the fistula is difficult.This review summarizes the methods for locating the fistula of SEMCs and the distribution and features of fistula sites.This was a non-systematic literature review of studies on SEMCs.We searched PubMed for English-language articles to summarize the methods of locating the defect.The search words were“epidural arachnoid cyst,”“dural cyst,”“epidural cyst,”and“epidural meningeal cyst.”For the defect location component of the study,case reports,studies with a sample size less than four,controversial ventral dural dissection(s),and undocumented fistula location reports were excluded.Our review showed that radiography and computed tomography(CT)may show changes in the bony structure of the spine,with the largest segment of change indicating the fistula site.Occasionally,magnetic resonance imaging(MRI)can show a cerebrospinal fluid(CSF)flow void at the fistula site.The middle segment of the cyst on sagittal MRI,the largest cyst area,and cyst laterality in the axial view indicate the fistula location.Myelography can show the fistula location in the area of the enhanced cyst and subarachnoid stenosis.Digital subtraction or delayed CT can be used to observe the location of the initial cyst filling.Cine MRI and time-spatial labeling inversion pulse techniques can be used to observe CSF flow.Steady-state image construction interference sequence MRI has a high spatial resolution.Neuroendoscopy,MRI myelography,and ultrasound fistula detection can be performed intraoperatively.Moreover,the fistula was located most often in the T12–L1 segment.Identifying the fistula location is difficult and requires a combination of multiple examinations and experience for comprehensive judgment.