简介:AbstractImportance:Tics usually start around 4-6 years old and affect about 1% of school-age children. Premonitory urges (PUs) are sensory phenomena that precede tics and are often described as unpleasant feelings. Recent evidence supports a relationship between PUs and tic severity, but reports are conflicting. In addition, there is no report of PUs in the Chinese population.Objective:To investigate the correlation between PUs and tic symptoms in the Chinese population with tic disorders.Methods:We recruited 252 Chinese individuals with chronic tic disorders (age 5-16 years). The Yale Global Tic Severity Scale (YGTSS) was used to assess tic symptoms, and the Premonitory Urge for Tics Scale (PUTS) was used to assess PUs. We calculated Spearman correlations between PUTS and YGTSS scores, and constructed a linear regression model to predict the tic symptom severity by PUs.Results:There was a significant positive correlation between PU severity (PUTS scores) and motor tic severity, total tic severity, tic-caused impairment (YGTSS scores) (P < 0.05). PU severity was a significant positive predictor of tic symptom severity (standardized beta coefficient = 0.174, t = 2.786, P = 0.006).Interpretation:We provide evidence for a correlation between PUs and tic symptoms. PU severity predicts tic symptom severity. Further research on PUs is needed to clarify the shared brain mechanism with tics, and their role in tic expression. A suitable tool to assess PUs in younger children is also needed.
简介:AnewapproachtothemassiveproductionofTiCwhiskerswithhighpurityandlowcostwaspresented.Itisamodifiedcarbothermalreductionmethod(MCTR)characterizedbyargonstreamflowingverticallyandpassingthroughtheinteriorofthemixtureofrawmaterials.Itisfoundforthefirsttimethatthereisanoptimumflowoftheupwardflowingargonstream,atwhichlargequantityofhighqualityTiCcanbeobtained.Thispaperdescribedthenewmethod,analyzedthemechanismandconditionsfortheformationofhighpurityTiCwhiskersonalargescale,andcomparedMCTRwiththetraditionalcarbothermalreductionmethod(TCTR).Basedontheanalysisandcomparison,itisconcludedthatinordertoproducehighqualitytransitionmetalcarbides,nitridesandcarbonitrideswithlowcostTCTRmustbereplacedbyMCTR.
简介:AbstractTic disorders (TD) is a neurodevelopmental disorder that is often first recognized in children and adolescents and is characterized mainly by motor and phonic tics. Drug treatment of TD has been criticized because of serious side effects, and TD treatment emphasizes behavioral psychotherapy. This study reviewed the most common behavioral psychotherapy for TD: habit reversal training (HRT). We examined the contents, variation, curative effects, and premonitory urge control of HRT and other behavioral psychotherapies. The findings suggest that current understanding of HRT is insufficient and further studies are needed. First, studies of online guidance training are needed to implement technology that can help more patients. Second, the future integration of HRT and other technologies is important. Third, imaging techniques could be used to further explore the brain mechanisms underlying HRT. Research on HRT for TD in China is insufficient. We call on more Chinese researchers to study, investigate, and develop technology to promote the development of behavioral psychotherapy for TD in China.
简介:四川省峨眉山市振兴宏业贸易公司 四川峨眉山 614224 摘要:我从磁场体的两极性质中发现了两种场粒子,和两种场粒子的逆进运动性质。从而推纶出电子由场粒子逆进运动构成,和中子,原子的形成在宇宙的过程。从而推论出原子的基本模形。又由原子基本模形推出光波的产生原理。又由光的产生原理和场粒子运动规律推出光在宇宙中的许多现象。又由原子失去电子后,能聚集很大的磁场圈推论出黑洞与中子星基本由无电子的原子构成等。
简介:Si3N4/TiCnanocompositeceramicshavebeenfabricatedbyhotpressingtechniquewithAl2O3andY2O3asadditives.TheresultsshowedthatwelldispersedcompositepowderwascarriedoutbyaddingdispersantandadjustingpHvaluesofsuspensions.RemarkableincreaseinflexuralstrengthatroomtemperatureswasobtainedbyaddingnanoparticlesinSi3N4matrixwith10%(wtpct)ofnano-Si3N4and15%ofnano-TiC.Theflexuralstrength,fracturetoughnessandhardnesswere1025MPa,7.5MPa·1/2and15.6GPa,respectively.Themicrostructuresofmaterialswereanalyzedbyscanningelectronmicroscopy(SEM)andtransmissionelectronmicroscopy(TEM),whichindicatedthatTiCnanoparticlesdistributeinthematrixandatthegrainboundaries.Accordingtothefractureform,lowcontentsofnanoparticlescouldrefinematrixgrainsandleadtothecrackdeflectionaswellascrackpinning.Themultiplexmicrostructurewasformedbymixingnano-Si3N4particles.Thecracktrajectoriesexhibitedcrackdeflection,rod-likegrainbridgingandpull-out.
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简介:通过微波烧结制备TiC/6061铝基复合材料,采用TEM、EDS、XRD分析该复合材料结合界面的结构、元素分布和相组成;从热力学角度研究新相的形成机理。结果表明:结合界面存在厚度约为100nm的扩散型和反应型2种中间层,其与基体和增强相的邻接整洁、边界连续、结合紧密。扩散型界面,具有(111)Al//(240)TiC,[011]Al//[001]TiC的晶体学位向关系并形成半共格界面;反应型界面,由TiAl和微纳米级的Al4W相组成。界面TiAl相的热力学形成机理为Al和Ti元素通过扩散的方式首先生成TiAl3,之后随Ti元素的进一步扩散占据TiAl3中Al的位置,最终形成TiAl。