基于改进TS模糊的直流电弧炉闪变抑制优化

为提高静止无功补偿器(static var compensator,SVC)应对直流电弧炉等冲击性负载的闪变抑制性能,文中在改进Takagi-Sugeno(TS)模糊算法的基础上,提出一种SVC滚动预测控制方法。首先,建立直流电弧炉电气模型并仿真分析其无功特性;然后,针对经典TS模糊预测算法应用于波动负荷时出现的输出异常置0情况,提出一种范围自适应修正的改进方法,该方法能消除一类算法应用机理导致的异常值,从而提高TS模糊算法对波动负荷无功功率预测的可靠性和准确性;最后,基于模型训练时间约束,建立无功功率半周期滚动预测控制模型,提前10 ms预测无功功率,改善了SVC传统控制系统响应的滞后特性。仿真结果表明,相比于SVC传统控制方法,所提方法的平均闪变改善率提高了54.17%,验证了所提方法对闪变现象的抑制效果提升显著。

T-SPOT联合颗粒酶B阳性Ts淋巴细胞对成人结核病诊断的价值

目的探讨结核感染T细胞斑点试验(T-SPOT.TB)联合颗粒酶B(GrB)+CD8^(+)T淋巴细胞在诊断结核病中的价值。方法选取南昌大学第一附属医院2021年2月至2022年3月疑似结核病患者212例,所有患者均保留T-SPOT结果,流式细胞仪检测外周血中T淋巴细胞亚群及其穿孔素和GrB的表达,根据出院最终诊断分为结核病组和非结核病组,比较两组间T-SPOT斑点数和淋巴细胞亚群及其穿孔素和GrB表达差异,ROC曲线分析ESAT-6斑点数,CFP-10斑点数,结核特异性抗原(TBAg)与植物血凝素(PHA)斑点数的比值(TBAg/PHA)(ESAT-6/PHA和CFP-10/PHA中较大的一个),GrB^(+)Ts(CD8^(+)T)及“结核比值”[TBAg/(PHA*GrB^(+)Ts)]的诊断效能。结果GrB^(+)Ts细胞百分比在结核组中显著高于非结核组(44.95±2.98 vs 33.49±1.87,P<0.05),而总T细胞、穿孔素+T细胞,GrB^(+)T细胞,Ts细胞和穿孔素+Ts细胞百分比差异无统计学意义(P>0.05);非结核组T-SPOT.TB阳性率为51.85%,明显低于结核组的92%,且结核组的A抗原斑点数及B抗原斑点数显著大于非结核组(P<0.05),ROC曲线显示A抗原诊断结核病的灵敏度和特异性分别为80.0%和56.8%,曲线下面积(AUC)为0.748,约登指数为0.368;B抗原的灵敏度和特异性为分别62.0%和77.8%,AUC为0.758,约登指数为0.398;A抗原+B抗原灵敏度和特异性为72.0%和74.1%,AUC为0.796,约登指数为0.461;结核组的TBAg/PHA比率要显著高于非结核组(1.21±0.17 vs 0.26±0.02,P<0.001)以0.59为cut-off值时,诊断结核病的灵敏度和特异性分别为66%和91.4%,AUC高达0.852,约登指数为0.574;结核组的“结核比值”要显著高于非结核组(4.58±0.87 vs 1.71±0.24,P<0.01),以1.24为cut-off值时,诊断结核病的灵敏度和特异性分别为82.0%和72.2%,AUC为0.794,约登指数为0.542。结论应用TBAg/PHA比率和TBAg/(PHA*GrB^(+)Ts)比值诊断结核病的效能要优于常规的T-SPOT检测,两者结合使用对结核病诊断可能具有重要价值。

无溶剂快速合成S-1和TS-1分子筛

Silicalite-1(S-1)和Titanium Silicalite-1(TS-1)沸石分子筛因其良好的疏水性、热稳定性和择形性等特点,作为环境友好的绿色催化剂在工业应用上极具优势和价值.采用无溶剂法成功合成了TS-1分子筛,并利用X-射线衍射仪、全自动比表面和孔隙分析仪、紫外可见光谱仪和扫描电镜等表征仪器研究了晶化时间和硅钛摩尔比对所制备TS-1分子筛的物化性质的影响.结果表明,合成的TS-1沸石分子筛具有较高的结晶度和纯度、均一的晶粒大小、高的比表面积和在分子筛骨架中四配位和六配位的钛物种.无溶剂合成TS-1沸石具有低成本、环境友好和高效的优点,研究将为工业上沸石的规模合成提供一定的理论借鉴.

具有高活性六配位Ti物种的多级孔TS-1分子筛的合成及应用

针对传统微孔TS-1分子筛孔道传输限制以及催化活性低的问题,采用碱腐蚀法制备了3种具有不同孔道结构以及不同钛物种分布的TS-1分子筛催化剂,采用扫描电子显微镜、透射电子显微镜、X射线衍射、N2吸附-脱附等温线、红外光谱、紫外-拉曼光谱、X射线光电子能谱和核磁共振等测试手段对其进行表征,并对其催化苯乙烯氧化反应性能进行评价。结果表明:与单独使用氢氧化钠或四丙基氢氧化铵溶液进行后处理相比,经过四丙基氢氧化铵和乙醇胺混合溶液处理的TS-1分子筛(TS-1-TE)具有最大的外比表面积和介孔体积,有效提高了客体分子的流通扩散效率;同时由于乙醇胺与钛物种的配位作用和四丙基氢氧化铵的重结晶作用,使得从骨架脱出的四配位钛物种能够以单核六配位Ti物种的形式存在于分子筛骨架中,有利于提高催化剂的活性;在温度60℃、压力0.116 MPa、反应时间6 h和催化剂用量50 mg的条件下,TS-1-TE催化剂表现出最高的反应活性,苯乙烯转化率为74.9%,六配位Ti原子转化数为197。

Process-oriented Approach to Motivating Learners:Its Implications and Applications

Drawn upon Dornyei' s motivational study,this paper aims to explore the implications that process-oriented approach may bring and tries to shed light on some applications in Chinese EFL teaching context.

保租房REITs发行效果评价模型及检验

近年,保障性租赁住房被纳入到REI Ts试点行业中,但通过发行REI Ts解决租赁住房的本质问题,促进保障性租赁住房的发展,需要构建科学、系统的评价模型,保障REI Ts的发行能满足各参与方的利益诉求。本文构建保障性租赁住房REI Ts发行效果评价模型,以厦门安居REI T为例进行实证研究,为后续保障性租赁住房发展和发行REI Ts提供经验借鉴。

tRNA^(Glu)-derived fragments from embryonic extracellular vesicles modulate bovine embryo hatching

Transfer RNA-derived small RNAs(tsRNAs)have been shown to be involved in early embryo development and repression of endogenous retroelements in embryos and stem cells.However,it is unknown whether tsRNAs also regulate embryo hatching.In this study,we mined the sequencing data of a previous experiment in which we demonstrated that the microRNA(miRNA)cargo of preimplantation embryonic extracellular vesicles(EVs)influences embryo development.We thus profiled the tsRNA cargo of EVs secreted by blastocysts and non-blastocysts.The majority of tsRNAs was identified as tRNA halves originating from the 5'ends of tRNAs.Among the 148 differentially expressed tsRNAs,the 19 nt tRNA fragment(tRF)tDR-14:32-Glu-CTC-1 was found to be significantly up-regulated in EVs derived from non-blastocysts.RT-qPCR assays confirmed its significant up-regulation in non-blastocyst embryos and their conditioned medium compared to the blastocyst group(P<0.05).Inhibition of tDR-14:32-Glu-CTC-1 by supplementing antagomirs to the conditioned medium improved embryo hatching(P<0.05).Transcriptomic analysis of embryos treated with tDR-14:32-Glu-CTC-1 antagomirs further showed differential expression of genes that are associated with embryo hatching and implantation.In summary,tDR-14:32-Glu-CTC-1 is up-regulated in non-blastocyst embryos and their secretions,and inhibition of tDR-14:32-Glu-CTC-1 promotes embryo hatching,while influencing embryo implantation-related genes and pathways.These results indicate that embryonic EVs containing specific tRFs may regulate preimplantation embryo development.

实现卓越综合临床诊治,赋能未来检验医学——走近“UNIVANTS卓越医疗奖”

UNIVANTS卓越医疗奖(UNIVANTS of healthcare excellence)是一项享有盛名的全球性奖项,UNIVANTS卓越医疗奖是由雅培(Abbott)发起,联合全球领先的医疗保健组织[国际临床化学与检验医学联合会(International Federation of Clinical Chemistry and Laboratory Medicine,IFCC)、美国临床化学协会(American Association for Clinical Chemistry,AACC,现称ADLM)、欧洲健康管理学会(European Health Management Association,EHMA)。

Process-oriented knowledge-sharing platform for chemical engineering design projects

A process-oriented knowledge-sharing platform is studied to improve knowledge sharing and project management of chemical engineering design enterprises. First, problems and characteristics of knowledge sharing in multi-projects of chemical engineering design are analyzed. Then based on theories of project management, process management, and knowledge management, a process-oriented knowledge-sharing platform is proposed. The platform has three characteristics: knowledge is divided into professional knowledge and project management knowledge; knowledge sharing is integrated with the project process, which makes knowledge sharing a necessary part of the project process and ensures the quantity of knowledge shared; the platform provides quantitative measurements of incentive mechanisms for knowledge providers and users which ensures the quality of knowledge shared. This knowledge-sharing platform uses two knowledge management tools, a knowledge map and a knowledge base, to support the platform.

液液萃取/气相色谱-质谱法结合自动解卷积-Kováts保留指数法定性分析电子烟液中的挥发性成分

基于液液萃取/气相色谱-质谱法结合自动解卷积-Kováts保留指数法,建立了电子烟液中挥发性成分的检测方法。对提取溶剂种类进行了优化,并依据烟液中香气成分的香气特征,分析果味和烟草味烟液的香韵构成和差异,确定不同果味烟液的特征香气成分。结果表明:①以乙醚为提取溶剂能减弱丙三醇对其他组分识别的干扰。②自动解卷积法能准确识别共流出组分和低含量组分;Kováts保留指数法提升了化合物识别的准确度。③在10种烟草味烟液中检出15种成分,以豆香、焦香香韵化合物为主;在21种果味烟液中检出80种成分,以果香、花香香韵化合物为主,确定了16类果味烟液的特征香气成分。通过随机验证实验,该方法可有效分辨不同果味类型的果味烟液和烟草味烟液。该方法样品用量少、前处理过程简单、样品分析用时短,能满足烟液中香气成分的检测需要,可为果味电子烟液的检验识别和监管提供参考。

水煤浆添加剂TS-M1对几种煤成浆效果的试验研究

为了考察复合高效水煤浆添加剂TS-M1在水煤浆制浆中的整体成浆效果,以4种特定的煤种为制浆对象,对煤浆质量分数、黏度、流动性及稳定性等进行了量化分析。试验结果及现场应用情况表明:针对煤气化项目现场的应用条件及4种特定煤种,复合高效水煤浆添加剂TS-M1在常规添加量1‰~4.5‰范围内,可制得最高成浆质量分数分别为64%、63.5%、65%和68%的水煤浆,同时能保持良好的煤浆黏度、流动性及稳定性。

制备WO_(3)/TS-1分子筛及催化环戊烯环氧化反应研究

利用湿法浸渍制备了一系列WO_(3)/TS-1分子筛.利用SEM、TEM、XRD、IR、UV-Vis、XPS、BET、ICP等多种分析手段对催化剂的结构、形貌和性质等进行了表征.考察了这一系列分子筛对环戊烯环氧化反应的催化性能,其中以W占分子筛质量分数为4%时浸渍制备的分子筛的催化性能最好.催化剂循环4次后,1,2-环氧环戊烷的选择性和产率保持在68.7%和55.5%左右.

多级孔TS-1分子筛的制备及催化1-辛烯环氧化性能研究

以P123为辅助试剂,制备了一系列分级孔TS-1分子筛.利用红外、紫外、XRD、BET、ICP等对所得样品进行了表征.对样品在过氧化氢环氧化1-辛烯反应中的催化性能进行了评价.结果表明,所得分级孔TS-1沸石均具有典型的MFI结构,其形貌和结构随P123分子量不同有一定的变化.在优化的反应条件下,用P123(MW=5800)合成的样品可以有效地将1-辛烯转化为相应的环氧化物,相应产率可达56.05%,环氧化物选择性可达59.2%.

探索设计之问 2024“设计上海TALENTS”

6月19日—22日,第四届“设计上海TALENTS”在上海世博展览馆再启新篇章。本届设计TALENTS展区依旧采用严格的准入机制,最终共有24组/位Talents参展,其中包括3组国际Talents和6组往届参与者。在设计的世界里,问题与答案总是相互纠缠,互为因果。本次TALENTS展将这种复杂的关系提炼为本届的主题——“The Quest for the Question问是亟的问题”。设计不仅仅是一种表达,更是一种探索和提问的过程。在这个过程中,每个设计师都是探险家,每次尝试都可能开启新的可能性(图01)。

基于GA-TS搜索算法的工业无线传感网节点定位研究

为了解决工业无线传感网覆盖过程中通信半径跳距离产生偏差过大的问题,设计了一种基于GA-TS搜索算法的节点定位方法,并开展仿真分析。研究结果表明,当通信半径不断增大后,算法误差产生不同程度的减少。与传统最大似然估计定位算法相比,GA-TS搜索算法的优化效果更佳,误差大概缩减30%;与移动锚节点算法相比,误差大概降低至15%。相比较之下GA-TS搜索算法定位精度误差最小,具有很大的应用准确性和适应范围。该研究有助于工业无线传感网定位精度,对保证网络信号的传输效率具有一定的意义。

Comprehensive applicability evaluation of four precipitation products at multiple spatiotemporal scales in Northwest China

Precipitation plays a crucial role in the water cycle of Northwest China.Obtaining accurate precipitation data is crucial for regional water resource management,hydrological forecasting,flood control and drought relief.Currently,the applicability of multi-source precipitation products for long time series in Northwest China has not been thoroughly evaluated.In this study,precipitation data from 183 meteorological stations in Northwest China from 1979 to 2020 were selected to assess the regional applicability of four precipitation products(the fifth generation of European Centre for Medium-Range Weather Forecasts(ECMWF)atmospheric reanalysis of the global climate(ERA5),Global Precipitation Climatology Centre(GPCC),Climatic Research Unit gridded Time Series Version 4.07(CRU TS v4.07,hereafter CRU),and Tropical Rainfall Measuring Mission(TRMM))based on the following statistical indicators:correlation coefficient,root mean square error(RMSE),relative bias(RB),mean absolute error(MAE),probability of detection(POD),false alarm ratio(FAR),and equitable threat score(ETS).The results showed that precipitation in Northwest China was generally high in the east and low in the west,and exhibited an increasing trend from 1979 to 2020.Compared with the station observations,ERA5 showed a larger spatial distribution difference than the other products.The overall overestimation of multi-year average precipitation was approximately 200.00 mm and the degree of overestimation increased with increasing precipitation intensity.The multi-year average precipitation of GPCC and CRU was relatively close to that of station observations.The trend of annual precipitation of TRMM was overestimated in high-altitude regions and the eastern part of Lanzhou with more precipitation.At the monthly scale,GPCC performed well but underestimated precipitation in the Tarim Basin(RB=-4.11%),while ERA5 and TRMM exhibited poor accuracy in high-altitude regions.ERA5 had a large bias(RB≥120.00%)in winter months and a strong dispersion(RMSE≥35.00 mm)in summer months.TRMM showed a relatively low correlation with station observations in winter months(correlation coefficients≤0.70).The capture performance analysis showed that ERA5,GPCC,and TRMM had lower POD and ETS values and higher FAR values in Northwest China as the precipitation intensity increased.ERA5 showed a high capture performance for small precipitation events and a slower decreasing trend of POD as the precipitation intensity increased.GPCC had the lowest FAR values.TRMM was statistically ineffective for predicting the occurrence of daily precipitation events.The findings provide a reference for data users to select appropriate datasets in Northwest China and for data developers to develop new precipitation products in the future.

A Study on the Effectiveness of Process-oriented Approach in ESL English Writing Teaching in YAU

This study sets out to conduct the effectiveness of process-oriented approach on the ESL writing teaching for non-Eng-lish majors in Yunnan Agricultural University(YAU),with the aim of enhancing the students' English writing proficiency andscores.120 non-English major sophomores and 10 English teachers from YAU are involved in it.With the results of questionnaire,interview and the composition scores of the target students,the findings indicate that the students have a positive attitude towardsprocess-oriented writing approach and it can help them write better and make the writing class more interesting.

Efficacy of Peer Revision in Process-oriented Writing

Peer revision is a collaborative activity during which student writers can exchange drafts and make suggestions for improvement. It has been widely used at present in process-oriented writing instruction. In this paper, the researcher carried out an empirical study about the effects and efficacy of peer revision on a group of Chinese Juniors majoring in English. It was found that student writers focused specially on grammar and vocabulary in PE session and organization was the least attended to. PE was quite effective in improving the overall writing quality, as the participants did incorporate most of the revisions suggested by their peers. However, the influences of students'writing proficiencies and of the rhetorical modes of the writing tasks on the effects of PE were proved to be not very significant.

TS-1光催化剂的制备及应用研究进展

钛硅分子筛(TS-1)因具有优异的吸附能力、高选择性的催化活性中心和良好的稳定性而成为一类具有应用潜力的光催化材料。然而,其活性仍受限于电荷分离较低和光吸收不足。在众多光催化剂改性方法中,构建异质光催化体系具有简单可行、形式多样和性能突出等优点,在能源环境方面具有广阔的应用前景。本文总结了TS-1的制备方法、提出了与碳材料偶联、金属/非金属掺杂、贵金属负载和与半导体异质复合4种策略来TS-1光催化活性,分析了TS-1异质光催化剂在水分解制氢、CO 2还原和污染物的降解应用方面的研究现状。

临河方言[ts]组声母研究

临河方言[ts]组声母古音来源除了精组以外,知组、庄组、章组声母存在不同程度的异读(自由变读和条件变读)情况。以临河方言音系为切入点,依据《方言调查字表》的古音系统及研究的具体需要,分别对精组、知二庄二组、知三庄三章组异读情况进行讨论,从而解释临河方言中[]组字声母产生变读的原因,确定临河方言中知庄章组声母演变类型,对认识临河方言知庄章组演变类型研究在整个阴山地区晋语研究中的地位有着重大意义。