Effects of drought on non-structural carbohydrates and C,N,and P stoichiometric characteristics of Pinus yunnanensis seedlings

To study non-structural carbohydrate character-istics and nutrient utilization strategies of Pinus yunnanen-sis under continuous drought conditions,2-year-old seed-lings were planted in pots with appropriate water,light and moderate and severe drought treatments[(80±5),(65±5),(50±5),and(35±5)%of field water-holding capacity].Non-structural carbohydrates,carbon(C),nitrogen(N),and phosphorus(P)concentrations were measured in each plant component.The results show that:(1)With increasing drought,non-structural carbohydrates gradually increased in leaves,stems,and coarse roots,while gradually decreased in fine roots;(2)C concentrations of all were relatively stable under different stress levels.Phosphorous utilization of each component increased under light and moderate drought conditions,while N and P utilization efficiency of each plant component decreased under severe drought.Growth was mainly restricted by N,first decreasing and then increasing with increased drought;(3)There was a correlation between the levels of non-structural carbohydrates and C,N,and P in each component.Changes in N concentration affected the interconversion between soluble sugar and starch,which play a regulatory role in the fluctuation of the concentration of non-structural carbohydrates;and,(4)Plasticity analysis showed that P.yunnanensis seedlings responded to drought mainly by altering starch concentration,the ratio of soluble sugar to starch in leaves and stems,and further by alter-ing N and P utilization efficiencies.Overall,these results suggest that the physiological activities of all organs of P.yunnanensis seedlings are restricted under drought and that trade-offs exist between different physiological indicators and organs.Our findings are helpful in understanding non-structural carbohydrate and nutrient adaptation mechanisms under drought in P.yunnanensis seedlings.

CHMP4C通过调控PI3K/AKT信号通路影响NSCLC细胞增殖与凋亡

目的:探究染色质修饰蛋白4C(CHMP4C)对非小细胞肺癌(NSCLC)进展及顺铂敏感性的影响及其机制。方法:通过免疫组化检测CHMP4C在NSCLC癌组织和癌旁组织中的表达情况。利用实时荧光定量PCR(RT-qPCR)和蛋白免疫印迹法(Western blot)检测CHMP4C在NSCLC细胞系中的表达水平。细胞计数试剂盒(CCK-8)和细胞克隆实验检测细胞活力及半数抑制浓度IC50;流式细胞术检测细胞周期和凋亡。Western blot分析细胞凋亡相关蛋白(caspase 3、Bad)及PI3K/AKT信号通路中关键蛋白的表达水平。另外,我们采用动物模型进一步验证CHMP4C对体内肿瘤生长的影响。结果:CHMP4C在NSCLC癌组织和细胞系中高表达,与肿瘤T分期显著相关(P<0.05)。敲低CHMP4C抑制细胞增殖,促进细胞凋亡,并将细胞阻滞在S期(P<0.05)。敲低CHMP4C可抑制PI3K/AKT信号通路活化,然而激活PI3K/AKT信号通路逆转了CHMP4C敲低对NSCLC细胞的影响(P<0.05)。利用顺铂处理细胞后发现NSCLC细胞生长受抑制,且CHMP4C表达降低;敲低CHMP4C联合顺铂治疗明显诱导肿瘤细胞凋亡,抑制肿瘤细胞增殖(P<0.05)。在动物实验中,CHMP4C敲低的肿瘤体积小于对照组,其ki67表达显著降低,而caspase 3表达升高(P<0.05)。结论:CHMP4C在NSCLC癌组织及细胞系中高表达,在体内及体外实验中敲低CHMP4C可抑制NSCLC细胞增殖,促进细胞凋亡,增强顺铂治疗的敏感性;CHMP4C可能通过PI3K/AKT信号通路参与NSCLC进展与顺铂耐药。

二烯丙基二硫通过磷酸化Chk1负调控Cdc25C/CyclinB1/CDK1通路阻滞白血病K562细胞G_(2)/M期

目的:研究二烯丙基二硫(diallyl disulfide,DADS)诱导人白血病K562细胞周期阻滞及其分子机制。方法:采用CCK-8、细胞计数及流式细胞术观察DADS对K562细胞增殖与周期阻滞效应。Western Blot检测DADS对K562细胞PCNA、Chk1/2以及下游分子Cdc25C、CyclinB1与CDK1表达的影响。结果:CCK-8检测显示,15μmol/L、30μmol/L、60μmol/L、120μmol/L、240μmol/L DADS处理后,呈浓度依赖性抑制K562细胞增殖,抑制率分别为32.48%、59.34%、66.42%、77.06%、81.05%(P<0.05)。对照组与Tween80组无抑制作用(P>0.05)。细胞计数结果显示,30μmol/L、60μmol/L与120μmol/L DADS处理K562细胞后,群体倍增时间分别为22.71±0.29、36.69±0.93与73.02±0.87呈浓度依赖性增加(P<0.05),而Tween80组与对照组无明显差异(P>0.05)。流式细胞术检测显示,60μmol/L与120μmol/L DADS作用K562细胞24 h与48 h后,G_(2)/M期百分率分别增加到17.6%与28.5%和18.6%与34.4%,较对照组有显著性差异(P<0.05)。60μmol/L DADS作用K562细胞1 h、2 h、4 h、8 h和24 h后,PCNA表达呈时间依赖性表达下调(P<0.05)。p-Chk1表达呈时间依赖性上调(P<0.05),而Chk1、Chk2与p-Chk2表达无明显差异(P>0.05)。并且,Cdc25C、CyclinB1和CDK1分别呈时间依赖性下调(P<0.05),但是,14-3-3蛋白无明显改变(P>0.05)。结论:DADS可磷酸化Chk1通过Cdc25C/CyclinB1/CDK1通路抑制K562细胞增殖与阻滞G_(2)/M期。

Loss of LBP triggers lipid metabolic disorder through H3K27 acetylation-mediated C/EBPβ-SCD activation in non-alcoholic fatty liver disease

Non-alcoholic fatty liver disease(NAFLD)is associated with mutations in lipopolysaccharide-binding protein(LBP),but the underlying epigenetic mechanisms remain understudied.Herein,LBP^(-/-)rats with NAFLD were established and used to conduct integrative targetingactive enhancer histone H3 lysine 27 acetylation(H3K27ac)chromatin immunoprecipitation coupled with high-throughput and transcriptomic sequencing analysis to explore the potential epigenetic pathomechanisms of active enhancers of NAFLD exacerbation upon LBP deficiency.Notably,LBP^(-/-)reduced the inflammatory response but markedly aggravated high-fat diet(HFD)-induced NAFLD in rats,with pronounced alterations in the histone acetylome and regulatory transcriptome.In total,1128 differential enhancer-target genes significantly enriched in cholesterol and fatty acid metabolism were identified between wild-type(WT)and LBP^(-/-)NAFLD rats.Based on integrative analysis,CCAAT/enhancer-binding proteinβ(C/EBPβ)was identified as a pivotal transcription factor(TF)and contributor to dysregulated histone acetylome H3K27ac,and the lipid metabolism gene SCD was identified as a downstream effector exacerbating NAFLD.This study not only broadens our understanding of the essential role of LBP in the pathogenesis of NAFLD from an epigenetics perspective but also identifies key TF C/EBPβand functional gene SCD as potential regulators and therapeutic targets.

芪丹颗粒通过促进CTRP3激活PI3K/AKT信号通路改善脂肪细胞胰岛素抵抗

【目的】探究芪丹颗粒抗脂肪细胞胰岛素抵抗(IR)机制。【方法】采用棕榈酸培养法诱导3T3-L1脂肪细胞IR模型,设空白对照组,模型组,芪丹颗粒低、中、高剂量组,芪丹颗粒+C1q/TNF相关蛋白3(CTRP3)siRNA组。测定细胞上清中葡萄糖消耗量;采用酶联免疫吸附分析(ELISA)法测定细胞上清中肿瘤坏死因子α(TNF-α)和白细胞介素6(IL-6)含量;实时定量聚合酶链反应(qRT-PCR)法检测细胞CTRP3、TNF-α、IL-6、葡萄糖转运蛋白4(GLUT4)基因表达;Western Blot法检测细胞中CTRP3、磷脂酰肌醇-3激酶(PI3K)、蛋白激酶B(AKT)的蛋白表达及其磷酸化水平。【结果】与模型组比较,芪丹颗粒中、高剂量组的葡萄糖消耗量升高并趋于空白对照组的70%~82%,TNF-α含量降低了25%~45%,IL-6含量下降了40%~55%,GLUT4 mRNA表达水平增加了50%,CTRP3 mRNA及蛋白表达水平增加了25%~40%(均P<0.05);与芪丹颗粒组比较,芪丹颗粒+CTRP3 siRNA组的葡萄糖消耗量和GLUT4 mRNA表达水平分别降低了33%和27%,IL-6和TNF-α的含量分别增加了42%和41%,p-PI3K和p-AKT的蛋白表达水平增加了190%和180%(均P<0.05)。【结论】芪丹颗粒可能通过促进CTRP3表达降低炎症反应和激活PI3K/AKT信号通路来提高IR 3T3-L1脂肪细胞的胰岛素敏感性,改善脂肪细胞IR。

Stability analysis of intermittently jointed rock slopes based on the stepped failure mode

In practical engineering,due to the noncontinuity characteristics of joints in rock slopes,in addition to plane failure,stepped sliding failure may occur for intermittently jointed rock slopes.Especially for intermittently bedding jointed rock slopes,the correlation and difference in strength parameters between joints and rock bridges,along with the various failure modes and intermittency of rock bridges,contribute to the complexity of stepped failure modes and the unpredictability of failure regions.Based on the upper-bound limit analysis method and multi-sliders step-path failure mode,considering the shear and tensile failure of rock bridges and the weakened relationship between the strength parameters of rock bridges and jointed surfaces,by introducing the modified M-C failure criterion and the formula for calculating the energy consumption of tensile failure of rock bridges,two failure mechanisms are constructed to obtain the safety factor(F_(s))of intermittently jointed rock slopes.The sequential quadratic programming method is used to obtain the optimal upper-bound solution for F_(s).The influence of multiple key parameters(slope height H,horizontal distance L,Slope angleβ,shear strength parameters of the rock bridgeφr and cr,Dimensionless parameter u,weakening coefficients of the internal friction angle and cohesion between the rock bridges and joint surfaces Kφand Kc)on the stability analysis of intermittently jointed rock slopes under the shear failure mode of rock bridges as well as under the tensile failure mode is also explored.The reliability of the failure mechanisms is verified by comparative analysis with theoretical results,numerical results,and landslide cases,and the variation rules of F_(s)with each key parameter are obtained.The results show that F_(s) varies linearly withφr and cr of the rock bridge and with K_(φ)and K_(c),whereas F_(s)changes nonlinearly with H and L.In particular,with the increase in Kφand Kc,Fs increases by approximately 52.78%and 171.02%on average,respectively.For rock bridge tensile failure,F_(s) shows a nonlinearly positive correlation withφr,cr,Kφand Kc.In particular,with the increase in Kφand Kc,Fs increases by approximately 13%and 61.69%on average,respectively.Fs decreases rapidly with increasing slope gradientβand decreasing dimensionless parameterμ.When Kφand Kc are both less than 1.0,the stepped sliding surface occurs more easily than the plane failure surface,especially in the case of tensile failure of the rock bridge.In addition,rock slopes with higher strength parameters,taller heights,and greater weakening coefficients are prone to rock bridge tension failure with lower Fs,and more attention should be given to the occurrence of such accidents in actual engineering.

加拿大BC省K-9年级数学课程标准特点及启示

加拿大BC省K-9年级新版数学课程标准的主要特点在于确立核心素养导向的课程目标,旨在培养高素质公民;构建三位一体的课程模式,强调理论与实践并重;设计结构化的课程内容,注重知识内在逻辑;关注多元文化,突出土著文化的全面融入。借鉴加拿大BC省数学课程改革的经验及特点,结合我国基础教育数学课程改革的实际,建议进一步明确数学课程性质,精准定位课程目标;加强课程内容整合,积极构建连贯灵活的课程体系;兼顾核心思想和能力培养,突出金融素养养成;创设个性化和信息化的教学环境,注重持续评估与指导。

维生素C与热处理通过PI3K/AKT/HIF-1α通路对肺癌A549细胞增殖的作用

目的探讨维生素C与热处理对肺癌A549细胞的作用及相关机制。方法应用不同浓度的维生素C(终浓度0、1、2、4、8 mmol/L)与不同温度(37℃和41℃)作用于A549细胞,采用CCK8法检测细胞活性,FRASC维生素C检测分析试剂盒Ⅱ检测细胞内总维生素C的浓度;然后分为对照组(37℃,0 mmol/L维生素C)、维生素C组(37℃,8 mmol/L维生素C)、热处理组(41℃,0 mmol/L维生素C)、联合组(41℃,8 mmol/L维生素C)干预24 h,荧光标记2-脱氧葡萄糖(2-NBDG)检测A549细胞葡萄糖摄取量,蛋白质印迹检测GLUT1、GLUT3、PI3K、AKT、p-PI3K、p-AKT、HIF-1α蛋白表达水平,检测结果均应用方差分析及LST-t检验进行统计分析。结果A549细胞活力随维生素C浓度增加而下降(P<0.05),41℃热处理的细胞在维生素C干预后的细胞活力均低于37℃(P<0.05);细胞内总维生素C水平随干预浓度增加而升高,热处理的细胞在2、4、8 mmol/L维生素C干预后,细胞内维生素C水平均高于37℃(P<0.05);分组干预后,与对照组相比,维生素C组、热处理组及联合组的细胞内葡萄糖摄取量均降低(P<0.05),且热处理组低于维生素C组(P<0.05),而联合组又低于维生素C组和热处理组(P<0.05);三个干预组的GLUT1、PI3K、p-PI3K、p-AKT蛋白表达水平均低于对照组(P<0.05),维生素C组的GLUT3、HIF-1α,及联合组的GLUT3、HIF-1α、AKT均低于对照组(P<0.05);联合组的GLUT1、PI3K、p-PI3K蛋白表达水平低于维生素C组(P<0.05),联合组的GLUT3、AKT、p-PI3K、HIF-1α均低于维生素C组和热处理组(P<0.05)。结论维生素C联合热处理显著地抑制A549细胞PI3K/AKT/HIF-1α通路,下调GLUT1和GLUT3的表达,减少细胞内的葡萄糖摄取,抑制A549细胞增殖。

社交电商平台小红书的B2K2C商业模式研究

互联网技术飞速发展,商业模式也在不断转换,用户的消费水平随之提高,出现了诸多网络购物平台,区别于其他的电商App,小红书App的商业模式相对特殊,这种“社交+内容+电商”的模式,具有良好的发展前景。基于此,本文从小红书App的商业模式入手,明确其发展历程,分析这一商业模式中的相关因素,提出具体的商业模式,进而明确社交电商平台后续的发展方向,落实相应的改革创新策略,让社交电商平台得到更好的发展。

北京广播电视台C波段卫星车的4K升级改造

为满足超高清信号外场直播卫星传输需求,北京广播电视台基于已有C波段高清卫星车设计了一整套卫星车改装方案,并在已有卫星车基础上对该设计方案进行了实际建设。文章全面介绍了改装升级思路及具体建设过程,测试结果满足技术标准。

海南广播电视总台C波段卫星车4K升级改造

随着5G网络技术的发展和商用,卫星传送方式依然有比5G传送时延低、稳定性好、安全等优势,因此,在重要会议和重要活动中依然作为传输的主力军。为适应4K技术的发展,本文通过对海南广播电视总台现有的C波段卫星车技术现状进行分析,提出一种4K改造的可行性方案,并对改造的C波段卫星车载融合媒体进行了构想。

维生素K、快速CRP、WBC在儿童腹泻感染类型诊断中的价值探究

目的探究维生素K、快速C-反应蛋白(CRP)、白细胞计数(WBC)在儿童腹泻感染类型诊断中的价值。方法选取腹泻患儿90例,按照病原体不同分为细菌性腹泻组(n=58)、病毒性腹泻组(n=17)和非感染性腹泻组(n=15),选取同期体检的90例健康者为对照组。对比各组维生素K、CRP、WBC水平,并评价上述指标对儿童腹泻感染类型的诊断价值。结果腹泻组CRP、WBC水平均高于对照组,维生素K水平低于对照组(P<0.05);治疗后CRP、WBC水平低于治疗前,维生素K水平高于治疗前(P<0.05);细菌性腹泻组CRP、WBC水平均大于病毒性腹泻组和非感染性腹泻组,维生素K水平低于病毒性腹泻组和非感染性腹泻组(P<0.05);病毒性腹泻组CRP、WBC水平均大于非感染性腹泻组,维生素K水平低于非感染性腹泻组(P<0.05);细菌性腹泻组CRP、WBC及维生素K阳性率均高于病毒性腹泻组和非感染性腹泻组(P<0.05);CRP、WBC、维生素K水平及三者联合诊断对儿童细菌性腹泻与非细菌性腹泻诊断的ROC曲线显示,CRP、WBC、维生素K水平的最佳截断值分别为5.13mg/L、11.06×10^(9)/L、0.081ng/mL时,联合诊断的AUC为0.776均高于单独诊断的0.685、0.682、0.693(P<0.05)。结论维生素K、CRP、WBC联合检测对儿童细菌性腹泻与非细菌性腹泻的诊断具有一定临床意义。

Characteristics of Milankovitch Cycles in the Mid-Permian Liangshan and Qixia Formations of the Sichuan Basin——Examples from Well-Long17 and Well-Wujia1

The Liangshan and Qixia formations in the Sichuan Basin of central China were formed in the earlier middle Permian. Based on outcrop observation of the Changjianggou section at Shangsi, Guangyuan region and 3 rd -order sequence division in typical drillings, one-dimensional spectrum analysis has been used to choose the better curve between the natural gamma ray spectrometry log（ln （Th/K）） in Well-Long17 and the gamma ray log（GR） in Well-Wujia1, respectively, for identifying Milankovitch cycles in Sequence PSQ1 which comprises the Liangshan and Qixia formations, and then to identify the variation in the Milankovitch cycle sequences. On this basis, the system tract and 4 th -order sequence interfaces in Sequence PSQ1 were found via two-dimensional spectral analysis and digital filtering. Finally, a high-frequency sequence division program was established. Among these cycles, long eccentricity （413.0 ka） and short eccentricity （123.0 ka） are the most unambiguous, and they are separately the major control factors in forming 4 th -order （parasequence sets） and 5 th -order （parasequences） sequences, with the average thicknesses corresponding to the main cycles being 11.47 m and 3.32 m in Well-Long17, and 14.21 m and 3.79 m in Well-Wujia1, respectively. In other words, the deposition rate in the beach subfacies is faster than that of the inner ramp facies. The ln（Th/K） curve is more sensitive than the GR as the index of relatively ancient water depth in carbonate deposition. One-dimensional spectrum analysis of ln（Th/K） curve could distinguish the Milankovitch cycle sequences that arose from the Precession cycle （20.90 ka）, with a much higher credibility. Sequence PSQ1 in Well-Long17 contains 10 4 th -order sequences, and the growth span of Sequence PSQ1 consisting of the Liangshan and Qixia formations is about 4.13 Ma. The single deposition thickness of the long eccentricity cycle sequence has the characteristics of thinning and then thickening in the two-dimensional spectrum, which could be used to identify the system tract interface of the 3 rd -order sequence. The precession sequence thickness remains stationary. As a result, the early deposition rate in the mid-Permian of the Sichuan basin was very slow, remaining nearly stationary, and this reflects a sustained depositional environment. Whole-rock carbon and oxygen isotope curves could also prove this point. Milankovitch cycle sequence studies provide a basis for paleoenvironmental analysis and, as such, can be used to analyze ancient climate change, calculate deposition rate and deposition time, and carry out fine isochronous stratigraphic correlation.

Tribological characteristics of C/C-SiC braking composites under dry and wet conditions

C/C-SiC braking composites,based on reinforcement of carbon fibers and matrices of carbon and silicon carbide,were fabricated by warm compaction and in situ reaction process.The tribological characteristics of C/C-SiC braking composites under dry and wet conditions were investigated by means of MM-1000 type of friction testing machine.The influence of dry and wet conditions on the tribological characteristics of the C/C-SiC composites was ascertained.Under dry condition,C/C-SiC braking composites show superior tribological characteristics,including high coefficient of friction (0.38),good abrasive resistance (thickness loss is 1.10 μm per cycle) and steady breaking.The main wear mechanism is plastic deformation and abrasion caused by plough.Under wet condition,frictional films form on the worn surface.The coefficient of friction (0.35) could maintain mostly,and the thickness loss (0.70 μm per cycle) reduces to a certain extent.Furthermore,braking curves are steady and adhesion and oxidation are the main wear mechanisms.

Real-time road traffic states estimation based on kernel-KNN matching of road traffic spatial characteristics

The accurate estimation of road traffic states can provide decision making for travelers and traffic managers. In this work,an algorithm based on kernel-k nearest neighbor(KNN) matching of road traffic spatial characteristics is presented to estimate road traffic states. Firstly, the representative road traffic state data were extracted to establish the reference sequences of road traffic running characteristics(RSRTRC). Secondly, the spatial road traffic state data sequence was selected and the kernel function was constructed, with which the spatial road traffic data sequence could be mapped into a high dimensional feature space. Thirdly, the referenced and current spatial road traffic data sequences were extracted and the Euclidean distances in the feature space between them were obtained. Finally, the road traffic states were estimated from weighted averages of the selected k road traffic states, which corresponded to the nearest Euclidean distances. Several typical links in Beijing were adopted for case studies. The final results of the experiments show that the accuracy of this algorithm for estimating speed and volume is 95.27% and 91.32% respectively, which prove that this road traffic states estimation approach based on kernel-KNN matching of road traffic spatial characteristics is feasible and can achieve a high accuracy.

The Non-standard Characteristics of Functional SpacesK(X) and C_0(X)

In this paper,the non standard characteristics of functional spaces K(X) and C 0(X) are presented and proved.

Temperature Dependence of Electrical Characteristics in Indium-Zinc-Oxide Thin Film Transistors from 10 K to 400 K

The transfer characteristics of amorphous indium-zinc-oxide thin film transistors are measured in the temperature range of 10-400K. The variation of electrical parameters （threshold voltage, field effect mobility, sub-threshold swing, and leafage current） with decreasing temperature are then extracted and analyzed. Moreover, the dom- inated carrier transport mechanisms at different temperature regions are investigated. The experimental data show that the carrier transport mechanism may change from trap-limited conduction to variable range hopping conduction at lower temperature. Moreover, the field effect mobilities are also extracted and simulated at various temperatures.

Quality Characteristics and FTIR Research of Amorphophallus konjac K. Koch Cultivated under Forest

[Objectives]This study aimed to evaluate the quality characteristics of Amorphophallus konjac K.Koch and study the tubers of A.konjac K.Koch by infrared spectroscopy and second derivative method.[Methods]Referring to industrial standards of China for agriculture and related documents,the quality characteristics of A.konjac K.Koch were determined;and using potassium bromide tableting method and Fourier transform infrared spectroscopy,the infrared spectrum and second derivative spectrum of A.konjac K.Koch were studied.[Results]The drying rate,total ash content,acid-insoluble ash content,water extract content,ethanol extract content and crude polysaccharide content of A.konjac K.Koch were above 14.00%,4.57%-11.78%,0.04%-4.87%,26.31%-36.98%,2.20%-7.95%and 40.25%-61.18%,respectively.The infrared spectra of A.konjac K.Koch of different origins were relatively close,and the differences were mainly in peak intensity.The peaks at 1642,1322,1241,1154,1022,863,770 and 576 cm-1 were the main specific peaks.The main component was konjac glucomannan.[Conclusions]FTIR technology is simple and quick,and is suitable for quality control and sample identification of A.konjac K.Koch.This provides a scientific basis for the quality control and comprehensive utilization of A.konjac K.Koch cultivated under forest.

Analysis of the Self-Protection Characteristics of a 1.5T Bitter-Like HTS Magnet Operated at 65K

We present a conceptual configuration of a high-temperature superconducting（HTS）magnet made from REBCO（Re=Rare Earth,B=Barium,C=Copper,O=Oxide）annular plates,called a Bitter-like HTS magnet,which can operate in persistent current mode without joint resistance and can be excited by a flux pump and without current leads and a persistent power supply.An REBCO annular magnet which can generate 1.5 T corresponding to the operating current density 80%of critical current density of the magnet at an operating temperature of65 K is conceptually designed.Then the thermal stability of the magnet is numerically simulated by Comsol software.Whein a piece of RBCO annular plate quenches,the maximum released energy is its stored energy because each REBCO annular plate in the Bitter-like magnet is in parallel.To calculate the stored energy in the REBCO annular plate,the inductance of every annular plate,including self-inductance and mutual inductance,is calculated.Compared with the minimum quench energy（MQE）and stored energy in one REBCO annular plate,the stored energy in one REBCO annular plate is always smaller than the MQE,and the REBCO annular plate will not be damaged even though the stored energy in the REBCO annular plate is fully released,which indicates that this 1.5 T Bitter-like magnet has the property of self-protection.

Discussion on “Optimum placement and characteristics of velocity-dependent dampers under seismic excitation” by Seyed Amin Mousavi and Amir K. Ghorbani-Tanha

The authors presented an interesting aspect in viscous or visco-elastic damper optimization under earthquake excitation. They also reviewed the research development in the field of passive damper optimization.