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Real-time time-dependent density functional theory study of electronic stopping power of magnesium for protons 认领 引用
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作者 Yu-Qi Chen Ge-Ge Xiong +2 位作者 Zi-Xi Xiao Lei Ye Fei Mao 《Communications in Theoretical Physics》 SCIE CAS CSCD 2026年第4期59-66,共8页
The electronic stopping power of magnesium(Mg)for protons is studied over a wide range of velocities by performing real-time time-dependent density functional theory(TDDFT)simulations.The electronic stopping power of ... The electronic stopping power of magnesium(Mg)for protons is studied over a wide range of velocities by performing real-time time-dependent density functional theory(TDDFT)simulations.The electronic stopping power of Mg for high-velocity protons traveling along both channeling and off-channeling trajectories is calculated,and the microscopic mechanism responsible for the innerelectron excitation of Mg is revealed.In the low-velocity range(v<1 au),the stopping power calculated from the channeling geometry aligns closely with the experimental measurements.It captures the departure from the linear relationship between the stopping power and proton velocity,which is attributed to charge exchange effect between protons and host electrons.The threshold velocities for 2p and 2s electron excitation of Mg for protons were found by TDDFT calculations.In the high-velocity range,the dependence of 2s-electron excitation on the impact parameter was investigated.Compared to channeling stopping,the off-channeling stopping exhibits significant enhancement.Furthermore,the impact of ion trajectories on electron excitation was also investigated.The results confirmed that the 3s electron excitation makes a significant contribution,and the decrease of the impact parameter enhances the inner electron excitation. 展开更多
关键词 electronic stopping power electronic excitation electronic energy loss TDDFT
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基于STOP行为观察的大学生学习行为研究 认领 引用
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作者 张盈盈 薛淑萍 +2 位作者 骆柯嘉 索若淇 张泽林 《吕梁学院学报》 2025年第2期92-95,100,共4页
大学生的学习行为显著影响学习效率和学习质量.如何纠正大学生的不良学习行为、提高学习质量,是高校教学改革和人才培养的重要问题.本文基于杜邦STOP行为观察方法,结合PDCA动态循环构建了大学生学习行为观察模型,统计了某高校安全工程... 大学生的学习行为显著影响学习效率和学习质量.如何纠正大学生的不良学习行为、提高学习质量,是高校教学改革和人才培养的重要问题.本文基于杜邦STOP行为观察方法,结合PDCA动态循环构建了大学生学习行为观察模型,统计了某高校安全工程专业大学生的不良学习行为,并应用层次分析法定量分析了不良学习行为对学习质量的影响.研究表明,大学生学习质量的影响因素排序为:课堂学习行为>课外学习行为>学习环境因素.在课堂学习行为中,未按时上课、玩电子产品、未参与课堂互动等因素的影响较明显;在课外学习行为中,作业抄袭、思考少、学习进度拖沓等因素的影响较大;在学习环境因素中,噪声大、照明不足等因素影响较大. 展开更多
关键词 STOP行为观察 层次分析法 大学生学习行为
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Modeling stopping power of ions in plasmas using parametric potentials 认领 引用
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作者 Tanguy Barges Delattre Sébastien Rassou Jean-Christophe Pain 《Matter and Radiation at Extremes》 SCIE EI CAS CSCD 2025年第6期86-100,共15页
We present a study of the ion stopping power due to free and bound electrons in a warm dense plasma.Our main goal is to propose a method of stopping-power calculation expected to be valid for any ionization degree.The... We present a study of the ion stopping power due to free and bound electrons in a warm dense plasma.Our main goal is to propose a method of stopping-power calculation expected to be valid for any ionization degree.The free-electron contribution is described by the Maynard–Deutsch–Zimmerman formula,and the bound-electron contribution relies on the Bethe formula with corrections,in particular taking into account density and shell effects.The results of the bound-state computation using three different parametric potentials are investigated within the Garbet formalism for the mean excitation energy.The first parametric potential is due to Green,Sellin,and Zachor,the second one was proposed by Yunta,and the third one was introduced by Klapisch in the framework of atomic-structure computations.The results are compared with those of self-consistent average-atom calculations.This approach correctly bridges the limits of neutral and fully ionized matter. 展开更多
关键词 warm dense plasmaour free bound electrons maynard deutsch zimmerman formulaand parametric potentials ion stopping power bethe formula free electrons bound electrons
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Integrated optimization of train stopping plans and timetabling for urban rail transit based on dynamic demand 认领 引用
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作者 Jiayao Han Qiuchi Xue +2 位作者 Ye Yuan Xin Yang Jianjun Wu 《Digital Transportation and Safety》 2025年第1期42-49,共8页
This study addresses the higher demand of passengers during peak hours in urban rail transit by proposing an integrated optimization of train stopping plans and timetabling to reduce overcrowding and the total waiting... This study addresses the higher demand of passengers during peak hours in urban rail transit by proposing an integrated optimization of train stopping plans and timetabling to reduce overcrowding and the total waiting time.A nonlinear integer programming model is developed,incorporating passenger demand,operation costs,train capacity,and station congestion levels.The decision variables include the stopping plan and departure headways.The objective is to minimize total operation time,average operation time,and waiting time,while reducing congestion variance across stations.A case study using the NSGA-II algorithm shows that the optimized solution significantly alleviates station congestion compared to the all-stop plan.Additionally,it reduces average operation time,total operation time,and waiting time by 3.42%,9.40%,and 10.44%,respectively,demonstrating the model's feasibility and effectiveness. 展开更多
关键词 Timetable Train stopping plan Multi-objective optimization Nonlinear integer programming model Urban rail transit
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STOP-Bang问卷在慢性肾脏病患者中筛查阻塞性睡眠呼吸暂停综合征的价值 认领 引用
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作者 陈晓海 魏立新 +2 位作者 谢祖刚 张永乐 谢丽红 《福建医药杂志》 CAS 2025年第9期13-16,共4页
目的探讨STOP-Bang筛查问卷(SBQ)在慢性肾脏疾病(CKD)患者中筛查阻塞性睡眠呼吸暂停(OS-AS)的价值.方法分析经多导睡眠监测(PSG)的195例CKD患者的SBQ和PSG结果,根据慢性肾脏病流行病学合作研究公式(CKD-EPI)公式计算的估算肾小球滤过率(... 目的探讨STOP-Bang筛查问卷(SBQ)在慢性肾脏疾病(CKD)患者中筛查阻塞性睡眠呼吸暂停(OS-AS)的价值.方法分析经多导睡眠监测(PSG)的195例CKD患者的SBQ和PSG结果,根据慢性肾脏病流行病学合作研究公式(CKD-EPI)公式计算的估算肾小球滤过率(eGFR),进行分期分组,将患者分为CKD1~2期(70例)、CKD3~4期(74例)和CKD 5期(51例).计算不同CKD分期下SBQ的敏感性和特异性,并绘制受试者操作特征(ROC)曲线.结果随着eGFR下降,OSAS患病率呈现上升趋势,CKD 1~2期、CKD 3~4期和CKD 5期中重度OSAS的患病率分别为27.1%、51.4%和56.9%(χ2=13.113,P=0.001).当SBQ得分为特定值时(CKD3~4期和CKD5期为4分,CKD1~2期为3分),ROC曲线下面积(AUC)达到最大值,分别为0.798、0.763和0.824.结论SBQ对CKD合并中重度OSAS具有一定的预测价值,可用于该类疾病的筛查,值得临床推广应用. 展开更多
关键词 慢性肾脏病 阻塞性睡眠呼吸暂停低通气综合征 STOP-Bang问卷
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Advances in dual energy computed tomography approach for proton stopping power ratio computation in radiotherapy 认领 引用
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作者 Charles Ekene Chika 《World Journal of Radiology》 2025年第6期24-38,共15页
To address the sensitive and uncertain limitations of single-energy computed tomography(CT)calibration methods in computing proton stopping power ratio during treatment planning,different methods have been proposed us... To address the sensitive and uncertain limitations of single-energy computed tomography(CT)calibration methods in computing proton stopping power ratio during treatment planning,different methods have been proposed using a dual energy CT approach.This paper reviews the most recent dual-energy CT approaches for computing proton stopping power ratio.These include image domain and projection domain methods.The advantages and uncertainties of these methods are analyzed based on existing studies.This paper highlights recent advances in dual energy CT,discussing their implementation,advantages,limitations,and potential for clinical adoption. 展开更多
关键词 Dual energy computed tomography Stopping power ratio Machine learning Mathematical model Image domain Projection domain Radiotherapy Alternating minimization algorithm Electron density Mean excitation energy
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Ruling out small stopping sets and small girth in Tanner graph of QC-LDPC code 认领 引用 被引量：2
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作者 Lingjun Kong Yang Xiao 《Journal of Systems Engineering and Electronics》 SCIE EI 2010年第1期134-137,共4页
The existing constructions of quasi-cyclic low-density parity-check(QC-LDPC)codes do not consider the problems of small stopping sets and small girth together in the Tanner graph,while their existences will lead to th... The existing constructions of quasi-cyclic low-density parity-check(QC-LDPC)codes do not consider the problems of small stopping sets and small girth together in the Tanner graph,while their existences will lead to the bit error rate(BER)performance of QC-LDPC codes being much poorer than that of randomly constructed LDPC codes even decoding failure.To solve the problem,some theorems of the specific chosen parity-check matrix of QC-LDPC codes without small stopping sets and small girth are proposed.A novel construction for QC-LDPC codes with long block lengths is presented by multiplying mmin or the multiple of mmin,which is the minimum order of the identity matrix for the chosen parity-check matrix.The simulation results show that the specific chosen parity-check matrix of QC-LDPC codes can effectively avoid specified stopping sets and small girth and exhibit excellent BER performance than random LDPC codes with the same longer codes length. 展开更多
关键词 quasi-cyclic low-density parity-check codes stoppingset stopping distance girth circulant matrices
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Properties and Working Principle of Airstop Membranes 认领 引用 被引量：1
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作者 王洪 庞沙沙 《Journal of Donghua University(English Edition)》 EI CAS 2014年第5期664-667,共4页
In this paper,the surface and cross-section,pore size and distribution,contact angle and hydrostatic pressure of the membrane were tested.Then the membrane's working principle was analyzed and the stopping height ... In this paper,the surface and cross-section,pore size and distribution,contact angle and hydrostatic pressure of the membrane were tested.Then the membrane's working principle was analyzed and the stopping height of membranes with different pore sizes was calculated.It was found that the surface tension and pore size of the membrane were key factors to determine its stopping height. 展开更多
关键词 airstop membrane pore size contact angle stoppingheight
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Bus Scheduling Using a Skip-Stop Strategy Based on Stop Relevance 认领 引用
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作者 GUO Cong WANG Xiaolin +3 位作者 SU Wenheng SUN Feng GUO Zonghe HU Zhenda 《Wuhan University Journal of Natural Sciences》 CAS CSCD 2020年第5期469-476,共8页
This research aims to propose an efficient and economic operation mode for bus scheduling optimization by combining with the skip-stop buses and all-stop buses.The skip-stop tactics in bus operation provide service of... This research aims to propose an efficient and economic operation mode for bus scheduling optimization by combining with the skip-stop buses and all-stop buses.The skip-stop tactics in bus operation provide service of high efficiency,good punctuality and high speed for long distance commuters,which attracts wide scholarly attention.This paper establishes a model to quantitatively evaluate the relevance between stops,and then develops a new optimization method of skip-stop tactics using the data sets of IC card and bus GPS trajectory.A collaborating scheduling optimization model considering the support and confidence among the stops is proposed to precisely suit passengers’demands and improve bus service.The optimization objective is to reduce the passengers’total travel time,the number of vehicles in use,and operation energy for both the user’s and the operator’s benefits.This methodology is developed for a single-directional route using a multi-decision choice model with genetic algorithm applied to attain efficient solutions.A case study of Qingdao,which is assessed in this new model,shows a reduction of 18.31%in total passenger travel time and 17.65%in the operational inputs as compared with solutions that do not consider the skip-stop tactics. 展开更多
关键词 bus IC card data stop relevance skip-stop operation bus scheduling
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一种面向Stop/Move抽象的轨迹时空关系 认领 引用 被引量：9
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作者 向隆刚 龚健雅 +1 位作者 吴涛 李文海 《武汉大学学报（信息科学版）》 EI CAS CSCD 北大核心 2014年第8期956-962,共7页
从轨迹Stop/Move模型出发,基于Stop/Move对象来分析轨迹之间复杂的时空关系。首先扩展Stop/Move模型,提出关联于地理空间要素的时空关联Stop/Move模型,在此基础上,以Stop/Move对象为分析粒度,分析Stop/Move对象在地理空间中的拓扑关系,... 从轨迹Stop/Move模型出发,基于Stop/Move对象来分析轨迹之间复杂的时空关系。首先扩展Stop/Move模型,提出关联于地理空间要素的时空关联Stop/Move模型,在此基础上,以Stop/Move对象为分析粒度,分析Stop/Move对象在地理空间中的拓扑关系,提出轨迹主体相对于地理空间要素的时空模式,接着从Stop-Stop、Stop-Move和Move-Move三方面重点研究轨迹时空模式之间的关联关系,最后以两个典型检索请求为例讨论该模式在轨迹时空关系分析方面的应用。 展开更多
关键词 轨迹 Stop/Move 时空关联 拓扑关系 时空模式
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柱花草SgSTOP1和SgSTOP2基因的克隆与表达分析 认领 引用 被引量：6
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作者 罗佳佳 向晨莹 +5 位作者 刘攀道 胡璇 唐军 王文强 刘国道 陈志坚 《草业科学》 CAS CSCD 2019年第3期704-712,共9页
铝毒是酸性土壤中限制作物生长和产量增加的主要因素之一。转录因子STOPs具有调控耐铝相关基因表达的功能,是植物耐铝毒的重要基因。本研究以耐铝柱花草(Stylosanthes guianensis)基因型‘TPRC2001-1’为材料,首次克隆到两个柱花草编码... 铝毒是酸性土壤中限制作物生长和产量增加的主要因素之一。转录因子STOPs具有调控耐铝相关基因表达的功能,是植物耐铝毒的重要基因。本研究以耐铝柱花草(Stylosanthes guianensis)基因型‘TPRC2001-1’为材料,首次克隆到两个柱花草编码锌指蛋白SgSTOP1和SgSTOP2基因。这两个基因cDNA全长分别为1 515和1 077 bp,编码504和358个氨基酸残基,蛋白分子量分别为56.2和39.7 kDa。亚细胞定位预测表明,SgSTOP1和SgSTOP2均定位于细胞核中。并且,SgSTOP1和SgSTOP2均为ZF-C_2H_2家族成员,SgSTOP1和SgSTOP2均包含4个保守的锌指结构域。定量PCR结果表明,铝毒胁迫显著增强SgSTOP1在‘TPRC2001-1’根和叶中的表达(P 0.05),暗示SgSTOP1基因可能参与柱花草对铝毒胁迫的应答过程。本研究结果为进一步解析柱花草适应铝毒胁迫的分子调控机制提供了候选基因资源。 展开更多
关键词 酸性土壤 铝毒 柱花草 STOPs 锌指蛋白 基因表达
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Reasonable location of stopping line in close‑distance underlying coal seam and partition support of large cross‑section roadway 认领 引用 被引量：10
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作者 Dongdong Chen Yiyi Wu +3 位作者 Shengrong Xie Fangfang Guo Fulian He Ruipeng Liu 《International Journal of Coal Science & Technology》 EI CAS CSCD 2022年第4期181-202,共22页
Close-distance coal seams are widely distributed over China,and the coal pillars left by the overlying coal seams afect the retracement channel of the underlying coal seam in the stopping stage.Based on the engineerin... Close-distance coal seams are widely distributed over China,and the coal pillars left by the overlying coal seams afect the retracement channel of the underlying coal seam in the stopping stage.Based on the engineering background of close-distance seam mining in a coal mine,the reasonable position of the underlying coal seam's stopping line and the support method of the large section roadway during stopping are investigated using feld measurements,similar simulation experiments,and numerical simulations.There are three types of location relationships between the stopping line of the underlying coal seam and the stopping line of the overlying coal seam:"externally staggered with the upper stopping line"(ESUL,stops mining under the overlying goaf),"overlapped with upper stopping line"(OUL),and"internally staggered with the upper stopping line"(ISUL,ISUL-SD for shorter internal staggered distances,ISUL-LD for longer ones).There are diferent stress arch structures in the overlying strata of the above three positions,and the stress arch evolution process exists in the process of ESUL→OUL→ISUL-SD→ISUL-LD:a front and rear double stress arch structure→the front arch gradually decreases→the front arch dies out,and the double arch synthesizes the single arch→the single-arch range expands→the nested double arch.The relationship between the stress arch structure and the position of the stopping line is evaluated as follows:(1)ESUL:the stress concentration in the roof plate of the retracement channel of the underlying coal seam is the highest,because the overburden block of the extensive collapse zone acts directly on the roof plate of the retracement channel,resulting in relative difculties in roof support.(2)OUL:although the retracement channel roof pressure is minimal,the overlying rock structure has the potential for rotation or slippage instability.(3)ISUL-SD:the pressure on the roof of the retracement channel is small and the overburden structure is stable,which is conducive to the safe retraction of the support and not limited by the width of the end-mining coal pillar.(4)ISUL-LD:it is basically the same as the condition of stopping under the non-goaf;however,it has a limitation on the width of the end-mining coal pillar.The location of the stopping line is selected as ISUL-SD,and the retraction process of the self-excavating retraction channel was adopted.A partition asymmetric support scheme which is proven by feld practice is proposed,through a comprehensive analysis of the pre-stress feld simulation of the support scheme,based on the diferent control requirements of the roof above the support and the roof of the retracement channel in the stopping area.This method realizes safe and smooth withdrawal of the support. 展开更多
关键词 Close-distance coal seams Stopping line Stress arch structure Retracement channel Partition support
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大豆耐铝毒候选基因GmSTOP1的克隆与表达分析 认领 引用 被引量：8
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作者 丛亚辉 王婷婷 +4 位作者 柳聚阁 王宁 高萌萌 李艳 盖钧镒 《作物学报》 CAS CSCD 北大核心 2015年第12期1802-1809,共8页
酸性土壤中的铝毒害是限制作物生长和产量的主要因素之一。拟南芥中的At STOP1(Arabidopsis thaliana sensitive to proton rhizotoxicity 1)是一个调控多种铝毒耐受机制相关基因表达的转录因子,在拟南芥耐铝毒中发挥重要作用。为研究... 酸性土壤中的铝毒害是限制作物生长和产量的主要因素之一。拟南芥中的At STOP1(Arabidopsis thaliana sensitive to proton rhizotoxicity 1)是一个调控多种铝毒耐受机制相关基因表达的转录因子,在拟南芥耐铝毒中发挥重要作用。为研究大豆中STOP1-like基因的表达特性,本研究利用RT-PCR从耐铝毒大豆品种科丰1号中克隆了一个位于第16染色体的STOP1-like基因,命名为Gm STOP1。该基因的编码区(coding DNA sequence,CDS)序列长度为1566 bp,编码521个氨基酸。在Gm STOP1起始密码子上游1500 bp的核苷酸序列区间预测到多种顺式作用元件,包括与激素、热、逆境响应等相关的应答元件,如ABRE、HSE、TC-rich重复序列等。蛋白质结构预测表明Gm STOP1不具有跨膜结构和信号肽,含有4个保守的Cys-2-His-2锌指蛋白结构域。系统进化分析显示Gm STOP1与菜豆(Phaseolus vulgaris)中的STOP1-like蛋白亲缘关系较近。亚细胞定位结果显示Gm STOP1定位于细胞核,说明Gm STOP1蛋白可能在细胞核中发挥其功能。Gm STOP1基因在种子中的相对表达量最高,在根、茎尖分生组织、茎、叶、花、荚等多种组织中也均有表达。用25μmol L–1 Al Cl3溶液处理大豆幼苗,Gm STOP1基因在根中上调表达,24 h达到最高相对表达量,约为对照(0μmol L–1 Al Cl3)的9.2倍,表明该基因的表达受铝离子的诱导。此外,ABA、Na Cl和PEG等胁迫也能诱导大豆根和叶中Gm STOP1基因的上调表达。由此推测Gm STOP1基因可能参与大豆对铝毒、高盐和渗透等非生物胁迫的应答过程。 展开更多
关键词 酸性土壤 铝毒 大豆 STOP1 亚细胞定位 荧光定量PCR
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葡萄耐铝毒基因STOP1的克隆与表达分析 认领 引用 被引量：5
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作者 张永福 徐仕琴 +2 位作者 陈姣 杨砚斌 任禛 《西南农业学报》 CSCD 北大核心 2022年第3期588-595,共8页
【目的】STOP1是植物耐铝毒的重要基因,为探明葡萄STOP1基因的结构特征及其表达量与其耐铝性的关系。【方法】以耐铝性弱的山葡萄(Vitis amurensis)和耐铝性强的小叶葡萄(V.sinocinerea)的叶片cDNA为模板,采用PCR和TA克隆技术获得VaSTOP... 【目的】STOP1是植物耐铝毒的重要基因,为探明葡萄STOP1基因的结构特征及其表达量与其耐铝性的关系。【方法】以耐铝性弱的山葡萄(Vitis amurensis)和耐铝性强的小叶葡萄(V.sinocinerea)的叶片cDNA为模板,采用PCR和TA克隆技术获得VaSTOP1和VsSTOP1两基因序列,对其进行生物信息学分析和铝胁迫下的表达分析,并测定铝胁迫下的膜脂过氧化指标,对2个种STOP1基因的表达和膜脂过氧化物质的变化与耐铝性的关系进行比较。【结果】克隆获得的VaSTOP1和VsSTOP1基因序列长度分别为1782和1800 bp,分别编码594和600个氨基酸,相对分子量分别为67.03和67.48 kD,理论等电点为5.21和6.42;二者的二级结构中均有无规则卷曲>α-螺旋>折叠延伸链的规律,由α-螺旋、β-折叠片、β-转角和锌指结构等组成三级空间结构;进化树研究得出,VaSTOP1与VsSTOP1的同源性高达96%,二者与CcSTOP1、PnSTOP1、NtSTOP1、ErSTOP1的同源性均在80%以上。VaSTOP1基因表达量在铝胁迫28 d内呈先上升后下降的规律,较早出现峰值,而VsSTOP1基因表达量则稳定上升,这与二者的膜脂过氧化物质的变化规律基本一致。【结论】葡萄的耐铝性与其STOP1基因的表达量呈正相关,研究为进一步探明葡萄耐铝毒的分子调控机制提供了基因资源。 展开更多
关键词 葡萄 STOP1基因 序列分析 基因表达 铝毒
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Mixed traffic flow modeling near Chinese bus stops and its applications 认领 引用 被引量：6
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作者 杨小宝 四兵锋 环梅 《Journal of Central South University》 SCIE EI CAS 2012年第9期2697-2704,共8页
To determine how bus stop design influences mixed traffic operation near Chinese bus stops,a new theoretical method was developed by using additive-conflict-flows procedure.The procedure was extended from homogeneous ... To determine how bus stop design influences mixed traffic operation near Chinese bus stops,a new theoretical method was developed by using additive-conflict-flows procedure.The procedure was extended from homogeneous traffic flow to mixed traffic flow.Based on the procedure and queuing theory,car capacity and speed models were proposed for three types of bus stops including curbside,bus bay and bicycle detour.The effects of various combinations of bus stop type,traffic volume,bus dwell time,and berth number on traffic operations were investigated.The results indicate that traffic volume,bus dwell time and berth number have negative effects on traffic operations for any type of bus stops.For different types of bus stops,at car volumes above approximately 200 vehicles per hour,the bus bay and bicycle detour designs provide more benefits than the curbside design.As traffic volume increases,the benefit firstly increases in uncongested conditions and then decreases in congested conditions.It reaches the maximum at car volumes nearly 1 100 vehicles per hour.The results can be used to aid in the selection of a preferred bus stop design for a given traffic volume in developing countries. 展开更多
关键词 mixed traffic flow bus stop road capacity speed bicycles
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茶树STOP基因家族的鉴定及表达模式分析 认领 引用 被引量：2
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作者 龙露 汤丹丹 +3 位作者 陈玮 谭礼强 陈盛相 唐茜 《茶叶科学》 CAS CSCD 北大核心 2024年第3期386-398,共13页
STOP(Sensitive to proton rhizotoxicity)是一类C2H2型锌指结构转录因子,在植物多种胁迫耐受机制中发挥重要调控作用。基于茶树(Camellia sinensis)全基因组数据共鉴定出6个STOP家族基因,并运用生物信息学和实时荧光定量PCR(qRT-... STOP(Sensitive to proton rhizotoxicity)是一类C2H2型锌指结构转录因子,在植物多种胁迫耐受机制中发挥重要调控作用。基于茶树(Camellia sinensis)全基因组数据共鉴定出6个STOP家族基因,并运用生物信息学和实时荧光定量PCR(qRT-PCR)等方法对其进行分析。结果表明,6个CsSTOPs基因编码376~505个氨基酸,蛋白质分子量为42.17~56.36 kDa,理论等电点为5.53~8.85,均为不稳定蛋白;蛋白质保守结构域分析发现,它们均含zf-C2H2保守结构域;系统进化分析显示,茶树的STOP基因与拟南芥、甜橙、烟草的同源性较高;启动子顺式作用元件分析发现,CsSTOPs具有许多与生长发育、激素响应及非生物胁迫相关的作用元件;茶树各器官的转录组数据分析结果表明,CsSTOP1在根、果实、成熟叶片中的表达量较高,CsSTOP2在幼嫩叶片中的表达量较高,CsSTOP3在老叶中的表达量较高,而Cs STOP4和Cs STOP5在各个器官中的表达都较低。CsSTOPs基因能够被PEG诱导的干旱胁迫、盐胁迫、茉莉酸甲酯胁迫和冷胁迫处理诱导表达,说明CsSTOPs基因参与调控茶树生长发育和响应非生物胁迫过程。qRT-PCR检测发现,CsSTOPs、CsGS1s和CsGDHs基因在高NH4+浓度处理(4.5 mmol·L-1)的峨眉问春茶树叶和根中的表达量均高于对照处理(CK),尤其是叶中CsSTOPs、CsGS1.1、CsGS1.3和CsGDH2在高NH4+浓度处理下的表达量显著高于对照。研究结果初步解析了CsSTOPs的基本特征和功能,发现CsSTOPs可响应高NH4+浓度处理,可能与CsGS1s和CsGDHs协同调控茶树适应高NH4+环境的过程。 展开更多
关键词 茶树 STOP基因家族 生物信息学分析 基因表达
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基于杜邦STOP系统的安全员安全管理模式探讨 认领 引用 被引量：16
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作者 乐增 江楠 《安全与环境工程》 CAS 北大核心 2013年第4期127-130,共4页
为了提高企业安全管理工作的有效性,提升企业安全业绩,本文结合杜邦STOP系统,从安全员的定位、职能、工作重点等几个方面探讨了改进我国企业安全员传统安全管理模式的途径,并强调指出安全员要遵循安全管理的客观规律,注重在企业安全管... 为了提高企业安全管理工作的有效性,提升企业安全业绩,本文结合杜邦STOP系统,从安全员的定位、职能、工作重点等几个方面探讨了改进我国企业安全员传统安全管理模式的途径,并强调指出安全员要遵循安全管理的客观规律,注重在企业安全管理工作中的正确定位与职能转变,减少安全管理过程中与员工的矛盾点,把安全工作的重点放在人身上等。通过安全员安全管理模式的改进,可以降低安全管理工作的人力资本,充分发挥安全员安全管理工作的效用,以创建优秀的企业安全文化。 展开更多
关键词 杜邦STOP系统 安全员 安全管理模式
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Development of an electronic stopping power model based on deep learning and its application in ion range prediction 认领 引用 被引量：2
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作者 Xun Guo Hao Wang +3 位作者 Changkai Li Shijun Zhao Ke Jin Jianming Xue 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第7期255-261,共7页
Deep learning algorithm emerges as a new method to take the raw features from large dataset and mine their deep implicit relations,which is promising for solving traditional physical challenges.A particularly intricat... Deep learning algorithm emerges as a new method to take the raw features from large dataset and mine their deep implicit relations,which is promising for solving traditional physical challenges.A particularly intricate and difficult challenge is the energy loss mechanism of energetic ions in solid,where accurate prediction of stopping power is a longtime problem.In this work,we develop a deep-learning-based stopping power model with high overall accuracy,and overcome the long-standing deficiency of the existing classical models by improving the predictive accuracy of stopping power for ultra-heavy ion with low energy,and the corresponding projected range.This electronic stopping power model,based on deep learning algorithm,could be hopefully applied for the study of ion-solid interaction mechanism and enormous relevant applications. 展开更多
关键词 electronic stopping power deep learning ion range reciprocity theory
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应用于汽车发动机start/stop模式的磁流变悬置设计与分析 认领 引用 被引量：2
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作者 邓召学 杨青桦 +1 位作者 蔡强 刘天琴 《重庆大学学报》 CAS CSCD 北大核心 2021年第2期1-12,共12页
针对汽车在start/stop模式下发动机传递至车身的振动和扭矩过大问题,设计了一种具有惯性通道的流动模式磁流变悬置。在考虑了激励电流对磁流变液黏度的影响规律和悬置液阻效应的基础上,建立悬置的阻尼力数学模型。采用有限元软件分析了... 针对汽车在start/stop模式下发动机传递至车身的振动和扭矩过大问题,设计了一种具有惯性通道的流动模式磁流变悬置。在考虑了激励电流对磁流变液黏度的影响规律和悬置液阻效应的基础上,建立悬置的阻尼力数学模型。采用有限元软件分析了在励磁线圈作用下磁流变悬置磁路阻尼通道处的磁感应强度分布规律,分析了激励电流和磁路的结构参数对悬置恢复力和可控力的影响规律。并对磁流变悬置进行了性能测试和start/stop模式下的实车试验。结果表明,所设计的磁流变悬置具有良好的可控性,并且能有效地隔离汽车发动机在start/stop模式下的振动传递。 展开更多
关键词 磁流变悬置 汽车发动机start/stop模式 隔振
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STOP1介导多种逆境响应分子机制的研究进展 认领 引用 被引量：2
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作者 马哲宇 高可可 +2 位作者 李桂新 丁忠杰 郑绍建 《植物生理学报》 CAS CSCD 北大核心 2023年第4期773-781,共9页
STOP1 (sensitive to proton rhizotoxicity 1)是一个在植物多种胁迫耐受机制中发挥重要调控作用的转录因子。酸性土壤条件下,STOP1能调控植物根系对质子和铝毒害的耐受性。在营养逆境下,STOP1参与调控植物根系对土壤磷和氮的利用效率... STOP1 (sensitive to proton rhizotoxicity 1)是一个在植物多种胁迫耐受机制中发挥重要调控作用的转录因子。酸性土壤条件下,STOP1能调控植物根系对质子和铝毒害的耐受性。在营养逆境下,STOP1参与调控植物根系对土壤磷和氮的利用效率。在土壤盐碱条件下,STOP1能赋予根系耐盐性;然而在水分胁迫下,STOP1则会抑制植物耐旱性。此外,STOP1通过调控地上部生理响应促进植物对缺氧胁迫的耐受能力。因此,探究STOP1调控不同胁迫下植物性状的分子机制,对于提高作物同时抗多种逆境能力具有重要意义。 展开更多
关键词 STOP1 转录因子 胁迫 酸铝毒害 营养 盐胁迫 干旱 低氧
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