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筛选适合酸中毒小鼠骨骼肌组织蛋白提取的裂解液 预览
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作者 罗旭光 藏好晶 +1 位作者 孙鹏 曹锡梅 《中国组织工程研究》 CAS 北大核心 2019年第14期2228-2234,共7页
背景:RIPA Buffer对不同组织细胞总蛋白的提取效率有差异,并不通适于所有的组织样本。目的:筛选适合酸中毒小鼠骨骼肌组织蛋白提取的裂解液,为研究骨骼肌萎缩奠定基础。方法:3月龄健康雄性C57BL/6小鼠20只,体质量25-30g,由山西医科大学... 背景:RIPA Buffer对不同组织细胞总蛋白的提取效率有差异,并不通适于所有的组织样本。目的:筛选适合酸中毒小鼠骨骼肌组织蛋白提取的裂解液,为研究骨骼肌萎缩奠定基础。方法:3月龄健康雄性C57BL/6小鼠20只,体质量25-30g,由山西医科大学实验动物中心提供。麻醉后脱臼处死小鼠,分离获取下肢腓肠肌。实验分为2组:HCl诱导酸中毒组每日定时供给10g混合10mL0.4mol/LHCl的饲料;对照组饲料中混合同等量的H2O,连续7d。比较RIPA Buffer、Original Buffer和JP Buffer对酸中毒小鼠骨骼肌组织蛋白的提取效果;蛋白免疫印迹实验检测AKT、p-AKT(Thr308)、rpS6和p-rpS6(Ser235/236)的表达;RT-qPCR定量分析GLUT4的表达。结果与结论:①3种裂解液对骨骼肌组织蛋白的提取能力有差异,JPBuffer提取蛋白产量高,但是目的蛋白信号并不强;RIPABuffer提取蛋白产量相对偏低;Original Buffer提取足量骨骼肌组织蛋白,蛋白免疫印迹显示目的蛋白条带清晰;②蛋白免疫印迹实验评分显示,Original Buffer总分高于其他2种裂解液;③蛋白免疫印迹实验结果显示,酸中毒组和对照组AKT、rpS6磷酸化程度均无变化;④RT-qPCR定量分析显示,酸中毒组和对照组RNA水平GLUT4表达无变化;⑤结果提示,OriginalBuffer是提取骨骼肌组织蛋白的最佳裂解液;短期HCl诱导酸中毒组AKT信号通路未激活,延长酸中毒时间是否会激活该信号通路值得研究。针对不同实验样本选择合适的裂解液是保证蛋白免疫印迹实验结果可信度的前提。 展开更多
关键词 裂解液 SDS RIPA BUFFER ORIGINAL BUFFER JP BUFFER Western blot RT-QPCR 骨骼肌 小鼠 酸中毒 印迹法 蛋白质 骨骼 组织工程
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Extending SSD Lifespan with Comprehensive Non-Volatile Memory-Based Write Buffers
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作者 Ziqi Fan Dongchul Park 《计算机科学技术学报:英文版》 SCIE EI CSCD 2019年第1期113-132,共20页
New non-volatile memory (NVM)technologies are expected to replace main memory DRAM (dynamic random access memory)in the near future.NAND flash technological breakthroughs have enabled wide adoption of solid state driv... New non-volatile memory (NVM)technologies are expected to replace main memory DRAM (dynamic random access memory)in the near future.NAND flash technological breakthroughs have enabled wide adoption of solid state drives (SSDs)in storage systems.However,flash-based SSDs,by nature,cannot avoid low endurance problems because each cell only allows a limited number of erasures.This can give rise to critical SSD reliability issues.Since many SSD write operations eventually cause many SSD erase operations,reducing SSD write traffic plays a crucial role in SSD reliability. This paper proposes two NVM-based buffer cache policies which can work together in different layers to maximally reduce SSD write traffic:a main memory buffer cache design named Hierarchical Adaptive Replacement Cache (H-ARC)and an internal SSD write buffer design named Write Traffic Reduction Buffer (WRB).H-ARC considers four factors (dirty,clean, recency,and frequency)to reduce write traffic and improve cache hit ratios in the host.WRB reduces block erasures and write traffic further inside an SSD by effectively exploiting temporal and spatial localities.These two comprehensive schemes significantly reduce total SSD write traffic at each different layer (i.e.,host and SSD)by up to 3x.Consequently,they help extend SSD lifespan without system performance degradation. 展开更多
关键词 BUFFER cache policy WRITE BUFFER non-volatile MEMORY solid state drive flash MEMORY
电梯线性蓄能型缓冲器型式试验中最大缓冲行程的讨论 预览
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作者 钱嘉俊 《上海电气技术》 2019年第2期50-53,共4页
在进行电梯线性蓄能型缓冲器型式试验时,型式试验证书配置表中的最大缓冲行程参数尚无明确定义。通用的做法是将实测的弹簧压缩量作为最大缓冲行程参数进行限定,但根据TSG T7007-2016标准,在一致性核查环节可能出现问题。基于电梯线性... 在进行电梯线性蓄能型缓冲器型式试验时,型式试验证书配置表中的最大缓冲行程参数尚无明确定义。通用的做法是将实测的弹簧压缩量作为最大缓冲行程参数进行限定,但根据TSG T7007-2016标准,在一致性核查环节可能出现问题。基于电梯线性蓄能型缓冲器的实际性能要求和制造工艺,对型式试验中的最大缓冲行程进行了讨论,对缓冲器压缩量与适用质量范围的关系进行了分析,并提出了型式试验证书配置表中最大缓冲行程参数的合理解释和对应做法。 展开更多
关键词 电梯 缓冲器 型式试验 缓冲行程
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基于CCPM-MPL表达方法的缓冲区设置方法 预览
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作者 郝可可 《价值工程》 2019年第8期3-6,共4页
由极大-加线性(Max-plus Linear, MPL)表达和关键链项目管理(Critical Chain Project Management, CCPM)结合而成的关键链项目管理-极大-加线性(CCPM-MPL)表达方法兼备了两种工具的优势,逐渐应用于施工项目管理中。但是当前CCPM-MPL表... 由极大-加线性(Max-plus Linear, MPL)表达和关键链项目管理(Critical Chain Project Management, CCPM)结合而成的关键链项目管理-极大-加线性(CCPM-MPL)表达方法兼备了两种工具的优势,逐渐应用于施工项目管理中。但是当前CCPM-MPL表达方法仅使用缺乏数理依据的剪切法计算缓冲区,缓冲区尺寸偏大。本文在描述Max-plus代数的基础上,为计算结果更为合理的缓冲区计算方法———根方差法设计 Max-plus 代数表达式,丰富了 CCPM-MPL表达方法的研究内容。 展开更多
关键词 缓冲区 关键链项目管理-极大-加线性表达方法 关键链项目管理 极大-加线性代数
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Improving Extraction method. determining NO^-2-N. Acidic Soil 预览
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作者 Nan Xu 《探索-土壤科学》 2019年第1期23-27,共5页
Nitrite (No-2-N) A key intermediate. both nitrification, denitrification which. also closely related.Emission. kg gas from soil. since its Rapid Reaction. soil, instability. acidic condition a large number. decomposit... Nitrite (No-2-N) A key intermediate. both nitrification, denitrification which. also closely related.Emission. kg gas from soil. since its Rapid Reaction. soil, instability. acidic condition a large number. decomposition will occur. extraction process using 2 mol/L KCl.. order. enhance. accuracy. study. NO-2-N changes. acidic soil a more appropriate extraction method should be investigated. improve. effeciency. nitrite extraction.. study we put forward some suggestions. improving NO-2-N extraction based our resutls. NO-2-N recovery measured by using15N-labelling method.-2.-N and NH4.-N in Alibaba socks. Within 30 min breaking, the recovery of no-2.-N was highest in the adjusted pH 6.0 and pH 8.0 treatments, while the recovery of ammo was highest in the unadjusted and adjusted pH 6.0 treatments. in addition, even after breaking, the pH of extraction solution in the adjusted pH 6.0 and pH 8.0 treatments were maintaken at about 4.8 and 5.8, which were significant higher than that of control (3.8 ). in all, the pH of extraction solution should be adjusted to 5.0-6.0 and aging time should be 30 min to get a more efficient extraction of both no-2.-N and NH4.-N. For strong acidic soils (pH <6.0), a mixture of KCl and pH 8.4 buffer (KCl︰Buffer = 4︰1) should be used as extraction solution (the ratio. soil. extraction solution. 1︰5).. alkaline soils (pH≥7.5) A mixture. KCL, pH 7.5 buffer (KCl︰Buffer = 4︰1) should be used as extraction solution (the ratio. soil. extraction solution. 1︰5).. soil samples Ph ~ 6.0. 7.5 It can be extracted directly by 2 mol/L KCl solution. 展开更多
关键词 NITRITE RECOVERY pH BUFFER ACIDIC soil
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pH-Responsive and Buffering Macromolecule Aqueous Absorbent and Mathematic Model-Based Feasibility Evaluation for SO2 Capture 预览
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作者 Wei Feng Wenhao Gu +4 位作者 Lühong Zhang Xiaowei Tantai Bin Jiang Huawei Yang Hongjie Zhang 《天津大学学报:英文版》 EI CAS 2019年第3期226-236,共11页
An organic macromolecule,poly(1-vinylimidazole),with an appropriate polymerization degree was proposed and mixed with water to form a novel aqueous absorbent for SO2 capture.This aqueous solution absorbent has the adv... An organic macromolecule,poly(1-vinylimidazole),with an appropriate polymerization degree was proposed and mixed with water to form a novel aqueous absorbent for SO2 capture.This aqueous solution absorbent has the advantages of simple preparation,good physicochemical properties,environment-friendliness,high ability in deep removal of SO2,and excellent reusability.Moreover,pH-responsive behavior,pH buffering absorption mechanism,and their synergistic effect on absorption performance were revealed.The solubilities of SO2 in the absorbent were measured in detail,and the results demonstrated excellent absorption capacity and recyclability.Then,mathematic models that describe SO2 absorption equilibrium were established,and the corresponding parameters were estimated.More importantly,on the basis of model and experimental data,the absorption and desorption could maintain high efficiency within a wide operating region.In summary,this work provided a low-cost,efficient,and unique absorbent for SO2 capture and verified its technical feasibility in industrial application. 展开更多
关键词 Poly(1-vinylimidazole) PH buffer PH responsibility SO2 CAPTURE Flue gas desulfurization
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多杆式可调节索道测速缓冲装置设计 预览
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作者 李村 里鑫 +2 位作者 李刚 刘佳 张洋 《起重运输机械》 2019年第8期65-67,共3页
现有索道轮体测速装置采用齿轮啮合传递转速给测速仪器实现测量,其测量精度容易受线路载荷、电机运行状态以及轮体尺寸和加工精度等多方面因素影响,而且测速装置结构形式单一,不具备通用性,缓冲减振效果不佳。研究设计一种多杆式可调节... 现有索道轮体测速装置采用齿轮啮合传递转速给测速仪器实现测量,其测量精度容易受线路载荷、电机运行状态以及轮体尺寸和加工精度等多方面因素影响,而且测速装置结构形式单一,不具备通用性,缓冲减振效果不佳。研究设计一种多杆式可调节缓冲测速装置,通过工业气弹簧和滑动支座的组合运动,实现测速仪器0~31°角度可调,从而适应不同工况安装需求,同时工业气弹簧实现主动调节和缓冲减振,消除了测速过程中的冲击,提高了测量精准性。 展开更多
关键词 索道 多杆式 可调节 测速 缓冲
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数字递变异变赝衬底上2.6μm In0.83Ga0.17As/InP光电探测器的性能改进 预览
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作者 师艳辉 杨楠楠 +4 位作者 马英杰 顾溢 陈星佑 龚谦 张永刚 《红外与毫米波学报》 SCIE EI CAS CSCD 北大核心 2019年第3期275-280,共6页
研究了In0. 83Al0. 17As /In0. 52Al0. 48As 数字递变异变缓冲层结构( DGMB)的总周期数对2. 6 μm 延伸波长In0. 83Ga0. 17As 光电二极管性能的影响.实验表明,在保持总缓冲层厚度不变的情况下,通过将在InP 衬底上生长的In0. 83Al0. 17As... 研究了In0. 83Al0. 17As /In0. 52Al0. 48As 数字递变异变缓冲层结构( DGMB)的总周期数对2. 6 μm 延伸波长In0. 83Ga0. 17As 光电二极管性能的影响.实验表明,在保持总缓冲层厚度不变的情况下,通过将在InP 衬底上生长的In0. 83Al0. 17As /In0. 52Al0. 48As DGMB 结构的总周期数从19 增加到38,其上所生长的In0. 83 Ga0. 17 As /In0. 83Al0. 17As 光电二极管材料层的晶体质量得到了显著改善.对于在总周期数为38 的DGMB 上外延的In0. 83Ga0. 17As 光电二极管,观察到其应变弛豫度增加到99. 8%,表面粗糙度降低,光致发光强度和光响应度均增强,同时暗电流水平被显著抑制.这些结果表明,随着总周期数目的增加,DGMB 可以更有效地抑制穿透位错的传递并降低残余缺陷密度. 展开更多
关键词 数字递变 异变 缓冲 INGAAS 光电探测器
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疏水硅胶颗粒吸能机理的试验研究 预览
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作者 周迟 李晓莉 王明德 《大理大学学报》 CAS 2019年第6期27-31,共5页
疏水硅胶是一种由水和布满微孔的疏水硅胶颗粒组成的缓冲介质,将疏水硅胶密封在可压缩的液压缸内即可形成疏水硅胶缓冲器。在冲击过程中利用水分子侵入和逸出疏水微孔,可以实现能量的存储、转化和消耗。基于Laplace-Washburn方程和接触... 疏水硅胶是一种由水和布满微孔的疏水硅胶颗粒组成的缓冲介质,将疏水硅胶密封在可压缩的液压缸内即可形成疏水硅胶缓冲器。在冲击过程中利用水分子侵入和逸出疏水微孔,可以实现能量的存储、转化和消耗。基于Laplace-Washburn方程和接触角迟滞模型,研究水分子侵入和逸出微孔的过程;采用准静态试验验证力学模型,并根据试验曲线计算疏水硅胶的耗能效率。结果表明:疏水硅胶在工作过程中呈现较大的迟滞现象环,是一种理想的吸能材料。 展开更多
关键词 疏水硅胶 迟滞 缓冲
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电梯对重系统安全部件的选型设计
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作者 翟磊 《中国电梯》 2019年第5期17-19,36共4页
当电梯对重安装安全钳时,标准要求对重限速器动作速度应大于轿厢安全钳动作的速度,这就对对重安全部件的设计选型提出了特别的要求。本文就相关问题在标准基础上进行论证演算,从而推导出限速器动作速度选择、瞬时安全钳和对重缓冲器选... 当电梯对重安装安全钳时,标准要求对重限速器动作速度应大于轿厢安全钳动作的速度,这就对对重安全部件的设计选型提出了特别的要求。本文就相关问题在标准基础上进行论证演算,从而推导出限速器动作速度选择、瞬时安全钳和对重缓冲器选型设计方案并例证,为合理、安全、经济的使用对重安全部件提供了参照。 展开更多
关键词 电梯 对重 限速器 安全钳 缓冲器 选型
CINRAD/SA型天气雷达天线座设计 预览
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作者 师民祥 杨晋蓉 《河北省科学院学报》 CAS 2019年第1期30-36,41共8页
本文所述的是新一代8.5m天气雷达的天线座结构设计,它以成功的盘轴承设计、减速器设计以及同步装置、滑环的设计、缓冲装置设计以及完善地维护性设计有效地解决了天线座运行可靠性与寿命问题、天线座刚度以及维护设置等问题。
关键词 盘轴承 减速器 同步装置 滑环 缓冲装置 维护性
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Analysis of Fluid Model Modulated by an M/PH/1 Working Vacation Queue
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作者 Xiuli Xu Huining Wang 《系统科学与系统工程学报:英文版》 SCIE EI CSCD 2019年第2期132-140,共9页
We propose a fluid model driven by the queue length process of a working vacation queue with PH service distribution, which can be applied to the Ad Hoc network with every data group. We obtain the stationary distribu... We propose a fluid model driven by the queue length process of a working vacation queue with PH service distribution, which can be applied to the Ad Hoc network with every data group. We obtain the stationary distribution of the queue length in driving process based on a quasi-birth-and-death process. Then, we analyze the fluid model, and derive the differential equations satisfied by the stationary joint distribution of the fluid queue based on the balance equation. Moreover, we obtain some performance indices, such as, the average throughput, server utilization and the mean buffer content. These indices are relevant to pack transmission in the network, and they can be obtained by using the Laplace Transform (LT) and the Laplace-Stieltjes Transform (LST). Finally, some numerical examples have been discussed with respect to the effect of several parameters on the system performance indices. 展开更多
关键词 Fluid model M/PH/1 QUEUE average THROUGHPUT server utilization buffer content Ad HOC network
考虑待机能耗的串行生产线模糊控制优化研究 预览
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作者 王磊 林文文 屠建飞 《宁波大学学报:理工版》 CAS 2019年第2期23-29,共7页
为了减少串行生产线上机器在饥饿或堵塞状态下的待机耗能,提出了对机器进行模糊控制启、停的节能方法.在不影响生产线产量的前提下,模糊控制器利用被控制机器上、下游缓存区的实时容量数据,确定该机器的最大节能停机时长,并通过遗传算法... 为了减少串行生产线上机器在饥饿或堵塞状态下的待机耗能,提出了对机器进行模糊控制启、停的节能方法.在不影响生产线产量的前提下,模糊控制器利用被控制机器上、下游缓存区的实时容量数据,确定该机器的最大节能停机时长,并通过遗传算法,以最大停机节能时长为目标函数,对模糊控制器的隶属函数进行优化,提高了模糊控制器的节能性能.仿真模型试验结果表明,相对于原始生产线,在运用经过优化的模糊控制器的串行生产线上,待机能耗降低达27.35%,并且生产线产量未受影响. 展开更多
关键词 串行生产线 缓存区 节能方法 模糊控制 遗传算法
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Effects of growth temperature and metamorphic buffer on electron mobility of InAs film grown on Si substrate by molecular beam epitaxy
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作者 张静 吕红亮 +5 位作者 倪海桥 杨施政 崔晓然 牛智川 张义门 张玉明 《中国物理B:英文版》 SCIE EI CAS CSCD 2019年第2期428-433,共6页
The growth of the InAs film directly on the Si substrate deflected from the plane(100) at 4° towards(110) has been performed using a two-step procedure. The effect of the growth and annealing temperature on the e... The growth of the InAs film directly on the Si substrate deflected from the plane(100) at 4° towards(110) has been performed using a two-step procedure. The effect of the growth and annealing temperature on the electron mobility and surface topography has been investigated for a set of samples. The results show that the highest electron mobility is4640 cm~2/V·s in the sample, in which the 10-nm InAs nucleation layer is grown at a low temperature of 320 ℃ followed by ramping up to 560 ℃, and the nucleation layer was annealed for 15 min and the second layer of InAs is grown at 520 ℃.The influence of different buffer layers on the electron mobility of the samples has also been investigated, which shows that the highest electron mobility of 9222 cm~2/V·s at 300 K is obtained in the sample grown on a thick and linearly graded InGaAlAs metamorphic buffer layer deposited at 420 ℃. 展开更多
关键词 INAS Si high electron MOBILITY growth temperature INGAALAS METAMORPHIC BUFFER
Insight into band alignment of Zn(O,S)/CZTSe solar cell by simulation
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作者 姜振武 高守帅 +7 位作者 王思宇 王东潇 高鹏 孙强 周志强 刘玮 孙云 张毅 《中国物理B:英文版》 SCIE EI CAS CSCD 2019年第4期408-414,共7页
Cd-free kesterite structured solar cells are currently attracting attention because they are environmentally friendly. It is reported that Zn(O,S) can be used as a buffer layer in these solar cells. However, the band ... Cd-free kesterite structured solar cells are currently attracting attention because they are environmentally friendly. It is reported that Zn(O,S) can be used as a buffer layer in these solar cells. However, the band alignment is not clear and the carrier concentration of Zn(O,S) layer is low. In this study, the band alignment of the Zn(O,S)/Cu2 ZnSnSe4 p–n junction solar cell and the effect of In2 S3/Zn(O,S) double buffer layer are studied by numerically simulation with wxAMPS software.By optimizing the band gap structure between Zn(O,S) buffer layer and Cu2 ZnSnSe4 absorber layer and enhancing the carrier concentration of Zn(O,S) layer, the device efficiency can be improved greatly. The value of CBO is in a range of 0 eV–0.4 eV for S/(S + O)= 0.6–0.8 in Zn(O,S). The In2 S3 is mainly used to increase the carrier concentration when it is used as a buffer layer together with Zn(O,S). 展开更多
关键词 CZTSe BAND ALIGNMENT double BUFFER layer SIMULATION
Traffic dynamics considering packet loss in finite buffer networks
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作者 陈杰 陈金邕 +1 位作者 李明 胡茂彬 《中国物理B:英文版》 SCIE EI CAS CSCD 2019年第4期433-438,共6页
In real complex systems, the limited storage capacity of physical devices often results in the loss of data. We study the effect of buffer size on packet loss threshold in scale-free networks. A new order parameter is... In real complex systems, the limited storage capacity of physical devices often results in the loss of data. We study the effect of buffer size on packet loss threshold in scale-free networks. A new order parameter is proposed to characterize the packet loss threshold. Our results show that the packet loss threshold can be optimized with a relative small buffer size. Meanwhile, a large buffer size will increase the travel time. Furthermore, we propose a Buffered-Shortest-Path-First(BSPF) queuing strategy. Compared to the traditional First-In-First-Out(FIFO) strategy, BSPF can not only increase the packet loss threshold but can also significantly decrease the travel length and travel time in both identical and heterogeneous node capacity cases. Our study will help to improve the traffic performance in finite buffer networks. 展开更多
关键词 FINITE BUFFER NETWORKS LOSS THRESHOLD QUEUING strategy
大型玻璃基板料盒转台机构改造设计 预览
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作者 庞博 李庆亮 李海泉 《机械管理开发》 2019年第5期1-2,8共3页
为了解决生产线自动上料系统中玻璃料盒转台机构自动化程度低、操作不便等问题,对料盒转台机构进行了设计改造。改造包括去掉无用机构,添加压纸和离子风机构。新的玻璃料盒转台机构操作简单方便,提高了生产效率,满足了客户要求。
关键词 缓冲 夹具 静电
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A transition from a large open pit into a novel“macroblock variant”block caving geometry at Chuquicamata mine,Codelco Chile 预览
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作者 German Flores Alex Catalan 《岩石力学与岩土工程学报:英文版》 CSCD 2019年第3期549-561,共13页
With a history of more than 100 years, Chuquicamata has become one of the largest open pits in the world. Its current depth of 1100 m, length of 4500 m and width of 3000 m, resulting in haulage distances of over 11,00... With a history of more than 100 years, Chuquicamata has become one of the largest open pits in the world. Its current depth of 1100 m, length of 4500 m and width of 3000 m, resulting in haulage distances of over 11,000 m from pit bottom to the processing plant or waste dumps, with waste/ore ratio greater than 4 and much lower grades, are effectively determining its profitable limit by the end of this decade. Currently, there are over 4300 Mt of geological resources containing 0.7% of copper and 340 ppm (1 ppm = 1 g/t) of molybdenum below the final pit shell. The corresponding orebody geometry is 3000 m northsouth, 300-800 m eastwest and the drilling campaign suggested the existence of more than 900 m of mineable ore from the final pit bottom. This is in spite of the fact that the Chuquicamata orebody is still open at depth. The business case to continue with the mining of the Chuquicamata orebody is to change from the current large open pit to a novel macroblock variant block caving geometry. This requires a production rate of 140,000 t/d (50 Mt per annum), with a continuous material handling system to achieve the 7-year ramp-up to full production. The resolution of a number of known technical, operational and logistical challenges outside current industry practises which Chuquicamata will face over its projected 40-year mine life is therefore essential. These challenges include simultaneous operations of open pit and underground macroblocks and from the initial lift to the second lift, rapid ramp-up and optimum sequencing of the planned macroblocks, early dilution from the west fault and late dilution from potential slope failures, and the potential for major operational hazards. An equally important issue to be addressed is cultural given that the mining history in the northern region of Chile, which includes Chuquicamata, is predominantly open pit. This paper presents a synopsis of the main challenges that the Chuquicamata underground project will face in order to meet the objectives of its corresponding busin 展开更多
关键词 MACROBLOCK VARIANT Block CAVING CAVE propagation Early and late dilutions Intensive PRECONDITIONING Rib PILLAR West fault Ore buffer
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淫羊藿苷在不同条件下的降解动力学行为 预览
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作者 陶俊烨 丁选胜 +3 位作者 吴正红 丁雨寅 宋征宇 王勤 《中成药》 CAS CSCD 北大核心 2019年第8期1763-1767,共5页
目的考察淫羊藿苷在不同条件(pH、温度、缓冲液)下的降解动力学行为。方法 HPLC法测定淫羊藿苷含有量后,计算其在不同pH(1.0、3.0、4.5、6.0、6.8、8.0)、温度(4、25、37、60℃)、缓冲液(0.1、0.3、0.5 mol/L磷酸盐、柠檬酸盐、醋酸盐)... 目的考察淫羊藿苷在不同条件(pH、温度、缓冲液)下的降解动力学行为。方法 HPLC法测定淫羊藿苷含有量后,计算其在不同pH(1.0、3.0、4.5、6.0、6.8、8.0)、温度(4、25、37、60℃)、缓冲液(0.1、0.3、0.5 mol/L磷酸盐、柠檬酸盐、醋酸盐)下的降解动力学参数。结果淫羊藿苷降解符合一级动力学方程,在pH 6.8时降解速率最小,稳定性最强。其降解速率随着温度、磷酸盐浓度升高而增加,随着醋酸盐浓度升高而降低,在不同浓度柠檬酸盐缓冲液中无明显变化。结论淫羊藿苷降解与pH、温度、缓冲液有一定关系。 展开更多
关键词 淫羊藿苷 降解动力学行为 PH 温度 缓冲液 HPLC
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基于AMESim的固沙车插草液压回路动态特性分析 预览
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作者 赵增耀 朱阳 陈文斌 《专用汽车》 2019年第4期88-91,共4页
针对固沙车插草机构液压回路中,液压缸运动速度快,换向频率高,负载变化剧烈,系统冲击振动大的现象,分析了用蓄能器及差动回路组成的插草液压回路的工作原理和结构特点,建立了基于AMESim模型仿真的插草机构液压回路。研究了液压缸缓冲、... 针对固沙车插草机构液压回路中,液压缸运动速度快,换向频率高,负载变化剧烈,系统冲击振动大的现象,分析了用蓄能器及差动回路组成的插草液压回路的工作原理和结构特点,建立了基于AMESim模型仿真的插草机构液压回路。研究了液压缸缓冲、蓄能器容积及预充压力对插草机构液压缸动态特性的影响,为此类液压回路中相关液压元件选型设计及优化匹配提供了参考。 展开更多
关键词 缓冲 蓄能器 液压回路 动态特性 仿真
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