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Search Results: 1 - 10 of 76926 matches for " 钱啸军 "
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快速冷却与隧道冷却——丹麦gram公司1982年2月第29号生产情报

食品科学 , 1983,
Abstract: ?一,快速冷却对一座屠宰场操作经营的经济效益具有实质性影响的一个因素,就是要尽可能降低在冷却过程中,由于水分蒸发而造成的重量损失。决定这一因素的关键是在肉类的冷却和冷藏过程中所采用的吸热方式。在屠宰场采用机械冷却之前,为了保持白条肉的新鲜度,将其挂在回笼间内,依靠白条肉的水分蒸
门静脉栓塞的MSCT诊断价值
,,汪玲玲
- , 2015, DOI: 10.13609/j.cnki.1000-0313.2015.02.015
Abstract: 【摘要】目的:探讨门静脉栓塞的MSCT诊断价值。方法:回顾性分析29例经临床/手术病理证实的门静脉栓塞患者的MSCT表现和临床资料,29例中门静脉血栓(PVT)13例(PVT组),门静脉瘤栓(PTT)16例(PTT组)。结果:29例栓子的部位、范围均清晰显示;13 例PVT中9 例继发于肝硬化门静脉高压;CT平扫呈等或稍高密度,动态增强呈不同形态、无强化的低密度充盈缺损;7例呈典型的“靶征”,5例呈“线样征”。16例PTT均继发于肝癌;CT平扫表现为等或稍低密度,动态增强呈形态各异、不均匀强化的充盈缺损;PVT组与PTT组间CT强化差异具有统计学意义(P=0.000);PVT组完全阻塞3 例(3/13),PTT组12 例(12/16),PTT组完全阻塞率高于PVT组(P=0.040);PVT组管腔局部扩张2 例(2/13),PTT组12例(12/16),PTT组管腔局部扩张高于PVT组(P=0.030);PVT组管壁局部不光整1例(1/13),PTT组14例(14/16),PTT组管壁局部不光整率高于PVT组(P=0.000)。结论:MSCT能显示门静脉栓塞的影像特征,准确判断栓子的部位、范围及性质,对该病的诊断具有重要价值
起落架钢的发展

材料工程 , 1992,
Abstract: 尽管未来飞机中金属总重量将明显减少,但可以预料钢的比例不会下降很多。普遍认为,大应力区和重载荷部位将继续依赖航空航天特种钢。从成本-效率角度分析,对于许多起关键作用的部件(如起落架构件、操纵面传动装置以及发动机齿轮传动装置和传动轴)来说,钢继续是唯一的首选材料。
企业竞争情报分析方法的层次框架

图书情报工作 , 2006,
Abstract: ?简要回顾竞争情报分析方法框架模型的研究现状,根据企业环境的层次、要素、战略分析理论及竞争战略理论,总结37种分析方法的谱系关系,提出5个层次模型。分析各层分析方法的功能和作用,揭示各种分析方法之间的边界与关联性,并按照框架理论总结5个层次之间的“旋转”关系,藉以提高企业竞争情报人员及决策者有序有效地选择、利用各种分析方法的能力。
混合动力电动汽车系统多态故障树的自动建造
,严运兵,
公路交通科技 , 2012,
Abstract: 提出了在系统部件和结构模型规范化描述的基础上,对含有分流和汇流结构的负反馈系统故障树自动建造的处理方法。采用此方法,可利用规范化和标准化的元部件模型库,通过拖拽的方式形成系统功能图(即得到系统结构模型),在此基础上,可按任意指定的顶事件状态,实时的自动生成故障树。该方法在混合动力电动汽车系统中的应用,为发现系统可靠性设计的缺陷、进行故障的实时监测诊断和进行控制率的实时切换提供了依据;提供了混合动力电动汽车系统多态故障树自动建造的实例结果,冗余支路少、符合逻辑、结果正确,证明了该方法的正确性;具有通用性,也可用于其他大型复杂系统故障树的自动建造。
暗条模型中暗条电流纵向分量的考虑
李可,
空间科学学报 , 1998,
Abstract: 用暗条电流模型中矩形电流回路来研究NOAA131活动区暗条,结果得到暗条上升时弯曲成"U"形态,跟观测结果不符.因此本文推知:考虑暗条电流的纵向分量时一种椭圆形回路似乎比矩形回路更接近于暗条实际.
二维矩阵卷积的并行计算方法
,郭阳,
- , 2018, DOI: 10.3785/j.issn.1008-973X.2018.03.013
Abstract: 为了提高卷积神经网络模型中二维矩阵卷积的计算效率,基于FT2000多核向量处理器研究二维矩阵卷积的并行实现方法.通过使用广播指令将卷积核元素广播至向量寄存器,使用向量LOAD指令加载卷积矩阵行元素,并通过混洗操作将不易并行化的矩阵卷积操作变成可以向量化的乘加操作,实现了通过减少访存、充分复用已取数据的方式来提高算法的执行效率.设计卷积矩阵规模变化、卷积核规模不变和卷积矩阵规模不变、卷积核规模变化2种常用矩阵卷积计算方式,并对比分析不同计算方式对算法执行效率的影响.基于服务器级多核CPU和TI6678进行实验对比,实验结果显示,FT2000比多核CPU及TI6678具有更好的计算优势,相比多核CPU最高可加速11 974倍,相比TI6678可加速21倍.
Abstract: A parallel implementation method based on multi-core vector processor FT2000 was proposed to improve the computational efficiency of two-dimensional matrix convolution in convolution neural network model. The convolution kernel element was broadcast to vector register by using broadcast instruction; the row elements of the convolution matrix were vector loaded. With shuffle operation,the operation of matrix convolution, which is hard to be parallelled, can be vectorized by using multiply-add operation, and the implementation efficiency was achieved through reduction of access, full reuse of obtained data. Two kinds of common matrix convolution methods were designed:changing convolution matrix scale with constant convolution kernel size, and constant convolution matrix size with changing convolution kernel scale. The influence of different calculation methods on the algorithm execution efficiency was analyzed and compared. Finally, the comparison experiments were taken based on the server-level multi-core CPU and TI6678. Results show that FT2000 has a better computing advantage over multi-core CPU and TI6678, which can accelerate up to 11 974 times compared to multi-core CPU, while to TI6678 it is 21 times.
森林防火开沟犁的设计及性能分析
,茹煜,汪东,丛静华
- , 2016, DOI: 10.13360/j.issn.2096-1359.2016.04.020
Abstract: 为防止山火蔓延、保护森林资源,在林区开设防火线是主要措施之一。但由于比较成熟的、专门用于开设防火线的开沟设备非常少,一般直接采用农用开沟设备进行作业,其开沟效率不高且杂草覆盖效果不好。基于多功能森林消防车,笔者设计了一款能与其相配套使用的三悬架型式的森林防火开沟犁,犁体曲面设计成三片曲率不同的曲面,以适应复杂土质环境,获得良好翻土性能。运用ANSYS软件对开沟犁的静力学、动力学及动力消耗进行了分析。结果表明,最大总体变形0.32 mm发生在犁铧刃口末端; 最大应变0.000 2 mm、最大应力34.74 MPa发生在犁柱与犁片焊接最上端。犁体完全入土后土壤平均反力为7.89 kN; 开沟犁整机所消耗的平均功率为23.67 kW。通过进行开沟犁的牵引阻力试验,获得单个犁体牵引阻力为6.9 kN,试验值与仿真值基本相符。
Building and maintaining fireline is one of the main measures to prevent the spread of fires and protect the forest resources. But because of the limited professional and mature fireline construction equipment suited for the rugged needs of the forest industry, the agricultural ploughs are always adopted, which have the disadvantage of low efficiency of trenching and low weed coverage. Based on multifunctional forest firefighting vehicle, this paper designed a forest fireline plow with three suspension structure and specially designed three different curvature of plow surface in order to adapt to the complex soil environment and achieve good performance in the turning over of the soil. The upper suspension is fixed with firefighting truck while the middle suspension and the below suspension are connected by two springs. In this way, when the blade touched solid objects, the supporting spring can achieve vibration-suppressing effect. The plow furrow opener blade was optimized in two conical surface, hyperboloid of one sheet and oblique spiral surface respectively. The statics, dynamics, and power consumption analysis of fireline plow as well as the model of fireline plow cutting soil were analyzed by ANSYS software. The soil characteristics were also analyzed in aspects of the composition of soil, constitutive theory, and the soil model MAT147(MAT_FHWA_SOIL). From the result of dynamic simulation analysis we can get the effect of cutting soil, three stress nephogram, and the force of soil reaction during cutting process respectively. The results showed that the maximum total deformation which occurred at the end of the plough share edge is 0.32 mm. Maximum strain with 0.000 2 mm and maximum stress with 34.74 MPa which occurred in the welding upper between plow pole. The average counter force is 7.89 kN when plow body is completely buried in soil and the average power consumption of fireline plow is 23.67 kW. Single plow traction resistance is 6.9 kN by the fireline plow traction resistance test. The simulation results are basically agreed with the test value
以降损和载荷均衡为目标的地区电网网络重构快速算法
汲国强,吴文传,张伯明,孙宏斌,,
电网技术 , 2012,
Abstract: 电网的网络重构本质上是一个以均衡支路载荷和降低网损为目的的多目标优化问题,其是地区电网实现节能调度的重要手段。为了在优化中同时考虑经济性和安全性2类目标,建立了考虑网损和载荷均衡的综合模型,推导了开、合环引起的降损和载荷均衡指标的变化量估算公式。设计了基于该估算公式的网络重构支路交换法,可应用于综合考虑降低网损和支路载荷均衡为目的的网络重构。该算法已初步应    用于某地区电网,证明了该方法的有效性。  
双锥体重介质旋流器研发与应用

煤炭工程 , 2013, DOI: 10.11799/ce201310041
Abstract: 本文应用计算流体力学技术对双锥体无压给料三产品重介质旋流器的流场进行了比较分析研究,并通过了实际生产应用检验。结果表明,现场应用效果完全达到预期效果。
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