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Abstract: In this paper,we develop a lofting method for railway tunnel profile including straight way and curve way,analyse carefully the error resources of lofting,and move an amendment one by one,precision analysis to the amended lofting formula shows t
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文摘:提出了铁路隧道断面（包括直道、弯道和坡度）的放样扫描方法，详细分析了放样扫描的误差来源，并逐一给出了修正方案，对修正后的放样公式作了精度分析，放样精度达到了预定的要求。 |
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Abstract: In this paper,we established the artificial neural network of the fault diagnosis of rotary mechanism using simulated annealing algorithm.We trained the neural network with seven kinds of fault sample of rotary mechanism and apply the neural net
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文摘:用模拟退火算法建立了旋转机械故障诊断的人工神经网络模型,以幅值谱中七个频段上的幅值为网络的输入模式,对旋转机械常见的几种故障进行分类训练,并应用于待识别故障样本的识别计算,证明该方法在旋转机械故障诊断中是有效的。 |
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Abstract: In this paper,we have had finite-calculation to dynamic structure according to the muffler drawings and the relation parameters.As we have received a disc impedance muffler model set at the entrance of LGA fan by using the optimum design way bef
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文摘:针对由最优化设计方法获得的LGA风机进口安装的圆盘式阻性消声器模型，在未对消声器实物加工之前，根据消声器的图纸及有关数据进行了有限元动力计算，从而初步了解消声器的动态特性.为设计优良的消声器提供新的有效途径. |
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Abstract: In this paper,we propose an improved Lagrangian relaxation algorithm to solve job-shop scheduling problems.Besides the addition of augmented objective,we expand the search scope of near-optimal solutions and improve the computational efficiency
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文摘:针对车间调度问题，提出了一种改进的拉氏松弛算法.在增加辅助目标函数的基础上，通过对子问题的限制和搜索策略的改变，使拉氏算法的计算量减少，近优解的搜索能力有很大改善.本文还提出了一种基因优化算法，充分利用拉氏算法得到的多个近优解，进一步优化结果.仿真结果表明对车间调度问题得到了较好的结果.本方法也可用于其它有约束的规划问题. |
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Abstract: In this paperfor real marine underwater noise data by using synchronous acquisition of pointsinputs-output covariance matrix is obtained by filtering compensating delay and crosscorrelation.Then the contribution of inputs to output in network
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文摘:本文对多点同步测量方法记录的舰艇噪声数据,采取在时域上作滤波、时延补偿和互相关得到输入输出协方差矩阵,然后从输入输出协方差矩阵计算在网络意义和偏相干意义下输入对输出的贡献以及其它有用的量。 |
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Abstract: In this paper，a ray-optics analysis is performed to investigate the asymmetry of dual beam scanning field produced by a rotating polygon.Some basic equations of dual beam scan are derived，such as，the position vector for the incident point，the sc
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文摘:应用几何光学理论研究了多光束转镜扫描场的非对称性，导出多光束扫描入射点位置矢量、反射线标量表达式、观察面上的扫描轨迹方程，并研究了扫描远场的非对称性。 |
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Abstract: In this paper，the essential chemical composition on the spheroidized quality of small-sized ductile iron pipes have been investigated，and the degeneration of spheroidal graphite in ductile iron pipe was analyzed，under practical manufacturing con
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文摘:在实际生产的条件下，研究了小口径球墨铸铁管在球化后主要化学成分的分布和变化对铸态球化效果的影响，并对铸管存在的球化衰退进行了分析；根据试验结果，提出了对成分及工艺条件进一步的改进措施。 |
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Abstract: In this paper，the feature of structure and the principle of preparation of porous glass is reviewed，and the characteristics and prospect of porous glass as new packing mcdium of liquid chromatography is reviewed also.
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文摘:本文综述了一种新型载体材料多孔玻璃的结构特点和制备原理，及其作为液相色谱新填充介质的良好特性和应用前景。 |
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Abstract: In this study distributions of block compression force on the driving and driven pulleys were measured using a ting load-cell inserted between two blocks and a telementer system, under several constant speed ratios.
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文摘:本研究采用超小型测力仪插入两推块和遥测装置之间在几种固定速比下测量主动和从动带轮上推块压缩力分布。 |
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Abstract: In tokamak plasma radiation diagnostics,if the width of a detected plasma chord is comparable with the plasma minor radius,the plasma boundary may influence the line-integrated emissivity considerably and make it a weighted integral of the width
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文摘:在托卡马克辐射诊断中，当探测束线的极向宽度与等离子体小半径可以比较时，等离子体边界会显著影响线积分辐射率，使其成为宽度平均辐射率的带权重的线积分。 |
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Abstract: In ureide-transporting legumes，ureides(allantoin and allantoic acid) are major transportform of biological fixed nitrogen.The distribution， properties，structure and regulation of plant allantoinase were reviewed in detail.The advances in the rec
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文摘:全面综述植物酰脲降解代谢酶的研究现况，概述植物尿囊素酶的分布、性质、结构，以及调节控制，并简介植物尿囊酸酰胺水解酶和脲基乙醇酸酰胺水解酶的研究近况，同时指出待研究的方向。 |
