不同施钾水平对玉米干物质及产量的影响

生物产量是提高经济产量的基础,而施肥是调控生物产量及其组分动态转化的重要手段。本研究通过不同施钾水平对玉米干物质积累动态变化的影响分析,确定出钾肥合理用量,为玉米高产高效栽培提供理论依据。     

掺Yb相移光纤光栅形成过程的分析

研究了用二次曝光法制作掺Yb相移光纤光栅的实验过程 ,并对相移光纤光栅制作过程中出现次峰的情况进行了理论分析。合理地解释了该现象     

Hierarchical production control for a flow shop with dynamic setup changes and random machine breakdowns

In this paper, we study a manufacturing system consisting of two machines separated by two intermediate buffers, and capable of producing two different products. Each product requires a constant processing time on each of the machines. Each machine requires a constant non-negligible setup change time from one product to the other. The demand rate for each product is considered to be piecewise constant. Each machine undergoes failure and repair. The time-to-failure and time-to-repair are exponentially distributed random variables. The setup change and processing operations are resumable. We model our system as a continuous time, continuous flow process. An optimal control problem is formulated for the system to minimize the total expected discounted cost over an infinite horizon. To determine the optimal control policy structure, a discrete version of the problem is solved numerically using a dynamic programming formulation with a piecewise linear penalty function. A real-time control algorithm is then developed with the objective of maintaining low work-in-process inventory and keeping the production close to the demand. The algorithm uses a hierarchical control structure to generate the loading times for each product on each machine in real time and to respond to random disruptions in the system. The system is simulated using this algorithm to study its performance. The performance of the algorithm is also compared to alternative policies.     

用正交设计法优化导叶分段关闭规律的参数

本文介绍了正交设计法优化水轮机导叶分段关闭规律参数的方法，实例表明，此方法具有简单，准确和直观的优点。     

纳米复合材料——石墨层间化合物(GICs)的结构分析

本文调研了纳米复合材料——GICs(石墨层间化合物)结构的主要研究方法、原理及模型,并介绍了在GICs结构研究中用到的现代分析手段。     

CZ－2CFP离轨方案分析

针对ＣＺ－２Ｃ／ＦＰ（分配器）的离轨要求，对被动和主动两种离轨方案进行计算、分析和比较，最后选择主动离轨方案对ＣＺ－２ＣＦＰ在卫星分离后进行离轨，即在卫星分离后，用箭上姿控喷管将ＦＰ调姿至所需姿态，然后用剩余推进剂离轨，改变ＦＰ的轨道，使近地点高度降低，加快轨道衰减，达到离轨目的。这种主动离轨方案直接利用箭上姿控系统进行离轨，无需重新设计新的离轨系统，从而保持了原系统的简单和可靠并可以节省大量的经费。而且，主动离轨方案可以将ＦＰ同其它在轨飞行物之间的碰撞概率减小两个数量级还多，这对保证卫星的安全有很大的好处。     

移印钢版的制作

丝网印刷能够在不同材料的表面进行印刷.但在小面积,具有凹凸面的工件上印刷会有困难.移印工艺可通过制作不同截面积和硬度的胶头来实现各种复杂印刷,弥补了丝网印刷的不足.     

换热网络数值模拟稳定性分析

换热网络的数值模拟在换热网络的定量分析中起着重要作用。但在模拟计算中,有时表现出数值稳定性差。提高数值稳定性的方法,目前多通过改善算法来实现。本文通过对换热网络数值模拟的误差分析,提出了误差放大因子的概念,并依此选择迭代变量。通过对迭代变量的选择,达到提高换热网络数值模拟稳定性的目的。     

非平衡等离子体协同作用光催化剂催化降解苯

采用非平衡等离子体与光催化剂相结合,对苯的降解进行了实验研究。考察了以不同吸附能力的玻璃球和γ-Al2O3为载体对苯降解率、碳平衡、CO2选择性、NOx及O3生成量的影响;研究了以γ-Al2O3为载体时,水蒸气含量对苯的降解率、碳平衡、CO2选择性、NOx及O3生成量的影响。实验结果表明,以具有吸附性的γ-Al2O3为载体可提高苯的降解率;当能量密度为618J/L时,苯的降解率可达98%;同时可降低O3的生成量,但NOx生成量增加;以γ-Al2O3为载体时,随水蒸气含量的增加,苯的降解率降低,特别是在低能量密度时,水蒸气对苯降解率的影响更为显著,但水蒸气的加入可抑制O3的生成,同时可提高碳平衡值。     

New concept of surface modification to LiCoO2

As the continuance of our series study on LiCoO₂ surface modification, the complicated traditional surface coating method is replaced with simple addition of amorphous YPO₄ and Al₂O₃ in commercial LiCoO₂ or in commercial electrolyte based on our understanding to the improvement mechanism of surface modification. Comprehensive studies by X-ray photoelectron spectroscopy (XPS), gas chromatography and mass spectroscopy (GC–MS), inductively coupled plasma (ICP) and Fourier transformed infrared (FTIR) indicate that the products of spontaneous reaction between the additive and the LiPF₆ based electrolyte are responsible for the performance improvements.