退耕还林政策影响下农户土地利用行为的博弈分析

使用博弈论对退耕还林政策实施以来的承包现象进行了分析,重点分析了承包户与种植户之间的利益关系。得出:(1)承包过程中,承包农户与种植农户形成了完全信息静态博弈关系;(2)在承包活动中,承包农户是主体;(3)若想博弈的均衡存在,承包农户应该提高承包费用。     

水爆清沙技术应用探讨

泵轮毛坯应用水爆清沙技术，产生较大的尺寸误差和形状误差，通过查找产生误差的原因，经多项工序实验和工艺探讨，不仅减少了损失，也闯出了一条保证整机质量的．同时也表明最有效的水爆清沙的400℃温度，适用于碗形叶轮封闭流道的铝合金铸件的清沙．     

微粉煤的摩擦电选

分析了中梁山煤的基本性质,对中梁山微粉煤进行摩擦电选实验研究,通过对电压、风量、粒度、湿度、不同分选室结构等因素的影响试验发现风量、电压越大分选效果越好,粒度在＜400目时分选效果最好,湿度越小,分选效果越好.     

Role of β(FeAl) nanoparticles in abnormal grain growth in the annealing of cast Cu-Al-Mn-Fe shape memory alloys

In this study, the low-cost production of Cu-Al-Mn-Fe shape memory alloy single crystals exceeding 46 mm by abnormal grain growth was realized only through annealing their cast alloys. The results show that the misorientation formed during annealing may be responsible for such abnormal grain growth process. It was confirmed that this misorientation resulted from the dissolution of bcc β(FeAl) nanoparticles during heat treatment at a sufficiently temperature of approximately 1173 K. The rate of migration of the abnormal grain boundary was experimentally measured to be approximately 9.3 × 10^-5 m s^-1 within 2 min of the commencement of abnormal grain growth. Additionally, the range of composition of the alloys that can lead to abnormal grain growth was determined. When the Cu-13.0Al-6.5Mn-3.2Fe single crystal close to the [100] direction was deformed to a pre-strain of 12%, full shape recovery happened without any residual strain. At that time, the superelastic strain was approximately 9%. Such a superelastic characteristic remained nearly constant over 50 cycles, showing excellent fatigue resistance. The superelastic properties of the present Cu-13.0Al-6.5Mn-3.2Fe single crystal are compared to those of commercial Ni-Ti-based shape memory alloys. Therefore, it can be considered as a new kind of superelastic material having practical applications. The obtained results should be of great significance in the development of Cu-based shape memory alloys. Furthermore, it is expected that a similar microstructure can be designed for the production of more metallic single crystals.     

含病变肝脏CT图象边界轮廓线的自动提取

对含病变肝脏ＣＴ图象进行特征提取，改进ｂｕｇ追踪算法，并利用中值滤波技术来消除噪声，提取出的边界轮廓线较为理想。     

磷矿石浮选中磨矿细度的确定

针对贵州某地磷矿石，进行了一系列磨浮试验，最终确定了该磷矿石在浮选工艺中了最佳磨矿细度为６８％－２００目。     

等强度轮幅的变薄旋压

介绍了ＡＳ２４．６０ＣＮＣ旋压机的旋压主程序及性能；推导出等强度轮幅旋压的毛坯尺寸计算公式；探讨了旋压参数选择中考虑的几个因素并给出了等强度轮幅旋压工艺的实例。     

华恒高硫煤硫分分布规律研究

通过对汶南华恒高硫煤各粒级和密度级硫分进行测定分析,探讨了其硫分随粒度和密度的变化规律,利用Design-Expert软件,确定出试验煤样中黄铁矿硫分随粒度和密度变化规律的数学模型.利用该模型可以较准确地预测华恒高硫煤中不同密度级和粒度级的黄铁矿硫分,为确定高硫煤中黄铁矿解离粒度提供了新途径.     

ZnO 玻璃系压敏电阻配方研究

研究了 Zn O玻璃系压敏电阻的材料组成对其微观结构和电性能的影响 .发现玻璃料的添加量 w玻璃料 一般在 8.0 %～ 1 0 .0 %时效果最佳 .Sb2 O3的引入可生成 Zn7Sb2 O1 2 尖晶石相 ,抑制晶粒的生长 ,并使压敏场强E和非线性系数 α值增加 .Co和 Mn的添加使界面态密度增加 ,引起势垒升高 ,使非线性特性显著提高     

Projection算法在粒子尺寸测量中的实验研究

提出了ｐｒｏｊｅｃｔｉｏｎ迭代算法在激光粒度测量中的算法停止迭代条件，提高了Ｐｒｏｊｅｃ－ｔｉｏｎ算法在实际粒子尺寸测量中的适用性。通过对国家标准物质研究中心提供的微粒标准物质及其混合的实际测试实验，证实了Ｐｒｏｊｅｃｔｉｏｎ算法及其停止迭代条件在粒度测量中的有效性及鲁棒性。