离子束在玉米、孔雀草和鲁冰花等育种中的应用

针对离子束对玉米、孔雀草和鲁冰花育种的影响,探讨了离子束育种的机理以及离子注入的特点.采用低能和高能离子束辐照玉米、孔雀草和鲁冰花,进行育种试验.玉米离子注入研究结果表明M1代发现矮化株和特健壮株.离子注入的单株孔雀草出现黄色的单瓣和彩色的重瓣.鲁冰花花期提前15天、叶子卷曲等变异.     

离子注入在生物工程上的应用

本文介绍了离子注入在生物工程上的应用．报道了离子束生物技术应用于生物品种改良和外源基因转移所取得的成果,及我们近期所研究的与此相关的其他成果．     

离子注入作物改良和生物效应研究的进展

本文讨论了将离子注入技术应用到生物品种的改良，荷能离子与生物体相互作用的一般原理．探讨了注入离子动量、能量和质量沉积过程的生物效应，报导了离子注入诱变育种所取得的成果．     

空心圆管内表面等离子体源离子注入鞘层的数值模拟

建立了一维无碰撞流体动力学模型，针对柱形容器，考察了无附加电极和在中心轴线处放置零电位附加电极两种情况下，空心圆管内部等离子体鞘层的演化过程。得出了各自情况下鞘层中电势分布、离子密度分布，空心圆管内表面离子束流密度分布和离子注入剂量分布．     

δ-函数在离子溅射热峰效应中的应用

热峰效应发生在离子束注入及激光表面材料处理过程中．引进了δ函数来描述热峰在离子溅射中的效应,从经典的热传导方程出发,对球形热峰效应及圆柱形热峰效应作了特别讨论,发现不同形状的热峰在材料处理过程中会引起不同程度的非线性效应     

空心圆管内表面等离子体源离子注入鞘层的数值模拟

建立了一维无碰撞流体动力学模型,针对柱形容器,考察了无附加电极和在中心轴线处放置零电位附加电极两种情况下,空心圆管内部等离子体鞘层的演化过程。得出了各自情况下鞘层中电势分布、离子密度分布,空心圆管内表面离子束流密度分布和离子注入剂量分布.     

强流脉冲离子束辐照钢靶热力学效应数值模拟

为了揭示强流脉冲离子束辐照材料表面的热力学效应,介绍了强流脉冲离子束与钢靶相互作用的理论模型.以此为基础,通过数值模拟计算了离子能量为300keV,束流密度为200A/cm2的离子束与钢靶相互作用的热力学效应,得到了温度场分布、温度梯度分布,以及应力与应力波传播过程的模拟计算结果,结果表明辐照后材料表面在极短时间内发生了剧烈的温度与应力变化.     

离子注入航空轴承延寿应用研究

航空轴承的使用寿命普遍较短。通过大量数据统计分析和失效轴承进一步研究，发现航空轴承使用中存在的主要问题是腐蚀和磨损。经离子注入航空轴承材料的各种试验表明，试验材料表面产生了非晶态物质，其耐腐蚀性能显提高，耐磨性提高两倍以上。同时，针对离子注入航空轴承而研制的离子束多功能机，解决了球面无法均匀注入的难题。经离子注入的航空轴承，目前在航空发动机中得到较广泛的应用，不仅顺利通过了工厂台架试车和地面燃机试验，而且所发往空军使用的航空轴承到目前为止，均表现良好。     

生物医学电磁场若干问题的研究

生物医学电磁场问题的研究是多学科交叉研究,属于当今国际电磁场研究的前沿领域．本文总结了河北工业大学生物电磁技术课题组近期的一些研究工作,主要包括脑电场的建模与数值求解和强磁场对细胞的生物学效应．文中对脑电场建模与数值求解和强磁场对细胞的生物学效应的研究意义、研究方法进行了综述,并给出了主要研究结果．     

MEVVA源注入Fe，Ti离子对A12O3单晶体表面着色的影响

MEVVA源离子注入机对无色合成刚玉进行一定剂量的Fe离子、Ti离子注入．改变后期的不同热处理条件，获得了橙黄色和蓝色蓝宝石，通过XPS、紫外可见分光光度计对部分样品的元素价态、吸收谱进行了测试发现：Fe离子注入呈现橙黄色，是d轨道能级分裂所致；单独注入Ti离子呈现蓝色，认为是色心或金属与非金属之间电荷转移所致．     

类金刚石薄膜的离子注氮研究

以25～35kV的高能离子束将离子化的双原子分子N+2注入非晶态碳膜,硬度可提高10GPa量级.分析研究表明:离子注氮并没有改变碳膜的非晶态结构,但所有拉曼结构参数发生变化,且碳、氮结合能峰位发生化学位移;显然注入的氮和碳形成化学键,并可能形成新相. 结论:类金刚石薄膜离子注氮可合成氮化的类金刚石,改变化学结构,提高机械性能.     

Anticoagulation property and security of artificial heart valve material

Cardiovascular disease becomes one of the primary diseases that cause human death.Artificial heart valve’s replacement is the only way to save lives of the patients whoseheart valve is badly pathologically changed by rheumatic heart disease, retrogressiveheart disease, and bacterium caused endocarditis disease. The clinically used artificialheart valves are classified into biomedical heart valve and mechanical heart valve. Thebiocompatibility and anti-thrombus property of the biomedical heart…     

The modification behaviour for Si implanted PET

Polymeric solids have low density, high ability to form intricate shapes, versatile electronic properties and low manufacturing cost. However their uses are still limited by their inherent softness and unexpected dielectric properties. In order to enhance their electrical and mechanical properties, ion implantation techniques have been explored[1—3]. Recent studies have shown that ion implantation is very effective for improving surface properties of polymers such as surface hardness and wear…     

Chemieal Bonding States of TiC Films before and after Hydrogen Ion Irradiation

TiC films deposited by rf magnetron sputtering followed by Ar＋ ion bombardment were irradiated with a hydrogen ion beam. X-ray photoelectron spectroscopy （XPS） was used for characterization of the chemical bonding states of C and Ti elements of the TiC films before and after hydrogen ion irradiation, in order to understand the effect of hydrogen ion irradiation on the films and to study the mechanism of hydrogen resistance of TiC films. Conclusions can be drawn that ion bombardment at moderate energy can cause preferential physical sputtering of carbon atoms from the surface of low atomic number （Z） material. This means that ion beam bombardment leads to the formation of a non-stoichiometric composition of TiC on the surface. TiC films prepared by ion beam mixing have the more excellent characteristic of hydrogen resistance. One important cause, in addition tO TiC itself, is that there are many vacant sites in TiC created by ion beam mixing. These defects can easily trap hydrogen and effectively enhance the effect of hydrogen resistance.     

生物工艺实验改革研究与实践

生物工程作为一门实践性很强的学科,综合性、设计性及研究性实验教学在应用型创新人才培养过程中显得尤为重要,我们通过合理设置实验项目、改革实验教学方式及考核方式,对生物工艺实验进行了改革,对培养社会需要的高级应用型创新人才起到了积极的作用。     

Effect of heating on hydrogen retention in C-SiC coatings

C-SiC coatings were prepared on stainless steel with magnetron sputtering deposition followed by Argon ion bombardment. These samples were implanted by 5 keV hydrogen ion beam. SEM, SIMS and IR transmission were utilized to study the mechanism and the stability of hydrogen retention of C-SiC coatings. Comparison was made between the samples with and without removing Argon by heating then followed by H^＋ ion implantation. The results show that removal of argon by heating can improve the hydrogen retention of the C-SiC coatings. The thermal stability of hydrogen barrier for the C-SiC coatings was investigated, it is found that the property of hydrogen retention for the C-SiC coatings is still good after heating at 573 K, but it becomes worse after heating at 873 K, and it loses after heating at 1 173 K.     

ZnS离子束抛光过程中的粗糙度演变

为了得到离子束抛光ZnS的工艺参数,采用微波离子源作为抛光源,分析了离子束能量、离子束流大小、离子束入射角度对ZnS刻蚀速率及表面粗糙度的影响,比较了ZnS刻蚀速率及表面粗糙度的变化趋势.研究结果表明:当离子束能量为400eV、离子束流大小为35mA、入射角度为45°时,ZnS表面粗糙度降低了0.23nm.