鲁棒复合优化问题的Lagrange对偶

利用共轭函数的上图性质,引入两类新的约束规范条件,等价刻画了鲁棒复合优化问题与其对偶问题之间的Lagrange零对偶,强对偶,稳定零对偶及稳定强对偶,推广和改进了前人的相关结论.     

Optical limiting performances of transitional metal dichalcogenides MX2(M = V,Nb, Ta; X = S,Se) with ultralow initial threshold and optical limiting threshold

The optical limiting performances of few-layer transitional metal dichalcogenides (TMDs) nanosheets in the VB group(VS₂,VSe₂,Nb S₂,Nb Se₂,Ta S₂,and Ta Se₂) were systematically investigated for the first time,to the best of our knowledge.It was found that these TMDs nanosheets showed a normalized transmittance in the range of 20%–40%at the input energy of 1.28 GW/cm².Ultralow initial threshold F_S(0.05–0.10 J/c...     

MA量级螺线圈型爆磁压缩发生器

采用多分支螺线圈型爆磁压缩发生器数值模拟程序MFCG8-7进行理论模拟及参数优化,设计了EMG-125型螺线圈型发生器,并开展了实验研究。电感负载实验结果表明：EMG-125型发生器可以在25 nH电感负载上输出大于3 MA脉冲电流,负载能量大于100 kJ,电磁能量放大50倍。     

超连续光谱细胞无损伤非侵入式检测技术的研究

中国在庞大的人口基数下拥有丰富的遗传资源,这些资源可能被国外非法掠夺以获取利益,非法掠夺的过程揭示可能存在一些安全隐患,例如传染疾病的扩散等.如何加强对中国公民遗传资源的保护,促进国际间正常合法的信息共享和科研合作已成为生物安全的新问题.为加强人体细胞及其制品等特殊生物物品出入境管理,防止遗传资源流失和有害物品传入,促...     

一个聚类数动态可调的水声信号聚类算法

本文提出了一种可动态调整聚类数的K-均值聚类训练算法。该方法利用样本的已知模式知识,有师地进行聚类中心和聚类数的训练,从而有效地跳出误差平方损失函数局部极小,并减少类间重叠。经对实录舰船等水中目标辐射噪声信号的分析试验,证明该方法有较好的聚类效果。     

脆性材料概率强度的研究

本文基于混凝土材料的破坏性实验,建立了材料内部缺陷的多类裂纹模型,并由此推导出了脆性材料的概率强度分布式.理论分析与实验结果吻合较好.     

TIGHT-BINDING MOLECULAR DYNAMICS STUDY OF C60-GRAPHITE COLLISIONS

We report the tight-binding molecular dynamics simulations of C₆₀ impacting on a graphite (0001) surface with different incident energy. The simulations provide detailed characterizations of the microscopic processes occurring during the collisions and show insight into the deposition mechanisms of C₆₀ on semiconductor substrate.     

Occurrence and elimination of in-plane misoriented crystals in AIN epUayers on sapphire via pre-treatment control

AlN epilayers are grown directly on sapphire （0001） substrates each of which has a low temperature AlN nucleation layer. The effects of pretreatments of sapphire snbstrates, including exposures to NH3/H2 and to H2 only ambients at different temperatures, before the growth of AlN epilayers is investigated. In-plane misoriented crystals occur in N-polar AlN epilayers each with pretreatment in a H2 only ambient, and are characterized by six 60°-apart peaks with splits in each peak in （1012） phi scan and two sets of hexagonal diffraction patterns taken along the [0001] zone axis in electron diffraction. These misoriented crystals can be eliminated in AlN epilayers by the pretreatment of sapphire substrates in the NH3/H2 ambient. AlN epilayers by the pretreatment of sapphire substrates in the NH3/H2 ambient are Al-polar. Our results show the pretreatments and the nucleation layers are responsible for the polarities of the AlN epilayers. We ascribe these results to the different strain relaxation mechanisms induced by the lattice mismatch of AlN and sapphire.     

南充市表层土壤中多环芳烃的源解析研究

运用同分异构体比率、聚类分析法和主成分因子载荷法对南充市表层土壤多环芳烃(PAHs)污染源进行了定性和定量分析。研究表明:同分异构体比率分析揭示表层土壤中PAHs污染来源以燃烧源为主;聚类分析将土壤中13种PAHs组分分成3个主群,3个主群分别指示为交通类PAHs污染、煤燃烧类PAHs污染和混合类PAHs污染。主成分因子/多元线性回归分析显示,PAHs主要来源于3大污染源,并定量计算了3种源的贡献量,其中交通燃油污染的贡献率最大(占42.4%),而燃煤燃烧排放、混合污染所占比例分别为32.4%和25.2%。     

HSSPME-GC-MS联用分析墨吉对虾储藏过程挥发性有机物特征的变化

建立了顶空固相微萃取-气相色谱-质谱联用分析墨吉对虾挥发性有机物(VOCs)的方法,结合化学计量学方法解析了墨吉对虾储藏过程中VOCs特征的变化,初步研究了VOCs特征变化与其鲜度的关系.采用上述方法,在新鲜和变质墨吉对虾样品中分别检测到22种和16种VOCs组分.采用主成分分析解析新鲜、储藏过程及变质阶段对虾样品的VOCs色谱特征,结果表明墨吉对虾变质前后VOCs特征有明显不同的聚类规律,且对虾样品储藏过程中VOCs特征从新鲜到变质状态呈现逐步过渡的趋势,对虾储藏过程VOCs特征的变化可以提供更加准确的鲜度变化预警信息.最后,采用共有模式统计对比了新鲜和变质墨吉对虾VOCs特征聚类数据,获得对样品变质前后VOCs特征差异贡献前5位VOCs,可作为潜在的鲜度判别预警VOCs标志物.