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Search Results: 1 - 10 of 269546 matches for " <br>彭建文 "
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PROPERTIES OF D-η-PROPERLY PREQUASIINVEX FUNCTION
向量值映射D-η-预不变真拟凸的性质

Jian Wen PENG,<br>建文
系统科学与数学 , 2003,
Abstract: 引入了向量值映射的D-η- 预不变真拟凸等概念,在下D-半连续和上D-半连续条件下分别得到了向量值映射的D-η- 预不变真拟凸的等价命题,并讨论了向量值映射的D-η- 预不变真拟凸、D-η- 严格预不变真拟凸、D-η- 半严格预不变真拟凸的关系,证明了在一定条件下,向量优化问题(VP)的局部弱有效解一定是(VP)的全局弱有效解,这些结果推广了前人所得的相应结果。
Strictly B -Preinvex Functions
严格 B -预不变凸函数

Peng Jianwen,Zhu Daoli,<br>建文,朱道立
数学物理学报(A辑) , 2006,
Abstract: In this paper, a sufficient condition of the strictly B-preinvex function is firstly obtained. Then some properties of the strictly B-preinvex function are shown. Finally, some results for the minimization problem which the objective function is strictly B-preinvex are presented.
湖南油茶毛虫(LebedanobilisWalk)生活习性初步观察
建文
昆虫学报 , 1959,
Abstract:
变分不等式的新的外梯度方法
建文
重庆师范大学学报(自然科学版) , 2009, DOI: 10.11721/cqnuj20090402
Abstract: 本文引入了一个新的求解非扩张映射的不动点集和具有单调及Lipschitz连续映射的变分不等式的解集的公共元素的近似算法。这一算法是建立在外梯度方法和粘性逼近方法基础上的。在Hilbert空间上得到了这一算法产生序列的强收敛性定理。其内容如下设C是实Hilbert空间H中的非空闭凸集,映射AC→H是单调和k-Lipschitz连续的,SC→H是非扩张映射满足,其中和分别是S的不动点集和变分不等式的解集,fH→H是压缩映射,序列和由下列算法产生的,n=1,2,…,其中和是满足条件和和的数列,则和强收敛到,这里表示在上的投影。本文结果推广了文献中的一些著名结果。
BIOLOGY AND POPULATION FLUCTUATION OF CASINARIA NIGRIPES GRAVENHORST
黑侧沟姬蜂的生物学及种群消长规律研究

Ma Wanyan,<br>马万炎,建文,王溪林,左玉香
生态学报 , 1989,
Abstract: 黑侧沟姬蜂(Casinaria nigripes Gravenhorst)是马尾松毛虫(Dendrolimus punctotus Walker)的主要寄生天敌,它主要寄生1—4龄松毛虫幼虫,其最高寄生率达66.64%。 黑侧沟姬蜂的全世代发育起点温度为9.0±0.6℃,有效积温446.9日度,在湖南浏阳县每年发生6—7代,以幼虫在松毛虫幼虫体内越冬。幼虫老熟时钻出寄主,爬至松针或松枝上结茧化蛹。在不同的生境中,该蜂对松毛虫的寄生率有明显差异,以在松阔混交林中寄生率最高,对各代松毛虫的年平均寄生率可达36.58%,而在植被稀少的疏残松林中寄生率最低,仅11.66%。其寄生率还随寄主世代不同而异,一般以对第3代松毛虫的寄生率最高,第1代次之,第2代最低。该蜂种群数量逐年波动与全年霜冻日数成负相关,与当年7、8月份降雨量和10月份平均气温成正相关。
On level sets of E-convex function and E-quasiconvex function
有关E-凸函数和E-拟凸函数的水平集

QIN Chun-rong,PENG Jian-wen,<br>秦春蓉,建文
重庆邮电大学学报(自然科学版) , 2009,
Abstract: 通过反例说明文献1]给出的一些有关E-凸函数和E-拟凸函数水平集的错误性质,并对文献1]中错误结论进行了纠正,给出了E-凸函数和E-拟凸函数一些新的性质.
多目标规划问题的Φ-严格局部有效解 (三峡地区资源环境生态研究)
何越,建文
重庆师范大学学报(自然科学版) , 2013, DOI: 10.11721/cqnuj20130105
Abstract: 本文推广了多目标规划问题(MOP)的严格局部有效解的概念,提出了Φ?严格局部有效解的概念,从而研究带有不等约束的多目标规划问题的Φ严格局部有效解集的刻画。为了建立结构框架,分割了MOP的目标指标集来给出它的子问题RMOPJB((p<α,δ(x),xTX-0.5mmJB)),它比MOP有更少的目标函数。MOP的Φ严格局部有效解(Φs.l.e.s.)与它的子问题(RMOPJB((p<α,δ(x),xTX-0.5mmJB)))的局部有效解是有联系的。本文将通过定理来讨论它们的关系。本文还推广了强凸函数,提出了一个凸函数的新概念――Φ强凸函数,并通过Φ?强凸函数和KKT条件来刻画MOP的Φ?严格局部有效解。
基于旋量方法的高超声速飞行器三维非线性伪最优制导律设计
双春,建文, 汤国建, 陈克俊br>PENG Shuangchun, ZHU Jianwen, TANG Guojian, CHEN Kejun
- , 2015, DOI: 10.11887/j.cn.201506017
Abstract: 针对高超声速飞行器制导过程中的通道耦合问题, 设计一种基于旋量方法的三维非线性伪最优制导律。引入角度矢量、视线旋量、视线旋量速度等概念,通过等价性证明,得出视线旋量、视线旋量速度控制分别与视线方位、视线角速度控制具有一致性的结论,从而将制导问题转化为视线旋量和旋量速度的控制问题;基于旋量方法构建弹目视线旋量、视线旋量速度模型, 构建得到飞行器制导的三维非线性模型;为避免直接求解Riccati微分方程过程的复杂性,引入伪控制变量,将三维非线性制导模型转化为线性制导模型;分别针对无终端约束和有终端约束情况, 基于二次型最优方法得到三维非线性伪最优制导律。该制导律避免了通道解耦, 其制导参数又满足一定物理意义下的最优性。仿真结果验证了所设计制导律的有效性。
A new three-dimensional (3D) nonlinear pseudo optimal guidance law based on twist technology was proposed to resolve the coupling problem between different channels for the guidance of hypersonic vehicle. The basic concepts of angle vector, line-of-sight (LOS) twist and its rate were introduced, and through equivalence certification, the guidance problem was converted into control problem of LOS twist and twist rate, with the conclusion that the LOS twist and its rate control equals to the LOS orientation and LOS angle rate control. A 3D nonlinear guidance model was constructed on the basis of LOS twist and the rate models through twist technology. In addition, the 3D nonlinear model was decoupled into the linear one by introducing pseudo control variable to reduce the complicate resolution of differential Riccati equation. The 3D nonlinear pseudo optimal guidance laws were derived using linear quadratic regulator (LQR) corresponding to no ending constraint and ending constraints respectively. With these novel guidance laws, the decoupling process can be well avoided and the optimal characteristics of guidance parameters were ensured as well. The validity of these guidance laws was also validated through simulation experiments.
多约束下的高超声速飞行器三维非线性自适应末制导律
双春,建文, 汤国建, 陈克俊br>PENG Shuangchun, ZHU Jianwen, TANG Guojian, CHEN Kejun
- , 2016, DOI: 10.11887/j.cn.201606017
Abstract: 面向多约束下高超声速飞行器末制导过程中的通道耦合、参数扰动、模型失配等突出问题,设计一种适于高超声速飞行器的三维非线性自适应末制导律。为了模型描述的完整性和简洁性,引入视线旋量和旋量速度的概念,并基于此建立三维制导参考模型和实际系统的表达式;为了保证制导律的鲁棒性和自适应性,基于自适应控制理论,设计一种三维非线性自适应制导律;通过数学推导证明了该制导律的稳定性。该制导律能够从理论上克服高超声速飞行器末制导面临的通道耦合、参数扰动、模型失配等突出问题,满足多约束制导要求。仿真结果验证了所设计制导律的有效性。
Aiming at the multi-constraint terminal guidance of hypersonic vehicle, a novel 3D (three-dimensional) nonlinear adaptive terminal guidance law was proposed to resolve the problems of channel coupling, parameter perturbation and model mismatching. For the integrality and concision in model description, a 3D guidance reference model and its corresponding practical guidance system were both constructed on the basis of the concepts about line-of-sight twist and its rate. In order to guarantee the robustness and adaption, a 3D nonlinear adaptive guidance law was deduced on the basis of the adaptive control theory. The stability of this guidance law was proved through mathematical deduction. With this novel guidance law, the channel coupling, parameter perturbation and model mismatching problems were avoided and the multi constraint of terminal guidance was satisfied as well. The validity of this guidance law was also validated through simulation experiments.
确定压力隧洞混凝土衬砌初裂间距的钢筋混凝土曲梁法
守拙,建文
工程力学 , 2010,
Abstract: 压力隧洞钢筋混凝土衬砌的裂缝间距直接影响裂缝宽度,是限裂设计重要参数之一。4个现场水压试验的结果和实际经验表明:与建筑构件相比,衬砌初次开裂的特点是裂缝间距较大、条数较少。提供一个确定“初裂间距”的钢筋混凝土曲梁法,它能考虑配筋量、衬砌曲率、内水压力、围岩的法向及切向反力的作用,且计算较为简易。比较了本法和“弹性地基曲梁理论”的优缺点并进行了讨论。算例表明,两法计算结果大体一致,都能反映衬砌的初裂特点,较为符合实际。也可利用所提供的方法判断随着内水压的升高是否发生第二次开裂。
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