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孤雌拟长跗摇蚊实验室规模培养技术及生活史研究 被引量:1
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作者 姜永伟 卢雁 +2 位作者 丁振军 杜晶 王俊才 《现代农业科技》 2014年第5期237-238,240,共3页
研究了孤雌拟长跗摇蚊实验室连续规模培养技术,在恒温20、25、28℃条件下对其生活史进行了详细地记录。结果显示:槐叶-黏土培养基适于作为该种摇蚊的食物及筑巢来源。生活史方面,恒温20℃条件下,约25.5 d经历1个世代;恒温25℃,约19.5 d... 研究了孤雌拟长跗摇蚊实验室连续规模培养技术,在恒温20、25、28℃条件下对其生活史进行了详细地记录。结果显示:槐叶-黏土培养基适于作为该种摇蚊的食物及筑巢来源。生活史方面,恒温20℃条件下,约25.5 d经历1个世代;恒温25℃,约19.5 d经历1个世代;恒温28℃,约15.5 d经历1个世代。又因该种生物对水质反应敏感,适于作为模式生物进行开发。 展开更多
关键词 雌拟跗摇蚊 实验室培养 生活史 模式生物
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谐波齿轮传动中理论啮合弧长的计算
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作者 傅志红 《株洲工学院学报》 1993年第4期52-56,共5页
关键词 谐波齿轮传动 理论啮合孤长 啮合
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拉钩位置对引线拉力试验键合强度测试值影响分析 被引量:1
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作者 凌勇 吕音 《电子与封装》 2016年第1期1-4,共4页
通过建立键合点键合拉力试验的力学模型,分析了吊钩位置、弧线长度、键合点高度差等对测试结果的影响。并比较了GJB548-2005方法2011.1与MIL-STD-883J方法2011.9关于双键合点键合拉力试验拉钩位置的具体差异,最后提出了相关改进建议。
关键词 双键合点拉力测试 吊钩位置 孤长 键合点高度差
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螺旋输送器——均衡螺旋曲面的设计计算
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作者 昂盛新 张建平 邓传芸 《大学数学》 1991年第4期44-49,共6页
本文对两种均衡螺旋曲面——导程呈线性递增的正圆柱螺旋曲面和曲面宽呈线性递增的等导程螺旋曲面的形成及其规律进行论述,并且导出螺旋曲线的空间轨迹方程,由空间轨迹方程进而推导出螺旋曲面的导线孤长和面积的计算方法。
关键词 均衡螺旋曲面 螺旋输送器 线性递增导程 圆柱 曲线孤长 曲线面积 计算
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平面沉积相联合编图原理、方法及应用——以准噶尔盆地陆西地区为例 被引量:1
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作者 冯动军 《内蒙古石油化工》 CAS 2009年第23期22-24,共3页
在地震资料解释中,常常遇到各三维区块没有拼接处理的情况,由于各三维地震工区的地震资料采集时间不同、地震品质差别较大、极性和频率不一致,这些都给三维连片地震资料解释及地震属性分析带来一定的困难,从而制约了平面相图的联合编制... 在地震资料解释中,常常遇到各三维区块没有拼接处理的情况,由于各三维地震工区的地震资料采集时间不同、地震品质差别较大、极性和频率不一致,这些都给三维连片地震资料解释及地震属性分析带来一定的困难,从而制约了平面相图的联合编制。本文着眼于运用各种方法使得地震属性闭合,然后再利用含砂率与地震属性拟合法和孤长属性法来预测平面含砂率的走势,进而结合岩心、录井、测井及地震属性编制平面沉积相图,寻找研究区岩性地层圈闭的有利区带。 展开更多
关键词 拼接处理 极性 地震属性 含砂率 孤长属性 有利区带
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关于定积分应用的一点注记
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作者 周军 《数学教学研究》 2009年第5期49-50,共2页
利用微元素法的思想,通过讨论一些平面区域的重心坐标的计算公式及旋转体的体积与平面图形的重心之间的关系,得到了平面曲线的重心坐标的计算公式及旋转曲面的面积与曲线的重心之间的关系.
关键词 静力矩 重心 微元素法 体积 面积 孤长
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Multi-phase bus signal priority strategy at isolated intersections
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作者 王琳虹 别一鸣 +1 位作者 王殿海 宋现敏 《Journal of Southeast University(English Edition)》 EI CAS 2011年第4期430-435,共6页
To satisfy the multiple priority requests from buses that arrive at different phases within a small time window, a multi-phase bus signal priority (MPBSP) strategy is developed. The proximity principle is brought fo... To satisfy the multiple priority requests from buses that arrive at different phases within a small time window, a multi-phase bus signal priority (MPBSP) strategy is developed. The proximity principle is brought forward to settle the conflicts among multiple priority requests and arrange the optimal priority sequence. To avoid over saturation of the intersection, a conditional MPBSP algorithm that adopts early green and green extension strategies is developed to give priority to the bus with the highest priority level when green time that each phase runs makes its saturation degree not larger than 0. 95. Finally, the algorithm is tested in the VISSIM environment and compared with the normal signal timing algorithm. Sensitive analysis of the number of priority phases, bus demand, and volume to capacity ratios are conducted to quantify their impacts on the benefits of the MPBSP. Results show that the MPBSP strategy can effectively reduce bus delays, and with the increase in the number of priority phases, the reduction range of bus delays also increases. 展开更多
关键词 bus signal priority multiple phases early green green extension isolated intersection
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关于椭圆曲线建筑物的放样计算
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作者 陈国平 刘丽娟 《经济技术协作信息》 2007年第20期78-78,共1页
在实际施工中,我们经常要遇到椭圆曲线。本文通过微分几何中关于椭圆曲线点的计算进行推导分析,得出两种求椭圆曲线点的方法。结合计算机语言进行编程设计,使得这两种计算方法在工程实际施工中更为简捷便利。
关键词 椭圆曲线点 平距 孤长 编程
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Exotic Localized Coherent Structures of the (2+1)—Dimensional Dispersive Long—Wave Equation 被引量:11
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作者 ZHANGJie-Fang 《Communications in Theoretical Physics》 SCIE CAS CSCD 2002年第3期277-282,共6页
This article is concerned with the extended homogeneous balance method for studying the abundant localized solution structures in the (2+1)-dimensional dispersive long-wave equations . Starting from the homogeneous ba... This article is concerned with the extended homogeneous balance method for studying the abundant localized solution structures in the (2+1)-dimensional dispersive long-wave equations . Starting from the homogeneous balance method, we find that the richness of the localized coherent structures of the model is caused by the entrance of two variable-separated arbitrary functions. For some special selections of the arbitrary functions, it is shown that the localized structures of the model may be dromions, lumps, breathers, instantons and ring solitons. 展开更多
关键词 extended homogeneous balance method coherent soliton structures dispersive long-wave equation the (2+1)-dimensions
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Controlling the Collision Between Two Solitons in a Two-Component Condensate by Interspecies Interactions 被引量:1
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作者 张志强 王登龙 +1 位作者 罗晓清 丁建文 《Communications in Theoretical Physics》 SCIE CAS CSCD 2011年第9期440-444,共5页
We present a family of the solutions of two-component Bose-Einstein condensates with time-dependentscattering length by means of multiple-scale method.Our numerical calculations show that the collision properties (the... We present a family of the solutions of two-component Bose-Einstein condensates with time-dependentscattering length by means of multiple-scale method.Our numerical calculations show that the collision properties (theposition,the time,and the frequency of the collision) between two solitons can be controlled by the time-dependentinterspecies scattering length.Meanwhile,we also find that the amplitude of the solitons is close related to the timedependentinterspecies scattering length. 展开更多
关键词 Bose Einstein condensate SOLITON interspecies scattering length
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Matter-Wave Solitons in Two-Dimensional Bose—Einstein Condensates with Time-Dependent Scattering Length in a Harmonic Trap
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作者 刘晓蓓 李彪 《Communications in Theoretical Physics》 SCIE CAS CSCD 2011年第9期445-450,共6页
We present three families of one-soliton solutions for (2+1)-dimensional Gross-Pitaevskii equation with both time-dependent scattering length and gain or loss in a harmonic trap. Then we investigate the dynamics of... We present three families of one-soliton solutions for (2+1)-dimensional Gross-Pitaevskii equation with both time-dependent scattering length and gain or loss in a harmonic trap. Then we investigate the dynamics of these solitons in Bose-Einstein condensate8 (BECs) by some selected control functions. Our results show that the intensities of these solitons first increase rapidly to the condensation peak, then decay very slowly to the background; thus the lifetime of a bright soliton, a train of bright solitons and a dark soliton in BECs can be all greatly extended. Our results offer a useful method for observing matter-wave solitons in BECs in future experiments. 展开更多
关键词 matter-wave solitons Bose-Einstein condensates 2D Gross-Pitaevskii equation
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Dynamics of Periodic Waves in Bose-Einstein Condensate with Time-Dependent Atomic Scattering Length
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作者 LI Hua-Mei 《Communications in Theoretical Physics》 SCIE CAS CSCD 2007年第1期63-68,共6页
Evolution of periodic waves and solitary waves in Bose-Einstein condensates (BECs) with time-dependent atomic scattering length in an expulsive parabolic potential is studied. Based on the mapping deformation method... Evolution of periodic waves and solitary waves in Bose-Einstein condensates (BECs) with time-dependent atomic scattering length in an expulsive parabolic potential is studied. Based on the mapping deformation method, we successfully obtain periodic wave solutions and solitary wave solutions, including the bright and dark soliton solutions.The results in this paper include some in the literatures [Phys. Rev. Lett. 94 (2005) 050402 and Chin. Phys. Left. 22 (2005) 1855]. 展开更多
关键词 Gross-Pitaevskii equation periodic wave time-dependent atomic scattering length mapping deformation method
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Effect of Time-Dependent Atomic Scattering Length on Solitons in Bose-Einstein Condensates with a Complex Potential
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作者 WANG Tian-Yuan 《Communications in Theoretical Physics》 SCIE CAS CSCD 2009年第2期255-258,共4页
We consider the one-dimensional nonlinear Schrǒdinger equations that describe the dynamics of a Bose-Einstein Condensates with time-dependent scattering length in a complex potential. Our results show that as long as... We consider the one-dimensional nonlinear Schrǒdinger equations that describe the dynamics of a Bose-Einstein Condensates with time-dependent scattering length in a complex potential. Our results show that as long as the integrable relation is satisfied, exact solutions of the one-dimensional nonlinear Schrǒdinger equation can be found in a general closed form, and interactions between two solitons are modulated in a complex potential We find that the changes of the scattering length and trapping potential can be effectively used to control the interaction between two bright soliton. 展开更多
关键词 Bos-Einstein condensate scattering length SOLITON
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Standing,Periodic and Solitary Waves in (1+1)-Dimensional Caudry-Dodd-Gibbon-Sawada-Kortera System
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作者 郑春龙 强继业 王绍华 《Communications in Theoretical Physics》 SCIE CAS CSCD 2010年第12期1054-1058,共5页
In the paper, the variable separation approach, homoclinic test technique and bilinear method are successfullyextended to a (1+1)-dimensional Caudry-Dodd-Gibbon-Sawada-Kortera (CDGSK) system, respectively.Basedon the ... In the paper, the variable separation approach, homoclinic test technique and bilinear method are successfullyextended to a (1+1)-dimensional Caudry-Dodd-Gibbon-Sawada-Kortera (CDGSK) system, respectively.Basedon the derived exact solutions, some significant types of localized excitations such as standing waves, periodic waves,solitary waves are simultaneously derived from the (1+1)-dimensional Caudry-Dodd-Gibbon-Sawada-Kortera systemby entrancing appropriate parameters. 展开更多
关键词 CDGSK type model variable separation approach homoclinic test technique standing wave periodic wave solitary wave
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Rational Form Solitary Wave Solutions and Doubly Periodic Wave Solutions to (1+1)-Dimensional Dispersive Long Wave Equation 被引量:1
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作者 WANGQi CHENYong ZHANGHong-Qing 《Communications in Theoretical Physics》 SCIE CAS CSCD 2005年第6期975-982,共8页
In this work we devise an algebraic method to uniformly construct rational form solitary wave solutions and Jacobi and Weierstrass doubly periodic wave solutions of physical interest for nonlinear evolution equations.... In this work we devise an algebraic method to uniformly construct rational form solitary wave solutions and Jacobi and Weierstrass doubly periodic wave solutions of physical interest for nonlinear evolution equations. With the aid of symbolic computation, we apply the proposed method to solving the (1+1)-dimensional dispersive long wave equation and explicitly construct a series of exact solutions which include the rational form solitary wave solutions and elliptic doubly periodic wave solutions as special cases. 展开更多
关键词 elliptic equation rational expansion method rational form solitary wavesolutions rational form jacobi and weierstrass doubly periodic wave solutions symboliccomputation (1+1)-dimensional dispersive long wave equation
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Isolated lymphoid follicles in colon: Switch points between inflammation and colorectal cancer? 被引量:4
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作者 Ferenc Sipos Gyrgyi Müzes 《World Journal of Gastroenterology》 SCIE CAS CSCD 2011年第13期1666-1673,共8页
Gut-associated lymphoid tissue is supposed to play a central role in both the organization of colonic repair mechanisms and colorectal carcinogenesis. In inflammatory conditions, the number, diameter and density of is... Gut-associated lymphoid tissue is supposed to play a central role in both the organization of colonic repair mechanisms and colorectal carcinogenesis. In inflammatory conditions, the number, diameter and density of isolated lymphoid follicles (ILFs) increases. They are not only involved in immune surveillance, but their presence is also indispensable in normal mucosal regeneration of the colon. In carcinogenesis, ILFs may play a dual role. On the one hand they may support tumor growth and the metastatic process by vascular endothelial growth factor receptor signaling and producing a specific cytokine and cellular milieu, but on the other hand their presence is sometimes associated with a better prognosis. The relation of ILFs to bone marrow derived stem cells, follicular dendritic cells, subepithelial myofibroblasts or crypt formation, which are all involved in mucosal repair and carcinogenesis, has not been directly studied. Data about the putative organizer role of ILFs is scattered in scientific literature. 展开更多
关键词 Isolated lymphoid follicle COLON Mucosal repair Colorectal cancer Epithelial stem cell MYOFIBROBLAST Follicular dendritic cell Mesenchymal-epithelial transition Epithelial-mesenchymal transition
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N-Fold Darboux Transformation and Bidirectional Solitons for Whitham-Broer-Kaup Model in Shallow Water
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作者 王雷 高以天 +3 位作者 盖晓玲 孟得新 吕兴 于鑫 《Communications in Theoretical Physics》 SCIE CAS CSCD 2010年第3期413-422,共10页
Under investigation in this paper is the Whitham-Broer-Kaup (WBK) system, which describes the dispersive long wave in shallow water. Through a variable transformation, the WBK system is casted into a general Broer-Kau... Under investigation in this paper is the Whitham-Broer-Kaup (WBK) system, which describes the dispersive long wave in shallow water. Through a variable transformation, the WBK system is casted into a general Broer-Kaup system whose Lax pair can be derived by the Ablowitz-Kaup-Newell-Segur technology. With symbolic computation, based on the aforementioned Lax pair, the N-fold Darboux transformation is constructed with a gauge transformation and the multi-soliton solutions are obtained. Finally, the elastic interactions of the two-soliton solutions (including the head-on and overtaking collisions) for the WBK system are graphically studied. Those multi-soliton collisions can beused to illustrate the bidirectional propagation of the waves in shallow water. 展开更多
关键词 Whitham Broer-Kaup system Bidirectional solitons Multi-soliton solutions N-fold Darboux transformation Lax pair
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Interaction Behaviours Between Solitons and Cnoidal Periodic Waves for (2+1)-Dimensional Caudrey–Dodd–Gibbon–Kotera–Sawada Equation 被引量:1
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作者 程雪苹 王建勇 +1 位作者 任博 杨云青 《Communications in Theoretical Physics》 SCIE CAS CSCD 2016年第8期163-170,共8页
The consistent tanh expansion(CTE) method is employed to the(2+1)-dimensional Caudrey–Dodd–Gibbon–Kotera–Sawada(CDGKS) equation. The interaction solutions between solitons and the cnoidal periodic waves are explic... The consistent tanh expansion(CTE) method is employed to the(2+1)-dimensional Caudrey–Dodd–Gibbon–Kotera–Sawada(CDGKS) equation. The interaction solutions between solitons and the cnoidal periodic waves are explicitly obtained. Concretely, we discuss a special kind of interaction solution in the form of tanh functions and Jacobian elliptic functions in both analytical and graphical ways. The results show that the profiles of the soliton-cnoidal periodic wave interaction solutions can be designed by choosing different values of wave parameters. 展开更多
关键词 soliton-cnoidal periodic wave interaction solution consistent tanh expansion method (2+1)-dimensional Caudrey–Dodd–Gibbon–Kotera–Sawada equation
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Nonautonomous Dark Solitons and Rogue Waves in a Graded-Index Grating Waveguide
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作者 刘冲 杨战营 +1 位作者 杨文力 岳瑞宏 《Communications in Theoretical Physics》 SCIE CAS CSCD 2013年第3期311-318,共8页
We analytically present a family of nonautonomous dark solitons and rogue waves in a planar graded-index grating waveguide with an additional long-period grating.The dark solitons whose dynamics described by the expli... We analytically present a family of nonautonomous dark solitons and rogue waves in a planar graded-index grating waveguide with an additional long-period grating.The dark solitons whose dynamics described by the explicit expressions such as the valley,background and wave central position are investigated.We find that dark soliton's depth and the long-period grating have effects on soliton's wave central position;the gain or loss term affects directly both the background and valley of the soliton.For rogue waves,it is reported that one can modulate the distribution of the light intensity by adjusting the parameters of the long-period grating.Additionally,more rogue waves with different evolution behaviors in this special waveguide are demonstrated clearly. 展开更多
关键词 nonautonomous darks'oliton nonautonomous rogue wave graded-index grating waveguide dy-namical property
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