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关于北海道一号荞麦综合农艺措施数学模型试验研究简结
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作者 孙秉宪 白凯军 张兴武 《农业系统科学与综合研究》 CSCD 北大核心 1990年第4期59-62,共4页
为了发展荞麦生产,1987年我们专赴延安地区考察引进了产量高质优粒大的日本北海道一号荞麦新品种,在积极开展大面积引种丰产示范的同时,于环县西部荞麦主产区的毛井乡设置了北海道一号养麦综合农艺措施数学模型研究试验,以期提出该品种... 为了发展荞麦生产,1987年我们专赴延安地区考察引进了产量高质优粒大的日本北海道一号荞麦新品种,在积极开展大面积引种丰产示范的同时,于环县西部荞麦主产区的毛井乡设置了北海道一号养麦综合农艺措施数学模型研究试验,以期提出该品种丰产栽培的农艺措施优化组合方案,为实现荞麦的稳产、高产、优质、低成本服务。 展开更多
关键词 荞麦 数学模型试验 栽培技术
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基于数学模型分析的人工环抱型港口防波堤平面布置研究 被引量:1
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作者 陈志冰 《福建交通科技》 2018年第3期128-131,共4页
人工环抱型港口的平面布置是工程设计的关键内容之一。本文以实际工程为例,通过数学模型试验分析,介绍人工环抱型港口平面布置所考虑的主要因素、设计方案要点,为今后类似工程设计提供参考。
关键词 人工环抱型港口 防波堤 平面布置 数学模型试验
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高防浪墙土石坝波浪爬高对比分析 被引量:1
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作者 银佳男 张彦泽 +2 位作者 杨海滔 王胜利 曹宇隆 《水电能源科学》 北大核心 2023年第8期98-100,65,共4页
针对高防浪墙在坝坡坝顶附近由倾斜变为直立的情况,利用数值模拟和物理模型试验的方法对波浪爬高计算进行相互印证。对不同波浪要素、坝前水深工况进行分析,研究高防浪墙对水库波浪爬高的影响。结果表明,同一波浪要素针对不同水库水深时... 针对高防浪墙在坝坡坝顶附近由倾斜变为直立的情况,利用数值模拟和物理模型试验的方法对波浪爬高计算进行相互印证。对不同波浪要素、坝前水深工况进行分析,研究高防浪墙对水库波浪爬高的影响。结果表明,同一波浪要素针对不同水库水深时,波浪爬高随着水库水深呈倒抛物线趋势;波浪爬高在水深位于防浪墙直立段与坝坡斜坡段交汇处最大;当墙前水深高于直立段与斜坡段交汇处时,与数模和物模结果相比,规范法计算的波浪爬高偏大。研究结果可为土石坝工程设计时考虑波浪爬高影响的高防浪墙顶高程精细化设计提供参考。 展开更多
关键词 高防浪墙土石坝 波浪爬高 规范法 数学物理模型试验
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水电站导漂建筑物研究现状 被引量:7
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作者 童中山 周辉 +2 位作者 吴时强 陈文伟 卢新杰 《水利水运工程学报》 CSCD 北大核心 2002年第1期73-78,共6页
介绍了水电站漂浮物的种类及特性 ,导漂建筑物所受荷载、运动状态 。
关键词 漂浮物 导漂建筑物 水电站 数学模型试验 物理模型
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海港锚地使用环境条件标准研究 被引量:1
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作者 谷文强 谢华东 覃杰 《中国港湾建设》 2020年第7期6-9,共4页
针对海港锚地使用环境条件标准问题,通过国内外海港锚地的调研分析、国内外规范对比分析和数学模型试验进行综合研究,数学模型试验采用Fast-time模型,研究风、浪和流作用下的锚泊船舶的走锚情况,试验中将调研分析成果和国内外规范相关... 针对海港锚地使用环境条件标准问题,通过国内外海港锚地的调研分析、国内外规范对比分析和数学模型试验进行综合研究,数学模型试验采用Fast-time模型,研究风、浪和流作用下的锚泊船舶的走锚情况,试验中将调研分析成果和国内外规范相关规定的海港锚地使用环境标准条件作为输入参数进行试验,得出不同类型锚地、不同的锚链和水深比值条件下的使用环境条件标准,相关研究方法和结论可为海港锚地设计项目提供参考。 展开更多
关键词 海港 锚地 环境条件 数学模型试验
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潍坊寿光港区航道工程防沙堤平面布置形式研究
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作者 秦福寿 杨泽君 +2 位作者 侯志强 刘涛 李姗 《水道港口》 2014年第2期141-147,170,共8页
采用波浪潮流泥沙数学模型试验手段,对潍坊寿光港区防沙堤建设中的平面布置形式进行研究。根据研究成果,建议选择北槽航道作为5000t级通海航道,航道走向63.5°-243.5°。防沙堤工程建议采用双导堤形式,其中北导堤应接岸... 采用波浪潮流泥沙数学模型试验手段,对潍坊寿光港区防沙堤建设中的平面布置形式进行研究。根据研究成果,建议选择北槽航道作为5000t级通海航道,航道走向63.5°-243.5°。防沙堤工程建议采用双导堤形式,其中北导堤应接岸。建议堤头可先达-4.0m水深处,观测其堤头附近冲淤变化后,再决定是否继续向海延伸。 展开更多
关键词 数学模型试验 防沙堤 平面布置 航道横流 航道淤积
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海南清水湾游艇码头防波堤平面布置 被引量:3
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作者 周军 蔡小红 胡东 《水运工程》 北大核心 2011年第B09期87-92,共6页
按照游艇泊位波浪掩护的高标准要求,对海南清水湾旅游度假区游艇码头防波堤平面布置特别是口门布置进行了探讨,并利用数学模型试验对港内泊稳、口门内外冲淤变化、流态变化、岸滩演变等进行模拟验证,总结了在砂质海岸建设游艇码头防波... 按照游艇泊位波浪掩护的高标准要求,对海南清水湾旅游度假区游艇码头防波堤平面布置特别是口门布置进行了探讨,并利用数学模型试验对港内泊稳、口门内外冲淤变化、流态变化、岸滩演变等进行模拟验证,总结了在砂质海岸建设游艇码头防波堤的经验,供类似工程参考。 展开更多
关键词 防波堤 口门 波浪掩护 泥沙淤积 岸滩演变 数学模型试验
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黄骅港综合港区单、双堤延伸防沙堤方案减淤效果分析 被引量:3
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作者 张文杰 《水道港口》 2016年第3期247-254,共8页
在分析工程海区水沙条件基础上,通过数学模型试验的方法对黄骅港综合港区单、双堤延伸防沙堤方案减淤效果进行研究,论证了单堤延伸防沙堤的合理性、可行性,单独延伸综合港区北防沙堤至-8 m等深线位置能够起到较好的减淤效果,先期单堤延... 在分析工程海区水沙条件基础上,通过数学模型试验的方法对黄骅港综合港区单、双堤延伸防沙堤方案减淤效果进行研究,论证了单堤延伸防沙堤的合理性、可行性,单独延伸综合港区北防沙堤至-8 m等深线位置能够起到较好的减淤效果,先期单堤延伸防沙堤不失为一种好的起步方式。 展开更多
关键词 数学模型试验 单堤 双堤 减淤效果
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航塘港泵闸水利枢纽总体布置研究 被引量:4
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作者 潘源 沈小立 《城市道桥与防洪》 2019年第12期79-82,90,M0009,M0010,共7页
航塘港泵闸是上海浦东片的重要排涝泵闸,主要功能是除涝、防潮、兼顾水资源调度,并与杭州湾海塘共同形成防洪(潮)封闭圈。为保证航塘港泵闸工程的安全运行,拟通过数学模型试验及水工模型试验验证泵闸平面布置和消能防冲设施结构,测试水... 航塘港泵闸是上海浦东片的重要排涝泵闸,主要功能是除涝、防潮、兼顾水资源调度,并与杭州湾海塘共同形成防洪(潮)封闭圈。为保证航塘港泵闸工程的安全运行,拟通过数学模型试验及水工模型试验验证泵闸平面布置和消能防冲设施结构,测试水闸过流能力、泵闸进出水流态及流速分布,分析泵闸运行对杭州湾海域、两侧现状滩面及内河侧河道的影响。 展开更多
关键词 航塘港泵闸 总体布置 数学模型试验 水工模型试验 流态 垂线平均流速
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某港口城项目季风期水工结构防护方案分析 被引量:1
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作者 徐杰 黄远明 《广东土木与建筑》 2020年第6期73-75,共3页
介绍了某港口城项目季风期水工结构防护方案,通过理论计算,并结合施工期波浪数学模型试验结果,探讨分析了在季风期长周期波浪影响下,无遮掩海域水工结构的临时防护方案,可供类似工程提供参考。
关键词 季风期 水工结构 防波堤 临时防护 长周期波 波浪数学模型试验
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Application of Mean-Field Jordan-Wigner Transformation to Antiferromagnet System 被引量:1
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作者 LI Jia-Liang LEI Shu-Guo JIANG Yu-Chi 《Communications in Theoretical Physics》 SCIE CAS CSCD 2008年第7期243-247,共5页
By using the mean-field Jordan-Wigner transformation analysis,this paper studies the one-dimensionalspin-1/2 XYZ antiferromagnetic chain in the transverse field with uniform long-range interactions among the z-compone... By using the mean-field Jordan-Wigner transformation analysis,this paper studies the one-dimensionalspin-1/2 XYZ antiferromagnetic chain in the transverse field with uniform long-range interactions among the z-components of the spins.The thermodynamic quantities,such as Helmholtz free energy,the internal energy,the specificheat,and the isothermal susceptibility,are obtained.Under degenerating condition,our results agree with numericalresults of the other literatures. 展开更多
关键词 XYZ antiferromagnetic chain mean-field Jordan-Wigner transformation long-range interactions
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Deformation Behavior of Hot Isostatic Pressing FGH96 Superalloy 被引量:2
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作者 刘玉红 李付国 喻宏波 《Transactions of Tianjin University》 EI CAS 2006年第4期281-285,共5页
The deformation behavior of hot isostatic pressing (HIP) FGH96 superalloy was characterized in the temperature range of 1000-1100 ℃ and strain rate range of 0. 001-0. 1 s^-1 using hot compression testing. The flow ... The deformation behavior of hot isostatic pressing (HIP) FGH96 superalloy was characterized in the temperature range of 1000-1100 ℃ and strain rate range of 0. 001-0. 1 s^-1 using hot compression testing. The flow curves of HIP FGH96, superalloy during hot deformation was analyzed systematically. The results show that deformation temperature, strain rate and strain are the main influence factors on flow stress of HIP FGH96 superalloy during hot deformation. The flow stress displays a peak at a critical strain and then decreases with further increase in strain. For a given strain, the flow stress decreases with the increase of deformation temperature, and increases with the increase of strain rate. A mathematical model of these flow curves was established through regression analysis and taking the strain as a modification factor. The calculated stress values agree well with the experimental values. 展开更多
关键词 powder metallurgical superalloy hot isostatic pressing compression testing mathematical model regression analysis
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Model Test and Numerical Analysis on Long-Term Mechanical Properties of Stepped Reinforced Retaining Wall 被引量:5
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作者 WANG Chengzhi LUAN Maotian ZHU Zeqi 《Transactions of Tianjin University》 EI CAS 2012年第1期62-68,共7页
Model tests and numerical analyses of stepped reinforced retaining wall were performed to investigate the effects of rheology of backfill and creep of geogrids on the long-term performance of the structure.The geogrid... Model tests and numerical analyses of stepped reinforced retaining wall were performed to investigate the effects of rheology of backfill and creep of geogrids on the long-term performance of the structure.The geogrid tensions,soil pressures,wall deformations and foundation pressure were measured during model construction and loading.A visco-elasto-plastic model and an empirical nonlinear visco-elastic model were utilized to simulate the stresses and deformations of geogrid-reinforced earth-retaining wall under long-term loads.By comparing test data with numerical results,it is shown that the foundation pressure distribution is nonlinear,and the lateral constraint of geogrids for backfill can cause a redistribution of foundation pressure.The curve of soil pressure is outside convex at each step initially,and it is close to the distribution for the case of vertical wall subsequently.The variation trend of geogrid tensions at different heights is obtained.Moreover,the failure mechanism and development mode of potential slip surface in retaining wall are proposed. 展开更多
关键词 model test GEOGRID stepped reintbrced retaining wall finite element method visco-elasto-plasticity model
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Dynamic behaviors of pretensioned cable AERORail structure
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作者 李方元 吴培峰 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第6期2267-2276,共10页
The AERORail, a new aerial transport platform, was chosen as the object of this work. Following a review of the literature on static behaviors, model tests on the basic dynamic mechanical characteristics were conducte... The AERORail, a new aerial transport platform, was chosen as the object of this work. Following a review of the literature on static behaviors, model tests on the basic dynamic mechanical characteristics were conducted. A series of 90 tests were completed with different factors, including tension force, vehicle load and vehicle speed. With regard to the proper tension and vehicle load, at a certain speed range, the tension increments of the rail's cable were proved relatively small. It can be assumed that the change of tension is small and can be reasonably ignored when the tension of an entire span is under a dynamic load. When the tension reaches a certain range, the calculation of the cable track structure using classical cable theory is acceptable. The tests prove that the average maximum dynamic amplification factor of the deflection is small, generally no more than 1.2. However, when the vehicle speed reaches a certain value, the amplified factor will reach 2.0. If the moving loads increase, the dynamic amplification factor of dynamic deflection will also increase. The tension will change the rigidity of the structure and the vibration frequency; furthermore, the resonance speed will change at a certain tension. The vibration is noticeable when vehicles pass through at the resonance speed, and this negative impact on driving comfort requires the right velocity to avoid the resonance. The results demonstrate that more design details are required for the AERORail structure. 展开更多
关键词 pretensioned cable AERORail structure dynamic bchavior model test vibration characteristic dynamic amplification factor influence line
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Evaluating the safety of high arch dams with fractures based on numerical simulation and geomechanical model testing 被引量:3
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作者 HE Zhu LIU YaoRu +1 位作者 PAN YuanWei YANG Qiang 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2015年第10期1648-1659,共12页
It is important to estimate the probability of fracture extension and its impact on the safety of arch dams with fractures. Numerical simulation and geomechanical model test were combined to evaluate the overall stabi... It is important to estimate the probability of fracture extension and its impact on the safety of arch dams with fractures. Numerical simulation and geomechanical model test were combined to evaluate the overall stability and the extension probability of fractures. Numerical simulation forecasted the dam displacement and the operating behavior based on the parameters obtained from the back analysis. Geomechanical model test was based on small block masonry and the models with or without fractures were both tested. The results show that the deformation of dams is in line with general rules at a normal water load and the extension probability of the existing fractures is very small, which has no significant impact on the global stability of dams. Moreover, the failure process of arch dams with the existing fractures in dams at overload scenarios is similar to the one without the embedded fractures, i.e., the failure crack which is not caused by the existing fractures inside comes into being on the surface of dams itself. 展开更多
关键词 numerical simulation geomechanical model test safety evaluation arch dams FRACTURES
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Control Valve with a Constant Inner Authority Value 被引量:1
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作者 MUNIAK Damian Piotr 《Journal of Thermal Science》 SCIE EI CAS CSCD 2018年第5期487-495,共9页
The aim of the article is to propose the method of designing double regulation control valves used in heating installations, allowing to obtain a constant value of the so-called inner authority and thus the constancy ... The aim of the article is to propose the method of designing double regulation control valves used in heating installations, allowing to obtain a constant value of the so-called inner authority and thus the constancy of the valve control characteristic, regardless of the pre-setting value set on the valve. The shape of the valve's regulation characteristics is one of the main factors determining the quality of the quantitative regulation, and thus the stability of the system's operation and overall operating costs. For this reason, the issue discussed in the article is important and can be applied in practical implementations of the valve sizing and the valve selection. The analysis was based on the relations binding the hydraulic resistances occurring inside the control valve, and the corresponding flow factors, using original author's proposal. The experimental verification was performed on a special measuring stand prepared for this purpose, measuring the values of the medium volume flow at a constant differential pressure, and then the results were converted into values of the flow factor, used in the proposed mathematical model. The results confirm the thesis put forward and the proposed mathematical model. High convergence of the results of experimental verification with the proposed mathematical model was obtained. 展开更多
关键词 control valve valve AUTHORITY pre-setting heating installation hydraulic balancing
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