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21.
强度和变形参数的变化对土工有限元计算的影响 总被引:4,自引:2,他引:4
在土工问题的数值分析中,包含变形模量E、泊松比 两个变形参数的增量线弹性模型是一种常用的计算模型,研究和掌握E和 两个参数对土工有限元计算的影响有助于分析计算成果。首先,设想固定某一个参数而观察另一个参数变化对计算结果的影响;然后,说明用强度折减有限元法分析土坡稳定安全系数时,实际上已同时考虑了变形参数的影响。可采用剪应力? xy的等值线近似形成滑动面,滑动面单元的应力水平S等于1和特征点的位移发生突变共同作为失稳判据;最后,是用强度参数为纽带探讨这两个变形参数的互相变化关系,即E愈大,则土的强度愈大,? 愈小。 相似文献
22.
A number of studies have revealed that the climate in the eastern margin of the Tibetan Plateau and Northeast China is sensitive
to postglacial changes. Unfortunately, the link of the past climate evolution between the two regions is not well understood.
In this study, two cores are analyzed to determine this link directly. The high-resolution n-alkanol distribution patterns from two typical peat sequences covering the past 16,000 cal years in the northeastern margin
of the Tibetan Plateau and Northeast China, respectively, are closely examined by gas chromatograph–mass spectrometry analysis.
In combination with other palaeoclimatic proxies, it is proposed that the n-alkanol average chain length and (C22 + C24)/(C26 + C28) ratio could reflect past climate changes in the two peat sequences. The n-alkanol proxies reveal several climatic intervals in the period from the last deglaciation through the Holocene. A comparison
of n-alkanol records between the northeastern margin of the Tibetan Plateau and Northeast China indicates that the start and end
of the warm Holocene Optimum differed at the two locations. The spatially asynchronous pattern of climatic change is possibly
a result of different responses to change in solar radiation. The evolution of the Holocene paleoclimate is more consistent
with changes in Northern Hemisphere solar radiation in Northeast China than on the Tibetan Plateau. The Holocene Optimum began
and terminated earlier in Northeast China than in the northeastern margin of the Tibetan Plateau. Thus, the two n-alkanol proxies provide valuable insights into the regional Holocene climate and local environmental conditions. 相似文献
23.
Design of a hydraulic power take-off system for the wave energy device with an inverse pendulum 总被引:1,自引:0,他引:1
This paper describes a dual-stroke acting hydraulic power take-off (PTO) system employed in the wave energy converter (WEC) with an inverse pendulum. The hydraulic PTO converts slow irregular reciprocating wave motions to relatively smooth, fast rotation of an electrical generator. The design of the hydraulic PTO system and its control are critical to maximize the generated power. A time domain simulation study and the laboratory experiment of the full-scale beach test are presented. The results of the simulation and laboratory experiments including their comparison at full-scale are also presented, which have validated the rationality of the design and the reliability of some key components of the prototype of the WEC with an inverse pendulum with the dual-stroke acting hydraulic PTO system. 相似文献
24.
Yu-Xin Fan Fa-Hu Chen Guo-Xiao Wei David B. Madsen Charles G. Oviatt Hui Zhao Xi Chun Li-Ping Yang Tian-Lai Fan Guo-Qiang Li 《Journal of Paleolimnology》2010,43(3):577-587
Lake Jilantai-Hetao, a megalake, was formed some time before 60–50 ka, along the Great North Bend of the Yellow River. The
basin is now dry, with most of the area covered by aeolian sand. We are investigating this profound hydrologic change using
a number of research approaches. Paleoshorelines of this megalake are best preserved in the Jilantai area in the southwestern
portion of the megalake basin. We collected aquatic mollusk shells from littoral sediments at different altitudes around Jilantai
and measured their strontium isotope compositions. 87Sr/86Sr ratios in shell carbonates are different between the high lake phase (~1,080–1,050 m altitude) and the low lake phase (~1,044–1,030 m
altitude), with a small shift in average strontium ratios to more radiogenic values during the low lake phase. Based on regional
hydrology and physical geography, we conclude that water from the Yellow River was the dominant water source supplying this
megalake. 87Sr/86Sr ratios of modern water samples suggest the Yellow River was the dominant water source during the high lake phase, but that
the relative contribution of Yellow River water to the megalake was reduced, and that the relative contributions of local
precipitation and groundwater increased, during the low lake phase. 相似文献
25.
2001年昆仑山口西8.1级地震地表破裂带 总被引:30,自引:8,他引:30
2001年11月14日昆仑山口西8.1级地震是近50年来在我国大陆发生的震级最大、地表破裂最长的地震事件.地震地表破裂带全长426km,宽数米至数百米,总体走向90°~110°,具有明显的破裂分段特征,自西向东由5条次级破裂段组成.各破裂段又由若干更次级左阶或右阶斜列的破裂组成,具有自相似的分形结构特征.地震破裂带以左旋走滑为主,倾滑量很小.宏观震中区位于库赛湖东北93.0°~93.5°E一带的昆仑山南麓断层谷地内.最大地表同震左旋水平位移6.4m,最大垂直位移为4m.地表水平位移沿地震破裂带走向出现6个峰值,各峰值之间存在相对独立的衰减序列,这表明此地震具有多点破裂特征. 相似文献
26.
27.
Ultrasound-assisted solvent extraction was confirmed as a novel,effective method for separating lipid from mackerel pro-tein,resulting in a degreasing rate (DR) of 95% and a nitrogen recovery (NR) of 88.6%.To obtain protein hydrolysates with high ni-trogen recovery and low bitter taste,enzymatic hydrolysis was performed using eight commercially available proteases.It turned out that the optimum enzyme was the ‘Mixed enzymes for animal proteolysis’.An enzyme dosage of 4%,a temperature of 50℃,and a hydrolysis time of 300 min were found to be the optimum conditions to obtain high NR (84.28%) and degree of hydrolysis (DH,16.18%) by orthogonal experiments.Glutamic acid was the most abundant amino acid of MDP (defatted mackerel protein) and MDPH (defatted mackerel protein hydrolysates).Compared with the FAO/WHO reference protein,the essential amino acid chemical scores (CS) were greater than 1.0 (1.0 1.7) in MDPH,which is reflective of high nutritional value.This,coupled with the light color and slight fishy odor,indicates that MDPH would potentially have a wide range of applications such as nutritional additives,functional ingredients,and so on. 相似文献
28.
历次核试验进入海洋的~(137)Cs对中国近海影响的模拟研究 总被引:1,自引:0,他引:1
1945年以来,世界各主要核国家进行了数千次核试验,这些核试验产生的绝大部分放射性物质通过多种途径进入海洋,对海洋环境造成放射性污染。本文建立了一个准全球海洋的放射性物质输运和扩散数值模式,通过数值模拟手段评估了历史核试验释放的放射性物质137 Cs对中国近海海洋环境的影响。本文借助前人工作评估了核试验释放137Cs进入海洋的途径和总量;通过比较模拟结果与观测资料,表明本文建立的放射性物质模式能够较好地模拟出137Cs在中国近海及其邻近海域的分布情况和随时间演变特征;模拟结果表明中国近海里的137Cs浓度在20世纪50年代中期达到最大,其中吕宋海峡海域137Cs浓度最高,达80.99Bq/m3;进一步分析了2011年3月份日本福岛核事故前中国近海137Cs浓度分布状况,2011年整个中国近海137Cs浓度介于1.0~1.6Bq/m3间,且其浓度垂向分布较均匀,相对封闭的南海浓度略高于其他海域。 相似文献
29.
30.
结合地震地球物理观测台网台站监测工作实际,研制一款地震观测仪器自动监控软件。该软件适用于不同网络环境下IP类仪器设备的网络实时或定时自动监控,地球物理观测类仪器时钟、状态和观测数据的定时自动监控,能自动识别当日观测数据中的无效数据、变幅异常、干扰、地震和限幅等信息,无需借助其他硬件和软件即可将告警信息以短信方式发送给值班人员和管理人员,可实现对仪器原始观测数据的自动备份和手动恢复,及对仪器的一键重启和校正时钟等控制类操作,无需跨平台操作即可查看当日观测数据曲线及分析数据的完整性和有效性,从而实现对仪器的统一高效管理。 相似文献