|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Mechanical properties and corrosion behavior of selective laser melted 316L stainless steel after different heat treatment processes显示文摘Irregular grains, high interfacial stresses and anisotropic properties widely exist in 3D-printed metallic materials, and this paper investigated the effects of heat treatment on the microstructural, mechanical and corrosion properties of 316 L stainless steel fabricated by selective laser melting. Sub-grains and low-angle boundaries exist in the as-received selective laser melted(SLMed) 316 L stainless steel. After heat treatment at 1050℃, the sub-grains and low-angle boundaries changed slightly, and the stress state and strength decreased to some extent due to the decrease of dislocation density. After heat treatment at 1200℃, the grains became uniform, and the dislocation cells vanished, which led to a sharp decline in the hardness and strength. However, the ductility was improved after recrystallization heat treatment.The passive film thickness and corrosion potential of the SLMed 316 L stainless steel decreased after heat treatment, and the pitting potential also decreased due to the accelerated transition from metastable to steady-state pitting;this accelerated transition was caused by the presence of weak passive films at the enlarged pores after heat treatment, especially for an adequate solid solution treatment. | Decheng Kong Chaofang Dong Xiaoqing Ni Liang Zhang Jizheng Yao Cheng Man Xuequn Cheng Kui Xiao Xiaogang Li | 2019 | Journal of Materials Science & Technology2019，35，7： | 23 |
| 2 | Modeling spatio-temporal distribution of soil moisture by deep learning-based cellular automata model显示文摘Soil moisture content (SMC) is a key hydrological parameter in agriculture,meteorology and climate change,and understanding of spatio-temporal distributions of SMC in farmlands is important to address the precise irrigation scheduling.However,the hybrid interaction of static and dynamic environmental parameters makes it particularly difficult to accurately and reliably model the distribution of SMC.At present,deep learning wins numerous contests in machine learning and hence deep belief network (DBN) ,a breakthrough in deep learning is trained to extract the transition functions for the simulation of the cell state changes.In this study,we used a novel macroscopic cellular automata (MCA) model by combining DBN to predict the SMC over an irrigated corn field (an area of 22 km^2) in the Zhangye oasis,Northwest China.Static and dynamic environmental variables were prepared with regard to the complex hydrological processes.The widely used neural network,multi-layer perceptron (MLP) ,was utilized for comparison to DBN.The hybrid models (MLP-MCA and DBN-MCA) were calibrated and validated on SMC data within four months,i.e.June to September 2012,which were automatically observed by a wireless sensor network (WSN) .Compared with MLP-MCA,the DBN-MCA model led to a decrease in root mean squared error (RMSE) by 18%.Thus,the differences of prediction errors increased due to the propagating errors of variables,difficulties of knowing soil properties and recording irrigation amount in practice.The sequential Gaussian simulation (s Gs) was performed to assess the uncertainty of soil moisture estimations.Calculated with a threshold of SMC for each grid cell,the local uncertainty of simulated results in the post processing suggested that the probability of SMC less than 25% will be difference in different areas at different time periods.The current results showed that the DBN-MCA model performs better than the MLP-MCA model,and the DBN-MCA model provides a powerful tool for predicting SMC in highly non-linear forms.Moreover,because modeling soil moisture by using environmental variables is gaining increasing popularity,DBN techniques could contribute a lot to enhancing the calibration of MCA-based SMC estimations and hence provide an alternative approach for SMC monitoring in irrigation systems on the basis of canals. | SONG Xiaodong ZHANG Ganlin LIU Feng LI Decheng ZHAO Yuguo YANG Jinling | 2016 | Journal of Arid Land2016，8，5： | 20 |
| 3 | Soil Erosion Changes over the Past Five Decades in the Red Soil Region of Southern China显示文摘This paper reports the dynamic changes of soil and water loss in the red soil region of Southern China since the 1950s. The red soil region covers eight provinces: Jiangxi, Zhejiang, Fujian, Anhui, Hubei, Hunan, Guangdong and Hainan. From the 1950s to 1986, the annual rate of soil erosion increased by 3.4%. From 1986 to 1996 and from 1996 to 2000, the annual rates of soil erosion decreased by 2.0% and 0.32%, respectively. Field surveys showed that from 2000 to 2005, the area of soil and water loss decreased annually by 1.2%. This decrease was a result of large-scale erosion control activities across China. Although the eroded soil has been restored, the restoration process is very slow and full restoration will take a long time. Our report suggests that controlling soil and water loss is a challenging task, and additional measures must be taken to effectively control the soil erosion in the red soil region. | LIANG Yin LI Decheng LU Xixi YANG Xuan PAN Xianzhang MU Huan SHI Deming ZHANG Bin | 2010 | Journal of Mountain Science2010，7，1： | 18 |
| 4 | Numerical Prediction of Added Resistance and Vertical Ship Motions in Regular Head Waves显示文摘增加的抵抗和垂直轮船的数字预言一 ITTC (国际拖引坦克会议) 打手势在由我们的自己的内部地不稳定的 RANS 解答者 naoe-FOAM-SJTU 的常规头波浪的 S-175 货柜船在这篇论文被介绍。解答者 naoe-FOAM-SJTU 的发展基于开放源代码 CFD 工具, OpenFOAM。数字分析在常规头波浪与四很不同的波长(0.8L pp 1.5L pp ) 集中于增加的抵抗和垂直轮船运动(举和沥青运动) 。一旦波长在轮船模型的长度附近,抵抗和轮船运动的回答变得强烈由非线性的因素影响了,作为结果在模拟以内的困难发生。在纸,试验性的结果和非线性的长带理论的比较被考察并且基于调查结果,由解答者 naoe-FOAM-SJTU 的 RANS 模拟在大量波长与增加的抵抗和垂直轮船运动的预言被认为能干。 | Haixuan Ye Zhirong Shen Decheng Wan | 2012 | Journal of Marine Science and Application2012，11，4： | 16 |
| 5 | Numerical Simulation of Wind Turbine Blade-Tower Interaction显示文摘由使用开放源代码 OpenFOAM 工具的风汽轮机片塔相互作用的数字模拟结合了任意的网孔接口(AMI ) 方法被介绍。管理方程是被 pimpleDyMFoam 解答者解决的不稳定的平均 Reynolds 的海军司烧(RANS ) ,并且 AMI 方法被采用处理网孔运动。在迎风的配置的国家可更新的精力实验室(NREL ) 阶段 VI 风汽轮机在固定的片程度和经常的旋转速度以不同的到来的风速度(5, 10, 15,和 25 m/s ) 为数字测试被选择。旋涡结构,戳的时间历史,和片和塔上的压力分发的详细数字结果被介绍。风汽轮机塔举办的调查结果表演一台迎风的风汽轮机的整个空气动力学的表演上的小效果,当旋转转子将在前面导致明显的周期的落下时,塔迫使。另外,有从塔的分离的片尖端旋涡的强壮的相互作用被观察。 | Qiang Wang Hu Zhou Decheng Wan | 2012 | Journal of Marine Science and Application2012，11，3： | 15 |
| 6 | Progress in the stratigraphy and geochronology of the Shuidonggou site,Ningxia,North China显示文摘In the past years we carried out further stratigraphy division in field and it is found that rich stone artifacts can be found in fluvial-shallow lake-alluvial sediments on the terrace Ⅱ of Biangou River, in Shuidonggou site, Ningxia and they are SDG1, 2 and 7. More luminescence and AMS 14C dating in laboratory show that Paleolithic culture develops during the Upper Paleolithic period with ages of 35―20 ka. The Paleolithic culture of SDG 1 is a little earlier than that of SDG 2 similar to SDG 7. The sandy sediments on terrace Ⅱ of Biangou River deposits in the past 72―18 ka, corresponding to Last Glacial. SDG2 has a stable sedimentary environment, resulting in the continuous stratigraphy, thickest deposits and rich environment and culture information, which can be regarded as the important and classic paleoanthropological section of Late Pleistocene in this region. | LIU DeCheng WANG XuLong GAO Xing XIA ZhengKai PEI ShuWen CHEN FuYou WANG HuiMing | 2009 | Chinese Science Bulletin2009，54，21： | 13 |
| 7 | CFD Investigations of Ship Maneuvering in Waves Using naoe-FOAM-SJTU Solver显示文摘Ship maneuvering in waves includes the performance of ship resistance, seakeeping, propulsion, and maneuverability. It is a complex hydrodynamic problem with the interaction of many factors. With the purpose of directly predicting the behavior of ship maneuvering in waves, a CFD solver named naoe-FOAM-SJTU is developed by the Computational Marine Hydrodynamics Lab(CMHL) in Shanghai Jiao Tong University. The solver is based on open source platform OpenFOAM and has introduced dynamic overset grid technology to handle complex ship hull-propeller-rudder motion system. Maneuvering control module based on feedback control mechanism is also developed to accurately simulate corresponding motion behavior of free running ship maneuver. Inlet boundary wavemaker and relaxation zone technique is used to generate desired waves. Based on the developed modules, unsteady Reynolds-averaged Navier-Stokes(RANS) computations are carried out for several validation cases of free running ship maneuver in waves including zigzag, turning circle, and course keeping maneuvers. The simulation results are compared with available benchmark data. Ship motions, trajectories, and other maneuvering parameters are consistent with available experimental data, which indicate that the present solver can be suitable and reliable in predicting the performance of ship maneuvering in waves. Flow visualizations, such as free surface elevation, wake flow, vortical structures, are presented to explain the hydrodynamic performance of ship maneuvering in waves. Large flow separation can be observed around propellers and rudders. It is concluded that RANS approach is not accurate enough for predicting ship maneuvering in waves with large flow separations and detached eddy simulation(DES) or large eddy simulation(LES) computations are required to improve the prediction accuracy. | Jianhua Wang Decheng Wan | 2018 | Journal of Marine Science and Application2018，17，3： | 12 |
| 8 | An engraved artifact from Shuidonggou,an Early Late Paleolithic Site in Northwest China显示文摘Cognition and symbolic thinking are viewed as important features of modern human behavior.Engraved objects are seen as a hallmark of cognition and symbolism,and even as evidence for language.Accumulated evidences including engraved bones,ochre,ostrich eggshells and stone artifacts were unearthed from Africa,Europe,Levant even Siberia Paleolithic sites.But the archaeological evidence for this,including beads,ornaments,burials,performed objects and engraved objects,is rarely discovered in the Pleistocene of East Asia.The present paper reports an engraved stone object unearthed in the Early Late Paleolithic levels about 30 ka BP at the Shuidonggou site(SDG) in northwestern China.It was unearthed in the 1980's excavation from Lower culture unit of SDG1 but was identified in 2011 when the first author of this article observed the collection from the 1980's excavations stored in the Institute of Archaeology of Ningxia Hui Autonomous Region for further detailed lithic analysis.This lithic artifact is the first engraved non-organic object of the Paleolithic period found in China.In order to clarify the details of the incisions and to document the human intentional modifications,we used a KEYENCE VHX-600 Digital Microscope to measure and observe all the incisions in 3-dimensional perspective.Comparing the natural cracks and analyzing many details of the incisions,we argue that incisions on this stone artifact are the result of intentional behaviors by ancient humans.Also,we exclude the possible other causes including animal-induced damages,post-depositional phenomenon and unintentional by-products.Combining all these features,we suggest that the incisions were made by an intentional behavior and were probably of a non-utilitarian character.Because the nature of most other engraved objects in China is debate,we cannot get a clear scenario of the emergence and progress of modern human behavior in North China.But we infer the possible existence of a counting or recording system,or other symbolic behaviors,which reflect considerably evolved cognitive capacities or modern human behavior in the Early Late Paleolithic of East Asia. | PENG Fei GAO Xing WANG HuiMin CHEN FuYou LIU DeCheng PEI ShuWen | 2012 | Chinese Science Bulletin2012，57，35： | 8 |
| 9 | Magnetic properties and large magnetocaloric effects in amorphous Gd-Al-Fe alloys for magnetic refrigeration显示文摘A series of the amorphous Gd75-55Al25-5Fe0-40 alloy ribbons were prepared by melt spinning.The structure,magnetic properties and magnetocaloric effect(MCE) of these alloys were investigated.The prepared samples have shown the characteristics of a second-order phase transition with zero hysteresis loss and the Tc can be tuned by changing the Fe contents.For the different compositions,the magnetic entropy change(--Sm) for a field change of 0-5 T reached a maximum value of 7.14 J kg-1 K-1 in the Gd70Al20Fe10 alloy near its Curie temperature(Tc) of 149 K.The non-linear composition dependence of(-ΔSm) could be caused by the competitions between Fe-Fe,Fe-Gd and Gd-Gd interactions.The refrigeration capacity(RC) values of these alloys are about 532-780 J/kg under a magnetic field change of 0-5 T.The results indicate that amorphous GdFeAl alloys can be considered as ideal candidates for a magnetic refrigerant in the temperature range of 104-222 K. | ZHENG ZhiGang ZHONG XiChun SU KunPeng YU HongYa LIU ZhongWu ZENG DeCheng | 2011 | Science China(Physics,Mechanics & Astronomy)2011，54，7： | 8 |
| 10 | Numerical Simulation of Motion Response of an Offshore Observation Platform in Waves显示文摘近海当他们在海正在操作时,观察平台被要求有极有能力抵抗波浪。在海的平台的运动特征上的调查能在平台设计过程期间提供重要引用值。在这份报纸,相互作用上的一系列数字模拟一三倍壳近海有不同事件波浪的观察站台被执行。所有模拟被实现利用我们的自己的解答者 naoe-FOAM-SJTU,它基于并且发展 OpenFOAM 的开放源代码工具。对站台起作用的运动特征和负担的持续时间曲线被获得,并且在在不同事件波浪的振幅的结果之间的比较被介绍。结果证明解答者在在波浪的平台的运动反应的模拟是能干的。 | Yuanchuan Liu Decheng Wan | 2013 | Journal of Marine Science and Application2013，12，1： | 8 |
| 11 | Preliminary study on the living environment of hominids at the Donggutuo site,Nihewan Basin显示文摘The Donggutuo site, situated in the east margin of Nihewan basin, is one of the most important Paleolithic sites in China, characterized by the longest excavation seasons and the most abundant cultural remains recovered in the region. Based on well-constructed sporopollen, sediment grain size analysis, magnetic susceptibility, and iron oxide analysis of the 2000―2001 excavated section, four stages of environmental change in the Nihewan Beds are identified by the authors. The results indicate four major stages of environment and climate change from 1) warm and humid forest grass to 2) temperate and humid forest grass to 3) temperate and dry forest grass to 4) warm and humid forest, which is suitable for hominid occupation. The changes correspond to the stages of lake transgression and regression. The environment after the lake died out away has been cold and dry boschveld. The hominid activities at the site took place in the Early Pleistocene (1.10 Ma), which corresponds to the early three environmental stages. Therefore, it can be inferred that the early hominids adapted to the relatively low lake level episodes through activities involving sporadic stone tool making, procuring of raw materials for tools, concentrating stone artifacts, and hunting and butchering. In conclusion, the results will be of great significance to research regarding the relationship between hominid occupation and environmental changes as well as the adaptive behaviors of early humans at the Donggutuo site. | PEI ShuWen LI XiaoLi LIU DeCheng MA Ning PENG Fei | 2009 | Chinese Science Bulletin2009，54，21： | 7 |
| 12 | Numerical Investigations on the Aerodynamic Performance of Wind Turbine: Downwind Versus Upwind Configuration显示文摘尽管迎风的配置在风精力的领域里是更流行的,顺风的是一种有希望的类型为近海由于它的特殊优点弯屈精力。不同配置有不同空气动力学的性能和它是重要的为设计并且发展中更可靠的风汽轮机精确地预言顺风、迎风的配置的表演。在这份报纸,在顺风、迎风的配置的国家可更新的精力实验室(NREL ) 阶段 VI 风汽轮机的空气动力学的表演上的数字调查被介绍。结合的开放源代码工具箱 OpenFOAM 任意的网孔接口(AMI ) 方法被使用处理风汽轮机的旋转问题。NREL 阶段 VI 的数字模型弯屈的二 3D 有在到来的风速度的四个典型工作条件下面的顺风、迎风的配置的汽轮机分别地为顺风、迎风的配置的不同不稳定的特征的学习被建立。数字结果弄醒旋涡结构,戳的时间历史,片上的压力分发并且限制优化哪个能被用来鉴别在 3D 流动的分离的点被介绍。戳减小为迎风的风汽轮机,但是相对由于片塔相互作用是小的,这能被结束为汽轮机和注意应该在周期的减小为两种配置导致的某个频率被付到颤动的顺风的风大。结果和结论是有用的分析在顺风、迎风的配置之间的风汽轮机的不同空气动力学的表演,提供为风汽轮机的实际设计的有用参考书。 | Hu Zhou | 2015 | Journal of Marine Science and Application2015，14，1： | 7 |
| 13 | Neuroprotective effects of the immunodepressant FTY720 on caspase-3 expression and neural apoptosis in a rat model of acute spinal cord injury显示文摘BACKGROUND:Studies on the immunodepressant FTY720 have primarily focused on organ transplantation and autoimmune disease therapy.However,the effects on caspase-3 expression and neural apoptosis following acute spinal cord injury remain uncertain.OBJECTIVE:To elucidate the underlying mechanism of the immunodepressant FTY720 to alleviate spinal cord injury by inhibiting expression of caspase-3 and neural apoptosis.DESIGN,TIME AND SETTING:A randomized,controlled,animal experiment was performed at Central Laboratory of the Second Affiliated Hospital of Dalian Medical University from April to July 2009.MATERIALS:FTY720 was provided by Wuhan Yuancheng Technology Developing,China.METHODS:A total of 120 Sprague Dawley rats were randomly assigned to sham-surgery,model,and FTY720 groups.Spinal cord injury at the T9-10 segment was induced in model groups using the free-fall method.Following establishment of spinal cord injury at the T9-10 segment in the FTY720 group,rats were treated with an intragastric injection of 0.3 mL saline-diluted FTY720 (3 mg/kg).MAIN OUTCOME MEASURES:At 6,12,24,48,and 72 hours following spinal cord injury,caspase-3 expression was detected using streptavidin-peroxidase immunohistochemistry,and neural apoptosis was detected using the TUNEL method.RESULTS:Positive caspase-3 expression and neural apoptosis was not observed in the sham-surgery group at the various time points.The number of apoptotic cells increased with time after acute spinal cord injury,peaked at 24 hours following injury,and then gradually reduced.However,neural apoptosis remained at a high level.Caspase-3 expression positively correlated with neural apoptosis (r=0.864,P < 0.05).Caspase-3 expression and neural apoptosis significantly decreased following FTY720 therapy (P < 0.05).CONCLUSION:FTY720 significantly reduced caspase-3 expression and neural apoptosis in a rat model of acute spinal cord injury. | Liang Yang Decheng Lü Lianjie Zheng Zhaohui Wang Kai Tang Wei Zhang Xiaotian Li | 2010 | Neural Regeneration Research2010，5，9： | 7 |
| 14 | Processes and trends of the land use change in Aksu watershed in the central Asia from 1960 to 2008显示文摘Land use change (LUC) in trans-boundary watersheds is of great importance to environmental assessment. The Aksu River is the largest trans-boundary river crossing Kyrgyzstan and China,but there was little information on the LUC of the watershed. We quantitatively investigated the processes and trends of its LUC by using analytic models based on the land use data derived from the remote sensing images and topographic maps. The LUC was in the quasi-balanced status with a slight difference between the loss and the gain of the area for most land use types during the period of 1960-1990,whereas transferred to the unbalanced status with significant difference between the loss and gain of the area during the period of 1990-2008. At the same time,land conversion direction changed from two-way transition to one-way transition for the most land use types. The integrated rate of net change of land use during the period of 1990-2008 is 2.1 times of that during the period of 1960-1990. Information on the processes and trends of LUC is valuable for better understanding the environmental changes across the whole trans-boundary watershed,and helpful to decision-making management for Kyrgyzstan and China. | Zhou, DeCheng Luo, GePing Lu, Lei | 2010 | Journal of Arid Land2010，2，3： | 7 |
| 15 | Regional Soil Mapping Using Multi-Grade Representative Sampling and a Fuzzy Membership-Based Mapping Approach显示文摘High-resolution and detailed regional soil spatial distribution information is increasingly needed for ecological modeling and land resource management. For areas with no point data, regional soil mapping includes two steps: soil sampling and soil mapping. Because sampling over a large area is costly, efficient sampling strategies are required. A multi-grade representative sampling strategy, which designs a small number of representative samples with different representative grades to depict soil spatial variations at different scales,could be a potentially efficient sampling strategy for regional soil mapping. Additionally, a suitable soil mapping approach is needed to map regional soil variations based on a small number of samples. In this study, the multi-grade representative sampling strategy was applied and a fuzzy membership-weighted soil mapping approach was developed to map soil sand percentage and soil organic carbon(SOC) at 0–20 and 20–40 cm depths in a study area of 5 900 km2 in Anhui Province of China. First, geographical sub-areas were delineated using a parent lithology data layer. Next, fuzzy c-means clustering was applied to two climate and four terrain variables in each stratum. The clustering results(environmental cluster chains) were used to locate representative samples. Evaluations based on an independent validation sample set showed that the addition of samples with lower representativeness generally led to a decrease of root mean square error(RMSE). The declining rates of RMSE with the addition of samples slowed down for 20–40 cm depth, but fluctuated for 0–20 cm depth. The predicted SOC maps based on the representative samples exhibited higher accuracy, especially for soil depth 20–40 cm, as compared to those based on legacy soil data. Multi-grade representative sampling could be an effective sampling strategy at a regional scale. This sampling strategy, combined with the fuzzy membership-based mapping approach, could be an optional effective framework for regional soil property mapping. A more detailed and accurate soil parent material map and the addition of environmental variables representing human activities would improve mapping accuracy. | YANG Lin A-Xing ZHU ZHAO Yuguo LI Decheng ZHANG Ganlin ZHANG Shujie Lawrence E. BAND | 2017 | Pedosphere2017，27，2： | 5 |
| 16 | Zooarchaeological perspective on the Broad Spectrum Revolution in the Pleistocene-Holocene transitional period,with evidence from Shuidonggou Locality 12,China显示文摘Based on optimal foraging theory,prey animals from the Shuidonggou Locality 12(SDG12) are divided into three types according to body size and defense traits:high-ranked large game,low-ranked slow small game,and low-ranked fast small game.Application of the Reciprocal of Simpson's Index to the three types of animals from SDG12 yields a relatively high level of evenness,which implies a broader meat diet of the SDG12 hominids.Compared to values of taxonomic evenness from Mediterranean sites,it is suggested that this dietary expansion probably resulted from the occurrence of the Broad Spectrum Revolution rather than from climatic changes in the Shuidonggou area.Comparative studies between the Natufian phases in Hayonim Cave and the SDG12 validate this argument. | ZHANG Yue ZHANG ShuangQuan XU Xin LIU DeCheng WANG ChunXue PEI ShuWen WANG HuiMin GAO Xing | 2013 | Science China Earth Sciences2013，56，9： | 5 |
| 17 | A meta-analysis of the canopy light extinction coefficient in terrestrial ecosystems显示文摘华盖光扑灭系数(K) 是在影响生态系统碳,水,和精力过程的一个关键因素。然而, K 在多样的陆上的生态系统由于在里面地点大小的缺乏在大多数 biogeochemical 模型作为一个常数被假定。在这研究,由编在 88 个陆上的生态系统测量的 K 的数据,我们越过主要生态系统类型调查了这个索引的空间与时间的变化,包括草地,农田, shrubland,阔叶烟草森林,和 needleleaf 森林。我们的结果显示所有生物群系的平均 K 在完整的成长期间打字季节是 0.56。然而,在种季节的山峰的这价值是 0.49,显示季节的变化的某个度。另外,在 K 的大变化存在在以内并且在植物之中功能的类型。农田有 K (0.62 ) 的最高的价值,由阔叶烟草列在后面森林(0.59 ) , shrubland (0.56 ) ,草地(0.50 ) ,和 needleleaf 森林(0.45 ) 。没有重要空间关联在 K 和主要环境因素之间被发现,即,吝啬的年度降水,吝啬的年度温度,和叶区域索引(LAI ) 。Intra 每年,在 K 之间的重要否定关联和在 LAI 的季节的变化在自然生态系统被发现。然而,在农田,时间的关系是地点特定的。有在这研究观察的 LAI 的 K 和它的时间的关系的特定的价值可以贡献的生态系统类型改善了全球 biogeochemical 周期当模特儿。 | Liangxia ZHANG Zhongmin HU Jiangwen FAN Decheng ZHOU Fengpei TANG | 2014 | Frontiers of Earth Science2014，8，4： | 5 |
| 18 | Numerical Study of Viscous Wave-Making Resistance of Ship Navigation in Still Water显示文摘一个轮船鈥檚 电阻的预言特别粘滞做波浪的抵抗是在 CFD 应用的一个重要问题。在这份报纸,从到与在静止的水里进展的不同的壳形式的壳 6 的壳 1 的六艘轮船的电阻数字地用解答者 naoe-FOAM-SJTU 被学习,它基于开放源代码代码包裹 OpenFOAM 被开发。当认为二是速度条件(12 kn 和 16 kn ) 时,电阻的不同部件被计算并且比较。壳 3 的抵抗是最小当壳 5 的在一样是最大的时,加速。结果证明壳 3 是为类似的轮船的设计的一本好参考书,它能为壳形式优化提供一些珍贵指南。 | Ruosi Zha Haixuan Ye Zhirong Shen Decheng Wan | 2014 | Journal of Marine Science and Application2014，13，2： | 4 |
| 19 | Numerical Study on the Effect of Current Profiles on Vortex-Induced Vibrations in a Top-Tension Riser显示文摘In this paper, numerical simulations of vortex-induced vibrations in a vertical top-tension riser with a length-to-diameter ratio of 500 using our in-house code viv-FOAM-SJTU are presented. The time-dependent hydrodynamic forces on two-dimensional strips are obtained by solving the Navier-Stokes equations, which are, in turn, integrated into a finite-element structural model to obtain the riser deflections. The riser is discretized into 80 elements with its two ends set as pinned and 20 strips are located equidistant along the risers. Flow and structure are coupled by hydrodynamic forces and structural displacements. In order to study the effects of the shear rate, of the current profiles on the vortex-induced vibrations in the riser, vibrations, with varying shear rates, in both the in-line and cross-flow directions, are simulated. In addition to the time domain analysis, spectral analysis was conducted in both the temporal and spatial domains. Multi-mode vibration characteristics were observed in the riser. The relationship between dominant vibration mode number and the shear rate of current profiles is discussed. In general, the overall vibrations in the riser pipe include contributions from several modes and each mode persists over a range of shear rates. Moreover, the results suggest that with a larger shear rate the position of the maximum in-line time-averaged displacement will move closer to the end where the largest velocity is located. | Bowen Fu Lu Zou Decheng Wan | 2017 | Journal of Marine Science and Application2017，16，4： | 4 |
| 20 | Vertical distribution and storage of soil organic and inorganic carbon in a typical inland river basin,Northwest China显示文摘Knowledge of soil carbon(C) distribution and its relationship with the environment can improve our understanding of its biogeochemical cycling and help to establish sound regional models of C cycling. However, such knowledge is limited in environments with complex landscape configurations. In this study, we investigated the vertical distribution and storage of soil organic carbon(SOC) and soil inorganic carbon(SIC) in the 10 representative landscapes(alpine meadow, subalpine shrub and meadow, mountain grassland, mountain forest, typical steppe, desert steppe, Hexi Corridor oases cropland, Ruoshui River delta desert, Alxa Gobi desert, and sandy desert) with contrasting bioclimatic regimes in the Heihe River Basin, Northwest China. We also measured the 87 Sr/86 Sr ratio in soil carbonate to understand the sources of SIC because the ratio can be used as a proxy in calculating the contribution of pedogenic inorganic carbon(PIC) to total SIC. Our results showed that SOC contents generally decreased with increasing soil depth in all landscapes, while SIC contents exhibited more complicated variations along soil profiles in relation to pedogenic processes and parent materials at the various landscapes. There were significant differences of C stocks in the top meter among different landscapes, with SOC storage ranging from 0.82 kg C/m^2 in sandy desert to 50.48 kg C/m^2 in mountain forest and SIC storage ranging from 0.19 kg C/m^2 in alpine meadow to 21.91 kg C/m^2 in desert steppe. SIC contributed more than 75% of total C pool when SOC storage was lower than 10 kg C/m^2, and the proportion of PIC to SIC was greater than 70% as calculated from Sr isotopic ratio, suggesting the critical role of PIC in the C budget of this region. The considerable variations of SOC and SIC in different landscapes were attributed to different pedogenic environments resulted from contrasting climatic regimes, parent materials and vegetation types. This study provides an evidence for a general trade-off pattern between SOC and SIC, showing the compensatory effects of environmental conditions(especially climate) on SOC and SIC formation in these landscapes. This is largely attributed to the fact that the overall decrease in temperature and increase in precipitation from arid deserts to alpine mountains simultaneously facilitate the accumulation of SOC and depletion of SIC. | YANG Fan HUANG Laiming YANG Renmin YANG Fei LI Decheng ZHAO Yuguo YANG Jinling LIU Feng ZHANG Ganlin | 2018 | Journal of Arid Land2018，10，2： | 4 |
您所在的机构暂未开通此部分的功能，请联系管理员