Digital Geological Mapping of Sinus Iridum Area of the Moon Based on the Chang'E-I Data

Based on the CCD images,IIM data and DEM data of China＇s lunar exploration project （Chang＇E-Ⅰ） and related processed and analytic results,an integrated study of regional geology of Sinus Iridum and its adjacent area was conducted,and a series of relevant researches and analyses were carried out,including analysis of impact craters and their extrusive and accumulative materials,division of stratigraphic and tectonic units and classification of rock types,integrated analysis of chronology and lunar evolution history.In consideration of crater＇s shape features,quantity and preserving status of filling materials,the lunar impact craters can be divided into 7 types and 11 subtypes,and the accumulative materials of craters are divided into 6 types and 9 accumulative groups.According to the content and distribution of TiO2 and image characteristics,the basalts are divided into high-TiO2,medium-TiO2 and low-TiO2 basalts.Discussion was made on division of tectonic units and evolution features in the study area.The geological map of the Sinus Iridum Quadrangle （LQ-4） at a scale of 1∶2.5 M was preliminarily compiled with the ArcGIS system,and the spatial database of the map was established.Related technical specification,procedure and method for lunar geological mapping have been worked out,so as to lay a foundation for the forthcoming geological mapping of the global Moon in China by using the data of Chang＇E-Ⅱ and also for comprehensive study and geological mapping of other celestial bodies in the future.

Pool Sizes and Turnover of Soil Organic Carbon of Farmland Soil in Karst Area of Guilin

The three-pool and first-order model separates the mineralizable organic carbon into active,slow,and passive carbon pools.This paper used the model and decomposition curves of the soil organic carbon to fit the active pool and its decomposition rate,slow pool and its decomposition rate.The results showed that the size of the active pool from different profiles accounted for 2.09%-3.08% of the total soil organic carbon and the mean residue time was 3.57-17.21 days.And the size of the slow pool accounted for 3.19%-43.55% and the mean residue time was 1.12-4.94 years.Acid hydrolysis（6M HCl） was used to fractionate the passive organic carbon,which accounted for 50.83%-94.44% of the total soil organic carbon.

Introduce Dissipation for Cylindrical Structures with Moon-Pool of Restricted Entrances

In order to consider the viscous effect,the introduction of a parametric dissipation and new results are realized by applying the new formulation combining and dynamic conditions over the free-surface with viscous terms. The dispersion equation is then modified by assuming an additional term in the boundary condition at the free-surface and wave-number becomes complex number with a small imaginary part which ensures the decay of wave amplitudes. The comparisons of numerical results and model test measurement on wave elevation at the moon-pool center is obtained both for the peak period and for the amplitude at resonance by choosing an appropriated dissipation coefficient. The results show that the introduce dissipation is not only effective but also reliable to provide realistic predictions.

Variation of Air-Sea Heat Fluxes over the Western Pacific Warm Pool Area and Its Relationship with the South China Sea Summer Monsoon Onset

Based on oceanic and atmospheric parameters retrieved by satellite remote sensing using a neural network method, air-sea heat fluxes over the western Pacific warm pool area were calculated with the advanced the advanced Coupled Ocean-Atmosphere Response Experiment 3.0 (COARE3.0) bulk algorithm method. Then, the average annual and interannual characteristics of these fluxes were analyzed. The rela- tionship between the fluxes and the South China Sea (SCS) summer monsoon onset is highlighted. The results indicate that these fluxes have clear temporal and spatial characteristics. The sensible heat flux is at its maximum in the Kuroshio area, while the latent heat flux is at its maximum in the North Equatorial Current and Kuroshio area. The distribution of average annual air-sea heat fluxes shows that both sensible and latent heat fluxes are maximized in winter and minimized in summer. The air-sea heat fluxes have obvious interannual variations. Correlation analysis indicates a close lag-correlation between air-sea heat fluxes in the western Pacific warm pool area and at the SCS summer monsoon onset. The lagcorrelation can therefore predict the SCS summer monsoon onset, providing a reference for the study of precipitation related to the monsoon.

On Waterscapes in Urban Residential Area from the Perspective of Rain Garden and Eco-pool Designs

Due to the high cost for operating and maintaining waterscapes, waterscapes in many residential areas have been laid aside and even become pollution sources. Taking MCC Beiluyuan (Residential Area) in Chongqing Municipality for example, concrete strategies of using natural terrains to design rain garden and eco-pool, collect rainwater, construct bottom of the bath, and combine plants were introduced, so as to explore a new approach of creating green and ecological modern residential landscapes.

A numerical study of the impact of SST anomaly in the warm pool area on atmospheric circulation in winter

In this paper the impacts of the anomalous SST in the warm pool area of the Western Equatorial Pacific on the winter time circulation and the East Asian monsoon are studied by using the NCAR CCM. It is found that the abnormal heating in the warm pool area will change the strength and the position of the Walker Cell in the Equatorial Pacific and the anti-Walker Cell in the equatorial Indian Ocean. Both the Walker and anti-Walker Cells are strengthened. The local Hadley Cells over two hemispheres near the warm pool are also strengthened. The subtropical highs in two hemispheres become stronger and move poleward slightly. The westerly jets in the extratropical regions have similar changes as the subtropical highs. The winter monsoon in South-East Asia is weakened by the abnormal heating in the warm pool. The experiment also show that there are wave trains emanating from surrounding areas of the warm pool to the high latitudes, causing various changes in circulations and local weather.

An experimental research of fluid piston oscillation in square moon pool under the wave-flow combined conditions

The article studies the oscillation features of the water in the square moon pool under the circumstances of wave-flow combined conditions. Comparing with the results of experiments of the square moon pool, a series of studies reveal that the water piston oscillation phenomenon is quite similar to that of the circular one. Two types of oscillation are exhibited under different incoming wave periods, i.e. self-excited oscillation and forced oscillation. The difference between the circular and square moon pool is that the attack angle makes greater influences on the square one. "Beating phenomenon" is also found in the square moon pool which is not mentioned of the circular one.

激光选区熔化316 L不锈钢熔池面积对力学性能的影响

为了探索激光选区熔化316 L不锈钢熔池对力学性能的影响,本研究通过激光选区熔化技术打印4组不同工艺参数的12个样品,并对样品进行室温拉伸和微观结构表征,提出了基于Matlab工具箱以及改进Canny算法提取熔池面积,同时观察每组的熔池面积与每组对应抗拉强度的变化曲线。结果表明:熔池面积逐渐增大的同时,其样品抗拉强度也随之增大,两者具有同样的变化趋势,不仅如此,当熔池面积达到最大值0.042 mm^(2)时,抗拉强度达到最大值509.46 MPa。

海洋沉积证据在低纬过程气候变化中的应用及展望

在国内外研究的基础上,对印太暖池区的沃克环流和厄尔尼诺-南方涛动(ENSO)、热带辐合带(ITCZ)等低纬过程的空间分布和随时间的变化规律及其研究方法进行初步归纳,并指出研究中存在的问题。本文论述了厄尔尼诺-南方涛动变率在全新世早期及中世纪气候异常期(1 000~700 a BP)的晚期逐渐增强,介绍了热带辐合带在BA暖期(B?llingAller?d Warm Period)和前北方期(pre-Boreal,10.3~9.5 ka BP)的北移,以及在新仙女木事件(Younger Dryas Event,12.5~11.5 ka BP)和北大西洋冷期(距今7.5~5 ka BP)期间的南移。对低纬过程长时间尺度轨道周期的探讨表明,末次冰盛期赤道东太平洋出现了较偏南的热带辐合带锋面系统,甚至在1.65 Ma冰期,热带辐合带也有快速南移的证据。海洋沉积的粒度、黏土矿物、陆源粉尘、元素和同位素、有孔虫分析等研究方法在推测厄尔尼诺-南方涛动和热带辐合带位移中有很好的应用,建议以陆源生态系统对气候的响应为切入点、以孢粉为手段来探讨陆源植被、气候、火灾和海-陆大气环流等低纬过程的变化特征,进而反演沃克环流(或厄尔尼诺-南方涛动)演化和热带辐合带位移的影响。

基于改进YOLOv5及危险区域判断的碰撞预警系统研究

为提升碰撞预警系统对周围环境的感知能力,提出一种基于YOLOv5及危险区域判断的碰撞预警系统。首先,通过通道注意力模块提高模型的判别能力和准确性,然后,使用路径聚合网络与空间金字塔池化提高模型对多尺度特征的提取能力,最后,通过引入预警激活区域过滤相对安全的目标,提高了预警系统的预警精确度。结果表明,引入预警激活区域后,与无预警激活区域相比,预警系统的准确度、精度和召回率分别提高20%、50%和26.7%,运行速度提升49.1%,进一步证明了方法的有效性。

旋喷桩在顶管工程软弱土体加固中的应用

天津市南水北调中线滨海新区供水一期工程是天津市内输配水工程的重要组成部分,建设任务是向天津市滨海新区输送引江原水,输水管材采用2根直径2 600 mmPCCP管道,局部辅以钢管。输水管道所经紫阳道泥浆池占地面积大,泥浆较深,成为管道施工难点。根据现场地形、地质条件,经比较分析,采用顶管穿越方案,其中泥浆加固是方案的重难点。加固方案的选择不仅要安全可靠,还要经济,便于实施。经分析论证,采用旋喷桩加固方案,并确定加固范围、桩径、桩长、水泥掺量等重要参数。

MSC Pool应用实例分析及部署建议

移动核心网技术不断发展,规模不断扩大,对网络稳定安全性提出了较高要求,池组化技术提供了较为完善的容灾备份解决办法。通过分析某运营商大省网络现状,从MSC POOL覆盖区域规划、NRI分配、容量规划等关键点出发,阐述并分析了该省MSC POOL应用实施的多个细节,特别针对该省省会城市多厂家并存的设备设置情况和2G/3G复杂覆盖现状,采用图表结合的方式进行MSC POOL规划思路详细描述,同时对MSC POOL在现网部署和实施过程等方面进行了经验总结和建议。

大洋钻探船月池扶正器结构准静态设计方法

大洋钻探船较浮式平台船体幅值响应更剧烈,钻柱与月池干涉风险高,为此,设计了一种月池扶正器。针对钻柱运动特点和载荷分布,设计了月池扶正器整体结构,还原海上洋流载荷激励,分析了月池扶正器在钻井、下套管及钻井船漂移3种不同工况下的极限承载能力,根据极限状态下的破坏模式分析各工况的载荷分布和风险点,并提出结构改进方案。研究表明:月池扶正器易发生失效破坏的位置在销轴处;月池扶正器在钻井船漂移工况下较为危险;通过调整基座销轴位置,并增加一组抱瓦油缸,可以降低整体结构和销轴的载荷分布。该研究成果为后续月池扶正器结构优化设计提供了理论支撑。

Study on security and protection of original ecotourism resources in the mountain areas of western Guangxi

Original ecotourism resources mainly refer to natural and human original ecotourism resources, and it's of fragility, rarity and irreversibility. As a valuable historic heritage and important tourism resources, it plays a significant role in developing tourism and economy in such areas as the underdeveloped areas, the mountain areas and mi-nority areas. The tourism resources in the western mountain areas of Guangxi owe superiorities and characteristics to their original ecology. Yet, western Guangxi is an ethnic region with fragile karst eco-environment, so it is special to exploit the tourism resources. The paper defines original ecotourism and analyses the specialties and advantages of the original ecotourism resources as well as the frailty of the ecotourism resources of the region. The ways of thinking are put forward for safe preservation and sustainable development of the original ecotourism resources, i.e. carrying out measures for the multi-grade protection of heritage resources, setting up a ethnic ecomuseum/ ethnic culture eco-park and a gene pool of ethnic cultures, etc.

新疆地区规模化奶牛场存贮池容积参数估算研究

为解决新疆地区规模化奶牛场污水存贮问题,通过分析新疆地区南北疆的降水量、蒸发量,探究该地区规模化奶牛养殖污水长期存贮的存贮周期与存贮池设计参数。研究结果表明,新疆地区奶牛场污水存贮周期6个月左右较为合适,北疆地区干清粪与水冲粪奶牛场存贮池建造参数分别为池深6m、池底面积543.10m^(2)、池底容积3258.60m^(3);池深6m、池底面积740.59m^(2)、池底容积4443.54m^(3);南疆地区干清粪与水冲粪奶牛场存贮池建造参数分别为池深6m、池底面积504.26m^(2)、池底容积3025.56m^(3);池深6m、池底面积687.62m^(2)、池底容积4125.72m^(3)。

基于单井架钻机的月池区离线作业工艺分析

针对传统单井架海上钻井平台、钻探船作业时,无法同时完成其他并行辅助管线的连接、下放作业问题,提出了月池区离线作业思路,通过在月池区防喷器台车上加装可以提升、下放、悬持管线的动力装置,配合原钻机系统配套的猫道机、排管机、铁钻工等设备,实现在月池区接装、下放、悬持钻杆柱、套管柱及其他管串。使得海洋单井架钻井平台和钻探船在原井口进行正常钻井作业的同时,可以在月池区并行接装管串,实现并行作业,节省大量的钻井辅助作业时间,极大降低钻井成本。

一种新型环路重力热管的数值模拟和性能优化

研究了一种新型的环路重力热管(LGHP),并提出一种基于VOF方法的简化两相流数值模型,能够有效地模拟热管蒸发器内部气泡的产生和干涸区的位置,从而研究蒸发器内部工质的流动特性。在数值模拟的基础上改进了蒸发器的流道结构,以延缓水平放置时蒸发器干涸区的出现。通过实验验证发现改进后蒸发器的传热性能得到了很大的提高,蒸发器中制冷剂的液相积存量得以提升,使其极限热通量(CHF)提高到140 kW/m2(加热功率2000.7 W),为改进前CHF的两倍。证明该简化模型在模拟干涸区位置方面具有准确性,可以为进一步的设计和改进平板蒸发器流道结构提供参考。

超大月池专用工程驳船在船整体打捞迁移工程中的应用

介绍创新的超大月池工程驳船“奋力”轮的设计构想,“奋力”轮在“长江口二号”古船整体打捞迁移工程施工中的高效应用,以及古船打捞提升力的计算对比实际打捞提升质量的情况.“奋力”轮在“长江口二号”古船整体打捞迁移工程中的成功应用,为未来古船打捞提供参考技术方案.

云南腾冲地区地震的潮汐应力触发作用

选用云南腾冲地区2009~2019年地震目录,采用Schuster检验方法分析地震活动的潮汐相位角分布特征,并结合2019年地震活动与月相的对应关系,探索腾冲地区的地震活动与天文潮汐应力可能存在的关系。Schuster检验结果显示,腾冲地区的地震发生时刻存在优势潮汐相位角,Schuster检验P值远小于5%;2019年地震的发生时间与朔望呈现一定的对应关系,尤其是中强地震发生时其月相效应更明显。2种统计检验均表明,腾冲地区的地震活动与天文潮汐有一定的相关性,且主要是较浅的地震活动受到天文潮汐的调制作用。

含月池和输运管的深海采矿船水动力特性研究

深海采矿船是未来人类获取深海矿产资源的重要装备,研究其水动力特性具有重要意义。月池和输运管是影响深海采矿船水动力特性的重要因素。以世界上第一艘超深水采矿船“鹦鹉螺新纪元”号为研究对象,基于三维势流理论,分析月池尺寸、输运管长度及内径对采矿船水运动特性的影响。结果表明:月池开口会使采矿船垂荡、纵荡和纵摇运动出现共振峰,峰值随着开口尺寸的增加而增大,其中垂荡运动峰值可增加将近2倍;输运管的存在会明显改变采矿船横摇运动固有周期,增大垂荡运动峰值,降低横摇运动峰值,对横荡和纵荡运动的影响亦较大,当输运管长度为5000 m,内径为0.4805 m时,横荡和纵荡响应峰值能够达到无输运管时的3倍以上。通过探究月池开孔和输运管不同参数对采矿船运动的影响,为深海采矿船月池和输运管设计提供一定的借鉴和参考。