紫刺参早期生长发育与体色形成的研究

本研究对紫刺参胚胎和幼体发育过程进行了显微观测,比较分析了其幼体早期生长情况与体色形成过程。结果表明:(1)在水温21.0±0.2℃条件下,紫刺参受精卵在受精10～15min后释放第一极体,5h 30min～6h 30min进入囊胚期, 18～20h发育成原肠胚; 30～34h进入耳状幼体阶段, 8～10d变态发育为樽形幼体, 12～14d发育成稚参;紫刺参胚胎和幼体发育时序与普通刺参无显著差异。(2)紫刺参早期发育中的樽形幼体发生率和附着变态率分别为58.4±4.7%和45.1±2.7%,高于普通刺参。(3)紫刺参浮游阶段后期随日龄增长表现出较普通刺参发育更快的优势,在日龄6～7d表现出显著差异(P0.05)。(4)紫刺参稚参在日龄35d前后自背部开始着色,50d～60d腹部开始着色,110d体表紫色转变近乎成参体色,完成变色过程。     

Relationships between body weight and other morphological traits in young sea cucumbers Apostichopus japonicas

Correlation, multiple regression, and path analyses were used to investigate the relationships between body weight and three other morphological traits in juvenile Japanese sea cucumbers Apostichopus japonicus . We measured live body weight (BW), body length (BL), numbers of papillae (NP), and numbers of tube feet (NF) at 60, 80, 100, and 130 days post-hatching (dph). We calculated path correlation coefficients, correlation indices ( R 2 ), and coefficients of determination with BW as the dependent variable and the other morphological traits as independent variables. The coefficient of variation for BW was high across all age groups, and all measured morphological traits were significantly correlated ( P < 0.01). BL had the greatest direct eff ect on BW across all age groups (60 dph, 0.526;80 dph, 0.404;100 dph, 0.620;and 130 dph, 0.681), while NF had the greatest indirect eff ect on BW across all age groups (60 dph, 0.528;80 dph, 0.452;100 dph, 0.666;and 130 dph, 0.603). Regression analyses between morphological traits and BW indicated that R 2 was greater than 0.85 only in the 100-dph specimens. The indirect eff ects of the other measured morphological traits on BW were age-dependent. The optimal regression equations, as determined with stepwise regression, were, for 60-dph specimens: BW 60 =10 (-3.04+0.092BL+0.014NP+0.014NF)( R 2 =0.632);for 80-dph specimens: BW 80 =10 (- 3.035+0.056BL+0.017NP+0.02NF)( R 2 =0.686);for 100-dph specimens: BW 100 =10 (- 3.742+0.069BL+0. 633 · lg (NP)+0. 464 · lg (NF))( R 2 =0.893);and for 130-dph specimens: BW 130 =10 (- 2.472+0.065BL+0.012NP)( R 2 =0.774). Our work clarified the correlation between various morphological traits and body weight of a commercially-important sea cucumber species ( A . japonicus ). Our predictive models for body weight might be useful for the aquaculture and selective breeding of A . japonicus . These models might also provide theoretical support for the indirect selection of traits that are difficult to select directly.     

基于PNAT描述的三维地籍ArcEngine开发方法

针对三维地籍对二维数据兼容不良问题,本文基于PNAT模型,利用ArcEngine开发出城镇三维地籍系统。通过对三维地籍要素进行描述与表达,推演出地上地下三维宗地体,并在ArcGIS中构造出三维宗地体模型。实验证明,运用ArcEngine开发的三维地籍系统,可完美兼容已有二维地籍数据,极大地减少了开发成本,提高了效率,同时系统兼具ArcGIS提供的分析功能,稍加改进即可实现自定义查询,实现三维地籍图属联合分析。基于ArcEngine的三维地籍开发是一种效率高、功能丰富的二次开发方法,其数据兼容性及空间分析功能明显优于其他非GIS二次开发平台。     

New photometric investigation of the low-mass-ratio contact binary star V1853 Orionis

Four-color charge-coupled device(CCD) light curves in the B, V, Rc and I c bands of the totaleclipsing binary system V1853 Orionis(V1853 Ori) are presented. By comparing our light curves with those published by previous investigators, it is determined that the O'Connell effect on the light curves has disappeared. By analyzing those multi-color light curves with the Wilson-Devinney code(W-D code),it is discovered that V1853 Ori is an A-type intermediate-contact binary with a degree of contact factor of f = 33.3%(3.7%) and a mass ratio of q = 0.1896(0.0013). Combining our 10 newly determined times of light minima together with others published in the literature, the period changes of the system are investigated. We found that the general trend of the observed minus calculated(O-C) curve shows a downward parabolic variation that corresponds to a long-term decrease in the orbital period with a rate of d P/dt =-1.96(0.46)×10^-7 d yr^-1. The long-term period decrease could be explained by mass transfer from the more-massive component to the less-massive one. By combining our photometric solutions with data from Gaia DR_2, absolute parameters were derived as M_1 = 1.20 M⊙, M_2 = 0.23 M⊙, R_1 = 1.36 R⊙and R_2 = 0.66 R⊙. The long-term period decrease and intermediate-contact configuration suggest that V1853 Ori will evolve into a high fill-out overcontact binary.     

绝对重力仪的自由落体凸轮驱动器设计与仿真

提出一种适合绝对重力仪的凸轮驱动器设计方法,研究了具体运动过程,基于自由落体运动得到凸轮驱动器的运动曲线,并采用SolidWorks进行仿真验证。结果表明,该设计方法可以解决绝对重力仪的自由落体凸轮驱动器设计实现问题。     

黔北喀斯特型铝土矿勘探工程间距的选择——以苟江铝土矿区水井坎矿段Ⅱ矿体生产勘探为例

本文以苟江铝土矿水井坎矿段Ⅱ矿体用50×50m工程间距进行勘探与25×25m工程间距进行生产勘探后,对其矿体形态、厚度控制及储量变化进行对比分析,以探寻此类矿床勘探应如何选用工程间距,才能更合理地对矿体进行控制,满足生产设计的要求。     

云南香格里拉市热林铅锌银矿特征及找矿标志

云南香格里拉市热林铅锌银矿,矿体呈似层状赋存于三叠系上统曲嘎寺组三段(T3q3)之大理岩与板岩的层间构造破碎带中,矿体明显受断层构造及特定的岩性控制.该矿床属断层破碎带控制的热液型铅锌银矿床,断层破碎带和地球化学异常是直接的找矿标志,沿断层带出现的硅化、碳酸盐化、黄铁矿化和角岩化是间接的找矿标志.     

宁夏土壤电阻率时空分布观测试验

通过在宁夏地区选择3种典型的土质结构,分别设置了3种不同结构的防雷接地体,经过1年的对比观测,用回归方法来分析平均气温和土壤湿度变化对不同土壤电阻率和不同结构接地电阻的影响,说明不同土质结构在不同时间（或季节）内、不同的温湿度条件下,对土壤电阻率的影响和不同结构防雷接地体的变化特点和规律,从而提出了防雷接地体的敷设和结构性能最优要求。     

水下滑翔机器人运动分析与载体设计

水下滑翔机器人是一种新型水下机器人,具有噪声低、航行距离远、续航时间长、成本低等特点。分析了水下滑翔机器人的驱动机理和运动实现,给出了水下滑翔机器人典型运动的仿真结果,并以正在设计的一水下滑翔机试验样机为研究对象,描述了样机的整体结构布局,详细研究了浮力调节机构、俯仰调节机构和横滚调节机构的实现方法,并就样机中各执行机构的设计实现进行了论述。     

基础地理信息网络化数据生产的设计与实现

针对目前数据采集与管理的现状运用具体实例论述了基于网络化数据生产的设计与实现过程