摘要：This research proposes a novel three-dimensional gravity inversion based on sparse recovery in compress sensing. Zero norm is selected as the objective function, which is then iteratively solved by the approximate zero norm solution. The inversion approach mainly employs forward modeling; a depth weight function is introduced into the objective function of the zero norms. Sparse inversion results are obtained by the corresponding optimal mathematical method. To achieve the practical geophysical and geological significance of the results, penalty function is applied to constrain the density values. Results obtained by proposed provide clear boundary depth and density contrast distribution information. The method's accuracy, validity, and reliability are verified by comparing its results with those of synthetic models. To further explain its reliability, a practical gravity data is obtained for a region in Texas, USA is applied. Inversion results for this region are compared with those of previous studies, including a research of logging data in the same area. The depth of salt dome obtained by the inversion method is 4.2 km, which is in good agreement with the 4.4 km value from the logging data. From this, the practicality of the inversion method is also validated.

摘要：With the continuous development of full tensor gradiometer （FTG） measurement techniques, three-dimensional （3D） inversion of FTG data is becoming increasingly used in oil and gas exploration. In the fast processing and interpretation of large-scale high-precision data, the use of the graphics processing unit process unit （GPU） and preconditioning methods are very important in the data inversion. In this paper, an improved preconditioned conjugate gradient algorithm is proposed by combining the symmetric successive over-relaxation （SSOR） technique and the incomplete Choleksy decomposition conjugate gradient algorithm （ICCG）. Since preparing the preconditioner requires extra time, a parallel implement based on GPU is proposed. The improved method is then applied in the inversion of noise- contaminated synthetic data to prove its adaptability in the inversion of 3D FTG data. Results show that the parallel SSOR-ICCG algorithm based on NVIDIA Tesla C2050 GPU achieves a speedup of approximately 25 times that of a serial program using a 2.0 GHz Central Processing Unit （CPU）. Real airbome gravity-gradiometry data from Vinton salt dome （south- west Louisiana, USA） are also considered. Good results are obtained, which verifies the efficiency and feasibility of the proposed parallel method in fast inversion of 3D FTG data.

摘要：Rice cultivar Norin 8 and its mutant Norin 8m harbour bentazon resistance trait and bentazon susceptibility trait respectively. A total of 360 arbitrary 10-mer oligonucleotide primers were screened on the genomic DNA of Norin 8 and Norin 8m with RAPD technique. Among which, five primers produced seven polymorphic RAPD bands between Norin 8 and Norin 8m. Amplified RAPD polymorphic products were cloned and sequenced. The sequences were used to design primers for PCR. Five SCAR markers, SCAR/G18/883, SCAR/G18/890, SCAR/G18/919/948, SCAR/D10/1237 and SCAR/F03/1186, were developed from OPG18/943, OPG18/972, OPD10/1248 and OPF03/1198. F-2 progeny of 320 individuals was analyzed to map SCAR markers in relationship to ben or Ben genes. SCAR markers of SCAR/G18/883, SCAR/G18/890, SCAR/G18/919/948 were shown to cosegregate with ben or Ben genes, and SCAR/D10/1237 to be linked of Ben gene with a distance of (14.8 +/- 2.1) cM. The genetic linkage to ben gene and SCAR markers was identified by a pair of near isogenic lines H121 and Hben121. Southern blotting analysis and segregation ratio of F-2 progeny revealed that OPG18/943 and OPG18/972 were single-copy in genome, and locus of OPG18/943 and OPG18/972 were allelic and sequence tagged sites. It is the first report on molecular markers linked to ben or Ben genes. The markers are useful to marker-assisted selection for the breeding and tag ben gene with map-based cloning.

摘要：为了探明回填层对护盾式TBM隧道运营阶段管片受力的影响,建立考虑回填层的围岩抗力系数计算方法,为隧道设计中地层抗力系数的确定提供理论基础,设计相应的模型试验,对比了有回填层和无回填层时管片的受力特点,并采用厚壁圆筒理论推导了围岩-回填层等效弹性抗力系数的计算方法。研究结果表明:有回填层和无回填层时,管片运营阶段的弯矩、轴力、变形具有较大的差别,回填层的作用不可忽略;回填层厚度、泊松比、弹性模量、管片外半径均对围岩-回填层等效弹性抗力系数产生影响,其中回填层弹性模量为主要影响因素;回填层存在一个临界弹性模量,当回填层弹性模量大于临界弹性模量时,计算得出的围岩-回填层等效弹性抗力系数大于围岩弹性抗力系数,回填层对围岩起到增强作用,研究给出了回填层临界弹性模量计算公式,并得出回填层临界弹性模量取值与围岩弹性模量密切相关;考虑回填层的数值计算结果更接近模型试验结果,验证了围岩-回填层等效弹性抗力系数计算方法的准确性。

摘要：文章采用有限元计算法和蚁群算法,对罐装水泥运输船船体结构设计方案进行结构计算分析,结果显示:采用去除高应力区域结构以阻断载荷传递的方法比增强船体梁甲板结构的方法更为合理,对于改善结构局部高应力水平具有比较优势;通过蚁群算法对目标船货舱区域中剖面结构进行优化设计,以每个板格的板与加强筋的厚度、纵骨间距为设计变量,以单位长度结构模型重量最轻为目标函数,以中国船级社《钢质内河船舶建造规范(2016)》中关于直接计算的边界条件要求为优化算法的边界条件,选取合适的优化参数,使得优化后的结构重量下降10.44%。文中采用的结构调整方式及优化方法可为同类船型的设计提供参考。

摘要：目的通过分析可能影响结直肠腺瘤内镜摘除术后的复发因素,为结直肠腺瘤内镜摘除术后的定期随访提供参考。方法收集2013年1月1日至2014年12月31日在华东医院消化科住院行内镜下结直肠腺瘤摘除术且术后随访结肠镜的患者相关信息,包括性别、年龄、吸烟史、饮酒史、高血压病史、糖尿病史、脂肪肝情况、胆囊切除史、幽门螺杆菌感染情况、相关代谢指标、腺瘤个数、腺瘤大小、腺瘤部位、腺瘤病理等。通过Logistic回归分析进行单因素和多因素分析,探讨影响结直肠腺瘤内镜摘除术后复发的因素。结果共纳入283例患者,低危腺瘤复发率为39.3%,高危腺瘤复发率为56.3%,总复发率为52.7%。单因素分析发现幽门螺杆菌感染和基础腺瘤个数是结直肠腺瘤内镜摘除术后复发的危险因素(P均<0.001,OR值分别为2.802和2.789,95%CI分别为1.660~4.728和1.667~4.668),多因素分析发现幽门螺杆菌感染和基础腺瘤个数是结直肠腺瘤内镜摘除术后复发的危险因素(P均<0.001,OR值分别为3.316和2.799,95%CI分别为1.869~5.884和1.578~4.963)。结论结直肠腺瘤内镜摘除术后的复发可能与幽门螺杆菌感染和基础结直肠腺瘤的个数有关。

摘要：为探明盾构隧道基岩爆破对管片外荷载的影响,以珠海马骝洲交通隧道工程为依托,介绍改进的基岩爆破预处理措施,采用现场测试的方法对隧道无基岩地层断面及基岩爆破扰动地层断面处的管片外侧水土压力进行长期自动监测。得到以下结论:(1)基岩爆破装药结构经现场验证具有良好的爆破效果,可简化施工作业,利于盾构施工;(2)海底基岩爆破破坏土层的原有结构,爆破地层施工过程中水压力消散较慢,水土"耦合"更为复杂,隧道侧压力增大;(3)监测数据表明无论土层爆破与否,隧道围岩压力均表现以水压力为主的特征。

摘要：纤维加筋技术在复合土和混凝土等工程加固领域应用广泛,但在生态护坡领域的应用则鲜有报道。通过自主设计的试验装置,研究了单根聚丙烯纤维在不同含水率、不同干密度和不同龄期植被混凝土中的拉拔特性,分析了拉拔试验前后纤维的显微特征,并确定了临界加筋长度经验公式。研究表明:纤维拉力-位移曲线呈显著的多峰特征,主要与植被混凝土中存在水泥水化产物有关;1 d试样界面抗剪强度在最优含水率时存在极小值,主要原因是试样初期的筋-土界面锚固力提高值相较于摩擦力减小值要低;随着干密度和龄期的增长,界面抗剪强度和残余抗剪强度都显著提高。通过多元线性回归分析,得出植被混凝土中纤维临界加筋长度的经验公式,对提升植被混凝土在高寒、强降雨、坡面高陡等恶劣环境下的工程耐久性有一定指导意义。

摘要：总结了近几年来在实验课独立设课的研究与实践中的实验教学特点和效果,认为专业实验独立设课的改革是必要而且是可能的,专业实验独立设课改革的关键,是如何整合课程和综合性、设计性实验的设计、再造与创新。

摘要：根据流动监控系统的技术性能要求,从车辆、车体配置,监测系统配置,辅助设备方面叙述了环境空气流动监控系统的设计。