籼型两系杂交稻稻米品质性状的研究   总被引：1，自引：0，他引：1  

李伟  郭建夫  张建中 《广东海洋大学学报》2002,22(4):56-61

利用 4个籼型光温敏不育系与 9个籼型恢复系配组杂交 ,分析了 9个稻米外观及加工品质性状杂种一代的表现、配合力效应及其相关显著性。结果表明 ,杂种一代糙米率的达标率最高 ,而整精米率的达标率最低 ;不育系中的培矮 6 4S、恢复系中的HR1 5 7和HR1 5具有较好的一般配合力 ;品质性状优良的杂交组合 ,其双亲的一般配合力均较好 ;偏相关分析表明糙米率和整精米率均为独立性状 ,垩白粒率与米粒长度呈显著负相关 ,与垩白度及米粒宽度呈显著正相关 ,而米粒长与宽呈极显著正相关。  相似文献   

转基因水稻"竹转68"病害发生风险的初步研究     

袁红旭  许新萍  郭建夫  张建中  李宝健 《广东海洋大学学报》2001,21(4):52-56

采用抗病性鉴定和田间隔离小区试验病害调查相结合的方法,研究了转抗真菌基因"RC24"的转基因水稻"竹转68"的抗病性和病害发生规律,对"竹转68"田间释放后病害发生的风险进行了初步预测.试验结果表明,"竹转68"对纹枯病具有较高的抗病性,对稻瘟病的抗病性也有显著提高且存在田间抗病性.进一步的田间隔离小区试验结果表明"竹转68"田间释放后,病害发生轻,表现较好的综合抗病能力.  相似文献   

内蒙古铜矿找矿方向探讨   总被引：3，自引：0，他引：3  

徐国权  李建伏  张履桥 《内蒙古地质》2002,(2)

内蒙古具有有利的铜矿成矿地质条件,但与目前已发现的铜矿资源量不相适应。本文通过分析,说明内蒙古境内地质构造演化过程中,在不同地质历史阶段皆具有铜矿成矿有利的地质构造环境及岩浆活动,表明其具备了寻找铜矿床的最有利的前提条件,找矿潜力很大,并指出了铜矿找矿方向。  相似文献   

南宁市连续运行卫星定位服务系统的建设     

覃婕  韦波  黄俊华  任建福 《地理空间信息》2008,6(4):84-86

南宁市连续运行卫星定位服务系统（NNCORS）由基准站网、系统控制中心、数据传输系统、用户应用系统、用户数据中心五个部分组成,针对系统运行过程中遇到的数据备份、登陆不上、初始化时间较长和突发事件处理问题,提出了相应的解决方法。目前南宁CORS系统已初步建成并投入试运行,可全天候向南宁地区用户提供cm级实时和快速定位、mm级事后精密定位等服务,  相似文献   

Laboratory Investigations of the Hydro-Mechanical–Chemical Coupling Behaviour of Sandstone in CO2 Storage in Aquifers     

Hui Zhou  Dawei Hu  Fan Zhang  Jianfu Shao  Xiating Feng 《Rock Mechanics and Rock Engineering》2016,49(2):417-426

This paper is devoted to experimental investigations of the hydro-mechanical–chemical coupling behaviour of sandstone in the context of CO₂ storage in aquifers. We focused on the evolution of creep strain, the transport properties and the elastic modulus of sandstone under the effect of CO₂–brine or CO₂ alone. A summary of previous laboratory results is first presented, including mechanical, poromechanical and hydro-mechanical–chemical coupling properties. Tests were then performed to investigate the evolution of the creep strain and permeability during the injection of CO₂–brine or CO₂ alone. After the injection of CO₂–brine or CO₂ alone, an instantaneous volumetric dilatancy was observed due to the decrease in the effective confining stress. However, CO₂ alone had a significant influence on the creep strain and permeability compared to the small influence of CO₂–brine. This phenomenon can be attributed to the acceleration of the CO₂–brine–rock reaction by the generation of carbonic acid induced by the dissolution of CO₂ into the brine. The original indentation tests on samples after the CO₂–brine–rock reaction were also performed and indicated that the elastic modulus decreased with an increasing reaction time. The present laboratory results can advance our knowledge of the hydro-mechanical–chemical coupling behaviour of sandstone in CO₂ storage in aquifers.  相似文献   

Time-Dependent Behavior of Cataclastic Rocks in a Multi-Loading Triaxial Creep Test     

Yu Zhang  Jianfu Shao  Weiya Xu  Yun Jia 《Rock Mechanics and Rock Engineering》2016,49(9):3793-3803

  相似文献   

黄浦江上游水域的多光谱遥感水质监测与反演模型   总被引：5，自引：1，他引：5  

童小华  谢欢  仇雁翎  赵建夫 《武汉大学学报(信息科学版)》2006,31(10):851-854

运用遥感、GPS定位技术对黄浦江上游淀山湖及支干流水环境质量中的水质污染进行了监测，探讨了以实际监测数据与遥感多光谱特征数据建立溶解氧和透明度两种水质参数的遥感反演数学模型。结果表明，利用遥感技术和数据能有效地监测水质污染状况与分布情况，是一种较为快速、可行的监测手段。  相似文献   

安达坝址工程地质条件的初步研究     

屈龙  秦建甫  侯清波  符新阁 《中国煤田地质》2006,18(6):33-37

通过对地处青藏高原腹地,南水北调西线工程杜柯河安达坝址区工程地质条件的初步调查与研究,对坝区稳定、岸坡稳定、坝基稳定、坝基渗漏和河床覆盖层等主要工程地质问题进行了分析,并作出了阶段性结论:①坝段处于稳定区,坝段内水质较好,未发现水平或缓倾角的软弱结构面,可以满足混凝土面板堆石坝的建坝要求;②受F1、F2断层的影响,右岸岸坡稳定条件好于左岸;③坝基可能存在沿背斜核部、左坝肩断层破碎带集中渗漏问题及绕坝渗漏问题。  相似文献   

Effects of confining pressure and loading path on deformation and strength of cohesive granular materials: a three-dimensional DEM analysis     

Zhang  Yulong  Shao  Jianfu  Liu  Zaobao  Shi  Chong  De Saxcé  Géry 《Acta Geotechnica》2019,14(2):443-460

This paper is devoted to numerical analysis of strength and deformation of cohesive granular materials. The emphasis is put on the study of effects of confining pressure and loading path. To this end, the three-dimensional discrete element method is used. A nonlinear failure criterion for inter-granular interface bonding is proposed, and it is able to account for both tensile and shear failure for a large range of normal stress. This criterion is implemented in the particles flow code. The proposed failure model is calibrated from triaxial compression tests performed on representative sandstone. Numerical results are in good agreement with experimental data. In particular, the effect of confining pressure on compressive strength and failure pattern is well described by the proposed model. Furthermore, numerical predictions are studied, respectively, for compression and extension tests with a constant mean stress. It is shown that the failure strength and deformation process are clearly affected by loading path. Finally, a series of numerical simulations are performed on cubic samples with three independent principal stresses. It is found that the strength and failure mode are strongly influenced by the intermediate principal stress.

  相似文献   

Polybrominated diphenyl ethers and its methoxylated analogues in biota and sediment samples from two freshwater lakes in Yangtze River delta     

Xinyu Du  Hong Chang  Yihui Zhou  Yanling Qiu  Yan Wu  Zhifen Lin  Zhiliang Zhu  Jianfu Zhao 《Environmental Earth Sciences》2017,76(4):171

In the present study, sediments and biotas from two freshwater lakes in Yangze delta area were collected and analyzed for polybrominated diphenyl ethers (PBDEs) and methoxylated PBDEs (MeO–PBDEs). The concentrations of PBDEs in sediments and biotas ranged from 0.41 to 5.8 ng/g dry weight and from 4.6 to 100 ng/g lipid weight, respectively, while those of MeO–PBDEs were much lower (sediment: <LOQ-0.014 ng/g dry weight, biota: <LOQ-2.1 ng/g lipid weight). The levels of both brominated substances in sediments and biotas were in the moderate to low range compared with other studies. Different BDE congeners were found between two lakes probably due to the different exogenous sources and metabolic stages. Similar occurrence of higher brominated congeners (e.g., BDE-209) in sediments and biotas indicated sediments as a possible source of PBDEs for biotas. The different contribution of lower and higher brominated congeners between sediments and biotas may be due to the combined effect of biotransformation and bioavailability.  相似文献