Advanced glycation endproducts in 35 types of seafood products consumed in eastern China     

WANG Jing  LI Zhenxing  PAVASE Ramesh Tushar  LIN Hong  ZOU Long  WEN Jie  LV Liangtao 《中国海洋大学学报(英文版)》2016,15(4):690-696

Advanced glycation endproducts(AGEs) have been recognized as hazards in processed foods that can induce chronic diseases such as cardiovascular disease, diabetes, and diabetic nephropathy. In this study, we investigated the AGEs contents of 35 types of industrial seafood products that are consumed frequently in eastern China. Total fluorescent AGEs level and Nε-carboxymethyl-lysine(CML) content were evaluated by fluorescence spectrophotometry and gas chromatography-mass spectrometry(GC-MS), respectively. The level of total fluorescent AGEs in seafood samples ranged from 39.37 to 1178.3 AU, and was higher in canned and packaged instant aquatic products that were processed at high temperatures. The CML content in seafood samples ranged from 44.8 to 439.1 mg per kg dried sample, and was higher in roasted seafood samples. The total fluorescent AGEs and CML content increased when seafood underwent high-temperature processing, but did not show an obvious correlation. The present study suggested that commonly consumed seafood contains different levels of AGEs, and the seafood processed at high temperatures always displays a high level of either AGEs or CML.  相似文献   

Morphodynamic mechanisms for the formation of asymmetric barchans: improvement of the Bagnold and Tsoar models     

Ping Lv  Zhibao Dong  Clement Narteau  Olivier Rozier 《Environmental Earth Sciences》2016,75(3):259

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Strata movement and surface subsidence prediction model of dense solid backfilling mining     

Qingbiao Guo  Guangli Guo  Xin Lv  Wenxin Zhang  Yikai Lin  Shuangyu Qin 《Environmental Earth Sciences》2016,75(21):1426

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Relationships among volcanic and hydrothermal activity and faults from the Shunnan 3-D well zone in the Tadong Area (Tarim Basin,China)     

Li KunBai  Lv HaiTao  Pu RenHai  Cao ZiCheng 《Arabian Journal of Geosciences》2016,9(17):692

Tarim Basin distributed widely two stages of Permian volcanic rocks. However, the location and timing of these rocks pinching out and the relationship between Ordovician carbonate hydrothermal reservoirs and fault activity remain unclear. The Shunnan (Shunnan here in after referred to as SN) 1 3-D well zone in the eastern Tarim Basin contains volcanic rocks, and the Ordovician layer contains a hydrothermal reservoir. This paper describes the lithology, stage, volcanic rock distribution, crater position and deposition pinch-out line of volcanic rocks based on drilling and 3-D seismic data. The Permian strata in the well zone contain only one stage of Kupkuciman Formation basalt and tuff, the Kaipeleicike Formation contains terrigenous clastic rock and the adjacent volcanic rocks of wells SN2 and GL (Gulong here in after referred to as GL) 2 exhibit an absence of deposition. Although the craters are distributed on both sides of the NNW faults that cross well SN4, their positions are also controlled by the intersection of earlier NEE and NW faults and later NNE faults. Furthermore, the Ordovician strata in the SN1 well zone developed abundant tubular high-amplitude anomalies and tabular high-amplitude anomalies via hydrothermal corrosion, and the anomaly distributions are similar to the positions of the craters, which are controlled by the intersection of multi-group faults and the density of the faults.  相似文献   

低空无人机视频影像可量测立体模型构建技术          下载免费PDF全文

王光辉  武斌敬  龙敬琪  王更 《海洋测绘》2016,(1):75-78

提出了一种利用无人机快速获取的视频数据的可量测立体模型构建方法。首先,通过无人机飞行平台快速获取视频数据,基于改进平板摄像机智能标定技术,获取摄像头的内方位元素,结合摄像机内方位参数、视频帧率、飞行高度、速度、影像分辨率等参数实现了基于实时视频流的关键帧影像自适应自动提取算法,并对提取关键帧影像进行畸变差改正;其次,通过对校正后的影像进行光束法空中三角测量加密处理,计算视频关键帧影像的外方位元素信息。最后,利用北京地区的试验数据进行了验证分析。结果表明利用能快速实现可量测立体模型构建,具有较高的量测精度,能有效的提高应急测绘条件下的灾情地理信息获取,为灾情评估和辅助决策提供依据。  相似文献   

苏里格大型致密砂岩气田储层结构与水平井提高采收率对策     

吕志凯  唐海发  刘群明  李小锋  王泽龙 《现代地质》2018,32(4):832

在分析苏里格气田辫状河体系及储层结构特征的基础上,提出了剖面储量集中度的概念,建立了厚层块状型、垂向叠置泛连通型、分散局部连通型、分散孤立型4种砂体分布模式,探讨了不同储层结构下的水平井采出程度,提出了水平井提高采收率技术对策。研究结果表明,辫状河沉积体系复合有效砂体由于“阻流带”的存在,直井动用不完善,水平井能克服“阻流带”的影响,提高层内储量动用程度;但由于砂体多层状分散分布,水平井开发会导致纵向含气层系储量动用不充分,影响层间采出程度。对于剖面储量集中度高的厚层块状型、垂向叠置泛连通型储层,采用水平井整体开发,Ⅰ+Ⅱ类井比例达70%以上,可显著提高储量动用程度和采收率。对于剖面储量集中度低的分散局部连通型储层,采用直井井网开发后进行甜点式优选水平井井位加密部署,可提高采收率10%以上。  相似文献   

北极斯瓦尔巴特群岛及邻区天然气水合物分解对气候、海洋环境和生物的影响     

聂云峰  于晶  陈宏文  万玲  范广慧  房强  吴怀春 《现代地质》2018,32(5):1012

天然气水合物是一种潜在的巨量能源,但其分解释放的甲烷可能对全球气候与海洋环境产生巨大影响。然而,人们目前对天然气水合物分解产生的环境和生物效应的了解还不够全面。北极地区的斯瓦尔巴特群岛及邻区的海底和冻土层中蕴含大量甲烷,对气候变化十分敏感,是人们研究天然气水合物对气候变化的响应机制和其分解对生态环境影响的绝佳场所。系统总结了斯瓦尔巴特群岛及邻区水合物分解的气候与环境效应,发现目前研究区水合物分解产生的甲烷进入大气的年际通量不大,对全球气候的影响可能有限;水合物分解对海底滑坡起到催化剂的作用,但不是首要因素;海底水合物分解释放的甲烷能打破原有的化学平衡、生产力分布规律与输送机制、生物耦合关系甚至不同栖息地间的连通性,进而影响底栖生物群落。这些认识对研究天然气水合物开采对生态环境可能造成的影响和采取相应防治措施具有一定的借鉴意义。  相似文献   

Study on the quantitative relationship between soil in situ strength and drilling parameters     

Xiangfeng Lv  Hongyuan Zhou  Lianman Xu 《Environmental Earth Sciences》2018,77(12):469

The rational use of drilling parameters is a hot issue in the field of geotechnical engineering and geological engineering. A new method, for evaluating the bearing capacity of soils using drilling parameters was proposed. First, through the mechanical analysis of the drill bit, the preconditions and theoretical formulas for calculating the bearing capacity of soils using the bit’s torque are clearly defined. Next, drilling tests and dynamic cone penetration tests were performed on miscellaneous fill, silty clay, sandy clay, medium coarse sand and gravel sand, and the empirical formula for calculating the bearing capacity of these soils were given. Then, using the new method and the empirical formula, the bearing capacity of the soil under the roadbed was examined. The test results show that the bit’s torque is a good parameter for the evaluation of the bearing capacity of the soil. Finally, the application scope of the new method and the empirical formula is discussed, and the subsequent research directions are pointed out.  相似文献   

Ion chemistry of groundwater and the possible controls within Lhasa River Basin,SW Tibetan Plateau     

Tao Zhang  Wutian Cai  Yingzhi Li  Tingting Geng  Zhiyin Zhang  Yonggao Lv  Miao Zhao  Jinwei Liu 《Arabian Journal of Geosciences》2018,11(17):510

In order to study the major ion chemistry and controls of groundwater, 65 groundwater samples were collected and their major ions measured from wells within Lhasa River Basin. Groundwater has the characteristics of slightly alkaline and moderate total dissolved solid (TDS). TDS concentration ranged from 122.0 to 489.9 mg/L with a median value of 271.2 mg/L. Almost all the groundwater samples suited for drinking and irrigation. The major cations of groundwater are Ca²⁺ and Mg²⁺, accounting for 59.6 and 31.3% of the cations, respectively. Meanwhile, HCO₃^? and SO₄^2? constituted about 56.7 and 36.9% of the anions, respectively, in Lhasa River Basin. The hydrochemical type of groundwater is HCO₃-SO₄-Ca-Mg. The chemical composition of groundwater samples located in the middle of Gibbs model, which indicates that the major chemical process of groundwater is controlled by rock weathering. Carbonate weathering was the dominant hydro-geochemical process controlling the concentration of major ions in groundwater within Lhasa River Basin, but silicate weathering also plays an important role.  相似文献   

对坡面径流挟沙力研究的几点认识   总被引：6，自引：0，他引：6       下载免费PDF全文

张光辉 《水科学进展》2018,29(2):151-158

坡面径流挟沙力是土壤侵蚀过程模型的核心输入参数。在系统界定坡面径流挟沙力概念的基础上,深入分析了坡面径流水动力学特性和泥沙特性对坡面径流挟沙力的影响及其机制,受降雨、地形、土壤、植被、土地利用、结皮形成、细沟发育和砾石出露等多种因素时空变异的综合影响,坡面径流挟沙力具有强烈的时空变化特征,导致坡面径流挟沙力的测定较为困难。将确定挟沙力常用的方法划分为河流挟沙力方程修正法、推理法、模型模拟法和测量法,比较分析了不同方法的优缺点。未来的研究应该重点关注挟沙力测定方法与技术、坡面径流输沙过程的动力机制、典型土壤的挟沙力、挟沙力方程构建与验证及变化条件下坡面径流挟沙力等方面。  相似文献