Distribution and number change of the Littorinid(Gastropoda) on intertidal hard bed in the Jiulong Estuary, Fujian Province

-Among four species of Littorinid, Littorina scabra, L. brevicula, Nodiliitorina millegrana and N. pyramidalis pyramidalis, on the hard intertidal zone in the Jiulong Estuary, Fujian, L. scabra has the most extensive distribution both vertically and horizontally, and the highest anual average density. The uppermost limit of vertical distribution of N. pyramidalis pyramidalis is higher than the other three Littorinid. Desiccation is a main factor affecting the uppermost limit of vertical distribution of the Littorinid. The increasing wave action will raise the uppermost limit vertical distribution of Littorinid. With seasonal changes, the densities of the Littorinid also change in different tidal zonations. Difference in salinity is the main factor affecting the horizontal distribution of the Littorinid in the estuary.     

军曹鱼(Rachycentron canadum)幼鱼对环境低氧胁迫氧化应激与能量利用指标的响应

本文探究环境低氧对军曹鱼(Rachycentron canadum)氧化应激和能量利用指标的影响,为军曹鱼的健康养殖提供参考依据。通过设置低氧胁迫–恢复实验,将军曹鱼幼鱼(平均体质量(220.67±20.73)g)在低氧((2.64±0.25)mg/L)胁迫3 h及复氧((6.34±0.15)mg/L)8 h、24 h和48 h后,测定其肝脏和肌肉组织的氧化应激与能量利用指标。结果显示,低氧胁迫后,肝脏中丙二醛(Malondialdehyde,MDA)、过氧化氢酶(Catalase,CAT)和谷胱甘肽还原酶(Glutathione Reductase,GR)活力均显著低于对照组(p<0.05),乳酸脱氢酶(Lactate Dehydrogenase,LDH)活性显著高于对照组(p <0.05);肌肉中MDA和脂质过氧化物(Lipid Peroxidase,LPO)活性均显著低于对照组(p<0.05),超氧化物歧化酶(Superoxide Dismutase,SOD)和LDH活性均显著高于对照组(p<0.05);肌糖原和肝糖原含量极显著低于对照组(p<0.0...     

Radial velocities of the components of multiple star systems of Trapezium type. I

Translated fromAstrofizika, Vol. 36, No. 2, pp. 273–275, April–June 1993.     

Differential rotation of the sun determined tracing sunspots and oscillations of sunspot tilt angle

The time and spatial characteristics of 324 large sunspots (S50 millionths of the solar hemisphere) selected from the Abastumani Astrophysical Observatory photoheliogram collection (1950–1990) have been studied. The variations of sunspot angular rotation velocity residuals and oscillations of sunspot tilt angle were analyzed. It has been shown that the differential rotation rate of selected sunspots correlates on average with the solar cycle. The deceleration of differential rotation of large sunspots begins on the ascending arm of the activity curve and ends on the descending arm reaching minimum near the epochs of solar activity maxima. This behavior disappears during the 21st cycle. The amplitudes and periods of sunspot tilt-angle oscillations correlate well with the solar activity cycle. Near the epochs of activity maximum there appear sunspots with large amplitudes and periods showing a significant scatter while the scatter near the minimum is rather low. We also found evidence of phase difference between the sunspot angular rotation velocity and the amplitudes and periods of tilt-angle oscillations.     

Catalog of equatorial coordinates and <Emphasis Type="Italic">B</Emphasis>-magnitudes of stars of the Kitab part of the FON project

The processing of the plates of the Kitab part of the FON project has been completed. In total, 1963 plates were processed. The catalog of equatorial coordinates α, δ, and B-magnitudes for 13 413268 stars and galaxies up to B ≤ 17.5 ^m for the epoch 1984.97 is compiled. The Epson Expression 10000XL scanner with a 1200 dpi scanning mode and a plate size of 30 × 30 cm or 13000 × 13000 pel was used to digitize astronegatives. Coordinates of stars and galaxies are obtained in the Tycho-2 catalog system and B-magnitudes are obtained in the photovoltaic system. The catalog internal accuracy for all objects is σ_α,δ = 0.23" and σ _B = 0.15 ^m (for stars in the range B = 5 ^m …14 ^m , errors are σ_α,δ = 0.085" and σ _B = 0.054 ^m ) for equatorial coordinates and stellar B-magnitudes, respectively. Convergence between the calculated and reference positions is σ_α,δ = 0.042", and convergence between photoelectric B-magnitudes is σ _B = 0.16 ^m . Coordinate errors with respect to the UCAC-4 catalog are σ_α,δ = 0.26" (9892697 or 73.75% of stars and galaxies were identified).     

The removal of color and COD from wastewater containing water base color by coagulation process

In this study acrylic water base color was removed from synthetic wastewater using coagulation process. Experiments were conducted on the sample containing 100 mg/L and 400 mg/L of acrylic water base color. Destruction of color by means of coagulation/flocculation techniques using ferrous sulfate, alum, lime and polyelectrolyte (cationic, anionic and non ionic). The study was performed in a systematic approach searching optimum values of alum and FeSO₄ concentration, pH and temperature. All the experiments were run in a laboratory scale.The obtained results show that treatment with alum and ferrous sulfate alone proved to be very effective in removing the color (> 99 %) and part of COD (60–70 %) from aqueous solution. Lime alone did not significant change on COD and color removal.     

湖南洛塔屋檐洞水库生态安全指标体系及综合评判

本文以DSR模型为框架建立了湖南洛塔屋檐洞水库生态安全评价指标体系,并引入缀块丰富度密度、聚集度、景观均匀性指数等景观生态学指数,采用层次分析和模糊评判有机结合的综合方法,从生态安全状态、压力、响应三个指标体系角度出发,具体分析了屋檐洞库区自然、社会、经济三方面的生态安全问题,对库区生态安全进行综合评价,评判出屋檐洞水库库区系统生态安全属于安全级别,并根据评价中间结果找出生态安全响应是洛塔中寨水电站建设的潜在生态危险因素,提出建立合理科学的生态补偿机制以及库区生态安全预警系统等对策.     

曙光雷达数据处理软件系统

针对岩土工程探测对象的隐蔽性与复杂性,开发了曙光雷达数据处理软件系统,实现了不同类型雷达数据的共享数据处理、分形处理、偏移、联合反演、小波变换等功能;现场验证及试用结果表明,该软件系统可以改善地下目的物探测的分辨率和真实度,可为岩土工程施工提供较准确的地下障碍物资料。     

2007年中国大陆地震灾害损失述评

在列出2007年中国5级以上地震目录的基础上,结合有关省(自治区、直辖市)地震局的地震灾害评估资料,总结出2007年中国大陆地震灾害的主要数据和特性。最后列出1990—2007年中国大陆地震灾害的相应数据,并进行了简要的比较。