Finishing works after welding of structures made of rust-resistant,high-alloy steels

In this paper, problems that occur when working with welds formed of high-alloy steels to restore their passive layers, damaged as a result of temperature impact, are discussed. Particular attention was paid to the procedures concerning aggressive etching agents during and after completion of the passivation processes (waste neutralization and utilization).     

Luminescent Amphiphilic Aminoglycoside Probes to Study Transfection

We report the characterization of amphiphilic aminoglycoside conjugates containing luminophores with aggregation-induced emission properties as transfection reagents. These inherently luminescent transfection vectors are capable of binding plasmid DNA through electrostatic interactions; this binding results in an emission “on” signal due to restriction of intramolecular motion of the luminophore core. The luminescent cationic amphiphiles effectively transferred plasmid DNA into mammalian cells (HeLa, HEK 293T), as proven by expression of a red fluorescent protein marker. The morphologies of the aggregates were investigated by microscopy as well as ζ-potential and dynamic light-scattering measurements. The transfection efficiencies using luminescent cationic amphiphiles were similar to that of the gold-standard transfection reagent Lipofectamine® 2000.     

赛络纺漂白大豆氨纶包芯纱的生产

为提高针织纱强力,改善针织面料的光洁度,漂白大豆氨纶包芯纱采用赛络纺工艺生产,并与传统的环锭纺漂白大豆氨纶包芯纱的成纱质量指标进行对比。通过采取各项措施,其强力、毛羽等主要指标优于传统环锭纺,且包覆效果良好,达到使用要求。     

四川盆地广元-梁平古裂陷构造-沉积演化

二叠纪-三叠纪转折期,四川盆地北部广元-梁平地区发育一个北西-南东向古裂陷,称之为"开江-梁平古裂陷"。由于对广元-梁平古裂陷的认识直接影响到川北和川东北地区的油气勘探部署,因此有必要对该古裂陷的构造-沉积演化进行深入研究。通过系统收集广元-梁平古裂陷槽内外的露头和钻井资料,并根据地层不整合面特征、沉积充填特征、测井曲线突变特征、沉积物地球化学特征等沉积记录以及地震剖面约束,发现广元-梁平古裂陷槽内仍存在茅口组三段(茅三段)和四段沉积物,槽内茅口组顶部缺乏广泛岩溶,表明茅口组减薄并非岩溶侵蚀造成,而是由相变导致的。广元-梁平古裂陷的雏形最早形成于茅三段和茅四段沉积期,吴家坪期在此基础上继承性发展,长兴期拉张裂陷活动加剧,热液活动加强,构造沉积分异明显,为古裂陷发育的高峰期,直至飞仙关组四段沉积期,古裂陷才完全被填平补齐。广元-梁平古裂陷对环裂陷槽中-上二叠统多层系储层具有明显控制作用,不仅控制着茅口组生屑滩储层的发育,还控制着吴家坪组颗粒滩储层的发育,且吴家坪组储层中存在油气运聚过程,发育残余孔隙,为下一步油气勘探的有利目标。     

Water Balance of the Upper Jordan River Basin

Sharing water in the Jordan basin has been a key topic in the recent peace talks between Israel and its neighbors. Knowing the quantity of water available is a prerequisite to water sharing. Many different values have been published in recent years. Different sources report Jordan's discharge flow into Lake Kinneret anywhere from 460 to 800 Mm³/year. The aim of this article is to present a water balance for the Jordan basin for a 15-year period. The years 1977–1978 to 1991–1992 were studied for the basin's water budget, as they represent the present day (1998) land use. The results show that Lake Kinneret has a yearly average input (= output) of 770 Mm³. Israel uses some 800 Mcm³/year from the entire Jordan basin, of which 440 Mm³ is used within the basin and the rest outside. There is about 100 Mm³ for future utilization in the watershed. The yearly Jordan's discharge to the Dead Sea is 220–250 Mm³. Reporting by various secondary data sources is compared to primary data findings to illustrate the great variability of data reporting and to provide annual flow estimates, based largely on primary sources, for the Upper Jordan River.     

XPS studies of perovskites surface instability caused by Ar+ ion and electron bombardment and metal deposition

X-ray Photoelectron Spectroscopy (XPS) was used to study the influence of low energy Ar⁺ ion bombardment, electron bombardment and Pt deposition on the SrTiO₃ (STO) single crystal electronic structure. Atomic composition changes were found and attributed to chemical reconstruction of the STO surface. A clear correlation between the presence of conducting, low Ti oxidation states in valence band and core level changes was detected. A strong effect caused by electron irradiation was ascribed to the electroreduction process. The influence of lanthanum doping on surface instability of STO was also discussed. The La doped sample (STO: 3,75% La) was found to be modified upon Pt metal deposition to a higher degree than pure STO crystal.     

125I标记紫杉醇的方法

摘要:采用改良的氯胺T法,先用稳定的NaI与紫杉醇作用,再以放射性Na125I标记紫杉醇(paclitaxel),建立了125I标记紫杉醇的方法。采用纸层析及HPLC测定标记产物的标记率、纯化后放射化学纯度,采用纸层析测定标记产物在不同温度、储存溶剂条件下的体外稳定性,红外光谱鉴定产物。改良Ch-T法所得标记产物的标记率与硝酸氧化法和传统氯胺T法相比较。结果显示,采用改良氯胺T法标记率约63.1%±5.7%,放射化学纯度约96.3%±1.3%;标记物储存于4℃生理盐水或乙醇储存体系中24h、120h,放化纯度分别＞95%和约90%;在血浆中稳定性也较好,在4℃ 、37℃放置24h,放化纯度分别为92.3%±0.4%、89.5%±0.6% 。以上结果表明,改良氯胺T法标记紫杉醇方法简便,标记率高,标记产物稳定性较好,能够满足放射性示踪实验的要求。     

Development and numerical validation of a new model for walls with phase change materials implemented in TRNSYS

This paper presents a model of a wall with variable properties dedicated to modelling phase change materials (PCMs) in building envelopes. The model is implemented in the TRNSYS simulation tool and referred to as Type 3258. The 1-D conduction heat transfer equation is solved using an explicit finite-difference method coupled with an enthalpy method to consider the variable PCM thermal capacity. This model includes temperature-dependent thermal conductivity and PCM-specific effects like hysteresis and supercooling. The stability conditions are discussed and the algorithm implemented in TRNSYS is described. A numerical validation performed on wall test cases proposed by the International Energy Agency is presented, showing that the developed model is in agreement with reference models. The paper also discusses the impact of temporal and spatial discretization on the model performance. Modelling problems encountered when using an effective heat capacity method (compared to an enthalpy method) and when representing supercooling are also discussed.     

Discrimination of Korean beef from beef of other origin by stable isotope measurements

Beef samples from Korea and from some of the main beef exporting countries (USA, Mexico, Australia, New Zealand) were analysed for carbon, nitrogen and hydrogen isotope ratios of the defatted dried matter. Results showed that the samples from each country investigated could be assigned to a typical isotope signature and can be separated from each other. The main discriminating factors were δ¹³C and δ²H, which mainly reflect feeding of C₃ and C₄-plants and the isotopic composition of the water, respectively, consumed by the cattle. Australian beef showed the largest variation in its isotopic signature, suggesting heterogeneous rearing conditions. By contrast, for beef from New Zealand, Mexico, USA and Korea, each batch had typical signatures with a smaller variability.