基于Kriging插值的数字地图生成算法研究

提出基于Kriging法进行水深数据插值形成规则网格数字高程模型的算法,对海底数字地图的模拟具有重要参考价值,是海底地形匹配定位技术研究的关键.数字仿真结果证明该算法可行.     

碳含量和浸泡时间对碳钢热带自然海水腐蚀产物中细菌组成的影响

为了深入探讨海洋微生物对碳钢的腐蚀机理,通过细菌的分离鉴定方法,研究了不同碳含量碳钢在自然海水中浸泡不同时问后腐蚀产物中的细菌组成。结果表明不同碳钢每克表面刮取物中需氧菌及兼性厌氧菌的数量均在浸泡时间为91d时达最大值,而硫酸盐还原菌的数量在浸泡时间为184d时达最大值。铁细菌和硫细菌的变化不明显。不同碳钢,除7d实验周期外,随碳含量增加,腐蚀产物中需氧菌及兼性厌氧菌有增加趋势,而硫酸盐还原菌却存在降低趋势。需氧菌及兼性厌氧菌主要由两个菌属的细菌组成,即假单胞菌属和弧菌属,当浸泡时间达1a时,还出现大量黄杆菌。从各个菌属所占比例可见,碳钢腐蚀产物中菌群初期主要由需氧菌组成,随着浸泡时间延长,兼性厌氧菌开始占据主要地位。铁细菌主要是由瑙曼氏菌属和鞘铁菌属组成。不同细菌在生长过程中对氧的需求与消耗及代谢产物的差异,会对碳钢的腐蚀过程产生不同的影响。     

Arsonoliposome interaction with thiols: effect of pegylation and arsonolipid content of arsonoliposomes on their integrity during incubation in glutathione

Increased toxicity of arsonoliposomes towards cancer cells may be attributed to interaction between arsonolipids and cellular thiols which, would result in reduction of As(V) to the more toxic As(Ill). Cancer cells with high thiol contents may thus be more sensitive to arsonoliposomes, providing that the arsonolipid molecules that are incorporated in the liposome membrane can interact with thiol-containing compounds. For examination of this possibility we investigate the effect of incubating various compositions of arsonoliposomes with glutathione, on their integrity. If glutathione does interact with the As(V) of the arsonolipid headgroup, this should result in an alteration of the arsonoliposome membrane stability. We followed arsonoliposome integrity by measuring the release of vesicle-encapsulated calcein from arsonoliposomes with different lipid compositions, during incubation in glutathione. The results of this study show that the effect of glutathione on arsonoliposome integrity is higher (arsonoliposomes are less stable) when the arsonolipid content of their membranes increases. This indicates that arsonolipid molecules interact with glutathione, and in some cases, depending on the rigidity of their membranes; this interaction leads to a (higher or lower) destabilization of arsonoliposomes. The destabilizing effect of glutathione was higher for arsonoliposomes that were previously found to be less stable during incubation in serum proteins or, in other words, have lower membrane rigidity. In the case of pegylated-arsonoliposomes membrane destabilization was minimal and this may be related to the high stability demonstrated previously for these specific arsonoliposomes, or, it may indicate that pegylation results in prevention (total or partial) of arsonolipid-As interaction with thiols (perhaps because of steric repulsion).     

基于C/S+B/S混合模式的民航适航管理系统

根据民航适航管理工作的信息化建设和政府上网工程建设的需求,设计和开发了一个基于C/S与B/S混合模式的适航信息管理系统。并在民航海南安监局适航管理工作得到了应用。重点对系统功能、系统安全性技术进行了描述,如数据同步、基于角色的权限控制、基于表单的身份认证、口令加密等。     

Guidance method to use mixed coal in blending for coking

Based on the principle that the adaptation can be reflected by the overlap of reflectance distribution peaks,the effect of various types mixed coal for coking is analyzed.Based on the action of the vitrinite of different reflectance range and the adaptation,a new method for guidance blending coal is established.Through simulation,blending coal using the software of HD automatic microscope photometer,makes the synthetic blending coal reflectance distribution map to nothing notch wide single peak flat-shap...     

牡蛎肉的加工利用研究进展

牡蛎是我国重要的食用水产品资源,具有丰富的营养价值和药用价值。本文分别就牡蛎肉的干制、罐头加工、调味品加工、发酵饮品加工、活性肽的提取、牛磺酸提取、糖原提取、多不饱和脂肪酸提取和牡蛎净化等方面综述了牡蛎肉的加工利用技术研究现状,并对牡蛎肉的加工利用发展方向进行探讨。     

Ascent and descent rates of high-flying insect migrants determined with a non-coherent vertical-beam entomological radar

Vertical-beam radars employing non-coherent transmission and reception provide an effective means of detecting insects migrating at heights of hundreds of metres. Current units can determine the insects’ horizontal velocities, orientations, and some characteristics indicative of the targets’ identities; however, they are not able to detect the vertical component of the targets’ motion. It has generally been presumed that more sophisticated radar technology, employing Doppler processing and requiring coherent operation, would be needed to observe ascent and descent of targets, but we show here that with modern, high-speed, data-acquisition technology it is possible to determine these quantities from the echo signals produced by current non-coherent transceivers. A specially developed data-analysis algorithm that extracts precise target ranges from each of the radar’s pulses and calculates averages over multiple samples forms an essential component of this new capability. An upgraded Insect Monitoring Radar (‘IMRU’) incorporating these elements can estimate target heights with a precision of 0.13 m up to heights of 1 km (and 0.2 m from 1 to 2.5 km), and it does so every 0.13 s. This allows ascent and descent rates to be estimated to a precision of 0.4 m s^?1 at lower altitudes and to 0.1 m s^?1 at the greatest heights, where the broader beam produces echoes with longer duration. Brief case studies are presented that show IMRU observations of ascending and descending insects in daytime convective thermals, around dusk (when nocturnal migration commences with a take-off flight), during an established nocturnal migration, and at the leading edge of a mesofront. Some limitations and potential biases of the method are identified, and its utility relative to alternative methods is considered.     

螺旋藻珍珠粒饮料的制作技术

对螺旋藻珍珠粒饮料的制作技术进行了较深入了研究，试验结果表明，用焦磷酸钠对螺旋藻进行破壁，用硫酸铜对螺旋藻进行护色，用乙醇，β－ＣＤ等对螺旋藻进行了脱腥，用海藻酸钠进行了造粒，添加适量的糖，蜂蜜，经过密封杀菌后可以制成色彩艳丽，外观新颖，风味良好的螺旋藻彩色珍珠粒饮料。     

应用数据卫士实现数据库灾难保护

文章在对目前烟草行业信息化建设中如何保障数据的安全、防止数据库灾难性瘫痪,保证系统的连续有效运转等问题进行深入分析的基础上,提出了在减少投资成本的基础上,对数据库系统进行灾难性保护,实现系统不间断运转及数据安全的有效途径。并经过应用Oracle 9i数据库系统的大量实践,成功实现了数据卫土(data guard)对数据库系统的灾难性保护。      

Does the lipid membrane composition of arsonoliposomes affect their anticancer activity? A cell culture study

Sonicated arsonoliposomes were prepared using arsonolipid with palmitic acid acyl chain (C16), mixed with phosphatidylcholine (PC)-based or 1,2-distearoyl-sn-glycero-3-phosphocholine (DSPC)-based, and cholesterol (Chol) with C16/DSPC/Chol 8:12:10 molar ratio. PEG-lipid (1,2-distearoyl-sn-glycero-3-phosphoethanolamine conjugated to polyethylenoglycol 2000) containing vesicles (PEGylated-arsonoliposomes; PC-based and DSPC-based) were also prepared. The cytotoxicity of these arsonoliposomes towards different cancer cells (human promyelocytic leukaemia NB4, Prostatic cancer PC3, human breast adenocarcinoma MDA-MB-468, human T-lymphocyte (MT-4) and also towards human umbilical vein endothelial cells (HUVECs) was evaluated by calculating the arsonoliposome-induced growth inhibition of the cells by the MTT assay. IC-50 values were interpolated from cell number/arsonoliposome concentration curves. The results reveal that all types of arsonoliposomes evaluated significantly inhibit the growth of most of the cancer cells studied (PC3, NB4, MT4) with the exception of the MDA-MB-468 breast cancer cells which were minimally affected by arsonoliposomes; in some cases even less than HUVEC. Nevertheless, for the same cell type the differences between the different types of arsonoliposomes were significant but not proportional to their stability, indicating that the formation of arsonoliposomes with very stable membranes is not a problem for their anticancer activity. Thereby it is concluded that arsonoliposome composition should be adjusted in accordance to their in vivo kinetics and the desired, for each specific application, biodistribution of As and/or encapsulated drug.