双乙烯酮的环保生产

介绍了双乙烯酮的生产工艺,研究了双乙烯酮生产中"三废"的产生及综合利用,讨论了双乙烯酮的环保生产。     

双乙烯酮的生产及应用

介绍了双乙烯酮的性质，重点介绍了烯酮的生产方法和双乙烯酮及其衍生产品在医药、农药、染料、食品添加剂工业等方面的应用。     

双乙酮及其衍生物的制备和应用

介绍了双乙烯酮的性质和制备方法，重点介绍了双乙烯酮及其衍生产品在医药、农药、染料、有机合成、食品添加剂和高分子工业等方面的应用。     

双乙烯酮及其衍生产品

介绍了双乙烯酮的性质、制备方法及其衍生产品用途，并分析了市场前景。重点叙述了双乙烯酮在有机合成、农药、合成染料及食品和饲料添加剂等方面的开发应用。     

双乙烯酮的合成与应用

介绍了双乙烯酮的合成方法:乙酸高温裂解法、乙炔氧化法、丙酮热解法和乙酸酐热解法。阐述了双乙烯酮在医药、农药、染料、饲料和食品添加剂方面的应用。     

双乙烯酮及其衍生产品

介绍双乙烯酮的性质和制备方法,重点介绍双乙烯酮在医药,农药、染料、有机合成、仪器和饲料添加剂、高分子工业等方面的应用。     

双乙烯酮生产技术进展

介绍了双乙烯酮的主要生产方法。从生产工艺、"三废"处理以及分离技术等方面概述了双乙烯酮生产技术的研究进展,提出了今后的发展方向。     

双乙烯酮生产技术研究进展

介绍了醋酸法生产双乙烯酮技术现状,从生产工艺、"三废"处理、分离技术以及装置设备等方面概述了双乙烯酮生产技术的研究进展,提出了今后的发展方向。     

双乙烯酮在农药领域的应用

双乙烯酮的高度不饱和性使其具有一些特殊的物理性能和较高的反应活性,在农药领域的应用极广。介绍了由双乙烯酮直接合成或由其衍生物合成的农药品种。     

化工实用技术资料

064 双乙烯酮及其衍生物的制备和应用 介绍了双乙烯酮的性质和制备方法,重点介绍了双乙烯酮及其衍生物在医药、农药、染料、有机合成、食品添加剂和高分子工业等方面的应用。 065 乙二醛生产技术及供需状况 介绍了乙二醛生产技术现状与发展动向以及市场需求预测。 066 乙二醛的生产应用和市场前景 介绍了乙二醛的性质、制备方法及应用情况,并对其前景作了展望。 067 乙醛法生产乙二醛的工艺研究 研究了乙醛硝酸氧化法生产乙二醛中各工艺参数对乙二醛收率的影响,提出了较适宜的工艺条件,收率可达40％以上。     

SBS和SBS环氧化与顺酐化研究

SBS是(苯乙烯-丁二烯-苯乙烯)三嵌段共聚物，是含有聚苯乙烯玻璃化微区及聚丁二烯连续相的多相聚合物，具有热塑性橡胶的性质。它具有良好的拉伸性能、耐湿性、透气性、溶解性及抗滑性，而被大量用于橡胶制品、粘舍剂及沥青和树脂的改性剂等。其缺点是耐油性差，与极性物质不相容，不粘接等。用环氧化及顺酐化改性可改进这方面的缺点。SBS的环氧化改性多半使用过甲酸或过乙酸在溶液中进行。产物可作为压敏胶、热熔胶、密封胶等，用于粘接极性材料，也可作为耐油热塑性橡胶。SBS的顺酐化改性可在熔融态进行，也可在溶液中进行。产物可用作极性聚合物与非极性聚合物的共混增容剂、胶粘剂及进一步合成离聚体。     

壳寡糖的制备、分离分析方法及在农业上的应用

壳寡糖具有独特的生理活性和功能性质,在多个领域有广泛的用途,尤其是在农业中作为植物病原菌生长抑制剂、土壤修复剂、产生诱导抗性等,逐渐成为国内外关注热点。其主要的制备方法有化学法、酶解法和物理法。分离方法主要有色谱柱分离法、膜分离法、酶法。分析方法有高效液相色谱法、质谱分析、核磁共振和红外光谱。     

Bioactivity and osteoinductivity of glasses and glassceramics and their material determinants

Bioactive glasses and glassceramics have been used in both bone repair and tissue engineering applications. An important feature of bioactive glasses and glassceramics, which enables them to be used for desired application, is their biological activity. This activity is manifested by the ability of these materials to form a stable bond with bone tissue (bioactivity) and, in some cases, their ability to promote/initiate osteogenesis (osteoinductivity). A stable material-bone bonding (i.e. bioactivity) results from specific material surface reactions leading to hydroxyapatite (HAp) formation on the material surface. Bioactivity of materials is often evaluated in vitro and the ability of materials to form HAp-like surface layer is usually studied after immersion/incubation of materials in simulated body fluid (SBF). Biological activity of materials can be also defined as their ability to induce specific cell responses leading to faster regeneration of bone tissue. It may be manifested by materials supporting bone cell attachment, proliferation and differentiation (biocompability/osteconductivity), and/or by materials inducing/promoting the expression of multiple bone-related genes that drive osteogenesis (osteoinductivity). Osteoinductivity is often verified in vivo by the materials capability to form bone at etopic (i.e. extraskeletal) sites. However, a lot of in vitro call-based experiments are now offered to determine osteoinductive properties of biomaterials. This review focuses on the silica-based glasses and glass-ceramics, in particular, the sol-gel derived ones, and summarizes their bioactivity and osteoinductivity as major determinants of their biological activity. We highlight the chemistry of bioglasses and glassceramics that affects not only the formation of a stable implant/bone bonding by HAp layer, but also drives the cell response in vitro and in vivo.     

油气管道及储运设施安全保障技术发展现状及展望

相比已经完善丰富的开采和勘探技术,油气的运输以及储存却仍然存在不足之处。我国对能源安全提出更加严格要求的同时,对区域经济的发展规划也有足够重视。因此,保障油气管道的安全则成为了我国能源安全战略的重中之重。在阐释油气管道现阶段在储运安全保障技术发展状况的基础上,分析了现存的问题及解决问题的手段,并指出未来可能使用的目标策略,为今后研究者提供一定程度上的借鉴经验。     

Cracking and dehulling shriveled and wrinkled soybeans

Midwest drought conditions in 1988 resulted in soybeans with shriveled and wrinkled seed coats. Processors expressed concerns about the processing of such misshapen seeds. The objective of this research was to determine the cracking and dehulling properties of shriveled and wrinkled (S/W) soybeans. Five lots of soybeans, two sound lots and three containing shriveled and wrinkled seeds, were cracked and dehulled, as were the sized and sorted fractions of these lots. Processing variables (% aspiration liftings, fiber removal in the liftings, % fines in the liftings, protein recovery, oil recovery, meats size distribution and oil-free meats fiber content) indicated significant differences between whole sound lots and whole lots containing S/W. There were differences in processing properties between these three types of soybeans (from best to worst)-sound soybeans from sound lots, sound soybeans from lots containing S/W beans and S/W soybeans. Size had an effect on processing; smaller beans did not process as well. The economic impact of S/W conditions was estimated by using a simulation model of soybean processing. Although the presence of S/W soybeans affected cracking and dehulling properties, it had a negligible effect on the Estimated Processed Value per Bushel (EPVB). Calculated blends of sound and S/W lots containing 20% S/W seeds had a decrease in EPVB of less than 0.2%.     

蔬菜水果中硝酸盐与亚硝酸盐的测定及其储藏过程中的含量变化

文章采用离子色谱法/电导检测器,测定了蔬菜水果样品中的硝酸盐和亚硝酸的含量。实验选取并优化样品前处理方法,获得无色透明的溶液后,经0.45μm过滤器过滤后得到待测液,最后自动进样,离子色谱法进行样品测定,以10 mmol/L KOH溶液为淋洗液,相对标准偏差：NO3-为0.38%,NO2-为0.54%;回收率：NO3-为98.8%～99.7%,NO2-为98.6%～99.9%。本方法操作简便快速,且具有仪器稳定性好、测定结果准确可靠的特点。在被测定蔬菜水果中,硝酸盐和亚硝酸盐含量都在较低浓度水平,NO3-：16.8～21.9 mg/kg,NO2-：0.0887～0.164 mg/kg。最后讨论了几种蔬菜水果样品储藏过程中硝酸盐与亚硝酸盐的含量变化情况。     

油气田开发建设与环境影响

油气田的开发建设一直是我国石油行业中的重中之重。随着我国石油行业的快速发展,各项领域对石油与天然气的需求也越来越大。但是,随着石油与天然气的大力开采,对环境产生了不良的影响。对此,通过对油气田的开发、油气田开发建设对环境的影响以及环境的保护对策等方面进行了简略的说明,希望对我国以后油气田开发建设有一定的指导作用。     

Oxytocin and Bone: Review and Perspectives

Recent data demonstrate the anabolic effect of oxytocin on bone. Bone cells express oxytocin receptors. Oxytocin promotes osteoblasts differentiation and function, leading to an increased bone formation with no effect on bone resorption and an improvement of bone microarchitecture. Oxytocin is synthetized by osteoblasts, and this synthesis is stimulated by estrogen. Animal studies demonstrate a direct action of oxytocin on bone, as the systemic administration of oxytocin prevents and reverses the bone loss induced by estrogen deficiency. Although oxytocin is involved in bone formation in both sexes during development, oxytocin treatment has no effect on male osteoporosis, underlining the importance of estrogen that amplifies its local autocrine and paracrine secretion. There are few human data showing a decrease in the oxytocin serum level in anorexia nervosa independently of estrogen and in amenorrheic women associated with impaired bone microarchitecture; in post-menopausal women a higher oxytocin serum level is associated with higher bone density, but not in osteoporotic men. Oxytocin displays many effects that may be beneficial in the management of osteoporosis, cardiovascular diseases, cognitive disorders, breast cancer, diabetes and body fat gain, all age-related diseases affecting elderly women, opening exciting therapeutic perspectives, although the issue is to find a single route, dosage and schedule able to reach all these targets.     

刍议油气储运设备的管理与维护

在我国经济发展过程中,油气运输具有重要作用,为我国的发展提供能源支撑。现阶段,为了合理的分配油气等燃料物质,我国主要采取管道运输的方式来实现油气的储备与运输。在储运过程中,由于油气容易受到周边环境的影响,且本身具有氧化物质,容易出现管道腐蚀等现象。所以,在油气燃料物质储运过程中,必须做好管道防腐工作,不断改良输送管道,有效提升油气燃料的安全性,促进我国经济的快速发展。     

乙苯,苯乙烯的生产及合成乙苯,苯乙烯催化剂的研究进展

苯乙烯是重要的石油化工原料。本文介绍了国内外苯乙烯生产的发展概况，合成乙苯，苯乙烯所用的催化剂种类，并就苯乙烯生产及催化剂的发展趋势提出了自己的观点。