基于催化重整脱氯的轴金属高分子材料制备新工艺

高分子材料是我们在生产以及生活的过程中比较常用的一种化学的合成材料,对我们日常的生产以及生活非常重要,起着不可替代的作用,高分子材料一般为人工的制造,传统的制造的模式往往存在着这样或者那样的不足,所以,近些年,我国的许多的科学家通过积极地学习新工艺以及对高分子材料的研究,创造了许多的新的方法,本文主要的讲述基于催化重整脱氯的轴金属高分子材料制备的新工艺的相关的概念。     

自然铜矿石样品的加工及分析测试方法研究

矿石中含有多种天然物质,矿采对于矿物质的的测定十分重要,有效的开采所需要的矿物质,可以节省大量的人力物力,同时也关系到日后的资金收益。现代社会正处于稳定发展的阶段,所以对矿产的需求比较高,例如电子产业,军事科技等等。有效的利用已开采的矿物质,去除其中的杂质是十分重要的。一块普通的矿石中,往往含有多种杂质,精确的分析其中的化学元素可以更加准确的确定其开采地的矿物质的基本成分。取样是测定的基本前提,铜矿石的元素测定是对矿石本身而言。所以找到有代表性的样品具有重要的意义。本文简述了自然铜矿石的样品加工及其分析的方法。     

浅谈矿产资源的开发与地质环境保护

近年来我国社会的发展过程中,我国的矿产的产值,不断的提升,带来了较大的经济效益,但是随着开采量的不断的增加,给环境带来的污染是不可忽视的。党在十八大提出,要以文明的生态环境,作为宏伟的目标,指出了要将建设生态的文明,放在十分重要的位置上,文章针对矿产资源的开发,地质环境的关系,提出指导性的建议。     

数控机床智能化的主要技术特征

随着时代和科技的不断进步,数控机床技术的发展不断的优化和完善,整体的数控机床的发展趋势逐步向智能化发展。而对于数控机床的技术的开发和应用也逐渐的受到相关的机床生产商和采购者的重视。因而从实际上来讲数控的智能化发展不仅对机床所加工的产品的质量有一定的影响,对于加工的效率的影响也是比较大的。在此基础上,本文将对数控机床智能化的主要技术特征进行有效的分析和研究,从而使得数控机床技术能够更加健康的发展和进步。     

关于端电设备制造和维修的几个问题

整流机组是整流供电的核心设备。对于整流机组而言，合理的方案选择，精良的设计制造，正确的使用操作，以及到位的维护保养是其安全运行的基本保证。方案选择得不合理和设备制造中存在缺陷造成了先天的隐患。不正确的操作和缺乏及时到位的维护会产生后天的祸患。尽可能地排除先天的隐患，避免后天的祸患就是我们要研究的问题和要做的工作。维护检修是其中一项重要的工作。及时到位的维护检修可以发现和排除设备的隐患，保证设备处于良好的状态。即使是很好的设备，缺乏必要的维护保养也是会出问题的。本文重点就供电整流设备的维护和检修问题，结合抚顺铝厂的经验并参照国外公司的产品说明，谈谈个人的粗浅看法。     

马克思感性的自然概念及当代启示

马克思的自然概念是一个具有多重维度的整体性概念.马克思感性的自然概念全面地阐述了人与自然、历史与自然、自然科学与人文科学的辩证统一关系.感性的自然强调的是自然与人的相关性;人化的自然是对人与自然之间认识和实践的对象性关系的概括;历史的自然是对在生产实践基础上历史与自然统一的关系的概括;人本学的自然是对自然科学与人文科学的辩证统一关系的说明;价值的自然是对人与自然之间存在着满足与被满足、需要与被需要的价值关系的概括.马克思的感性自然概念对于理解与建设生态文明具有多方面的启示.     

浅谈环境艺术设计中的水景设计

本文从实际操作的层面探讨了环境艺术中重要的一个环节水景的设计工作.丈中已经充分的说明了水景设计是我们人类在生存的地表与其他的一些因素的构成关系所推行的整体性的研判,从这里面找寻出我们人类与大自然和谐共处的发展模式,减少我们人类的行为对于环境的种种破坏,让我们的生态环境能够得到及时的改善,加强我们人类的文明价值,实现人与自然的和平相处.     

浅谈英语课堂的有效教学

提高课堂教学的有效性,精心设计生动的、富有情趣吸引力的、形式多样的活动。教学的有效性是教学设计的生命,是学校教学活动的一个基本追求,它直接关系到教学的质量和人才的培养。加强教师自身素质的提高是课堂教学的有效性的重要前提,教师本身的能力高低会直接的影响到课堂教学质量。     

马克思主义视域下人性的二重性解读

在人性的问题上,马克思主义之前的哲学往往用静止的、孤立的、片面的、抽象的、形而上学的思维方法来解读人性.马克思主义哲学以实践为出发点,运用辩证的思维方式,对人性作出了全新的二重性的解读,认为人性是全面的、发展的、辩证的,是矛盾的统一体,是能动与受动、客观与主观、具体与抽象、变与不变的统一,是一个系统的、开放的、复杂的有机整体.     

部分城市生产资料价格周报

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Relationship of premorbid mass and energy intake to increase of body mass during the treatment of anorexia nervosa

We studied 152 healthy pregnant women and their 156 newborns for markers of hepatitis B virus (HBV) infection in Dakar, Senegal. Of these, 120 mothers (79%) had antibodies to the hepatitis B core antigen (anti-HBc), 21 (13.8%) were hepatitis B surface antigen (HBs Ag) positive, including 2/21 (9.5%) hepatitis B core-associated antigen (HBe Ag) positive and 1/21 (4.7%) HBV DNA positive. At birth, 11 (7%) infants were HBs Ag positive; 9/11 had an HBs Ag positive mother. Ten of these HBs Ag positive-born infants were investigated at 6-7 months: 5 were strongly HBs Ag positive and developed antibodies to HBs Ag, HBc Ag or HBe Ag; these 5 (3.2% of the total) probably became chronic carriers of HBV. The 5 others were HBs Ag negative and 4/5 did not develop antibodies against HBV Ag; HBs Ag positivity at birth was likely due to contamination of the mother's blood. Thirty-one of the 145 HBs Ag negative-born infants were studied at 6-7 months and remained HBs Ag negative. However, 5 (16%) showed evidence of HBV infection occurring between 0 and 6 months, as shown by the development of antibodies to HBs Ag, HBc Ag, and/or HBe Ag. Despite the low prevalence of HBV DNA and HBe Ag in HBs Ag positive African mothers, this study shows the occurrence of perinatal transmission of HBV in West Africa, in contrast with previous studies. Perinatal HBV transmission could explain the HBV vaccination failure recently reported in children in Senegal.     

Ag含量对WC-12Co/Ag涂层高温摩擦性能的影响

采用超音速火焰喷涂技术制备了三种不同Ag含量(10%,15%和20%)的WC-12Co/Ag涂层,将其高温摩擦性能与WC-12Co涂层进行对比。通过微观检测手段分析了Ag在涂层中的分布形态;检测了500℃,不同载荷(50N,100N,150N和200N)条件下,WC-12Co/Ag涂层摩擦因数随摩擦行程增加而变化的情况;并观察了涂层高温摩擦试验后磨痕微观形貌以及Ag元素的分布状态。试验结果表明:Ag元素在涂层中均匀分布,涂层中的Ag主要以单质的形式存在;在500℃条件下,当Ag含量大于15%时,Ag元素在磨损界面处形成一定厚度的连续润滑膜,起到良好的自润滑作用。     

Production of the 19-kDa antigen of Mycobacterium tuberculosis in Escherichia coli and its purification

The 19-kDa antigen (19Ag) of Mycobacterium tuberculosis (Mt) is a lipoprotein which is released from the organism during growth. In order to study the possible involvement of this antigen in the host protective response against Mt infection, it would be helpful to obtain high-level production of 19Ag from a recombinant organism. We have found that overexpression of the native 19Ag gene in Escherichia coli or yeast leads to products which are aggregated and insoluble. By site-directed mutagenesis of the 19Ag lipoprotein leader sequence, we have generated a mutant gene which directs the production of 19Ag into the periplasmic space of E. coli, from where it can be easily purified in high yield. 19Ag obtained from this mutant construct lacks the lipid-modified N-terminal Cys residue found in the native 19Ag, and is not glycosylated, but is otherwise indistinguishable from 19Ag isolated from Mt culture supernatant.     

Histopathologic and immunohistochemic correlations in virus B chronic hepatitis

Complete diagnosis of chronic hepatitis relies on exploring the liver by bipsic punction, performing the classic histopathologic and immunohistochemic exams. We worked out viral antigens hepatocytes by using avidin-biotin-peroxidase complex technique as following: Ag HBs placed in cytoplasm or at the level of the cell membrane. Ag HBc preferably placed in nucleus and, a small part of it, in cytoplasm. Ag HD present especially in nucleus. A correlation between tissular antigen expression and hepatic histopathologic aspect was established. Two main types of viral expression were remarked: a regressive type reflected by cytoplasmatic Ag HBs in the absence of generalised nuclear Ag HBc--situations linked to persistent chronic hepatitis: an aggressive type characterised by the presence of the focal nuclear Ag HBc, cytoplasmatic Ag HBc or antigen HD--situations linked to active chronic hepatitis with various degrees of severity.     

碳氢化合物湿法处理锰银矿应用研究

研究了碳氢化合物浸锰-氰化浸银工艺原理、条件和应用,当控制锰浸出率96%时,银的浸出损失率<2%;浸锰渣采用氰化法提银,NaCN用量1kg t渣、浸出时间3h时,银浸出率94 15%;浸锰-氰化两步浸出银的回收率大于92 27%。     

Influence of silver content and MnSO4 addition on performance of different lead–silver alloys during polarisation and decay periods

Abstract

The electrochemical activity and the corrosion properties of five commercial lead anodes were examined by the conventional polarisation methods and the electrochemical impedance spectroscopy method. The results show that the anode Pb–0·62Ag alloy had a lower overpotential for anode reaction than the others. The corrosion resistance after polarisation of the anode Pb–0·62Ag alloy was higher than that of the Pb–0·29Ag–0·1Ca alloy, Pb–0·58Ag alloy and Pb–0·67Ag alloy, but lower than that of the anode Pb–0·72Ag alloy. However, the anode Pb–0·72Ag alloy had the highest overpotential. When anodes Pb–0·72Ag alloy and Pb–0·62Ag alloy were used, the cathode current efficiencies were higher, while anodes Pb–0·29Ag–0·1Ca alloy, Pb–0·58Ag alloy and Pb–0·67Ag alloy gave lower current efficiency. Regarding these several factors, the anode Pb–0·62Ag alloy is the best choice.

On a examiné l’activité électrochimique et les propriétés de corrosion de cinq anodes commerciales en plomb, au moyen des méthodes conventionnelles de polarisation et de la méthode de spectroscopie d’impédance électrochimique. Les résultats montrent que l’anode de Pb–0·62Ag avait une surtension plus basse que celle des autres pour la réaction de l’anode. La résistance à la corrosion après la polarisation de l’anode de Pb–0·62Ag était plus élevée que pour l’anode de Pb–0·29Ag–0·1Ca, l’anode de Pb–0·58Ag ou l’anode de Pb–0·67Ag, mais plus basse que celle de l’anode de Pb–0·72Ag. Cependant, l’anode de Pb–0·72Ag avait la surtension la plus élevée. Lorsqu’on utilisait les anodes de Pb–0·72Ag ou de Pb–0·62Ag, le rendement du courant de la cathode était plus élevé, alors que les anodes de Pb–0·29Ag–0·1Ca, de Pb–0·58Ag et de Pb–0·67Ag donnaient un rendement de courant plus bas. Par rapport aux divers facteurs, l’anode de Pb–0·62Ag constitue le meilleur choix.     

Distribution and characteristics of hepatitis B surface antigen in body fluids of institutionalized children and adults

Specimens of blood, feces, urine, and nasopharyngeal washings collected at regular intervals from subjects in an institutionalized population were tested for the presence of hepatitis B surface (HBS Ag) and antibody by passive hemagglutination, radioimmunoassay, and immune electron microscopy. HBS Ag, confirmed by radioimmunoassay and immune electron microscopy, was frequently detected in nasal washings, urine, and feces of chronic carriers of HBS Ag and occasionally in subjects with recent seroconversion for HBS Ag. In addition, some subjects who had recently become positive for antibody to HBS Ag in serum had HBS Ag transiently present in urine and occasionally in the feces, without demonstrable antigenemia.     

湿法炼锌渣中银的回收

在湿法炼锌工艺中锌精矿中的银主要富集在酸性浸出渣中,此矿样的浸出渣中Ag的品位约为234 g/t,还含有Zn、Pb等可重复利用金属,研究Ag、Zn、Pb等的回收再利用具有十分重要的意义。本文以酸性浸出渣为原料进行了物理分选、还原焙烧、直接熔炼法以及氧化焙烧-氰化提银的试验,重点研究了物理分选过程Ag、Zn、Pb的富集走向及氧化焙烧-氰化提银工艺中氯化钠用量、焙烧时间及温度对Ag浸出率的影响。研究得出:高温高酸浸出后浮选可使Zn和Ag得到富集;浸出渣酸浸后熔炼使粗铅中的Ag和Pb富集,Ag品位可提高6倍;并通过试验得到了较优的氧化焙烧和氰化浸出提银工艺参数。      

Delayed maturation of the interstitial cells of Cajal: a new diagnosis for transient neonatal pseudoobstruction. Report of two cases

BACKGROUND: Previous studies have suggested altered responses to repeat skin tests in the sites of IgE-mediated late-phase reactions (LPRs) induced within the previous 48 hours. To explore the possible modulation of LPRs in such rechallenge sites, we compared inflammatory responses in skin chambers induced over previous LPR and control sites. METHODS: Skin blisters were induced and unroofed in 12 human subjects over two sites of previous LPRs induced by intradermal injection of pollen antigens 24 hours or 48 hours earlier and two sites previously injected with buffer diluent (B). Skin chambers containing the same antigens were appended to one intradermal antigen site (called Ag/Ag) and one intradermal B site (B/Ag), and B-containing chambers were placed over antigen (Ag/B) and B (B/B) intradermal sites. Fluids were collected after the first and the second through fifth hours of challenge. RESULTS: In skin chamber challenges 24 hours after the intradermal injection, there was no significant difference after the first hours between the Ag/Ag or B/Ag sites in either histamine or tryptase levels; both were significantly higher than at Ag/B or B/B sites (p < 0.01). The same pattern of events was seen in fluids obtained from the second through fifth hours. The same pattern of findings was seen in examination of levels of the total leukocyte accumulation, total eosinophil accumulation, and frequency of activated (EG2+) eosinophils. Levels of lactoferrin, released from activated neutrophils, and eosinophil cationic protein, released from activated eosinophils, were also similar at Ag/Ag and B/Ag sites; both were significantly higher than at B/B sites, whereas levels at Ag/B sites were intermediate between those found at B/Ag and B/B sites. The pattern of events in skin chamber challenges 48 hours after intradermal injection was similar to that seen at 24 hours, except that levels of inflammatory mediators/cells in Ag/B sites were more intermediate between the B/Ag and B/B sites. CONCLUSION: There is no significant alteration of mediator or inflammatory cell responses after antigen rechallenge of previous LPR sites when compared with those found in antigen challenge of non-LPR sites.     

High resolution transmission electron microscopy studies of the Ag/MgO interface

Ag layers with a thickness of 100 nm were deposited on {100} MgO substrates by molecular beam epitaxy (MBE). The substrates were produced by cleaving MgO single crystals and subsequent annealing in ultra high vacuum. X-ray texture measurements indicate a preferential orientation of Ag {100} planes parallel to the {100} surface of the MgO substrate. The atomistic structure of the Ag/MgO interface was imaged by high resolution transmission electron microscopy (HRTEM). Lattice images of Ag and MgO in parallel orientation show structural defects and lattice strain at the Ag/MgO interface, which are introduced by the lattice mismatch of 3% between Ag and MgO. The atomic resolution images are compared with the computer-simulated lattice image of a model structure. Finally our atomistic model of the Ag/MgO interface, which includes a misfit dislocation network is discussed in connection with theoretically calculated interfacial energies.