户畑3号烧结机的主排气循环系统的应用

在户第３号烧结机中运行了１７年的电除尘器明显老化，除尘性能降低，必须更新电除尘器。于是，考虑到将来控制环境污染和促进节能，于１９９２年１０月应用了能够大幅度减少需处理排气量、并且能够降低烧结烧成能耗的主排气循环技术。结果，对烧结的生产率和质量都没有大的影响，使２５％的烧结料层废气循环，成功地将气体从烟囱排出，减少了循环当量。由于这种排气量的减少，不需要循环当量的除尘能力，可以停用１台电除尘器。     

户Tian3号烧结机的主排气循环系统的应用

在户Ｔｉａｎ第３号烧结机运行１７年的电除尘器明显老化，除尘性能降低，必须更新电除尘器。于是，考虑到将来控制环境污染和促进节能，于１９９２年１０月应用能够大幅度减少需处理排气量，并有能够降低烧结烧成能耗的主排气循环技术，结果，对烧结的生产和质量都没有大的影响，使２５％的烧结料层废气循环，成功地将气体从烟囱排出，减少了循环当量，由于这种排气量的减少，不需要循环当量的除尘能力，可以停用１台电除尘器。     

烧结废气温度波动对机头电除尘效率的影响

为使烧结机头电除尘器稳定运行,提高除尘效率,分析了废气温度波动的原因,提出了控制烧结废气温度波动的具体措施。生产实践表明,烧结废气温度控制在100~135℃时,机头除尘器除尘效率提高了3%~8%,使用寿命大幅度延长。     

活性炭脱硫脱硝系统颗粒物排放的影响因素

活性炭脱硫脱硝系统可同步脱除烧结烟气中SO2、NOx、颗粒物、重金属等多种污染物,在烧结烟气治理过程中得到了广泛应用。介绍了活性炭的脱除机理及特性,重点分析了入口颗粒物浓度、脱硫脱硝系统中活性炭自产颗粒物、物料循环量、解析效果以及烧结过程电除尘器、烧结烟气循环系统、吸附塔进退模块对颗粒物脱除效果的影响,找到了颗粒物排放的有效控制方法。     

烧结钢烧结过程中的气氛控制及其对性能的影响(1)

烧结气氛的正确选择及其控制对烧结后部件的性能至关重要。这里所谓的控制主要是指对气氛中氧及碳浓度（含量的）控制，因为两者均对烧结的质量及其后部件的力学性能，烧结表面质量等具有决定性的作用。本文综述了PM钢烧结过程中所用的不同的烧结气氛，阐述了不同气氛的作用及其影响，着重分析了不同气氛中碳势及氧浓度的控制，并举例说明。     

烧结钢烧结过程中的气氛控制及其对性能的影响(2)

烧结气氛的正确选择及其控制对烧结后部件的性能至关重要。这里所谓的控制主要是指对气氛中氧及碳浓度（含量）的控制，因为两者均对烧结的质量及其后部件的力学性能、烧结表面质量等具有决定性的作用。本文综述了PM钢烧结过程中所用的不同的烧结气氛，阐述不同气氛的作用及其影响，着重分析不同气氛中碳势及氧浓度的控制，并举例说明。     

降低烧结机头粉尘排放浓度的生产实践

通过对电除尘器结构性能及烧结含尘废气组成的分析,确定烟气温度与湿度、烧结原料、系统漏风、除尘器内部故障为影响烧结机机头电除尘器运行效率的关键因素,生产实践中从上述4个方面来采取措施,使机头粉尘排放受控。     

高频电源在烧结电除尘器上的应用

烧结生产过程中,产生的主要污染物是粉尘,烧结粉尘治理以电除尘器为主要净化设备。电除尘器的排放浓度很难达到25～50mg／m2。本文论述了高频电源的原理、技术以及在钢铁行业降低排放的实际应用。     

烧结废气全净化系统的探讨

本文简要探讨了烧结废气净化系统的情况其主要内容包括；极细粉尘和ＳＯ２的净化，以及在烧结料中配加轧钢皮时的废气净化，作者担子同电除尘器及其防闷烧保护装置，干式喷雾脱硫装置和轧钢皮脱油装置三部分组成的全净化系统的设想。     

烧结烟气污染治理技术的研究与开发

概述了我国钢铁行业烧结烟气污染物产生和治理的基本情况,以及国外在烧结烟气污染物治理方面的总体状况.针对烧结烟气治理技术难题,阐述了宝钢在烧结烟气治理方面研究、开发的成套环境工程技术,烧结烟气脱硫技术和烧结机头电除尘器提效技术的成功应用,引起业内重视,带动了行业环保技术进步.并对今后烧结烟气污染物治理技术的发展提出思考建议.     

Technical features of a CCD video camera system to record cardiac fluorescence data

Prostaglandin E2 (PGE2) is a potent local mediator of cell growth and differentiation in various tissues. The receptors for PGE2 have been classified into four pharmacological subtypes, EP1, EP2, EP3, and EP4, based on the responses to selective agonists and antagonists. We have cloned a functional cDNA for the rat EP2 receptor subtype from a rat lung cDNA library. The rat EP2 receptor cDNA encodes 357 amino acid residues having high homology with the human and mouse EP2 receptors and containing seven putative transmembrane domains. In COS-7 cells transfected with rat EP2 cDNA, specific [3H]PGE2 binding was found with a dissociation constant of 14.9 nM, and this binding was inhibited by unlabeled PGE2 and PGE2 alpha. PGE2 and butaprost, an EP2 selective agonist, were effective in increasing the cAMP level in the COS-7 cell transfectants. Northern blot and RT-PCR analysis showed widespread distribution of the EP2 receptor in various tissues. Higher EP2 expression was found in fetal long bones and calvariae than in adult by RT-PCR and in situ hybridization, suggesting a role for this receptor in rapidly growing skeletal tissue.     

韶钢24m2烧结机尾SHWB型电除尘器的改造

分析了韶钢 2× 2 4m2 烧结机机尾 2 0m2 SHWB型电除尘器存在的问题。在现场条件受到限制的情况下 ,采用宽间距技术对其进行改造 ,收到了良好的效果。     

电除尘器在南(京)钢烧结机头烟气除尘中的应用

介绍了电除尘器在南京钢铁联合有限公司炼铁新厂180 m^2烧结机机头烟尘治理上的应用.分析了运行中存在的问题并介绍所采取的整改措施,总结了大型电除尘器用于烧结工艺除尘的经验.     

Influence of gonadal hormones and sexual behavior on ultrasonic vocalization in rats: I. Treatment of females.

Ultrasonic vocalizations were measured when male Long-Evans rats were placed with ovariectomized females that had experienced various hormonal and behavioral treatment. In Exp I, 18 males were tested with females in each of the following conditions: nonestrous (OVX), estrogen treated (E), estrogen and progesterone treated (EP), and estrogen and progesterone treated and given 2 intromissions from a stud male prior to testing (EPI). Control conditions included clean cage (CL) and cage soiled by an estrous female (SOI). The treatments differed in effect on rate and maintenance of vocalization, in the order of greatest to least: EP, E, EPI, and OVX (equal), SOI, and CL. In tests in which males produced a high rate of vocalization, some males with short intromission latencies shifted from the normal 50-kHz pulse to a 22-kHz pulse. In Exp II, the effect of the female's vocalization and movement on the rate of and latency to vocalization was measured. 21 males were presented with each of the following stimulus conditions: estrous female with red light (EP), estrous female without red light (EP dark), estrous anesthetized female (EP anes), and nonestrous anesthetized female (OVX anes). Effects on vocalization of various treatments were in descending order: EP and EP-dark (equal), EP anes, and OVX anes. Data suggest that the 50-kHz vocalizations constitute a graded response influenced by the female's hormonal and sexual condition. (16 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

声波清灰器在烧结机头电除尘器中的应用

鞍钢炼铁总厂针对二烧烧结机机头电除尘器振打装置存在的问题，采用辽宁中鑫自动化仪表有限公司生产的声波清灰器作为辅助清灰器进行增效改造，取得了很好的效果。本文介绍了声波清灰的原理、特点、清灰系统的构成及使用效果。     

电除尘器在马钢竖炉球团生产中的应用

介绍了马钢一烧3座球团竖炉的电除尘器系统及其运行情况。其中，1^#、2^#竖炉于2001年7月投产，2005年4月扩容为10m^2，并对其电除尘系统进行了改造。3^#竖炉于2004年5月投产，由于汲取了1^#、2^#竖炉的经验，其电除尘系统的设计和设备选型合理，投产顺利，取得了较好的效果。     

Effect of focal cochlear vascular lesion on endocochlear potential in guinea pigs

The alteration endocochlear potential (EP) in response to total cochlear ischemia induced by various experimental manipulations has been studied. However, the effect of restricted areal damage to the microvessels (restricted to small area in the lateral wall of a cochlear turn) on the EP value is still unknown. In the current investigation we adopted a photochemical method to produce a focal (i.e., restricted area) microvessel injury in the lateral wall of the guinea pig cochlea and examined the effect of these insults on EP recorded in the same region. The small area of the microvessel lesion (small fenestra: approximately 0.2 x 0.4 mm2) induced by photoactivation did not yield significant EP changes, suggesting that damage to such a small area of microcirculation in the lateral wall of the cochlea has no statistically significant effects on EP values. In subjects with a large area of the microvessel lesion (large fenestra: approximately 0.2 x 0.8 mm2), a decrease in the EP value (mean +/- SEM 7.9 +/- 0.8 mV) was noted. However, the control group animals with a large fenestra but without microvessel lesion also displayed a decrease (8.6 +/- 0.8 mV) in EP. In the current study we were unable to differentiate whether the EP changes in animals with the large fenestra microvessel lesions were caused by the cochlear blood flow decrease or by the surgical preparation. However, the results of this study indicated if the EP value was affected by the large area of the microvessel lesion, the level of decrease would not be large. That is, the EP decrease was less than the EP change in the control group (mean: 8.6 mV). Considering the dependence of EP on blood flow, the data of this study suggest that compensatory mechanisms in the cochlea may maintain the EP following a focal lesion in the lateral wall of the cochlea. This study also indicates that the photochemical method provides a reliable approach to produce the animal model with the focal microvessel lesion in the lateral wall of the cochlea.     

Prostaglandin E receptor subtypes in cultured rat microglia and their role in reducing lipopolysaccharide-induced interleukin-1beta production

Prostaglandins (PGs) are potent modulators of brain function under normal and pathological conditions. The diverse effects of PGs are due to the various actions of specific receptor subtypes for these prostanoids. Recent work has shown that PGE2, while generally considered a proinflammatory molecule, reduces microglial activation and thus has an antiinflammatory effect on these cells. To gain further insight to the mechanisms by which PGE2 influences the activation of microglia, we investigated PGE receptor subtype, i.e., EP1, EP2, EP3, and EP4, expression and function in cultured rat microglia. RT-PCR showed the presence of the EP1 and EP2 but not EP3 and EP4 receptor subtypes. Sequencing confirmed their identity with previously published receptor subtypes. PGE2 and the EP1 agonist 17-phenyl trinor PGE2 but not the EP3 agonist sulprostone elicited reversible intracellular [Ca2+] increases in microglia as measured by fura-2. PGE2 and the EP2/EP4-specific agonists 11-deoxy-PGE1 and 19-hydroxy-PGE2 but not the EP4-selective agonist 1-hydroxy-PGE1 induced dose-dependent production of cyclic AMP (cAMP). Interleukin (IL)-1beta production, a marker of activated microglia, was also measured following lipopolysaccharide exposure in the presence or absence of the receptor subtype agonists. PGE2 and the EP2 agonists reduced IL-1beta production. IL-1beta production was unchanged by EP1, EP3, and EP4 agonists. The adenylyl cyclase activator forskolin and the cAMP analogue dibutyryl cAMP also reduced IL-1beta production. Thus, the inhibitory effects of PGE2 on microglia are mediated by the EP2 receptor subtype, and the signaling mechanism of this effect is likely via cAMP. These results show that the effects of PGE2 on microglia are receptor subtype-specific. Furthermore, they suggest that specific and selective manipulation of the effects of PGs on microglia and, as a result, brain function may be possible.     

Effects of K(+)-channel blockers on cochlear potentials in the guinea pig

The effects of different K+ channel blockers, 4-aminopyridine (4-AP), tetraethylammonium (TEA) and quinine, on the various cochlear potentials were observed by the means of perilymph infusion. Each of the three blockers depressed the compound action potential. However, they exerted quite different effects on other cochlear potentials, especially comparing 4-AP, a fast K(+)-channel blocker, with two other blockers. 4-AP induced a significant increase in the magnitude of summating potential, while TEA and quinine decreased it; 4-AP showed no effect on the general endocochlear potential (G-EP, the EP value recorded directly from the scala media, SM) and the negative EP component (N-EP), while TEA and Quinine increased G-EP and decreased the absolute value of N-EP. They also exerted different effects on the EP changes induced by exposure to intense noise. The results indicate the different roles of different K(+)-channels in the generation of cochlear potentials. The relationship of the two components of EP (positive and negative) and the G-EP was discussed.     

Development of a simple approach to modify the supporting properties of seating foam for pressure relief

BACKGROUND: The combined effect of electric pulses (EP) and antiproliferative agents on the proliferation of rabbit Tenon's capsule fibroblasts was investigated. METHODS: Rabbit Tenon's capsule fibroblasts were cultured. Some of these cells were exposed to various intensities of EP alone (500-2500 V/cm). Other cells were then exposed for 30 min to an antiproliferative agent: bleomycin (BLM; 0.0005-50 mumol/l), mitomycin C (MMC; 0.0005-50 mumol/l), 5-fluorouracil (5-FU; 0.05-5000 mumol/l), or streptomycin (SM; 0.0005-50 mumol/l) with or without EP (2000 V/cm, 99 mus, eight pulses). Cell proliferation was assessed by cell counting on day 3 and by a 3H-thymidine uptake assay. DNA fragmentation was assessed by flow-cytometric analysis and agarose gel electrophoresis. RESULTS: A significant reduction in the cell number was observed only at 2500 V/cm (P < 0.05). BLM, MMC and 5-FU treatment inhibited cell proliferation in a dose-dependent manner either with or without EP (ID50: BLM alone, 0.029 mumol/l; BLM and EP, 0.00022 mumol/l; MMC alone, 41.6 mumol/l; MMC and EP, 27.5 mumol/l; 5-FU alone, 1045 mumol/l; 5-FU and EP, 690.2 mumol/l; P < 0.05). EP treatment induced an inhibitory effect of BLM on cell proliferation which was 100 times more prominent than BLM alone (0.0005 mumol/l of BLM alone 103.4 +/- 4.4%, 0.0005 mumol/l of BLM and EP 26.0 +/- 4.4%; P = 0.021). BLM treatment with EP also augmented the apoptotic-like DNA fragmentation in both a flow-cytometric DNA histogram and agarose gel-electrophoresis. CONCLUSION: EP treatment enhanced the inhibitory effect of BLM on the cell proliferation of Tenon's capsule fibroblasts of rabbits. The combination of electric pulses and antiproliferative drug treatments may therefore reduce the necessary dose of antiproliferative agents in filtering surgery.