球团竖炉结构和操作参数设计原则

 围绕球团竖炉结构和操作参数与竖炉产量之间的关系，分析了焙烧带宽度和火口中心线上料层高度与竖炉产量之间的关系，提出了竖炉结构和操作参数的设计原则。研究表明，竖炉产量并非随焙烧带宽度和火口中心线上料层高度的增加而一味增加，焙烧带宽度和火口中心线上料层高度均存在最佳值；根据竖炉的焙烧工艺和经验数据初步确定竖炉的结构和操作参数，然后根据炉内气体流动是否合理来调节结构和操作参数，最后根据炉内球团运动是否顺畅来进一步调节结构和操作参数。     

球团竖炉热工操作参数确定

研究了竖炉的操作参数与竖炉利用系数之间的关系,提出了影响竖炉热工操作参数的三个层面,阐述了竖炉在某个利用系数下,适宜操作参数的确定,对指导竖炉的生产和设计有重大意义。     

近年来马钢一烧球团生产的技术进步及效果

马钢一烧竖炉球团系统投产后，通过设备改造和技术创新，包括优化配料方案、增设润磨工艺、探索热工参数，设计新型烘干炉、改造竖炉炉型等，并对生产设备采用计算机系统控制及数据信息自动采集处理，竖炉作业率、利用系数，球团矿产量、合格率，膨润土单耗等多项指标达全国先进水平。     

新型钒制品焙烧竖炉操作参数的确定

研究以钒钛磁铁矿为主要原料的焙烧竖炉的操作参数与利用系数之间的关系,提出了影响焙烧竖炉热工操作参数的3个层面,并阐述了3个层面之间的相互联系,同时对新型焙烧竖炉在某一利用系数下合适操作参数的确定进行了表述,对指导钒制品焙烧竖炉的生产运行有重要意义.     

汽化冷却在8 m2球团竖炉中的应用

介绍了安庆铜矿8m^2竖炉球团工程中竖炉主要设计参数、工艺流程，重点介绍了汽化冷却循环系统的主要工艺技术特点和运行效果。     

导风墙-干燥床式球团竖炉利用系数研究

建立了导风墙-干燥床式球团竖炉的丁燥、预热焙烧、均热以及冷却过程数学模型，得出了球团竖炉本体高度的计算式。由于竖炉球团工艺是球团的干燥、预热焙烧、均热以及冷却过程的集成，焙烧能力要求必须有与之间步的干燥能力，研究得到了球团坚炉利用系数与其结构和操作参数之间的关系，可为球团竖炉设计与操作提供参考。     

酒钢选矿厂竖炉自动控制系统

本文介绍了酒钢选矿厂竖炉自动控制系统的硬件结构、软件结构，竖炉焙烧设备工艺，工艺参数控制以及在生产实践中的作用。竖炉自动控制系统的应用为多回收铁矿资源发挥了重要作用，为企业带来良好的经济效益。     

竖式移动床内气固传热实验研究

为了确定球团竖炉生产能力(利用系数)与结构和操作参数之间的定量关系，以球团竖炉利用系数为目标，用热成像仪分析竖式移动床内气固传热规律，研究了料层中火焰穿透深度、焙烧加热高度和结构与操作参数之间的关系。     

炼铁厂竖炉炉型结构的创新改造

介绍了为增加竖炉球团矿产量,并保证球团矿质量的情况下,在原来杭钢成熟竖炉炉型的基础上,加大导风墙出风口面积,从而增加竖炉烘干床生球的干燥量,提高球团矿产量.导风墙出风口面积改变后,显著改变了炉内冷却风和热废气的分配,因此必须对竖炉的冷却系统、小水梁等设备进行适应性改造,对竖炉操作、各项热工参数进行适应性摸索.     

影响球团竖炉利用系数的因素分析

在竖炉炉型结构一定的条件下，对影响竖炉生产指标（球团竖炉的利用系数）的因素进行分析，找出球团竖炉的利用系数及操作参数（风压、风量、炉内压力、炉内温度、炉内氧气含量等）以及球团质量、单位能耗之间的变化规律，为球闭竖炉高效化生产技术攻关打下坚实的基础。     

球团配加膨润土实验室及工业试验研究

在实验室测定了1号、2号膨润土与现场用膨润土的理化性能,通过造球对比实验,确定了1号、2号膨润土的适宜配比,分析了其对球团铁品位及低温还原粉化性能的影响.在此基础上进行了带式焙烧机半工业性投笼试验及工业试验.试验表明,1号膨润土适宜配比不小于1.9%,2号膨润土适宜配比大于1.1%;配加1号膨润土时球团铁品位比基准期降低了0.38个百分点,配加2号膨润土的铁品位比基准期提高了0.18个百分点;基准期成品球团低温还原粉化性能比试验期好.     

A fatal low-molecular-weight heparin-associated thrombocytopenia after hip surgery: possible usefulness of PF4-heparin ELISA test

In 37 patients undergoing total hip replacement, a prophylactic treatment by a low-molecular-weight heparin (LMWH) was conducted for 2 weeks. They belonged to a group of 499 patients included in a multicenter clinically controlled trial comparing two LMWHs. Blood was collected 1 day before surgery (D-1) and at D+1 or D+2 and D+5 or D+6 as well as D+10 through D+14 after surgery for determinations of platelets counts and anti-Xa. Bilateral venography was performed between D+10 and D+14. A fatal heparin-associated-thrombocytopenia (HAT) occurred on D+9 in one patient and was associated with a positive platelet aggregation test. This finding was confirmed with a recent ELISA test which evidenced a high concentration of PF4-heparin dependent antibodies 72 h before the detection of thrombocytopenia. This led us to study retrospectively PF4-heparin ELISA results by testing the plasma samples of 36 other surgical patients treated under the same conditions and during the same period (four measurements per patient). Among these patients, seven had a venous thrombotic event as a treatment failure. Although some authors claimed that some post-operative thromboses may be facilitated by the presence of heparin-dependent antibodies associated with or without thrombocytopenia, no thrombocytopenia and no positive PF4-heparin ELISA test was observed in this group. Out of the 144 tests performed in these 36 patients for the detection of PF4-heparin complexes dependent antibodies, 15 results were borderline in ten patients and three results in two patients were positive. No relation was evidenced between a positive ELISA test and the occurrence of venous thrombosis. This study points out the possible usefulness of the PF4-heparin ELISA test for HAT-antibodies detection. A daily platelet count in a postoperative patient under heparin therapy, showing thrombocytopenia associated with the detection of heparin-dependent antibodies could allow an earlier and more reliable diagnosis of HAT.     

进口巴西矿的球团试验研究

以巴西镜铁矿为研究对象,进行了生球制备试验和预热焙烧小型试验。试验结果确定了生球制备试验的最佳参数和球团预热焙烧试验适宜的预热焙烧制度。生球制备试验的最佳参数:膨润土用量为2.1%,造球水分为8.5%(质量分数),造球时间为13 min,此时落下强度为5.0次/(0.5 m),生球抗压强度为11.26 N/个,爆裂温度为356℃,符合球团生产对生球质量的要求。球团预热焙烧试验适宜的预热焙烧制度:预热温度为900℃,预热时间为10 min,焙烧温度为1 200℃,焙烧时间为15 min,此时预热球强度能达到500 N/个以上,焙烧球强度能达到2 500 N/个以上,符合高炉对球团矿的质量要求。     

High incidence of anti-heparin/platelet factor 4 antibodies after cardiopulmonary bypass surgery

Fifty-one patients undergoing cardiopulmonary bypass (CPB) were studied on day 0 and day 8 for heparin-induced thrombocytopenia (HIT). The platelet aggregation test (PAT) and tests for anti-heparin-platelet factor 4 (anti-H.PF4), anti-IL8 and anti-neutrophil activating peptide 2 (anti-NAP2) antibodies (Ab) were performed by ELISA. On day 8, 27% of patients were positive for anti-H.PF4Ab. None of these results were found to influence thrombotic complications or platelet counts after CPB. Our results suggest that IgG to H.PF4 may be considered a risk factor, but that additional factors must be required for HIT to develop. We conclude that assays based on platelet activation would be more appropriate for the diagnosis of HIT after CPB.     

Dyspnea proneness to CO2 stimulation and personality (neuroticism, extraversion, MMPI factors)

The relationship between extroversion (E), MMPI factors on the one hand and the ventilatory response to CO2 on the other was examined in order to extend and clarify earlier studies. 30 male nonsmokers were studied using the method of Read (delta VE/PaCO2 as index of readiness to react with dyspnea upon CO2 stimulation). Extroversion (E) and neuroticism (N) was assessed by the Eysenck Personality Test. The panic-fear (PF) and the ego-strength (Es) scales were extracted from the MMPI. The correlation between E, N, MMPI values and delta VE/PaCO2 was measured with Pearson's correlation. Reliability between the first and second respiratory test was obvious, r = 0.66 (p less than 0.001). The correlation between the psychological parameters and the readiness to respond to CO2 was very low in the first test. In the second test, the r for hypochondriasis, depression and PF was 0.25, 0.28 and 0.29, respectively (p less than 0.1; 2-tailed), for N the r was 0.33, for psychastheny 0.33, and for Es -0.40 (all p less than 0.05). In agreement with Saunders and co-workers, we found no correlation for E. Our results indicate that readiness to react to CO2 is related to anxiety (positive correlations for N, Hs, Pt and PF, and negative for Es). This corresponds to clinical observations.     

宣钢炼铁厂球团矿配加有机黏结剂生产实践

介绍了宣钢炼铁厂在链篦机-回转窑球团矿生产过程中配加有机黏结剂的试验过程，并总结了不同配加量对球团工艺操作及产质量指标的影响，且达到最佳配量时能够提高球团矿品位，降低SiO2含量。     

The peripheral flicker effect: desensitization of the luminance pathway by static and modulated light

Previous studies have shown that luminance flicker, presented peripheral to a foveal test target, increases thresholds for target detection: the peripheral flicker (PF) effect. These studies have also shown that thresholds are elevated more for luminance targets, relative to chromatic targets. In the present study we examined the specificity of the PF effect on the luminance mechanism and assessed the contribution of modulated stray-light to the test field, as well as longer range spatial interactions. We found that the presence of a foveal luminance pedestal, as well as PF, caused a notch to appear in the spectral sensitivity function around 570 nm. This result confirms the hypothesis that the PF effect decreases the sensitivity of the luminance pathway. To assess the contribution of stray-light to the PF effect, we modulated a luminance pedestal without the presence of PF in order to simulate the stray-light effect in isolation. A decrease in sensitivity for wavelengths around 570 nm occurred with modulated stray-light, suggesting that modulated stray-light contributes substantially to this effect. We then minimized the modulated stray-light by phase-reversing a checkerboard pattern in the periphery. A significant, though smaller, threshold elevation to mid-spectrum stimuli was obtained, suggesting that long range spatial effects are also active in the PF effect. We conclude that the PF effect causes a desensitization of foveal luminance pathways via local and more long range spatial interactions. Our results are consistent with previous data which suggest that the PF effect is due to selective adaptation of cells in the magnocellular pathway (M-cells). Our data imply that local network adaptation may be a property of the magnocellular pathway.     

Responses to norepinephrine of normal and "ischemic" canine Purkinje fibers are consistent with activation of different alpha 1-receptor subtypes

INTRODUCTION: Previously we found that WB4101 (WB) 10(-7) M competitively blocks three alpha 1-adrenergic receptor-effector responses: the increase in normal automaticity occurring in Purkinje fibers (PF) at high membrane potentials; the increase in abnormal automaticity occurring in PF at depolarized membrane potentials; and the prolongation of PF action potential duration. These observations are consistent with two different hypotheses: (1) WB blocks a single alpha 1-receptor subtype, which subserves different effector pathways; and (2) WB blocks different receptor subtypes, each of which subserves an independent pathway. The aim of this study was to test both hypotheses. METHODS AND RESULTS: We used standard microelectrode techniques to study the concentration-dependent actions of three alpha 1-adrenoreceptor blockers (WB [alpha 1A > or = alpha 1D], 5-methylurapidil [5-MU] [alpha 1A > > alpha 1D], and UK52,046 [nonselective]) or norepinephrine (NE) effects in normal PF and in PF depolarized with a simulated ischemic solution ([K+]o = 10 mM; pO2 < 20 mmHg; pH 6.8; maximum diastolic potential -60 +/- 1 mV). In normally polarized PF, concentration-dependent actions of all blockers on both the positive chronotropic response and the prolongation of action potential duration completely coincide. In contrast, the response to NE of abnormal automaticity in "ischemic" PF differs from normals: there is a high sensitivity to WB and 5-MU and no response to UK52,046. CONCLUSIONS: (1) A single receptor subtype appears responsible for both the alpha 1-induced prolongation of repolarization and the positive chronotropic effect in normal PF. (2) Two different receptor subtypes may be responsible for the alpha 1-induced effects on automaticity in normal and ischemic fibers. It is likely that the latter one is alpha 1A, and that consideration of antiarrhythmic therapy with alpha 1-adrenergic blockers should focus on this subtype as a potential target.     

The relationship between microstructure and stress-strain behavior in tension in high strength pipeline steel

In this paper the relationship between microstructure and stress-strain behavior in tensile test of high strength pipeline steel was investigated.The steel with polygonal ferrite-bainite(PF + B) microstructure has a "round-house" type tensile stress-strain curve with low Y/T ratio,highly uniform elongation and high n-value,which means PF + B microstructure has the best deformability(i.e.Ideal stress-strain behavior) among the four microstructures.The steel with acicular ferrite-martensite&austenite(AF + MA) microstructure has a "continuous-yielding" type tensile stress-strain curve,whose deformability is worse than that of PF + B microstructure.Both the steels of polygonal ferrite-acicular ferrite(PF + AF) and polygonal ferrite-pearlite (PF+P) microstructure have "luders elongation" type tensile stress-strain curve with high Y/T ratio,low uniform elongation and low n-value,which means PF + AF and PF + P microstructures have the worst deformability among the four microstructures.     

The effect of Pseudomonas aeruginosa on the immunogenicity of enterobacterial common antigen

Pseudomonas aeruginosa produces a factor (PF) which alters the enterobacterial common antigen (ECA). Its effect on the immunogenicity of two types of immunogenic ECA, namely, the ethanol-soluble preparation freed of lipopolysaccharide and the LPS-coupled form from the R-mutant E. coli 014 was investigated. The antibody response following intravenous immunization was determined by means of the hemagglutination test. It is shown that PF abolishes the immunogenicity of the former but not of the latter. PF obtained from a strain of P. maltophilia yielded the same results. Antiserum against Pseudomonas aeruginosa of types 1 and 6 neutralizes PF produced by either type. These results suggest that PF alters the lipid part and not the haptenic determinant of ECA and that this activity is neutralized by P. aeruginosa antiserum of either type 1 or type 6. This interpretation is compatible with the identification of PF as a lipase.