武钢第二炼钢厂连铸机改造方案及其工艺分析

介绍了武钢第二炼钢厂连铸机改造方案 ,并分析了现有连铸机的工艺缺陷以及本次改造拟将采用的技术措施 ,比较了直弧形连铸机与全弧形连铸机以及多点弯矫与连续弯矫方式的不同特点 ,同时 ,对武钢二炼钢厂连铸机系统下一步改造工作提出了建议。     

阳极精炼及浇铸的作业方式与金隆扩产方案的选择

结合世界上主要铜冶炼厂回转式阳极炉和圆盘浇铸的作业方式,分析了不同作业方式在金隆扩产改造中应用的可行性。根据金隆扩产的产量规模、目前的作业水平、将来操作改善的可能,对各种改造方案进行了论证,提出了优化的改造方案。根据阳极精炼和圆盘浇铸作业技术发展趋势的分析,提出了未来金隆阳极精炼和圆盘浇铸的优化作业方式,并指出了达到优化作业目标需要解决的主要问题。     

桃冲矿选矿工艺设备优化与改造生产实践

桃冲矿选矿厂针对矿石性质的变化,对选矿工艺及设备进行了改造与优化组合,在此基础上提出下一步改造方案,准备在未来逐步实施,对选矿厂提高产能具有重要意义。     

350步进底式加热炉机械传动系统的改造

本文介绍了北钢350步进底式加热炉机械系统改造的实施过程，对原步进式加热炉机械传动系统存在问题进行了理论分析，介绍了技术方案及其结构特点。     

拆衬机走行机构的研究和改造

通过对走行机构方案的比较，分析了走行机构的分类，结构及驱动方式，并结合实例进行了机械设计和改造     

广钢双膛石灰窑技术改造分析

本文分析了广钢双膛石灰窑改造工程及生产技术攻关的主要技术改造情况和经验，探讨冶金石灰窑设备配套的技术特点和技术要领等，提出下一步提高炉窑技术水平的方案。     

竖炉膨润土细粉料罐车气力输送

介绍了膨润土罐车气力输送改造前的状况,并详细研究了技改方案及相关的设备配置及费用预算,最后对技改效益进行分析,效果良好。使用气体输送方式相对于人工装卸方式成本降低,每年吨球团矿减少成本为0.031元/t。     

氮气管网系统节能优化改造

对氮气系统管网进行了优化改造,实现了不同质量的空分氮气产品并网运行,供应不同用户。分析了改造方案的可行性,实现了氮气产品综合利用,取得了明显的节能效果。     

某厂合金钢棒材改造工艺方案设计思路

本文主要论述了某厂合金钢棒材改造的工艺方案设计思路即生产规模及产品方案的确定、产品质量精度的定位及保证措施、坯料的选择及轧线布置形式的选择，并对工艺平面布置设计过程中所出现的不同方案进行了分析、确定。     

同步电机可控硅励磁装置技术改造

对电机故障进行技术分析,认为导致电机和励磁装置损坏的原因是可控硅励磁装置不完善、失步保护装置不可靠、控制部分技术性能差等。为此,对可控硅的励磁装置主电路、投励方式、触发脉冲输出、失步保护等进行改造,保证了电机的可靠运行,满足了生产要求。     

Perception of auditory–visual temporal synchrony in human infants.

Using a habituation/test procedure, the author investigated adults' and infants' perception of auditory–visual temporal synchrony. Participants were familiarized with a bouncing green disk and a sound that occurred each time the disk bounced. Then, they were given a series of asynchrony test trials where the sound occurred either before or after the disk bounced. The magnitude of the auditory visual temporal asynchrony threshold differed markedly in adults and infants. The threshold for the detection of asynchrony created by a sound preceding a visible event was 65 ms in adults and 350 ms in infants and for the detection of asynchrony created by a sound following a visible event was 112 ms in adults and 450 ms in infants. Also, infants did not respond to asynchronies that exceeded intervals that yielded reliable discrimination. Infants' perception of auditory–visual temporal unity is guided by a synchrony and an asynchrony window, both of which become narrower in development. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

Cerebral dominance and asynchrony between bimanual two-dimensional movements.

The asynchrony of bimanual movements was investigated. Right- and left-handers traced simple geometrical patterns (ellipses) continuously with both hands. All combinations of the direction of rotation in each hand were executed at different rhythms. Geometrically, performances were largely independent of manual dominance. However, by comparing the passage times at homologous positions, the authors found that the dominant hand led the nondominant one by about 25 msec. The asynchrony was affected by neither movement type nor rhythm. The variability of the asynchrony varied along the trajectory, with well-defined maxima and minima. The variability profiles for movements that engaged homologous muscles differed markedly from those that engaged nonhomologous muscles. The authors discuss the hypotheses that bimanual periodic movements are timed by a lateralized functional module and that asynchrony is due to the necessity of transmitting time-keeping information to the other hemisphere. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The nucleolar functional asynchrony--imbalance--in the granulopoietic proliferating compartment of patients suffering from chronic myeloid leukemia

Nucleoli were studied in all stages of the granulopoietic proliferating compartment in the bone marrow of patients suffering from chronic myeloid leukemia to provide an information on the incidence of the nucleolar functional asynchrony (imbalance) in these cells. The nucleolar functional asynchrony is morphologically expressed by the presence of "active" large nucleoli with a relatively uniform distribution of ribonucleic acid (RNA) and "resting" ring shaped nucleoli with RNA only in their peripheral part in one and the same cell. This phenomenon was noted in a small but constant percentage of myeloblasts and decreased in myelocytes regardless of the phase of the disease and therapy. In addition, the nucleolar functional asynchrony was also noted in all stages of the granulopoietic proliferating compartment of control not-leukemic persons.     

Evaluation of left ventricular asynchrony by radionuclide angiography: comparison of phase and sector analysis

The aim of this study was to assess the optimal method to evaluate asynchrony in equilibrium radionuclide angiography (RNA). METHODS: We studied 20 patients (14 males and 6 females, age range 25-60 yr) with RNA during atrial and sequential atrioventricular (AV) pacing, which increased left ventricular (LV) asynchrony. Both studies were performed at the same heart rate. Asynchrony was assessed either on phase images, by computing the standard deviation of the phase distribution (SD-P) and by sector analysis. Systolic and diastolic asynchrony were evaluated as the coefficient of variation of time to end systole (CV-TES) and time to peak filling rate (CV-TPFR) in four sectors. In addition, phase values were computed on time-activity curves from the same sectors, and their standard deviation (SD-Psec) was computed. RESULTS: During atrial pacing SD-P was 32.3 degrees +/- 6.7 degrees and did not change during AV pacing (32.1 degrees +/- 5.6 degrees, p = n.s.). Both CV-TES and CV-TPFR had a significant increase during AV pacing (from 7.7% +/- 3.9% to 11.5% +/- 6.4%, p < 0.01, and from 8.4 degrees +/- 5.8 degrees to 12.9 degrees +/- 6.7 degrees, p < 0.001). AV pacing led to a significant increase in SD-Psec (from 6.3 degrees +/- 4.0 degrees to 12.6 degrees +/- 9.7 degrees, p < 0.05). Moreover, reproducibility was assessed in 15 additional age-matched patients. The results of the reproducibility study indicate a better repeatability for CV-TES and CV-TPFR. CONCLUSIONS: The findings of this study suggest that sector analysis with calculation of indices of LV systolic and diastolic asynchrony is better suited for quantitation of LV temporal nonuniformity.     

Infant perception of audio-visual speech synchrony.

Three experiments investigated perception of audio-visual (A-V) speech synchrony in 4- to 10-month-old infants. Experiments 1 and 2 used a convergent-operations approach by habituating infants to an audiovisually synchronous syllable (Experiment 1) and then testing for detection of increasing degrees of A-V asynchrony (366, 500, and 666 ms) or by habituating infants to a detectably asynchronous syllable (666 ms; Experiment 2) and then testing for detection of decreasing degrees of asynchrony (500, 366, and 0 ms). Following habituation to the synchronous syllable, infants detected only the largest A-V asynchrony (0 ms vs. 666 ms), whereas following habituation to the asynchronous syllable, infants detected the largest asynchrony (666 ms vs. 0 ms) as well as a smaller one (666 ms vs. 366 ms). Experiment 3 investigated the underlying mechanism of A-V asynchrony detection and indicated that responsiveness was based on a sensitivity to stimulus-energy onsets rather than the dynamic correlation between acoustic and visible utterance attributes. These findings demonstrated that infant perception of A-V speech synchrony is subject to the effects of short-term experience and that it is driven by a low-level, domain-general mechanism. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Adverse effects and recovery after total intravenous anesthesia in children

INTRODUCTION: The asynchrony of the left ventricle--i.e., its nonuniform contraction and relaxation--is an important factor for left ventricular function. Heart failure is often related to abnormal systolic function, sometimes associated with a diastolic dysfunction. We studied the relationship of left ventricular asynchrony to left ventricular function in patients with nonischemic heart failure. MATERIAL AND METHODS: Radionuclide angiography at rest was performed in 25 patients with nonischemic heart failure and in 26 age and sex matched normal subjects. In addition to ejection fraction and peak filling rate, two indices of left ventricular asynchrony were calculated: the coefficient of variation of regional time to end systole and the coefficient of variation of regional time to peak filling rate. These factors indicate how disperse are the regional values of time to end systole and of time to peak filling rate. In fact, the higher the value, the greater the asynchrony. RESULTS: A significant (r = .46, p < .05) inverse correlation was found between the ejection fraction and the coefficient of variation of regional time to end systole in both the normal subjects and the heart failure patients, while the ejection fraction correlated significantly (r = .46, p < .05) with the coefficient of variation of regional time to peak filling rate only in the patients. Moreover, the peak filling rate was inversely correlated (r = .57, p < .05) with the coefficient of variation of regional time to peak filling rate in the heart failure patients but not in the normal subjects. CONCLUSIONS: These results suggest that left ventricular systolic and diastolic asynchrony may contribute to impair left ventricular systolic and diastolic function in patients with nonischemic heart failure.     

Auditory development in complex tasks of comodulation masking release

Experiments on listeners aged 5 years to adult were conducted to investigate the development of comodulation masking release (CMR) under conditions where auditory grouping could be affected either by the coherence of modulation pattern among noise bonds, or the temporal asynchrony among bands. The conditions examining CMR when two modulation patterns were present (each carried by a different set of noise bands) indicated a similar effect across all age groups. Here, CMR was substantial when the on-signal band (OSB) and six comodulated flanking bands (FBs) were presented, decreased when two bands having a second pattern of modulation were added, and then recovered partially when a further six bands that had the second modulation pattern were added. In conditions where there was a temporal asynchrony between the OSB and the FBs, the children typically showed smaller CMRs than the adults. In the case where the OSB preceded the FBs, adults typically showed CMR near zero when the temporal fringe was 50 ms or more. Children usually showed negative CMRs for such conditions. In the case where the FBs preceded the OSB, all age groups showed substantial CMRs, but the CMRs of adults were significantly larger than those of the children. The present results indicate that the effect of a second, independent modulation pattern on CMR is similar in children and adult listeners, but that CMR appears to be detrimentally affected more in children than in adults when there is a temporal asynchrony between the on-signal and flanking bands.     

Increased detection and yield of adenovirus in caffeine-stabilised KB cell monolayers

In human leukocyte cultures set up with Eagle's MEM and stimulated with Difco's PHA M, DNA synthesis and mitotic indices were analyzed by means of 3(H)-thymidine autoradiography and cell counting from 23 up to 52 h after culture initiation. Considerable amounts of DNA synthesis and mitoses were found in this time span. This resembles the results found with Ham's F-10 medium. However, the DNA synthesis pattern and the distribution of mitotic indices a higher yield of asynchrony in Eagle's MEM as compared with Ham's F-10 cultures. Proportions of first, second, and third mitoses at 72 h culture time were determined with different methods.     

淮钢套筒窑下烧嘴掺烧焦炉煤气改造

分析了煤气热值下降对石灰煅烧造成的影响,提出下燃烧室掺烧焦炉煤气方案,并对该方案进行了可行性分析,根据方案要求设计了一种新型燃气烧嘴,最后对整个方案的经济性进行了分析,保证了该改造方案无论从技术上还是经济上都能够满足要求。     

天铁动力6~#TRT静叶伺服控制系统改造

针对天铁动力6#高炉煤气余压发电机组(6#TRT)静叶伺服控制系统静叶不同步,造成机组连接板断裂事故,分析了其发生原因,通过改造液压系统和自控伺服系统,设定相关参数,消除了由于静叶不同步而引起的设备故障现象,提高了机组运行周期,提升了发电效率,取得了较好的经济效益。