基于网络优化技术的转炉系统大修计划

转炉大修是一项非常复杂和重要的工程,该项目含任务多、工序多、工序之间的配合和衔接关系复杂.整个大修项目涉及到企业内部多个部门和企业外部的多个单位,组织协调难度非常大,建立高效的大修项目管理组织,并对项目进度进行科学的计划,无论是在经济上还是技术上,都具有极为重要的意义.运用工期优化、时间和资源优化、时间和费用优化的网络优化技术,经过反复的优化处理,建立了韶钢转炉大修的网络进度计划,比预期的计划提前5天完工,为企业创造了良好的经济效益.     

高炉整体推移技术在新钢7号高炉大修中的应用

新钢公司7号高炉在复杂的作业环境条件下从600m^3扩容改造为1200m^3,并成功地应用了高炉整体推移技术,工期比正常情况下的缩短50天,企业增效6 000多万元.为相同条件下的高炉大修找到了一条解决生产与大修工期相矛盾的新途径、新工艺.     

抢修4号高炉放残铁技术总结

４号高炉第二代炉龄抢修放残铁技术复杂，难度大。采取的技术措施有力，效果显著。为缩短高炉大修工期创造了条件，并为高炉停炉放残铁积累了经验。     

全国冶金自动化信息网专栏

变频调速技术及其在高炉卷扬机上的应用马钢一铁厂9号高炉上料卷扬拖动系统采用交流电机转子加电阻调速。受电控设备配套的限制,设备故障率高,维修量大。本次大修将上料主卷扬电机改为200kW的变频电机,通过变频装置进行调速,并与PLC进行通信,从而使电机软启动,避免了料车掉道、     

酒钢已成熟掌握冶金转子磁粉检测技术

在酒钢钢研院采访时获悉,经过技术专家的多年努力,酒钢已较为成熟地将磁粉检测技术运用于冶金大型转子的检测之中,推动了企业的检测技术向更高层次发展。受行业特点影响,冶金转子多为“身高”和“体重”都出众的“大家伙”。同时,转子属于精密高技术备件,价格十分昂贵,因此检测的难度和风险可见一斑。一直以来,酒钢在检测转子时采用的是冶金行业普遍使用的渗透检测。渗透检测与磁粉检测是冶金行业并行发展的两种检测法,前者最适合于表面形状复杂的金属部件的检测,     

宝钢大型高炉快速大修技术的发展与应用

对宝钢大型高炉快速大修技术的发展进行了总结.自2号高炉大修开始,研究和应用快速大修技术,核心是"系统功能模块组合法",即采用大型模块化的施工方法,实现炉顶的整体拆装和炉体的分段拆装.2号高炉大修工期缩短至98天,1号高炉大修工期缩短至78天.     

网络计划技术在仪控大修中的应用

针对热风炉仪控大修过程中存在的工期短、施工量大、施工现场复杂、系统调试复杂等问题，莱钢应用网络计划技术对施工过程进行严格的管理和控制，通过优化网络图，根据网络图组织施工，在保质保量保安全的前提下缩短了工期，提高了工效。     

超声波测厚技术在贮缸设备大修中的应用

以往我厂的大修型式都是采用定期预防型式,这种大修型式往往易造成设备不足大修和过剩大修。自从我们开展设备状态监测和故障诊断技术以来,对我厂部分设备的大修型式作了一点改进,根据设备的实际状况和承载能力来进行大修决策。     

电解铝工业危废处置技术现状与发展趋势

详细介绍了国内外电解铝大修渣处置技术的发展现状,分析和研究我国电解铝大修渣的处置技术面临的瓶颈和问题,围绕政策、传统技术以及国外技术在国内推广情况进行剖析,指出了我国电解铝危废大修渣废槽衬和废阴极的处置技术发展方向。     

铝电解大修渣处置技术探讨

大修渣是铝电解槽大修时产生的固体废物,对环境危害极大,已于2016年列入《国家危险废物名录》,本文主要介绍了国内外铝电解大修渣处置的部分典型技术和方法。     

Ossification of the coracoacromial ligament: association with rotator cuff pathology of the shoulder

The objective of this study was to assess the association of ossification of the coracoacromial ligament (CAL) observed on conventional radiographs with the presence of rotator cuff pathology as demonstrated by magnetic resonance imaging (MRI), arthrography, and/or surgery. Conventional radiographs (internal and external rotation and outlet and axillary views) on eight patients showed ossification of the coracoacromial ligament. Rotator cuff integrity was assessed by physical examination in all 8 patients, by arthrography in 3 patients, and by MRI in 2 patients. Surgery was performed on four of the patients. Physical examination showed impingement findings and decreased rotator cuff strength suggestive of rotator cuff disease in all eight patients. The arthrograms and MRI examinations showed the presence of full-thickness rotator cuff tears. Four of these patients underwent surgery and the rotator cuff defects were confirmed and repaired. Identification of ossification of the CAL on conventional radiographs should be recognized as strongly suggestive of associated significant rotator cuff pathology.     

Amplification of the clinical spectrum of Robinow syndrome

Calcifying tendinitis is a relatively common disorder of the rotator cuff. For symptomatic patients, excision of the calcium deposits offers reliable pain relief. The arthroscopic technique is demanding. Arthroscopic localization of the deposit is frequently demanding. The technique described in this article facilitates the localization of calcium deposits based on preoperative ultrasonography. Knowing the exact topography of the deposit relative to the visible landmarks allows the surgeon to localize the site of the deposit from the intra-articular view. Probing the rotator cuff with a spinal needle and looking for calcific material at the tip of the needle is an important step in verifying the location of the deposit.     

烧结主抽风机挂泥现象原因分析及改进措施

结合长钢烧结厂生产实际情况，对烧结主抽风机转子挂泥现象进行了原因分析，并提出了改进措施。     

Geometric and mechanical properties of the coracoacromial ligament and their relationship to rotator cuff disease

One of the most common causes of pain and disability in the upper limb is inflammation of the rotator cuff tendons. When no significant bony abnormality exists in the surrounding structures, the coracoacromial ligament has been implicated as a possible cause of impingement on the cuff tendons. Geometric and mechanical properties of 20 coracoacromial ligaments, 10 from shoulders with rotator cuff tears and 10 from normal shoulders, were accurately determined. In comparing rotator cuff tear and normal specimens, statistically significant changes in geometric properties were measured in the lateral band, but not in the medial band, of the ligament. The lateral band, which is the region most likely to impinge on the rotator cuff, was shorter and had a larger cross-sectional area in specimens with rotator cuff tears. Although there were no statistical differences in structural properties of the ligament between normal and rotator cuff tear groups, significant changes were evident in material properties. Previously reported histologic differences in the ligament in shoulders with rotator cuff tears are supported by the decreased material properties measured in the current study. Whether the differences in the coracoacromial ligament cause impingement or are due to impingement is still unknown at this time.     

Effects of acute administration of transdermal estrogen on postmenopausal women with systemic hypertension

Os acromiale, failure of fusion of the secondary centers of ossification of the acromion process, has been noted as a contributing factor in shoulder impingement syndrome and rotator cuff tears. Treatments for symptomatic os acromiale with or without rotator cuff tears have been reported in the literature and range from excision of small fragments to fusion of larger, fragments with internal fixation and bone grafting. Generally, rotator cuff repairs have been performed when possible. We report an acromion splitting approach through an existing os acromiale to gain exposure for the repair of a massive rotator cuff tear. Subsequent to this repair, the acromion was repaired with internal fixation. Good functional use of the patient's upper extremity was obtained and the patient expressed satisfaction with the surgical outcome. The acromion splitting approach is a viable approach in patients with an os acromiale and a coexistent rotator cuff tear.     

Prolonged survival in patients with advanced melanoma treated with neoadjuvant chemotherapy followed by resection

We conducted this cadaveric study to define a biomechanical rationale for rotator cuff function in several deficiency states. A dynamic shoulder testing apparatus was used to examine change in middle deltoid muscle force and humeral translation associated with simulated rotator cuff tendon paralyses and various sizes of rotator cuff tears. Supraspinatus paralysis resulted in a significant increase (101%) in the middle deltoid force required to initiate abduction. This increase diminished to only 12% for full glenohumeral abduction. The glenohumeral joint maintained ball-and-socket kinematics during glenohumeral abduction in the scapular plane with an intact rotator cuff. No significant alterations in humeral translation occurred with a simulated supraspinatus paralysis, nor with 1-, 3-, and 5-cm rotator cuff tears, provided the infraspinatus tendon was functional. Global tears resulted in an inability to elevate beyond 25 degrees of glenohumeral abduction despite a threefold increase in middle deltoid force. These results validated the importance of the supraspinatus tendon during the initiation of abduction. Glenohumeral joint motion was not affected when the "transverse force couple" (subscapularis, infraspinatus, and teres minor tendons) remained intact. Significant changes in glenohumeral joint motion occurred only if paralysis or anatomic deficiency violated this force couple. Finally, this model confirmed that rotator cuff disease treatment must address function in addition to anatomy.     

A review of patients with high-risk carcinoma of the cervix treated with combined surgery and postoperative radiotherapy

The subacromial bursa is recognized as a site associated with the shoulder pain caused by rotator cuff disease in the middle-aged and elderly. Substance P is contained in primary afferent nerves, and its quantity increases during chronic pain. The amount of substance P in the subacromial bursa of patients with rotator cuff disease was examined. Radioimmunoassay and immunohistochemistry were employed to quantify and localize substance P. The preoperative pain level was measured with a visual analogue scale with 0 as no pain, 5 as moderate, and 10 as severe. Thirty-seven patients that had undergone operation were divided into two groups: one composed of 19 patients with subacromial bursitis and a partial-thickness tear of the rotator cuff (nonperforated cuff) and the other composed of 18 patients with a full-thickness tear (perforated cuff). Subacromial bursae obtained from seven fresh cadavers with no shoulder pain before death were used as controls. The visual analogue scale showed significantly greater pain in the group with the nonperforated rotator cuff than in the group with the perforated cuff. Consistent with these results, the amount of substance P in the subacromial bursa was significantly greater in the former group than in the latter. Nerve fibers immunoreactive to substance P were localized around the vessels, with a larger number of fibers in the group with the nonperforated rotator cuff. Therefore, an increased amount of substance P in the subacromial bursa appears to correlate with the pain caused by rotator cuff disease.     

Arthroscopic assessment of rotator cuff tear reparability

To evaluate the efficacy of arthroscopic techniques in determining the potential reparability of complete rotator cuff tears, a clinical investigation was performed. The parameters of tear size measurement, tendon quality, tendon mobility, and suture anchor placement were evaluated. These parameters were determined using both arthroscopic and open surgical technique. No statistically significant differences were noted when the arthroscopic findings were compared with the findings at open rotator cuff repair. Arthroscopic techniques can reliably assess rotator cuff tear size, tendon quality, tendon mobility, and suture anchor placement.     

Using monoclonal antibodies to characterize a sequential epitope on the group I allergen of Bermuda grass pollen

We measured the incidence of cuff retear and injury to the suprascapular nerve after mobilization and repair of a massive rotator cuff tear. Of one hundred four rotator cuff repairs performed over a 5-year period, 10 patients (7 men and 3 women, age range 22 to 68 years) had primary repairs of massive rotator cuff tears requiring cuff mobilization and an acromioplasty as their only procedure. These patients were evaluated at a mean of 2.5 years (range 2.0 to 3.0 years) after surgery. At follow-up electromyographic examination confirmed that 1 of the 10 patients had an iatrogenic suprascapular nerve injury, whereas ultrasound evaluation revealed that 2 of 10 repairs failed. Pain relief was achieved in the eight patients with intact repairs and not in the two with recurrent tears. All patients had some limitation of active motion or strength, especially in external rotation. Thus 7 of 10 patients had neither evidence of nerve injury nor recurrent rotator cuff tears yet still showed limited active motion or weakness. It appears that operative injury to the suprascapular nerve during cuff mobilization can occur, but other factors such as inadequate cuff muscle function are more frequently responsible for the poor functional outcomes seen after successful repairs of massive rotator cuff tears.     

Sonography for the office screening of suspected rotator cuff tears: early experience of the orthopedic surgeon

This study examined the feasibility of orthopedic surgeons performing sonography of the shoulder at the initial office evaluation of the rotator cuff and assessed the sensitivity, specificity, and predictive value of sonography for the detection of tears in the rotator cuff. Initial results in 24 patients suggest that sonography by the orthopedic surgeon is feasible and that it detects tears in the rotator cuff with sufficient accuracy for clinical decision making.