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新型结合剂SioxX-Zero对喷煤管用无水泥浇注料显微结构和性能的影响
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作者 张思思 王庆虎 +5 位作者 彭红 李亚伟 舒小妹 戴长浩 王丹滨 arindam mukherjee 《硅酸盐通报》 CAS 北大核心 2021年第10期3298-3304,3344,共8页
喷煤管是水泥回转窑的关键承力部位,长期承受高温熟料粉尘和气流的剧烈冲刷,需具备优异的高温力学性能。本工作分别以新型SioxX-Zero和传统铝酸钙水泥为结合剂,采用板状刚玉、α-Al_(2)O_(3)微粉和碳化硅等为主要原料,分别在1100℃和140... 喷煤管是水泥回转窑的关键承力部位,长期承受高温熟料粉尘和气流的剧烈冲刷,需具备优异的高温力学性能。本工作分别以新型SioxX-Zero和传统铝酸钙水泥为结合剂,采用板状刚玉、α-Al_(2)O_(3)微粉和碳化硅等为主要原料,分别在1100℃和1400℃热处理3 h,制备了喷煤管用无水泥和低水泥结合Al_(2)O_(3)-SiC质浇注料,并研究了新型SioxX-Zero结合剂对浇注料显微结构、常规物理性能和高温力学性能的影响。结果表明:与传统铝酸钙水泥相比,SioxX-Zero能有效提高浇注料流动值和延缓流动值衰减,改善其施工性能。同时,含SioxX-Zero的Al_(2)O_(3)-SiC质浇注料中原位生成了数量较多、尺寸较大的针状莫来石,大幅改善了材料的常温抗折/耐压强度、高温抗折强度和高温耐磨性能。 展开更多
关键词 耐火材料 结合剂 无水泥浇注料 Al_(2)O_(3)-SiC质浇注料 SioxX-Zero 水泥回转窑 喷煤管
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Comparison between Distractor Application on Both Radial &Ulnar Side and Radial Side Only for Fracture Distal Radius with Ulnar Styloid Fracture
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作者 Ujjal Bhakat arindam mukherjee Ranadeb Bandyopadhyay 《Open Journal of Orthopedics》 2013年第5期227-233,共7页
Background: Fracture of distal radius with involvement of the ulnar styloid process is a common clinical problem. It can be treated conservatively, usually involving wrist immobilization in plaster cast or surgically.... Background: Fracture of distal radius with involvement of the ulnar styloid process is a common clinical problem. It can be treated conservatively, usually involving wrist immobilization in plaster cast or surgically. A key method of surgical fixation is external fixation by distractor. Distractor can be applied either only on the radial side or on both ulnar and radial sides. Materials and Methods: A prospective randomized and comparative study of 1 year duration was conducted on 32 patients admitted in the Department of Orthopaedics of BSMC & H in the age group of 20 to 75 years old with AO types B and C distal radius fracture along with involvement of the ulnar styloid process. The parameters studied were restoration of radial length, restoration of radial angle, intracarpal step-off and palmar tilt which were statistically evaluated and Fisher’s exact test was performed. The two tailed P-value was calculated and both the groups were statistically compared. Results: In our study, 37.5% patients in Group A and 81.25% in Group B had a radial difference Table 1, Chart 1). 43.75% patients in Group A and 87.5% in Group B had radial angle Table 2, Chart 2). 31.25% in Group A and 75% had intra carpal step off Table 3, Chart 3). 62.5% had an abnormal palmar tilt in Group A while only 6.25% had an abnormal palmar tilt in Group B which is extremely statistically significant. On an average, 2 mm of distraction was required in 75% patients of Group A while only 30% patients in Group B required distraction (Table 4, Chart 4). Conclusion: In our study, the radial difference, radial angle, intra carpal step off and palmar tilt returned significantly to normal in the patients treated with distractor on radial side only when compared with distractor application on both radial and ulnar sides for distal radius fracture with ulnar styloid process involvement. Also post-operative distraction required under image intensifier was higher in the group treated with distractor on either side than those with distractor only on radial side. 展开更多
关键词 FRACTURE Distal Radius Plaster Cast DISTRACTOR RADIAL Length RADIAL Angle Intra Carpal Step Off PALMAR Tilt Fischer’s Test P-Value
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Comparison between Different Modalities of Treatment of Ewing Sarcoma
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作者 Ranadeb Bandyopadhyay arindam mukherjee Ujjal Bhakat 《Open Journal of Orthopedics》 2012年第2期69-72,共4页
Background: Ewing sarcoma is the most common primary malignant tumour in patients younger than 10 years of age. The incidence is less than 1 per 1 million per year. Usually it is located in the diaphysis of long bones... Background: Ewing sarcoma is the most common primary malignant tumour in patients younger than 10 years of age. The incidence is less than 1 per 1 million per year. Usually it is located in the diaphysis of long bones. Prognosis of these tumours has improved dramatically since the introduction of multi-agent chemotherapy, from an erstwhile 10% survival rate to the current 70% for patients with non-metastatic Ewing sarcoma. Method: A retrospective review of patients with histologically confirmed Ewing sarcoma who were treated in the Department of Orthopaedics, B.S. Medical College during the time period from April 2000 to March 2012 was performed. Patients were divided into two groups: Group A included those treated by External Beam Radiotherapy (EBRT) + chemotherapy while Group B included the patients treated with surgery + chemotherapy. Results were analysed depending on the survival rates. Kaplan-Meier survival curves were compared using log-rank test and a multivariate Cox proportional hazards model was calculated. Result: The survival curves of both the groups were not found to be significantly different. Conclusion: Treatment of Ewing tumour has multiple options. No one treatment modality is superior. Survival rates of patients treated by radiation + chemotherapy are not significantly different from those treated with surgery + chemotherapy. 展开更多
关键词 EWING SARCOMA EBRT Chemotherapy Surgery Kaplan-Meier Survival CURVES COX Proportional Hazards Model
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Case Report: A Rare Variety of Type 4 Monteggia Fracture Dislocation in A 28 Years Old Man
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作者 Ranadeb Bandyopadhyay arindam mukherjee 《Open Journal of Orthopedics》 2012年第2期47-50,共4页
A Monteggia fracture is a fracture of the proximal ulna coupled with a radial head dislocation. Numerous classification systems have been developed to characterize these fractures. Bado classification is most commonly... A Monteggia fracture is a fracture of the proximal ulna coupled with a radial head dislocation. Numerous classification systems have been developed to characterize these fractures. Bado classification is most commonly used. Bado type 1 Monteggia fractures are most common while type 3 & 4 are rare entities. In our case, after confirming the diagnosis as type 4 Bado Monteggia fracture dislocation, patient was posted for open reduction and internal fixation. The ulnar and radial fractures were rigidly fixed with 3.5 compression plate and ulnar length restored. However, the radial head was still found to be dislocated anteriorly on fluoroscopy. An attempt of closed reduction of the radial head failed. Open reduction of the radial head was performed under image intensifier and fixed with a Kirschner’s wire followed by immobilization in hyperflexion for 2 weeks. The patient followed up at the end of 2 weeks, 4 weeks and 6 weeks following injury and gradual mobilisation of the elbow joint was made. Further follow up at 6 months and 1 year showed complete return of routine function. As soon as the ulnar length is restored by rigid internal fixation, radial head is itself reduced in majority of Monteggia fracture dislocation where only ulnar fracture is involved. However, in cases of both bone forearm fracture with radial head dislocation, even after restoring the length of ulna and radius, operative reduction of radial head is essential. 展开更多
关键词 MONTEGGIA Fracture Bado Classification RIGID FIXATION OPERATIVE Reduction
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Role of Neo-Adjuvant Chemotherapy in the Treatment of Osteosarcoma
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作者 Ranadeb Bandyopadhyay arindam mukherjee Bishan Basu 《Open Journal of Orthopedics》 2012年第2期25-29,共5页
Osteosarcoma is a tumour characterized by the production of osteoid by malignant cells. The incidence is approximately 1 to 3 million/year. The incidence is slightly higher in males. Onset can occur at any age;however... Osteosarcoma is a tumour characterized by the production of osteoid by malignant cells. The incidence is approximately 1 to 3 million/year. The incidence is slightly higher in males. Onset can occur at any age;however, primary high grade osteosarcoma usually occurs in the second decade of life. Historically patients with osteosarcoma were treated with immediate wide or radical amputation. Despite the treatment, 80% patients with apparently isolated disease died of distant metastases. In recent years the number of patients with osteosarcoma of the limb treated by amputation + chemotherapy has increased. In our study, we divided the patients into two groups. One group (A) was treated with amputation + adjuvant chemotherapy. The other group (B) was treated with neo-adjuvant chemotherapy + amputation followed by adjuvant-chemotherapy. In our study, the margin negativity in post surgical specimen was significantly higher (P-value 0.0007) for the group treated with neo-adjuvant chemotherapy. Local recurrence in the group treated without neoadjuvant chemotherapy was significantly more (P-value 0.0005).The systemic recurrence at the end of 6 months was higher the group treated without neoadjuvant chemotherapy (P-value 0.0169).However systemic recurrence between 6 months -1 year and 1 year - 2 years were not significant(P-values 0.1501 and 0.4902). From the above figures it may be concluded that treatment with neo-adjuvant chemotherapy + amputation + adjuvant chemotherapy had definite advantages over upfront amputation + adjuvant chemotherapy.) 展开更多
关键词 OSTEOSARCOMA AMPUTATION Neo-Adjuvant CHEMOTHERAPY ADJUVANT CHEMOTHERAPY
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