期刊文献+
共找到16篇文章
< 1 >
每页显示 20 50 100
多绳摩擦提升机容器防滑自重的研究 被引量:1
1
作者 邵林波 《昆明理工大学学报(理工版)》 2003年第2期38-41,共4页
用安全规程规定的减速度确定出的容器自重,能满足静、动防滑安全系数检验,也满足各种状态下紧急制动防滑要求,避免了传统设计中容器防滑自重反复调整,反复修正和校验,造成计算的重复、繁琐、设计周期长等弊端,使设计非常简便,安全可靠。
关键词 多绳摩擦提升机 容器滑自重 安全规程 滑安全系数 滑安全系数 紧急制动 滑动极限减速度
下载PDF
多绳摩擦式提升机防滑验算及分析 被引量:9
2
作者 韩建秋 杨金艳 《黄金》 CAS 北大核心 2008年第12期30-31,共2页
多绳摩擦式提升机在冶金矿山应用十分普遍,其防滑验算十分必要。通过对多绳摩擦式提升机防滑验算及分析,提出了防滑验算的具体公式和完整步骤,使多绳摩擦式提升机防滑校核得到了进一步完善,同时也为矿山设计带来方便。
关键词 多绳摩擦式提升机 滑验算 安全制动
下载PDF
凹版印刷中的静电解决方案
3
作者 胡国良 《塑料包装》 CAS 2014年第5期44-45,43,共3页
静电一方面是对印刷的产品品质造成一定的影响,如出现拉丝、飞墨、爆点或重影现象等。另一方面是对操作人员造成一定的伤害,离近操作时有被电击感,影响生产效率,潜藏安全隐患,甚至在一些场合因瞬间静电值过大而引起静电放电引燃火灾,造... 静电一方面是对印刷的产品品质造成一定的影响,如出现拉丝、飞墨、爆点或重影现象等。另一方面是对操作人员造成一定的伤害,离近操作时有被电击感,影响生产效率,潜藏安全隐患,甚至在一些场合因瞬间静电值过大而引起静电放电引燃火灾,造成不可挽回的损失。 展开更多
关键词 电解决方案 凹版印刷 电消除器电棒防静 电火灾 安平 感应式 电离子棒 凹印机消除 色组除
下载PDF
管道清扫机器人的研究及在粮油行业中的应用
4
作者 马宏燕 朱金秋 《现代食品》 2024年第7期5-9,共5页
针对现有管道清扫机器人的工作原理、结构、特点、存在的问题,对其结构进行新的设计。新设计的自动行走、粉尘防爆、长度定位和多模式操作,具有结构简便、电气粉尘防爆的优点,该新设计的多模式操作适用于多种集尘环境的清扫工作,同时拓... 针对现有管道清扫机器人的工作原理、结构、特点、存在的问题,对其结构进行新的设计。新设计的自动行走、粉尘防爆、长度定位和多模式操作,具有结构简便、电气粉尘防爆的优点,该新设计的多模式操作适用于多种集尘环境的清扫工作,同时拓展了粉尘防爆场合的应用。最后阐述了该新设计的优点、特点及其使用前景。 展开更多
关键词 管道清扫 粉尘 牵引机 防静电刷头 长度定位
下载PDF
摩擦提升系统静张力比与防滑安全系数的探讨
5
作者 杨勇 《矿山机械》 2024年第3期28-32,共5页
防滑验算是摩擦提升系统的重要环节。引入静张力比为特定值的情况,通过推导理论公式,结合国家现行规程规范的要求,分析静张力比和摩擦提升系统的静、动防滑安全的一般关系,方便直观快速判断系统的防滑关系。
关键词 摩擦提升系统 张力比 滑安全系数 滑安全系数
原文传递
多绳摩擦提升下放货载滑动危险点分析 被引量:2
6
作者 马良 薛风 《煤矿机械》 北大核心 2014年第12期138-140,共3页
对多绳摩擦提升下放货载等重尾绳、重尾绳和轻尾绳3种提升系统的静、动防滑安全系数进行比较,静防滑安全系数以轻尾绳提升终了时为最小,动防滑安全系数以轻尾绳提升减速阶段终了时为最小。即下放货载轻尾绳静、动防滑安全系数满足要求时... 对多绳摩擦提升下放货载等重尾绳、重尾绳和轻尾绳3种提升系统的静、动防滑安全系数进行比较,静防滑安全系数以轻尾绳提升终了时为最小,动防滑安全系数以轻尾绳提升减速阶段终了时为最小。即下放货载轻尾绳静、动防滑安全系数满足要求时,等重尾绳、重尾绳静、动防滑安全系数可以满足要求。 展开更多
关键词 等重尾绳 重尾绳 轻尾绳 滑安全系数 滑安全系数
下载PDF
现代F5系列优盘
7
《大众硬件》 2003年第3期13-13,共1页
关键词 现代F5系列优盘 标准USB接口 防静 抗震 耐高低温
下载PDF
Hemodynamic effects of propranolol with spironolactone in patients with variceal bleeds: A randomized controlled trial 被引量:3
8
作者 Binay K De Deep Dutta +3 位作者 Rimi Som Pranab K Biswas Subrata K Pal Anirban Biswas 《World Journal of Gastroenterology》 SCIE CAS CSCD 2008年第12期1908-1913,共6页
AIM: To study the hemodynamic effects of spironolactone with propranolol vs propranolol alone in the secondary prophylaxis of variceal bleeding. METHODS: Thirty-five cirrhotics with variceal bleeding randomly received... AIM: To study the hemodynamic effects of spironolactone with propranolol vs propranolol alone in the secondary prophylaxis of variceal bleeding. METHODS: Thirty-five cirrhotics with variceal bleeding randomly received propranolol (n = 17: Group A) or spironolactone plus propranolol (n = 18: Group B). Hemodynamic assessment was performed at baseline and on the eighth day. RESULTS: Spironolactone with propranolol caused a greater reduction in the hepatic venous pressure gradient than propranolol alone (26.94% vs 10.2%; P < 0.01). Fourteen out of eighteen patients on the combination treatment had a reduction in hepatic venous pressure gradient to ≤ 12 mmHg or a 20% reduction from baseline in contrast to only six out of seventeen (6/17) on propranolol alone (P < 0.05). CONCLUSION: Spironolactone with propranolol results in a better response with a greater reduction in hepatic venous pressure gradient in the secondary prophylaxis of variceal bleeding. A greater number of patients may be protected by this combination therapy than by propranolol alone. Hence, this combination may be recommended for secondary prophylaxis in patients with variceal bleeding. 展开更多
关键词 Hepatic venous pressure gradient Secondary prophylaxis SPIRONOLACTONE PROPRANOLOL Varicealbleeding
下载PDF
Venous thromboembolism prophylaxis in hospitalized elderly patients: Time to consider a 'MUST' strategy 被引量:6
9
作者 Kwok M Ho Edward Litton 《Journal of Geriatric Cardiology》 SCIE CAS CSCD 2011年第2期114-120,共7页
Venous thromboembolism (VTE) is the commonest cause of preventable death in hospitalized patients. Elderly patients have higher risk of VTE because of the high prevalence of predisposing co-morbidities and acute ill... Venous thromboembolism (VTE) is the commonest cause of preventable death in hospitalized patients. Elderly patients have higher risk of VTE because of the high prevalence of predisposing co-morbidities and acute illnesses. Clinical diagnosis of VTE in the elderly patient is particularly difficult and, as such, adequate VTE prophylaxis is of pivotal importance in reducing the mortality and morbidities of VTE. Omission of VTE prophylaxis is, however, very common despite continuous education. A simple way to overcome this problem is to implement universal VTE prophylaxis for all hospitalized elderly patients instead of selective prophylaxis for some patients only according to individual' s risk of VTE. Although pharmacological VTE prophylaxis is effective for most patients, a high prevalence of renal impairment and drug interactions in the hospitalized elderly patients suggests that a multimodality approach may be more appropriate. Mechanical VTE prophylaxis, including calf and thigh compression devices and/or an inferior vena cava filter, are often underutilized in hospitalized elderly patients who are at high-risk of bleeding and VTE. Because pneumatic compression devices and thigh length stockings are virtually risk free, mechanical VTE prophylaxis may allow early or immediate implementation of VTE prophylaxis for all hospitalized elderly patients, regardless of their bleeding and VTE risk. Although the cost-effectiveness of this Multimodality Universal STat ('MUST') VTE prophylaxis approach for hospitalized elderly patients remains uncertain, this strategy appears to offer some advantages over the traditional 'selective and single-modal' VTE prophylaxis approach, which often becomes 'hit or miss' or not implemented promptly in many hospitalized elderly patients. A large clustered randomized controlled trial is, however, needed to assess whether early, multimodality, universal VTE prophylaxis can improve important clinical outcomes of hospitalized elderly patients. 展开更多
关键词 age bundle of care deep vein thrombosis PREVENTION pulmonary embolism
下载PDF
Transjugular intrahepatic portosystemic shunt vs endoscopic therapy in preventing variceal rebleeding 被引量:18
10
作者 Hui Xue Meng Zhang +7 位作者 Jack XQ Pang Fei Yan Ying-Chao Li Liang-Shan Lv Jia Yuan Muna Palikhe Wei-Zhi Li Zhi-Lun Wang 《World Journal of Gastroenterology》 SCIE CAS CSCD 2012年第48期7341-7347,共7页
AIM:To compare early use of transjugular intrahepatic portosystemic shunt(TIPS) with endoscopic treatment(ET) for the prophylaxis of recurrent variceal bleeding.METHODS:In-patient data were collected from 190 patients... AIM:To compare early use of transjugular intrahepatic portosystemic shunt(TIPS) with endoscopic treatment(ET) for the prophylaxis of recurrent variceal bleeding.METHODS:In-patient data were collected from 190 patients between January 2007 and June 2010 who suffured from variceal bleeding.Patients who were older than 75 years;previously received surgical treatment or endoscopic therapy for variceal bleeding;and complicated with hepatic encephalopathy or hepatic cancer,were excluded from this research.Thirty-five cases lost to follow-up were also excluded.Retrospective analysis was done in 126 eligible cases.Among them,64 patients received TIPS(TIPS group) while 62 patients received endoscopic therapy(ET group).The relevant data were collected by patient review or telephone calls.The occurrence of rebleeding,hepatic encephalopathy or other complications,survival rateand cost of treatment were compared between the two groups.RESULTS:During the follow-up period(median,20.7 and 18.7 mo in TIPS and ET groups,respectively),rebleeding from any source occurred in 11 patients in the TIPS group as compared with 31 patients in the ET group(Kaplan-Meier analysis and log-rank test,P = 0.000).Rebleeding rates at any time point(6 wk,1 year and 2 year) in the TIPS group were lower than in the ET group(Bonferroni correction α' = α/3).Eight patients in the TIPS group and 16 in the ET group died with the cumulative survival rates of 80.6% and 64.9%(Kaplan-Meier analysis and log-rank test c2 = 4.864,P = 0.02),respectively.There was no significant difference between the two groups with respect to 6-wk survival rates(Bonferroni correction α' = α/3).However,significant differences were observed between the two groups in the 1-year survival rates(92% and 79%) and the 2-year survival rates(89% and 64.9%)(Bonferroni correction α' = α/3).No significant differences were observed between the two treatment groups in the occurrence of hepatic encephalopathy(12 patients in TIPS group and 5 in ET group,KaplanMeier analysis and log-rank test,c2 = 3.103,P = 0.08).The average total cost for the TIPS group was higher than for ET group(Wilcxon-Mann Whitney test,52 678 RMB vs 38 844 RMB,P < 0.05),but hospitalization frequency and hospital stay during follow-up period were lower(Wilcxon-Mann Whitney test,0.4 d vs 1.3 d,P = 0.01;5 d vs 19 d,P < 0.05).CONCLUSION:Early use of TIPS is more effective than endoscopic treatment in preventing variceal rebleeding and improving survival rate,and does not increase occurrence of hepatic encephalopathy. 展开更多
关键词 Transjugular intrahepatic portosystemic shunt Portal hypertension Rebleeding Endoscopicvariceal ligation Cyanoacrylate
下载PDF
Prophylactic antibiotics for variceal hemorrhage: Clostridium difficile infection still can be a risk 被引量:1
11
作者 Naohiro Okano Kentaro Iwata 《World Journal of Gastroenterology》 SCIE CAS CSCD 2011年第18期2356-2356,共1页
Bron et al presented a retrospective study regarding the prophylactic use of antibiotics for variceal hemorrhage. Antibiotics appeared to improve the survival rate of patients without increasing clostridium difficile ... Bron et al presented a retrospective study regarding the prophylactic use of antibiotics for variceal hemorrhage. Antibiotics appeared to improve the survival rate of patients without increasing clostridium difficile infection (CDI). We argue against the conclusion of the authors and consider that this result may be simply due to concurrent use of metronidazole, a therapeutic agent against CDI. 展开更多
关键词 Variceal hemorrhage Prophylactic antibiotics Clostridium difficile infection
下载PDF
Role of calcium and magnesium infusion in prevention of oxaliplatin neurotoxicity. A phase III trial 被引量:1
12
作者 Nagy Samy Gobran 《The Chinese-German Journal of Clinical Oncology》 CAS 2013年第5期232-236,共5页
Objective: This study is a prospective randomized, double-blind, placebo-controlled study to evaluate the effect of calcium and magnesium (Ca/Mg) infusion on amelioration of oxaliplatin neuropathy, the dose-limitin... Objective: This study is a prospective randomized, double-blind, placebo-controlled study to evaluate the effect of calcium and magnesium (Ca/Mg) infusion on amelioration of oxaliplatin neuropathy, the dose-limiting toxicity. Methods: Sixty patients with resected colorectal carcinoma (CRC) planned to receive adjuvant oxaliplatin-containing regimen were randomly assigned to two arms; Arm A: patients received Ca/Mg were given as 1 gm Ca gluconate and 1 gm MgSO4 in 250 mL of intravenous (IV) solution over 30 rain pre and post oxaliplatin infusion, and Arm B: patients received 250 mL of IV solution without Ca/Mg over 30 min pre and post oxaliplatin infusion. Primary outcome was to assess percentage of patients with oxaliplatin-induced neurotoxicity. Neurotoxicity was assessed according to the National Cancer Institute Common Terminology Criteria forAdverse Events (NCI-CTCAE) version 3.0. Results: Sixty patients in both arms were assessed, 30 with Ca/Mg infusion and 30 without. Patients developed neurotoxicity in arm A were significantly lower than that in arm B after the end of treatment; 7 (23.3%) and 14 (46.6%) respectively (P 〈 0.05), and significantly lower duration of neuropathy in months (8 ± 2.5 vs 18 ±3) respectively (P 〈 0.001). Conclusion: Use of IV Ca/Mg showed a statistically significant reduction of peripheral neuropathy (PN) in patients with CRC receiving oxaliplatin in the adjuvant settings. 展开更多
关键词 colorectal carcinoma (CRC) oxaliplatin neurotoxicity calcium and magnesium (Ca/Mg)infusion
下载PDF
单容器摩擦提升机防滑安全研究
13
作者 胡婷婷 谢丽蓉 +2 位作者 穆塔里夫.阿赫迈德 常一峰 高磊 《煤矿安全》 北大核心 2017年第5期69-72,76,共5页
单容器摩擦提升机,摩擦轮两侧张力差的大小,随着容器侧的运动状态及载重的变化而变化,而张力差的变化直接影响到系统的安全运行。针对单容器摩擦提升系统,在欧拉公式的基础上,基于静张力比相等原则,建立了静张力比与加速度及静防滑安全... 单容器摩擦提升机,摩擦轮两侧张力差的大小,随着容器侧的运动状态及载重的变化而变化,而张力差的变化直接影响到系统的安全运行。针对单容器摩擦提升系统,在欧拉公式的基础上,基于静张力比相等原则,建立了静张力比与加速度及静防滑安全系数之间的数学关系,采用Matlab仿真,分别获得了两者之间的变化关系图,得出了系统在各种情况下的防滑条件。 展开更多
关键词 矿井提升 单容器摩擦提升机 张力比 滑安全系数 MATLAB
原文传递
Perioperative treatment of femoral neck fracture with deep venous thrombosis: A case report 被引量:12
14
作者 Ming Liu Lei Liu Fuguo Huang Yue Fang Gang Zhong Zhou Xiang 《Chinese Journal of Traumatology》 CAS CSCD 2015年第2期109-112,共4页
Deep venous thrombosis (DVT) is an important cause of disability and mortality after major orthopedic surgery. The roles of perioperative treatment and prevention of DVT in patients with femoral neck fractures who r... Deep venous thrombosis (DVT) is an important cause of disability and mortality after major orthopedic surgery. The roles of perioperative treatment and prevention of DVT in patients with femoral neck fractures who require major surgery have not yet been well explored in Chinese clinical practice. Here we report a case of calf muscular venous thrombosis in a 55-year-old woman with femoral neck fracture before surgery. Preventive and treatment measures including the administration of heparin sodium, application of venous foot pump and placement of inferior vena cava filter were taken. The condition of the patient was stable during the perioperative period and the surgery was successful. Besides, postoperative examination showed that the femur healed well and the functional recovery was satisfactory. Our results suggest that femoral neck fracture patients combined with DVT can receive surgery after accurate preoperative assessment and proper preoperative treatment. 展开更多
关键词 Femoral neck fractures Calf muscular venous thrombosis Venous thrombosis
原文传递
A comparative study of preventing postoperative tendon adhesion using electrospun polyester membranes with different degradation kinetics
15
作者 Zhiming Song Bo Shi +4 位作者 Jianxun Ding Xiuli Zhuang Xiaonan Zhang Changfeng Fu Xuesi Chen 《Science China Chemistry》 SCIE EI CAS CSCD 2015年第7期1159-1168,共10页
Complications arising from tendon injury include tendon sheath infection and peritendinous adhesion, in which tendon adhesion often leads to serious motor dysfunction. In this work, the electrospun membranes of poly(L... Complications arising from tendon injury include tendon sheath infection and peritendinous adhesion, in which tendon adhesion often leads to serious motor dysfunction. In this work, the electrospun membranes of poly(L-lactide)(PLA) and poly(ε-caprolactone)(PCL) with different degradation kinetics were used to investigate their efficacy for anti-adhesion toward Achilles tendon repair. Compared with the PCL membrane, the PLA sample showed a faster rate of degradation in 42 d, and all the degradation media(i.e., phosphate-buffered saline) maintained at a constant p H of around 7.4. Meanwhile, the superior biocompatibility of both the PLA and PCL membranes were proved by the in vitro cellular adhesion tests and in vivo histopathological assays. Simultaneously, the PLA membrane was more effective than the PCL sample in decreasing adhesion and promoting functional recovery. Furthermore, the experiment result was further confirmed by hematoxylin-eosin and Masson's trichrome staining, and type I collagen immunohistochemical analysis. All results revealed that the model treated with the electrospun PLA membrane was obviously better with regard to both anti-adhesion and tendon repair than that in the PCL membrane group. Considering the results of degradation and adhesion prevention efficacy, the electrospun polyester membranes, especially the PLA one, would be applied with fascinating potential in clinical prevention of postoperative tendon adhesion. 展开更多
关键词 ANTI-ADHESION Achilles tendon repair BIODEGRADABILITY electrospun membrane poly(L-lactide) poly(ε-caprolactone)
原文传递
Recent advances in the management of variceal bleeding 被引量:7
16
作者 Ihteshamul Haq Dhiraj Tripathi 《Gastroenterology Report》 SCIE EI 2017年第2期113-126,I0001,共15页
Acute haemorrhage from ruptured gastroesophageal varices is perhaps the most serious consequence of uncontrolled portal hypertension in cirrhotic patients.It represents a medical emergency and is associated with a hig... Acute haemorrhage from ruptured gastroesophageal varices is perhaps the most serious consequence of uncontrolled portal hypertension in cirrhotic patients.It represents a medical emergency and is associated with a high morbidity and mortality.In those who survive the initial bleeding event,the risks of further bleeding and other decompensated events remain high.The past 30 years have seen a slow evolution of management strategies that have greatly improved the chances of surviving a variceal haemorrhage.Liver cirrhosis is a multi-staged pathological process and we are moving away from a one-size-fits-all therapeutic approach.Instead there is an increasing recognition that a more nuanced approach will yield optimal survival for patients.This approach seeks to risk stratify patients according to their disease stage.The exact type and timing of treatment offered can then be varied to suit individual patients.At the same time,the toolbox of available therapy is expanding and there is a continual stream of emerging evidence to support the use of endoscopic and pharmacological therapies.In this review,we present a summary of the treatment options for a variety of different clinical scenarios and for when there is failure to control bleeding.We have conducted a detailed literature review and presented up-to-date evidence from either primary randomized-controlled trials or meta-analyses that support current treatment algorithms. 展开更多
关键词 VARICES acute varices haemorrhage CIRRHOSIS PROPHYLAXIS non-selective beta-blockers variceal band ligation
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部