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Research on the Mechanism and Prevention of Rockburst at the Yinxin Gold Mine

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Journal of China University of Mining and Technology 2007年第4期17卷 541-545页

作者： ZHANG Xiao-chun wang jun-qiang Traffic and Communications College Southeast University Nanjing Jiangsu 210096 China Lingbao Gold Company Ltd Lingbao Henan 472500 China

The occurrence and nature of shaft rockburst in the Yinxin gold mine are recorded and analyzed. Rockburst happens along an obvious south-north orientation. The ground and surrounding rock stresses are measured in this mine. The research indicates that the directivity of rockburst is closely related to geological structure and to abnormal distri-bution of ground stress in some parts of the mining area. The mechanism of past rockbursts is discussed based upon the theory of fracture mechanics. Some rockburst release measures and their execution in the Yinxin Gold Mine are de-scribed. These measures have been successful in eliminating rockburst.

关键词： rockburst geological tectonic stress crack extension shaft release technology

Effects of cyhalothrin on the transient outward potassium current in central neurons of Helicoverpa armigera

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Insect Science 2006年第1期13卷 13-17页

作者： YONG wang BING-jun HE qiang ZHAO ZHI LIANG AN-XI LIU College of Life Science Nankai Univerity Tianjin China

The effects of cyhalothrin on the transient outward potassium current in central neurons of Helicoverpa armigera were studied by using the patch clamp techniques. The results showed that before using cyhalothrin （10.5 mmol/L）, activation potential was approximately -40 mV, after application of the drug, the activation potential shifted roughly 10 mV to the negative potential direction, so channels can be activated more easily. Before and after cyhalothrin application, the change of current amplitude was insignificant. The value of V1/2 and k of activation curves did not change significantly, however, the V1/2 of the inactivation curves changed significantly. Inactivation curves significantly shifted to a negative direction, so that inactivation of the channels was hastened. It is indicated that there may exit a primary way in which cyhalothrin provides neurotoxicity to the nervous system through the regulation of activation potentials and inactivation state of IA channels.

关键词： cyhalothrin Helicoverpa armigera patch clamp potassium channel

Study of dynamic pressure roadway supporting scheme under condi- tion of thick composite roof

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Journal of Coal Science & Engineering(China) 2013年第2期19卷 119-125页

作者： Wei-jun wang Li-qiang LUO Wei-Jian YU Hai WU Yan-Si QU Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines Hunan University of Science and TechnologyXiangtan 411201 China

This paper analyzed the strata behaviors of solid-coal roadway, gob-side entry driving and deformation law of surrounding rock in depth under high stress and thick composite roof based on the dynamic pressure roadway as engineering background in Fengcheng mining area, Jiangxi province. The results, both field measurement and numerical simulation show that gob-side entry driving results the deformation of coal roadway main wall, however, entity-coal roadway driving results deformation of main roof and floor. The maintenance state of gob-side entry driving is better than entity-coal roadway, this situation is relevant to thick composite roof layered and easy collapse characteristics. At the same time, this paper put fox＇ward and proved proper dynamic pressure roadway supporting scheme under the surrounding rock condition and stress environment.

关键词： thick composite roof dynamic pressurized roadway high stress surrounding rock control

Role of interventional endovascular therapy for delayed hemorrhage after pancreaticoduodenectomy

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Chinese Medical Journal 2010年第21期123卷 3110-3117页

作者： wang Zhi-jun wang Mao-qiang LIU Feng-yong DUAN Feng SONG Peng FAN Qing-sheng Department of Interventional Radiology Chinese People's Liberation Army General Hospital Beijing 100853 China

Background Delayed massive hemorrhage （DMH） after pancreaticoduodenectomy （PD） is a sedous complication and one of the most common causes of mortality after PD. Its ideal management remains unclear. This paper is to present our experience in the endovascular treatment of patients with DMH after PD using different techniques and *** During a seven years period, 19 patients （fifteen men, four women） with DMH arter PD were treated with endovascular procedures, including transcatheter arterial embolization （TAE） with coils embolization in eight cases, with coils plus N-butyl-2-cyanoacrylate （NBCA）-Lipiodol mixture in six cases, and stent-graft placement in five cases. The mean age of the patients was 58.2 years. Follow-up, including clinical condition, liver function tests, and Doppler ultrasound examinations, was *** The immediate technical success rate was 84.2% （16/19）. There were no significant procedure-related complications. Hemostasis was not achieved with interventional procedures in three patients： one died of uncontrolled bleeding four days after the second TAE, and two patients required emergency laparotomy without re-angiography because of worsening clinical status. Among the 16 patients with successfully stopped bleeding who became hemodynamically stable after the procedure without evidence of further bleeding, two patients died during the peri-interventional procedure period because of multiple organ failure, and fourteen patients survived to hospital discharge. The mean length of follow-up was 14.6 months. Recurrent bleeding after discharge did not occur in any of these cases. Clinical and laboratory follow-up findings were unremarkable. Doppler ultrasound examinatation verified patency of the hepatic artery in the four patients with stent-graft placement during the follow-up period （5 months-29 months; mean, 15.3 months）.Conclusions Interventional endovascular procedure is a safe and technically feasible solution to control D

关键词： pancreaticoduodenectomy delayed massive hemorrhage hepatic artery pseudoaneurysm interventional radiology

Systematic review of D2 lymphadenectomy versus D2 with para-aortic nodal dissection for advanced gastric cancer

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World Journal of Gastroenterology 2010年第9期16卷 1138-1149页

作者： Zhen wang,jun-qiang Chen,Yun-Fei Cao,Department of Gastrointestinal Surgery,the First Affiliated Hospital of Guangxi Medical University,6 Shuangyong Road,Nanning 530021,Guangxi Zhuang Autonomous Region,China Department of Gastrointestinal Surgery The First Affiliated Hospital of Guangxi Medical University 6 Shuangyong Road Nanning 530021 Guangxi Zhuang Autonomous Region China. gxmufh@***

AIM:To evaluate the feasibility and therapeutic effects of para-aortic nodal dissection (PAND) for advanced gastric ***:Randomized controlled trials (RCTs) and non-randomized studies comparing D2 + PAND with D2 lymphadenectomy were identified using a predefined search ***-year overall survival rate,post-operative mortality,and wound degree of surgery between the two operations were compared by using the methods provided by the Cochrane Handbook for Systematic Reviews of ***:Four RCTs (1120 patients) and 4 nonrandomized studies (901 patients) were identif *** showed that there was no signif icant difference between these two groups in 5-year overall survival rate [risk ratio (RR) 1.04 (95% CI:0.93-1.16) for RCTs and 0.96 (95% CI:0.83-1.10) for non-randomized studies] and post-operative mortality [RR 0.99 (95% CI:0.44-2.24) for RCTs and 2.06 (95% CI:0.69-6.15) for non-randomized studies].There was a significant difference between these two groups in wound degree of surgery,operation time was significantly longer [weighted mean difference (WMD) 195.32 min (95% CI:114.59-276.05) for RCTs and 126.07 min (95% CI:22.09-230.04) for non-randomized studies] and blood loss was signif icantly greater [WMD 301 mL (95% CI:151.55-450.45) for RCTs and 302.86 mL (95% CI:127.89-477.84) for non-randomized studies] in D2 + ***:D2 + PAND can be performed as safely as standard D2 resection without increasing post-operative mortality but fail to benefit overall survival in patients with advanced gastric cancer.

关键词： Systematic review Meta-analysis Gastric cancer D2 lymphadenectomy Para-aortic nodal dissection

Computer-assisted navigation systems for insertion of cannulated screws in femoral neck fractures： a comparison of bi-planar robot navigation with optoelectronic navigation in a Synbone hip model trial

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Chinese Medical Journal 2011年第23期124卷 3906-3911页

作者： wang jun-qiang ZHAO Chun-peng SU Yong-gang ZHOU Li HU Lei wang Tian-miao wang Man-yi Department of Orthopaedics and Traumatology Beijing Jishuitan Hospital Beijing 100035 China

Computer-assisted procedures have recently been introduced for navigated femoral neck screw placement. Currently there is little information available regarding accuracy and efficiency of the different navigated procedures. The aim of this study was to compare two fluoroscopic navigation tracking technologies, a novel bi-planar robot navigation and standardized optoelectronic navigation, versus standard freehand fluoroscopic insertion in a Synbone hip model. Methods Eighteen fixed Synbone hip models were divided into 3 groups. C-arm navigated cannulated screws （AO-ASIF, diameter 7.3 mm） were inserted using freehand targeting （control group）. A novel bi-planar robot system （TINAV, GD2000） and an optoelectronic system （Stryker OTS Navigation System） were used for the navigated procedures （robot group and optoelectronic group）. Accuracy was measured using radiographic evaluation including the measurement of screw parallelism and decentralization, and joint penetration. To evaluate the efficiency, the number of guidewire passes, operative time and fluoroscopic images taken were noted. Results The two computer-assisted systems provided significantly improved accuracy compared to the freehand technique. Each of the parameters, including guidewire passes and number of fluoroscopy images, was significantly lower when using the computer-assisted systems than for freehand-unguided insertion （P 〈0.05）, but operative time was significantly shorter when using freehand-unguided insertion than for the computer-assisted systems （P 〈0.05）. Accuracy, operative time and number of fluoroscopy images taken were similar among the two navigated groups （P 〉0.05）, but guidewire passes in the robot group were significantly less than in the optoelectronic group （P 〈0.05）. Conclusions Both bi-planar robot navigation and optoelectronic navigation were similarly accurate and have the potential to improve accuracy and reduce radiation for freehand fluoroscopic targeting for insertion of cannulate

关键词： femoral neck," computer-assisted navigation screw fixation

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非晶合金的磁热效应及磁蓄冷性能

物理学报 2017年第17期66卷 282-299页

作者：霍军涛盛威王军强中国科学院宁波材料技术与工程研究所中国科学院磁性材料与器件重点实验室宁波315201

非晶合金的功能物性开发是突破非晶合金应用瓶颈的关键点之一.磁相变是非晶合金的一个重要特征.利用非晶合金的磁相变所带来的独特效应,可以将其应用于制冷领域.一方面非晶合金的磁热效应可以作为磁制冷材料应用于磁制冷机,另一方面非... 详细信息

非晶合金的功能物性开发是突破非晶合金应用瓶颈的关键点之一.磁相变是非晶合金的一个重要特征.利用非晶合金的磁相变所带来的独特效应,可以将其应用于制冷领域.一方面非晶合金的磁热效应可以作为磁制冷材料应用于磁制冷机,另一方面非晶合金的比热突变可以作为磁蓄冷材料应用于低温制冷机.本文就非晶合金的磁热效应和磁蓄冷性能的原理、特征及其应用前景进行了详细介绍.

关键词：非晶合金磁热效应磁蓄冷性能

Percutaneous Sacroiliac Screw Placement： A Prospective Randomized Comparison of Robot？assisted Navigation Procedures with a Conventional Technique

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Chinese Medical Journal 2017年第21期130卷 2527-2534页

作者： jun-qiang wang Yu wang Yun Feng Wei Han Yong-Gang Su Wen-Yong Liu Wei-jun Zhang Xin-Bao Wu Man-Yi wang Yu-Bo Fan School of Biological Science and Medical Engineering Beihang University Beijing 100191 China Department of Orthopaedic Trauma Beijing Jishuitan Hospital Beijing 100035 China TINAVI Medical Technologies Company Limited Beijing 100192 China Medical Robot Engineering Laboratory of Beijing Beijing 100192 China

Background： Sacroiliac （SI） screw fixation is a demanding technique, with a high rate of screw malposition due to the complex pelvic anatomy. TiRobot- is an orthopedic surgery robot which can be used for SI screw fixation. This study aimed to evaluate the accuracy of robot-assisted placement of SI screws compared with a freehand technique. Methods：Thirty patients requiring posterior pelvic ring stabilization were randomized to receive freehand or robot-assisted SI screw fixation, between January 2016 and june 2016 at Beijing Jishuitan Hospital. Forty-five screws were placed at levels S1 and S2. In both methods, the primary end point screw position was assessed and classified using postoperative computed tomography. Fisher＇s exact probability test was used to analyze the screws＇positions. Secondary end points, such as duration of trajectory planning, surgical time after reduction of the pelvis, insertion time for guide wire, number of guide wire attempts, and radiation exposure without pelvic reduction, were also assessed. Results： Twenty-three screws were placed in the robot-assisted group and 22 screws in the freehand group; no postoperative complications or revisions were reported. The excellent and good rate of screw placement was 100% in the robot-assisted group and 95% in the freehand group. The P value （0.009） showed the same superiority in screw distribution. The fluoroscopy time after pelvic reduction in the robot-assisted group was significantly shorter than that in the freehand group （median [Q1, Q3]： 6.0 [6.0, 9.0] s vs. median [Q1, Q3]： 36.0 [21.5, 48.0] s; χ2 = 13.590, respectively, P 〈 0.001）; no difference in operation time after reduction of the pelvis was noted （χ2 = 1.990, P = 0.158）. Time for guide wire insertion was significantly shorter for the robot-assisted group than that for the freehand group （median [Q1, Q3]： 2.0 [2.0, 2.7] min vs. median [Q1, Q3]： 19.0 [15.5, 45.0] min; χ2 = 20.952, respectively, P 〈 0.001）. The number of guide wire attem

关键词： Computer-Assisted Pelvic Injuries Percutaneous Screw Placement Robotics Sacroiliac Screw Surgery

Printed Three-dimensional Anatomic Templates for Virtual Preoperative Planning Before Reconstruction of Old Pelvic Injuries： Initial Results

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Chinese Medical Journal 2015年第4期128卷 477-482页

作者： Xin-Bao Wu jun-qiang wang Chun-Peng Zhao Xu Sun Yin Shi Zi-An Zhang Yu-Neng Li Man-Yi wang Department of Orthopaedic Trauma Beijing Jishuitan Hospital Beijing 100035 China Laboratory of Bone Tissue Engineering Beijing Research Institute of Traumatology and Orthopaedics Beijing 100035 China

Background：Old pelvis fractures are among the most challenging fractures to treat because of their complex anatomy,difficult-to-access surgical sites,and the relatively low incidence of such *** evaluation and surgical planning are necessary to achieve the pelvic ring symmetry and stable fixation of the *** goal of this study was to assess the use of three-dimensional （3D） printing techniques for surgical management of old pelvic ***：First,16 dried human cadaveric pelvises were used to confirm the anatomical accuracy of the 3D models printed based on radiographic ***,nine clinical cases between January 2009 and April 2013 were used to evaluate the surgical reconstruction based on the 3D printed *** pelvic injuries were all type C,and the average time from injury to reconstruction was 11 weeks （range：8-17 weeks）.The workflow consisted of.：（1） Printing patient-specific bone models based on preoperative computed tomography （CT） scans,（2） virtual fracture reduction using the printed 3D anatomic template,（3） virtual fracture fixation using Kirschner wires,and （4） preoperatively measuring the osteotomy and implant position relative to landmarks using the virtually defined *** models aided communication between surgical team members during the *** technique was validated by comparing the preoperative planning to the intraoperative ***：The accuracy of the 3D printed models was within *** of a model from standard CT DICOM data took 7 hours （range：6-9 hours）.Preoperative planning using the 3D printed models was feasible in all *** correlation was found between the preoperative planning and postoperative follow-up X-ray in all nine *** patients were followed for 3-29 months （median：5 months）.The fracture healing time was 9-17 weeks （mean：l0 weeks）.No delayed incision healing,wound infection,or nonunions *** results were excellent in two cases,good in f

关键词： Old Fracture Pelvis Preoperative Planning Surgery Three-dimensional Printing