Natural orifice transluminal endoscopic surgery(NOTES)associated with less pain,shorter hospital stay,and outstanding cosmetic results has drawn considerable attention from the academic community.For NOTES,pneumoperit...Natural orifice transluminal endoscopic surgery(NOTES)associated with less pain,shorter hospital stay,and outstanding cosmetic results has drawn considerable attention from the academic community.For NOTES,pneumoperitoneum is an essential technology to obtain intraperitoneal surgical space,which,however,can have some serious adverse hemodynamic effects.In this paper,we propose a novel intra-abdominal wall-lifting device that can replace the pneumoperitoneum functionally for transvaginal NOTES(vNOTES).The device consists mainly of two layers of elastic strips,namely,the outer strips that are used to lift the abdominal wall for surgical exposure and the inner strip with a camera mounted that can rotate to provide a wide surgical field of view.With the design,gasless vNOTES can be carried out with 82.74% of the operative field provided by pneumoperitoneum,eliminating all complications associated with gas insufflation.The design principle and kinematic analysis of the device are discussed in detail and validated by experiments.Finally,a prototype is fabricated to demonstrate the feasibility of the proposed concept.展开更多
Along with the consumption increase of the petroleum products, more countries have transferred their attentions to the offshore fields, especially the deepwater oil and gas reserves. For deepwater exploitation, the ri...Along with the consumption increase of the petroleum products, more countries have transferred their attentions to the offshore fields, especially the deepwater oil and gas reserves. For deepwater exploitation, the risers must be installed to act as the conduits connecting surface platforms to subsea facilities. In this paper, the typical risers sorted by different classes are introduced, and the correspondent installation methods are presented. By investigating the recent projects performed in the deepwater hot spots, and combining the challenges of HYSY20 l for riser installation, a lifting device developed for assisting riser installation is proposed and detailed to satisfy the installation of deepwater risers in the LW3-1 Gas Field of 1500 m in the South China Sea. Tests on both the functions and performances of such a new system exhibit the satisfaction of meeting all challenging requirements of HYSY201 for application to riser installation in waters up to a depth of 3000 m in the South China Sea.展开更多
Using CiteSpace visualization software,literature research on roof parking lot in recent 20 years is analyzed,and the research direction and development of the relevant papers are integrated and induced.From utilizati...Using CiteSpace visualization software,literature research on roof parking lot in recent 20 years is analyzed,and the research direction and development of the relevant papers are integrated and induced.From utilization development,roof greening and technical practice,overall consideration and grasp of the feasibility of roof parking lot are conducted.Realization paths of two kinds of roof parking lots are provided:suspended PRT stereo parking lot and telescopic rail elevator,and it is committed to providing feasible suggestions and reference for future roof parking lot.展开更多
文摘Natural orifice transluminal endoscopic surgery(NOTES)associated with less pain,shorter hospital stay,and outstanding cosmetic results has drawn considerable attention from the academic community.For NOTES,pneumoperitoneum is an essential technology to obtain intraperitoneal surgical space,which,however,can have some serious adverse hemodynamic effects.In this paper,we propose a novel intra-abdominal wall-lifting device that can replace the pneumoperitoneum functionally for transvaginal NOTES(vNOTES).The device consists mainly of two layers of elastic strips,namely,the outer strips that are used to lift the abdominal wall for surgical exposure and the inner strip with a camera mounted that can rotate to provide a wide surgical field of view.With the design,gasless vNOTES can be carried out with 82.74% of the operative field provided by pneumoperitoneum,eliminating all complications associated with gas insufflation.The design principle and kinematic analysis of the device are discussed in detail and validated by experiments.Finally,a prototype is fabricated to demonstrate the feasibility of the proposed concept.
基金supported by the National Natural Science Foundation of China(Grant No. 50979113)the High Technology Research and Development Program of China(863 Program,Grant No. 2006AA09A105)
文摘Along with the consumption increase of the petroleum products, more countries have transferred their attentions to the offshore fields, especially the deepwater oil and gas reserves. For deepwater exploitation, the risers must be installed to act as the conduits connecting surface platforms to subsea facilities. In this paper, the typical risers sorted by different classes are introduced, and the correspondent installation methods are presented. By investigating the recent projects performed in the deepwater hot spots, and combining the challenges of HYSY20 l for riser installation, a lifting device developed for assisting riser installation is proposed and detailed to satisfy the installation of deepwater risers in the LW3-1 Gas Field of 1500 m in the South China Sea. Tests on both the functions and performances of such a new system exhibit the satisfaction of meeting all challenging requirements of HYSY201 for application to riser installation in waters up to a depth of 3000 m in the South China Sea.
文摘Using CiteSpace visualization software,literature research on roof parking lot in recent 20 years is analyzed,and the research direction and development of the relevant papers are integrated and induced.From utilization development,roof greening and technical practice,overall consideration and grasp of the feasibility of roof parking lot are conducted.Realization paths of two kinds of roof parking lots are provided:suspended PRT stereo parking lot and telescopic rail elevator,and it is committed to providing feasible suggestions and reference for future roof parking lot.
