Hard coal is an important source of energy worldwide.Owing to the imperfections of excavation technology,most run-of-mine coals must be processed before they can be utilised as fuel.In this study,tests on the dry sepa...Hard coal is an important source of energy worldwide.Owing to the imperfections of excavation technology,most run-of-mine coals must be processed before they can be utilised as fuel.In this study,tests on the dry separation process were performed with numerous different raw hard coal and coal waste material samples,using a newly designed and constructed negative-pressure pneumatic separator(NPPS).The experiments revealed the effects of the feed-material properties and material processing conditions.These experiments were preceded by additional tests for evaluating the influence of each device operating parameter on the process,to determine the optimal method of supplying the feed material.The calorific value of the processed materials was improved by 5%–40%,while a minimal output yield of products(60%–70%)was maintained.The trials indicated that in coal material processing,the developed NPPS can be used for not only raw coal enrichment but also coal recovery from materials stored at coal-waste dumps.The main advantages of the device are its mobility,low material processing cost,and lack of water consumption during operation.展开更多
Negative-pressure wound therapy(NPWT) has been a successful modality of wound management which is in widespread use in several surgical fields. The main mechanisms of action thought to play a role in enhancing wound h...Negative-pressure wound therapy(NPWT) has been a successful modality of wound management which is in widespread use in several surgical fields. The main mechanisms of action thought to play a role in enhancing wound healing and preventing surgical site infection are macrodeformation and microdeformation of the wound bed, fluid removal, and stabilization of the wound environment. Due to the devastating consequences of infection in the setting of joint arthroplasty, there has been some interest in the use of NPWT following total hip arthroplasty and total knee arthroplasty. However, there is still a scarcity of data reporting on the use of NPWT within this field and most studies are limited by small sample sizes, high variability of clinical settings and end-points. There is little evidence to support the use of NPWT as an adjunctive treatment for surgical wound drainage, and for this reason surgical intervention should not be delayed when indicated. The prophylactic use of NPWT after arthroplasty in patients that are at high risk for postoperative wound drainage appears to have the strongest clinical evidence. Several clinical trialsincluding single-use NPWT devices for this purpose are currently in progress and this may soon be incorporated in clinical guidelines as a mean to prevent periprosthetic joint infections.展开更多
Objective To investigate the application of transposition flaps in the reconstruction of perianal skin defects after tumor resection.Methods From September 2018 to December 2019,16 cases of perianal skin defects were ...Objective To investigate the application of transposition flaps in the reconstruction of perianal skin defects after tumor resection.Methods From September 2018 to December 2019,16 cases of perianal skin defects were repaired with unilateral or bilateral transposition flaps.The wound size before closure ranged from 4 cm×8 cm to 7 cm×10 cm.Fourteen patients achieved primary healing.Wound dehiscence occurred in one patient at the flap tip,whereas a slight infection occurred in another patient,which healed after a dressing change.During the follow-up period of 3–6 months,all patients were satisfied with the perianal area both aesthetically and functionally.Conclusion Transposition flaps are a promising option for the repair of perianal skin defects after tumor removal.Owing to the simplicity of the flap design,the wide popularity of this flap type among surgeons is anticipated.展开更多
基金The research presented in this paper was performed as a part of the Project AMSEP“Novel dry sorter for coal processing and coal recovery from mine originating wastes”,which was conducted with a financial grant from the European Institute of Innovation and Technology in frame of InnoEnergy S.E.,with Central Mining Institute as the Project coordinator.It was also financially supported by Statutory Research No.11325018-173.
文摘Hard coal is an important source of energy worldwide.Owing to the imperfections of excavation technology,most run-of-mine coals must be processed before they can be utilised as fuel.In this study,tests on the dry separation process were performed with numerous different raw hard coal and coal waste material samples,using a newly designed and constructed negative-pressure pneumatic separator(NPPS).The experiments revealed the effects of the feed-material properties and material processing conditions.These experiments were preceded by additional tests for evaluating the influence of each device operating parameter on the process,to determine the optimal method of supplying the feed material.The calorific value of the processed materials was improved by 5%–40%,while a minimal output yield of products(60%–70%)was maintained.The trials indicated that in coal material processing,the developed NPPS can be used for not only raw coal enrichment but also coal recovery from materials stored at coal-waste dumps.The main advantages of the device are its mobility,low material processing cost,and lack of water consumption during operation.
文摘Negative-pressure wound therapy(NPWT) has been a successful modality of wound management which is in widespread use in several surgical fields. The main mechanisms of action thought to play a role in enhancing wound healing and preventing surgical site infection are macrodeformation and microdeformation of the wound bed, fluid removal, and stabilization of the wound environment. Due to the devastating consequences of infection in the setting of joint arthroplasty, there has been some interest in the use of NPWT following total hip arthroplasty and total knee arthroplasty. However, there is still a scarcity of data reporting on the use of NPWT within this field and most studies are limited by small sample sizes, high variability of clinical settings and end-points. There is little evidence to support the use of NPWT as an adjunctive treatment for surgical wound drainage, and for this reason surgical intervention should not be delayed when indicated. The prophylactic use of NPWT after arthroplasty in patients that are at high risk for postoperative wound drainage appears to have the strongest clinical evidence. Several clinical trialsincluding single-use NPWT devices for this purpose are currently in progress and this may soon be incorporated in clinical guidelines as a mean to prevent periprosthetic joint infections.
文摘Objective To investigate the application of transposition flaps in the reconstruction of perianal skin defects after tumor resection.Methods From September 2018 to December 2019,16 cases of perianal skin defects were repaired with unilateral or bilateral transposition flaps.The wound size before closure ranged from 4 cm×8 cm to 7 cm×10 cm.Fourteen patients achieved primary healing.Wound dehiscence occurred in one patient at the flap tip,whereas a slight infection occurred in another patient,which healed after a dressing change.During the follow-up period of 3–6 months,all patients were satisfied with the perianal area both aesthetically and functionally.Conclusion Transposition flaps are a promising option for the repair of perianal skin defects after tumor removal.Owing to the simplicity of the flap design,the wide popularity of this flap type among surgeons is anticipated.
