Aimed at the disadvantages of secondary damage to oil layers caused by the conventional bull-heading water control technique, a thermo-sensitive temporary plugging agent for water control was synthesized by water solu...Aimed at the disadvantages of secondary damage to oil layers caused by the conventional bull-heading water control technique, a thermo-sensitive temporary plugging agent for water control was synthesized by water solution polymerization and applied in the field with a new secondary temporary plugging technique. The optimization and performance evaluation of thermo-sensitive temporary plugging agent were carried out through laboratory experiments. The optimized formula is as follows:(6%-8%) acrylamide +(0.08%-0.12%) ammonium persulfate +(1.5%-2.0%) sepiolite +(0.5%-0.8%) polyethylene glycol diacrylate. The thermo-sensitive temporary plugging agent is suitable for formation temperatures of 70-90 ?C, it has high temporary plugging strength(5-40 k Pa), controllable degradation time(1-15 d), the apparent viscosity after degradation of less than 100 m Pa?S and the permeability recovery value of simulated cores of more than 95%. Based on the research results, secondary temporary plugging technique was used in a horizontal well in the Jidong Oilfield. After treatment, the well saw a drop of water cut to 27%, and now it has a water cut of 67%, its daily increased oil production was 4.8 t, and the cumulative oil increment was 750 t, demonstrating that the technique worked well in controlling water production and increasing oil production.展开更多
Aim: The simultaneous irradiation of target volumes of different total dose levels using intensity modulated radiotherapy leads to reduced doses per fraction and longer treatment times in target volumes of 2nd?to 4th?...Aim: The simultaneous irradiation of target volumes of different total dose levels using intensity modulated radiotherapy leads to reduced doses per fraction and longer treatment times in target volumes of 2nd?to 4th?order. Does the thereby caused reduced biological effectiveness induce an increased recurrence risk? The current work deals with the problem of recurrences of patients with head and neck carcinomas treated either with an intensitiy (IMRT) or with a volumetric modulated (VMAT) irradiation technique. Methods: From October 2002 to September 2014, 699 patients with carcinomas of the head and neck were irradiated using IMRT or VMAT. The median follow up of the patients was 21.9 months (2 to 145 months). Primary tumor regions (1st?order target volume) of 565 patients were treated with doses per fraction of 2 Gy. Accordingly, further 133 target volumes of the primary tumor received reduced doses per fraction. In 1 patient, the lymphatic drainage was treated solely without irradiation of the primary region. For the lympatic drainage, 854 1st?order target volumes were treated with a dose per fraction of 2 Gy. Reduced doses per fraction were applied to further 1780 target volumes. Results: 54 of 699 patients developed a recurrence in the primary tumor region after radio-(chemo) therapy, 4 patients developed a recurrence of the primary tumor and a unilateral recurrence of the lymphatic drainage, 2 patients a recurrence of the primary tumor and a bilateral lymph node recurrence. 18 patients showed an isolated unilateral recurrence and additionally 2 patients a bilateral recurrence of the lymphatic drainage. 619 patients stayed recurrence free. In primary tumor regions, receiving a dose per fraction of 2 Gy 55 patients (9.7%) developed a recurrence, whereas in target volumes receiving a reduced dose per fraction 5 patients (3.8%) developed a recurrence (p < 0.001). In lympatic drainage target volumes receiving a dose per fraction of 2 Gy, 25 target volumes (2.9%) developed a recurrence, whereas in target volumes receiving a reduced dose per fraction, 5 patients (0.3%) developed a recurrence (p = 0.001). Conclusion: The recurrence risk in target volumes of 2nd?to 4th?order was not increased due to reduced doses per fraction deposited by means of a simultaneous integrated boost technique. Therefore, the simultaneous irradiation of target volumes with different dose levels is safely applicable within one treatment plan.展开更多
Although the number of hospitalizations for non-variceal gastrointestinal bleeding has decreased inrecent years,acute upper gastrointestinalhemorrhage continues to be a common reason forhospital admission,and peptic u...Although the number of hospitalizations for non-variceal gastrointestinal bleeding has decreased inrecent years,acute upper gastrointestinalhemorrhage continues to be a common reason forhospital admission,and peptic ulcers account for atleast fifty percent of all cases.Despite the fact thatbleeding from ulcers ceases spontaneously inapproximately 80% of patients,it is still a展开更多
AIM: To investigate the combined antegraderetrograde endoscopic rendezvous technique for complete oesophageal obstruction and the swallowing outcome.METHODS: This single-centre case series includes consecutive patient...AIM: To investigate the combined antegraderetrograde endoscopic rendezvous technique for complete oesophageal obstruction and the swallowing outcome.METHODS: This single-centre case series includes consecutive patients who were unable to swallow due to complete oesophageal obstruction and underwent combined antegrade-retrograde endoscopic dilation(CARD) within the last 10 years. The patients' demographic characteristics, clinical parameters, endoscopic therapy, adverse events, and outcomes were obtained retrospectively. Technical success was defined as effective restoration of oesophageal patency. Swallowing success was defined as either percutaneous endoscopic gastrostomy(PEG)-tube independency and/or relevant improvement of oral food intake, as assessed by the functional oral intake scale(FOIS)(≥ level 3).RESULTS: The cohort consisted of six patients [five males; mean age 71 years(range, 54-74)]. All but one patient had undergone radiotherapy for head and neck or oesophageal cancer. Technical success was achieved in five out of six patients. After discharge, repeated dilations were performed in all five patients. During follow-up(median 27 mo, range, 2-115), three patients remained PEG-tube dependent. Three of four patients achieved relevant improvement of swallowing(two patients: FOIS 6, one patient: FOIS 7). One patient developed mediastinal emphysema following CARD, without a need for surgery.CONCLUSION: The CARD technique is safe and a viable alternative to high-risk blind antegrade dilation in patients with complete proximal oesophageal obstruction. Although only half of the patients remained PEG-tube independent, the majority improved their ability to swallow.展开更多
BACKGROUND Implant fracture is one of the most serious mechanical complications of dental implants.Conventional treatment necessitates visibility of the apical portion of the fractured implant,whereas for deep and inv...BACKGROUND Implant fracture is one of the most serious mechanical complications of dental implants.Conventional treatment necessitates visibility of the apical portion of the fractured implant,whereas for deep and invisible implant fractures,the traditional trephine method has been ineffective.Surgical removal of the marginal bone to expose the fracture surface would be a time-consuming and extensively damaging procedure.Here,we propose a novel technique to address invisible implant fractures.CASE SUMMARY A 50-year-old woman was referred to our department with the chief complaint that her right mandibular implant tooth had fallen out 3 mo earlier.Cone-beam computed tomography examination showed an implant fracture with a fracture surface 5.1 mm below the crestal ridge.The patient was treated with osteotomy combined with the trephine technique to expose the surgical field and remove the implant.The invisible fractured implant was successfully removed,with minimal trauma.A modified Wafer technique-supported guided bone regeneration treatment was then administered to restore the buccal bone wall and preserve the bone mass.Six months later,fine regenerative bone and a wide alveolar crest in the edentulous area were observed,and a new implant was placed.Four months later,restoration was completed using a cemented ceramic prosthesis.Clinical and radiographic examinations 12 mo after loading fulfilled the success criteria.The patient reported no complaints and was satisfied.CONCLUSION Osteotomy combined with the trephine technique can be effectively used to address deep and invisible implant fractures.展开更多
Infiltration and localization of preferential infiltration zones at the dam abutment are measured using radioactive tracer tests of flow in boreholes, meanwhile interconnection between boreholes and the energing water...Infiltration and localization of preferential infiltration zones at the dam abutment are measured using radioactive tracer tests of flow in boreholes, meanwhile interconnection between boreholes and the energing water points is analysed. The theory and practice of radioactive tracer synthetic detective method are described to give methods and calculation formulae used under the condition of stable flow in single well to measure permeability coefficient and hydrostatic heads. Major single hole techniques including measurement for seepage line, velocity, rate of seepage flow and relationship of recharge of groundwater in aquifers are introduced briefly.The possibilities offered by natural tracers are analysed, including electric-conduct,pH-value and temperature of water as well as stable isotopes (D, 18O) and tritium.Furthermore, the sensibilities of this theory and methods were confirmed by detecting seepage flow field of Xinanjiang Dam.展开更多
Sensor nodes are mainly shielded in the field with limited power supply. In Wireless Sensor Networks, there must be a requirement of an efficient power management, because sensor nodes are deployed in unman attended a...Sensor nodes are mainly shielded in the field with limited power supply. In Wireless Sensor Networks, there must be a requirement of an efficient power management, because sensor nodes are deployed in unman attended area with non-rechargeable batteries. Power management can be done by different methods of routing protocols. The proposed Reliable Rim Routing (3R) technique is based on hybrid routing protocol for homogeneous and heterogeneous system for WSNs to ameliorate the performance of the overall system. In 3R, total node deployment area can be multipart in terms of rim and in each rim, and some of the sensor nodes transmit their sensed data directly to base station, and meanwhile remaining sensor nodes send the data through clustering technique to base station like SEP. Proposed 3R technique implementation proves its enhanced WSNs lifetime of 70% energy consumption and 40% throughput compared with existing protocols. Simulation and evaluation results outperformed in terms of energy consumption with increased throughput and network lifetime.展开更多
目的:探讨应用Ilizarov技术在旋转中心穹顶状截骨治疗青少年股骨远端外翻畸形的疗效。方法:采用回顾性研究分析2016年1月至2020年10月收治并获得完整随访的11例股骨远端外翻畸形患者的临床资料,其中男7例,女4例;右侧6例,左侧5例;年龄10...目的:探讨应用Ilizarov技术在旋转中心穹顶状截骨治疗青少年股骨远端外翻畸形的疗效。方法:采用回顾性研究分析2016年1月至2020年10月收治并获得完整随访的11例股骨远端外翻畸形患者的临床资料,其中男7例,女4例;右侧6例,左侧5例;年龄10~14岁。在股骨远端畸形处找出成角旋转中心(center of roration of angulation,CORA),以CORA为中点,行穹顶状截骨,根据Ilizarov外固定穿针原则安装环形外固定架,截断股骨远端,即时矫正股骨远端目测下外翻畸形,外固定架固定维持。术后根据双下肢负重全长正侧位X线片提示的下肢力线及长度结果,矫正残余畸形及短缩。结果:11例均得到随访,时间13~25个月,带架时间12~17周。末次随访拍摄双下肢负重全长正侧位X线片测量11例双下肢长度均等长,畸形均矫正。采用美国特种外科医院(Hospital Special Surgery,HSS)评分评价膝关节功能,均为优。结论:应用Ilizarov技术在旋转中心穹顶状截骨治疗青少年股骨远端外翻畸形,术中即时矫正目测下股骨外翻畸形,术后根据双下肢负重正侧位片提示的下肢力线及短缩程度,动态调整矫正残余畸形及短缩,损伤小,恢复快。展开更多
目的分析膝关节微创技术及截骨术在膝关节骨病保膝治疗中的临床效果。方法回顾性选取龙岩人民医院于2020年9月—2023年12月收治的100例膝关节骨病患者的临床资料,根据治疗方案不同将其分为两组,每组50例。对照组实施传统膝关节置换术治...目的分析膝关节微创技术及截骨术在膝关节骨病保膝治疗中的临床效果。方法回顾性选取龙岩人民医院于2020年9月—2023年12月收治的100例膝关节骨病患者的临床资料,根据治疗方案不同将其分为两组,每组50例。对照组实施传统膝关节置换术治疗,研究组实施膝关节微创技术及截骨术治疗,比较两组的治疗效果。结果研究组治疗总有效率为98.00%,高于对照组的84.00%,差异有统计学意义(χ^(2)=4.369,P=0.036);研究组治疗后膝关节功能评定量表(Harris Hip Score,HSS)评分高于对照组,且视觉模拟评分(Visual Analog Scale,VAS)评分低于对照组,差异有统计学意义(P均<0.05);研究组手术耗时、术后下地时间、愈合时间均短于对照组,且术中失血量少于对照组,差异有统计学意义(P均<0.05);研究组并发症总发生率为4.00%,低于对照组的16.00%,差异有统计学意义(χ^(2)=4.000,P=0.046)。结论膝关节微创技术及截骨术治疗膝关节骨病的疗效确切,相比传统方法,能提高治疗有效率,促进患者的术后恢复,降低疼痛和并发症的发生率。展开更多
基金Supported by the National Key Special Science and Technology Project(2016ZX05015-002)PetroChina Key Special Science and Technology Project(2016E-0104)
文摘Aimed at the disadvantages of secondary damage to oil layers caused by the conventional bull-heading water control technique, a thermo-sensitive temporary plugging agent for water control was synthesized by water solution polymerization and applied in the field with a new secondary temporary plugging technique. The optimization and performance evaluation of thermo-sensitive temporary plugging agent were carried out through laboratory experiments. The optimized formula is as follows:(6%-8%) acrylamide +(0.08%-0.12%) ammonium persulfate +(1.5%-2.0%) sepiolite +(0.5%-0.8%) polyethylene glycol diacrylate. The thermo-sensitive temporary plugging agent is suitable for formation temperatures of 70-90 ?C, it has high temporary plugging strength(5-40 k Pa), controllable degradation time(1-15 d), the apparent viscosity after degradation of less than 100 m Pa?S and the permeability recovery value of simulated cores of more than 95%. Based on the research results, secondary temporary plugging technique was used in a horizontal well in the Jidong Oilfield. After treatment, the well saw a drop of water cut to 27%, and now it has a water cut of 67%, its daily increased oil production was 4.8 t, and the cumulative oil increment was 750 t, demonstrating that the technique worked well in controlling water production and increasing oil production.
文摘Aim: The simultaneous irradiation of target volumes of different total dose levels using intensity modulated radiotherapy leads to reduced doses per fraction and longer treatment times in target volumes of 2nd?to 4th?order. Does the thereby caused reduced biological effectiveness induce an increased recurrence risk? The current work deals with the problem of recurrences of patients with head and neck carcinomas treated either with an intensitiy (IMRT) or with a volumetric modulated (VMAT) irradiation technique. Methods: From October 2002 to September 2014, 699 patients with carcinomas of the head and neck were irradiated using IMRT or VMAT. The median follow up of the patients was 21.9 months (2 to 145 months). Primary tumor regions (1st?order target volume) of 565 patients were treated with doses per fraction of 2 Gy. Accordingly, further 133 target volumes of the primary tumor received reduced doses per fraction. In 1 patient, the lymphatic drainage was treated solely without irradiation of the primary region. For the lympatic drainage, 854 1st?order target volumes were treated with a dose per fraction of 2 Gy. Reduced doses per fraction were applied to further 1780 target volumes. Results: 54 of 699 patients developed a recurrence in the primary tumor region after radio-(chemo) therapy, 4 patients developed a recurrence of the primary tumor and a unilateral recurrence of the lymphatic drainage, 2 patients a recurrence of the primary tumor and a bilateral lymph node recurrence. 18 patients showed an isolated unilateral recurrence and additionally 2 patients a bilateral recurrence of the lymphatic drainage. 619 patients stayed recurrence free. In primary tumor regions, receiving a dose per fraction of 2 Gy 55 patients (9.7%) developed a recurrence, whereas in target volumes receiving a reduced dose per fraction 5 patients (3.8%) developed a recurrence (p < 0.001). In lympatic drainage target volumes receiving a dose per fraction of 2 Gy, 25 target volumes (2.9%) developed a recurrence, whereas in target volumes receiving a reduced dose per fraction, 5 patients (0.3%) developed a recurrence (p = 0.001). Conclusion: The recurrence risk in target volumes of 2nd?to 4th?order was not increased due to reduced doses per fraction deposited by means of a simultaneous integrated boost technique. Therefore, the simultaneous irradiation of target volumes with different dose levels is safely applicable within one treatment plan.
文摘Although the number of hospitalizations for non-variceal gastrointestinal bleeding has decreased inrecent years,acute upper gastrointestinalhemorrhage continues to be a common reason forhospital admission,and peptic ulcers account for atleast fifty percent of all cases.Despite the fact thatbleeding from ulcers ceases spontaneously inapproximately 80% of patients,it is still a
文摘AIM: To investigate the combined antegraderetrograde endoscopic rendezvous technique for complete oesophageal obstruction and the swallowing outcome.METHODS: This single-centre case series includes consecutive patients who were unable to swallow due to complete oesophageal obstruction and underwent combined antegrade-retrograde endoscopic dilation(CARD) within the last 10 years. The patients' demographic characteristics, clinical parameters, endoscopic therapy, adverse events, and outcomes were obtained retrospectively. Technical success was defined as effective restoration of oesophageal patency. Swallowing success was defined as either percutaneous endoscopic gastrostomy(PEG)-tube independency and/or relevant improvement of oral food intake, as assessed by the functional oral intake scale(FOIS)(≥ level 3).RESULTS: The cohort consisted of six patients [five males; mean age 71 years(range, 54-74)]. All but one patient had undergone radiotherapy for head and neck or oesophageal cancer. Technical success was achieved in five out of six patients. After discharge, repeated dilations were performed in all five patients. During follow-up(median 27 mo, range, 2-115), three patients remained PEG-tube dependent. Three of four patients achieved relevant improvement of swallowing(two patients: FOIS 6, one patient: FOIS 7). One patient developed mediastinal emphysema following CARD, without a need for surgery.CONCLUSION: The CARD technique is safe and a viable alternative to high-risk blind antegrade dilation in patients with complete proximal oesophageal obstruction. Although only half of the patients remained PEG-tube independent, the majority improved their ability to swallow.
文摘BACKGROUND Implant fracture is one of the most serious mechanical complications of dental implants.Conventional treatment necessitates visibility of the apical portion of the fractured implant,whereas for deep and invisible implant fractures,the traditional trephine method has been ineffective.Surgical removal of the marginal bone to expose the fracture surface would be a time-consuming and extensively damaging procedure.Here,we propose a novel technique to address invisible implant fractures.CASE SUMMARY A 50-year-old woman was referred to our department with the chief complaint that her right mandibular implant tooth had fallen out 3 mo earlier.Cone-beam computed tomography examination showed an implant fracture with a fracture surface 5.1 mm below the crestal ridge.The patient was treated with osteotomy combined with the trephine technique to expose the surgical field and remove the implant.The invisible fractured implant was successfully removed,with minimal trauma.A modified Wafer technique-supported guided bone regeneration treatment was then administered to restore the buccal bone wall and preserve the bone mass.Six months later,fine regenerative bone and a wide alveolar crest in the edentulous area were observed,and a new implant was placed.Four months later,restoration was completed using a cemented ceramic prosthesis.Clinical and radiographic examinations 12 mo after loading fulfilled the success criteria.The patient reported no complaints and was satisfied.CONCLUSION Osteotomy combined with the trephine technique can be effectively used to address deep and invisible implant fractures.
文摘Infiltration and localization of preferential infiltration zones at the dam abutment are measured using radioactive tracer tests of flow in boreholes, meanwhile interconnection between boreholes and the energing water points is analysed. The theory and practice of radioactive tracer synthetic detective method are described to give methods and calculation formulae used under the condition of stable flow in single well to measure permeability coefficient and hydrostatic heads. Major single hole techniques including measurement for seepage line, velocity, rate of seepage flow and relationship of recharge of groundwater in aquifers are introduced briefly.The possibilities offered by natural tracers are analysed, including electric-conduct,pH-value and temperature of water as well as stable isotopes (D, 18O) and tritium.Furthermore, the sensibilities of this theory and methods were confirmed by detecting seepage flow field of Xinanjiang Dam.
文摘Sensor nodes are mainly shielded in the field with limited power supply. In Wireless Sensor Networks, there must be a requirement of an efficient power management, because sensor nodes are deployed in unman attended area with non-rechargeable batteries. Power management can be done by different methods of routing protocols. The proposed Reliable Rim Routing (3R) technique is based on hybrid routing protocol for homogeneous and heterogeneous system for WSNs to ameliorate the performance of the overall system. In 3R, total node deployment area can be multipart in terms of rim and in each rim, and some of the sensor nodes transmit their sensed data directly to base station, and meanwhile remaining sensor nodes send the data through clustering technique to base station like SEP. Proposed 3R technique implementation proves its enhanced WSNs lifetime of 70% energy consumption and 40% throughput compared with existing protocols. Simulation and evaluation results outperformed in terms of energy consumption with increased throughput and network lifetime.
文摘目的:探讨应用Ilizarov技术在旋转中心穹顶状截骨治疗青少年股骨远端外翻畸形的疗效。方法:采用回顾性研究分析2016年1月至2020年10月收治并获得完整随访的11例股骨远端外翻畸形患者的临床资料,其中男7例,女4例;右侧6例,左侧5例;年龄10~14岁。在股骨远端畸形处找出成角旋转中心(center of roration of angulation,CORA),以CORA为中点,行穹顶状截骨,根据Ilizarov外固定穿针原则安装环形外固定架,截断股骨远端,即时矫正股骨远端目测下外翻畸形,外固定架固定维持。术后根据双下肢负重全长正侧位X线片提示的下肢力线及长度结果,矫正残余畸形及短缩。结果:11例均得到随访,时间13~25个月,带架时间12~17周。末次随访拍摄双下肢负重全长正侧位X线片测量11例双下肢长度均等长,畸形均矫正。采用美国特种外科医院(Hospital Special Surgery,HSS)评分评价膝关节功能,均为优。结论:应用Ilizarov技术在旋转中心穹顶状截骨治疗青少年股骨远端外翻畸形,术中即时矫正目测下股骨外翻畸形,术后根据双下肢负重正侧位片提示的下肢力线及短缩程度,动态调整矫正残余畸形及短缩,损伤小,恢复快。
文摘目的分析膝关节微创技术及截骨术在膝关节骨病保膝治疗中的临床效果。方法回顾性选取龙岩人民医院于2020年9月—2023年12月收治的100例膝关节骨病患者的临床资料,根据治疗方案不同将其分为两组,每组50例。对照组实施传统膝关节置换术治疗,研究组实施膝关节微创技术及截骨术治疗,比较两组的治疗效果。结果研究组治疗总有效率为98.00%,高于对照组的84.00%,差异有统计学意义(χ^(2)=4.369,P=0.036);研究组治疗后膝关节功能评定量表(Harris Hip Score,HSS)评分高于对照组,且视觉模拟评分(Visual Analog Scale,VAS)评分低于对照组,差异有统计学意义(P均<0.05);研究组手术耗时、术后下地时间、愈合时间均短于对照组,且术中失血量少于对照组,差异有统计学意义(P均<0.05);研究组并发症总发生率为4.00%,低于对照组的16.00%,差异有统计学意义(χ^(2)=4.000,P=0.046)。结论膝关节微创技术及截骨术治疗膝关节骨病的疗效确切,相比传统方法,能提高治疗有效率,促进患者的术后恢复,降低疼痛和并发症的发生率。
