The treatment of pathologies in the thoracic spine is a challenge. The periodic failure of pedicle screw insertion and anatomical variations make the search for an alternative to pedicle screws in thoracic spine surge...The treatment of pathologies in the thoracic spine is a challenge. The periodic failure of pedicle screw insertion and anatomical variations make the search for an alternative to pedicle screws in thoracic spine surgery necessary. The interlaminar crossed screws is a well-known and secure method for fusion in cervical spine, and in thoracic spine there used to be insufficient clinical data to support this technique, until now. We demonstrate in an initial series of 10 cases treated with interlaminar fusion in association of other fusion techniques in the thoracic spine with good results. Objective: Intralaminar screws have been shown to be a biomechanical salvage technique in the thoracic spine, especially in long cervicothoracic, thoracic and thoracolumbar fixation. The goals of this article are to demonstrate our initial experience and the range of indications for thoracic crossed intralaminar screws. Methods: In this article we describe our initial series performed at São Teotónio Hospital in Viseu, Portugal, and our results, and also provide a comprehensive review of the recent literature in the use of intralaminar crossed fixation.展开更多
The control of micro-wettability of pore-throat on shale oil occurrence in different types of reservoir spaces remains unclear.Take the shale oil reservoir of the Permian Lucaogou Formation in the Jimusar Sag,Junggar ...The control of micro-wettability of pore-throat on shale oil occurrence in different types of reservoir spaces remains unclear.Take the shale oil reservoir of the Permian Lucaogou Formation in the Jimusar Sag,Junggar Basin as an example,the reservoir space in laminated shale and the control of micro-wettability of pore-throat on shale oil occurrence were studied by using scanning electron microscope(SEM),multi-stage pyrolysis,quantitative fluorescence,nuclear magnetic resonance(NMR)and other techniques.The results show that there are mainly two types of laminated shale in the Lucaogou Formation,namely laminated shale rich in volcanic materials+terrigenous felsic,and laminated shale rich in volcanic materials+carbonate.The former type contains feldspar dissolution pores and intergranular pores,mainly with felsic mineral components around the pore-throats,which are water-wet and control the free shale oil.The latter type contains carbonate intercrystalline pores and organic pores,mainly with oil-wet mineral components around the pore-throats,which control the adsorbed shale oil.The oil-wet mineral components around the pore-throats are conducive to oil accumulation,but reduce the proportion of free oil.In the Lucaogou Formation,free oil,with high maturity and light quality,mainly occurs in the laminated shale rich in volcanic materials+terrigenous felsic.展开更多
目的探讨皮肤至椎板距离(skr-to-laminal distme,SLD)和皮下脂肪厚度对微创腰椎减压术后的影响。方法选择2021年1月至2023年6月在该院接受微创腰椎减压术的173例患者作为研究对象,收集患者SLD距离和皮下脂肪厚度数据,分别根据中位值分...目的探讨皮肤至椎板距离(skr-to-laminal distme,SLD)和皮下脂肪厚度对微创腰椎减压术后的影响。方法选择2021年1月至2023年6月在该院接受微创腰椎减压术的173例患者作为研究对象,收集患者SLD距离和皮下脂肪厚度数据,分别根据中位值分为低值组和高值组,观察两组患者术前、住院及出院资料差异。结果高SLD距离患者与低SLD距离患者的体质量指数(body mass index,BMI)、肥胖、年龄、ASA分级、高血压、糖尿病、饮酒等比较,差异存在统计学意义(P<0.05);两组患者性别、心脏病、脑血管疾病、慢性肾脏病、吸烟、手术类型、相邻节段病变、住院时间、即时并发症、住院并发症、出院并发症、总并发症、术前ODI、术后1年ODI、术前腰痛VAS、术后1年腰痛VAS、术前腿痛VAS、术后1年腿痛VAS比较,差异均无统计学意义(P>0.05)。高皮下脂肪厚度患者和低皮下脂肪厚度患者的BMI、肥胖、年龄、ASA分级、高血压、糖尿病、饮酒比较,差异存在统计学意义(P<0.05);两组患者性别、心脏病、脑血管疾病、慢性肾脏病、吸烟、手术类型、相邻节段病变、住院时间、即时并发症、住院并发症、出院并发症、总并发症、术前ODI、术后1年ODI、术前腰痛VAS、术后1年腰痛VAS、术前腿痛VAS和术后1年腿痛VAS比较,差异均无统计学意义(P>0.05)。Pearson相关性分析显示,SLD距离和皮下脂肪厚度与BMI均存在显著相关性(r=0.703、0.712,P<0.05)。结论手术部位局部软组织厚度对腰椎微创减压术的临床结果无显著影响。展开更多
The influence of supercooled melt forced lamina flow on microsegregation was investigated. The concentration distribution at solid-liquid boundary of binary alloy Ni-Cu was simulated using phase field model coupled wi...The influence of supercooled melt forced lamina flow on microsegregation was investigated. The concentration distribution at solid-liquid boundary of binary alloy Ni-Cu was simulated using phase field model coupled with flow field. The microsegregation, concentration maximum value, boundary thickness of concentration near upstream dendrite and normal to flow dendrite, and downstream dendrite were studied quantitatively in the case of forced lamia flow. The simulation results show that solute field and flow field interact complexly. Compared with melt without flow, in front of upstream dendrite tip, the concentration boundary thickness is the lowest and the concentration maximum value is the smallest for melt with flow. However, in front of downstream dendrite tip, the results are just the opposite. The zone of poor Cu in upstream dendrite where is the most severely microsegregation and shrinkage cavity is wider and the concentration is lower for melt with flow than that without flow.展开更多
文摘The treatment of pathologies in the thoracic spine is a challenge. The periodic failure of pedicle screw insertion and anatomical variations make the search for an alternative to pedicle screws in thoracic spine surgery necessary. The interlaminar crossed screws is a well-known and secure method for fusion in cervical spine, and in thoracic spine there used to be insufficient clinical data to support this technique, until now. We demonstrate in an initial series of 10 cases treated with interlaminar fusion in association of other fusion techniques in the thoracic spine with good results. Objective: Intralaminar screws have been shown to be a biomechanical salvage technique in the thoracic spine, especially in long cervicothoracic, thoracic and thoracolumbar fixation. The goals of this article are to demonstrate our initial experience and the range of indications for thoracic crossed intralaminar screws. Methods: In this article we describe our initial series performed at São Teotónio Hospital in Viseu, Portugal, and our results, and also provide a comprehensive review of the recent literature in the use of intralaminar crossed fixation.
基金Supported by the National Natural Scienceof China(42072161,41821002)Central University Basic Research Project(22CX07008A)。
文摘The control of micro-wettability of pore-throat on shale oil occurrence in different types of reservoir spaces remains unclear.Take the shale oil reservoir of the Permian Lucaogou Formation in the Jimusar Sag,Junggar Basin as an example,the reservoir space in laminated shale and the control of micro-wettability of pore-throat on shale oil occurrence were studied by using scanning electron microscope(SEM),multi-stage pyrolysis,quantitative fluorescence,nuclear magnetic resonance(NMR)and other techniques.The results show that there are mainly two types of laminated shale in the Lucaogou Formation,namely laminated shale rich in volcanic materials+terrigenous felsic,and laminated shale rich in volcanic materials+carbonate.The former type contains feldspar dissolution pores and intergranular pores,mainly with felsic mineral components around the pore-throats,which are water-wet and control the free shale oil.The latter type contains carbonate intercrystalline pores and organic pores,mainly with oil-wet mineral components around the pore-throats,which control the adsorbed shale oil.The oil-wet mineral components around the pore-throats are conducive to oil accumulation,but reduce the proportion of free oil.In the Lucaogou Formation,free oil,with high maturity and light quality,mainly occurs in the laminated shale rich in volcanic materials+terrigenous felsic.
文摘目的探讨皮肤至椎板距离(skr-to-laminal distme,SLD)和皮下脂肪厚度对微创腰椎减压术后的影响。方法选择2021年1月至2023年6月在该院接受微创腰椎减压术的173例患者作为研究对象,收集患者SLD距离和皮下脂肪厚度数据,分别根据中位值分为低值组和高值组,观察两组患者术前、住院及出院资料差异。结果高SLD距离患者与低SLD距离患者的体质量指数(body mass index,BMI)、肥胖、年龄、ASA分级、高血压、糖尿病、饮酒等比较,差异存在统计学意义(P<0.05);两组患者性别、心脏病、脑血管疾病、慢性肾脏病、吸烟、手术类型、相邻节段病变、住院时间、即时并发症、住院并发症、出院并发症、总并发症、术前ODI、术后1年ODI、术前腰痛VAS、术后1年腰痛VAS、术前腿痛VAS、术后1年腿痛VAS比较,差异均无统计学意义(P>0.05)。高皮下脂肪厚度患者和低皮下脂肪厚度患者的BMI、肥胖、年龄、ASA分级、高血压、糖尿病、饮酒比较,差异存在统计学意义(P<0.05);两组患者性别、心脏病、脑血管疾病、慢性肾脏病、吸烟、手术类型、相邻节段病变、住院时间、即时并发症、住院并发症、出院并发症、总并发症、术前ODI、术后1年ODI、术前腰痛VAS、术后1年腰痛VAS、术前腿痛VAS和术后1年腿痛VAS比较,差异均无统计学意义(P>0.05)。Pearson相关性分析显示,SLD距离和皮下脂肪厚度与BMI均存在显著相关性(r=0.703、0.712,P<0.05)。结论手术部位局部软组织厚度对腰椎微创减压术的临床结果无显著影响。
基金Project (10964004) supported by the National Natural Science Foundation of ChinaProject (20070731001) supported by Research Fund for the Doctoral Program of ChinaProject (096RJZA104) supported by the Natural Science Foundation of Gansu Province,China
文摘The influence of supercooled melt forced lamina flow on microsegregation was investigated. The concentration distribution at solid-liquid boundary of binary alloy Ni-Cu was simulated using phase field model coupled with flow field. The microsegregation, concentration maximum value, boundary thickness of concentration near upstream dendrite and normal to flow dendrite, and downstream dendrite were studied quantitatively in the case of forced lamia flow. The simulation results show that solute field and flow field interact complexly. Compared with melt without flow, in front of upstream dendrite tip, the concentration boundary thickness is the lowest and the concentration maximum value is the smallest for melt with flow. However, in front of downstream dendrite tip, the results are just the opposite. The zone of poor Cu in upstream dendrite where is the most severely microsegregation and shrinkage cavity is wider and the concentration is lower for melt with flow than that without flow.
