不同机车组合对大秦线2.1万t列车中部机车动力学性能的影响分析

针对大秦线重载列车的2种不同机车组合(HXD2+HXD1或HXD1+HXD1),比较调速制动工况下中部机车的动力学性能,并分析不同机车组合对大秦线2.1万t列车中部机车动力学性能的影响。得出HXD1+HXD1的1+1编组中部机车的动力学性能优于HXD2+HXD1的1+1编组中部机车,信号滞后对中部机车的纵向冲动有很大影响的结论。

Ipsilateral simultaneous fracture of the trochlea involving the lateral end clavicle and distal end radius：a rare combination and a unique mechanism of injury

Isolated trochlea fracture in adults is a rare surgical entity as compared to its capitellar counterpart.It has been only mentioned sporadically in the literature as case reports.Fracture of the trochlea is accompanied by other elbow injuries like elbow dislocation,capitellum fracture,ulnar fracture and extraarticular condylar fracture.Here we report a unique case of isolated displaced trochlea fracture associated with fractures of the lateral end clavicle and the distal end radius.We propose a unique mechanism for this rare combination of injuries：typical triad of injury,i.e.fracture of the distal end radius with trochlea and fracture of the lateral end of the clavicle.Nonoperative treatment is recommended for undisplaced humeral trochlea fractures;but for displaced ones,anatomical reduction and internal fixation are essential to maintain the congruous trochleacoronoid articulation and hence to maintain the intrinsic stability of the elbow.