The influence of local landforms on ground motion is an important problem. The antiplane response of a scalene triangular hill to incident SH waves is studied in this paper by using a complex function, moving coordina...The influence of local landforms on ground motion is an important problem. The antiplane response of a scalene triangular hill to incident SH waves is studied in this paper by using a complex function, moving coordinates and auxiliary functions. First, the model is divided into two domains： a scalene triangular hill with a semi-circular bottom; and a half space with a semi-circular canyon. Wave functions that satisfy the zero-stress condition at the triangular wedges and at the horizontal surface are constructed in both domains. Then, considering the displacement continuity and stress equilibrium, algebraic equations are established. Finally, numerical examples are provided to illustrate the influence of the geometry of the hill and the characteristics of the incident waves on the ground motions.展开更多
Antiplane response of two scalene triangular hills and a semi-cylindrical canyon by SH-waves is studied using wave function expansion and complex function method. Firstly, the analytical model is divided into three pa...Antiplane response of two scalene triangular hills and a semi-cylindrical canyon by SH-waves is studied using wave function expansion and complex function method. Firstly, the analytical model is divided into three parts, and the displacement solutions of wave fields are constructed based on boundary conditions in the three regions. Three domains are then conjoined to satisfy the ＂conjunction＂ condition at shared boundary. In addition, combined with the zero-stress condition of semi-cylindrical canyon, a series of infinite algebraic equations for the problem are derived. Finally, numerical examples are provided and the influence of different parameters on ground motion is discussed.展开更多
Background:Coronary artery bypass grafting(CABG)is a coronary revascularization technique associated with diminished pulmonary function.During the first week after CABG,slow vital capacity(SVC)decreases by 30%–60%.Sc...Background:Coronary artery bypass grafting(CABG)is a coronary revascularization technique associated with diminished pulmonary function.During the first week after CABG,slow vital capacity(SVC)decreases by 30%–60%.Scalene muscles affect pulmonary function because they attach to the 1st and 2nd ribs.Shorter scalene muscles can decrease inhalation volume and chest expansion.Very few studies have assessed the effects of scalene stretching on SVC and chest expansion in patients post-CABG.Therefore,this study was aimed at determining the effects of scalene muscle stretching on SVC and chest expansion in such patients.Methods:A total of 74 patients post-CABG(phase 2)meeting the inclusion criteria were randomly allocated to two groups:an intervention group(n=30)performing scalene muscle stretching and a control group(n=30)performing active neck exercise.Pre&Post SVC and chest expansion were measured in all patients.A total of 14 patients wereexcluded.Statistical analysis was conducted in SPSS software(version 20.0).Results:SVC showed significant increase(P<0.05)in the intervention group compared with the control group.Chest expansion was statistically non-significant between groups(P>0.05).Conclusion and clinical implications:Scalene muscle stretching improves SVC in patients post-CABG(phase 2).Hence,scalene stretching should be included in programs for improving respiratory function.展开更多
Neck pain is common and has multiple sources, but correct diagnosis and matched treatment provide the best outcomes. The first description of ultrasound-guided dorsal scapular nerve blockade using a single-shot local ...Neck pain is common and has multiple sources, but correct diagnosis and matched treatment provide the best outcomes. The first description of ultrasound-guided dorsal scapular nerve blockade using a single-shot local anesthetic technique for the diagnosis and treatment of neck pain is reported. A 38-year-old female patient presented with neck pain, and the history and clinical examination strongly suggested myofascial pain affecting the middle scalene muscle. The pain had been unresponsive to pharmacological therapy or physiotherapy. After identifying the dorsal scapular nerve (DSN) in the body of the middle scalene muscle, an ultrasound-guided nerve block was performed using a single injection of local anesthetic to alleviate the patient’s pain. It has been demonstrated that the dorsal scapular nerve can be identified in the neck and effectively blocked using ultrasound guidance. This technique has the potential to assist in the diagnosis and treatment of neck pain originating from the middle scalene muscle.展开更多
文摘The influence of local landforms on ground motion is an important problem. The antiplane response of a scalene triangular hill to incident SH waves is studied in this paper by using a complex function, moving coordinates and auxiliary functions. First, the model is divided into two domains： a scalene triangular hill with a semi-circular bottom; and a half space with a semi-circular canyon. Wave functions that satisfy the zero-stress condition at the triangular wedges and at the horizontal surface are constructed in both domains. Then, considering the displacement continuity and stress equilibrium, algebraic equations are established. Finally, numerical examples are provided to illustrate the influence of the geometry of the hill and the characteristics of the incident waves on the ground motions.
基金Natural Science Foundation of Heilongjiang Province,China under Grant No.A201310the Scientific Research Starting Foundation for Post Doctorate of Heilongjiang Province,China under Grant No.LBH-Q13040
文摘Antiplane response of two scalene triangular hills and a semi-cylindrical canyon by SH-waves is studied using wave function expansion and complex function method. Firstly, the analytical model is divided into three parts, and the displacement solutions of wave fields are constructed based on boundary conditions in the three regions. Three domains are then conjoined to satisfy the ＂conjunction＂ condition at shared boundary. In addition, combined with the zero-stress condition of semi-cylindrical canyon, a series of infinite algebraic equations for the problem are derived. Finally, numerical examples are provided and the influence of different parameters on ground motion is discussed.
文摘Background:Coronary artery bypass grafting(CABG)is a coronary revascularization technique associated with diminished pulmonary function.During the first week after CABG,slow vital capacity(SVC)decreases by 30%–60%.Scalene muscles affect pulmonary function because they attach to the 1st and 2nd ribs.Shorter scalene muscles can decrease inhalation volume and chest expansion.Very few studies have assessed the effects of scalene stretching on SVC and chest expansion in patients post-CABG.Therefore,this study was aimed at determining the effects of scalene muscle stretching on SVC and chest expansion in such patients.Methods:A total of 74 patients post-CABG(phase 2)meeting the inclusion criteria were randomly allocated to two groups:an intervention group(n=30)performing scalene muscle stretching and a control group(n=30)performing active neck exercise.Pre&Post SVC and chest expansion were measured in all patients.A total of 14 patients wereexcluded.Statistical analysis was conducted in SPSS software(version 20.0).Results:SVC showed significant increase(P<0.05)in the intervention group compared with the control group.Chest expansion was statistically non-significant between groups(P>0.05).Conclusion and clinical implications:Scalene muscle stretching improves SVC in patients post-CABG(phase 2).Hence,scalene stretching should be included in programs for improving respiratory function.
文摘Neck pain is common and has multiple sources, but correct diagnosis and matched treatment provide the best outcomes. The first description of ultrasound-guided dorsal scapular nerve blockade using a single-shot local anesthetic technique for the diagnosis and treatment of neck pain is reported. A 38-year-old female patient presented with neck pain, and the history and clinical examination strongly suggested myofascial pain affecting the middle scalene muscle. The pain had been unresponsive to pharmacological therapy or physiotherapy. After identifying the dorsal scapular nerve (DSN) in the body of the middle scalene muscle, an ultrasound-guided nerve block was performed using a single injection of local anesthetic to alleviate the patient’s pain. It has been demonstrated that the dorsal scapular nerve can be identified in the neck and effectively blocked using ultrasound guidance. This technique has the potential to assist in the diagnosis and treatment of neck pain originating from the middle scalene muscle.
