Solid-Pseudopapillary Tumor (SPT) of the pancreas is considered to be a rare pancreatic tumor that occurs in young females. Most SPTs are considered to be benign. However, the natural course of history has not yet bee...Solid-Pseudopapillary Tumor (SPT) of the pancreas is considered to be a rare pancreatic tumor that occurs in young females. Most SPTs are considered to be benign. However, the natural course of history has not yet been clarified. We reported a case of 25-year-old women with a patent history of splenectomy for hemolytic anemia, who presented intermittent abdominal pain and vomiting of 6 months ago. Physical examination revealed a hard mass of 8 × 5 cm in the left upper quadrant of the abdomen. Routine laboratory tests were within the normal range. CT-Scan showed an 8 × 6 cm lesion with irregular low density in the body and the tail of the pancreas. MRI showed a mass of 8 cm, surrounded by a capsule, with the irregular intensity both in T1 and T2 enhanced-images. Distal pancreatictomy was done as a definitive treatment via a Bi sub costal incision. Histopathological examination confirmed the diagnosis of SPT. There was no vascular invasion or other malignant features. The resection margins are free of lesions. The post operative course was uneventful. During post operative follow-up of 24 months, there is no sign of recurrence on CT-scan. SPT is a rare condition with a low potential for malignancy and favorable prognosis. Surgical resection is generally curative. Characteristic CT and MRI scans combined with age and sex profile should be sufficient for the diagnosis and the decision to operate.展开更多
By means of an extended variational approach,we study dynamics for gap solitons in a repulsive interactionBose-Einstein condensate under both a harmonic and an optical lattice confinement.The simplified analytic theor...By means of an extended variational approach,we study dynamics for gap solitons in a repulsive interactionBose-Einstein condensate under both a harmonic and an optical lattice confinement.The simplified analytic theorygives the critical strength ratio of harmonic to optical lattice necessary to support multiple stable lattice sites for thecondensate.Moreover,we use numerical experiments to guide and manipulate the gap solitons to an arbitrary positionvia a time-dependent potential.All predictions of the extended variational approach are reasonably close to results ofthe simulations.In particular,the variational model helps capture the composition relationship between the variationsof chirp and amplitude.展开更多
A high order finite difference scheme for solving the Regularised Long Wave(RLW) equation, based on the high order Pade approximation and Lax-Wendroff type timediscretization, was developed in this paper. Some numeric...A high order finite difference scheme for solving the Regularised Long Wave(RLW) equation, based on the high order Pade approximation and Lax-Wendroff type timediscretization, was developed in this paper. Some numerical examples, including the propagation of asingle soliton, the interaction of double solitary waves and the temporal evolution of a Maxwellianinitial pulse, were studied to test the accuracy, efficiency and conservation property of thescheme. Compared with the results based on finite element methods, the scheme is proven successful.展开更多
We synthesize continuous solid solutions with monophasic zircon-type structure of vanadates of formula YxBi0.95 VO4：0.05Dy^3＋ （x = 0-0.95） using a combined method of co-precipitation and hydrothermal synthesis. Th...We synthesize continuous solid solutions with monophasic zircon-type structure of vanadates of formula YxBi0.95 VO4：0.05Dy^3＋ （x = 0-0.95） using a combined method of co-precipitation and hydrothermal synthesis. The X-ray diffractometer patterns confirm the formation of a solid solution of YBi0.95-xVO4：0.05Dy^3＋, and the results show that all the samples have monophasic zircon-type structure. The absorption spectra of the prepared phosphors show a blue-shift of the fundamental absorption band edge with increasing Y^3＋ content. An intense tunable characteristic emission of Dy^3＋ is observed with the increasing ratio of Y/Bi. Finally, the mechanism of luminescence of Dya＋ in the YBi0.95 VO4：0.05Dya＋ （x = 0-0.95） solid solution is analyzed and discussed.展开更多
文摘Solid-Pseudopapillary Tumor (SPT) of the pancreas is considered to be a rare pancreatic tumor that occurs in young females. Most SPTs are considered to be benign. However, the natural course of history has not yet been clarified. We reported a case of 25-year-old women with a patent history of splenectomy for hemolytic anemia, who presented intermittent abdominal pain and vomiting of 6 months ago. Physical examination revealed a hard mass of 8 × 5 cm in the left upper quadrant of the abdomen. Routine laboratory tests were within the normal range. CT-Scan showed an 8 × 6 cm lesion with irregular low density in the body and the tail of the pancreas. MRI showed a mass of 8 cm, surrounded by a capsule, with the irregular intensity both in T1 and T2 enhanced-images. Distal pancreatictomy was done as a definitive treatment via a Bi sub costal incision. Histopathological examination confirmed the diagnosis of SPT. There was no vascular invasion or other malignant features. The resection margins are free of lesions. The post operative course was uneventful. During post operative follow-up of 24 months, there is no sign of recurrence on CT-scan. SPT is a rare condition with a low potential for malignancy and favorable prognosis. Surgical resection is generally curative. Characteristic CT and MRI scans combined with age and sex profile should be sufficient for the diagnosis and the decision to operate.
基金Supported by the National Natural Science Foundation of China under Grant No. 10672147the Natural Science Foundation of Zhejiang Province, China under Grant Nos. Y605312, Y1080959the Department of Education Foundation of Zhejiang Province under Grant No. 20030704
文摘By means of an extended variational approach,we study dynamics for gap solitons in a repulsive interactionBose-Einstein condensate under both a harmonic and an optical lattice confinement.The simplified analytic theorygives the critical strength ratio of harmonic to optical lattice necessary to support multiple stable lattice sites for thecondensate.Moreover,we use numerical experiments to guide and manipulate the gap solitons to an arbitrary positionvia a time-dependent potential.All predictions of the extended variational approach are reasonably close to results ofthe simulations.In particular,the variational model helps capture the composition relationship between the variationsof chirp and amplitude.
文摘A high order finite difference scheme for solving the Regularised Long Wave(RLW) equation, based on the high order Pade approximation and Lax-Wendroff type timediscretization, was developed in this paper. Some numerical examples, including the propagation of asingle soliton, the interaction of double solitary waves and the temporal evolution of a Maxwellianinitial pulse, were studied to test the accuracy, efficiency and conservation property of thescheme. Compared with the results based on finite element methods, the scheme is proven successful.
基金supported by the National 973 P rogram of China(No.2011CB211708)the National Natural Science Foundation of China(Nos.51272097,61265004,and 61307111)
文摘We synthesize continuous solid solutions with monophasic zircon-type structure of vanadates of formula YxBi0.95 VO4：0.05Dy^3＋ （x = 0-0.95） using a combined method of co-precipitation and hydrothermal synthesis. The X-ray diffractometer patterns confirm the formation of a solid solution of YBi0.95-xVO4：0.05Dy^3＋, and the results show that all the samples have monophasic zircon-type structure. The absorption spectra of the prepared phosphors show a blue-shift of the fundamental absorption band edge with increasing Y^3＋ content. An intense tunable characteristic emission of Dy^3＋ is observed with the increasing ratio of Y/Bi. Finally, the mechanism of luminescence of Dya＋ in the YBi0.95 VO4：0.05Dya＋ （x = 0-0.95） solid solution is analyzed and discussed.
