Background Midgastric transverse band （MTB） was first observed over 100 years ago, after that many researchers worked on the subject postulated its physiologic role and the role in gastrointestinal diseases, but its...Background Midgastric transverse band （MTB） was first observed over 100 years ago, after that many researchers worked on the subject postulated its physiologic role and the role in gastrointestinal diseases, but its function remains unclear. With progress of imaging methods, the nature of MTB is unveiling. In this study we investigated the effect of MTB on the gastric empting delay in functional dyspepsia （FD） and explored the mechanism. Methods A total of 60 patients with FD and 65 age- and sex-matched healthy people who served as controls were studied. With ^99mTc-DTPA labeled semi-solid fat-parched flour served as test meal, gastric empting was examined in all subjects by using single photon emission computed tomography. Test meal was designated as general （60 g fat-parched flour） or large （80 g fat-parched flour） meal. Stomach was divided into proximal and distal parts by MTB. Half gastric empting time, areas of different gastric parts, intragastric food distribution and MTB width were tested with in given times. Results Patients with FD showed a delayed gastric empting and increased intragastric residue. Global and regional gastric erupting velocity was decreased. The areas of distal stomach and MTB were significantly greater in the FD patients than in the controls. Throughout the whole test period a distal stomach-dominated food distribution was shown. Those who took a large meal had longer half gastric empting time and greater MTB area than those who took a general meal. Conclusions Gastric empting delay is related to enlarged MTB area. Some dyspeptic symptoms may be induced by abnormal distribution and increased retention of food in distal stomach. MTB, being like atriaventricular valve that controls blood flow in heart, regulates transport, distribution, and empting of food in the stomach.展开更多
This paper investigates the adjacent interactions of three novel solitons for the quintic complex Ginzburg-Landau equation, which are plain pulsating, erupting and creeping solitons. It is found that different perform...This paper investigates the adjacent interactions of three novel solitons for the quintic complex Ginzburg-Landau equation, which are plain pulsating, erupting and creeping solitons. It is found that different performances are presented for different solitons due to isolated regions of the parameter space where they exist. For example, plain pulsating and erupting solitons exhibit mutual annihilation during collisions with the decrease of total energy, but for creeping soliton, the two adjacent pulses present soliton fusion without any loss of energy. Otherwise, the method for restraining the interactions is also found and it can suppress interactions between these two adjacent pulses effectively.展开更多
The understanding of soliton dynamics promotes the development of ultrafast laser technology. High-energy purequartic solitons(PQSs) have gradually become a hotspot in recent years. Herein, we numerically study the in...The understanding of soliton dynamics promotes the development of ultrafast laser technology. High-energy purequartic solitons(PQSs) have gradually become a hotspot in recent years. Herein, we numerically study the influence of the gain bandwidth, saturation power, small-signal gain, and output coupler on PQS dynamics in passively mode-locked fiber lasers. The results show that the above four parameters can affect PQS dynamics. Pulsating PQSs occur as we alter the other three parameters when the gain bandwidth is 50 nm. Meanwhile, PQSs evolve from pulsating to erupting and then to splitting as the other three parameters are altered when the gain bandwidth is 10 nm, which can be attributed to the existence of the spectral filtering effect and intra-cavity fourth-order dispersion. These findings provide new insights into PQS dynamics in passively mode-locked fiber lasers.展开更多
Erupting-flow types of geothermal wells in the Yangbajain geothermal field, China, are proposed based on internal energy of geothermal fluids and hydrogeologic-dynamic conditions of wellbore. An erupting-flow model, w...Erupting-flow types of geothermal wells in the Yangbajain geothermal field, China, are proposed based on internal energy of geothermal fluids and hydrogeologic-dynamic conditions of wellbore. An erupting-flow model, which is adaptable to the steaming and erupting of flow from wells in the field, has been verified by actual cases.展开更多
文摘Background Midgastric transverse band （MTB） was first observed over 100 years ago, after that many researchers worked on the subject postulated its physiologic role and the role in gastrointestinal diseases, but its function remains unclear. With progress of imaging methods, the nature of MTB is unveiling. In this study we investigated the effect of MTB on the gastric empting delay in functional dyspepsia （FD） and explored the mechanism. Methods A total of 60 patients with FD and 65 age- and sex-matched healthy people who served as controls were studied. With ^99mTc-DTPA labeled semi-solid fat-parched flour served as test meal, gastric empting was examined in all subjects by using single photon emission computed tomography. Test meal was designated as general （60 g fat-parched flour） or large （80 g fat-parched flour） meal. Stomach was divided into proximal and distal parts by MTB. Half gastric empting time, areas of different gastric parts, intragastric food distribution and MTB width were tested with in given times. Results Patients with FD showed a delayed gastric empting and increased intragastric residue. Global and regional gastric erupting velocity was decreased. The areas of distal stomach and MTB were significantly greater in the FD patients than in the controls. Throughout the whole test period a distal stomach-dominated food distribution was shown. Those who took a large meal had longer half gastric empting time and greater MTB area than those who took a general meal. Conclusions Gastric empting delay is related to enlarged MTB area. Some dyspeptic symptoms may be induced by abnormal distribution and increased retention of food in distal stomach. MTB, being like atriaventricular valve that controls blood flow in heart, regulates transport, distribution, and empting of food in the stomach.
基金Project supported by the National Natural Science Foundation of China （Grant No 60477026）.
文摘This paper investigates the adjacent interactions of three novel solitons for the quintic complex Ginzburg-Landau equation, which are plain pulsating, erupting and creeping solitons. It is found that different performances are presented for different solitons due to isolated regions of the parameter space where they exist. For example, plain pulsating and erupting solitons exhibit mutual annihilation during collisions with the decrease of total energy, but for creeping soliton, the two adjacent pulses present soliton fusion without any loss of energy. Otherwise, the method for restraining the interactions is also found and it can suppress interactions between these two adjacent pulses effectively.
基金the financial support from Science and Technology Project of the Jilin Provincial Department of Education (Grant No. JJKH20231171KJ)。
文摘The understanding of soliton dynamics promotes the development of ultrafast laser technology. High-energy purequartic solitons(PQSs) have gradually become a hotspot in recent years. Herein, we numerically study the influence of the gain bandwidth, saturation power, small-signal gain, and output coupler on PQS dynamics in passively mode-locked fiber lasers. The results show that the above four parameters can affect PQS dynamics. Pulsating PQSs occur as we alter the other three parameters when the gain bandwidth is 50 nm. Meanwhile, PQSs evolve from pulsating to erupting and then to splitting as the other three parameters are altered when the gain bandwidth is 10 nm, which can be attributed to the existence of the spectral filtering effect and intra-cavity fourth-order dispersion. These findings provide new insights into PQS dynamics in passively mode-locked fiber lasers.
文摘Erupting-flow types of geothermal wells in the Yangbajain geothermal field, China, are proposed based on internal energy of geothermal fluids and hydrogeologic-dynamic conditions of wellbore. An erupting-flow model, which is adaptable to the steaming and erupting of flow from wells in the field, has been verified by actual cases.
