[en] Highlights: • Measured solubility data of CO₂ in 2-methoxyethyl acetate, 1-methoxy-2-propyl acetate and 3-methoxybutyl acetate. • Calculated Henry’s constant and thermodynamic properties of selected systems. • Concluded that selected absorbents have potential research value for CO₂ capture. - Abstract: The solubilities of CO₂ in 2-methoxyethyl acetate, 1-methoxy-2-propyl acetate, and 3-methoxybutyl acetate were measured by isothermal synthesis method under pressures up to 1.2 MPa and at temperatures ranging from (293.15 to 333.15) K. Henry’s constant was calculated based on experimental data regression. The solubilities of CO₂ were found to increase with decreased temperature and increased the methyl group to the molecular structure of the absorbent. Henry’s constant and volumetric solubility of selected absorbents at T = 298.15 K were compared with those of commercial absorbents and common solvents. 3-Methoxybutyl acetate showed the best performance by mole fraction, and 2-methoxyethyl acetate behaved the best by volumetric fraction. Based on Henry’s constant, thermodynamic properties such as Gibbs free energy of solution, enthalpy of solution, and absorption entropy of solution were determined. These properties are very essential for designing an absorption process

[en] This paper presents a 2.5-dimensional finite element forward algorithm for calculating transient electromagnetic responses by a magnetic source when the conductivity varies continuously within each block. The main differences between this method and those in previous works are as follows: the conductivity parameter in a mesh cell varies linearly but is not a uniform value; in modelling transient electromagnetic method (TEM) data, the electromagnetic field is separated into a primary (background) and a secondary (scattered) field to avoid a source singularity. The background field is solved by an analytical method where only the components of electric and magnetic fields along-strike of a geoelectric structure are computed, and the secondary field caused by anomalous bodies is computed numerically. Finally, numerical checks of several typical examples against analytical solutions show that the solution provides accurate results

[en] Objective: To evaluate the value on temporary balloon occlusion of the abdominal aorta to decrease blood loss during the removal of sacral tumors. Methods: Six patients with sacral tumors including giant cell tumor 4 and chordoma 2, were implanted balloon catheter in the abdominal aorta below the orifice of renal artery via femoral artery approach before surgical operation. The balloon was inflated every 45 minutes with 10 minutes of free interval during surgical operation. Blood loss was recorded and operation effect was observed. Results: In interventional department every case needed about 30-60 minutes for successful placement of' the balloon catheter before the surgical operation. The balloon was inflated for blood flow occlusion from 40 minutes to 130 minutes accumulatively and blood loss ranged from 800 ml to 2000 ml (mean 1350 ml)during the surgical operation. All the tumors of 6 cases were removed successfully and without complications, including acute renal failure. Conclusions: The temporary balloon occlusion technique is safe and simple, which can make the removal of sacral tumors more safer with less blood loss. (authors)

[en] HT-7 is the first superconducting tokamak device for fusion research in China. Many experiments have been setup in that machine since it built s, and a lot of satisfactory results have been obtained in the fusion research field on HT-7 tokamak. The basic scheme of the control system is the communication through the net, and the basic unit is the personal computer. In order to design a control and data acquisition system with the opening, the different class and the general application for HT-7 device, a distributing system is built, which includes the main control subsystem, data acquisition and analysis subsystem, ph sics data management subsystem and other subsystems. The main control, the communication with the local area net and the data management subsystems are described in details and the other subsystems will be introduced

[en] Objective: To assess the clinical value of bilateral uterine artery chemotherapy embolization (UACE) for cervical ectopic pregnancy analyzed. Methods: Clinical records of 40 patients with cervical ectopic pregnancy treated using UACE were retrospectively analyzed. Results: 8 patients with severe active vaginal bleeding after curettage were treated urgently with UACE. The remaining 32 patients were treated with UACE combined with sequential ultrasound-guided curettage. Active vaginal bleeding was stopped after UACE. There was no recurrent hemorrhage with the sequential ultrasound-guided curettage procedure. The β-HCG levels of all patients were normalized after 1 month. Conclusion: Bilateral uterine artery chemotherapy embolization is valuable as emergency treatment for patients with severe vaginal bleeding from cervical ectopic pregnancy. UACE combined with sequential ultrasound-guided curettage may be more effective. (authors)

[en] Objective: To investigate the feasibility and application scope of the looping technique by using a gooseneck snare and a loach guide wire in retrieving tubular foreign bodies within the vascular or ureteral duct. Methods: During the period from July 2009 to Dec. 2013, six patients with ruptured catheter were admitted to authors' hospital. All six patients were females. Three patients had internal ruptured peripherally inserted central venous catheter (PICC), one patient had ruptured implantable venous access port catheter and two patients had replacement of double 'J' ureteral catheter stent. By using looping technique, i.e. a loach guide wire and a gooseneck snare were separately placed at the two ends of the tubular foreign body, then the gooseneck snare entangled the soft leading end of the loach guide wire to form a annular structure to seize the ruptured tubular catheter and then to pull it out of the body. Results: With the help of the looping technique, the internal ruptured catheter or the double 'J' ureteral catheter was successfully removed in all the six patients. Conclusion: For the retrieval of the tubular foreign bodies within the vascular or ureteral duct, the looping technique by using a gooseneck snare and a loach guide wire is an effective and fast treatment. Therefore, this technique should be recommended in the clinical practice. (authors)

[en] Objective: To evaluate the safety and effectiveness of thoracic endovascular aortic repair (TEVAR) in treating Standford type B thoracic aortic dissection complicated by type A intramural hematoma. Methods: From October 2015 to January 2017, a total of 3 patients with Standford type B thoracic aortic dissection complicated by type A intramural hematoma were admitted to authors' hospital to receive treatment. After admission, conservative treatment such as stabilizing blood pressure and heart rate, symptomatic medication, etc. were carried out for 14 days, then, TEVAR was performed. Results: Successful TEVAR was accomplished in all 3 patients, no serious complications, such as reverse tear, occurred. One month after TEVAR, reexamination of total aortic CT angiography revealed that the rupture of dissection was completely closed with no internal leakage, the blood flow in the true lumen was obviously improved, the intramural hematoma was remarkably absorbed and faded away, and the wall thickness of ascending aorta returned to normal range. The clinical symptoms were greatly improved, no serious complications such as paraplegia or death occurred. Conclusion: For the treatment of Standford type B thoracic aortic dissection complicated by type A intramural hematoma, TEVAR performed at 14 days after the onset of disease is safe and effective if the ascending aorta intima is intact and the clinical symptoms are relived after medication of lowering blood pressure and heart rate. (authors)

[en] Objective: To evaluate the efficacy of two-step splenic artery embolization in the treatment of portal hypertension secondary to pancreatitis. Methods: Splenic artery embolization was performed in 9 patients with portal hypertension secondary to chronic (7) and acute (2) pancreatitis using a two-step method. Partial splenic embolization was performed initially with the PVA particles to cause infarction of 60%-70% of the splenic parenchyma. After 4-6 weeks, the remaining spleen was embolized with PVA particles and the splenic artery was embolized using coils. The effect of embolization was assessed using CT and clinical followup. Results: Splenic artery embolization was successfully performed in all patients without complications of splenic abscess. CT demonstrated 85%-90% infarction of the spleen and reduction or disappearance of the varices. During the 20-35 month follow-up, there was no upper gastrointestinal bleeding in any of the patients. Conclusions: Two-step splenic artery embolization is effective in the treatment of pancreatitis-induced portal hypertension without complications. (authors)

[en] Objective: To discuss the clinical application of ultrasound-CT double-guided radiofrequency ablation(RFA) in treating hepatic tumors. Methods: Fifteen patients with 20 liver tumor lesions were included in this study. Ultrasound-CT double-guided radiofrequency ablation was employed in all patients. First, under ultrasound guidance the electrode of RFA was inserted to the site close to the lesion, then, guided by CT scanning the accurate positioning of the electrode was accomplished and RFA procedure was completed. Results: The accurate puncturing of the electrode was achieved in all 20 hepatic lesions, and the RFA procedure was successfully performed in a short time. Follow-up examination showed that there was no obvious residual tumor tissue, and no RFA-related complications occurred in all the 15 patients. Conclusion: Under ultrasound-CT double-guidance, the percutaneous transhepatic puncturing can be more accurately accomplished, which can ensure a successful RFA procedure. This technique is especially useful when the hepatic tumor is incomplete or unclear on ultrasonograph, and it can improve the puncturing accuracy and reduce the complications as well. (authors)

[en] Objective: To study the feasibility of using gooseneck snare combined with 0.035 inch loach guidewire for subintimal angioplasty in iliac artery occlusion, and to discuss its clinical indications. Methods During the period from October 2011 to May 2013, 3 cases with unilateral complete iliac artery occlusion were admitted to authors' hospital. As the guidewire inserted from the healthy side could not returned into the true lumen once it entered into the subintimal space of the iliac artery, the puncture at the diseased side was carried out and the guidewire was pushed into the artery, but the catheter and the guidewire could not converge or anastomose in the subintimal site, gooseneck snare had to be used to grab the guidewire in subintimal site as to establish a path and completed the angioplasty. Results: Successful and safe balloon dilatation and stent implantation were accomplished in all the 3 patients, and the patients complained of no special discomfort. Conclusion: In performing the subintimal angioplasty for patients with iliac artery occlusion, the use of gooseneck snare combined with retrograde insertion of guidewire should be considered when it occurs that the guidewire can not return into the true lumen after it enters into the subintimal space. Nevertheless,gentle manipulation is first important in order to avoid the possible rupture of vessels. (authors)