[en] Objective: To construct canine bifurcation aneurysms suitable for evaluating the exploration of endovascular devices for interventional therapy by endovascular technique. Methods: The right common carotid artery of six dogs was expanded with a pliable balloon by means of endovascular technique, then embolization with detached balloon was taken at their originations DAS examination were performed on 1, 2, 3 d after the procedurse. Results: 6 aneurysm models were created in six dogs successfully with the mean width and height of the aneurysms decreasing in 3 days. Conclusions: This canine aneurysm model presents the virtue in the size and shape of human cerebral bifurcation saccular aneurysms on DSA image, suitable for developing the exploration of endovascular devices for aneurismal therapy. The procedure is quick, reliable and reproducible. (authors)

[en] The work was to study anti-radiation effects of a drug extracted from lyeopodium complanatum (LC), a herb in traditional Chinese medicine. Different dosages of the LC drug were given to mice at different administration time. The survival rate and indexes of body weight difference, spleen weight, leukocyte number in the blood and nuclear cell number in the thigh bone, were measured. The results showed that the mice given 1000 mg/kg of the ethanol extract of LC by PO 2 h before irradiation could increase their survival rate by 20% during 30 d in comparison with the control (p<0.005). (authors)

[en] An integrated container performance parameter testing device is developed for the packaging container with metal as material. It is suitable for the comprehensive performance test of the metal packaging container, and can realize the rapid and accurate measurement of the volume, sealing, vacuum degree and pressure strength of the metal packing container. This paper introduces the working principle, hardware structure, software system and testing function of the device. The hardware system is composed of differential pressure sensor, absolute pressure sensor, temperature sensor, mass flow controller and USB-2611 high speed acquisition card. The application program of data acquisition and processing based on LabVIEW is designed. This system can realize the function of collecting, storing, real-time displaying and processing analysis. The experimental results show that the device can measure the volume, sealing, vacuum and compressive strength of metal packaging container quickly and accurately. (paper)

[en] The objective of this study was to evaluate the dose conformity and feasibility of whole-brain radiotherapy with a simultaneous integrated boost by forward intensity-modulated radiation therapy in patients with 1 to 3 brain metastases. Forward intensity-modulated radiation therapy plans were generated for 10 patients with 1 to 3 brain metastases on Pinnacle 6.2 Treatment Planning System. The prescribed dose was 30 Gy to the whole brain (planning target volume [PTV]_wbrt) and 40 Gy to individual brain metastases (PTV_boost) simultaneously, and both doses were given in 10 fractions. The maximum diameters of individual brain metastases ranged from 1.6 to 6 cm, and the summated PTVs per patient ranged from 1.62 to 69.81 cm³. Conformity and feasibility were evaluated regarding conformation number and treatment delivery time. One hundred percent volume of the PTV_boost received at least 95% of the prescribed dose in all cases. The maximum doses were less than 110% of the prescribed dose to the PTV_boost, and all of the hot spots were within the PTV_boost. The volume of the PTV_wbrt that received at least 95% of the prescribed dose ranged from 99.2% to 100%. The mean values of conformation number were 0.682. The mean treatment delivery time was 2.79 minutes. Ten beams were used on an average in these plans. Whole-brain radiotherapy with a simultaneous integrated boost by forward intensity-modulated radiation therapy in 1 to 3 brain metastases is feasible, and treatment delivery time is short

[en] Objective: To explore the feasibility and safety of using 6 F guiding catheter to perform the carotid artery stenting (CAS) via transradial approach (TRA). Methods: A retrospective analysis of 28 cases with carotid atherosclerotic stenosis who were using 6 F guiding catheter to perform the CAS via TRA, and the preoperative assessment confirmed that some of whom were difficult to operate via femoral artery, or couldn't tolerate the lying in bed after the operation, and the others were failure to perform via femoral artery. The atherosclerotic carotid stenosis lesion of 9 cases were located in the left internal carotid artery (ICA), and the other 19 cases were in the right ICA. All the patients were performed via the right radial artery approach, a 6 F guiding catheter was used to super-select the target vessel, implanted the distal protection device, then underwent balloon angioplasty and stent implantation. We observed and recorded that whether the guiding catheters were in the right places, the success rate of stent implantation, the incidence of radial artery spasm and the puncture site bleeding. The postoperative pulse and occlusion of radial artery, and the occurrence of cardio-cerebrovascular complications during perioperative period were also observed. The fluoroscopy time of surgery ray were also recorded, and compared with corresponding 30 cases who were performed CAS via the tranfemoral approach (TFA) by t test. Results The guiding catheters were in the right places and stenting success of all the 28 cases. There was no significant difference in the fluoroscopy time between TRA and TFA group [(8.6 ± 1.4) min vs. (9.0 ± 2.1) min, t = -0.717, P = 0.477)]. Two cases appeared radial artery spasm after puncture, and 1 case experienced puncture site bleeding at 8 h after the operation. After examined the radial artery by color doppler ultrasound at 1 week after the operation, we found that blood flow of 27 cases were patency, but another 1 was slowed down, which was restored at 3 months follow up. None of the cases occurred cerebrovascular events in the present research. Conclusion: Transradial approach for CAS using 6 F guiding catheter is safe and technically feasible. (authors)

[en] A neo-type nuclear magnetic resonance logging tool-MR Scanner was put out by Schlumberger. MR Scanner is eccentrically and gradiently designed. It can provide multiple investigation depth and its measurements are not affected by borehole conditions, and it can also characterize fluid. It has great advantages in reservoir evaluation of low resistivity and low contrast ratio. The structure, characteristics, specification and parameter indices of MR Scanner are explained in detail. Together with its advantages and application effect in reservoir evaluation are explained. (authors)

[en] In this paper, the effects of material parameters on the band gaps of two-dimensional (2D) three-component phononic crystals (PCs) are investigated based on improved plane wave expansion method (IPWE). The theoretical derivation is based on the elastic wave equations, and the effects on band gaps for both in-plane (xy-mode) and anti-plane modes (z-mode) are discussed in detail. Results show that the material parameters directly determining the band gaps include mass density ratio, shear modulus ratio, and Poisson’s ratio for xy-mode, and mass density ratio and shear modulus ratio for z-mode; for the three-component PCs with Bragg gaps, wide band gap appears in the case of large density mismatches and large shear modulus ratio of scatterer to matrix, and the Poisson’s ratio of the matrix has more influence on the band gap; for the three-component PCs with local resonance gaps, wide band gap appears in the case of large mass density ratio of scatterer to matrix and small mass density ratio of coating layer to matrix, large shear modulus ratio of scatterer to matrix and small shear modulus ratio of coating layer to matrix. These conclusions can be used to guide the band gap designing of the three-component PCs.

[en] The surface loose sand with particle size less than 10mm was used as the experimental bulk material, and the negative pressure collection experiment of surface bulk material was carried out by using the rectangular nozzle. The influence of collection parameters such as the system air volume, nozzle movement speed, and suction nozzle height above the ground on the sand collection thickness was studied. The research shows that the collection thickness of bulk material increases with the increase of system air volume and is proportional to the second power of system air volume. The collection thickness decreases with the increase of the moving velocity of the nozzle and is proportional to the -0.5 power of the moving velocity of the nozzle. The collection thickness decreases sharply with the increase of the height above the ground of the suction nozzle, and is basically 0 when the height above the ground is greater than 20mm.The mathematical model of the relationship between sand collection thickness and collection parameters is established by using fuzzy reasoning method. The accurate prediction of sand collection thickness under given collection parameters is realized by rule inference. Experimental results show that the prediction error is less than 10%. (paper)

[en] Objective: To prepare a new thrombus model by fluid model method, which is suitable for evaluation of mechanical thrombectomy devices for acute stroke. Methods: The fluid model adopted the Chandler loop theory, while the static model adopted conventional method. Mechanical properties of thrombi prepared by fluid model and static model were measured by manual elongation test (15 samples in each group) and catheter injection test (15 samples in each group). Histological structure was compared among the above thrombus models (5 samples in each group) and specimens of five patients with stroke by hematoxylin-eosin staining method. Then, thrombi in fluid model were utilized to establish embolization of vessels in swine model (two pigs) for evaluation of radiopacity. Independent-Sample test was performed to compare the maximum tensile length of two methods, and Fisher's exact test was used to compare the rate of thrombus fragmentation after catheter injection test. Results: The maximum tensile length of two models were (4.28 ± 0.23) and (3.16 ± 0.13) cm, respectively, and the difference was statistically significant (t = 16.38, P < 0.01); After catheter injection, the fracture rates of thrombus were 13% (2/15) and 60% (9/15), which were also statistically significant (P < 0.05). As to histological structure, thrombi prepared by fluid model showed mixed thrombus structure, which similar to thrombi of stroke patients, But thrombi prepared by static model were replete with erythrocytes under the microscope. A total of eight vessels (lingual arteries and superficial cervical arteries) in two swines were successfully occlusive (TIMI 0 or 1), and sufficient radiopacity of each injected thrombus was observed. Conclusions: The thrombi prepared by fluid model not only have good mechanical stability and sufficient radiopacity, but their histological structure is similar to thromboemboli retrieved from cerebral arteries of patients with acute stroke. (authors)

[en] Highlights: • High pressure density data of n-decane and m-xylene mixtures were reported. • The sPC-SAFT and CPA EoSs were applied to predict the densities of n-decane and m-xylene and their mixtures. • The effects of pressure and temperature on the excess molar volume were discussed. -- Abstract: In this work, the experimental measurements for liquid densities of n-decane and m-xylene binary mixtures were performed over the entire composition range with a high-pressure vibrating-tube densimeter. The range of temperatures for the present measurements was from 293.15 K to 363.15 K and the pressures were up to 60 MPa. The combined expanded uncertainty of the density measurements is estimated to be 0.001ρ with 0.95 confidence. Experimental density values were correlated by the modified Tammann-Tait equation. The simplified Perturbed Associating Fluid Theory (sPC-SAFT) and Cubic Plus Associated (CPA) equations of state (EoS) were applied to predict the densities of n-decane and m-xylene and their mixtures. Reasonably results were observed between the experimental data and calculated results for the two equations, and the deviation is less than 0.48% and 0.89% with sPC-SAFT and CPA EoS, respectively. In addition, excess molar volumes were determined from the experimental density data as well as from sPC-SAFT and CPA models. The effects of pressure and temperature on the excess molar volume were also discussed.