Transformers are required to demonstrate the ability to withstand short circuit currents. Over currents caused by short circuit can give rise to windings deformation. In this paper, a novel method is proposed to monitor the state of transformer windings, which is achieved through on-line detecting the leakage inductance of the windings. Specifically, the mathematical model is established for on-line identifying the leakage inductance of the windings by applying least square algorithm (LSA) to the equivalent circuit equations. The effect of measurement and model inaccuracy on the identification error is analyzed, and the corrected model is also given to decrease these adverse effect on the results. Finally, dynamic test is carried out to verify our method. The test results clearly show that our method is very accurate even under the fluctuation of load or power factor. Therefore, our method can be effectively used to on-line detect the windings deformation.

Transformers are required to demonstrate the ability to withstand short circuit currents. Over currents caused by short circuit can give rise to windings deformation. In this paper, a novel method is proposed to monitor the state of transformer windings, which is achieved through on-line detecting the leakage inductance of the windings. Specifically, the mathematical model is established for on-line identifying the leakage inductance of the windings by applying least square algorithm (LSA) to the equivalent circuit equations. The effect of measurement and model inaccuracy on the identification error is analyzed, and the corrected model is also given to decrease these adverse effect on the results. Finally, dynamic test is carried out to verify our method. The test results clearly show that our method is very accurate even under the fluctuation of load or power factor. Therefore, our method can be effectively used to on-line detect the windings deformation.

Objective To evaluate the clinical application of Hawkeye VG SPECT/CT imaging on diagnosing and locating lower gastrointestinal bleeding using in vivo labeling 99Tcm-RBC.Methods Fiftysix patients (42 males,14 females,age ranging from 10 to 76 years) who had definite lower gastrointestinal bleeding were studied retrospectively.All patients had intravenous injection with 370 MBq 99Tcm-RBC and then underwent planar,SPECT,and CT imaging respectively in the abdomen before exploratory laparotomy.Images from SPECT and CT were fused thereafter to locate the active bleeder,if any.x2 test was performed to show the differences of diagnostic sensitivity and accuracy between planar and SPECT/CT imaging.Results In 56 patients with lower gastrointestinal bleeding,50 patients showed abnormally concentrated radionuclide activity with planar images and 52 patients showed the similar imaging pattern with SPECT/CT.Among these patients,concordant bleeding with operation findings was found in 31 patients with planar images and 48 patients with SPECT/CT images.The sensitivity and accuracy were 89.3％ (50/56) and 73.8％ (31/42) in planar images,and 92.9％ (52/56) and 92.3％ (48/52) in SPECT/CT images (x2 =0.11,P＞0.05 ;x2 =4.63,P＜0.05).Conclusion Hawkeye VG SPECT/CT imaging shows an effective,simple and accurate method and could be used for diagnosing and locating lower gastrointestinal bleeding.

Objective To observe the treatment effect of acupoint massage and auricular point sticking of cowherb seeds on blood pressure of hypertensive patients.Methods 100 cases of hypertensive patients were randomly divided into the observation group and the control group,50 cases in each.The observation group was given routine application of antihyportensive drags combined with acupoint massage and auricular point sticking of cowherb seeds.The control group received routine drug therapy.The blood pressure changes were compared between the two groups before and after treatment.Results The systolic blood pressure and diastolic blood pressure of both groups were lower after treatment compared with those before treatment.The total effective rate of blood pressure control was 98％ in the observation group,88％ in the control group,which showed no significant difference.Symptom control results showed that the total effective rate of the observation group was higher than that of the control group.Conclusions Acupoint massage and auricular point sticking of cowherb seeds in hypertensive patients can be an auxiliary pressure relief means,it can not only effectively lower blood pressure,but show good effect in alleviation of headache,vertigo,irritability.

Objective: To observe the effects of Jinqi Jiangtang Tablet, a compound Chinese herbal medicine, on serum matrix metalloproteinase-9 (MMP-9) level and MMP-9 expression in peripheral blood monocytes of rats with streptozocin-induced diabetes. Methods: Thirty Wistar rats were randomly divided into 3 groups: control group, untreated group and Jinqi Jiangtang Tablet group. Diabetes in rats was induced by a single intraperitoneal injection of streptozocin (70mg/kg body weight). After model building, rats in the Jinqi Jiangtang Tablet group were administered with Jinqi Jiangtang tablets at a dose of 0.8 g/(kg·d) for 6 weeks and rats in the control group and the untreated group were treated with normal saline. After treatment, level of fasting serum glucose was detected by hexokinas method; serum MMP-9 level was tested by enzyme-linked immunosorbent assay; MMP-9 expression in peripheral blood monocytes was measured by reverse transcription-polymerase chain reaction and Western blot method. Results: After treatment, fasting serum glucose level in the Jinqi Jiangtang Tablet group was less than that in the untreated group (P<0.05). After modeling, the serum MMP-9 level of rats in the untreated group was (9.11±3.55) μg/L and that in Jinqi Jiangtang Tablet group was (8.97±3.07) μg/L, which were higher than that in the control group ((4.39±1.44) μg/L) (P<0.01). After gavage, the level of serum MMP-9 was lower in Jinqi Jiangtang Tablet group than in the untreated group (P<0.05). The expression of MMP-9 in peripheral blood monocytes in the untreated group was higher than that in the control group (P<0.05). The MMP-9 expression in peripheral blood monocytes of rats with diabetes was down-regulated by Jinqi Jiangtang Tablet (P<0.05). Conclusion: Jinqi Jiangtang Tablet can decrease the level of serum MMP-9 and down-regulate the MMP-9 expression in peripheral blood monocytes at both mRNA and protein levels in rats with diabetes.

OBJECTIVE: To establish an HPLC method for simultaneous determination of peoniflorin,calycosin and ferulic acid in Kangmin granules.METHODS: The separation was performed on a Kromasil C18 column (250 mm?4.6 mm,5 ?m),and the mobile phase consisted of methanol-acetonitrile-0.4% phosphonic acid (20 ∶ 10 ∶ 70) with flow rate of 1.0 mL?min-1.The detection was performed at wavelength of 254 nm.Column temperature was room temperature and the injection volume was 10 ?L.RESULTS: The linear ranges of peoniflorin,calycosin and ferulic acid were 180～3 600 ?g?mL-1(r=0.999 2),4.6～92.0 ?g?mL-1(r=0.999 1) and 8.0～160.0 ?g?mL-1(r=0.999 4),respectively.The average recoveries were 98.3%(RSD=1.8%,n=9),99.0% (RSD=2.0%,n=9) and 100.5%(RSD=1.1%,n=9),respectively.CONCLUSION: The method is simple,accurate,sensitive and reproducible for the quality control of Kangmin granules.

Objective To approach the value of combination mode of different CT post-processing technique in diagnosing rib fine fracture.Methods 98 patients suspected with rib fractures underwent multislice spiral CT(MSCT) scanning,and CT features of rib fractures were observed with the combination of three different images:(A)volume rendering(VR),curved planar reformation(CPR) and axial view;(B)maximum intensity projection(MIP),CPR and sxial view;and(C) VR+MIP,CPR and axial view.The results were respectively recorded.Results 265 rib fine fractures were found among 98 patients.The detecting rate of fine fractures with C group was higher than that with A group (χ~2＝6.67,P＜0.01) and B group (χ~2＝6.75,P＜0.01).Conclusion MSCT four step observation method can improve the detecting rate of rib fine fracture,that is of important clinical value.

Objective To evaluate whether second-look endoscopy could prevent endoscopic submucosal dissection complicated with delayed bleeding and to clarify what kind of lesions that need second-look endoscopy. Methods 98 patients with early gastric cancer by histological diagnosis from Oct. 2014 to Sep. 2016 were included in this study. Mucosal damage related bleeding within 24 h after ESD was considered delayed bleeding. Clinical data of patients, lesions, surgical factors, and the incidences of bleeding before and after the second endoscopy examination were retrospectively studied. Results The en bloc resection rate of 98 patients was 100.0%, and all incisal margins were negative. No gastrointestinal perforation, death or severe complications occurred. 5.1%of the patients (5/98) occurred delayed bleeding after ESD and had been successfully stopped in a second-look endoscopy, and none received operations. No delayed bleeding occurred in follow-ups of patients with negative delayed bleeding. 40.0 % of the patients (2/5) with delayed bleeding received blood transfusion. The median time of second-look endoscopy after ESD was the second day after operation (1 ~ 3 d). The median bleeding time of 5 patients with delayed bleeding after ESD was the first day after operation (1 ~ 10 d). The median duration of surgery was 75 min (60~150 min), and the prediction success rate was 94.9 %. The results of univariate analysis showed that age [(69.6 ± 7.9) vs (60.9 ± 10.1) years old, P = 0.003] and operation time [(90.0 ± 41.0) vs (66.0 ± 42.0) min, P = 0.000] were both the risk factors in delayed bleeding and non-bleeding group. Binary Logistic regression analysis showed that operation time (OR^ =1.07; 95%CI:0.73 ~ 14.63, P = 0.010) was the only predictor of delayed bleeding after ESD. Conclusions Second-look endoscopy might be effective in preventing delayed bleeding after gastric ESD, especially within 48 hours after ESD. The operation time was an independent risk factor for delayed bleeding after gastric ESD.

Objective To establish a large animal ( sheep) model to serve the experiments of domestic pulsatile ventricular assist device.Methods Three small-tail Han-sheep were anesthetized and the vein access and artery access were achieved.The cardiopulmonary bypass was established through left thoracotomy.Ventricular fibrillation was induced. An hole was made in the apex of left ventricle and the apex cannulation was sutured to it.The aortic cannulation was su-tured to the descending aorta.The two cannulations were connected to the domestic pulsatile ventricular assist device ( DP-VAD) and the driver was turned on.The working of DPVAD and the conditions of the animals were observed.Results The DPVAD worked well and uni-directional blood flow was driven by positive and negative pressure.The left ventricle was unloaded and the blood pressure was raised up.Conclusion The establishment of sheep model of pulsatile ventrieular as-sist device may play important role for the research and development of DPVAD in our country.

Whennearinfraredspectroscopyisappliedtoon-linemonitoringandcontroloftobaccoflavors,the variation in temperature can severely deteriorate the predictive performance of near infrared spectroscopic calibration models and results in a significant increases of the root mean square error value for the main constituents in syrup samples from 2. 4% to 29. 0%. In this paper, near infrared spectroscopy has been incorporated with an advanced calibration transfer method-loading space standardization to effectively eliminate the deteriorate effects of temperature variation on quantitative results and finally realize the fast and accurate on-line quantitative monitoring and control of tobacco flavors. The root mean square error value for the main constituents in syrup samples is successfully retained at a satisfying low level of 3 . 8%. The results of this paper will provide technical support for the preparation, preservation and use of tobacco flavors, and realize on-line process quality control of cigarettes.