An angular speed, acceleration and tangential leakage of a synchronal rotary compressor in which both bladed rotor and a cylinder are discussed. The calculation formulae of revolving speed of cylinder and relative speed between the cylinder and bladed rotor are deduced detailedly in this paper. The variation of tangential speed and cylinder acceleration with angular position is investigated for a complete cycle. And some key parameters affected the relative speed are found out, viz, the relative speed depends on the radius of the cylinder and rotary speed of the axis, and the ratio of the cylinder to bladed rotor has not too much influence. It is the theoretic basis of designing and optimizing of structure characteristic of a synchronal rotary compressor. Also a computing formula of leakage related with rotary speed is deduced. It could supply

Objective To study the relationship between homocysteine (Hcy)and carotid atherosclerosis in patients with cer-ebral infarction.Methods During January and November 2013,281 patients with cerebral infarction from Affiliated Hospital of Yan’an University were provided the blood samples as cerebral infarction group,140 healthy volunteers served as control group.Serum Hcy was detected by enzymatic cycle assay.According to the results of carotid artery ultrasonography,cerebral infarction group was divided into five groups:artery normal group,intimal thickening group,soft plaque group,mixed plaque group and hard plaque group.The statistically significance was analyzed by SPSS 19.0.Results The serum Hcy level of cer-ebral infarction group was 19.78 ± 5.21 μmol/L,significantly higher than the control group 10.24 ± 3.33 μmol/L (P <0.001).The serum Hcy levels of control group,artery normal group,intimal thickening group,soft plaque group,mixed plaque group and hard plaque group were 10.24±3.33,15.20±2.99,17.03±1.85,25.44±4.24,19.65±4.74 and 18.31 ±3.67 μmol/L respectively.The differences between groups were statistically significant in addition to intimal thickening group and hard plaque group (P =1.106).The positive rates were 16.4%,53.7%,87.1%,95.7%,83.1% and 77.3% re-spectively,the groups which in cerebral infarction group compared with control group,the differences were statistically sig-nificant (P <0.001).Conclusion Hcy played an important role in the occurrence and development of cerebral infarction. Lower serum Hcy concentration,may be an effective way to prevent carotid atherosclerosis and cerebral infarction.

Objective To evaluate the early appearance of SARS on chest CT scan and its role in the early diagnosis Methods Forty cases of SARS in keeping with the criteria of the Ministry of Health had chest CT scans within 7 days of onset of symptoms, and CR chest X-ray films were available as well These chest X-rays and CT images were retrospectively reviewed to determine if there were any abnormalities on the images The lesions on the chest CT images were then further analyzed in terms of the number, location, size, and density Results Positive abnormalities on chest CT scans were revealed in all 40 SARS cases Positive findings on CR chest films were showed in only 25 cases, equivocal in 6, and normal in 9 cases The main abnormalities seen on CT and X-rays were pulmonary infiltrations varied markedly in severity 70% cases had 1 or 2 lesions on chest CT scan, 30% cases had 3 or more lesions The lesions seen on chest CT scan tended to be ground-glass opacification, sometimes with consolidation which was very faint and inhomogeneous, easily missed on chest X-rays Typically the lesions were located in the periphery of the lung, or both central and peripheral lung, but very rare in a pure central location They were commonly in the shape of patch or ball Conclusions Chest CT scan is much more sensitive in detecting the lesions of the lung in SARS The early appearance of SARS on chest CT scan is characteristic but non-specific, indicating that chest CT scan plays a very important role in the early diagnosis and differential diagnosis of SARS

Objective To analyze the imaging findings of osteosarcomatosis, and to explore the value of imaging in the diagnosis of osteosarcomatosis.Methods Clinical data and imaging findings in 15 cases of osteosarcomatosis were reviewed.All of them had conventional X-ray films, 13 cases had CT scanning, 11 cases had ECT scanning, 5 cases had MR scanning, and 4 cases with DSA.Results Eight primary lesions were located in the distal femur, 5 in the proximal tibia, 1 in humerus, and 1 in clavicle.Secondary lesions were scattered in proximal tibia in 8, distal femur in 6, spine in 6, pelvis in 2, and other sites.The primary lesion showed typical X-ray finding of osteosarcoma, but lesions at other position showed mainly high density of osteogenesis in all 15 cases.In 13 cases, CT played an important role in defining the extent of the tumor and soft tissue masses.CT scanning was sensitive in detecting osteosclerotic lesions in the bone marrow.In 5 cases, MRI was useful in delineating the extent of tumor and soft tissues mass, as well as the extent of tumor in bone marrow.ECT had the capacity of showing the radionuclide concentration of tumor focus in the whole body in a single scan in 11 patients.Conclusion Osteosarcomatosis has multiple lesions all over the body.Imaging modalities including X-ray plain film, CT, MRI, and ECT are all important in finding the lesions and in diagnosing osteosarcomatosis.

ificantly lower than in both middle and low group(P＜0.05).Conclusion TP may improve the antioxidant ability of experimental aging mice.

Background Intracameral or intracorneal administration of amphotericin B (AMB) can achieve significant therapeutic efficacy in the treatment of recalcitrant fungal keratitis in cases that do not respond to conventional antifungal therapy. However, the ocular pharmacokinetics of the two routes of administration is unclear.Objective The goal of this study was to investigate the level of amphotericin B in cornea and aqueous humor of rabbits after administration of AMB via three different routes. Methods Forty-five healthy domestic rabbits were randomly divided into three groups. 1% amphotericin B of 10 μg was intrastromally or intracamerally injected into 15 rabbits, respectively,in group A and group B. Topical 0. 25% amphotericin B was topically administered to the eyes with corneal epithelial debridement (group C). Experimental animals were sacrificed and the corneas and aqueous humor samples were obtained for the detection of levels of amphotericin B at 30 minutes,6 hours, 1 day,3 and 7 days by high-performance liquid chromatography (HPLC). Results Calibration curves were linear over the range of 0. 10-100. 00 mg/L. The concentration of 0. 10 mg/L was the lowest quantifiable limit. The recovery of amphotericin B ranged from 89. 1% -95.7% from aqueous humor samples and 81.4% -83.6% from the cornea samples. After a single injection,effective drug levels were achieved and maintained for 7 days in cornea in group A, exceeding the minimum inhibitory concentration at which 90% of isolates are inhibited (MIC90) for a wide spectrum of fungi and molds with significant differences in comparison with group B and group C ( P＜0. 05 ). Effective drug levels were achieved in the aqueous humor in group B at 30 minutes after a single injection, but drug levels decreased dramatically within 6 hours. The evident differences were found between group B and group A or group C (P＜ 0.05). A considerable amount of amphotericin B was detected in the cornea and aqueous humor in group C within 1 day.Conclusion Effective high drug levels can be reached in rabbit cornea and aqueous humor after intrastromal and intracameral injection, respectively. Penetration of topical amphotericin B was greatly elevated after epithelial debridement.

Objective To study the therapeutic effects of human umbilical cord mesenchymal stem cells (hUCMSCs) on acute liver failure ( ALF) induced by D-galactosamine (D-gal) and lipopolysaccharide (LPS) in rats. Methods The ALF model was obtained through intraperitoneal injection of D-gal(300 mg/kg)and LPS (20μg/kg)in Wister rats. The hUCMSCs were transplanted after intoxication. All rats were divided into four groups, and each group received either hUCMSCs or 0.9% NaCl solution through intraperitoneal or tail-intravenous injection. To evaluate the liver function of each group, the levels of alanine aminotransferase (ALT), total bilirubin (TBil) and serum albumin (Alb) were measured on the day of hUCMSCs transplantation and the following 1, 2, 3, 5 and 7 days. All rats were then sacrificed to examine the liver histology at day 7. Analyses were done by using Fisher's exact test, unpaired t test and Mann-Whitney U test. Results There were no significant differences of survival rates among four groups (Fisher's exact test, both P = 1. 00). The levels of ALT, TBil and Alb in group receiving hUCMSCs intraperitoneally were (804. 9 ± 88. 0) U/L,(17. 4±2. 7) μmol/L and (20. 9±0. 8) g/L, respectively after 2 days of injection, whereas in the corresponding control group, those were (1294. 3± 171. 4) U/L, (32. 3±5. 5) μmol/L and (16. 1±0. 9) g/L, respectively, which indicated that hUCMSCs transplantation significantly improved the liver function (t = 2. 640, P =0.020;t=2.529, P = 0. 025;t= - 3. 833, P = 0. 002). Both of hUCMSCs-transplanted groups showed no significant differences. Liver histological data showed that transplantation of hUSMSCs through either intraperitoneal or tail-intravenous injection alleviated liver damage (U=4. 500, P = 0. 005;U=4. 500, P = 0. 008) and the mitotic index also increased in hUCMSCs-transplanted groups (U=4. 000, P = 0. 005; U=5. 500, P = 0. 013). Conclusions The levels of ALT, TBil and Alb can rapidly normalize in ALF rats after injected with hUCMSCs either intraperitoneally or tail-intravenously. hUCMSCs application raises the mitotic index, enhances hepatocellular regeneration and improves histological status.

Objective To evaluate the changes of peripheral blood interleukin(IL) 2, IL 10, IL 13 in the serum of asthmatic children and their effect on the pathogenesis of asthma.Method The serum levels of IL 2,IL 10,II 13 in 16 cases of asthmatic children and 10 cases of healthy controls were measured by ELISA methods.Results The serum levels of IL 2,IL 13 in asthmatic patients were significantly higher than those in healthy controls( P

ObjectiveTo evaluate the effect of Bone mesenchymal stem cells(BMSCs) intraarticular injection on the pathological development of collagen-induced arthritis(CIA) rats.MethodsCIA Wistar rats were divided into 2 groups:the saline injection control group and the BMSCs injection group.BMSCs were isolated from normal rats and cultured in vitro till P2 generation,which were injected into the affected the ankle joint consequently.After 2,4,8,12 weeks of processing,the following indexes were observed:arthritis score and X-ray.Twelve weeks later,all of the rats were sacrificed and the following histological indexes were evaluated:cartilage destruction and cartilage extracellular matrix secretion.Paired samples t-test was used for the statistical comparison.ResultsAll the arthritis indexes of the BMSCs group were much lower.than those of the saline control group.The arthritis scores were 3.18±0.62 vs 3.84±0.35 (at week 2),3.45±0.28 vs 5.96±0.48(at week 4),3.86±0.23 vs 6.75±0.36(at week 8),4.23±0.43 vs 7.86±0.66 (at week 12) respectively.X-ray scores were 2.04±0.21 vs 2.72±0.15(at week 2),2.52±0.47 vs 4.06±0.38 (atweek 4),3.56±0.29 vs 4.35±0.36 (at week 8),3.73±0.43 vs 4.86±0.62(at weekl2) respectively and the histological evaluation indexes were 2.34±0.22 vs 3.52±0.55 (at week 12).ConclusionBMSCs injection may inhibit the pathological development of CIA rats,and it may be a promising approach for the treatment of rheumatoid arthritis.

OBJECTIVETo compare clinical effects between bridge wire splint fixation and traditional Bryant traction for the treatment of femoral shaft fractures in children.

METHODSFrom June 2006 to June 2009,38 children with femoral shaft fractures were treated with bridge wire splint fixation and Bryant traction. In bridge wire splint group, there were 15 males and 6 females, ranging in age from 8 months to 5.3 years, with an average of (2.3 +/- 0.6) years. According to fracture site classification, 5 patients were upper 1/3 femoral fractures, 9 patients were middle 1/3 femoral fractures,and 7 patients were lower 1/3 femoral fractures. In Bryant traction group,there were 10 males and 7 females, ranging in age from 10 months to 3.2 years, with an average of (2.2 +/- 0.4) years. According to fracture site classification, 4 cases were upper 1/3 femoral fractures, 10 patients were middle 1/3 femoral fractures, 3 patients were lower 1/3 femoral fractures. The clinical features, X-ray healing time,weight-bearing time and complications of the two groups were compared.

RESULTSComparison of fracture healing time: bridge wire splint group was (6.0 +/- 0.3) weeks and Bryant traction group was (6.2 +/- 0.4) weeks; the time of weight-bearing in bridge wire splint group was (6.1 +/- 1.0) weeks and in Bryant traction group was (6.4 +/- 1.2) weeks; there was no significant difference between two groups. There was a significant difference in soft tissue complication between bridge wire splint group occurred in 3 cases and 13 cases in Bryant traction group. According to the criteria of clinical efficacy,in Bryant traction group, 12 patients got an excellent result, 4 good and 1 fair; in bridge wire splint group, the data were 17, 3 and 1 respectively,and there was no significant difference between the two groups.

CONCLUSIONBoth of bridge wire splint fixation and traditional Bryant traction for the treatment of femoral shaft fractures in children have good efficacy. Compared with Bryant traction,bridge wire splint fixation is simple, safe and has reliable effect.

Child, Preschool ; Female ; Femur ; diagnostic imaging ; injuries ; physiopathology ; surgery ; Fracture Fixation ; adverse effects ; instrumentation ; Fractures, Bone ; diagnostic imaging ; physiopathology ; surgery ; Humans ; Infant ; Male ; Postoperative Complications ; Splints ; Time Factors ; Tomography, X-Ray Computed ; Traction ; methods ; Treatment Outcome ; Weight-Bearing