Objective:To explore the relation of mobile phone addiction to perceived social support and sub-jective well-being in college students. Methods:Totally 4000 college students were selected from 2 colleges,and they were assessed with the Mobile Phone Addiction Inventory (MPAI),Perceived Social Support Scale (PSSS) and subjective well-being scale (SWB). Results:The college students of mobile phone addiction were 1420 cases, accounting for 37. 9%. Except the dimension of negative emotion,the PSSS total scores and its factor scores,the SWB total scores and its factor scores were lower in the Mobile Phone Addiction (MPA)group than in the non-MPA group (Ps<0. 00 1 ). Regression analysis indicated significant negatively predictability of MPAI to subjective well-being and PSSS had significant positively predictability to SWB. The test of mediating effect found that PSSS and its 3 dimensions played a partly mediating role between MPAI and SWB,and the mediation effect account for the total effect 24. 89%,16. 1 1%,17. 33%,17. 78% respectively. Conclusion:There may be a close relation of mobile phone addiction to perceived social support and subjective well-being. Mobile phone addiction could directly affect subjective well-being and indirectly affect subjective well-being through perceived social support.

Purpose: To understand the influence to depth doses and peripheral doses by Enhanced Dynamic Wedge and physical wedge.Methods: The depth doses and peripheral doses were measurement for open field and Enhanced Dynamic Wedge field as well as physical wedge.Results: ⑴ depth doses and peripheral doses for Enhanced Dynamic Wedge fields was very similar to those for open fields ⑵ depth doses and peripheral doses for physical wedge fields was large than those for open fields. Conclusion: depth doses measured for open fields can also be used for Enhanced Dynamic Wedge fields dose calculation. Wedge depth dose must be used in the physical wedge fields dose calculation. It should be pay attend to peripheral doses for physical wedge fields in the clinic.

Objective To study the changes of NO plasma levels in patient with ischemic stroke(IS) of different types.Methods Using HNO 3 deoxidize enzyme method, we examined the levels of plasma NO in 230 patients with cerebral infarction, 103 patients with lacular cerebral infarction and 169 normal controls.Results In cerebral infarction group, the level of plasma NO was significant higher than the two other groups ( P

BACKGROUND: High-strength titanium alloy can be prepared bY using powder metallurgy technique, but there are still some problems such as containing toxic elements or high elastic modulus in prepared alloys.OBJECTIVE: A new Ti-Mg alloy with non-toxic and elastic modulus which is close to human bones and strengths satisfy the requirements for human body implants was successfully prepared by means of powder metallurgy technology, and the effects of magnesium content on the microstructure and mechanical properties of Ti-Mg alloy were systematically studied.METHODS: The Mg powder and 17 powder in different mass ratios were prepared by powder metallurgy process to get a new integrated medical Ti-Mg alloy with excellent comprehensive properties. The porosity, fracture surface morphology and phase constituents of samples were observed by optical microscopy, scanning electron microscopy and X-ray diffraction, and the mechanical properties including bending strength, impact toughness and hardness of the alloys were measured,RESULTS AND CONCLUSION: Magnesium mass increasing firstly decreased and then increased admissible strain. When magnesium mass was 10%, admissible strain was 0.97%, which was highly closed to 0.67% of cortical bone. The porosity decreased from 18.3% to 3.8%, the holes became more tact and distributes more uniform, with the increased of mass ratio of magnesium. And with the increased of mass ratio of magnesium, the hardness, bending strength and elastic modulus of alloys with similar pattern of change, there were little changed when the mass fraction of magnesium less than 10%, they decreased significantly and then tended to stable with the continued to increased of magnesium mass fraction. While the admissible strain firstly decreased and then increased, with the increased of the mass fraction of magnesium. When the mass fraction of magnesium was 10%, the hardness, bending strength, impact toughness satisfied the mechanical requirements for human body implants, and the bending strength and admissible strain were close to human bones, which indicated well biomechanical compatibility.

Objective:To evaluate the safety of the combination of cefotiam sodium and furosemide and to provide the reference for clinical medication. Methods:Three groups were established, including the blank control group, cefotiam sodium group at the dosage of 500 mg·kg-1 ·d-1 , cefotiam sodium combined with furosemide group at the respective dosage of 500 mg·kg-1 ·d-1 and 15 mg ·kg-1 ·d-1 . After the continuous administration for 12 days, the renal structure, serum uric acid, creatinine and urea nitrogen, u-rine of α1 microglobulin and β2 microglobulin in the rats were detected. Results:Cefotiam sodium at the dosage of 500 mg·kg-1 · d-1 showed no significant effects on the renal structure, serum uric acid, creatinine and urea nitrogen,urineα1 microglobulin andβ2 microglobulin in the rats. The combination group showed significantly increased urine β2 microglobulin (P<0. 05) and significantly decreased serum uric acid (P<0. 05). Conclusion:Short time use of cefotiam sodium exhibits no significant effect on the renal struc-ture and function in rats, while the combination of cefotiam sodium and furosemide has significant effects on urineβ2 microglobulin and serum uric acid in rats.

Objective To investigate the clinical application of radionuclide pulmonary V/Q scan in the diagnosis,evaluation of the severity and prognosis of pediatric patients with bronchiolitis obliterans (BO).Methods From February 2005 to April 2011,30 BO pediatric patients (18 males,12 females,age range:7 months-14 years) were prospectively recruited for radionuclide pulmonary V/Q scan.The relationship between the radionuclide pulmonary V/Q scan and clinical presentations was analyzed.Results Perfusion defects were seen in 25 cases (83.3％) and ventilation defects in 27 cases(90.0％).Among the 27patients with abnormal V/Q scan,matched abnormalities were seen in 13 cases (48.1％),mismatched in 1 case (3.7％) and reverse mismatched in 13 cases (48.1％).Of the 3 patients with mild disease,1 had normal V/Q scan while 2 showed V/Q defect in 1 segment.In the 10 patients with moderate disease,the mean number of segments having perfusion and ventilation defects was 3.7 and 5.6,respectively.In the 17 patients with severe disease,the mean number of segments having perfusion and ventilation defects was 6.0 and 8.2,respectively.During follow-up,all 8 patients with progressive disease presented with severe impairment of pulmonary perfusion and ventilation;while the 16 patients with improvement had mild impairment of pulmonary perfusion and ventilation or normal V/Q scan.Conclusion Radionuclide pulmonary V/Q scan is valuable for diagnosis,evaluation of the disease severity,and prognosis in pediatric patients with BO.

The arteries of the foot in one hundred Chinese adult specimens were dissected and examined. 1. The dorsalis pedis artery was absent in 4%, and it originated from an abnormal origin in 5%, its course and relationship with the tendon of the extensor hallucis longus and deep peroneal nerve were also described. 2. The anterior medial and anterior lateral malleolar arteries originated more commonly at the level of the ankle joint, and sometimes they may originate from the dorsalis pedis artery. 3. The origin and number of the medial tarsal artery were variable, but that of the lateral tarsal artery were more constant. 4. The arcuate artery was present in 35%, but only 17% was typical in form, from which the 2nd-4th dorsal metatarsal arteries were giving off. 5. The sources of the dorsal metatarsal arteries were the most variable. The first dorsal metatarsal arteries which arose from dorsal or plantar aspect were similar in percentages. The 2nd-4th dorsal metatarsal arteries often originated from the plantar aspect, but it was not uncommon that they came equally from dorsal and plantar aspects. 6. The artery of the tarsal sinus was usually present, it may be divided into two categories, namely the proximal and the distal artery, with their distinct origins and courses. 7. The arterial trunks in the sole of the foot were more constant. The posterior tibial artery usually branched into its two main branches near the lower border of the laciniate ligament. 8. The lateral plantar artery was greater than the medial in 82%. And 71% of the plantar arch was formed chiefly by the deep plantar branch of the dorsalis pedis artery. 9. The plantar metatarsal arteries originated usually from the plantar arch, sometimes the neighbouring arteries may have a common trunk. The course of the Ist-3rd plantar metatarsal arteries was constant, but that of the 4th may be variable. Finally, some questions about the arteries of the foot, present in previous literatures, were briefly discussed.

The facial, retromandibular and external jugular veins of the neck were studied in a total of 230 Chinese cadavers.1. The external jugular vein can be divided into six types and fourteen subtypes. Type Ⅰ(40.22％) and type Ⅲ (29.13％) occurred more frequently in this series.2. The facial vein drains into the external jugular vein in 41.09％. It drains directly or indirectly into the internal jugular vein in 43.91％.3. The anterior branch of the retromandibular vein usually drains into the internal jugular vein and it runs through the space deep to the posterior, belly of the digastric and the stylohyoid muscles in 83.70％.4. The presence of the so called common facial vein occurred only in 29.13％.5. The external jugular vein often drains into the subclavian vein. It appears in 46.57％ in our observation.6. The external jugular vein crosses the inferior belly of the omohyoid muscle, when it runs downwards in the lower part of the external cervical triangle. It usually lies superficial to the omohyoid in 66.16％, deep to it in 26.35％.

Purpose: To analyses the variation regularity of output factor of lead block fields for high energy electron beam of Varian 2300 C/D linear accelerator. Methods: Output factors of lead block fields were measured for four standard applicators under various electron beam energy. Results: The variations of output factor with field side or with applicators size were no obvious regularity Output factor of lead block fields was related to standard applicators size and lead block fields side Output factor of lead block fields was related to electron beam energy. Conclusion: Electron beam energy, standard applicator size and lead block fields side had a obvious influence upon output factor. The accurate measurement should be performed for use electron beam energy in the clinic.

Aim To observe the effects of pituitrin ad- ministrated intravenously on electrocardiogram (ECG), and the effects of taurine on the ECG changes induced by pituitrin in conscious unrestrained rats. Methods ECG(leadⅡ)was recorded telemetrically and analyzed with Data Science International (DSI, USA); the changes of the ECG T wave and the heart rate at different times after the intravenous(iv) injection of pituitrin with or without intraperitoneal (ip) pre-administration of taurine were observed and calculated. Results ① Pituitrin 0.25～4.0 U?kg -1 dose-dependently elevated the ECG T wave; the T wave values were increased 0.75～3.42 times over the values before pituitrin, and the maximal effect appeared at 15 s after the injection. ② TAU 100, 200 or 400 mg?kg -1,injected intraperitoneally 30 min before the pituitrin, inhibited the T wave elevation and heart rate decrease induced by intravenous injection of pituitrin; compared with NS+pituitrin group, T wave elevation(mV) was decreased from 1.77?0.165 to 1.60?0.13(P