A novel method based on independent component analyzing (ICA) in frequency domain to distinguish the frequency characteristics of multi-sensor system is presented. The conditions of this type of ICA are considered and each step of resolving the problem is discussed. For a two gas sensor array, the frequency characteristics including amplitude-frequency and phase-frequency are recognized by this method, and cross-sensitivity between them is also eliminated. From the principle of similarity, the recognition mean square error is no more than 0.085.

Objective To investigate the effects of internal plating with high and low moduli of elasticity on the stress and its distribution on the femoral shaft fracture. Methods A femur from a normal Chinese adult male was scanned by 64-detector row helical CT at 0. 5 mm interval. The CT images were used to establish a finite element model of the femur by software. The mid-femoral fracture was simulated in the model and fixated by eight-hole plates of Ti-6Al-4V (high modulus group, E = 110 GPa) and of Ti2448 (low modulus group, E = 30 GPa). When the femur was in axial compression, flexion and torsion loads, the stress and its distribution on the bone fracture site were analyzed to compare the biomechanics of the plates with high and low moduli. Results Under axial compression load, the contact stress between fracture ends in the low modulus group was larger than that in the high modulus group, while the max stress at the hole (11.47MPa) was smaller than that in the high modulus group (13.89 MPa) . Under four-point bending load, the contact stress in the low modulus group was still larger, while the bending movement was smaller. Under the torsion load, stress on the femur was well-distributed in both groups, but the max stress at the hole in the low modulus group (11.47 MPa) was smaller than that in the high modulus group (31.24 MPa). Conclusions Under internal fixation by plates of low modulus, the stress stimulus at the fracture site may be increased,while the stress concentrated at the hole may be decreased. The stress shielding of the low modulus plate may also be modified.

Objective To explore the relationship among psychological satety climate,proactive personality and self-efficacy.Methods Psychological safety climate scale,proactive personality scale,and self-efficacy scale were used to investigate a total of 228 registered nurses from two tertiary hospitals of Tianjin City from October to December,2013.Results The average points of nurses psychological safety climate was (3.05±0.53),average points of proactive personality was (2.70±0.48),average points of self-efficacy was (2.74±0.45),all were in the medium level.Both psychological safety climate and proactive personality could positively influence nursing self-efficacy directly(r=0349～0.472,P ＜ 0.01),and psychological safety climate could also indirectly influence nursing self-efficacy through the mediation of proactive personality (3 decreased from 0.472 to 0.352,P ＜ 0.01).Conclusions Hospi-tal should make concerted efforts to improve psychological safety climate and proactive personality so as to in-crease nurses' self-efficacy.

The ascorbic acid in plasma was determined on the basis of reduction of ferric to ferrous ion and its formation of a colored complex with batho-phenanthroline. This method was highly correlated to Roe's dinitrophe-nylhydrazine method in the determination of plasma ascorbic acid of 16 normal adults and the correlation coefficient was 0.90. By animal experiment the new method may be used to discriminate different levels of plasma ascorbic acid. It is rather simple and water bath is not required. Only 0.25ml of plasma is needed for each determination. So this method is useful in assessing the ascorbic acid nutriture in tield survey.

Ninety rats were divided into 8 groups. Group 1-5 were fed vitamin A free ration and each group was divided into 2 subgroups at the beginning and 12, 23, 36, 43, days after the experiment respectively. Group 6-8 were fed the ration containing 66, 132, and 198?g vitamin A per 100g diet respectively fer 30 days, and each group was also divided into 2 subgroups. The results showed that RBPR% was better than the serum vitamin A content in evaluating vitamin A nutritional status. It was suggested that the vitamin A nutritional status could be graded as follows: deficient(abore 70%)) mar-ginal(60-70%),normal (20-60%), and sufficient (under 20%)by RBPR%.

An improved microfluorimetric method for determination of serum vitamin A was presented. In this method, the excitation wavelength 345nm and emission maximum 480nm were selected, and cyclohexane as solvent for extraction of saponified vitamin A in the serum samples to be tested was used. The sensitivity was sufficient for measurement of vitamin A content in 20*l serum taken from normal fasting blood without elimination of interference. The recovery averaged 99.0% (93.0-105.5).When this method was applied to laboratory study or field work, practically, the results showed that the values of vitamin A obtained seemed to correlate with its nutritional status of experimental animals or subjects investigated. The procedure was simple, reproducible and easily acceptable, espicially in the field work.

35 rats were divided into 5 groups. Group 1-3 were fed rations containing 20, 12 and 6% caseien respectively, group 4 containing 12% mixed protein of soybean and gluten. The food of group 5 was the same as that of group 1 but the amount was only half of that of group 1. Every animal was given 8?g vitamin A by stomach tube daily for 3 weeks and then 25?g for 2 weeks. Afterward serum vitamin A values were determined in all animals, then 132?g vitamin A was administrated by stomach tube. After 3.5 hours, the vitamin A values in serum and liver were determind. The results showed that in group 3 and 5 serum vitamin A contents decreased and the liver values rose. It was suggested that the release of vitamin A from liver had been interfered by semistarvation or low protein intake. There is no difference between group 2 and 4.

Based on the body height and weight of the Chinese young men, 975 from the north and 921 from the south of China, actually measured, a calculating formula for the ideal body weight of young men both of north and south listed blow was established. The Northener's ideal body weight (kg) = [height (cm) - 150] ? 0.6 +50; the Southener's ideal body weight(kg) = [height (cm.) - 150] ? 0.6 +48. The formula later checked by another data of body height and weight of 783 young men from north and 883 from south has been proved to be reliable. It also showed that the ideal body weight of 1464 young men from north and 2264 from south calculated according to the formula seemed to be more reasonable than the another's formula used previously.

Objective To evaluate the long-term clinical outcomes between laparoscopic gastrectomy and open gastrectomy with D2 lymph dissection for advanced gastric cancer.Methods Clinical studies that compared clinical outcomes of laparoscopic gastrectomy and open gastrectomy for advanced gastric cancer were searched from PubMed,EMBASE,Medline,Cochrane Library,WanFang,CNKI,CMCC and VIP database with the Gastric neoplasms Laparoscopy Gastrectomy Long-term outcomes Meta-analysis between Jan.2002 and Oct.2016.Data of long-term survival and recurrence were analyzed by using of RevMan 5.2 software.Survival data were present by the odds ratio(OR) and 95％ CI.The heterogeneity of the data was analyzed using the I2 test.Results Fifteen studies including 4,053 cases were enrolled.There were 2,091 patients in LG group and 1,962 patients in the open gastrectomy group.There was no significant difference in the 3-year overall survival rate(OR =1.00,95％ CI:0.83-1.20,P =0.98),5-year overall survival rate (OR =1.14,95％ CI:0.95-1.36,P =0.15),5-year disease-free survival rate(OR =1.13,95％ CI:0.93 ～ 1.39,P =0.22)and cancer recurrence rate (OR =0.96,95％ CI:0.79 ～ 1.18,P =0.71)between the patients treated with laparoscopic gastrectomy,or open gastrectomy (P ＞ 0.05).Conclusion Laparoscopic gastrectomy with D2 lymph dissection for advanced gastric cancer has similar long-term outcomes as compared to open gastrectomy.

Objective To investigate the operative techniques of microsurgery treatment of M1 segment of middle cerebral artery (MCA) aneurysms via pterional approach in 132 cases.Methods Retrospectively analyzed the clinical manifestation,angiograms,and surgical operation data of 132 patients with M1 segment of MCA aneurysms who underwent microsurgery through pterional approach.Results Preoperative digital subtraction angiography (DSA) was conducted in 121 cases to identify the size,shape,orientation and relationship with blood vessels around the MCA aneurysms.The other 11 cases underwent emergency operation.Among the 132 cases,72 patients were discharged in good condition according to Glasgow Outcome Scale; 41 patients were in poor condition; 19 cases were dead or in predying state.Postoperative CT showed that49 cases occurred new infarction and 7 cases developed hydrocephalus or enlargement of ventricles.Ventriculoperitoneal shunt was conducted in 2 cases.Intraoperation rupture and bleeding of aneurysms occurred in 17 cases.Conclusion The aneurysms in M1 segment of the middle cerebral artery are mostly located in the bifurcation of M1 segment.Most branches and perforating arteries stem from middle cerebral artery trunk.Patients with Hunt-hess grade Ⅰ-Ⅲ MCA aneurysms or with Hunt-hess grade Ⅳ,Ⅴ should be treated with microsurgery as soon as possible.Inside Sylvian fissure approach is the most frequently adopted in microsurgery via pterional approach.It is key for the success of the operation to preoperatively understand the anatomy surrounding the aneurysms,have good microsurgical skills and employ correct methods of preventing and managing of rupture of aneurysm.It can relieve the secondary cerebral vasospasm to clear up hematocele in the cisterns or to wash the cisterns or use adhesive wound dressing on blood vessels during operation using papaverine.