In this paper, we studied the wing root pivot joint's radial load of a submersible airplane which imitates the locomotion of gannet's Morus plunge-diving, by implementing a test device name Mimic-Gannet. The housing of the device was designed by mimicking the morphology of a living gannet, and the folding wings were realized by the mechanism of variable swept back wing. Then, the radial loads of the wing root were obtained under the conditions of different dropping heights, different sweptback angles and different water-entry inclination angles(i.e., the angle between the longitudinal body axis and the water surface), and the relationships between the peak radial load and the above three parameters were analyzed and discussed re- spectively. In the studied areas, the minimum peak radial load of the pivot joint is 50.93 N, while the maximum reaches up to 1135.00 N. The largest peak load would be generated for the situation of vertical water entry and zero wing sweptback angle. And it is of great significance to choose the three parameters properly to reduce the pivot joint's radial load, i.e., larger wing sweptback angle, smaller dropping height and water-entry inclination angle. It is also concluded that the peak radial load on the wing root is closely linear with the water-entry dropping height and the wing sweptback angle with a significant correlation. Eventually, the relationship between the wing load and the dropping height, water-entry inclination angle or wing sweptback angle, could be used to calculate the wing load about plunge-diving of a submersible aircraft, and the conclusions reveal the wing load characteristic of the gannet's plunge process for the biologists.
This paper is mainly talking about the recognition of the pulse wave’s extreme point,and puts forward a new algo rithm based on the extreme point of the second derivative which corresponds to the inflection point of the original pulse wave,It elaborates the algorithm principle and compares the new algorithm and the traditional extreme value method for the original wave.The practice has proved that the new is more accurate and its error is smaller.
The article first discusses the contents, methods and tools of personnel assessment, then points out some deficiencies in personnel assessment, and finally suggests that it should be necessary to work on studying the systems of psychological assessment between personnel and computer.
The problems of asymmetric information are pervasive in the economic activities.Based on principal-agent theory,the writer makes a systematic study and analysis on the asymmetric information problem in technology contract so as to understand the content and the features of asymmetric information in technology transaction,to provide the essential theoretical basis for the parsing technique transaction's market organization behavior,and to offer rationale for the effective realization of technology transaction.
Online dosimetry plays an important role in radiotherapy quality assurance(QA) and quality control(QC). This study is to explore the use of semiconductor dosimeter for dose verification during whole body irradiation.
Objective To explore the causes and characteristics of an influenza A(H1N1)outbreak in a college of Guangxi and provide scientific evidence for the disease control and prevention.Methods Field epidemiologic investigations were done among population in the college and pharyngeal swabs were tested to confirm influenza A(H1N1) infection.Results 98.7%(male 62.9%,female 37.1%) of the influenza A cases were new-enrolled students,who joined the college from 18 provinces.The incidence rates were 14.0% and 1.7% for new-enrolled and the other students respectively.The incidence rates of cases were ranged from 6% to 75%(average 37%)for students with close contact with influenza patients.The viral nucleic acid were tested positive in 7-15 days following the onset of illness.All patients showed only mild symptoms and recovered after appropriate medication or rest.The outbreak was over in 7 days after implementing isolation and the other intervention measures.Conclusion The risk of influenza came from close contact with patients.The isolation of patients and the prevention of transmission were efficient in the control of influenza outbreak.
Objective To discuss the relationship between pre - operative complication of children's traumatic cataract and prognosis after intraocular lens implantation.Methods 131 cases (eyes) of children's traumatic cataract that had received intraocular lens implantation were observed . Follow - up was from 2 to 32 months. Results Corrected visual acuity 3≥0.05 in 104 eyes (86.67% ), ≥0.3 in 75 eyes (62.5%) ,≥ 0.5 in 43 eyes (35 .8% ) .We compared the rate of visual acuity rehabilitation and the condition that weather per - operative complication exist or not with single - item x2 test,there was no different (P 0.05) . We also compared the amount of pre - operative complication and the rate of visual acuity rehabilitation, the result showed difference ( P 0.01). The more pre - operative complications existed, the lower rate of visual acuity rehabilitation was met. Conclusion The rate of visual acuity rehabilitation is obvious relate to the amount of pre - operative complication, the condition that whether it exists or not is not the major factor to the rate of visual acuity rehabilitation.
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