Based on the theory of random vibration and system identification,ambient vibration tests of three wind turbine towers in wind-power station of Inner Mongolia Wulanyiligeng were carried out.The method of coupling overall modeling of blade,hub,nacelle and tower was put forward,and the numerical stimulation and tests results showed that the wind turbine towers can effectively avoid resonance,and meet the standard design requirements of Germanischer Lloyd;the vibrational forms of the wind turbine towers mainly are lateral bending vibration,forth-and-back bending vibration and torsional vibration;the translational damping ratio in the first mode is about 1.75%,and the torsional damping ratio in the first mode about 0.6%.The overall modeling showed excellent consistency with the test results,it could benefit wind-induced dynamic response analysis and vibration control analysis of wind turbine tower systems.
The hot deformation behavior and microstructure of Fe-12.5Cr-4Al-2Mo-0.03Nb-0.08Y alloy were studied under conditions of 800 °C~1200 °C/0.01 s-1~10 s-1 using a combination of hot compression experiments, EBSD and TEM characterization. The results indicate that the deformation temperature and strain rate have a significant impact on the flow stress and microstructure of the alloy, especially the deformation temperature. The constitutive equation constructed in this paper can reflect the hot deformation process and accurately calculate flow stress value of the FeCrAl alloy in corresponding states. The FeCrAl alloy undergoes DRV and DRX during hot deformation. DDRX grains distributed along the original grain boundaries mainly formed at low deformation temperatures and high strain rates, while CDRX grains mainly formed at high deformation temperatures and low strain rates and characterized by the internal distribution of the original grains. Moreover, the orientation of DDRX grains is mostly different from that of adjacent original grains, while the orientation of CDRX grains is relatively close to that of the original grains.
Metastasis in penile corpus cavernosum from adenocarcinoma of lung is a rare but fatal disease, which was reported in cases without series studies. It causes various clinical symptoms seriously affecting the quality of life. A 72-year-old male smoker patient, who had a history of adenocarcinoma of lung after targeted therapy 36 months before, was admitted to Jiangxi Cancer Hospital because of presenting with aggressive dysuria and penis pain for one hour. A Foley catheter was inserted into the patient's bladder with difficulty. Immediately do a bladder puncture. Emergency pelvic computed tomography (CT): a soft tissue nodule of 1.1 cm×1.4 cm was found in the cavernous area of the middle part of the penis, and the proximal urethra was dilated with a wide diameter of about 1.5 cm. The diagnosis of metastatic lung adenocarcinoma from the primary was made by CT-guided biopsy. The penis may be a site of metastasis from primary lung cancer, especially for old patient. Metastasis to the penis usually indicates that the primary lung cancer is at an advanced stage and the prognosis is very poor. More research is necessary to understand the underlying mechanism of adenocarcinoma of lung metastasis.
Timber residence is a kind of green construction and has been widely used in western countries. This paper presents the situation of the construction of rural residence in China, and investigates the architectural features and construction requirements of rural timber residence in developed countries such as the United States, Canada, Italy, Finland and Japan. Combined with the application status of timber residence in China and foreign experience in the construction of rural timber residence, some advice for the future development of China's new rural construction is raised. Research results show that although timber residence was widely used in China in history, people have a skeptical attitude towards it due to the defects in design and construction management, and related research for timber residence is relatively few at this stage in China; While timber residence is one of the main structural form in developed countries for rural residence, and its successful application can provide enlightenment and help for China.
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