支承对传动轴系稳态不平衡响应的影响研究

推导了基于经典梁的传递矩阵,用传递矩阵法分析了直升机水平传动轴的稳态不平衡响应。研究了粘弹性减振器的刚度和阻尼对水平传动轴系各元件一阶共振峰值的影响。结果表明,降低支承刚度,轴段的一阶共振峰值减小,支承处的振幅增大;增加支承阻尼,轴系中各元件的一阶共振峰值减小。减振器不仅提高了传动轴系的安全裕度,还减小了轴系的一阶共振峰值。     

潮下砂坪上泥炭沼泽的形成条件及发育特征山西岩溶陷落柱的岩体力学背景

用沉积地质学的研究方法对内蒙古乌达矿区晚古生代太原组１５号煤层下含煤岩系的岩石学特征、沉积层序和展布格局进行了详细研究,认为１５号煤层堆积于潮下砂坪沉积环境．对煤层本身的分布和煤岩学、煤质特征研究结果表明,该煤层的厚度分布稳定,与正常海相形成的煤相比该煤层中硫分偏低,惰性组分和矿物含量高,活性组分较低,并含有火山灰夹矸．因此可以推测,１５号煤层是在一种剧烈的地壳抬升作用下,由于海水迅速退出本区使潮下砂坪沼泽化而形成的．     

计算选煤产品实际产率格式法的修正

为了进一步提高格式公式法计算选煤产品实际产率的准确性 ,引入煤炭分选前后数质量平衡关系 ,对格式公式法进行修正 ;修正后的方法只需用复杂公式计算精煤产率即可 ,而不需要计算其他产率     

Ultrafast-laser-treated poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) electrodes with enhanced conductivity and transparency for semitransparent perovskite solar cells

Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is an important organic electrode for solution-processed low-cost electronic devices. However, it requires doping and post-solvent treatment to improve its conductivity, and the chemicals used for such treatments may affect the device fabrication process. In this study, we developed a novel route for exploiting ultrafast lasers (femtosecond and picosecond laser) to simultaneously enhance the conductivity and transparency of PEDOT:PSS films and fabricate patterned solution-processed electrodes for electronic devices. The conductivity of the PEDOT:PSS film was improved by three orders of magnitude (from 3.1 to 1024 S·cm^–1), and high transparency of up to 88.5% (average visible transmittance, AVT) was achieved. Raman and depth-profiling X-ray photoelectron spectroscopy revealed that the oxidation level of PEDOT was enhanced, thereby increasing the carrier concentration. The surface PSS content also decreased, which is beneficial to the carrier mobility, resulting in significantly enhanced electrical conductivity. Further, we fabricated semitransparent perovskite solar cells using the as-made PEDOT:PSS as the transparent top electrodes, and a power conversion efficiency of 7.39% was achieved with 22.63% AVT. Thus, the proposed route for synthesizing conductive and transparent electrodes is promising for vacuum and doping-free electronics.     

A comparative study of epoxy and polyurethane based coatings containing polyaniline-DBSA pigments for corrosion protection on mild steel

Organic coatings based on epoxy and polyurethane matrices containing polyaniline doped with dodecyl benzene sulfonic acid (Pani-DBSA) were prepared and applied over steel plates (SAE 1020). The plates were submitted to salt spray chamber for up to 30 days in order to evaluate the corrosion protection of these coatings. The properties of the coated plates were analyzed as a function of time by electrochemical impedance spectroscopy, open circuit potential, optical microscopy, and Raman spectroscopy. In general, results indicate a decrease in the electrical resistance, increase in capacitance and decrease in open circuit potential. Epoxy based coatings have improved performance when Pani-DBSA is used as pigment, whereas for the polyurethane coatings, Pani-DBSA seems to play an adverse effect. Raman spectroscopy indicates a possible chlorination of the epoxy matrix after 30 days exposure to salt spray chamber.     

TDI双管板换热器制造质量的控制简

介绍了TDI双管板换热器的结构特点和深孔强度胀接技术。简述了制造过程中的质量控制关键点。通过用模拟管板进行了内管板胀接工艺评定的方法,采取了控制管孔加工精度、强度胀接、管板组装、调整开槽间距及宽度、安排合理的胀接焊接次序、选择合适的胀接压力等措施;采用了新的检验和检测技术,保证了产品质量;增设了压力传感器,完善了安全监测系统。     

Influence of chemical structure of hardener on mechanical and adhesive properties of epoxy polymers

The mechanical and adhesive properties of epoxy formulations based on diglycidyl ether of bisphenol A cured with various aliphatic amines were evaluated in the glass state. Impact and uniaxial compression tests were used to determine the impact energy, elastic modulus and yield stress, respectively. The adhesion tests were carried out in steel–steel joints using single‐lap shear, T‐peel, and impact adhesive joints geometry. The better mechanical and adhesive behavior of the networks is obtained when exists high flexibility of chain between crosslink and/or high elastic modulus. The 1‐(2‐aminoethyl)piperazine epoxy network presents the best adhesive properties, high flexibility, and the largest impact energy. However, it possesses low elastic modulus and yield stress. Also, exhibits increases in peel strength and impact energy while reductions in lap shear strength. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

挥发份燃烧生成NO的试验研究

对铜川贫煤进行了挥发份析出和燃烧试验。通过测取和分析挥发份燃烧后烟气中NO，对铜川贫煤挥发份中氮的赋存及迁移规律进行了探索和研究，研究表明，铜川煤的挥发份中氮的赋存形态至少为2种，随着挥发份燃烧温度的升高，NO浓度峰值的出现时间的向前移动，挥发份燃烧温度上升到1673K以后，虽然有利于热力型NO的生成，但对燃料型NO的形成有一定的抑制作用，研究结果为进一步完善煤燃烧理论，有效控制煤燃烧过程中氮氧化物的生成提供了必要的理论基础。     

高抗热震性红外辐射涂料的实验研究

针对红外辐射涂料在工业炉不同基体表面上应用时出现的涂层易脱落问题,以过滤金属氧化物为红外辐射涂料的辐射基料、复合硅溶胶为涂料载体粘结剂主要成分,进行了高抗热震性红外辐射涂料的实验研究,并在热处理电炉上进行了工业性试验,取良好的试验效果。     

The mechanism of oxidation of copper in alkaline solutions

The formation of Cu₂O by the oxidation of Cu in alkaline solutions under various controlled potential conditions has been studied by potentiodynamic methods, the rotating ring disc technique and by employing colloidal Cu(OH)₂ electrodes supported on vitreous carbon.The kinetics of the electrochemical reactions, both anodic and cathodic, are interpreted in terms of a complex reaction mechanism involving various intermediates participating in the phase oxide formation, (e.g. adsorbed OH, soluble Cu(I) and metal sites of different activity).Besides the electrochemical reactions the model includes various ageing and surface restructuring processes. The growth mechanism is envisaged to depend on the conditions of oxidation.