" britain is facing an ageing time bomb with major challenges presented by retirement , the desire to live longer and the increasing burden of caring for older people , " said andrew vallance - owen , bupa ' s medical director Bupa的主任医师安德鲁?瓦伦斯欧文说： " '老龄化'就像一颗定时炸弹，英国正面临着退休、渴望长寿以及不断加剧的养老负担带来的各种挑战。
" britain is facing an ageing time bomb with major challenges presented by retirement , the desire to live longer and the increasing burden of caring for older people , " said andrew vallance - owen , bupa s medical director Bupa的主任医师安德鲁瓦伦斯欧文说： " ‘老龄化‘就像一颗定时炸弹，英国正面临着退休渴望长寿以及不断加剧的养老负担带来的各种挑战。
At the same time , the results show that the minimum pd quantity and its discharge numbers also add along with the aging time increasing . and the craggedness degree of - q figure of pd becomes steep along with ageing time too 局部放电的最小放电量随着老化时间的增大其值也逐渐增加，而且放电次数也不断增加，因此，这也可以作为一个特征量来进行绝缘监测。
During isothermal aging , impact energy rapidly decreases and embrittlement rapidly increases with increasing aging time . when the aging time reaches 120 seconds , the minimum impact energy is obtained where the embrittlement attains the largest 等温时效初期，随着时间的延长，冲击功迅速下降，在120秒左右时，出现最低值，当时间进一步延长，冲击功缓慢上升。
It was demonstrated that the reaction temperature , solvent , concentration of the reactants and catalyst , ageing time affected the particle size and distribution . by controlling these factors or feeding teos step after step , monodispersed and spherical ultrafine sio2 powder could be prepared 讨论了醇、水、氨、正硅酸乙酯、温度、陈化时间等多种影响因素对颗粒粒径及粒径分布的影响，得出了制备超细二氧化硅粒子的优化的工艺条件。
As the aging time increases further , the impact energy is gradually increased and the embrittlement is gradually improved . changing of impact energy with time responses of the kinetics of non - equilibrium segregation , so the time at which the impact energy is minimum is measured as the critical time . as measure in this experiment the critical time of sn non - equilibrium segregation is 120 seconds at 750 冲击功随保温时间的变化反映了sn的非平衡品界偏聚动力学过程，因此把冲击功达到最小值时的保温时’间作为s ， 1发生非平衡晶界偏聚的临界时间，本试验测出sn在0 ， 15wt . % c钢中750保温时发生非平衡晶界偏聚的临界时间为1205左右。
In the third chapter , the influence of current density , solution concentration , erosion time and aging in ambient air on the pl spectra of ps suggests that peak would blue shift with current density increasing , and with erosion time and aging time prolonging ; with the increasing of solution concentration , peaks would red shift when solution concentration less than 1 : 1 but blue shift when solution concentration greater than 1 : 1 . above phenomena can be explained by quantum confinement and light center model , but do not deny the action of si - h bonding and defect on the surface in the process of photoluminescence . at present , radiation mechanism is still one of the primary problems in the study of ps 在第z三章中；通过对比，分析了电流密度、阳极化时间、溶液浓度以及自i然氧化时间对多孔硅光致发光光谱的影响，认为在一定的范围内，多i孔硅的发光峰位会随电流密度的增大而蓝移，要获得较强的发光，需z要选择合适的电流密度；随着腐蚀时间的延长，多孔硅的发光峰位会i发生蓝移；当f酸的浓度较小q ： 1 ）时，峰位随浓度的增大表现为向i低能移动；而当f酸的浓度较大河山时，峰位随浓度的增大则表现z为移向高能；多孔硅在空气中自然氧化；其发光峰位发生蓝移，而强i度随放置时间的延长而降低。
In order to obtain the mn - zn ferrite precursor particle which has itra - fme property , the optimum technological condition was obtained through the orthogonal experiments in this paper . in the co - precipitation procession of preparation the leading factors that affect the size of the particle are ratio of the ion concentration ( a ) , ph of the reaction ( b ) , temperature of reaction ( c ) , and aging time ( d ) 本文通过拉丁正交试验，以粒径尺寸为考察目标，将离子浓度比( a ) ，反应ph值( b ) ，水浴温度( c )和陈化时间( d )作为四参量，利用每一参量为变量进行试验确定各参量值，从而确定制备超细锰锌铁氧体前驱体粉末的条件。
In this paper , the aqueous sol of sno2 ultrafme particles were prepared by the colloid chemistry method . here we found that the partical properties of sno2 was concerned with experimental parameters such as type of peptization acid , sn4 + concentration , peptization time , peptization temperature , ageing time et al 本文采用胶体化学法制备了sno _ 2纳米粒子水溶胶，细致研究了胶溶酸类型、 sn ~ ( 4 + )浓度、胶溶温度、胶溶时间、陈化时间等对纳米粒子性质的影响，并利用浸渍提拉法制备了sno _ 2超微粒子薄膜。
In this paper , the multifactors - electrical , thermal , cool and thermal circulation of accelerating ageing experiment based on the stator bar of 220mw turbine generator has been conducted in the laboratory . the results of the experiment show that there has not fixed rule between maximum pd quantity and insulation , but the increasing of maximum pd grads increase along with ageing time of insulation 本论文通过对220mw的汽轮发电机真机线棒进行电、热、冷热循环等多因子老化试验，发现局部放电的最大放电量与绝缘老化时间之间没有固定的规律可寻，而最大放电量的梯度随绝缘老化时间的增大而增大。
