It will be safer to walk the streets because people will not need to carry large amounts of cash; virtually all financial ______ will be conducted by computer.
A. transactions
B. transmissions
C. transitions
D. transformations
某砌体承重结构,底层砖墙370mm厚,采用钢筋混凝土条形基础。地质条件如下:地面下3.5m厚黏土层,物理性质指标:γ=18.6kN/m,ωL-=39.4%,ωp=23.2%,ω=26.6%,ds=2.70,Es=6.9MPa,fak=200kPa。其下为淤泥质土层,物理性质指标为:ω=52%,Es=2.3MPa,fak=76kPa。上部结构荷载效应为:正常使用极限状态下的荷载效应的标准组合:Fk=210kN/m,Mk=40kN·m承载能力极限状态下的荷载效应的基本组合:Fk=235kN/m,Mk=55kN·m 试设计该基础(基础底面埋深可取2.0m,基础混凝土强度等级C20;100厚混凝土垫层C10;混凝土轴心抗拉设计强度ft=1.1N/mm2;钢筋采用HPB235,钢筋强度设计值:fy=210N/mm2)。 如果设计基础底宽度为b=1.5m,计算出基底附加压力为Po=120kPa,计算地基持力土层(黏土层)的压缩变形量为( )。
A. 21mm
B. 36mm
C. 75mm
D. 135mm
In a world where bad news has become everyday news, people are turning to an ancient technique to deal with stress: meditation. At meditation centers, prayer groups and yoga studios around the United States, more and more are finding peace of mind by being quiet: Some use meditation to help deal with life changes; others, to process the painful reality of political and social unrest around the world of the type that has been experienced more recently. Stress from the September 11 terrorist attacks is "probably about 70 percent" of the reason one Chicago man started meditating and practicing yoga with his new wife. He became so emotionally affected that he realized he needed help in managing his stress. The yoga classes he takes begin and end with meditation. This "quiet time" helps him feel a lot more relaxed and gives him more breath control. The fact is,though ,that he is not alone. Across the country, many are turning to more meditative exercise as they seek both psychological and physiological relief. In addition to helping people work out their stress, these classes bring people together, in the same way that religious services or other community activities have done in the past. Different schools of meditation teach particular techniques, but they share a common basis―focusing attention on something your mind can return to if you are distracted. This may be the rhythm of breathing, an object such as a candle flame loving kindness, or a repetitive movement, as in walking or t’’ai chi (taiji). Regardless of the specific technique or mode that is followed, meditation has well-documented benefits. Medical research indicates that it causes a sharp decrease in metabolic activity, reduced muscle tension, slower breathing, and a shift from faster brainwaves to slower waves. It also reduces high blood pressure. Practitioners are convinced that meditation is good for health because it relaxes the body. For ages, meditation has been a core practice of many groups meeting in their communal or religious centers. However, let’’s not forget that this is the twenty-first century. So, for those people who are too shy or busy to go to the nearest meditation center, there are Internet sites that offer online guided meditation. One has a variety of meditations from various religious traditions. At another, Jesuit priests post meditations and readings from the Scriptures every day, and at still another, Buddhist and Hindu practitioners include music and visuals to accompany their offerings. These websites allow anyone with a computer access to meditation at any time. The fact is that whether online, at Yoga classes, or at local spiritual centers, more people are turning to the practice of meditation. The underlying approach of meditative techniques requires
A. modes identical to religious services.
B. restless repetition of a certain prayer.
C. continuous movements of t’’ai chi.
D. a great deal of mental concentration.