钢制管道焊接后补口防腐

目前大口径钢制防腐管道在市场上的应用趋于广泛,主要应用于长输水管线、市政管网、循环水补水管路系统等。产品一般采用工厂管道加工防腐、现场焊接、焊缝防腐层补口的工艺。防腐管路系统中的防腐和连接,是防腐管道系统质量的关键!而焊缝的补口,则是重中之重!腐蚀,是从最薄弱的环节开始的。所以,大口径钢制防腐管道焊接后的防腐层补口,对于整个管路系统的保护具有深远的意义。

High resolution angular-displacement sensor based on whispering gallery mode resonance in bent optical fibers

A simple fiber sensor to measure angular displacement with high resolution, which is based on whispering gallery mode （WGM） resonance in bent optical fibers,is proposed. The sensor is composed of a single loop formed by loosely tying a knot using single mode fiber. To measure the transmission spectra, a tunable laser and an optic power meter are connected to the two ends of fi- ber loop, respectively. Significant WGM resonances occur over the investigated wavelength range for all the sensors with different bend radius. The angular-displacement sensitivity is studied in the range from -0. 1°to 0. 1°. The detection limit of 1.49 × 10 ^-7 rad can be achieved for the detecting system with the resolution of lpm. The simple loop-structure fiber sensor has potential application prospect in the field of architecture or bridge building with low detection limit and low cost.

家庭社会经济地位与儿童抑郁症状的关系:多重中介效应分析

目的:考察家庭社会经济地位与儿童抑郁症状的关系,探究母亲亲职压力和儿童情绪调节的中介作用。方法:使用亲职压力量表、情绪调节问卷和流调中心抑郁量表对北京市4所小学的儿童及其母亲进行调查,收集有效数据484份。结果:(1)家庭社会经济地位对儿童抑郁症状不存在直接的预测作用;(2)母亲亲职压力和儿童表达抑制分别在家庭社会经济地位和儿童抑郁症状间起完全中介作用;(3)母亲亲职压力与儿童认知重评在家庭社会经济地位和儿童抑郁症状间起链式中介作用。结论:家庭社会经济地位既可以分别通过母亲亲职压力和儿童表达抑制预测儿童抑郁症状,也可以通过母亲亲职压力和儿童认知重评共同预测儿童抑郁症状。