期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
Use of Foot Measurements as Sonographic Parameter for Estimation of Fetal Age
1
作者 Bushra Abdel Malik Mohammed Ibrahim +3 位作者 Qurashi Ali Mohamed Yousef Qurain Turki Alshammari Saddig Jastaniah 《Open Journal of Medical Imaging》 2017年第4期248-262,共15页
Objectives: this research was conducted to describe the ultrasonic measurements of the foot full measurements (FFM) and their importance in the antenatal care (ANC). Material and methods: the Descriptive quantitative ... Objectives: this research was conducted to describe the ultrasonic measurements of the foot full measurements (FFM) and their importance in the antenatal care (ANC). Material and methods: the Descriptive quantitative cross-sectional study conducted in the ultrasound department at Alshaekh Mohammed Ali Fadol hospital in Omdurman locality. The study included 400 healthy Sudanese pregnant women whom in the 1st (late), 2nd and 3rd trimesters (i.e., after 10 weeks gestational age) of different parity and ages (15 years old and above);they have regular menstrual cycle and well certain of their last menstrual period and calculated date of delivery. Ultrasonographic measurement of Full Foot Length1 (FFL1), Foot Full Length2 (FFL2), and Foot Full Width (FFW) of all pregnant women were done. Sonographically we measured fetal foot from 14 to 40 weeks of gestation. Results: the study revealed that the mean FFL1 was 58.7 ± 12.9 mm. The minimum measurement was 18.8 mm, and the maximum was 89.1 mm, while the mean value of FFL2 was 53.4 ± 11.4 mm, with minimum value 17.5 mm and maximum 81.7 mm, and the mean FFW was 23.7 ± 5.1 mm, with minimum value 7.0 mm and maximum 38.0 mm. Conclusion: a strongly significant relationships were observed between (FFL1, FFL2, FFW) and gestational age (p = 0.00). However there is no significant difference between the FFL1, FFL2, and correlations with sex of embryo, residence, occupation, parity, maternal height, socioeconomic status, bleeding during this pregnancy, chronic illness, and caesarian section, moreover there are significant correlations between the FFL1, FFL2 and the (maternal age, maternal weight, and body mass index), but in the measurement of the fetal FFW there were no significant correlations with (sex of embryo, maternal age, body mass index, residence, occupation, parity, socioeconomic status, bleeding during this pregnancy, chronic illness, and caesarian section). Also there are significant correlations between the FFW and the maternal weight and height. 展开更多
关键词 GESTATIONAL Age Full FOOT MEASUREMENTS FOOT Full length1 (FFL1) FOOT Full Length2 (FFL2) and FOOT Full WIDTH (FFW)
下载PDF
模式液晶透镜的制备与光学成像特性研究 被引量:1
2
作者 李东平 匡文剑 李青 《光电子技术》 CAS 北大核心 2014年第4期221-225,共5页
在原有圆孔型液晶透镜和模式液晶透镜(MLCL)理论的基础上,将MLCL的等效电路模型和液晶的连续弹性体理论相结合,提出了一种简洁的MLCL的理论仿真方法。利用已有的实验工艺制备出了通光孔径为4 mm,盒厚为50μm,方阻为2 MΩ/sq的MLCL。此... 在原有圆孔型液晶透镜和模式液晶透镜(MLCL)理论的基础上,将MLCL的等效电路模型和液晶的连续弹性体理论相结合,提出了一种简洁的MLCL的理论仿真方法。利用已有的实验工艺制备出了通光孔径为4 mm,盒厚为50μm,方阻为2 MΩ/sq的MLCL。此透镜的成像特性和焦距都可以通过调节施加在透镜上的电压的幅值和频率来调控。搭建实验平台,来实际测量、观测不同电压值和频率下透镜的焦距和成像效果,并对之进行详细的分析。 展开更多
关键词 液晶透镜 等效电路模型 成像效果 焦距
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部