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能传送565Mbit/s信号的光纤线路复用终端机（GD/MF566H—I）业已研制成功。本文就该设备的组成、技术指标和性能等进行了说明;此外,还介绍了其室内传输试验的情况。

【目的】探讨在血糖控制良好的妊娠糖尿病（GDM）孕妇中，脐血瘦素与新生儿体质指标的关系。【方法】收集2006年11月至2007年2月于我科住院分娩的孕妇150例，其中糖代谢异常，包括GDM和妊娠期糖耐量异常（GIGT），而且血糖控制良好的孕妇73例，糖耐量正常的孕妇77例，其新生儿分为大于胎龄儿（LGA）25例和适于胎龄儿（AGA）125例两组。比较分析了两组新生儿的体质指标、脐血瘦素等指标。【结果】LGA与AGA相比，脐血的瘦素水平LGA组的更高（16.17±12.53 vs 10.84±8.41 μg/L， t=2.339，P

本专栏刊出的是武汉邮电科学研究院89级5名硕士生论文摘要。本编辑部正进一步组织论文作者,就其论文内容,分专题整理出一批较精练的文章。这些文章本刊计划在今后几期内发表,供读者参考。

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一、前言对于图象信号来说,DPCM是效率比较高的频带压缩编码方式之一。它是利用图像中各像素之间的相关性,根据已经出现的像素值进行预测,只对实际值和预测值的差值进行编码的方式。如文献中所述,对于彩色电视信号来说,由于在信号频谱中存在着以色副载频为中心的已调色信号,从而使像素之间的相关性降低。这时,如果对它直接施行DPCM编码,就不能充分发挥这种编码方式的效率。当利用文献的分离设

一、前言与模拟传输相比,彩色电视信号的数字传输具有传输效率高,图像质量好,工作灵活性大等优点,并且提高了国际间不同电视制式的节目交换的可能性。为了更有效地利用数字传输线路,文献中提出了许多种彩色电视信号的频带压缩编码方法,大体上可以分为两大类:直接编码方式和分离编码方式。

数字通信以其优异的传输特性和容易对各种信息源匹配等特点,日益受到重视。因此,我国也在积极发展数字通信系统。由于我国数字通信方面的基础还比较薄弱,尚不能很快地满足当前的急需,因此,在短期内将是尽快地发展模拟通信手段。这样,在我国通信网的结构上,也必然会出现模拟网和数字网的并存问题。因此,在研制数字通信设备的同时,还必须研究模拟通信系统与数字通信系统的相互转接的问题。模拟系统与数字系统相互转接的方法可如图1所示。由图看出,转接方法可分为两大

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Perimenopausal psycho-cardiological disease is a cardiovascular and psychological disease in women seen before or after menopause. Traditional Chinese medicine believes that the perimenopausal period is closely related to the rise and fall of Tiangui, while psycho-cardiological disease is related to the brain, heart, and kidney. In terms of material homology, structural relationships, and physiological functioning, Tiangui is closely related to the “kidney-heart-brain” axis, which together ensure the normal life activities of the human body, forming the theory of “ Tiangui and the ‘ kidney-heart-brain’ axis”. According to the theory of Tiangui and the “kidney-heart-brain” axis, the pathogenesis of perimenopausal psycho-cardiological disease is explained, and it is believed that the root cause of the disease is the deficiency of Tiangui due to the declining function of the kidney, heart, and brain. Under the guidance of the theory of Tiangui and the “ kidney-heart-brain” axis, aiming at the characteristics of the disease with deficiency in nature and excess in superficiality, the main acupoints are selected to treat the kidney, heart, and brain at the same time. Shenshu(BL23) was selected to tonify the kidney, Neiguan(PC6) was selected to boost the heart, and Baihui(DL20) was selected to strengthen the brain. The symptoms of patients were considered to select the appropriate acupoints. [ABSTRACT FROM AUTHOR]

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Experience about stormwater management in developed countries has great referential value for the construction of Sponge City, a concept aimed at mitigating the problem of urban waterlogging in China. Through the combination of literature review and field research, comparison about the current status of urban stormwater management between several cities in China and Italy is made, and the similarities in management are discussed. Based on the analysis of the differences in spatial distribution of urban green areas between the two countries, referable experience and implications of Italian stormwater management practice to the Sponge City program are summarized. According to the current situation, suggestions are made for the construction of Sponge City. Both countries use a top-down approach in stormwater management. Decentralized greens in Italian cities contribute to the full play of their rainwater absorption function. High proportion of private greens releases the pressure of maintenance for the Italian government. In Chinese cities, green areas are relatively concentrated. Problems of insufficient sponge facility maintenance in residential areas exist. It’s necessary for China to enhance stormwater management efficiency through decentralized green infrastructure construction according to local situation. In addition, public participation in the construction process of Sponge City should be encouraged, and experience of developed countries can be employed as reference to improve the management mode of Sponge City. [ABSTRACT FROM AUTHOR]

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Nuclear factor（NF-Y）is a kind of transcription factor widely existing in eukaryotes, and can play an important role in the regulation of abiotic stress response in plants. Exploring the drought resistance and mechanism of soybean GmNF-YA19 will lay a foundation for the application of GmNF-YA19 in drought resistant breeding. Real-time fluorescence quantitative PCR（RT-qPCR）was used to detect the expression of GmNF-YA19 under abiotic stress. GmNF-YA19 was cloned. Its plant expression vector was constructed and transformed into tobacco, and the drought resistance of transgenic tobacco was identified. RT-qPCR results showed that GmNF-YA19 responded to drought, salt, cold and exogenous ABA in soybean, and the expression of GmNF-YA19 increased most significantly under drought stress. GmNF-YA19 was cloned by PCR using soybean leaf cDNA as template. Sequence analysis revealed that GmNF-YA19 encoded a protein containing 213 amino acids, with predicted molecular weight of 22.99 kD and predicted isoelectric point of 9.40. GmNF-YA19 protein sequence contained a conserved CBF domain.Phylogenetic analysis demonstrated that GmNF-YA19 protein was closely related to OsNF-YA7, AtNF-YA4 and AtNF YA7 proteins. Four transgenic tobacco plants were obtained. The heterologous expression of GmNF-YA19 enhanced the drought resistance of transgenic tobacco plant under drought stress. Compared with wild-type tobacco, the expressions of three stress-related genes（NtABA2, NtNCED3-2 and NtP5CS）in GmNF-YA19 transgenic tobacco significantly increased. [ABSTRACT FROM AUTHOR]

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