圆筒型直线感应电动机推力特性计算

本文采用了伽辽金有限元方法,计算了具有运动次级的圆简型直线感应电动机的推力特性.为计及次级运动的感应作用,在扩散方程中增添了运动项,同时考虑了铁芯饱和及涡流效应,以及齿槽和边端效应的影响.所得计算值与实验结果吻合较好.文章还对气隙磁场进行了定量分析.     

Toxicity of the common puffer fish in Hong Kong

Résumé L'origine et la nature probable de la toxicité chez deux espèces de poissons (Fugu etLagocephalus) a été étudiée. Les tissus énumérés dans l'ordre de toxicité décroissant sont les gonades, le foie et les muscles, avec une différence entre les deux sexes, les tissus mâle étant plus toxiques que les tissus femelles. On a éliminé la toxicité par un traitement thermique prolongé et maintenu à 120 °C.

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This work was financially supported by the Chinese University of Hong Kong, and the mice were generously supplied by Dr. {pcD. Huang}.     

牛粪再生饲料的研究

本文利用牛粪中自然菌群进行发酵。通过控制发酵温度、发酵时间和料液浓度等参数,得到了适口性较好的畜、禽、鱼牛粪再生饲料。此饲料蛋白质含量达10％以上,必需氨基酸含量较高。     

2,4-二羟基苯甲醛-甘甘二肽席夫碱及其3d—过渡金属配合物的研究

合成了2,4-二羟基苯甲醛-甘甘二肽席夫碱(K·GGRS·H_2O)及其Mn(Ⅱ),Co(Ⅱ),Ni(Ⅱ),Cu(Ⅱ)等4种未见报导的配合物,通过元素分析、热重-差热分析、红外光谱、核磁共振谱、电子光谱、摩尔电导等方法对配体及配合物进行了表征,生物活性测定表明,配合物均具有一定的抗菌活性。     

造纸生产中控制纸张定量与水份的微机系统

本文介绍了一种适合于中、小纸厂使用的造纸生产过程中对纸张定量与水份进行控制的微机系统。该系统使用汇编语言,模块化结构。控制系统的数学模型采用变系数 PID 算法,缩短了调节时间。     

论大洋河流域发展小水电的可行性

世界各国都面临能源危机问题,我国的能源也异常紧张.但我国的水能蕴藏量比较丰富,居世界首位.然而,我国的水能开发量却很低,现已开发利用的水能仅占我国水能总蕴藏量的4.5%,且都集中在大、中河流上,对水能资源较丰富的流域开发极少,为了充分开发小流域的水能资源发电,改变我国的能源紧张状况.本文对大洋河流域发展小水电的可行性进行论证.     

Changes in the expression of the glutamate transporter EAAT3/EAAC1 in health and disease

Excitatory amino acid transporters (EAATs) are high-affinity Na⁺-dependent carriers of major importance in maintaining glutamate homeostasis in the central nervous system. EAAT3, the human counterpart of the rodent excitatory amino acid carrier 1 (EAAC1), is encoded by the SLC1A1 gene. EAAT3/EAAC1 is ubiquitously expressed in the brain, mostly in neurons but also in other cell types, such as oligodendrocyte precursors. While most of the glutamate released in the synapses is taken up by the “glial-type” EAATs, EAAT2 (GLT-1 in rodents) and EAAT1 (GLAST), the functional role of EAAT3/EAAC1 is related to the subtle regulation of glutamatergic transmission. Moreover, because it can also transport cysteine, EAAT3/EAAC1 is believed to be important for the synthesis of intracellular glutathione and subsequent protection from oxidative stress. In contrast to other EAATs, EAAT3/EAAC1 is mostly intracellular, and several mechanisms have been described for the rapid regulation of the membrane trafficking of the transporter. Moreover, the carrier interacts with several proteins, and this interaction modulates transport activity. Much less is known about the slow regulatory mechanisms acting on the expression of the transporter, although several recent reports have identified changes in EAAT3/EAAC1 protein level and activity related to modulation of its expression at the gene level. Moreover, EAAT3/EAAC1 expression is altered in pathological conditions, such as hypoxia/ischemia, multiple sclerosis, schizophrenia, and epilepsy. This review summarizes these results and provides an overall picture of changes in EAAT3/EAAC1 expression in health and disease.