挤密灌浆法(CGS)在已有建筑物增层改造中地基加固补强中的应用

新扩建6层裙房工程,拟建在原有人防地下室上面,在不拆除原有人防地下室的情况下,对原有构筑物桩基、地板下地基进行挤密灌浆,使原有构筑物桩基和地基承载力提高3倍,满足新扩建6层裙房承载力要求。

提高植物游离蛋氨酸含量的基因工程途径

蛋氨酸是一种含硫的必需氨基酸,在人类和动物营养中占有重要地位,但很多粮食作物(如豆类)的蛋氨酸含量偏低,通过常规育种手段提高作物蛋氨酸含量的潜力有限。近年来,利用基因工程手段已成功地在许多植物中提高了蛋氨酸的含量。本文综述了通过基因工程手段提高植物蛋氨酸含量的两种途径:提高富含蛋氨酸的储藏蛋白含量和提高游离蛋氨酸的含量。文中重点介绍了蛋氨酸合成过程中的关键酶——胱硫醚γ-合成酶(CGS)的功能、胱硫醚γ-合成酶N端在维持CGS mRNA稳定性方面的作用和对其进行调控的分子机制,指出了目前通过分子育种手段提高蛋氨酸含量方面存在的问题,认为要提高豆类作物的含硫氨基酸含量,应将CGS基因和富含蛋氨酸的储藏蛋白基因同时进行转化。

Investigation on the Sterility Changeover of Male Sterility Line CMS7311 in Heading Chinese Cabbage

Sterility changeover induced by low temperature in male sterility line CMS7311 of heading Chinese cabbage ( Brassica campestris L. ssp. penkinsis) was investigated under constant temperature, day/night alternating temperature in light-growth-incubator and outdoor natural day/night alternating temperature respectively. It showed that the sterility of CMS7311 has significant change with temperature. The constant temperature of 6 - 12 degreesC was suitable to induce the changeover of sterility (CGS) of CMS7311 ; the shortest treatment time for CGS induction at this temperature was 3 d. The significant value of sterility changeover of CMS7311 occurred at the constant temperature of 6 - 9 degreesC after treatment for 6 - 9 d. The intensity of CGS was stronger under constant temperature than under alternate temperature, but the shortest treatment time inducing CGS has no difference between them. When treated for 9 d under the day/night alternating temperature of 11/7 degreesC, its sterility could also turn to normal fertility (near to sterile grade I or zero). In normal condition, the interval from the end of temperature treatment to the beginning of CGS induction was 10 - 16 d. In the condition of natural day/night alternating temperature, the lower limit of temperature for effective CGS induction was at the daily mean temperature ( DMT) of 3. 5 - 6. 8 degreesC, and the shortest treatment time which could induce the sterility changeover was also longer than that under constant temperature, being 11d at DMT of 1.5 - 3.1 degreesC. In addition, for the apical dominance, the flower bud on the first lateral branch showed the CGS 8 - 10 d later than the flower bud on the main stem under the same temperature with the same days of treatment. The intensity of CGS of CMS7311 on the first lateral branch was also weaker than the flower bud on the main stem.

Laboratory large-scale pullout investigation of a new reinforcement ofcomposite geosynthetic strip

In this paper,more than 70 large-scale pullout tests were performed to evaluate the performance of an innovative composite geosynthetic strip(CGS)reinforcement in sandy backfill.The CGS reinforcement is composed of a geosynthetic strip(GS)and parts of a scrap truck tire as transverse members.The experimental pullout results for the CGS reinforcement were compared with the suggested theoretical equations and ordinary reinforcements,including the GS,the steel strip(SS),and the steel strip with rib(SSR).The pullout test results show that adding three transverse members to the GS reinforcement(CGS3)with S/H?6.6(where S and H are the space and height of the transverse members,respectively)increases pullout resistance by more than 120%,170%,and 50%compared to the GS,the SS,and the SSR,respectively.This result shows that the CGS3(CGS with three transverse members)reinforcement needs at least 55.5%,63%,and 33.3%smaller length compared to the GS,the SS,and the SSR,respectively.In general,implementation of mechanically stabilized earth wall(MSEW)with the proposed strip may help geotechnical engineers prevent costly designs and solve the problem of MSEW implementation in cases where there are limitations of space.

利用气化渣制备多孔材料及其在含酚半焦废水处理中的应用

开发了一种以煤气化渣(CGS)为原料,通过酸碱浸泡及活化处理,制备多孔材料NGS的工艺,并研究了NGS对含酚废水的处理效果。经检测,NGS材料具有丰富的孔结构,比表面积达到568 m^(2)/g,孔容达到0.507 cm^(3)/g;NGS材料对苯酚溶液的最佳吸附条件为:溶液体积和吸附剂质量比为100 mL∶3 g、温度为30℃、pH为7、充分反应30 min,在该条件下,苯酚溶液质量浓度从1000 mg/L降至38 mg/L。将NGS材料应用于半焦废水处理,其对挥发酚的单位吸附量达到20.7 mg/g,且在120℃条件下加热再生3 h、循环使用5次后,仍保持较好的吸附能力。