植物化学杀雄研究进展

介绍了化学杀雄剂诱导植物雄性不育的变化,回顾了化学杀雄杂种优势利用研究的进展,阐述了化学杀雄杂种优势利用的特点,以及化学杀雄剂的设计思路和常用的化学杀雄剂。     

Australian junior exploration floats, 2001–06, and their implications for IPOs

An analysis of 179 junior exploration floats, listed on the Australian Securities Exchange (ASX) between July 2001 and June 2006, helped to build a basic understanding of the strategy and business structure of these companies. The “typical” junior explorer raised A$4 million at initial public offering (IPO) to finance a 2-year, mainly greenfields exploration program. The capital raised at IPO entitled its investors to approximately half of the company, with the balance in the hands of the promoters, vendors and/or seed capital investors. Of the A$4 million raised at IPO, it intended to spend approximately two-thirds on exploration, while the remainder was absorbed in corporate overheads and the costs of the IPO. Once these were paid, ongoing corporate overheads averaged approximately 28% of its total operational expenditure. However, given an average total annual expenditure of approximately A$2.6 million, most juniors held insufficient capital reserves to meet operational costs beyond a time frame of 2 years. As at October 2006, 9% of the companies were in the process of mine construction, whereas 6% had made it to producer status. The lead time from listing to production ranged from 1.5 to 53 months, giving a median of 28 months.     

复合生物反应器工艺对化纤废水的处理研究

在普通活性污泥系统的曝气池中投加一定量的填料构成复合生物反应器 ,可以增加曝气池中的生物体量至 6g/L左右 ,在HRT为 8h ,泥龄为 5d时 ,CODCr、氨氮的去除率分别提高了 2 0 %和9.6% ,容积负荷对复合生物反应器的脱氮能力影响较小。该工艺对污泥膨胀有较好的控制     

全球碳交易市场对中国经济-能源-气候系统的影响评估

国际气候谈判中,美国等发达国家把中国承诺强制减排目标作为其加入全球减排协定的前提,那么如果我国加入全球碳交易市场,将会对我国产生怎样的影响呢?本文基于Ramsey最优增长模型和博弈论思想,构建世界诱导技术变化混合(WITCH)模型,模拟评估全球碳交易市场对我国经济-能源-气候系统的影响,结果表明:12014年(GCM2014情景)和2020年(GCM2020情景)加入全球碳交易市场,到2100年我国GDP比常规情景(BAU情景)下分别减少6.42%和10.22%,说明加入全球碳市场将会对我国经济增长产生较大的负面影响,越早加入负面影响越小;2BAU、GCM2014和GCM2020三种情景下,2100年我国总投资分别达到98.48亿美元、85.59亿美元和85.13亿美元,其中我国能源研发投资预计分别为32.9亿美元、82.5亿美元和96亿美元,说明对我国总投资的影响差异不是很大,但对能源技术研发投资却有快速而显著的促进作用;3BAU、GCM2014和GCM2020三种情景下,2100年我国一次能源消费分为270 EJ、247 EJ和254 EJ,说明全球碳交易市场可以减少我国一次能源的总消费,但总量减少不是太显著,却能显著减少我国的煤炭等化石能源的消费量,因为GCM2014和GCM2020情景下,2100年煤炭消费仅占到我国一次能源消费的10%左右,而BAU情景下煤炭仍占59%;4全球碳交易市场可以比较显著的降低我国能源强度和碳排放强度;5全球碳交易市场的建立能有效降低全球气温,但不能将气温升幅控制在2℃范围以内。因此,我国要结合本国国情和实际,先建立国内碳交易市场,避免在国际压力下盲目承诺加入全球碳交易市场,至少2020年前我国不应该加入全球碳交易市场。     

低温条件生物膜与活性污泥复合工艺强化生物脱氮性能的中试研究

中试采用生物膜与活性污泥复合工艺对中国北方某城镇污水处理厂的污水进行处理,考察其在低温条件下对污水中的有机物及含氮污染物的去除能力.结果表明,当进水COD和NH+4-N浓度分别为53~140 mg/L和21~78 mg/L时,生物膜与活性污泥复合工艺出水COD和NH+4-N浓度分别在24~48 mg/L和0.5~3 mg/L范围内,满足《城镇污水处理厂污染物排放标准》一级A标准(冬季COD<50 mg/L,NH+4-N<8 mg/L),而该污水处理厂原有工艺出水COD和NH+4-N浓度分别在20~73 mg/L和9~20 mg/L之间.因此,在低温条件下,生物膜与活性污泥复合工艺能够提高对污染物的去除能力.     

工业级远程环境监测管理系统

针对一些工业生产发达地区污染源众多而且分散的特点,提出一套工业级远程环境监控管理系统,为环保执法人员提供了技术辅助手段.系统分为下位机和上位机两部分,适用于高温高粉尘的工业生产环境,满足稳定性和健壮性要求.系统已应用于佛山市南海区多家铝型材厂,取得良好的效果.     

混杂纤维混凝土高温性能研究

根据近年来对纤维混凝土高温性能的试验研究,分析了纤维对混凝土高温性能的影响,探讨了纤维混凝土在高温下的力学性能及合理的纤维掺量,以期为今后混杂纤维混凝土的高温性能研究及其应用起到指导作用。     

Evaluation of factors influencing soluble microbial product in submerged MBR through hybrid ASM model

In this study, a mathematical model was established to predict the formation of the soluble microbial product (SMP) in a submerged membrane bioreactor. The developed model was calibrated under the reference condition. Simulation results were in good agreement with the measured results under the reference condition. The calibrated model was then used in the scenario studies to evaluate the effect of three chosen operating parameters: hydraulic retention time (HRT), dissolved oxygen concentration, and sludge retention time (SRT). Simulation results revealed that the SMP dominated the soluble organic substances in the supernatant. The scenario studies also revealed that the HRT can be decreased to 1 h without deteriorating the effluent quality; dissolved oxygen concentration in the reactor can be kept at 2–3 mg/L to maintain the effluent quality, reduce the content of SMP, and minimize operating costs; the optimal SRT can be controlled to 10–15 d to achieve complete nitrification process, less membrane fouling potential, and acceptable organic removal efficiency.     

Effects of phenanthrene on hepatic enzymatic activities in tilapia (Oreochromis niloticus♂×O. aureus♀)

The effects of phenanthrene (Phe) on hepatosomatic index (HSI) and hepatic enzymatic activities in hybrid tilapia (Oreochromis niloticus O. aureus ) were investigated via the static freshwater exposure at dosage of 50, 100, and 400 g/L for 4–14 d. Compared with the control group, HSI was significantly decreased (P < 0.05) at 400 g/L at day 14. Increased enzymatic activities (P < 0.05) were observed for catalase (CAT), glutathione peroxidase (GPx) and superoxide dismutase (SOD) at either 100 or 400 g/L at day 8 and 14, as well as for CAT at 50 g/L at day 14, except for GPx at 400 g/L at day 8. Ethoxyresorufin O-deethylase (EROD) activity was significantly increased (P < 0.05) at all dosage at day 4 as well as at 50 g/L at day 8, but significantly decreased at either 100 or 400 g/L at day 14 (P < 0.05). Glutathione-S-transferase (GST) activity was not a ected. The results suggest that CAT, GPx, SOD and EROD, as well as HSI in tilapia may be used as the biomarkers or indexes for evaluating or monitoring the pollution of polycyclic aromatic hydrocarbons (PAHs) such as Phe.     

Membrane flux dynamics in the submerged ultrafiltration hybrid treatment process during particle and natural organic matter removal

Exponential relationship was developed to quantify the normalized membrane flux dynamics during the filtration period and fitted the results well.