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  • 1
    Language: English
    In: Environmental science & technology, 2009-12-15, Vol.43 (24), p.9400-9406
    Description: Nitrite has been commonly recognized as an important factor causing N2O production, which weakened the advantages of nitrogen removal via nitrite. To reduce and control N2O production from wastewater treatment plants, both long-term and batch tests were carried out to investigate main sources and pathways of N2O production during nitrogen removal via nitrite from real domestic wastewater. The obtained results showed that N2O production during nitrogen removal via nitrite was 1.5 times as much as that during nitrogen removal via nitrate. It was further demonstrated that ammonia oxidization were main source of N2O production during nitrogen removal from domestic wastewater; whereas, almost no N2O was produced during nitrite oxidization and anoxic denitrification. N2O production during nitrogen removal via nitrite decreased about 50% by applying the step-feed SBR, due to the effective control of nitrite and ammonia, the precursors of N2O production. Therefore, the step-feed system is recommended as an effective method to reduce N2O production during nitrogen removal via nitrite from domestic wastewater.
    Subject(s): Animal, plant and microbial ecology ; Applied ecology ; Applied sciences ; Biological and medical sciences ; Ecotoxicology, biological effects of pollution ; Exact sciences and technology ; Fundamental and applied biological sciences. Psychology ; Pollution ; Remediation and Control Technologies
    ISSN: 0013-936X
    E-ISSN: 1520-5851
    Source: Hellenic Academic Libraries Link
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  • 2
    Language: English
    In: Water science and technology, 2010, Vol.61 (9), p.2325-2332
    Description: The performance of a 18 L step-feed cyclic activated sludge technology (CAST) combined with real-time control treating real municipal wastewater was evaluated. The operation strategies employed pH and oxidation reduction potential (ORP) as on-line control parameters, which can control the durations of oxic and anoxic phases flexibly. The obtained results showed that the studied process had achieved advanced and enhanced nitrogen removal by several phases of consecutive oxic/anoxic periods. Total nitrogen in effluent was lower than 2 mg/L and the average TN removal efficiency was higher than 98%, while only requiring small amount of external carbon source. Unexpected characteristic points in pH and ORP profiles denoting the depletion of nitrate were also observed during the last anoxic phase. Denitrification rate was found to be more dependent on the system temperature compared to nitrification rate. Moreover, a stable and efficient phosphorus removal rate above 90% was achieved by using step-feed strategy which enabled the influent carbon source to be fully used and the favourable condition for phosphorus releasing to be created during the anoxic phases.
    Subject(s): Bioreactors ; Carbon - chemistry ; Carbon - metabolism ; Cities ; Hydrogen-Ion Concentration ; Nitrogen - chemistry ; Nitrogen - metabolism ; Phosphorus - chemistry ; Phosphorus - metabolism ; Sewage ; Time Factors ; Waste Disposal, Fluid - methods ; Water Pollutants, Chemical - chemistry ; Water Pollutants, Chemical - metabolism
    ISSN: 0273-1223
    E-ISSN: 1996-9732
    Source: DOAJ Directory of Open Access Journals - Not for CDI Discovery
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  • 3
    Language: English
    In: Water science and technology, 2010, Vol.62 (9), p.2028-2036
    Description: A step-feed cyclic activated sludge technology (CAST) with a working volume of 72 L treating real municipal wastewater was operated to examine the effect of varying ratios of influent COD/TN and COD/P on the nutrient removal. With the increased COD/P and COD/TN, the phosphorus and nitrogen removals exhibited an upward trend. The TN removals had a positive linear correlation with the phosphorus removal efficiencies, mainly because the presence of nitrate in the anaerobic zone negatively affected the phosphorus release thus the nitrogen removal process took priority over the phosphorus removal process to utilize the limited carbon source in the influent in step-feed CAST where simultaneous removals of nitrogen and phosphorus were achieved. By employing the effective step-feed strategy with alternating anoxic/oxic operation, efficient phosphorus and nitrogen removals of 95.8 and 89.3% were obtained with lower influent COD/P and COD/TN ratios of 61.9 and 5.2, respectively. It was also found that lower temperature, e.g. 13 ~ 16°C, did not deteriorate the phosphorus removal, though the nitrogen removal decreased significantly due to incomplete nitrification. As the temperature increased further, TN removal efficiency increased gradually and nitrogen removal via nitrite pathway was successfully achieved with average nitrite accumulation rate above 90% in the system.
    Subject(s): Nitrogen - chemistry ; Phosphorus - chemistry ; Sewage - chemistry ; Time Factors ; Water Pollutants, Chemical - chemistry ; Water Purification - methods
    ISSN: 0273-1223
    E-ISSN: 1996-9732
    Source: DOAJ Directory of Open Access Journals - Not for CDI Discovery
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  • 4
    Language: English
    In: Chemical engineering & technology, 2008-04, Vol.31 (4), p.582-587
    Description: Nitrogen removal via nitrite is a novel technology and is becoming popular for engineering applications since it results in a saving of the aeration energy required for nitritation and external carbon sources for denitritation. An alternating aerobic‐anoxic (AAA) operational pattern was applied in a sequencing batch reactor (SBR) process to improve the nitrogen removal efficiency and achieve partial nitrification via nitrite from industrial wastewater with influent alkalinity deficiencies. The results showed that the online monitoring of the pH‐time variations during nitrification could indicate if the alkalinity was sufficient and when the ammonia nitrogen was completely oxidized. Under conditions of deficient influent alkalinity, the AAA process reduced the external alkalinity and the carbon sources addition and improved the effluent quality with ammonia nitrogen concentration below the detection limits. Half of the alkalinity previously consumed during aerobic nitrification could be recovered during the subsequent anoxic denitrification period. If the cycles of alternating aerobic/anoxic were repeated more than twice, the first nitrification cycle was stopped when the pH decreased by 0.4–0.5. The middle nitrification was terminated when the pH decreased by 0.8–1.0, and the final nitrification duration was controlled by the dissolved oxygen (DO) breakpoint and ammonia valley on the pH profile. Each anoxic time‐scale for denitrification was determined by the nitrate knee on the oxidation‐reduction potential (ORP) profile and the nitrate apex on the pH profiles. In comparison to the conventional SBR process, the AAA process with a real‐time control strategy resulted in an improved nitrogen removal efficiency of greater than 97 % under conditions of deficient influent alkalinity. Moreover, nitrogen removal via nitrite was achieved with a nitrite accumulation rate above 95 %. An alternating aerobic‐anoxic (AAA) operational pattern is applied in a sequencing batch reactor (SBR) process to improve the nitrogen removal efficiency and achieve partial nitrification via nitrite from industrial wastewater with influent alkalinity deficiencies.
    Subject(s): Applied sciences ; Biological and medical sciences ; Biotechnology ; Chemical engineering ; Exact sciences and technology ; Fundamental and applied biological sciences. Psychology ; General purification processes ; Methods. Procedures. Technologies ; Nitrogen removal ; Others ; Pollution ; Process control ; Reactors ; Sequencing batch reactor ; Various methods and equipments ; Wastewaters ; Water treatment and pollution
    ISSN: 0930-7516
    E-ISSN: 1521-4125
    Source: Hellenic Academic Libraries Link
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  • 5
    Language: English
    In: NAR Genomics and Bioinformatics, 2021-06-23, Vol.3 (3), p.lqab078-lqab078
    Description: Abstract Many rare syndromes can be well described and delineated from other disorders by a combination of characteristic symptoms. These phenotypic features are best documented with terms of the Human Phenotype Ontology (HPO), which are increasingly used in electronic health records (EHRs), too. Many algorithms that perform HPO-based gene prioritization have also been developed; however, the performance of many such tools suffers from an over-representation of atypical cases in the medical literature. This is certainly the case if the algorithm cannot handle features that occur with reduced frequency in a disorder. With Cada, we built a knowledge graph based on both case annotations and disorder annotations. Using network representation learning, we achieve gene prioritization by link prediction. Our results suggest that Cada exhibits superior performance particularly for patients that present with the pathognomonic findings of a disease. Additionally, information about the frequency of occurrence of a feature can readily be incorporated, when available. Crucial in the design of our approach is the use of the growing amount of phenotype–genotype information that diagnostic labs deposit in databases such as ClinVar. By this means, Cada is an ideal reference tool for differential diagnostics in rare disorders that can also be updated regularly.
    ISSN: 2631-9268
    E-ISSN: 2631-9268
    Source: Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals
    Source: PubMed Central
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  • 6
    Conference Proceeding
    Conference Proceeding
    2012
    ISSN: 1022-6680  ISSN: 1662-8985 
    Language: English
    In: Advanced materials research, 2012-01-03, Vol.433-440, p.1213-1218
    Description: The world wide water crisis we are facing nowadays is no longer how to acquire new water resource, but rather how to manage the available water resource. The water resource management practices in China are still under the guidance following conventional mindset and compliances. It was yet brought up to people’s attention that water resource planning is a crucial element of urban planning, not to mention the effort that should be spent in investigating and exploring the potential value of water to economy, esthetics and social development. This paper introduced the practices of Singapore government in managing its local water resources, i.e. recovery of the polluted water environment in its early years, integrated planning of catchment and reservoirs for stormwater storage, acquiring new resource to supplement and replacing conventional water resource, establishing public outreach network for water demand management and water resource protection, adopting water sensitive urban design to rediscover the added value of water resource to urban development, etc. By reviewing the mechanism of Singapore’s practices on sustainable planning, the existing urban water resources shortage situation in China would be addressed and suggestion for urban water resource sustainable planning and use would also be given.
    ISSN: 1022-6680
    ISSN: 1662-8985
    E-ISSN: 1662-8985
    Source: Alma/SFX Local Collection
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  • 7
    Language: English
    In: Environmental science & technology, 2009-12-15, Vol.43 (24), p.9400-9406
    Description: Nitrite has been commonly recognized as an important factor causing N(2)O production, which weakened the advantages of nitrogen removal via nitrite. To reduce and control N(2)O production from wastewater treatment plants, both long-term and batch tests were carried out to investigate main sources and pathways of N(2)O production during nitrogen removal via nitrite from real domestic wastewater. The obtained results showed that N(2)O production during nitrogen removal via nitrite was 1.5 times as much as that during nitrogen removal via nitrate. It was further demonstrated that ammonia oxidization were main source of N(2)O production during nitrogen removal from domestic wastewater; whereas, almost no N(2)O was produced during nitrite oxidization and anoxic denitrification. N(2)O production during nitrogen removal via nitrite decreased about 50% by applying the step-feed SBR, due to the effective control of nitrite and ammonia, the precursors of N(2)O production. Therefore, the step-feed system is recommended as an effective method to reduce N(2)O production during nitrogen removal via nitrite from domestic wastewater.
    Subject(s): Ammonia - chemistry ; Greenhouse Effect ; Nitrites - chemistry ; Nitrogen - chemistry ; Nitrous Oxide - chemistry ; Oxidation-Reduction ; Sewage - chemistry ; Waste Disposal, Fluid - methods
    ISSN: 0013-936X
    E-ISSN: 1520-5851
    Source: Hellenic Academic Libraries Link
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  • 8
    Language: English
    In: 2011 Asia-Pacific Power and Energy Engineering Conference, 2011-03, p.1-4
    Description: The key of sustainable development of newly urbanized areas often lies in tackling with issues, such as population growth, growing resources constraints, coordination between regional and urban needs, etc. Water, as one of the shared and liquid resources, has been playing a more and more important role in sustainable urban planning nowadays. Conventional water resource planning concept alone, i.e. planning for adequate and reliable water supply, could no long address the growing urbanization needs. Especially in China, water resource management practices are still under the guidance following conventional mindset and compliances. It was yet brought up to people's attention that water resource planning is a crucial element of urban planning, not to mention the effort that should be spent in localized investigating and exploring the potential value of water to economy, esthetics and social development. This paper takes Sino-Singapore Tianjin Eco-city as a case to study its future-ready approach in managing its local water resources under water scarce urban settings, i.e. recovery of the polluted water environments, integrated planning of catchment and reservoirs for stormwater storage, acquiring new resource to supplement and replacing conventional water resource, adopting water sensitive urban design to rediscover the added value of water resource to urban development, establishing PPP network for water demand management and water resource protection, etc. By reviewing Eco-city's strategies on sustainable in-situ water resources planning, the existing urban water resources shortage situation in some of China's coastal water scarce cities would be addressed and suggestion for urban water resource sustainable planning and use would also be given.
    Subject(s): Cities and towns ; Irrigation ; Planning ; Wastewater ; Water conservation ; Water pollution ; Water resources
    ISBN: 9781424462537
    ISBN: 1424462533
    ISSN: 2157-4839
    Source: IEEE Electronic Library (IEL)
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  • 9
    Language: English
    In: Journal of biomedical research, 2015, Vol.29 (6), p.445-450
    Description: Ischemic heart diseases are the leading cause of death with increasing numbers of patients worldwide. Despite advances in revascularization techniques, angiogenic therapies remain highly attractive. Physiological ischemia train- ing, which is first proposed in our laboratory, refers to reversible ischemia training of normal skeletal muscles by using a tourniquet or isometric contraction to cause physiologic ischemia for about 4 weeks for the sake of triggering mole- cular and cellular mechanisms to promote angiogenesis and formation of collateral vessels and protect remote ische- mia areas. Physiological ischemia training therapy augments angiogenesis in the ischemic myocardium by inducing differential expression of proteins involved in energy metabolism, cell migration, protein folding, and generation. It upregulates the expressions of vascular endothelial growth factor, and induces angiogenesis, protects the myocardium when infarction occurs by increasing circulating endothelial progenitor cells and enhancing their migration, which is in accordance with physical training in heart disease rehabilitation. These findings may lead to a new approach of ther- apeutic angiogenesis for patients with ischemic heart diseases. On the basis of the promising results in animal studies, studies were also conducted in patients with coronary artery disease without any adverse effect in vivo, indicating that physiological ischemia training therapy is a safe, effective and non-invasive angiogenic approach for cardiovascular rehabilitation. Preconditioning is considered to be the most protective intervention against myocardial ischemia-reper- fusion injury to date. Physiological ischemia training is different from preconditioning. This review summarizes the preclinical and clinical data of physiological ischemia training and its difference from preconditioning.
    Subject(s): angiogenesis ; ischemia preconditioning ; physiological ischemia training ; Review ; vascular endothelial growth factor ; 心脏病患者 ; 生理性 ; 缺血再灌注损伤 ; 缺血性心脏病 ; 缺血预适应 ; 血管内皮生长因子 ; 血管生成 ; 训练
    ISSN: 1674-8301
    Source: Academic Search Ultimate
    Source: PubMed Central
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  • 10
    Language: English
    In: Soft computing (Berlin, Germany), 2019-06-22, Vol.24 (5), p.3591-3599
    Description: In this paper, we investigate how market instability is formed with investment decision models of heterogeneous agents who are characterized by different selectivities of attention to public information. In the nonlinear dynamic decision model, agents make decisions on trading volume based on their own volume and marginal payoff of the previous period, as well as their selective attention to public information. One goal of this paper is to use the model to explore the condition under which public information could trigger the market instability. A second, related, goal is to study whether there is other investor behavior factor that leads to market instability. We find that some traders’ significant attention to bad news or most traders’ significant attention to good news can lead to market instability. We also find that whole market also may develop into chaos through bifurcation, with increasing relative trading adjustment speed responding to marginal payoff for some traders, although all traders pay no attention to public information. The relative trading adjustment speed responding to marginal payoff is more likely to cause market instability than public information. Our findings reveal an extremely simple stylized fact that market instability always occurs when there is no public information.
    Subject(s): Artificial Intelligence ; Bifurcations ; Computational Intelligence ; Control ; Decision-making ; Engineering ; Mathematical Logic and Foundations ; Mechatronics ; Methodologies and Application ; News ; Nonlinear dynamics ; Robotics ; Stability
    ISSN: 1432-7643
    E-ISSN: 1433-7479
    Source: Alma/SFX Local Collection
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