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Search Results: 1 - 10 of 27606 matches for " MA Deli "
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Gnedenko-Raikov’s Theorem Fails for Exchangeable Sequences  [PDF]
George Stoica, Deli Li
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.312A277

We study the connection between the central limit theorem and law of large numbers for exchangeable sequences, and provide a counterexample to the Gnedenko-Raikov theorem for such sequences.

Treatment of Acid Red B wastewater by a novel Fenton-like catalyst

Duan Dong,Wu Deli,Ma Luming,

环境工程学报 , 2010,
Abstract: 为了解决Fenton试剂反应前后需要调节pH值、催化剂不能重复利用的问题,本实验以酸性红B溶液作为模拟染料废水,探索以硫铁矿烧渣作为非均相催化剂进行类Fenton反应的催化活性,研究了H2O2投加量、催化剂投加量、pH值、反应时间对酸性红B去除效果的影响。在双氧水(H2O2质量分数为30%)投加量为30 mL/L、催化剂投加量为30 g/L、pH值在1~11范围内,反应4 h,浓度为200 mg/L的酸性红B去除率均达到95%以上,且反应后pH值在中性范围。实验结果表明,该非均相类Fenton反应体系对pH的适用范围广,且催化剂易于沉淀分离,反应数次后依然保持较高催化活性,能重复利用。
Catalytic oxidation of triclosan in water by pyrite and hydrogen peroxide

Feng Yong,Wu Deli,Ma Luming,

环境工程学报 , 2012,
Abstract: The treatment of pollutants through a heterogeneous Fenton-like oxidation process using pyrite catalyst by employing the triclosan as model contaminants as well as the characterization of pyrite using SEM and EDS techniques was investigated.A series of experiments were conducted to elucidate the influence of significant parameters on the oxidation system,such as catalyst dosage,initial H2O2 concentration,initial pH of the reaction medium and reaction time etc.Results indicate that the catalyst shows high activity in terms of triclosan removal.The removal rate of triclosan could be over 90% within 10 min of reaction at pH 8 when the initial concentration of H2O2 and pyrite dosage were 5 mg/L and 0.1 g/L,respectively.The effect of pH on this heterogeneous reaction is much weaker than that on traditional Fenton reagent.And the high activity of catalyst can be kept constant with the pH value ranging from 2 to 10.Reaction intermediates including 2,4-dichlorophen,formed in the degradation of triclosan were identified by GC-MS.
Reductive transformation of hydrophilic azo dye by ferrous hydroxy complex

Feng Yong,Wu Deli,Ma Luming,

环境工程学报 , 2012,
Abstract: 偶氮染料是印染工艺中应用最广泛的一类染料,目前染料废水脱色是污水处理难题。亚铁混凝处理染料废水过程中可能存在亚铁的还原作用,本实验制备了比溶解态亚铁更具还原反应活性的亚铁羟基络合物(ferrous hydroxy complex, FHC),以5种不同类型的水溶性偶氮染料为目标污染物,研究FHC还原水溶性偶氮染料的脱色性能。实验结果表明,FHC对活性艳红X-3B、酸性大红GR和阳离子红X-GRL有较好的还原脱色效果,仅投加含铁89.6 mg/L的FHC,染料脱色率达到90%以上,继续增大FHC投加量可以完全脱色;中性枣红GRL的FHC还原脱色效果较差,需加入313.6 mg/L的FHC才能达到90%以上脱色率;134.4 mg/L的FHC能够将直接耐酸大红4BS完全脱色,但其脱色主要以混凝沉淀为主;溶液pH对FHC的还原性能产生重要影响,FHC还原染料脱色的适宜的pH值范围为4~10。该研究为亲水性染料脱色提供了一种新的技术,也为FHC运用于印染废水脱色提供了理论基础。
Efficacy and safety of peginterferon alfa-2a and ribavirin in patients with chronic hepatitis C virus infection
Deli? Dragan
Medicinski Pregled , 2006, DOI: 10.2298/mpns0610415d
Abstract: Introduction. Chronic hepatitis C remains a formidable threat to world health. Progression of chronic hepatitis C is associated with significant morbidity: cirrhosis, hepatic failure and hepatocellular carcinoma. The introduction of combined therapy with pegylated interferons and ribavirin has increased the sustained virologic response (SVR) in the much higher percentage than with previous treatment options, while the level of adverse effects has not changed significantely. The aim of this study was to assess the efficacy and safety of combined therapy (peginterferon alfa-2a + ribavirin) in Serbian population. Material and methods. Patients with genotypes 1 and 4 received a 48-week course of therapy of peginterferon alfa-2a (180 mg/week) and ribavirin (1000-1200 mg/day). Patients with genotypes 2 and 3 received the same doses of both drugs, but during 24 weeks. All patients were scheduled for follow-up visit 24 weeks after the end of treatment. Physicians were instructed to adjust the dose of both drugs if adverse events occurred. Standard PCR tests were used for qualitative and quantitative detection of viral RNA, as well as for determination of patients' genotypes. Results and discussion. A total of 95 patients were enrolled in the sutdy. The majority of patients were male (65.26%), aged 40 or under (52.63%), with genotype 1 (63.15%). The average duration of infection was 2.81+4.89 years, but still, the majority of patients (51.58%) had HCV infection for less than 2 years. Fibrosis was present in 69.47 % of patients, and cirrhosis in 21.06%. The most common mode of infection was through i.v. drug use (29.48%), but it was unknown in 32.63% of patients. The mean ALT value was 100.44+70.26, with the total of 93.68% of patients having elevated ALT level. At the end of treatment (EoT) time point, data were collected from 66 patients (69.47%), while at the end of follow-up (EoFU), data were collected from 68 patients (71.58%). This unusual drop-out rate of 28.42% was mainly caused by losing contact with patients (14.74%) and premature termination of therapy (13.68%). The primary parameter of efficacy SVR at the EoFU was achieved in 59 out of 68 patients (86.76%), while the secondary efficacy parameter (SVR at the EoT) was achieved in 77.27% of patients. Multiple regression analysis has established the initial level of ALT, patient's age and fibrosis level as main parameters statistically significantly impacting the outcome of treatment. Although without statistical significance, the trend of better outcomes was associated with early therapy (within 2 years
Redox chemistry of molybdenum in natural waters and its involvement in biological evolution
Deli Wang
Frontiers in Microbiology , 2012, DOI: 10.3389/fmicb.2012.00427
Abstract: The transition element molybdenum (Mo) possesses diverse valances (+II to +VI), and is involved in forming cofactors in more than 60 enzymes in biology. Redox switching of the element in these enzymes catalyzes a series of metabolic reactions in both prokaryotes and eukaryotes, and the element therefore plays a fundamental role in the global carbon, nitrogen, and sulfur cycling. In the present oxygenated waters, oxidized Mo(VI) predominates thermodynamically, whilst reduced Mo species are mainly confined within specific niches including cytoplasm. Only recently has the reduced Mo(V) been separated from Mo(VI) in sulfidic mats and even in some reducing waters. Given the presence of reduced Mo(V) in contemporary anaerobic habitats, it seems that reduced Mo species were present in the ancient reducing ocean (probably under both ferruginous and sulfidic conditions), prompting the involvement of Mo in enzymes including nitrogenase and nitrate reductase. During the global transition to oxic conditions, reduced Mo species were constrained to specific anaerobic habitats, and efficient uptake systems of oxidized Mo(VI) became a selective advantage for current prokaryotic and eukaryotic cells. Some prokaryotes are still able to directly utilize reduced Mo if any exists in ambient environments. In total, this mini-review describes the redox chemistry and biogeochemistry of Mo over the Earth’s history.
Effective Capacity of Buffer-Aided Full-Duplex Relay Systems with Selection Relaying
Deli Qiao
Mathematics , 2015,
Abstract: In this work, the achievable rate of three-node relay systems with selection relaying under statistical delay constraints, imposed on the limitations of the maximum end-to-end delay violation probabilities, is investigated. It is assumed that there are queues of infinite size at both the source and relay node, and the source can select the relay or destination for data reception. Given selection relaying policy, the effective bandwidth of the arrival processes of the queue at the relay is derived. Then, the maximum constant arrival rate can be identified as the maximum effective capacity as a function of the statistical end-to-end queueing delay constraints, signal-to-noise ratios (SNR) at the source and relay, the fading distributions of the links, and the relay policy. Subsequently, a relay policy that incorporates the statistical delay constraints is proposed. It is shown that the proposed relay policy can achieve better performance than existing protocols. Moreover, it is demonstrated that buffering relay model can still help improve the throughput of relay systems in the presence of statistical delay constraints and source-destination link.
Achievable Rate of Two-Hop Channels under Statistical Delay Constraints
Deli Qiao
Mathematics , 2014,
Abstract: This paper analyzes the impact of statistical delay constraints on the achievable rate of a two-hop wireless communication link, in which the communication between a source and a destination is accomplished via an intermediate full-duplex relay node. It is assumed that there is no direct link between the source and the destination, and the relay forwards the information to the destination by employing the decode-and-forward scheme. Both the queues at the source and relay node are subject to statistical queueing constraints imposed on the limitations of buffer violation probability. Given statistical delay constraints specified via maximum delay and delay violation probability, the tradeoff between the statistical delay constraints imposed to any two concatenated queues is identified. With this characterization, the maximum constant arrival rates that can be supported by this two-hop link are obtained by determining the effective capacity of such links as a function of the statistical delay constraints and signal-to-noise ratios (SNR) at the source and relay, and the fading distributions of the links. It is shown that imposing unbalanced statistical delay constraints to the queues at the source and relay can improve the achievable rate. Overall, the impact of statistical delay constraints on the achievable throughput is provided.
Convex and Concave Soft Sets and Some Properties
Irfan Deli
Mathematics , 2013,
Abstract: In this study, after given the definition of soft sets and their basic operations we define convex soft sets which is an important concept for operation research, optimization and related problems. Then, we define concave soft sets and give some properties for the concave sets. For these, we will use definition and properties of convex-concave fuzzy sets in literature. We also give different some properties for the convex and concave soft sets.
Interval-valued neutrosophic soft sets and its decision making
Irfan Deli
Mathematics , 2014, DOI: 10.1007/s13042-015-0461-3
Abstract: In this paper, the notion of the interval valued neutrosophic soft sets ($ivn-$soft sets) is defined which is a combination of an interval valued neutrosophic sets \cite{wan-05} and a soft sets \cite{mol-99}. Our $ivn-$soft sets generalizes the concept of the soft set, fuzzy soft set, interval valued fuzzy soft set, intuitionistic fuzzy soft set, interval valued intuitionistic fuzzy soft set and neutrosophic soft set. Then, we introduce some definitions and operations on $ivn-$soft sets sets. Some properties of $ivn-$soft sets which are connected to operations have been established. Also, the aim of this paper is to investigate the decision making based on $ivn-$soft sets by level soft sets. Therefore, we develop a decision making methods and then give a example to illustrate the developed approach.
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