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Enhanced biological nutrient removal by the alliance of a heterotrophic nitrifying strain with a nitrogen removing ecosystem

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Journal of Environmental Sciences 2008年第2期20卷 216-223页

作者： naeem ud din ahmad XU Haiying CHEN Liping LIU Zhipei LIU Shuangjiang State Key Laboratory of Microbial Resources Institute of Microbiology Chinese Academy of Sciences Beijing 100080 China Graduate School of Chinese Academy of Sciences Beijing 100049 China

Nitrogen removal from synthetic wastewater was investigated in an airlift bioreactor （ALB）, augmented with a novel heterotrophic nitrifier Pseudonocardia ammonioxydans H9^T under organic carbon to nitrogen ratios （Corg/N） ranging from 0 to 12. Effect of the inoculated strain was also determined on the settling properties and the removal of chemical oxygen demand （COD）. Two laboratory scale reactors were set up to achieve a stable nitrifying state under the same physicochemical conditions of hydraulic retention time （HRT）, temperature, pH and dissolved oxygen （DO）, and operated under the sequencing batch mode. The level of DO was kept at 0.5- 1.5 mg/L by periodic stirring and aeration. Each specific Corg/N ratio was continued for duration of 3 weeks. One of the reactors （BR2） was inoculated with P ammonioxydans H9^T periodically at the start of each Corg/N ratio. Sludge volumetric index （SVI） improved with the increasing Corg/N ratio, but no significant difference was detected between the two reactors. BR2 showed higher levels of nitrogen removal with the increasing heterotrophic conditions, and the ammonia removal reached to the level of 82%-88%, up to10% higher than that in the control reactor （BR1） at Corg/N ratios higher than 6; however, the ammonia removal level in experimental reactor was up to 8% lower than that in control reactor at Corg/N ratios lower than 2. The COD removal efficiency progressively increased with the increasing Corg/N ratios in both of the reactors. The COD removal percentage up to peak values of 88%-94% in BR2, up to 11% higher than that in BR1 at Corg/N ratio higher than 4. The peak values of ammonia and COD removal almost coincided with the highest number （18%-27% to total bacterial number） of the exogenous bacterium in the BR2, detected as colony forming units （CFU）. Furthermore, the removal of ammonia and COD in BR2 was closely related to the number of the inoculated strain with a coefficient index （R2） up to 0.82 and 0.85 for ammonia

关键词： air-lift bioreactor (ALB) bioaugrnentation Corg/N ratio COD and ammonia removal sequencing batch mode heterotrophic nitrifier Pseudonocardia ammonioxydans H9^T

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气提式三重循环生物膜反应器处理制药废水中的甾体雌激素

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环境科学研究 2006年第4期19卷 56-60页

作者：崔成武纪树兰任海燕 naeem ud din ahmad 韩磊北京工业大学环境与能源工程学院北京100022 中国科学院微生物研究所北京100080

为验证气提式三重循环生物膜反应器处理甾体雌激素的效能，建立了一套SPE／HPLC／MS／MS分析方法，对反应器进、出水中的甾体雌激素——甾酮（E1），17β-雌二醇（E2），雌三醇（E3）以及17α-乙炔基雌二醇（EE2）进行检测．该方法的加... 详细信息

为验证气提式三重循环生物膜反应器处理甾体雌激素的效能，建立了一套SPE／HPLC／MS／MS分析方法，对反应器进、出水中的甾体雌激素——甾酮（E1），17β-雌二醇（E2），雌三醇（E3）以及17α-乙炔基雌二醇（EE2）进行检测．该方法的加标回收率为88％～103％，精密度为4％～9％．该方法对E1，E2，E3和EE2的进水定量限（LOQ）分别为0．7，0．8，0．9和0．5ng／L；对出水的定量限分别为2．0，1．0，2．0和1．0ng／***和氨氮容积负荷最高为7．5和1．6kg／（m^3·d），出水依然能够保持稳定．进水pH稳定在9．0～10．5，而反应器的pH一直稳定在9．0以下，体系对pH变化造成的冲击比较适应．同时，反应器内形成了稳定的NO2^- -N积累，CODCr和氨氮的去除率分别达到了70％和73％．

关键词：气提式三重循环生物膜反应器 SPE/HPLC/MS/MSW分析方法甾体雌激素短程硝化

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气提式三重循环生物膜反应器用于制药废水的处理

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中国给水排水 2006年第5期22卷 80-83页

作者：任海燕纪树兰崔成武韩磊 naeem ud din ahmad 王道北京工业大学环境与能源工程学院北京100022 中国科学院微生物研究所北京100080

采用气提式三重循环生物膜反应器（TLABR）处理制药废水，稳定阶段对COD和NH4^＋-N的去除率分别为73％和70％。当温度为27～30℃、pH=8．5时，反应器内形成了稳定的NO2^--N积累。同时，考察了不同HRT下高效反应器的处理效果，探讨了pH... 详细信息

采用气提式三重循环生物膜反应器（TLABR）处理制药废水，稳定阶段对COD和NH4^＋-N的去除率分别为73％和70％。当温度为27～30℃、pH=8．5时，反应器内形成了稳定的NO2^--N积累。同时，考察了不同HRT下高效反应器的处理效果，探讨了pH对反应器内发生的短程硝化效果的影响以及亚硝化菌对游离氨浓度的适应性。结果表明：在HRT为3、6、9h下，对COD和氨氮的去除率分别为65．3％、73．9％、75．1％和48．9％、68．4％、72．8％；NO2^--N积累率分别为92．7％、76．2％、69．7％；反应器出水水质稳定，体现了高效性和抗冲击负荷能力。

关键词：制药废水气提式三重循环生物膜反应器甾体雌激素短程硝化

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好氧颗粒污泥的形成机理

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水处理技术 2006年第2期32卷 13-15,19页

作者：崔成武纪树兰高景峰任海燕 naeem ud din ahmad 北京工业大学环境与能源工程学院北京100022 中国科学院微生物研究所北京100080

本文综述了几种比较流行的好氧颗粒污泥的形成机理,并进行了分析讨论。同时,总结了各种条件下形成好氧颗粒污泥的理化特性、培养条件及其形态。

关键词：好氧颗粒污泥污泥形态形成机理理化特性培养条件形态

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Stability analysis of a fractional-order cancer model with chaotic dynamics

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International Journal of Biomathematics 2021年第6期14卷 239-261页

作者： Parvaiz ahmad Naik Jian Zu Mehraj-ud-din Naikt School of Mathematics and Statistics Xi’an Jiaotong University Xi’anShaanxi 710049P.R.China Department of Chemical Engineering College of Engineering Jazan UniversityJazan 45142Saudi Arabia

In this paper,we develop a three-dimensional fractional-order cancer *** proposed model involves the interaction among tumor cells,healthy tissue cells and activated effector *** detailed analysis of the equilibrium points is ***,the existence and uniqueness of the solution are *** fractional derivative is considered in the Caputo *** simulations are performed to illustrate the effectiveness of the obtained theoretical *** outcome of the study reveals that the order of the fractional derivative has a significant effect on the dynamic ***,the calculated Lyapunov exponents give the existence of chaotic behavior of the proposed ***,it is observed from the obtained results that decrease in fractional-order p increases the chaotic behavior of the model.

关键词： Cancer model Caputo fractional derivative chaos stability analysis.

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IoT Devices Authentication Using Artificial Neural Network

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Computers, Materials & Continua 2022年第2期70卷 3701-3716页

作者： Syed Shabih Ul Hasan Anwar Ghani Ikram ud din ahmad Almogren Ayman Altameem Department of Computer Science and Software Engineering International Islamic University Islamabad45000Pakistan Department of Information Technology The University of Haripur22620HaripurPakistan Chair of Cyber Security Department of Computer ScienceCollege of Computer and Information SciencesKing Saud UniversityRiyadh11633Saudi Arabia Chair of Cyber Security Department of Natural and Engineering SciencesCollege of Applied Studies and Community ServicesKing Saud UniversityRiyadh11543Saudi Arabia

User authentication is one of the critical concerns of information *** tend to use strong textual passwords,but remembering complex passwords is hard as they often write it on a piece of paper or save it in their mobile *** passwords are slightly unprotected and are easily *** attacks include dictionary,shoulder surfing,and brute *** passwords overcome the shortcomings of textual passwords and are designed to aid memorability and ease of *** paper proposes a Process-based Pattern Authentication(PPA)system for Internet of Things(IoT)devices that does not require a server to maintain a static password of the login *** server stores user’s information,which they provide at the time of registration,i.e.,the R-code and the symbol,but the P-code,i.e.,the actual password,will change with every login attempt of *** this scheme,users may draw a pattern on the basis of calculation from the P-code and Rcode in the PPA pattern,and can authenticate themselves using their touch dynamic behaviors through Artificial Neural Network(ANN).The ANN is trained on touch behaviors of legitimate users reporting superior performance over the existing *** experimental purposes,PPA is implemented as a prototype on a computer system to carry out experiments for the evaluation in terms of memorability and *** experiments show that the system has an effect of 5.03%of the False Rejection Rate(FRR)and 4.36%of the False Acceptance Rate(FAR),respectively.

关键词： Implicit authentication behavioral authentication artificial neural network processed pattern authentication

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Revalorization of CO2 for methanol production via ZnO promoted carbon nanofibers based Cu-ZrO2 catalytic hydrogenation

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Journal of Energy Chemistry 2019年第12期28卷 68-76页

作者： Israf ud din Maizatul S.Shaharun A.naeem S Tasleem Pervaiz ahmad Department of Chemistry College of Science and HumaniriesPrince Sarttam bin Abdulaziz UniversityAl-kharjSaudi Arabia Department of Fundamental and Applied Sciences Universiti Teknologi PETRONASMalaysia National Centre of Excellence in Physical Chemistry University of PeshawarPakistan Chemistry Department Kohat University of Science and TechnologyKohatPakistan Department of Physics University of Azad Jammu&Kashmir13100 MuzaffarabadPakistan

A series of novel carbon nanofibers(CNFs)based Cu-ZrO2 catalysts were synthesized by deposition precipitation *** investigate the influence of promoter,catalysts were loaded with 1,2,3 and 4 wt%ZnO and characterized by ICP-OES,HRTEM,BET,N2O chemisorption,TPR,XPS and CO2-TPD *** results revealed that physicochemical properties of the catalysts were strongly influenced by incorporation of ZnO to the parent *** surface area(SCu)and dispersion(DCu)were slightly decreased by incorporation of ZnO ***,SCuand DCuwere remarkably decreased when ZnO content was exceeded beyond 3 wt%.The catalytic performance was evaluated by using autoclave slurry reactor at a pressure and temperature of 30 bar and 180℃,*** promotion of CuZrO2/CNFs catalyst with 3 wt%of ZnO enhanced methanol synthesis rate from 32 to 45 g kg^-1 h^-***,with the ZnO promotion the selectivity to methanol was enhanced to 92%compared to 78%of the un-promoted Cu-ZrO2/CNFs catalyst at the expense of a lowered CO2 *** addition,the catalytic activity of this novel catalyst system for CO2 hydrogenation to methanol was compared with the recent literature data.

关键词： Methanol synthesis Slurry reactor Promoter effect Chemisorption studies CNFs CO2 conversion

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Response of Wheat to Tillage Plus Rice Residue and Nitrogen Management in Rice-Wheat System

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Journal of Integrative Agriculture 2014年第11期13卷 2389-2398页

作者： Khalid Usman Ejaz ahmad Khan Niamatullah Khan Abdur Rashid Fazal Yazdan Saleem ud din Department of Agronomy Faculty of Agriculture Gomal UniversityD. I. Khan 29050 Pakistan Cotton Research Station Ratta KulachiD. I. Khan 29050 Pakistan Arid Zone Research Institute Ratta KulachiD. I. Khan 29050 Pakistan Oil Seed Research Program National Agricultural Research CentreIslamabad 44000Pakistan

Zero tillage with residues retention and optimizing nitrogen fertilization are important strategies to improve soil quality and wheat （Triticum aestivum L.） yield in rice （Oryza sativa L.）-wheat system. Field experiments were conducted on silty clay soil （Hyperthermic, and Typic Torrilfuvents） in D. I. Khan, Pakistan, to explore the impact of six tillage methods （zero tillage straw retained （ZTsr）, ZT straw burnt （ZTsb）, reduced tillage straw incorporated （RTsi, including tiller and rotavator）, RT straw burnt （RTsb）, conventional tillage straw incorporated （CTsi, including disc plow, tiller, rotavator, and leveling operations）, CT straw burnt （CTsb）） and ifve nitrogen rates, i.e., 0, 100, 150, 200, and 250 kg ha-1 on wheat yield. Mean values for N revealed that spikes m-2, grains/spike, 1 000-grain weight （g）, and grain yield （kg ha-1） were signiifcantly higher at 200 kg N ha-1 in both the years as well as mean over years than all other treatments. Mean values for tillage revealed that ZTsr produced highest number of spikes m-2 among tillage methods. However, grains/spike, 1 000-grain weight, and grain yield were higher in tillage methods with either straw retained/incorporated than tillage methods with straw burnt. Interaction effects were signiifcant in year 1 and in mean over years regarding spikes m-2, 1 000-grain weight, total soil organic matter （SOM）, and total soil N （TSN）. ZTsr produced the most spikes m-2 and 1 000-grain weight at 200 kg N ha-1. ZTsr also produced higher SOM and TSN at 200-250 kg N ha-1 at the end of 2 yr cropping. Thus ZTsr with 200 kg N ha-1 may be an optimum and sustainable approach to enhance wheat yield and soil quality in rice-wheat system.

关键词： wheat yield tillage nitrogen TSN SOM

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Short Response of Spring Wheat to Tillage, Residue Management and Split Nitrogen Application in a Rice-Wheat System

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Journal of Integrative Agriculture 2014年第12期13卷 2625-2633页

作者： Khalid Usman Ejaz ahmad Khan Fazal Yazdan Niamatullah Khan Abdur Rashid Saleem ud din Department of Agronomy Faculty of Agriculture Gomal UniversityD. I. Khan 29050 Pakistan Oil Seed Research Programme National Agricultural Research Center (NARC) Cotton Research Station Ratta Kulachi D. I. Khan 29050 Pakistan Arid Zone Research Institute Ratta Kulachi D. I. Khan 29050 Pakistan

A ifeld experiment was conducted to study the impact of tillage, crop residue management and nitrogen （N） splitting on spring wheat （Triticum aestivum L.） yield over 2 yr （2010-2012） in a rice （Oryza sativa L.）-wheat system in northwestern Pakistan. The experiment was conducted as split plot arranged in randomized complete blocks design with three replications. Treatments comprised six tillage and residue managements：zero tillage straw retained （ZTsr）, zero tillage straw burnt （ZTsb）, reduced tillage straw incorporated （RTsi）, reduced tillage straw burnt （RTsb）, conventional tillage straw incorporated （CTsi）, and conventional tillage straw burnt （CTsb） as main plots and N （200 kg ha-1） was applied as split form viz., control （no nitrogen＆no splitting, N0S0）;2 splits of total N, half at sowing and half at the 1st irrigation （i.e., 20 d after sowing （DAS））（NS1）;3 splits of total N, 1/3 at sowing, 1/3 at the 1st irrigation, and 1/3 at the 2nd irrigation （NS2）;4 splits of total N, 1/4 at sowing, 1/4 at the 1st irrigation, 1/4 at the 2nd irrigation （45 DAS）, and 1/4 at the 3rd irrigation （70 DAS）（NS3）;and 4 splits of total N, 1/4 at the 1st irrigation, 1/4 at the 2nd irrigation, 1/4 at the 3rd irrigation, and 1/4 at the 4th irrigation （95DAS）（NS4） as sub plots. The results showed that the most pikes m-2, grains/spike, 1 000-grain weight, grain yield, and N use efifciency （NUE） were obtained at zero tillage, straw retained and 4 splits application of total N （i.e., at sowing 20, 45 and 70 d after sowing）. The results indicated that ZTsr with application of 200 kg N ha-1 in 4 equal splits viz. at sowing 20, 45 and 70 d after sowing is an appropriate strategy that enhanced wheat yield （7 436-7 634 kg ha-1） and N efifciency （28.6-29.5 kg kg-1） in rice-wheat system.

关键词： tillage residue management N split application wheat yield

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Antihyperglycemic effect of methanol extract of Tamarix aphylla L. Karst (Saltcedar) in streptozocin–nicotinamide induced diabetic rats

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Asian Pacific Journal of Tropical Biomedicine 2017年第7期7卷 619-623页

作者： rooh ullah shafiq ahmed tariq naeem khan nawaz sharif zia ud din khalid mansoor department of pharmacology institute of basic medical sciences khyber medical university

Objective: To evaluate the antihyperglycemic potential of Tamarix aphylla(T. aphylla)leaves in STZ–NIC induced diabetes in Wister Albino ***: Acute toxicity study was done to check the toxicity of T. aphylla(L. Karst)methanol extract. T. aphylla leaves extract was administered intraperitoneally(100 mg,250 mg and 400 mg/kg body weight per day) to diabetic Wister rats for 21 days. The various parameters were studied including fasting blood glucose levels, haemoglobin and glycosylated ***: The treatment groups with the extract at three dose levels expressively abridged the intensities of blood glucose and Glycosylated Haemoglobin. The earlier detected reduced level of plasma haemoglobin of the diabetic rats was raised to near normalcy with treatment of ***: The results of the current study confirm that the leaves extract of T. aphylla are nontoxic and have antidiabetic nature.

关键词： Tamarix aphylla leaves Diabetes Streptozotocin Antidiabetic potential Insulin secretion

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