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Optimization and modeling of coagulation-flocculation to remove algae and organic matter from surface water by response surface methodology

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Frontiers of Environmental Science & Engineering 2019年第5期13卷 115-127页

作者： Ziming Zhao Wenjun Sun Madhumita BRay ajay k Ray Tianyin Huang Jiabin Chen School of Environment Tsinghua UniversityBeijing 100084China Department of Chemical and Biochemical Engineering Western UniversityLondon Ontario N6A 5B9Canada Research Institute for Environmental Innovation(Suzhou) Tsinghua UniversitySuzhou 215163China School of Environmental Science and Engineering Suzhou University of Science and TechnologySuzhou 215009China

Seasonal algal blooms of Lake Yangcheng highlight the necessity to develop an effective and optimal water treatment process to enhance the removal of algae and dissolved organic matter (DOM). In the present study, the coagulation performance for the removal of algae, turbidity, dissolved organic carbon (DOC) and ultraviolet absorbance at 254 nm (UV254) was investigated systematically by central composite design (CCD) using response surface methodology (RSM). The regression models were developed to illustrate the relationships between coagulation performance and experimental variables. Analysis of variance (ANOVA) was performed to test the significance of the response surface models. It can be concluded that the major mechanisms of coagulation to remove algae and DOM were charge neutralization and sweep flocculation at a pH range of 4.66–6.34. The optimal coagulation conditions with coagulant dosage of 7.57 mg Al/L, pH of 5.42 and initial algal cell density of 3.83 × 106 cell/mL led to removal of 96.76%, 97.64%, 40.23% and 30.12% in term of cell density, turbidity, DOC and UV254 absorbance, respectively, which were in good agreement with the validation experimental results. A comparison between the modeling results derived through both ANOVA and artificial neural networks (ANN) based on experimental data showed a high correlation coefficient, which indicated that the models were significant and fitted well with experimental results. The results proposed a valuable reference for the treatment of algae-laden surface water in practical application by the optimal coagulation-flocculation process.

关键词： Algae Coagulation-flocculation Response surface methodology Artificial neural networks

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Skull metastasis in papillary carcinoma of thyroid:A case report

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World Journal of Radiology 2012年第6期4卷 286-290页

作者： Akshay Nigam ajay k Singh Sanjeev k Singh Neelima Singh Department of Radiation Oncology Gajra Raja Medical College and Jaya Arogya Group of HospitalsGwalior 474001Madhya PradeshIndia Department of Biochemistry Gajra Raja Medical College and Jaya Arogya Group of HospitalsGwalior 474001Madhya PradeshIndia

Papillary thyroid carcinoma with metastasis to the skull is extremely *** report a case of unsuspected papillary thyroid carcinoma with skull metastasis.A 48-year-old female patient presenting with painless,pulsatile,progressively increasing swelling in the occipitoparietal region of the scalp approached for an X-ray of the *** of palpable swelling in the neck revealed a heteroechoic lesion with increased *** of calcification were seen involving both lobes of the *** of scalp showed a destructive mass in the skull with increased *** of thyroid lesions revealed branching papillae having a dense fibrovascular core covered by cuboidal epithelial cells with nuclei having a clear ground glass *** case illustrates how isolated extensive skull metastasis can be found in papillary carcinoma patients without causing significant ***,in the clinical course of thyroid papillary carcinoma,skull metastasis should be considered,and the patients should be meticulously investigated and followed up.

关键词： Papillary thyroid carcinoma Skull metastasis Biopsy

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On Channel Estimation of OFDM-BPSk and -QPSk over Generalized Alpha-Mu Fading Distribution

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International Journal of Communications, Network and System Sciences 2010年第4期3卷 380-384页

作者： Neetu Sood ajay k. Sharma Moin Uddin 不详

This paper evaluates the performance of OFDM-BPSk and -QPSk system in α-μ distribution. A fading model which is based on the non-linearity present in the propagation medium is utilized here for generation of α-μ variants. Different combinations of α and μ provides various fading distributions, one of which is Weibull fading. Investigations of channel estimation schemes gave an idea of further reducing the BER as to improve the performance of OFDM based systems. In flat fading environment, channel estimation is done using phase estimation of the transmitted signal with the help of trained symbols. Final results show the improvement in BER. However, the amount of results improved depends upon the amount of trained symbols. The more trained symbols will result into more improved BER.

关键词： OFDM Fading Distribution Weibull Fading Nakagami Fading Channel Estimation Training Symbols

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Multidisciplinary approach in child and adolescent depression: Experience from a tertiary mental health institution in India

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Open Journal of Psychiatry 2013年第3期3卷 8-14页

作者： Deepak kumar Uday k. Sinha Amit khanna Sujit kumar kar Department of Clinical Psychology Institute of Human Behaviour and Allied Sciences Delhi India Department of Psychiatry Institute of Human Behaviour and Allied Sciences Delhi India

The concept of Multidisciplinary approach is not new to Medical Science. It is an evolving concept that is widely appreciated and adopted in most of the disciplines of medicine. It’s rational and applicable in the management of Child and Adolescent Depression,which needs to be revisited focusing on the interplay of various contextual factors that are entwined and tend to affect the course of the illness. The limitations of any one mental health professional in envisioning all possible dimensions of Child and Adolescent Depression make this approach all the more important wherein Psychiatrists, Clinical Psychologists, Psychiatric Social Workers collaborate with each other and other allied professionals in the treatment and management of the disorder. India, being a heavily populated country, where multidisciplinary management approach is in a phase of expansion and is practiced in many leading institutes to meet the quality needs of patients. This article focuses on the Indian scene of multidisciplinary management approach in child and adolescent depression.

关键词： Child and Adolescent Depression Multidisciplinary Approach Indian Scene

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EFFECT OF FEEDING CHAFFED DRY FODDER ON METHANE EMISSION FROM ADULT RUMINANTS

EFFECT OF FEEDING CHAFFED DRY FODDER ON METHANE EMISSION FRO...

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第三届国际甲烷与氧化亚氮减排技术大会

作者： ajay k Srivastava M R Garg Scientist Productivity Enhancement GroupNational Dairy Development Board

Effect of feeding chaffed paddy straw on methane emission was measured in adult ruminants using sulfur hexaluforide tracer *** adults crossbred cattle of *** and half years of age,were divided into two groups of four *** body weight of animals in control and experimental groups were212±20.79 and 209±28.14 kg *** under control group were offered un-chaffed paddy straw,whereas experimental group was offered chaffed(2-3 inch)paddy straw ad *** addition to this,animals of both the groups were fed 1 kg balanced cattle feed and 50 g mineral mixture per head per *** a feeding trial period of 40 days,breath samples for forty-eight days were collected in two phases for measurement of methane *** phase consisted of three days sample *** DMI(kg)in control and experimental animals was 5.66±0.09 and 7.04±0.03 kg whereas;average DOMI(kg)was 2.44±0.01 and 2.95±0.011kg respectively,which was significantly different(pkg DOMI)in control and experimental group was in the range of 37.12±2.31 to 44.39±1.92(average 39.81±2.55)and 31.65±1.03 to 38.02±0.78(average 35.09±1.82)respectively,which was significantly different(pkg DOMI)reduced 11.76±1.85 per cent on feeding chaffed paddy *** methane loss as percent gross energy intake(GEI)in control and experimental animals was 5.83±0.37&5±0.26respectively,which was significantly different at 5%level(p<0.05).Methane loss as%GEI reduced in experimental group by 14.33±2.09%.Methane emission is an energy loss to the animals,besides a green house *** present study shows that on chaffing of dry fodder,methane emission could be reduced by 11.76±1.85%,which is important for envi

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新能源节能动力汽车及电工电子设计研发

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中国科技论坛 2007年第12期 46-49页

作者：陈丁跃陈李昊 ajay k.Agrawal 长安大学汽车学院陕西西安710064 西北大学陕西西安710069 美国Alabama大学美国al35487

本文介绍了新能源节能动力汽车及电工电子设计研发,从汽车电工电子设计技术等方面较深入地探讨了汽车节能的方法,论述了研发新能源节能动力汽车与技术动向。相信未来有更节能、更环保、更先进的动力机汽车出现。

关键词：汽车节能电工电子设计新能源

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Multivariate q-Bernstein-Schurer-kantorovich Operators

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Journal of Mathematics and System Science 2016年第6期6卷 234-241页

作者： D. k. Vishwakarma Artee Alok kumar ajay kumar Department of Computer Science Dev Sanskriti Vishwavidyalaya Haridwar-2 49411 Uttarakhand India. Department of Mathematics Motilal Nehru National Institute of Technology Allahabad-211004 U.P. India.

The purpose of this paper is to construct a multivariate generalization of a new kind of kantorovich type q-Bernstein-Schurer operators. First, we establish the moments of the operators and then prove the rate of convergence by using the modulus of continuity. Finally, we obtain the degree of approximation by means of Lipschitz type class.

关键词： q-Bernstein-Schurer-kantorovich operators rate of convergence modulus of continuity Lipschitz type class multivariate operators.

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The Effect of Water Absorption on Mechanical Properties of Wood Flour/Wheat Husk Polypropylene Hybrid Composites

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Materials Sciences and Applications 2012年第5期3卷 317-325页

作者： Pradeep Upadhyaya Manoj Garg Vijai kumar ajay k. Nema Central Institute of Plastic Engineering and Technology Bhopal India Central Institute of Plastic Engineering and Technology Lucknow India

The main objectives of this research were to study the effect of water absorption on mechanical properties of hybrid fiber reinforcement for polypropylene composites. The poor resistance towards water absorption is one of the draw- backs of natural fibers. Hybrid filler-polypropylene composites are subjected to water immersion tests in order to study the effects of water absorption on the mechanical properties. Composites specimens containing 30 phr and 40 phr fiber weight were prepared by melt blending process. Water absorption tests were conducted by immersion specimens in distilled water at room temperature for different time durations (24, 48, 72, 96, 120, 144, 168, 192 hours). The tensile, flexural and impact properties were investigated before and after water absorption. The percentage of moisture uptake increased as the increasing order of the filler loading due to the high cellulose content. The phase morphology of wood flour/wheat husk polypropylene hybrid composites were investigated by SEM, the dynamic mechanical properties of the composite are analyzed by DMA & wheat, wood filler interaction are analyzed by FT-IR.

关键词： Hybrid Polypropylene Composites Water Absorption Mechanical Properties

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使用从灰霉菌PPHRI-4 NFCCI-3027中提取的原纤维素酶和木聚糖酶对静电复印废纸进行酶脱墨

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中国造纸 2015年第4期 75-76页

作者： PUNEET PATHAk NISHI k BHARDWAJ ajay k SINGH

本实验对使用从灰霉菌中提取的原纤维素酶和木聚糖酶对静电复印废纸进行脱墨的潜在应用进行了研究。实验考察了酶的添加点、用量、浆浓和反应时间,以期在不影响纸张强度性能的前提下获得最大可能的脱墨效率。结果表明,当使用100%的静电... 详细信息

本实验对使用从灰霉菌中提取的原纤维素酶和木聚糖酶对静电复印废纸进行脱墨的潜在应用进行了研究。实验考察了酶的添加点、用量、浆浓和反应时间,以期在不影响纸张强度性能的前提下获得最大可能的脱墨效率。结果表明,当使用100%的静电复印废纸时,酶脱墨比化学脱墨有更好的脱墨效率(+25.4%)、更高的亮度(+5.2%)、耐破指数(+23.9%)和耐折度(+15.9%)。另外酶脱墨的浆料打浆度提高19.6%,滤水时间减少17.3%。该酶的脱墨效率及打浆度达到商业纤维素酶的效果,但强度性能和亮度均显著改善。本实验取得的脱墨效率(95.2%)和其他使用100%的静电复印废纸的研究结果相当,但打浆度比以前使用100%静电复印废纸和办公室混合废纸的相关研究显著提高。实验还取得了使用酶进行脱墨所预期的低废水负荷。综上所述,从灰霉菌中所提取的原酶用于静电复印废纸脱墨的潜在应用得到了确认。

关键词：纤维素酶木聚糖酶灰霉菌脱墨滤水性复印废纸

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Biotoxicity of CdS/CdSe Core-Shell Nano-Structures

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Advances in Nanoparticles 2016年第1期5卷 1-8页

作者： Sreenu Bhanoth Anuraj S. kshirsagar Pawan k. khanna Aakriti Tyagi Anita k. Verma Nanochemistry R & D Lab Department of Applied Chemistry Defence Institute of Advanced Technology (DIAT) Ministry of Defence Government of India Girinagar Pune-411 021 India Nano Bio-Tech Lab Department of Zoology Kirorimal College University of Delhi Delhi India

The cytotoxicity of hydrophobic QDs CdS/CdSe was tested assigning MTT assay on Human Embryonic kidney cells (HEk-293), breast cancer cells (MCF-7) and Enrichlish Ascitices Cells (EAC). Approximately 65% bio-toxicity was observed in MCF-7 for the core-shell QDs. These QDs may also find effective applications in other optoelectronic devices. CdS/CdSe core-shell hetrostructure quantum dots (QDs) were generated by chemical reaction between the respective chalcogens and cadmium metal salt. Sulphur powder was utilized for CdS core preparation while selenium was extracted from an organoselenium compound to impart CdSe shell layer at a temperature between 150℃ - 200℃. So-prepared core-shell QDs showed good optical properties. The particle size was found to be in the range of 3 - 4 nm with spherical morphology and cubic crystal structure.

关键词： Quantum Dots Metal Chalcogenides Bio-Toxicity Cell Lines

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