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Surface Analysis of Carbon Steel Protected from Corrosion by a New Ternary Inhibitor Formulation Containing Phosphonated glycine, Zn<sup>2+</sup>and Citrate

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Journal of Surface Engineered Materials and Advanced Technology 2013年第1期3卷 28-42页

作者： Boyapati Venkata Appa rao Madala venkateswara rao Sirugudu Srinivasa rao Bojja Sreedhar Department of Chemistry Andhra Loyola College Vijayawada India Department of Chemistry National Institute of Technology Warangal India Department of Chemistry V. R. Siddhartha Engineering College Vijyawada India Inorganic & Physical Chemistry Division Indian Institute of Chemical Technology Hyderabad India

Studies on surface analysis of carbon steel protected from corrosion in low chloride and nearly neutral aqueous environment by a synergistic mixture containing N,N-bis(phosphonomethyl) glycine (BPMg), zinc ions and citrate ions are presented. The effect of addition of citrate to the binary system, BPMg-Zn2+, is quite significant and is well explored through various studies. The surface protective nature is maintained in the pH range 5 - 9. Potentiodynamic polarization studies inferred that the ternary inhibitor is a mixed inhibitor. Impedance studies of the metal/solution interface indicated that the surface film is highly protective against the corrosion of carbon steel in the chosen environment. X-ray photoelectron spectroscopic (XPS) analysis of the surface film showed the presence of the elements namely iron, phosphorus, nitrogen, carbon, oxygen and zinc. Deconvolution spectra of these elements in the surface film inferred the presence of oxides/hydroxides of iron(III), Zn(OH)2 and [Fe(III), Zn(II)-BPMg-citrate] heteropolynuclear multiligand complex. This inference is further supported by the reflection absorption Fourier transform infrared spectrum of the surface film. Analysis by scanning electron microscopy (SEM) is presented for both the corroded and protected metal surfaces. Based on all these results, a plausible mechanism of corrosion inhibition is proposed.

关键词： Carbon Steel Corrosion Inhibitor Protective Film Synergism BPMg Citrate

Performance evaluation of the incorporation of different wire meshes in between perforated current collectors and membrane electrode assembly on the Passive Direct methanol fuel cell

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Chinese Journal of Chemical Engineering 2021年第4期34卷 360-367页

作者： Muralikrishna Boni S.Srinivasa rao g.Naga Srinivasulu Department of Mechanical Engineering National Institute of Technology WarangalWarangalTelanganaIndia

Passive Direct methanol fuel cells(DMFC)are more suitable for charging small capacity electronic *** passive DMFC,the fuel and oxidant are supplied by diffusion and natural convection process on the anode and cathode sides *** collectors(CC)play a vital importance in fuel cell *** paper presents the combined impact of perforated and wire mesh current collectors(WMCC)on passive DMFC *** types of open ratios of perforated current collectors(PCC),such as 45.40%,55.40%and 63.40%and two types of wire mesh current collectors with open ratios of 38.70%and 45.40%were chosen for the experimental work.A combination of TaguchiL9 rule is considered.A combination of three PCC and two WMCC on both anode and cathode was *** concentration was varied from 1 mol·L^(-1)-5 mol·L^(-1)for nine combinations of PCC and *** the experimental results,it is noticed that the combination of PCC and WMCC with an open ratio of 55.40%and 38.70%incorporated passive DMFC produced peak power density at 5 mol·L^(-1)of methanol *** passive DMFC performance was evaluated in terms of maximum power density and maximum current *** combined current collectors of PCC and WMCC open ratios of 55.40%+38.70%have more stable voltage than single PCC of open ratio 63.40%at 4 mol·L^(-1)of methanol concentration.

关键词： Passive DMFC Perforated current collector Wire mesh current collector Methanol concentration Fuel cell performance

Iron and Nitrogen containing Carbon Catalysts with Enhanced Activity for Oxygen Reduction in Proton Exchange Membrane Fuel Cells

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Open Journal of Physical Chemistry 2011年第1期1卷 11-22页

作者： Chitturi venkateswara rao Lingam Hima Kumar Balasubramanian Viswanathan 不详

Iron and nitrogen containing carbon catalysts were prepared by the pyrolysis of iron (III) tetramethoxyphenylporphyrin complex adsorbed on as-received as well as nitric acid treated carbon black and employed them as oxygen reduction electrodes for hydrogen-oxygen PEM fuel cells. The influence of carbon surface functional groups on the dispersion of active species and electrocatalytic performance is investigated using electron microscopic and electrochemical techniques. The existence of quinone functional groups on the nitric acid treated carbon was evident from X-ray photoelectron spectroscopy and cyclic voltammetry. Rotating disk electrode voltammetry results affirmed the good electrocatalytic activity and stability of pyrolyzed macrocyclic complex adsorbed on nitric acid treated carbon compared to that of as-received carbon. This is ascribed to the greater number of Fe/N active species as well as good dispersion of metal clusters over nitric acid treated carbon support. Fuel cell tests depicted the comparable performance of pyrolyzed complex adsorbed on nitric acid treated carbon with commercial Pt/C at 353 K. Durability measurements performed under fuel cell operating conditions for 120 h indicate the good stability of the catalysts.

关键词： Iron-Based Clusters Non-Precious Catalysts Oxygen Reduction PEM fuel Cells

Evaluation of Brazilian wild Hevea germplasm for cold tolerance：genetic variability in the early mature growth

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Journal of Forestry Research 2016年第4期27卷 755-765页

作者： g.Prabhakara rao P.C.Kole Rubber Research Institute of India KottayamKerala 686009India Institute of Agriculture Visva-Bharati UniversitySantiniketanWest Bengal 7211235India

Hevea brasiliensis is a commercially cultivated species for its natural rubber（NR） latex in South East Asian countries. To meet the ever-increasing demand, NR cultivation has been extended to non-traditional regions due to the limited scope of further expansion in traditional rubbergrowing areas in India. These areas are often confronted with various abiotic stresses, especially high and low temperatures, which cause reduction in plant growth, thereby increasing its uneconomical immaturity period. Eighteen wild Hevea accessions along with two modern clones RRII203 and PB 235 and two check clones RRIM 600 and Haiken 1 were evaluated in the early mature growth *** site was at Nagrakata, West Bengal, the sub-Himalayan cold-prone region of India. In Hevea, crop production is governed by two major factors, growth-vigor and production capacity. growth-vigor is of special importance because the production of rubber is a process linked with the early growth of the plant, which results in early tappability and early economic gains. The genotypes exhibited highly significant clonal differences（P = 0.05） for all the growth traits. Tappability percentage in the seventh year, ranged from 0.33 %（AC 3074, AC 3075, AC 3293） to 89.67 %（RO 2727）. The most vigorously growing accession（RO2727） reached tappabile girth early in the seventh year when the girth of plant ranged from 22.38 cm（AC 3293） to53.12 cm（RO 2727）. The general mean was 43.32 cm, and the similar growth trend was exhibited by these accessions in the tenth year also. Annual girth increment（cm a-1） over3 years ranged from 1.81 cm（AC 3075） to 6.80 cm（RO2727）. The mean winter girth increment（cm a-1） over4 years ranged from 0.13 cm（AC 3075） to 0.96 cm（RO2727） as compared to the check clone RRIM 600（1.11 cm）and Haiken 1（1.10 cm）. Wide differences between the phenotypic coefficient of variation（50.29） and genotypic coefficient of variation（24.82） were observed for winter girth increment. girth in the tenth year recorded

关键词： Hevea germplasm mature cultivated phenotypic ranged abiotic rubber accession breeding

Influence of bio-inspired flow channel designs on the performance of a PEM fuel cell

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Chinese Journal of Chemical Engineering 2020年第3期28卷 824-831页

作者： Srinivasa Reddy Badduri g.Naga Srinivasulu S.Srinivasa rao Department of Mechanical Engineering NITWarangalTelangana 506004India

Performance of the proton exchange membrane fuel cell(PEMFC)is appreciably affected by the channel *** branching structure of a plant leaf and human lung is an efficient network to distribute the nutrients in the respective *** same nutrient transport system can be mimicked in the flow channel design of a PEMFC,to aid even reactant distribution and better water *** this work,the effect of bio-inspired flow field designs such as lung and leaf channel design bipolar plates,on the performance of a PEMFC was examined experimentally at various operating conditions.A PEMFC of 49 cm2 area,with a Nafion 212 membrane with a 40%catalyst loading of 0.4 mg·cm-2 on the anode side and also 0.6 mg·cm-2 on the cathode side is assembled by incorporating the bio-inspired channel bipolar plate,and was tested on a programmable fuel-cell test *** impact of the working parameters like reactants’relative humidity(RH),back pressure and fuel cell temperature on the performance of the fuel cell was examined;the operating pressure remains constant at 0.1 *** was observed that the best performance was attained at a back pressure of 0.3 MPa,75°C operating temperature and 100%*** three flow channels were also compared at different operating pressures ranging from 0.1 MPa to 0.3 MPa,and the other parameters such as operating temperature,RH and back pressure were set as 75°C,100%and 0.3 *** experimental outcomes of the PEMFC with bio-inspired channels were compared with the experimental results of a conventional triple serpentine flow *** was observed that among the different flow channel designs considered,the leaf channel design gives the best output in terms of power ***,the experimental results of the leaf channel design were compared with those of the interdigitated leaf channel *** PEMFC with the interdigitated leaf channel design was found to generate 6.72%more power density than the non-interdigitated leaf channel design.

关键词： PEMFC Interdigitated leaf channel design Bio-inspired flow field design Operating temperature Relative humidity

二甲双胍胃肠道不良反应及其新型缓释制剂的临床应用

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中华糖尿病杂志 2024年第7期16卷 827-831页

作者：饶翀崔丽梅肖新华清华大学附属垂杨柳医院内分泌科北京100022 中国医学科学院、北京协和医院内分泌科、国家卫生健康委员会内分泌重点实验室北京100730

二甲双胍广泛应用于2型糖尿病(T2DM)的治疗。二甲双胍的胃肠道反应较为常见,其确切机制尚不明确,可能与其转运蛋白、增加肠道内葡萄糖摄取及乳酸水平、增加肠内胆汁酸池、肠道菌群等相关。二甲双胍缓释片与二甲双胍速释片降糖疗效类似,... 详细信息

二甲双胍广泛应用于2型糖尿病(T2DM)的治疗。二甲双胍的胃肠道反应较为常见,其确切机制尚不明确,可能与其转运蛋白、增加肠道内葡萄糖摄取及乳酸水平、增加肠内胆汁酸池、肠道菌群等相关。二甲双胍缓释片与二甲双胍速释片降糖疗效类似,同时能有效减少胃肠道反应的发生。二甲双胍缓释片的制作工艺主要包括羟丙基甲基纤维素(HPMC)凝胶骨架结构、微孔或单孔渗透泵技术及胃漂浮技术。该文就二甲双胍胃肠道反应及相关机制研究、二甲双胍缓释片的种类、二甲双胍缓释片与二甲双胍速释片疗效对比等进行阐述。

关键词：糖尿病,2型二甲双胍缓释片不良反应

Need for operational simplicity and timely disbursal of benefits—a qualitative exploration of the implementation of a direct benefit transfer scheme for persons with tuberculosis in India

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Infectious Diseases of Poverty 2024年第3期13卷 58-72页

作者： Malu Mohan Jeromie W.V.Thangaraj Sumit Pandey g.Sri Lakshmi Priya Sivavallinathan Arunachalam Rahul Sharma Hemant Deepak Shewade B.Aishwarya K.Afeeq Afsana Khatoon B.gokulvijay gude Sireesha Kavita Chandra S.Nandhakumar Prince Samuel C.Nanditha Viswanathan Devika Shanmugasundaram Raghuram rao Manoj V.Murhekar Kathiresan Jeyashree Indian Council of Medical Research-National Institute of Epidemiology R-127TNHBAyapakkamChennaiTamil Nadu 600077India TB Support Network WHO Country Office for IndiaNew DelhiIndia Central Tuberculosis Division Government of IndiaNew DelhiIndia

Background Ni-kshay Poshan Yojana(NPY)is a direct benefit transfer scheme of the government of India introduced in 2018 to support the additional nutritional requirements of persons with TB(PwTB).Our recent nationwide evaluation of implementation and utilization of NPY using programmatic data of PwTB from nine randomly selected Indian states,reported a 70%coverage and high median delay in benefit *** undertook a qualitative study between January and July 2023,to understand the detailed implementation process of NPY and explore the enablers and barriers to effective implementation and utilization of the NPY *** We followed a grounded theory approach to inductively develop theoretical explanations for social phenomena through data generated from multiple *** conducted 36 in-depth interviews of national,district and field-level staff of the National Tuberculosis Elimination Programme(NTEP)and NPY beneficiaries from 30 districts across nine states of India,selected using theoretical *** analytical framework developed through inductive coding of a set of six interviews,guided the coding of the subsequent *** and themes emerged through constant comparison and the data collection continued until theoretical *** Stakeholders perceived NPY as a beneficial *** political commitment from the state administration,mainstreaming of NTEP work with the district public healthcare delivery system,availability of good geographic and internet connectivity and state-specific grievance redressal mechanisms and innovations were identified as enablers of ***,the complex,multi-level benefit approval process,difficulties in accessing banking services,perceived inadequacy of benefits and overworked human resources in the NTEP were identified as barriers to implementation and *** The optimal utilization of NPY is enabled by strong political commitment and challenged by its length

关键词： National Tuberculosis Elimination Programme Nutritional status Direct benefit transfer Implementation Cash transfer scheme grounded theory India

Non-spherical aluminum nanoparticles fabricated using picosecond laser ablation

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International Journal of Minerals,Metallurgy and Materials 2020年第7期27卷 980-986页

作者： A.Brahma Swamulu S.Venugopal rao g.Krishna Podagatlapalli Department of Physics Rajiv Gandhi University of Knowledge TechnologiesNuzvidAndhra Pradesh 521202India Advanced Centre of Research in High Energy Materials(ACRHEM) University of HyderabadHyderabad 500046TelanganaIndia Department of Electronics&Physics Gandhi Institute of Technology and Management Institute of ScienceGandhi Institute of Technology and Management deemed to be UniversityVisakhapatnam 530045Andhra PradeshIndia

We report the picosecond laser ablation of aluminum targets immersed in a polar organic liquid(chloroform,CHCl3)with^2 ps laser pulses at an input energy of^350μ*** synthesized aluminum nanoparticles exhibited a surface plasmon resonance peak at^340 *** electron microscopy images of Al nanoparticles demonstrated the spherical morphology with an average size of(27±3.6)*** formation of smaller spherical Al nanoparticles and the diminished growth could be from the formation of electric double layers on the Al *** addition to spherical aluminum nanoparticles,triangular/pentagonal/hexagonal nanoparticles were also observed in the colloidal *** emission scanning electron microscopy images of ablated Al targets demonstrated laser induced periodic surface structures(LIPSSs),which were the high spatial frequency LIPSSs(HSF-LIPSSs)since their grating period was^280 ***,coarse structures with a period of^700 nm were observed.

关键词： ablation picosecond silver polar periodic surfaces electric double layers

代谢工程改造大肠杆菌从头合成1,4-丁二醇

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生物工程学报 2024年第9期40卷 3142-3157页

作者：姜君逸郭艺鸣杨套伟饶志明江南大学工业生物技术教育部重点实验室江苏无锡214122 江南大学生物工程学院江苏无锡214122

1,4-丁二醇是一种重要的中间体,广泛应用于化工、农业、医药等领域。本研究将酶工程和代谢工程相结合,构建了一条以葡萄糖为底物生产1,4-丁二醇的新途径。首先,通过数据库挖掘设计了一条包含α-酮酸脱羧酶(α-ketoglutarate decarboxyla... 详细信息

1,4-丁二醇是一种重要的中间体,广泛应用于化工、农业、医药等领域。本研究将酶工程和代谢工程相结合,构建了一条以葡萄糖为底物生产1,4-丁二醇的新途径。首先,通过数据库挖掘设计了一条包含α-酮酸脱羧酶(α-ketoglutarate decarboxylase,SucA)、羧酸还原酶(carboxylate reductase,Car)、乙醇脱氢酶(alcohol dehydrogenase,YqhD)的新型催化途径,引入底盘细胞W3110(K-12)后,实现了1,4-丁二醇的从头合成。为进一步提高该路径的合成效率,敲除了乳酸脱氢酶(lactate dehydrogenase A,LdhA)、丙酮酸甲酸裂解酶(pyruvate formate lyase B,PflB)基因,阻断旁路代谢途径;强化表达柠檬酸合酶(citrate synthase,gltA^(R163L)),增加α-酮戊二酸代谢通量;强化底盘细胞中关键辅酶NADPH合成量并替换强启动子强化sucA、car、yqhD基因表达量,改善了1,4-丁二醇合成前体的供给效率。最终,重组菌株摇瓶发酵48 h最高合成770 mg/L的1,4-丁二醇,在5 L发酵罐上发酵60 h,1,4-丁二醇产量达4.22 g/L,得率为12.46 mg/g葡萄糖。本研究设计了一条新的1,4-丁二醇从头合成路径,与已报道的路径相比,该路径无需乙酰辅酶A参与,避免了副产物乙酸的积累,同时避免了氨的添加,为代谢工程改造生产1,4-丁二醇及其高附加值衍生产品提供了一种新的思路。

关键词：大肠杆菌代谢改造 1,4-丁二醇路径优化