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Fe3O4 nanoparticles impregnated eggshell as a novel catalyst for enhanced biodiesel production

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ch.nese Journal of ch.mical Engineering 2019年第11期27卷 2835-2843页

作者： ch.ch.ngakham Asha David V.Sajith Sch.ol of Nano Science and Tech.ology National Institute of Technology CalicutIndia Malabar ch.istian College CalicutIndia

Biodiesel is a green fuel which.can replace diesel while addressing various issues such.as scarcity of hydrocarbon fuels and environmental pollution to an extent. The high production cost of biodiesel and the recovery of the catalyst after the transesterification process are the major ch.llenges to be addressed in biodiesel production. In the present work, a ch.ap and promising solid base oxide catalyst was synthesized from ch.cken eggshell by calcination at 900 ℃ forming catalyst eggshells(CES) and was impregnated with the nanomagnetic material(Fe3O4) to obtain Fe3O4 loaded catalytic eggshell(CES–Fe3O4). Fe3O4 nanomaterials were synthesized by co-precipitation method and were loaded in catalytic eggshell by sonication, for better recovery of the catalyst after transesterification process. CES–Fe3O4 material was ch.racterized by Thermogravimetric analysis, X-ray diffraction, Fourier transform infrared spectroscopy, a vibrating-sample magnetometer, Brunauer-Emmett-Teller, Dynamic light scattering, and Scanning electron microscopy. Biodiesel was synthesized by transesterification of Pongamia pinnata raw oil with 1:12 oil to methanol molar ratio and 2 wt% catalyst loading for 2 h at a temperature of 65 ℃ and yields were compared. The reusability of the catalyst was studied by the transesterification of the raw oil and its catalytic activity was found to be retained up to 7 cycles with a yield of 98%.

关键词： Catalyst Biodiesel Nanoparticles Fe3O4 Impregnation Transesterification

Development of low-carbon tech.ologies in ch.na's integrated hydrogen supply and power system

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Advances in Climate ch.nge Research 2024年第5期15卷 936-947页

作者： Dai-Wei LI un-Ling hUANG Dan YU Da ZhANG Xi-Liang ZhANG Tsinghua university-ch.na Three Gorges Corporation Joint Research.Center for Climate Governance Mech.nism and Green Low-carbon Transformation Strategy Beijing 100084China Institutes of Energy Environment and EconomyTsinghua UniversityBeijing 100084China International Clean Energy Research.Office China Three Gorges CorporationBeijing 100038China National Center for Climate ch.nge Strategy and International Cooperation Bejing 100035China

hydrogen and electricity are crucial and interdependent energy carriers in ch.na's pursuit of carbon neutrality,suggesting the necessity of utilizing cost-effective low-carbon tech.ologies that facilitate their integrated *** cost-optimal,provincial level,deployment of low-carbon tech.ologies under this long-term goal remains to be *** study employs the REPO model to identify the cost-optimal,low-carbon hydrogen production mixes and the evolution of the integrated power system of ch.na from 2020 to *** integrated planning and operation of hydrogen supply and power systems are explored at the provincial *** role of high-temperature gas-cooled reactors in this integrated energy system is also *** results reveal that electrolytic hydrogen would dominate ch.na's hydrogen supply after 2040,with alkaline,proton exch.nge membrane,and solid oxide electrolyzers produce over 1 Mt of hydrogen in the short term,by 2035,and in *** the low-carbon heat production of high-temperature gas-cooled reactors in addition to its electricity generation to meet the thermal requirements of solid oxide electrolyzers could boost the output to 4.2 Mt in 2050 and reducing the total system CO_(2) emissions and costs by 2.28%and 0.05%,*** 2050,the integration of hydrogen supply and power systems also generates up to 2194 TW h of flexible electricity demand by electrolyzers,which.raised the renewable energy penetration by 4 percentage points while decreasing the need of flexible natural gas power generations and energy *** study is valuable for proposing the analytical framework and performing the provincial-level study of decarbonization of ch.na's integrated hydrogen supply and power system.

关键词： hydrogen energy Power system Energy system modelling Scenario analysis Carbon neutrality

Identification of optimal contemporary antiemetic prophylaxis for doxorubicin-cyclophosphamide ch.motherapy in ch.nese cancer patients: post-hoc analysis of 3 prospective studies

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Cancer Biology & Medicine 2021年第3期18卷 825-832页

作者： Winnie Yeo Leung Li Thomas Kh Lau Kwai T Lai Vicky,TC ch.n Kwan h Wong ch.istopher ch.Yip Elizabeth Pang Maggie Ch.ung Vivian ch.n Carol ch.Kwok Joyce JS Suen Frankie KF Mo Department of Clinical Oncology Prince of Wales HospitalFaculty of MedicineHong Kong Cancer InstituteHong KongChina State Key Laboratory of Translational Oncology The Chinese University of Hong KongHong KongChina Department of Clinical Oncology Princess Margaret HospitalHong KongChina

Objective:ch.motherapy-induced nausea and vomiting(CINV)are common with doxorubicin-cyclophosphamide(AC)*** antiemetic regimens incorporate neurokinin-1 receptor antagonist(NK1 RA),5-hydroxytryptamine type-3 receptor antagonist(5 hT3 RA),corticosteroid,and dopamine *** post-hoc analysis compared results of 3 prospective antiemetic studies conducted among ch.nese breast cancer patients who received(neo)adjuvant AC,in order to identify optimal antiemetic ***:A total of 304 patients were included:Group 1,ondansetron/dexamethasone(D1);Group 2,aprepitant/ondansetron/dexamethasone(D1);Group 3,aprepitant/ondansetron/dexamethasone(D1–3);Group 4,aprepitant/ondansetron/dexamethasone(D1–3)/olanzapine;and Group 5,netupitant/palonosetron/dexamethasone(D1–3).Antiemetic efficacies of Groups 3,4,and 5 during cycle 1 of AC were individually compared with Group *** addition,emesis outcomes of patients in Groups 3 and 5,and those of Groups 2 and 3,were ***:When comparing efficacies of a historical doublet(5 hT3 RA/dexamethasone)with triplet antiemetic regimens(NK1 RA/5 hT3 RA/dexamethasone)with/without olanzapine,complete response(CR)percentages and quality of life(QOL)in overall phase of cycle 1 AC were compared between Group 1 and the other groups:Group 1 vs.3,41.9%vs.38.3%(P=0.6849);Group 1 vs.4,41.9%vs.65.0%(P=0.0107);and Group 1 vs.5,41.9%vs.60.0%(P=0.0460).Groups 4 and 5 ach.eved a better *** comparing netupitant-based(Group 3)with aprepitant-based(Group 5)triplet antiemetics,CR percentages were 38.3%vs.60.0%,respectively(P=0.0176);Group 5 ach.eved a better *** comparing 1 day(Group 2)vs.3 day(Group 3)dexamethasone,CR percentages were 46.8%and 38.3%,respectively(P=0.3459);Group 3 had a worse ***:Aprepitant-containing triplets were non-superior to doublet ***-containing triplets and adding olanzapine to aprepitant-containing triplets were superior to ***/palono

关键词： Netupitant palonosetron aprepitant olanzapine NEPA Asians

h2A.Z contributes to trithorax activity at the AGAMOUS locus

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Molecular Plant 2022年第2期15卷 207-210页

作者： un-Sa Lee Tomasz Bieluszewski Jun Xiao Ayako Yamaguch. Doris Wagner university of Pennsylvania Department of Biology19108 PhiladelphiaPAUSAUniversity of PennsylvaniaDepartment of Biology19108 PhiladelphiaPAUSA Institute of Genetics and Developmental Biology Chinese Academy of SciencesBeijing100190China Centre of Excellence for Plant and Microbial Science(CEPAMS) The John Innes CentreNorwich Research ParkNorwichNR47UHUK

Dear Editor,In multicellular eukaryotes,Polycomb repression heritably si-lences gene expression programs not needed or detrimental for a given developmental stage or tissue(Sch.ettengruber et al.,2017).During cell fate reprogramming,Polycomb silencing can be overcome by the combined activity of multiple Trithorax group(TrxG)proteins(Wu et al.,2012;Liang et al.,2015;Sch.ettengruber et al.,2017).TrxG proteins are genetically defined as suppressors of homeotic defects caused by loss of Polycomb function and have diverse enzymatic activities(Sch.ettengruber et al.,2017).We used a genetic enhancer screen to identify candidate TrxG proteins and uncovered TrxG activity for components of the SWR1 ch.omatin remodeling complex,which.deposits the histone variant h2A.Z(Deal et al.,2007;March.Diaz et al.,2008).

关键词： h2A.Z suppressor

Synthesis, ch.racterization and Biological Activity Studies on Novel 4-ch.oro-2- [(1-Phenyl-1h-Tetrazol-5-Ylimino)-Methyl] Phenol and Its Metal Complexes

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Journal of Materials Science and ch.mical Engineering 2015年第10期3卷 45-59页

作者： Ranjithreddy Palreddy Jaheer Mohmed Nagula Narsimha Boinala Aparna Mariyam ch. Sarala Devi Department of ch.mistry University College of Science Osmania University Hyderabad India

Novel 4-ch.oro-2-[(1-phenyl-1h-tetrazol-5-ylimino)-methyl] phenol (Cl-PTMP) and its transition metal complexes were synthesized and ch.racterized by FT-IR, 1h-NMR, UV-Vis spectroscopy, Mass spectrometry, TGA and SEM. The ph-metric tech.ique was applied to get an insight of the number of dissociable protons and protonation sites in candidate compound. The ph-Metric studies were also carried out in presence of metal ions to establish the formation of corresponding metal complexes in solution. Further, the metal ligand compositions of Cu (II) and Co (II) complexes were determined spectrophotometrically by employing Job’s continuous variation method. To know the molecular properties in title imine compound suitable for metal ion coordination, the computational studies were carried out by employing hyperch.m 7.5 tools. The energies of hOMO and LUMO frontier orbitals and their electron density contour maps were generated with geometry optimized molecule. Biological activity of Cl-PTMP and its metal complexes was investigated by disc diffusion method.

关键词： Synthesis Cu (II) and Co (II) Complexes ph-Metry Spectro-Analytical and Biological Studies

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铸铁铁水的孕育机理

铸造技术 1982年第1期 63-70页

作者： ch. Wang h. Frederiksson 周定远西安交通大学

本文研究了孕育过程、在少量铸铁铁水加入硅铁粒。把铁水淬火中止熔解过程。试样进行了金相观察和化学分析。熔解过程中:在FeSi粒的周围观察到碳化硅结晶和和石墨质点的生成。也观察到在加入的FeSi粒全部熔解后这些质点很快又熔解。并... 详细信息

本文研究了孕育过程、在少量铸铁铁水加入硅铁粒。把铁水淬火中止熔解过程。试样进行了金相观察和化学分析。熔解过程中:在FeSi粒的周围观察到碳化硅结晶和和石墨质点的生成。也观察到在加入的FeSi粒全部熔解后这些质点很快又熔解。并指出熔解完后局部的高硅和高碳区存在较长时间。由于这些硅和碳的不均匀分布:产生石墨的均质核心。孕育的衰退可以解释为硅和碳的不均匀分布的均匀化。

关键词：铸铁均匀化硅铁工业铁孕育剂变质剂碳活度铁水熔融金属石墨管均质成核

Determination of Particle Sizes and Crystalline Phases on Colloidal Silicon Nanoparticle Suspensions

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Journal of Materials Science & Tech.ology 1999年第6期15卷 548-550页

作者： S.M. Sch.lz and h hofmann(Powder Tech.ology Laboratory, Department of Materials Science, Swiss Federal Institiute of Tech.ology Lausanne,ch.1015 Lausanne, Switzerland) Swiss Fed Inst Tech.ol Dept Mat Sci Powder Technol Lab CH-1015 Lausanne Switzerland

Particle size and crystallinity of silicon nanoparticles were determined by analyzing the optical extinction spectra of colloidal suspensions. Experimental results from these colloids were anaiyzed using Mie theory in connection with effective medium theory, in order to determine particle sizes and their internal structure with the simple tech.ique of optical transmission spectroscopy. By modeling an effective refractive index for the particles, the crystalline volume fraction can be extracted from extinction spectra in addition to information about the size. The crystalline volume fraction determined in this way were used to calibrate the ratio of the Raman cross sections for nanocrystalline and amorphous silicon, which.was found to be σc./σa = 0.66

关键词： Determination of Particle Sizes and Crystalline Phases on Colloidal Silicon Nanoparticle Suspensions

Direct oxidation of methane to oxygenates over heteropolyanions

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Journal of Natural Gas ch.mistry 2008年第3期17卷 309-312页

作者： Ouarda Benlounes Sadia Mansouri ch.rifa Rabia Smain hocine Laboratoire de ch.mie Appliqueé et de Génie ch.mique Université Mouloud Mammeri Laboratoire de ch.mie du Gaz Naturel Institut de Chimie USTHB

Partial oxidation of methane to formaldehyde and methanol was studied at atmospheric pressure in the temperature range of 700-750 °C using heteropolycompound catalysts （Nh4）6hSiMo11FeO40, （Nh4）4PMo11FeO39, and h4PMo11VO40, which.were prepared and ch.racterized by various analysis tech.iques such.as infrared, visible UV, XRD and DTA. O2 or N2O was used as the oxidizing agent, and the principal products of the reaction were ch.Oh, ch.O, CO, CO2, and water. The conversion and the selectivity of products depend strongly on the reaction temperature, the nature of oxidizing agent, and the composition of catalyst.

关键词： methane oxidation heteropolycompounds methanol oxygenates

Synthesis, XRD &SEM Studies of Zinc Substitution in Nickel Ferrites by Citrate Gel Tech.ique

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World Journal of Condensed Matter Physics 2012年第3期2卷 153-159页

作者： K. Rama Krishna D. Ravinder K. Vijaya Kumar ch. Abraham Lincon Department of ch.mistry P. G. College of Science Osmania University Hyderabad India Department of Physics Jawaharlal Nehru Technological University Hyderabad College of Engineering Nachupally (Kondagattu) India Department of Physics Malla Reddy College of Engineering & Technology Secunderabad India Department of Physics P. G. College of Science Osmania University Hyderabad India

Ni-Zn ferrite with a nominal composition of Ni1–XZnXFe2O4 (X = 0, 0.2, 0.6, 0.8, 0.9 & 1.0) ferrite powders have been successfully prepared at a very low temperature (180℃) by a novel auto combustion process using citric acid as a coordinating agent. Phase purity of the solid solutions has been confirmed by X-ray diffraction. Morphological, elemental composition ch.racterizations of the prepared samples were performed by high resolution scanning electron microscopy and energy dispersive spectroscopy (EDS). Magnetic properties of all samples are obtained by using VSM (Vibrating Sample Magnetometer) in the range of 10 K oe. The saturation magnetization values of the samples are carried out from the B-h loop. The effect of composition on saturation magnetization and magnetic moment are studied in this paper. The results showed that Saturation magnetization and magnetic moment values increases gradually as Zn2+ composition increases, it reach.s maximum value 70.28 emu/gm for (X = 0.6) and decreases further with increasing Zn2+ composition.

关键词： Ni-Zn Ferrite Citrate Precursor Auto Combustion Saturation Magnetization Magnetic Moment