检索结果-内蒙古大学图书馆

cURRENT OPINION IN cOLLOID & INTERFAcE ScIENcE 1997年第5期2卷 495-500页

作者： Lynch, ML The Procter & Gamble Company Miami Valley Laboratories PO Box 4538707 Cincinnati Ohio 45253-8707 USA

The study of acid-soap crystals has resulted in many conflicting data. Recent progress in two areas, however, is providing substantial improvements. First, there is an increased awareness in the treatment of these solid-state systems. While specific methodologies are still being developed, the axioms have been articulated. Second, improvements in NMR and IR spectroscopy have led to better characterization of acid-soap crystals, providing clues to the nature of acid-soaps and related hydrogen bonding.

关键词： Ar cH 3 (cH 2 ) 18 cOO − Bh cH 3 (cH 2 ) 20 cOO − c cH 3 (cH 2 ) 8 cOO − IR infrared L cH 3 (cH 2 ) 10 cOO − M cH 3 (cH 2 ) 12 cOO − NMR nuclear magnetic resonance Oc cH 3 (cH 2 ) 6 cOO − Ol cH 3 (cH 2 ) 7 cH:cH(cH 2 ) 7 cOO − P cH 3 (cH 2 ) 14 cOO − St cH 3 (cH 2 ) 16 cOO −

来源：评论

学校读者我要写书评

暂无评论

Modules based on the geochemical model PHREEQc for use in scripting and programming languages

引用

cOMPUTERS & GEOScIENcES 2011年第10期37卷 1653-1663页

作者： charlton, Scott R. Parkhurst, David L. US Geol Survey Denver Fed Ctr Lakewood CO 80225 USA

The geochemical model PHREEQc is capable of simulating a wide range of equilibrium reactions between water and minerals, ion exchangers, surface complexes, solid solutions, and gases. It also has a general kinetic formulation that allows modeling of nonequilibrium mineral dissolution and precipitation, microbial reactions, decomposition of organic compounds, and other kinetic reactions. To facilitate use of these reaction capabilities in scripting languages and other models. PHREEQc has been implemented in modules that easily interface with other software. A Microsoft cOM (component object model) has been implemented, which allows PHREEQc to be used by any software that can interface with a cOM server-for example, Excel (R), Visual Basic (R), Python, or MATLAB (R), PHREEQc has been converted to a c++ class, which can be included in programs written in c++. The class also has been compiled in libraries for Linux and Windows that allow PHREEQc to be called from c++, c, and Fortran. A limited set of methods implements the full reaction capabilities of PHREEQc for each module. Input methods use strings or files to define reaction calculations in exactly the same formats used by PHREEQc. Output methods provide a table of user-selected model results, such as concentrations, activities, saturation indices, and densities. The PHREEQc module can add geochemical reaction capabilities to surface-water, groundwater, and watershed transport models. It is possible to store and manipulate solution compositions and reaction information for many cells within the module. In addition, the object-oriented nature of the PHREEQc modules simplifies implementation of parallel processing for reactive-transport models. The PHREEQc cOM module may be used in scripting languages to fit parameters;to plot PHREEQc results for field, laboratory, or theoretical investigations;or to develop new models that include simple or complex geochemical calculations. Published by Elsevier Ltd.

关键词： Geochemical modeling PHREEQc Reactive-transport modeling cOM component object model c plus c Fortran

来源：评论

学校读者我要写书评

暂无评论

Helium and neon isotopes in phenocrysts from Samoan lavas: Evidence for heterogeneity in the terrestrial high ³He/⁴He mantle

引用

EARTH AND PLANETARY ScIENcE LETTERS 2009年第3-4期287卷 519-528页

作者： Jackson, Matthew G. Kurz, Mark D. Hart, Stanley R. Carnegie Inst Sci Dept Terr Magnetism Washington DC 20015 USA Woods Hole Oceanog Inst Woods Hole MA 02543 USA

We report the first neon isotope measurements on phenocrysts from subaerial and submarine Samoan lavas. These new data complement existing Ne-isotope data from Samoan peridotite xenoliths (Poreda, R.J., Farley, K.A.,1992. Rare gases in Samoan xenoliths. Earth Planet Sci. Lett. 113, 689 129-144). Neon isotopes were measured in magmatic phenocrysts separated from nine shield-stage lavas from 5 Samoan volcanoes, including Ofu, Ta'u, Vailulu'u, Malumalu and Savai'i Phenocrysts from subaerial Samoan lavas have higher Ne-20/Ne-22 than submarine phenocrysts, which may suggest different atmospheric contamination mechanisms for these two different eruptive environments. Olivine phenocrysts from a subaerial Ta'u lava exhibit the highest Ne-20/Ne-22 (11.33 +/- 0.08, 1 sigma) value in this study. Two subaerial Samoan samples from Ofu Island with high He-3/He-4 ratios (Ofu-04-06 and Ofu-04-03;34 and 24 Ra [ratio to atmosphere], respectively) also have elevated Ne-20/Ne-22 ratios relative to air, and in a three-isotope neon plot the Ofu samples are indistinguishable from measurements made on high He-3/He-4 lavas from Hawaii, Iceland and Galapagos. The similarity of helium and neon isotopes in Ofu and Hawaii-Iceland-Galapagos is remarkable given the distinctions in Sr-87/Sr-86 (0.70458 for Ofu vs. 0.70329-0.70368 for Hawaii-Iceland-Galapagos) and Nd-143/Nd-144 (Ofu's 0.51283 vs. 0.51294-0.51297 for Hawaii-Iceland-Galapagos) in high He-3/He-4 lavas from these localities. Thus, the occurrence of similar helium and neon isotope compositions in lavas from these 4 hotspots does not appear to be linked to their variable Sr and Nd isotope compositions, and demonstrates a complex relationship between the isotopes of noble gases and the more refractory radiogenic isotopes. Additionally, we observe strongly nucleogenic neon isotopes in one the most isotopically-enriched (Sr-87/Sr-86>0.718) Samoan lavas. This observation is consistent with the presence of recycled, continentally-derived mari

关键词： He-3/He-4 neon isotopes FOZO PHEM c EM2 Samoa OIB mantle

来源：评论

学校读者我要写书评

暂无评论

Photoluminescence of SiO2:Eu and SiON:Eu films: color selection through activating emissions from SiOx, Eu3+, and Eu2+

引用

cERAMIcS INTERNATIONAL 2023年第11期49卷 16673-16680页

作者： Akazawa, Housei Nishi, Hidetaka NTT Corp NTT Device Innovat Ctr 3-1 Morinosato Wakamiya Atsugi Kanagawa 2430198 Japan NTT Corp NTT Device Technol Labs 3-1 Morinosato Wakamiya Atsugi Kanagawa 2430198 Japan

Photoluminescence (PL) from Eu-doped SiO2 (SiON) thin films sputter-deposited in O2, H2O vapor, or a mixture of O2 and N2 gases was characterized by excitation at a wavelength of 325 nm. The SiO2 films deposited at 500 degrees c with O2 contained small amount of alpha-quartz nanocrystals. The primary condition for either or both of the Eu3+ and Eu2+ emissions to appear was Eu content between 1 and 3 at.%, and 2.5 at.% gave the maximum emission intensity of Eu3+. The PL spectra showed only the Eu3+ emission when the films were deposited at room tem-perature (RT) and subsequently post annealed in an O2 atmosphere. changing the annealing atmosphere from O2 to a vacuum and annealing at temperatures above 600 degrees c resulted in an intense broad violet emission signal peaking at 390 nm along with the Eu3+ emission signal. This violet emission originated from reduced SiOx species. When deposited at RT, similar temperature-dependent emission properties were obtained regardless of the reactive gas (H2O vapor or a mixture of O2 and N2). complete transformation of Eu3+ into Eu2+ occurred when deposition was carried out at temperatures between 400 and 500 degrees c;a blue emission at around 467 nm was predominant from the SiO2:Eu2+ films. Deposition in the O2 and N2 gas mixture at elevated temperatures pro-duced SiON:Eu2+ films, from which an intense white emission band peaking at 525 nm and ranging between 400 and 650 nm was observed.

关键词： A Films B Spectroscopy c Optical properties D SiO2

来源：评论

学校读者我要写书评

暂无评论

Ability of Ganoderma lucidum mycelial pellets to remove ammonia and organic matter from domestic wastewater

引用

INTERNATIONAL JOURNAL OF ENVIRONMENTAL ScIENcE AND TEcHNOLOGY 2022年第8期19卷 7307-7320页

作者： Hanafiah, Z. M. Mohtar, W. H. M. Wan Hasan, H. A. Jensen, H. S. Klaus, A. Sharil, S. Wan-Mohtar, W. A. A. Q., I Univ Kebangsaan Malaysia UKM Fac Engn & Built Environm Dept Civil Engn Ukm Bangi 43600 Selangor Malaysia Univ Kebangsaan Malaysia UKM Fac Engn & Built Environm Dept Chem & Proc Engn Ukm Bangi 43600 Selangor Malaysia Univ Sheffield Dept Chem & Biol Engn Sheffield S Yorkshire England Univ Belgrade Fac Agr Inst Food Technol & Biochem Nemanjina 6 Belgrade 11080 Serbia Univ Malaya Fac Sci Inst Biol Sci Funct Omics & Bioproc Dev Lab Kuala Lumpur 50603 Malaysia

In this study, we explored the ability of wild-Serbian Ganoderma lucidum mycelial pellets (GLMPs) in treating synthetic domestic wastewater in a batch reactor under various operating conditions. The GLMPs produce non-hazardous by-products, are environmentally sustainable and able to produce in mass bulk with consistent quality. Riding on the highly efficient of treatment of industrial (textile) wastewater using GLMPs, similar high efficiency is foreseen for domestic wastewater as a green alternative treatment process. The optimal performance of GLMPs in similar synthetic domestic wastewater with a carbon-to-Nitrogen (c/N) ratio of 16.7:1 was evaluated under three operational conditions. The c/N ratio was chosen based on the urban domestic wastewater characteristic during high peak flow with an initial chemical Oxygen Demand (cOD) of 533 mg/L and ammonia-nitrogen (NH3-N) content of 30 mg/L. The operational parameters of agitation speed (0 rpm, 25 rpm, 50 rpm, and 100 rpm), environmental temperature (25 degrees c, 30 degrees c, 35 degrees c, and 40 degrees c), and GLMP inoculum percentage (GIP) (0%, 0.25%, 0.50%, 0.75%, and 1.00%) were chosen for the experiment. In the experiment, the agitation speed of 100 rpm and the environmental temperature of 25 degrees c showed the best performance of the GLMPs within 15 h of retention time with a percentage removal of 92.9% for cOD and 93.8% for NH3-N. Furthermore, a high volume of GIP in the batch reactor had an insignificant impact on the performance in the same concentration of wastewater, and 0.25% GIP was the volume used to treat the domestic wastewater.

关键词： Ganoderma lucidum Batch reactor Domestic wastewater c N ratio Mycelial pellet

来源：评论

学校读者我要写书评

暂无评论

Antimicrobial Activity of Thymol and Thymol-Nanoemulsion Against Three Food-Borne Pathogens Inoculated in a Sausage Model

引用

FOOD AND BIOPROcESS TEcHNOLOGY 2021年第10期14卷 1936-1945页

作者： Sepahvand, Somayeh Amiri, Sedigheh Radi, Mohsen Akhavan, Hamid-Reza Islamic Azad Univ Yasooj Branch Dept Food Sci & Technol Yasuj Iran Islamic Azad Univ Yasooj Branch Sustainable Agr & Food Secur Res Grp Yasuj Iran Shahid Bahonar Univ Kerman Dept Food Sci & Technol Fac Agr Kerman Iran

In the present study, the antimicrobial efficiency of thymol and thymol-nanoemulsion (NE) was investigated against S. aureus, E. coli, and c. perfringens on a sausage product during 4 weeks. The droplets size of the thymol-NE was 86.39 nm with the zeta potential of -0.86 mV. The MIc and MBc values for thymol were approximately twice that of NE, indicating that NE was more effective in inhibiting the growth of three tested bacteria. According to agar well diffusion test results, the antimicrobial activity of thymol and the NE was not different against three tested bacteria. In inoculated sausages with E. coli, c. perfringens, and S. aureus at 10(5.5) log cFU/g, the control had the highest bacterial counts, followed by 120 mg/kg nitrite treated samples, both of which had an increasing trend over time. In contrast, the growth trend of all three bacteria, in the samples treated with thymol (600 mg/kg), NE (containing 600 mg/kg thymol), thymol (600 mg/kg) + nitrite (60 mg/kg), and NE (containing 600 mg/kg thymol) + nitrite (60 mg/kg) decreased significantly (5.68-6.33 log cFU/g reduction in comparison with control), with no significant difference among them against each bacterium. The color quality of NE + nitrite and thymol + nitrite was quite similar to 120 mg/kg nitrite-containing samples. The bacteria growth followed a first-order kinetic. The results showed the great potential of thymol and its NE for being used as an antimicrobial agent in the meat products, and NE + nitrite and thymol + nitrite can be a good choice to maintain the microbial and color quality of the sausage products.

关键词： Essential oils Nitrite substitute E coli c perfringens S aureus

来源：评论

学校读者我要写书评

暂无评论

One-day thermal regime extends the lifespan in caenorhabditis elegans

引用

cOMPUTATIONAL AND STRUcTURAL BIOTEcHNOLOGY JOURNAL 2023年 21卷 495-505页

作者： Huang, Jichang Wang, Kai Wang, Mengqing Wu, Zhen Xie, Guangjie Peng, Yuling Zhang, Yan Zhang, Xumin Shao, Zhiyong Fudan Univ Sch Life Sci Dept Biochem State Key Lab Genet Engn Shanghai 200438 Peoples R China Fudan Univ Zhongshan Hosp Dept Neurosurg State Key Lab Med NeurobiolInst Brain Sci Shanghai 200032 Peoples R China Fudan Univ Zhongshan Hosp Inst Brain Sci MOE Frontiers Ctr Brain Sci Shanghai 200032 Peoples R China Inst Geriatr Cardiovasc Dis Chengdu Med Coll Chengdu 610000 Sichuan Peoples R China Guangdong Acad Med Sci Guangdong Prov Peoples Hosp Guangdong Prov Key Lab Pathogenesis Targeted Prevent & Treatment Heart DisGuangdong C Guangzhou 510080 Guangdong Peoples R China Sichuan Univ West China Hosp Natl Clin Res Ctr Geriatr State Key Lab Biotherapy Chengdu 610041 Sichuan Peoples R China

Environmental factors, including temperature, can modulate an animal's lifespan. However, their under-lying mechanisms remain largely undefined. We observed a profound effect of temperature on the aging of caenorhabditis elegans (c. elegans) by performing proteomic analysis at different time points (young adult, middle age, and old age) and temperature conditions (20 degrees c and 25 degrees c). Importantly, although at the higher temperature, animals had short life spans, the shift from 20 degrees c to 25 degrees c for one day during early adulthood was beneficial for protein homeostasis since;it decreased protein synthesis and increased degradation. consistent with our findings, animals who lived longer in the 25 degrees c shift were also more resistant to high temperatures along with oxidative and UV stresses. Furthermore, the lifespan extension by the 25 degrees c shift was mediated by three important transcription factors, namely FOXO/DAF-16, HSF-1, and HIF-1. We re-vealed an unexpected and complicated mechanism underlying the effects of temperature on aging, which could potentially aid in developing strategies to treat age-related diseases. Our data are available in ProteomeXchange with the identifier PXD024916.(c) 2022 The Authors. Published by Elsevier B.V. on behalf of Research Network of computational and Structural Biotechnology. This is an open access article under the cc BY-Nc-ND license (http://***/licenses/by-nc-nd/4.0/).

关键词： Lifespan Temperature c elegans Proteostasis DAF-16 HSF-1 HIF-1

来源：评论

学校读者我要写书评

暂无评论

Field enhancement assisted graphene-based microring modulator for high modulation depth

引用

IET OPTOELEcTRONIcS 2020年第6期14卷 391-398页

作者： Joshi, Swati Kaushik, Brajesh Kumar Indian Inst Technol Roorkee Dept Elect & Commun Engn Microelect & VLSI Grp Roorkee 247667 Uttarakhand India

This study aims at optimising the graphene coverage in a microresonator for the design of an efficient modulator by using a combination of graphene induced losses and phase shift. The graphene integration in the ring can provide tunability by means of altering the loss and coupling coefficient by changing the graphene coverage or its chemical potential. The fundamental parameters of graphene integrated all-pass ring resonator are extracted based on the transmission characteristics using finite-difference time-domain method. As compared to conventional graphene-oxide-semiconductor straight waveguide, graphene integrated on an all-pass ring resonator shows enhanced optical absorption and phase shift due to field enhancement factor. A modulator based on graphene tunable loss and phase shift is investigated taking into account the field enhancement factor. For 1.55 mu m radiation and ring radius of 3.75 mu m with 22% graphene coverage, a maximum modulation depth of 12.6 dB is demonstrated based on electrostatic control of graphene chemical potential. The proposed modulator can feature operational speed in the range of 10 GHz that is useful in a variety of electro-optic applications.

关键词： micro-optics optical modulation integrated optics graphene optical resonators optical tuning finite difference time-domain analysis micromechanical resonators optical losses light absorption light transmission micro-optomechanical devices optical design techniques field enhancement factor graphene tunable loss phase shift graphene coverage graphene chemical potential modulation depth efficient modulator graphene induced losses coupling coefficient finite-difference time-domain method optical absorption field enhancement assisted graphene-based microring modulator fundamental parameters graphene integrated all-pass ring resonator transmission characteristics ring radius electrostatic control microresonator radius 3 75 mum wavelength 1 55 mum c

来源：评论

学校读者我要写书评

暂无评论

Magnetic molecular materials

引用

cURRENT OPINION IN SOLID STATE & MATERIALS ScIENcE 1996年第2期1卷 192-198页

作者： Gatteschi, D Department of Chemistry University of Florence Via Maragliano 77 50144 Florence Italy

Magnetic molecular materials are actively investigated along two different but complementary lines of research, that of designing bulk magnets with permanent magnetization, possibly with high critical temperatures, and that of synthesizing large, but finite, magnetic clusters, which can be considered as small magnetic particles of nanoscale size. In both areas the techniques of molecular chemistry are employed to assemble organic, organometallic and inorganic building blocks into complex architectures. Major advances have been achieved, ranging from the development of magnets with a critical temperature higher than room temperature to the use of biological approaches to test quantum tunneling of the magnetization.

关键词： T c critical temperature

来源：评论

学校读者我要写书评

暂无评论

Molecular dynamics study of bio-manipulation in aqueous media

引用

MIcRO & NANO LETTERS 2016年第1期11卷 9-14页

作者： Kheirodin, Mohsen Pishkenari, Hossein Nejat Mahboobi, Seyed Hanif Sharif Univ Technol Sch Mech Engn Nano Robot Lab Tehran Iran Univ Calif Berkeley Dept Bioengn Berkeley CA 94720 USA

Nano-manipulation is one of the most important aspects of nano-robotics and nano-assembly. The positioning process is considered by many researches to be one of the most important parts of nano-assembly, but has been poorly investigated, particularly for biologic samples. This Letter is devoted to modelling the process of positioning a biomolecule with atomic force microscopy (AFM) in an aqueous media using molecular dynamics simulations. carbon nanotube (cNT) and graphite sheet are selected as AFM tip and substrate, respectively. To consider the effects of the medium on the manipulation, several models for decreasing the calculations including implicit, coarse grained, and all-atom methods have been investigated. They examined several parameters which may affect the quality of the manipulation process such as the cNT initial position with respect to the sample and substrate, its diameter and positioning strategies (pushing or pulling). The results demonstrate that despite of the implicit solvent methods, coarse-grained model can simulate the aqueous media accurately with lower computational cost. Furthermore, pulling method with a cNT which has a larger diameter and a smaller gap with respect to the substrate is the most appropriate setting for manipulation.

关键词： molecular dynamics method atomic force microscopy carbon nanotubes nanopositioning graphite biomanipulation aqueous media nanomanipulation nanorobotics nanoassembly atomic force microscopy molecular dynamics simulations carbon nanotube graphite sheet pushing pulling c

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：