Photocatalytic production of H2O2 over facet-dependent Ti-MOF

Author(s):  
Yuanzhou Zheng ◽  
Hualan Zhou ◽  
Bosen Zhou ◽  
Jiangchen Mao ◽  
Yinghao Zhao

In the past several years, Two phases photocatalysts, such as PDI/C3N4, ZIF/C3N4 or Cu2(OH)PO4/C3N4, were used for H2O2 photo-production. Few monocomponent photocatalysts for H2O2 production were reported. In the monocomponent...

2008 ◽  
Vol 12 (1) ◽  
pp. 69-85
Author(s):  
Dennis Radford ◽  
Douglas Cawthorne

The work and the life of the English architect Sir Edwin Landseer Lutyens (1869–1944) have been extensively documented over the past hundred years and clearly show a career with at least two phases. The first is characterised by the design of private country houses in the Arts and Crafts style and, in collaboration with the horticulturalist Gertrude Jekyll, the development of their gardens. The second begins around 1900 and reflects a shift towards Neo-Classicism, initially in country houses and later in a wider range of larger public buildings and monuments both in England and abroad. Lutyens developed his use of the Neo-Classical idiom throughout the latter part of his career into a unique style of design which Arthur Stanley George Butler has termed his ‘elemental mode’. This was characterised by a highly controlled use of form and mass, apparent adherence to rules of Classical proportioning and the sparing use of symbolic Classical motifs. However, very little is known with any certainty about how Lutyens actually achieved this style, in particular what role was attributable to intuition and good taste, as is often assumed, and how much may have been attributable to quantitative and formalised methods of design. Circumstantial evidence exists that strongly suggests that quantitative analytical methods may have been used in a method which drew upon his interest in puzzles and mathematics, his interests in architectural history (particularly English Neo-Classicism), his leanings towards mysticism and his exposure to Theosophy.


2012 ◽  
Vol 2 (2) ◽  
pp. 125-144
Author(s):  
Marcela Batistič Zorec ◽  
Andreja Hočevar

The present article examines the changes in Slovene preschools subsequent to Slovenia’s independence in 1991. In the socialist period, the national education programme for preschools was highly structured, goaland content-oriented and subject to schoolization. The Curriculum for Preschools (1999) brought conceptual changes towards education “based on the child” and the process approach, as well as giving more autonomy to preschool teachers and their assistants. In the empirical study, we examine changes in planning and evaluating educational work compared to the past. The results show that the majority of professionalworkers have reduced the high level of structure and rigidity in planning, and that there is better cooperation between preschool teachers and teachers’ assistants. Unlike in the past, most professional workers regularly evaluate their educational work. As the data was gathered in two phases, before and after the training of professional workers in the Reggio Emilia concept, we also search for the (probably indirect) influences of this training. We conclude that after the training the participation of children in planning and evaluating educational work is higher.


2015 ◽  
Author(s):  
Emilie Dambroise ◽  
Lea Monnier ◽  
Lu Ruisheng ◽  
Hugo Aguilaniu ◽  
Jean-Stephane Joly ◽  
...  

Aging s most obvious characteristic is the time dependent increase of an individual s probability to die. This lifelong process is accompanied by a large number of molecular and physiological changes. Although numerous genes involved in aging have been identified in the past decades its leading factors have yet to be determined. To identify the very processes driving aging we have developed in the past years an assay to identify physiologically old individuals in a synchronized population of Drosophila melanogaster. Those individuals show an age-dependent increase of intestinal permeability followed by a high risk of death. Here we show that this physiological marker of aging is conserved in 3 invertebrate species Drosophila mojavensis, Drosophila virilis, Caenorhabditis elegans and 1 vertebrate specie Danio rerio. Our findings suggest that intestinal barrier dysfunction may be an important event in the aging process conserved across a broad range of species, thus raising the possibility that it may also be the case in Homo sapiens.


Author(s):  
J. Donald Boudreau ◽  
Eric J. Cassell ◽  
Abraham Fuks

This chapter provides a historical overview of medical education in the Western world. It begins with a brief description of the “French school” that emerged out of the French Revolution. This model, with an emphasis on clinicopathologic correlation, has also been labeled “hospital medicine.” The discussion then moves to outline the contributions made by Abraham Flexner’s seminal 1910 report. Flexner is generally considered to be largely responsible for the traditional organizational framework of medical school curricula, one with two phases: preclinical and clinical. The perceived shortcomings of this pedagogical approach, sometimes called “university medicine” or the “2-plus-2” model are noted. The two major corrective strategies, systems-based or case-based teaching (originating in the 1950s) and problem-based learning (adapted to medical education in the 1970s), are then discussed.


Author(s):  
Thao A. Nguyen ◽  
Linn W. Hobbs

The low temperature phase relation of iron sulfide compounds Fe1-xS, with composition ranging from FeS to Fe7S8, has been investigated extensively over the past several decades. Despite these efforts conflicting reports on the stability of low temperature phases still exist and major disagreements between proposed phase diagrams remain unresolved. In this paper we report preliminary findings of our effort to determine whether the low temperature iron sulfide compounds form a homologous series Fen-l,Sn n≥ 8 [1] or a solid solution [2]. We have examined the stability of iron sulfide crystal of composition Fe9S10 using in situ heating experiment and image contrast transmission electron microscopy. We have found that Fe9S10 decomposes to two distinct phases. These two phases are labelled as H and K phases.


2020 ◽  
Vol 5 (1) ◽  
pp. 47
Author(s):  
Michael Murimi

Purpose: This conceptual paper aims at developing theoretical framework for determinants of green management practices in hotels.Methodology: In order to come up with this theoretical framework, the researcher assumes a process of two phases the first stage will involve an explicit examination green management practices literature and what determines such practices in hotels. The succeeding stage was enhancements of the framework. The theoretical structure relies on the past theoretical explanations and empirical analyses in the fields green management and social sciences. Slack’s resource theory and good management competitive theory informs this theoretical framework, the researchers clarify the justification for use of the two theories.Findings: The researcher highlights by what method this reviewed theoretical framework may well be utilized to organize green management practices and its determinants in hotels especially in Kenya. Lastly, the researcher advances propositions that give foundations for empirical study to be carried out in the future.Contribution to theory, practice and policy: Assimilating experiences from numerous disciplines, this paper emphasizes aggregated awareness regarding conceptualization of green management practices in hotels. This work inspires scholars and specialists to understand determinants of green management practices in hotels in Kenya. 


1996 ◽  
Vol 39 (3) ◽  
Author(s):  
I. Stewart

Radiocarbon dating of elevated coastal phenomena along the emergent footwall of the Eliki Fault in the West- em Gulf of Corinth has established a chronology of tectonic emergence during Holocene times. The results confirm -6 m of coastal uplift over the last 3000 years at sites both immediately adjacent to, and more distant from, the offshore l'ault. Although revealing little or no spatial vm.iation along the fault, temporally the data de- fine two phases of enhanced tectonic activity (0-3000 year B.P. and pre- 7-8000 year B.P.) separated by a 4- 5000 year period of tectonic quiescence. Well documented historical surface faulting during the most recent lclive phase testify to the contribution to net uplift played by coseismic increments, but these are considered to be superimposed on significant aseismic movements. While asesismic uplift confuses the palaeoseismic .ecord, correlation of prominent notch levels with dated raised shoreline fauna provides evidence for at least 3 surface faulting events during the past 2500 years.


2001 ◽  
Vol 123 (10) ◽  
pp. 74-75
Author(s):  
John Krawczyk

Premcor Port Arthur Refinery, part of the Premcor Refining Group has been expanding the capacity of a vacuum tower processing almost one million pounds per hour of heavy hydrocarbon feed. The feed is deficient in lighter, more volatile components and is extremely viscous at room temperature. The process is intended to squeeze as much useful fuel as practical out of the oil feed. During the past 5 years, CFD has become noticeably more widespread in solving single-phase flow problems, but progress in solving multiphase flows has been much slower. There are at least three primary solution methods currently available to solve a dispersed multiphase flow problem. The contract with Premcor called for the use of a Eulerian method. Later, as an in-house test, Flow Simulations studied the model of the tower using two other methods.


2021 ◽  
Vol 13 (18) ◽  
pp. 9997
Author(s):  
Rafael Ravina-Ripoll ◽  
María-José Foncubierta-Rodríguez ◽  
Eduardo Ahumada-Tello ◽  
Luis Bayardo Tobar-Pesantez

Currently, age is characterized by implementing business management models based on precarious work and a massive reduction in jobs. This article aims to analyze the degree of happiness perceived in Spanish entrepreneurs, as opposed to that perceived by the employees, and if that happiness is associated with certain sociodemographic variables (such as gender, level of studies, and income level). For this purpose, a brief literature review of the economy of happiness is carried out, considering studies regarding the happiness–entrepreneurship connection over the past few years. With data provided by the Sociological Research Center (C.I.S.) barometer survey, we work in two phases: (1) descriptive and inferential on possible associations between the variables, and (2) the calculation of probabilities through logistic regression. The main result shows that the entrepreneurs with employees are happiest. When the null hypothesis is rejected, the categories that seem to show the most happiness are those with higher education and those in the highest income ranges analyzed. Among the main limitations in this work is the scarcity of bibliographic production on the subject matter of this paper. This paper helps to cover part of this gap.


2006 ◽  
Vol 85 (1) ◽  
pp. 37-60 ◽  
Author(s):  
M.J. Kooistra ◽  
L.I. Kooistra ◽  
P. van Rijn ◽  
U. Sass-Klaassen

AbstractInformation on the vegetation and landscape history of a region is often limited, and available data are hard to interprete. A concept is presented here on how a more comprehensive picture of the structure and development of landscapes and vegetations of the past can be gained by integrating the information of several disciplines. Archaeological field methods have been combined with methods used in landscape studies (geology, soil science, micromorphology) and vegetation studies (ecology, palynology and dendrochronology).This concept has been applied and tested during an integrated study of a buried woodland at Zwolle-Stadshagen (Province of Overijssel, the Netherlands). Many large wood remnants were found in a peat layer preserved below a thick clay deposit. The wood remnants were dated by using dendrochronology to the period between ca. 150 BC and AD 580 (ca. 2200 - 1400 cal. BP). Two phases could be distinguished in the development of the peat. The woodland consisted of a closed stand with ash, alder and oak as main species, in the first phase mostly resembling an alder carr, and in the second one the near-extinctFilipendulo-AlnetumPassage et Hofmann 1968. No evidence of exploitation of the woodland by man nor of animal foraging was found.The followed integrated procedure has led to a more substantiated reconstruction of the palaeo-environment with its wetland wood, but also of the influence of human activities on the palaeo-landscape and its woodlands, that could not have been obtained otherwise.


Sign in / Sign up

Export Citation Format

Share Document