Your search
Results 418 resources
-
This work describes a method to study glass transition on native starch powders, based on dynamical mechanical thermal analysis using compression tests, and was applied to wheat flour (13.5% water content). This method will allow the determination of Tg in native (unprocessed) starchy materials, with minimal disturbance of the natural structures. The influence of the test conditions (heating rate, frequency and strain) on the glass transition measurements was determined using factorial designs. The values of Tg determined as the maxima of the energy dissipation (peaks in E″) of native flour and of freeze-dried pre-gelatinized flour were not statistically different (around 64 °C). The heating rate did not affect the measurements in the range tested (0.25 to 1 °C min−1). An interactive effect of the strain amplitude and the frequency was detected. The significance of this interaction can be caused by differences in mechanical energy dissipation, which would indicate that not only temperature but also the total energy input may affect this transition. Slight effects of phase separation between gluten and starch were found on native flour.
-
The protein adsorption capacity of different materials was evaluated to assess their potential efficacy as alternative adsorbents for the removal of proteins from wines, with the purpose of finding suitable low-swelling materials that could be used in a percolated bed. The adsorbents tested were thermally treated sodium bentonite, low-swelling adsorbing clays, ion exchange resins and other protein adsorbents (silica gel, hydroxyapatite and alumina). The materials were evaluated by analysing both the capacity to stabilize untreated white wines, according to a heat test, and by characterizing the adsorption isotherms of bovine serum albumin (BSA) in a model wine (water, ethanol and K-bitartrate). Breakthrough curves in a packed bed were determined experimentally for some materials, showing the influence of the adsorption isotherm shape. Some ion-exchange resins showed a favourable behaviour and have good potential as alternative adsorbents.
-
A questionnaire-based methodology for constructing an overall index of school effectiveness is reported, focusing on within-school conditions of schools, which is currently being used in the Free State of South Africa. The article reports the construction and use of a straightforward instrument for measuring the effectiveness of key aspects of the conditions for school effectiveness in the Free State, using a variety of dimensions. It indicates how this instrument can identify where to intervene in improving schools in order to gain the maximum return on investment of time, effort, development activity and support. The instrument provides aggregated and disaggregated data for individual schools, groups of schools and whole districts, both at a single point in time and over time, thereby enabling the most economical and beneficial development to be planned for targeted individual schools and groups of schools. It enables users to identify the key drivers of the internal school conditions for effectiveness, development and change in schools.
-
This article suggests that attempts to date to unravel the paradox of the Chinese learner are incomplete and inadequately modeled, and that the complexities of the paradox have not yet been fittingly operationalized or alternative explanations of research data investigated. It contends that attempts either to state or to unravel the paradox are chimerical, as they risk oversimplifying a complex phenomenon, the extent and nature of which are insufficiently understood to date. The article argues that investigating the phenomenon of Chinese learners' strong performance in international measures of achievement requires researchers to operate more rigorously in their search for alternative and multiple explanations of results in terms of causality, sampling, and representing heterogeneity. Several explanations of data on the paradox are presented, and alternative explanations which might be more usefully explored are provided. The article also questions the extent to which research on the Chinese learner, with a search for a unitary set of characteristics, is not, itself, prey to totalizing, collectivist ideologies cast in unrealistic meta-narratives. Recommendations are made for further research.
Explore
Academic Units
-
Faculty of Arts and Humanities
(77)
- Adérito Marcos (3)
- Álvaro Barbosa (11)
- Carlos Caires (7)
- Daniel Farinha (1)
- Denis Zuev (2)
- Filipa Martins de Abreu (2)
- Filipe Afonso (2)
- Francisco Vizeu Pinheiro (7)
- Gérald Estadieu (4)
- José Simões (14)
- Nuno Rocha (1)
- Olga Ng Ka Man, Sandra (1)
- Priscilla Roberts (1)
-
Faculty of Business and Law
(90)
- Alessandro Lampo (6)
- Alexandre Lobo (33)
- Angelo Rafael (2)
- Douty Diakite (8)
- Florence Lei (4)
- Ivan Arraut (12)
- Jenny Phillips (9)
- Sergio Gomes (1)
-
Faculty of Health Sciences
(34)
- Angus Kuok (15)
- Cynthia Leong (1)
- Helen Liu (1)
- Vitor Santos Teixeira (9)
-
Faculty of Religious Studies and Philosophy
(49)
- Andrew Leong (1)
- Cyril Law (3)
- Edmond Eh (6)
- Franz Gassner (7)
- Judette Gallares (1)
- Stephen Morgan (9)
- Thomas Cai (2)
-
Institute for Data Engineering and Sciences
(14)
- George Du Wencai (12)
- Liang Shengbin (5)
-
Institute of Science and Environment
(77)
- Ágata Alveirinho Dias (18)
- Chan Shek Kiu (5)
- David Gonçalves (23)
- Karen Tagulao (6)
- Raquel Vasconcelos (8)
- Sara Cardoso (5)
- Shirley Siu (9)
- Thomas Lei (7)
- Wenhong Qiu (1)
-
Library
(2)
- Emily Chan (2)
-
Macau Ricci Institute
(7)
- Stephen Rothlin (7)
-
School of Education
(75)
- Elisa Monteiro (4)
- Hao Wu (2)
- Keith Morrison (36)
- Rochelle Ge (7)
- Susannah Sun (2)
Resource type
United Nations SDGs
- 01 - No Poverty (1)
- 02 - Zero Hunger (1)
- 03 - Good Health and Well-being (10)
- 04 - Quality Education (5)
- 05 - Gender Equality (1)
- 07 - Affordable and Clean Energy (1)
- 08 - Decent Work and Economic Growth (3)
- 09 - Industry, Innovation and Infrastructure (13)
- 10 - Reduced Inequalities (1)
- 11 - Sustainable Cities and Communities (6)
- 12 - Responsable Consumption and Production (3)
- 13 - Climate Action (4)
- 14 - Life Below Water (12)
- 15 - Life on Land (4)
- 16 - Peace, Justice and Strong Institutions (1)
- 17 - Partnerships for the Goals (1)
Cooperation
Student Research and Output
- Faculty of Business and Law (1)
-
School of Education
(3)
- Áine Ní Bhroin (1)
- Emily Chan (2)