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Search Results: 1 - 10 of 120199 matches for " GD Wang "
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INFLUENCE OF COLD ROLLING TECHNOLOGY ON TEXTURE EVOLUTION OF IF STEEL
JX Li,XH Liu,GD Wang,

金属学报(英文版) , 2002,
Abstract: Two kinds of cold rolling experiments, single cold rolling and double cold rolling, were carried out on one titanium stabilized interstitial free (IF) steel that has been warm rolled at ferrite temperature. The main aim was to investigate the evolution of rolling and annealing textures from the well known behavior observed under single cold rolling condition to the less understood double cold rolling by using orientation distribution function (ODF). In the twice cold rolled samples, the annealing texture comprises only single {111}(110-112) r-fibre texture when it subjected to moderate reduction in the first round of rolling. Accordingly both the once cold rolled sample and the twice cold rolled sample with heavy reduction in the first round of rolling have much complex texture components. They are related to the formation of initial {111} subgrain and the priority growth of stable {111} nucleus.
Reflections on educational research in South Africa
GD Kamper
South African Journal of Education , 2004,
Abstract: A definition of educational research is proposed: Educational research is a particular mode of social service, using rigorous scientific endeavours for the continuous improvement of educational practice. The key components of this definition are used to reflect on educational research in South Africa as (1) a particular mode of social service (with discussion of an ethical code for educational research and national educational research priorities), (2) scientific endeavour (with reference to the nature of educational research, dissertations, scientific articles and research programme reports), and (3) role players in the continuous improvement of educational practice (with reference to policy making and operational practice). It is evident that educational research in South Africa has a noteworthy record of national and regional impact. Present threats to its academic stature and praxiological impact can only be overcome by taking appropriate and timely research management action. South African Journal of Education Vol.24(3) 2004: 233-238
Assessing the Effectiveness of Credit risk Management Techniques of Microfinance firms in Accra
GD Gyamfi
Journal of Science and Technology (Ghana) , 2012,
Abstract: One fundamental problem faced by the Microfinance industry in Ghana during the period 2003-2007 was the technique adopted for credit risk management by the Microfinance firms (MFFs). This problem prompted this deductive study which was to assess the effectiveness of the techniques adopted by the MFFs to manage their credit risks during that period. The research examined the effectiveness of the techniques used by the firms. It was carried out with the support of a 5-member team from the Institute of Professional Studies, Accra, who assisted during the data collection phase of the study. The study was conducted using 20 Micro-firms in Accra which were randomly selected. The study established that the small MFFs were more vulnerable to credit risk than the bigger firms. The study came out with the recommendations that the MFFs should invest in computerised systems that would enable them compute and assess on a continuous basis, their credit risks track records and generate reports on credits granted. The firms should encourage their clients to insure against risk that might affect their businesses, invest in quality manpower so that they could assess their clients efficiently and help in managing their clients risk bearing portfolio. It was also recommended that the continuous use of written policies that guided most of the firms on credit granting should be encouraged by all the firms.
Genetic population structure of the Japanese mitten crab Eriocheir japonica in Japanese islands
YJ Wang, ZQ Han, B Shui, GD Liu, TX Gao, SA Nwafili, S Watanabe, YP Zhang
African Journal of Biotechnology , 2009,
Abstract: Fragment of 376 bp at the mitochondrial ND2 gene was sequenced for 133 individuals of Japanese mitten crab, Eriocheir japonica from 17 localities of Japan and 30 individuals of Chinese mitten crab, E. sinensis from 2 localities of China. In Japanese mitten crab, sequence comparison of this segment revealed 23 polymporphic sites, defining 8 haplotypes. However, 30 individuals of Chinese mitten crab from Dandong and Shanghai shared one haplotype. Haplotype diversity and nucleotide diversity, for the17 populations of Japanese mitten crab ranged from 0 to 0.5833 and from 0 to 0.0025, respectively. AMOVA and pairwise FST revealed significant genetic differentiation between the Okinawa Island and main islands of Japan, and lack of genetic structure among main islands of the Japan populations. Compared with the genetic distance among populations of two species, the degree of genetic divergence between these two groups (Okinawa and main islands of Japan) is equivalent to the genetic distance between congeneric species. Our results failed to demonstrate significant geographical structure in main islands of Japan, indicating that populations of Japanese mitten crab are capable of extensive gene flow among estuaries along the coastal waters.
INFLUENCING FACTORS FOR OBTAINING ULTRAFINE AUSTENITE GRAINS WITH INITIAL MICROSTRUCTURE OF WARM-ROLLED FERRITE/PEARLITE

SJ Yao,LX Du,XH Liu,GD Wang State Key Laboratory of Rolling,Automation,Northeastern University,Shenyang,China,

金属学报(英文版) , 2008,
Abstract: Three warm-rolled ferrite/pearlite microstructures were prepared by rolling at 500℃ and the austenitizing characteristics were discussed in conjunction with deformation during the heating stage. The results indicated that the final austenite grain size was sensitive to the deformation direction of the initial warm-rolled microstructure. The transient microstructure at a given temperature was the most important influencing factor on the anstenitizing characteristic combined with deformation. Moreover, the hot-rolled microstructure also had to be prepared in an optimal state because of its direct effect on the warm-rolled microstructure.
Release of organic nitrogen compounds from Kerogen via catalytic hydropyrolysis
B Bennett, GD Love
Geochemical Transactions , 2000, DOI: 10.1186/1467-4866-1-61
Abstract: Hydropyrolysis refers to pyrolysis assisted by high hydrogen gas pressures (> 10 MPa). In an open-system, fixed-bed reactor configuration with an active catalyst dispersed in the sample, overall conversions are typically greater than 90% for petroleum source rocks with high selectivities to soluble tar products.[1,2] Hydropyrolysis was first developed and applied as an analytical pyrolysis method for liberating covalently-bound hydrocarbon structures from kerogen by Love et al.[3] Subsequent work has demonstrated the unique ability of the hydropyrolysis procedure to release higher yields of aliphatic biomarker hydrocarbons (including n-hydrocarbons, hopanes, steranes and methyl steranes) from immature kerogens in comparison with solvent extraction and conventional pyrolysis methods [4-8] with excellent retention of product structural and stereochemical features. A more recent study has shown that immature biomarker hydrocarbons can also be released from oil and source rock asphaltenes and that the biomarker profiles produced from hydropyrolysis are useful for source correlation purposes.[9]Until now, hydropyrolysis applications in organic geochemistry have exclusively utilised molecular constituents contained within hydrocarbon fractions (aliphatics and aromatics) to provide biogeochemical information. This study represents the first attempt at determining product distributions and potential uses of organic nitrogen-containing constituents of hydropyrolysates. While organic sulfur and oxygen functionalities are susceptible to reductive removal under hydropyrolysis conditions, organic nitrogen compounds (with the exception of amides) are much more inert. Appreciable nitrogen removal from heterocyclic aromatic compounds requires much more vigorous hydro-treatment than the experimental conditions encountered in our hydropyrolysis regime can provide.[10] Hydropyrolysis is, therefore, ideal for liberating heterocyclic organic nitrogen compounds from geomacromolecules and
Effect of Dicamba on the Control of Striga hermonthica check for this species in other resources in Maize in Western Kenya
GD Odhiambo, JK Ransom
African Crop Science Journal , 1993,
Abstract: Dicamba (2-methoxy-3,6-dichlorobenzoic acid) has been shown to be effective in controlling Striga asiatica in maize in the USA. Experiments were therefore conducted from 1990 to 1992 to evaluate its effectiveness against S. hermonthica in Western Kenya. Dicamba was more effective when applied at the rate of 0.75 kg a.i. ha-1 compared to 0.50 kg a.i. ha-1. Applying dicamba over the top of maize plants or post-directing it to the lower plant part did not significantly affect its effectiveness. Application at 30 days after planting was not as effective as delaying the application to 45 days after planting. Crop injury was observed early in a few cases, though the affected plants later recovered and yield was not affected. Dicamba was not persistent as Striga emerged later in the season. Although dicamba can provide some control early in the season, its low persistence implies that other control measures need to be integrated with it to avoid subsequent seed production by the Striga plants that germinate later in the season.
Palliative treatment for HIV-related Kaposi's sarcoma
P Barnardt, GD Georgiev
Southern African Journal of HIV Medicine , 2003,
Abstract:
Pet stores, aquarists and the internet trade as modes of introduction and spread of invasive macrophytes in South Africa
GD Martin, JA Coetzee
Water SA , 2011,
Abstract: Submerged aquatic invasive plant species are increasingly being recognised as a major threat to South African water ways. Pet stores, aquarists and the internet-mediated trade were investigated as pathways for submerged invasive macrophyte introductions into South Africa. Online and manually distributed surveys were used to determine the extent of movement of invasive as well as indigenous submerged plant species in South Africa. Sixty-four stores and twenty-three aquarists were surveyed. Four areas of risk were identified in this study. Firstly, and most importantly, a variety of invasive and/or prohibited plants are sold by pet stores. Secondly, there is a lack of knowledge regarding identification as well as regulation of submerged species, which may then result in the unintentional trade of potentially invasive species. It seems that, in many cases, the pet stores are ignorant or misinformed of the potential dangers, rather than intentionally attempting to breach the legislation. Thirdly, aquarists own, trade and move plants in and around the country, which makes it very difficult to monitor which species are being moved around South Africa and to what extent. Finally, the internet is a pathway of potential concern, but it is difficult to quantify its contribution to the trade of invasive species in South Africa.
Progress in Controlled Gastroretentive Delivery Systems
R Garg, GD Gupta
Tropical Journal of Pharmaceutical Research , 2008,
Abstract: Controlled release (CR) dosage forms have been extensively used to improve therapy with several important drugs. However, the development processes are faced with several physiological difficulties such as the inability to restrain and localize the system within the desired region of the gastrointestinal tract and the highly variable nature of the gastric emptying process. This variability may lead to unpredictable bioavailability and times to achieve peak plasma levels. On the other hand, incorporation of the drug in a controlled release gastroretentive dosage forms (CR-GRDF) which can remain in the gastric region for several hours would significantly prolong the gastric residence time of drugs and improve bioavailability, reduce drug waste, and enhance the solubility of drugs that are less soluble in high pH environment. Gastroretention would also facilitate local drug delivery to the stomach and proximal small intestine. Thus, gastroretention could help to provide greater availability of new products and consequently improved therapeutic activity and substantial benefits to patients. Controlled gastric retention of solid dosage form may be achieved by the mechanisms of floatation, mucoadhesion, sedimentation, expansion or by a modified shaped system. The purpose of this paper is to review the recent literature and current technology used in the development of gastroretentive dosage forms.
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