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Search Results: 1 - 10 of 4576 matches for " Zimian Ni "
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Properties and characterization of Au3+-adsorption by mycelial waste ofStreptomyces aureofaciences
Liu Yueying,Fu Jinkun,Hu Hongbo,Tang Dingliang,Ni Zimian,Yu Xinsheng
Chinese Science Bulletin , 2001, DOI: 10.1007/BF02900657
Abstract: Mycelial waste ofStreptomyces aureofaciences procured from the aureomycin fermentation industry is used as biosorbent for Au3+. The properties of Au3+ adsorption by the mycelial waste are studied. The results indicate that the optimum pH value of Au3+ adsorption is 3.5. The biosorption is a rapid and non-temperature-dependent process. The biosorptive capacity with 45.6 mg/g and efficiency with 91.2% are achieved under the conditions of pH 3.5 and 30° C for 45 min, in which the ratio is 50 mg/g dry weight for the concen trations of initial Au3+ and the mycelial waste. The Au3+ ions adsorbed on the mycelial waste can be eluted. The observation in a transmission electron microscope shows that the Au3+ ions can be reduced to Au particles by the mycelial waste and the Au° can become gold crystals with different forms and sizes. X-ray photoelectron spectroscopy analysis further proves that the Au3+ can be reduced to Au° by the mycelial waste.
Adsorption and reduction of palladium (Pd2+) by Bacillus licheniformis R08
Zhongyu Lin,Chaohui Zhou,Jianming Wu,Hu Cheng,Bilan Liu,Zimian Ni,Jianzhang Zhou,Jinkun Fu
Chinese Science Bulletin , 2002, DOI: 10.1360/02tb9279
Abstract: Preliminary study on the mechanism of Pd2+ biosorption by resting cells of Bacillus licheniformis R08 biomass has been carried out by means of chemical kinetics and AAS, TEM, XRD and FTIR methods. The results showed that at 30°C and pH 3.5, when dry R08 biomass powder (800 mg/L) was mixed with Pd2+ (100 mg/L) for 45 min, the rate constant k of biosorption of Pd2+ attained a maximum of 5.97 × 10 2 min 1 and the half life period of the reaction reached 12 min. The part of Pd2+ adsorbed by R08 biomass was reduced to elemental, cell-bound Pd at the same condition. The cell wall of R08 biomass was the primary location for accumulating Pd2+, and aldoses, i. e. hydrolysate of a part of polysaccharides on the peptidoglycan layer in the acidic medium, serving as the electron donor, in situ reduced the Pd2+ to Pd0.
A Light-weight Relevance Feedback Solution for Large Scale Content-Based Video Retrieval
Zimian Li,Ming Zhu
International Journal of Computer Science Issues , 2013,
Abstract: This paper addresses the problem of large scale content-based video retrieval with relevance feedback. We analyze the common methods which leverage local feature detectors to extract feature descriptors from video collections and perform multi-level matching after indexing and retrieval of feature vectors. Instead of learning similarity-preserving codes, we introduce the relevance feedback approach in a light-weight way. A relevance model is proposed to merge semantic similarity with the original distance matching at descriptor level. By learning several weights using canonical correlation analysis (CCA), the resulting candidate list of similar videos changes according to relevance feedback. Finally, we demonstrate the improvement of the proposed method by experiments on a standard real world dataset.
Organ-Tissue Level Model of Resting Energy Expenditure Across Mammals: New Insights into Kleiber's Law
ZiMian Wang,Junyi Zhang,Zhiliang Ying,Steven B. Heymsfield
ISRN Zoology , 2012, DOI: 10.5402/2012/673050
Abstract: Background. Kleiber’s law describes the quantitative association between whole-body resting energy expenditure (REE, in kcal/d) and body mass (M, in kg) across mature mammals as REE . The basis of this empirical function is uncertain. Objectives. The study objective was to establish an organ-tissue level REE model across mammals and to explore the body composition and physiologic basis of Kleiber’s law. Design. We evaluated the hypothesis that REE in mature mammals can be predicted by a combination of two variables: the mass of individual organs/tissues and their corresponding specific resting metabolic rates. Data on the mass of organs with high metabolic rate (i.e., liver, brain, heart, and kidneys) for 111 species ranging in body mass from 0.0075 (shrew) to 6650?kg (elephant) were obtained from a literature review. Results. predicted by the organ-tissue level model was correlated with body mass (correlation ) and resulted in the function , with a coefficient and scaling exponent, respectively, close to 70.0 and 0.75 ( ) as observed by Kleiber. There were no differences between and calculated by Kleiber’s law; was correlated ( ) with . The mass-specific , that is, , was correlated with body mass ( ) with a scaling exponent ?0.246, close to ?0.25 as observed with Kleiber’s law. Conclusion. Our findings provide new insights into the organ/tissue energetic components of Kleiber’s law. The observed large rise in REE and lowering of REE/M from shrew to elephant can be explained by corresponding changes in organ/tissue mass and associated specific metabolic rate. 1. Introduction Resting energy expenditure (REE), defined as the whole-body energy expenditure under standard conditions, is the largest fraction of total energy expenditure. Body mass was applied early in exploring the quantitative association between REE and body composition. The best empirical fit between REE (in kcal/d) and body mass (M, in kg) from mouse to elephant with a ~330,000-fold difference in body size was derived by Kleiber [1, 2] and Brody [3], Equation (1) is the well-known Kleiber’s law or power law, one of the most widely discussed rules in bioenergetics [2, 4]. Based on (1), Kleiber’s law can also be expressed in terms of mass-specific REE, According to Kleiber’s law, small mammals (e.g., shrew) have lower REE but higher REE/M than do large mammals (e.g., elephant). Although many investigators have attempted to clarify plausible mechanisms, a full understanding of Kleiber’s law is still uncertain and represents a knowledge gap in the studies of bioenergetics [12]. Primary
Do Changes on Sovereign Credit Rating Have Impacts on the Interdependence of Stock Markets in the Asian-Pacific Emerging Markets?  [PDF]
Bo Ni
Modern Economy (ME) , 2017, DOI: 10.4236/me.2017.83025
Abstract: This paper investigates the asymmetric effects of upgrade and downgrade of the sovereign credit rating on regional interdependence of seven emerging stock markets in the Asian Pacific Area. Firstly, by comparing the cross-country correlation matrices of stock market index returns on event days and none event days, we find out increases in correlations in both upgrade and downgrade rating days but the frequency of decreasing correlations is significantly higher in downgrade rating days. Secondly, with a regression analysis taking advantage of time-varying conditional correlations of each stock market index with regional market index, we discover a significant increase in the correlations of most countries because of the common information effect triggered by the upgrade rating events, while for the downgrade rating events, dominant differential information effect results in decrease in the correlations. Moreover, in terms of effects of changes on sovereign ratings from other regional countries, downgrade rating events are more influential. Lastly, we apply an Error Correction Model and discern a significant long-run effect caused by the changes on the sovereign credit ratings and significant short-run transitory effect only exists in the Thailand stock market, the source of Asian Financial Crisis, which supports the financial contagion theory.
Study on the Role of Technological Innovation in Business Administration  [PDF]
Haixing Ni
Modern Economy (ME) , 2018, DOI: 10.4236/me.2018.910100
Abstract: With China’s economic development and social progress, China has made great achievements in business administration, and companies in China have grown rapidly. At the same time, companies also face a variety of challenges. While, business administration can enable companies to develop rapidly. Innovative business management could give full of vitality to the development of enterprises. And it has become the trend today. This paper first expounds the current development status of enterprise business management, then analyzes the role of technological innovation in business management, then discusses the strategies of the application of scientific and technological innovation in three aspects, that is, increasing the emphasis on the application of scientific and technological innovation, strengthening the cultivation of talents, and increasing the financial investment of scientific and technological innovation. At last, taking Xiaomi as an example, this paper analyzes the importance of?technological innovation in business management. Innovation in business management science and technology can effectively make enterprises sustainable development.
Estimation of Total Body Skeletal Muscle Mass in Chinese Adults: Prediction Model by Dual-Energy X-Ray Absorptiometry
Xinyu Zhao, ZiMian Wang, Junyi Zhang, Jianming Hua, Wei He, Shankuan Zhu
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0053561
Abstract: Background There are few reports on total body skeletal muscle mass (SM) in Chinese. The objective of this study is to establish a prediction model of SM for Chinese adults. Methodology Appendicular lean soft tissue (ALST) was measured by dual energy X-ray absorptiometry (DXA) and SM by magnetic resonance image (MRI) in 66 Chinese adults (52 men and 14 women). Images of MRI were segmented into compartments including intermuscular adipose tissue (IMAT) and IMAT-free SM. Regression was used to fit the prediction model . Age and gender were adjusted in the fitted model. The piece-wise linear function was performed to further explore the effect of age on SM. ‘Leave-One-Out Cross Validation’ was utilized to evaluate the prediction performance. The significance of observed differences between predicted and actual SM was tested by t test and the level of agreement was assessed by the method of Bland and Altman. Results Men had greater ALST and IMAT-free SM than women. ALST was the primary predictor and highly correlated with IMAT-free SM (R2 = 0.94, SEE = 1.11 kg, P<0.001). Age was an additional predictor (SM prediction model with age adjusted R2 = 0.95, SEE = 1.05 kg, P<0.001). There was a piece-wise linear relationship between age and IMAT-free SM: IMAT-free SM = 1.21×ALST?0.98, (Age <45 years) and IMAT-free SM = 1.21×ALST?0.98?0.04× (Age?45), (Age ≥45years). The prediction performance of this age-adjusted model was good due to ‘Leave-One-Out Cross Validation’. No significant difference between measured and predicted IMAT-free SM was detected. Conclusion Previous SM prediction model developed in multi-ethnic groups underestimated SM by 2.3% and 3.4% for Chinese men and women. A new prediction model by DXA has been established to predict SM in Chinese adults.
Promoting the Quality of Chinese Higher Vocational Education by General Education  [PDF]
Yongbo Lai, Hongyao Ni
Creative Education (CE) , 2012, DOI: 10.4236/ce.2012.37176
Abstract: Due to the quality lack of Chinese higher vocational education, this paper analyzes the quality of the higher vocational education, from the point of dominant and recessive qualities of cultivating talents respectively. Based on the present situation of vocational education, this paper puts forward to apply the general education of international advanced universities, to improve the quality of education, moreover, proposed practical ways to implement intrinsic quality development of higher vocational education in China.
Review of Ecological Floating Bed Restoration in Polluted Water  [PDF]
Yu Deng, Fuquan Ni
Journal of Water Resource and Protection (JWARP) , 2013, DOI: 10.4236/jwarp.2013.512128
Abstract:

Using Ecological Floating Bed (EFB) to purify polluted water is a process of ecological restoration at virgin position, as well as a complicated physical, chemical and biological process. Its core is utilizing aquatic plants and root’s microbes to absorb nitrogen and phosphorus elements, degrade organic matter and enrich heavy metal. EFB has been applied to some water pollution control projects at home and abroad, and has got several achievements. However, there are some factors influenced the removal rate of pollutants, including plants, temperature, seasons, processing time, coverage and initial concentration of pollutants. In the future, the development orientation has been prospected from plant and its combinations, the transformation of EFB structure and the utilization of aquatic resources, and probed the technology of EFB’s building and management, to implement the win-win of landscape benefit and ecological function.

Hepatitis B Vaccination Rate among Medical Students at the University of Port Harcourt Teaching Hospital (Upth)  [PDF]
Ni Paul, O. Peterside
World Journal of Vaccines (WJV) , 2015, DOI: 10.4236/wjv.2015.51001
Abstract: Background: Hepatitis B virus (HBV) infection causes significant morbidity and mortality worldwide. Occupational exposure of health care workers and medical students increases their risk of acquiring HBV infection, and many authorities recommend vaccination. However, significant proportions of health care workers do not receive HBV immunization, and remain at increased risk to HBV infection. Objective: To determine the hepatitis B vaccination rate among Medical students at the University of Port Harcourt Teaching Hospital (UPTH) and to determine their knowledge of HBV infection. Result: Three hundred and sixteen medical students at UPTH completed self-administered questionnaires which included questions about demographic characteristics, HBV vaccination status, knowledge of hepatitis B vaccine and reasons for not receiving the vaccine. All (100%) of the respondents had heard of hepatitis B vaccine. Two hundred and twenty two (70.2%) of them thought they were at risk of acquiring hepatitis. Two hundred and seventy (85.4%) had received at least one dose of hepatitis B vaccine while 46 (14.6%) had never received the vaccine. One hundred and ten of the respondents had received 3 doses of hepatitis B vaccine, giving a vaccination rate of 34.8%. One hundred and sixteen (36.7%) had received 2 doses, while 44 (13.9%) had received one dose. There was a statistical significant relationship among marital status (p = 0.01), clinical level (p = 0.02) and hepatitis B vaccine uptake. Conclusion: The hepatitis B vaccination rate among medical students at the University of Port Harcourt Teaching Hospital is low. National and institutional legislation for adult vaccination against Hepatitis B should be promulgated for those at higher risk.
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