年轻语文教师走向成熟的阶段期探讨

年轻语文教师在语文教学上最终走向成熟,不是一朝一夕的事情,往往需要一个漫长的时期,大致可分为以下五个阶段：①懵懵懂懂的模仿期;②中规中矩的发展期;③止步不前的高原期;④突破瓶颈的提高期;⑤无招胜有招的成熟期。以上五个阶段是由不成熟到成熟、不完善到完善的阶段,在此基础上最终实现语文教师教学能力的不断发展和飞跃。

当代广东设计回顾

改革开放以来,广东的设计经历了三个阶段,即引进期、模仿期,再到创新期。这三个过程是广东经济和文化发展到一定阶段的必然产物。企业家应该看到:设计能提高产品的附加值,也能开拓新的市场。设计是一种生产力。

Development and application of an instrument for simulating wetting-drying cycles of expansive soils under loads

Alternating rainfall and evaporation in nature severely impact the shear strength of expansive soils. This study presents an instrument for simulating the effect of wetting–drying cycles on the strength of expansive soils under different loads, and its testing error is verified. With this instrument,direct shear tests were performed on samples experiencing 0-6 cycles under vertical loads of 0 kPa,5 kPa, 15 kPa, and 30 k Pa. The results found that this instrument provides a new method for evaluating the effects of wetting–drying cycles on soils, and this method represents actual engineering conditions more accurately than do preexisting methods. It accurately controls the water content within 1% while simulating the specified loads at different soil depths.Cohesion is significantly affected by wetting–drying cycles, while the friction angle is not as sensitive to these cycles. Decrease in shear strength can be attributed to the fissures in soils caused by wetting–drying cycles. The existence of vertical loads effectively restricts shrinkage fissuring and cohesion attenuation, consequently inhibiting the attenuation of shear strength.

A new method to estimate wave height of specified return period

In this paper, we propose a new method to estimate the wave height of a specifi c return period based on the Hurst rule and a self-affi ne fractal formula. A detailed description of our proposed model is presented in this paper. We use the proposed model to analyze wave height data recorded along the coast of Chaolian Island from 1963 to 1989. The results show that the performance of our proposed model in estimating design wave heights is superior to traditional models.

Amelanotic Malignant Melanoma Mimicking Hemangioma of the Hand: One Case Report and Literature Review

Introduction Malignant melanoma （MM） is one of the most deadly cancerst. Although the disease accounts for only about 4% of skin cancer related cases, it is responsible for about 79% of skin cancer deaths. Early diagnosis of MM is, therefore, essential for appropriate treatment decision and, in turn, may give patients the best chance for prolonged survival. About 6% to 8% of malignant melanomas lack typical pigmentation and tend to be managed as benign lesions, making accurate early diagnosis difficultt61. Though subungual MM is rare,

Simulated effect of sunshade solar geoengineering on the global carbon cycle

Solar geoengineering has been proposed as a potential mechanism to counteract global wanning. Here we use the University of Victoria Earth System Model （UVic） to simulate the effect of idealized sunshade geoengineering on the global carbon cycle. We conduct two simulations. The first is the A2 simulation, where the model is driven by prescribed emission scenario based on the SRES A2 COz emission pathway. The second is the solar geoengineering simulation in which the model is driven by the A2 CO2 emission scenario combined with sunshade solar geoengineering. In the model, solar geoengineering is represented by a spatially uniform reduction in solar insolation that is implemented at year 2020 to offset CO2-induced global mean surface temperature change. Our results show that solar geoengineering increases global carbon uptake relative to A2, in particular CO2 uptake by the terrestrial biosphere. The increase in land carbon uptake is mainly associated with increased net primary production （NPP） in the tropics in the geoengineering simulation, which prevents excess warming in tropics. By year 2100, solar geoengineering decreases A2-simulated atmospheric CO2 by 110 ppm （12%） and causes a 60% （251 Pg C） increase in land carbon accumulation compared to A2. Solar geoengineering also prevents the reduction in ocean oxygen concentration caused by increased ocean temperatures and decreased ocean ventilation, but reduces global ocean NPE Our results suggest that to fully access the climate effect of solar geoengineering, the response of the global carbon cycle should be taken into account.

Modeling and simulation of the spread of H1N1 flu with periodic vaccination

Influenza H1N1 has been found to exhibit oscillatory levels of incidence in large pop- ulations. Clear peaks for influenza H1N1 are observed in several countries including Vietnam each year [M. F. Boni, B. H. Manh, P. Q. Thai, J. Farrar, T. Hien, N. T. Hien, N. Van Kinh and P. Horby, Modelling the progression of pandemic influenza A （H1N1） in Vietnam and the opportunities for reassortment with other influenza viruses, BMC Med. 7 （2009） 43, Doi： 10.1186/1741-7015-%43]. So it is important to study seasonal forces and factors which can affect the transmission of this disease. This paper studies an SIRS epidemic model with seasonal vaccination rate. This SIRS model has a unique disease-free solution （DFS）. The value Ro, the basic reproduction number is obtained when the vaccination is a periodic function. Stability results for the DFS are obtained when R0 〈 1. The disease persists in the population and remains endemic if R0 〉 1. Also when R0 〉 1 existence of a nonzero periodic solution is proved. These results obtained for our model when the vaccination strategy is a non-constant time-dependent function.