工作导向和双境融合下建筑材料与检测课程教改研究

建筑材料与检测是高职建筑工程技术专业中非常重要的一门专业基础课程,对学生取得施工员上岗资格证考试中占有很大比例。基于高职建工专业人才培养要求和就业导向,结合我校建筑工程技术专业课程教学改革和学生就业岗位特点,采用工作导向和双境融合的理实一体化教学模式开展教学工作,着重于实践教学方面,加大学生实训动手能力和自主管理创新能力,结合过程性考核方式进行课程教学效果评价,通过项目为载体、任务为驱动的教学思路开展教学改革,提高高职学生对该门课程的掌握。

职业教育“双场融合三境合一”课程改革创新

"双场融合",即学场和职场的融合统一。"三境合一",即仿境、情境和实境一体化育人。它是与"产教融合、校企合作、工学结合"高度契合的课程改革创新模式,与职业教育本质特色具有内在自洽性。"双场融合"的践行要做好学科知识向工作知识转化;课程标准与职业标准对接;学习过程与工作过程融合。"三境合一"的实践,要做好仿境育人、情境育人和实境育人课程实施工作。

资本逻辑与道德构境

资本是资本主义社会里占据主导话语的控制方案和统治方式,作为一种现实性的"同质化"的抽象力量和一种"可感觉而又超感觉的物",资本宰制、统摄和操控着人的世界及其历史。从历史视域审视资本的道德实践,资本以其增值本性所导致的剥削和贫困而呈现出罪恶的面孔,同时也因带来的发展、竞争、繁荣与公平而凸显出善的另一面。资本的功利化趋势使世界成为世界历史。在经济全球化这一基本态势下审视资本的道德面貌,我们必须积极肯定资本的全球流动给人类生活带来的变化与效益,同时也必须正视资本追求快感所带来的对工具理性的张扬而对人的全面发展的伤害与破坏,在批判和超越资本逻辑的理念下理性地面对资本。

中学音乐教学的几点思考

“为了每一位学生的发展”是新课程的最高宗旨和核心理念。中学生由于年龄的特点以及升学的压力,出现课堂气氛冷淡、教学效率低下等现实问题。音乐教育者应该针对这些问题认真思考如何通过精心的教学设计及丰富的教学方法等研究,努力的改变现状,提高教学效率。

Spatial and environmental effects on plant communities in the Yellow River Delta, Eastern China

Types and structure of plant communities in the Yellow River Delta were investigated by using detrended canonical correspondence analyses （DCCAs） and a two-way indicator species analysis （TWINSPAN）. The distribution pattern and influential factors of the plant communities were also analyzed by testing elevation, slope, soil characteristics, longitude and latitude of 134 vegetation samples collected by representative plot sampling methods. Results showed that all the 134 vegetation samples could be divided into seven vegetation groups, separately dominated by Robinia pseucdoacacia, Imperata cylindrical, Miscanthus saccharifleus, Suaeda salsa, Aeluropus sinensis, Phragmites australis and Tamarix chinensis. The vegetation distribution pattern was mainly related to elevation, ground water depth and soil characteristics such as salinity and soluble potassium. Among the factors affecting distribution pattern of the plant communities, the species matrix explained by non-spatial environmental variation accounts for 45.2% of total variation. Spatial variation and spatial-structured environmental variation explain 11.8%, and 2.2%, respectively. Remained 40.8% of undetermined variation is attributed to biological and stochastic factors.

Inverting reservoir parameters in a two-phase fractured medium with a niche genetic algorithm

In this paper we calculate a synthetic medium surface displacement response that is consistent with real measurement data by applying the least-square principle and a niche genetic algorithm to the parameters inversion problem of the wave equation in a two-phase medium. We propose a niche genetic multi-parameter （including porosity, solid phase density and fluid phase density） joint inversion algorithm based on a two-phase fractured medium in the BISQ model. We take the two-phase fractured medium of the BISQ model in a two- dimensional half space as an example, and carry out the numerical reservoir parameters inversion. Results show that this method is very convenient for solving the parameters inversion problem for the wave equation in a two-phase medium, and has the advantage of strong noise rejection. Relative to conventional genetic algorithms, the niche genetic algorithm based on a sharing function can not only significantly speed up the convergence, but also improve the inversion precision.

Alliance-Authentication Protocol in Clouds Computing Environment

Security has been regarded as one of the hardest problems in the development of cloud computing. This paper proposes an AllianceAuthentication protocol among Hybrid Clouds that include multiple private clouds and/or public clouds. Mu tual authentication protocol among entities in the IntraCloud and InterCloud is proposed. Blind signature and bilinear mapping of automorphism groups are adopted to achieve the InterCloud Alli anceAuthentication, which overcome the complexi ty of certificate transmission and the problem of communication bottlenecks that happen in tradi tional certificatebased scheme. Blind key, instead of private key, is adopted for register, which avoids

Thermal Modal Analysis of Doubly Curved Shell Based on Rayleigh⁃Ritz Method

The doubly curved shell(DCS)is a common structure in the engineering field.In a thermal environment,the vibration characteristics of the DCS will be affected by the thermal effect.The research on the vibration characteristics of DCS in thermal environment is relatively limited.In this paper,the thermal strain and the change of Young’s modulus caused by the changing of temperature are studied,and the DCS energy equation is established systematically.The displacement tolerance function of the DCS is constructed by the spectral geometry method,and the natural frequencies and mode shapes of the DCS with different structural parameters,such as thicknesses,ratios of R_(a)/R_(b) and a/b,at different temperatures are solved by the Rayleigh-Ritz method.The results show that the natural frequency of the DCS decreases with the increasing temperature,R_(a)/R_(b) and a/b ratios,and increases with the increasing thickness.

Site selection of emergency material warehouse under fuzzy environment

The objective of this work was to determine the location of emergency material warehouses. For the site selection problem of emergency material warehouses, the triangular fuzzy numbers are respectively demand of the demand node, the distance between the warehouse and demand node and the cost of the warehouse, a bi-objective programming model was established with minimum total cost of the system and minimum distance between the selected emergency material warehouses and the demand node. Using the theories of fuzzy numbers, the fuzzy programming model was transformed into a determinate bi-objective mixed integer programming model and a heuristic algorithm for this model was designed. Then, the algorithm was proven to be feasible and effective through a numerical example. Analysis results show that the location of emergency material warehouse depends heavily on the values of degree a and weight wl. Accurate information of a certain emergency activity should be collected before making the decision.

Early-Time High-Altitude Electromagnetic Pulse Environment(E1) Simulation with a Bicone-Cage Antenna

The simulation of the early-time High-altitude Electromagnetic Pulse （HEMP） environment （El） with bicone-cage antenna in free space requires utilization of the spherical wave to reproduce the boundless plane wave. The transient radiation of the antenna above the lossy ground is computed using the Finite-Difference Time-Domain （FDTD） method The determining factors of the field waveform are explored and analysed on the basis of the physical evolution process of the transient radiation. The typical waveform of the electric field and the field distribution characteristics, both of which are important for HEMP simulator design and the effect tests, are presented. The study indicates that the simulation should be analysed from the perspective of both environment building and simulator applications.

Status quo and Major Causes of Traditional Sacred Natural Sites in Xishuangbanna Prefecture

In the research, sacred natural sites in the areas where Dai people, Hani people, Blang people and Zhuang people live mainly surveyed, covering 819 natural villages, 152 village committees and 31 towns. Presently, the area of sacred natural sites is only 1% of that in 1957 and the reduction of area is mainly caused by concept weakening, population increasing and economic development, as well as historical factors. Hence, it is recommended to strengthen management on sacred natural sites, in terms of formulating village rules or agreements and strengthening promotion.

Quantum Entanglement and Nonlocality Properties of Two-Mode Squeezed Thermal States in a Common-Reservoir Model

We study a system consisting of two identical non-interacting single-mode cavity fields coupled to a common vacuum environment and provide general, explicit, and exact solutions to its master equation by means of the characteristic function method. We analyze the entanglement dynamics of two-mode squeezed thermal state in this model and show that its entanglement dynamics is strongly determined by the two-mode squeezing parameter and the purity. In particular, we find that two-mode squeezed thermal state with the squeezing parameter r ≤ -（1/2） In √u is extremely fragile and almost does not survive in a common vacuum environment. We investigate the time evolution of nonlocality for two-mode squeezed thermal state in such an environment. It is found that the evolved state loses its nonlocality in the beginning of the evolution, but after a time, the revival of nonlocality can occur.

Bilingual Education in the Context of China A Review and Its Implication

Bilingual education has been a buzzword in the mainland of China since the 21st century. China has the greatest population, who learn English as foreign language. Kindergartens and schools of all stages have English course. Therefore, there have been extensive studies and researches concerning bilingual education in the context of China. The effectiveness of bilingual education should be discussed and tested by more relevant studies. This paper introduces linguistic policies and phenomena in China, and reviews the current studies on bilingual education in China both at home and abroad. Finally, some implications for English teaching are put forward to inform teaching practitioners.

Cyanide Contents of Leaves of Commonly Consumed Cassava Varieties from Three Geographical Regions of Ghana

Consuming a cyanogenic plant is an etiological factor to the persistence of iodine deficiency in the post salt iodization phase. Ghana, notably the Northern belt, still reports of iodine deficiency after 14 years of mandatory consumption of iodized salt by an Act of Parliament. The study aimed at determining the cyanide contents of leaves of commonly consumed cassava varieties in Ghana and investigating the effects of some environmental factors on cyanide content. Three communities each from Southern, Middle and Northern Ghana served as the study sites from where young, non-diseased and fully-spread cassava leaves were sampled from plants of commonly consumed cassava varieties. Cyanide was analyzed by the standard color^metric method based on the chloramine-T/pyridine-barbituric acid protocol （4500-CN E）. Cassava leaves from Northern Ghana had significantly higher mean cyanide content （177.22 ± 20.82 ppm） than those from Middle （130.83± 33.00 ppm） and Southern Ghana （127.24 ± 37.54 ppm） （P 〈 0.001）. Two-factor ANOVA showed significantly higher adverse environmental effects on cyanide contents of leaves of unimproved cassava varieties than improved ones （R2 = 0.627, P = 0.023）. From multiple regression analysis, temperature was the most significant environmental factor explaining 33% of the variability in cyanide content （R2 = 0.331, P = 0.002）, followed by altitude （R2 = 0.106, P = 0.049） and rainfall （R2 = 0.084, P = 0.062）. The high cyanide contents of cassava leaves from Northern Ghana, due principally to the high atmospheric temperature, may be a contributory factor to the high prevalence of goiter and the persistence of iodine deficiency in that geographic region.

Controversy of International Carbon-motivated Border Tax Adjustment and Its Impact on China's Manufacturing Industries

Carbon-motivated border tax adjustment （BTA） aims to compensate for the loss of competitiveness of carbon intensive products due to carbon dioxide abatement actions. Based on the analysis of the international background of carbon-motivated BTAs, this paper discusses the fundamental motivation leading to US policy transformation, the potential impacts of the policy on China＇s manufacturing industries, and the compatibility of the policy to WTO rules. Carbon-motivated BTAs violate the fundamental principle of the UNFCCC, and potentially conflict with the core WTO principle of non-discrimination reflected in the GATT Articles 1 and III. However, Article XX of the GATT may be applicable. Thus, the author suggests several measures to alleviate the impacts of carbon-motivated BTAs, and puts forward countermeasures based on carbon consumption per capita.

Electromagnetic Environmental Impact of 500-kV Double -Circuit Transmission Lines

The strength of the power frequency electric intensity and magnetic field of the 500-kV double circuit transmission lines was calculated by using the equivalent charge method and the Ampere's Law, and the environmental impact factors of the fields were evaluated. By optimizing the phase sequence, the frequency electric intensity and magnetic field strength can be reduced. Within a distance of 25 m from the center of the transmission line, the power frequency electric intensity and magnetic field strength fall off sharply with the distance increase. Finally, the best phase sequence and the minimum ground clearance of the transmission lines were obtained to meet the requirements of the least impact on envionment.

Recurrence and invariant measure of Markov chains in double-infinite random environments

The concepts of π-irreduciblity, recurrence and transience are introduced into the research field of Markov chains in random environments.That a π-irreducible chain must be either recurrent or transient is proved, a criterion is shown for recurrent Markov chains in double-infinite random environments, the existence of invariant measure of π-irreducible chains in double-infinite environments is discussed,and then Orey's open-questions are partially answered.

Jurassic rocks,bivalves,and depositional environments of the source area of the Yangtze River,Qinghai Province,western China

Jurassic rocks are abundantly developed in the source area of the Yangtze River,South Qinghai,with the greatest thickness of 6311 m,including five stratigraphic units:Qoimaco Formation,Buqu Formation,Xiali Formation,Suowa Formation,and Xueshan Formation.Based on sufficient fossils of bivalves,ammonites,and brachiopods,the major part of these formations is ascribed to the Middle Jurassic Bathonian to Callovian.No diagnostic fossils have been found from the Lower Qoimaco Formation or Upper Xueshan Formation,which could possibly contain in part Bajocian and Oxfordian taxa respectively.

Two-sided and Heterogeneous Effects of Environmental Regulation on the Technological Innovation Efficiency of Iron and Steel Enterprises in China

In this study,the relationship between environmental regulations and technological innovation efficiencyis empirically examined via panel data from 33 iron and steel enterprises(ISs)in China between 2015 and 2021.The results show that the average“innovation compensation effect”of environmental regulations on the technological innovation efficiency of ISs exceeds the average“compliance cost effect”,thus resulting in a clearly positivenet effect.Both the two-sided effects and the net effects vary across different years,geographical regions,andtypes of property rights.As the quantile of technological innovation efficiency increases,the positive influence ofenvironmental regulations tends to increase.Furthermore,the strengthening of financing constraints and firmcompetitiveness enhances the positive impact of environmental regulations on the technological innovation efficiency of ISs.Additionally,a double-threshold effect of environmental regulations on the technological innovationefficiency of ISs is revealed in this study.The realisation of the Porter hypothesis occurs when financing constraintsand firm competitiveness fall within specific threshold intervals.This research not only deepens our understandingof the relationship between environmental regulations and the technological innovation efficiency of ISs but alsoprovides valuable policy insights for optimising environmental regulations to facilitate targeted improvements in thelevel of technological innovation efficiency.