摘要：Nanozymes, nanomaterials with enzyme-like characteristics,are emerging as novel artificial enzymes (Gao et al., 2007;Manea et al., 2004;Yan, 2018). They are superior to natural enzymes in many ways, such as higher stability, lower cost in preparation, and better robustness toward harsh environments (Wei and Wang, 2013).

摘要：Phase transformation of two-dimensional(2D)nanomaterials can lead to significant changes in electronic and optical properties,which enables the development of novel *** strategies for phase engineering of 2D nanomaterials have drawn considerable attention in recent *** review focuses on the state-of-the-art progress in the phase transformation of 2D nanomaterials and their catalytic ***,the basic concepts of phase transformation and the outstanding electronic and optical properties induced by phase transformation are briefly ***,different strategies for achieving phase transformation are discussed in detail and classified into several types based on their characteristics,including(i)doping,(ii)external fields,(iii)optical irradiation,(iv)strain effect,(v)high-energy particle excitation,and(vi)thermal *** applications of 2D nanomaterials in catalysis based on phase transformation have also been ***,a summary of the technical challenges to phase control in 2D nanomaterials and potential opportunities for developing novel applications is presented.

摘要：Hebei province is located in the middle and lower reaches of the Yellow River, it is one of the birthplace of the Chinese nation. Its superior natural conditions gave birth to the rich and colorful folk culture. In the trend of rapid development of modem economy, more and more people are aware of the important position in the cultural construction and huge potential about the folk culture. But as the result of the modem cultural development faster and faster, many folk culture has been neglected, even under the modem culture.

摘要：Good access to traffic information provides enormous potential for automotive powertrain *** propose a logical control approach for the gearshift strategy,aimed at improving the fuel efficiency of *** driver power demand in a specific position usually exhibits stochastic features and can be statistically analyzed in accordance with historical driving data and instant traffic conditions;therefore,it offers opportunities for the design of a gearshift control *** to the discrete characteristics of a gearshift,the control design of the gearshift strategy can be formulated under a logic system *** this end,vehicle dynamics are discretized with several logic states,and then modeled as a logic system with the Markov process *** fuel optimization problem is constructed as a receding-horizon optimal control problem under the logic system framework,and a dynamic programming algorithm with algebraic operations is applied to determine the optimal strategy *** results demonstrate that the proposed control design has better potential for fuel efficiency improvement than the conventional method.

摘要：The culture-loaded word is a symbol of national culture,since national culture with distinctive features is directly or indirectly reflected in its *** paper is driven both by qualitative research and by quantitative method through the comparison and analysis of translation strategies involved in the five types of material culture-loaded-words,namely,apparel,diet,equipment,architecture and medicine,in The Story of Stone by David *** the final quantitative statistics of the proportion of each translation method,it aims to scrutinize either the broad spectrum or the specific characteristics of those translation strategies so as to provide a perspective for the study of cultural translations.

摘要：This article discusses one of the main strategies which China has implemented to develop its competency in the aviation *** is strategic for China to boost its aviation industry via international cooperation and several models of involvement into the global aviation value chain with leading aviation *** it is depicted as a strategy here,it is not necessary to say that a formal strong national strategy in encouraging ***,it is clearly a way China's aero-industry takes to develop its competency and business at the context it *** an observer's perspective,it is indeed a critical *** article describes this strategy via the context,policies,program cases,as well as the evolution of the cooperation models in order to synthesize the strategy.

摘要：The introduction of productive gardens on public building roofs is an active way to use urban idle space. It has ecological, economic, and social values and helps alleviate many urban problems caused by the rapid advancement of land urbanization. This paper takes the productive rooftop garden of an urban commercial complex as an example, and assesses its development status based on methods including ArcGIS, field research, and questionnaire interviews, combined with the overall aspects of the country and key case analysis. The results indicate several key aspects of the current status of such gardens in China.(1) As affected by natural and social factors, the current spatial distribution of productive rooftop gardens of commercial complexes in Chinese mainland is uneven, with 84.21% located in the southeast coast and the Sichuan region.(2) The operation and development of this type of productive landscape is in good shape. The number of rooftop gardens has continued to increase since 2013, and the scale is generally greater. Currently, the business model which combines nature education and parent-child amusement experience activities is the most stable.(3) Cases in good operating condition tend to have relatively related characteristics in layouts, traffic functions, landscape elements, and space design.(4) Questionnaire interviews show that citizens are highly willing to participate in rooftop productive landscapes, while operators still experience challenges in policies, funds, and planting knowledge in practice. This paper analyses the existing problems in the development status and strategy of the rooftop productive landscape. It proposes complementary optimization strategies to serve as a reference for the rooftop design of commercial complexes and the utilization of a significant amount of idle space on the roofs.

摘要：This paper gives an overview of the Lee Carter method and reiterates the feasibility of using it to construct mortality forecast for the population data. In a first step, the model is fitted in a traditional way and used to extrapolate forecast of the time-varying mortality index. The observed pattern of the mortality rates shows a different variability at different ages, highlighting that the homoscedasticity hypothesis is quite unrealistic. Thus, in a second step, the paper aims to produce more reliable mortality forecasting, focusing on the errors in the estimation of the model parameters. The robustness of the estimated parameter is analysed throughout an experimental strategy which allows to assess the robustness of the Lee Carter model by inducing the errors to satisfy the homoscedasticity hypothesis. The graphical and numerical results are tested by means of a comparison in terms of prediction accuracy.

摘要：This paper presents a thorough design and comparative study of two popular control techniques, i.e., classical Proportional Integral (PI) and RST, for Matrix Converters (MCs) in terms of tracking the reference and robustness. The output signal of MCs is directly affected by unbalanced grid voltage. Some research works have attempted to overcome this problem with PI control. However, this technique is known to offer lower performance when it is used in complex and nonlinear systems. On the other hand, RST control offers better performance, even in case of highly nonlinear systems. Therefore, the RST can achieve better performance to overcome the limitation of PI control of nonlinear systems. In this paper, a RST control method is proposed as output current controller to improve the performance of the MC powered by unbalanced grid voltage. The overall operating principle, Venturini modulation strategy of MC, PI control and characteristics of RST are presented.

摘要：GOF设计模式是软件开发过程中特定环境下解决问题的方法,也是一种高级软件重用技术.利用GOF中的strategy设计模式设计不同的算法,来实现地址定位的基本功能,这不仅能使代码模块化,增强代码的可复用性,从而大幅度地减少了系统的维护成本,提高了算法运行的效率.