Longitudinal vibration characteristics of a tapered pipe pile considering the vertical support of surrounding soil and construction disturbance

This research is concentrated on the longitudinal vibration of a tapered pipe pile considering the vertical support of the surrounding soil and construction disturbance.First,the pile-soil system is partitioned into finite segments in the vertical direction and the Voigt model is applied to simulate the vertical support of the surrounding soil acting on the pile segment.The surrounding soil is divided into finite ring-shaped zones in the radial direction to consider the construction disturbance.Then,the shear complex stiffness at the pile-soil interface is derived by solving the dynamic equilibrium equation for the soil from the outermost to innermost zone.The displacement impedance at the top of an arbitrary pile segment is obtained by solving the dynamic equilibrium equation for the pile and is combined with the vertical support of the surrounding soil to derive the displacement impedance at the bottom of the upper adjacent segment.Further,the displacement impedance at the pile head is obtained based on the impedance function transfer technique.Finally,the reliability of the proposed solution is verified,followed by a sensitivity analysis concerning the coupling effect of the pile parameters,construction disturbance and the vertical support of the surrounding soil on the displacement impedance of the pile.

Consideration of the Application and Risk Prevention of VAT Tax Rebate Policy for Construction Enterprises at the End of the Period

The“Announcement on Deepening the Value-Added Tax Reform”clearly outlines the preferential policy regarding incremental retention tax rebates.With the advancement of value-added tax(VAT)reform and the improvement of VAT legislation in China,VAT tax planning for construction enterprises,particularly related to retained tax credits,has become routine.This paper,focusing on the characteristics of construction enterprises,analyzes VAT retained tax credits at the end of the period,the status of tax refunds,practical issues,and related processes,and offers suggestions for policy application and risk prevention.

Study on the Impact of Collective Commercial Construction Land Entering the Market on Rural Residents’Income:Taking Deqing County,Zhejiang Province as an Example

The entry of collective construction land for business purposes is an important measure for deepening the reform of the rural land system,promoting the flow of urban and rural factors,and realizing rural revitalization.Since the production of the first batch of pilot projects in 2015,33 county-level cities have participated in the pilot policy by 2023.Deqing County,Zhejiang Province,as the first area to participate in the pilot project,aims to achieve more fruitful results.This paper first examines how promoting farmers’income through the market entry of agricultural land can be achieved,then uses the synthetic control method to quantitatively study the impact of collective operational construction land on farmers’income using panel data from 2011 to 2019,and finally proposes relevant suggestions from the perspective of system reform.

From Traditional Agriculture to Landscape Agriculture——About the Aesthetics in the Construction of New Socialist Countryside

Characteristics of traditional agriculture were analyzed from the perspective of history and culture,by comparing modern agriculture and traditional culture,it was proposed that modern agriculture focuses more on landscape,the main contents and era features of landscape agriculture were elaborated as well as the significance of constructing new socialist countryside,and relevant suggestions were proposed for building new land-scape countryside.

Study on the Planning of Suburban New Countryside Construction with Yufa Township of Beijing City as a Case

The construction of new socialist countryside should be realized by diversified means due to the characteristics of different regions. From the perspective of planning, Liugezhuang Village of Yufa Township in Daxing District, Beijing City was taken as a case to study the characteristics and contents of suburban new countryside construction planning, and several suggestions were put forward for the implementation and management of planning.

Study on New Rural Residential Construction and Residential Culture in Longnan Region of Gansu Province

Residential construction is the important part of new rural construction,also the great event relating to the living of the general farmers,but also the physical appearance of rural area.Taking advantage of the post-quake reconstruction and new rural construction,combining with the inheritance and development of traditional culture,the new rural construction should be the first to be launched,constructing applicable and beautiful residences with rich residential cultural connotation.Longnan Region is economically underdeveloped,but it is with a beautiful environment and the forest coverage rate is high.Therefore,the discussion and investigation on the residential style and culture in this district are of great significance to the construction of the ethnic,economic and beautiful residential construction mode during new residential construction in Longnan Region.Through the analysis of the economic situation,environmental condition of Longnan Region and the analysis of the structure,function,architectural composition and existing problems of the present residence,the author discussed the style and structure of the present residence.The author also studied the protection and inheritance of the residential culture in Longnan Region,emphasizing the inheritance and development of residential culture and gave new cultural connotation to the new rural residential construction.All these provided reference for the new rural construction and planning in this area.

The Study on Landscape Factors,Pattern and Design in New Countryside Construction in Mountainous Areas of China

With the vigorous development of China urbanization and increase of people's environmental consciousness,landscape design had received more and more attentions in urban construction and planning.However,the planning for mountainous new countryside construction and landscape design had not been emphasized.Hence,how to make use of natural and cultural landscape factors in mountainous areas to conduct landscape design in new countryside construction was an issue needed to be highlighted.According to the field study of natural villages and residences of Longnan City in Gansu Province,the paper had discussed the composition of mountainous settlements and residences,the composition of mountainous rural landscape factors and landscape planning principles,hoping to provide reference for rural landscape design and new countryside construction.

Study on Construction Strategy of Rainwater Landscape System in Urban Residential Community

On the basis of analyzing the function and restriction conditions of water features in residential community, the feasibility and specific strategies of using rain- water to construct the waterscape system in residential community were proposed, with the aim to deal with the problems of urban water shortage, urban waterlogging and initial rainwater non-point source pollution.

Development and Utilization of Catering Culture and New Countryside Construction in Guizhou of China

The paper pointed out that catering cultural resources played an important role in vitalizing Guizhou,promoting rural tourism development,innovating characteristic mountainous economy,increasing villagers' income and constructing ecological civilization.It emphasized that development and utilization of catering resources could contribute to promotion of economic development and preservation of good ecology on condition that natural environment was not destroyed.Advantages and potentials for development and utilization of catering culture in Guizhou had been analyzed,which lied in diversified food production methods,abundant food materials,obvious regionality,colorful national catering cultures,green foods and so on.It proposed that Guizhou catering culture had gained attention of relevant departments currently and had been developed to a certain degree.Its development status was introduced in brief.On this basis,it put forward relevant strategies,emphasized depending on government's guidance,stimulating villagers' activity,rooting in the soil of Guizhou historical culture,paying attention to establishment and protection of native catering cultural brand,and doing well in sales promotion.

Validity Considerations in CET-4 Banked Cloze Construction

In order to assess college students'overall language proficiency,a new format,banked cloze,is included in the revised CET-4.Based on the previous studies on banked cloze in China,this paper discusses on how to construct highly valid CET-4 banked cloze in line with the revised CET Syllabus(2006).

How does the construction of China’s ecological civilization affect the health burden of urban and rural residents?

Accelerating the construction of ecological civilization and promoting the management of health environment problems is one of the core elements of the implementation of the“Beautiful China”and“Healthy China”strategies with Chinese characteristics in the new era.Based on the scientific connotation of ecological civilization,this paper systematically assesses the level of interprovincial ecological civilization construction in China using the combined CRITIC empowerment method and explores the impact of ecological civilization construction on the health burden of urban and rural residents using interprovincial panel data from 2003 to 2018 with the help of panel feasible generalized least squares,simultaneous equation estimation,and the extended regression model.It is found that there is a significant inverted U-shaped relationship between provincial ecological civilization construction and urban and rural residents’economic health burden,as well as a significant U-shaped relationship between ecological civilization construction and urban and rural residents’disease burden.Fiscal decentralization,urbanization,and industrialization are the three important indirect mechanisms through which ecological civilization affects the health burden of urban and rural residents,and fiscal decentralization plays a typical role in crowding out the health effect of ecological civilization.In the eastern and central regions,ecological civilization construction has effectively reduced the health burden of urban and rural residents,but it is more significant for improving the economic health burden of rural residents.While the“catching-up trend”of the progress of ecological civilization construction in the western region is obvious,ecological civilization plays an important role in alleviating the economic health burden of urban residents.After the robustness test,the conclusion still holds.This study provides an important empirical basis for local governments to improve the accuracy of their policies in promoting the“Beautiful China”and“Healthy China”strategies.

Strategies for Prioritizing Ecological Construction with Consideration of Agricultural Industry Development in Northern China’s Agro- pastoral Ecotone : A Perspective of Opportunity Cost

In northern China’s agro-pastoral ecotone,there are conflicts between agricultural industry and ecological construction resource competition,and also problems urgently to be solved for economic growth and sustainable ecological improvement.Taking the development concept of"lucid waters and lush mountains being mountains of gold and silver"as the guiding principle of prioritizing ecological and green development,this paper studied the strategies for prioritizing ecological construction with consideration of economic development of agricultural industry from the perspective of opportunity cost.Through the analysis of opportunity cost,externality,and Pareto optimal theory,and using the calculation method of the unit equivalent factor value of terrestrial ecological service function,this paper calculated the ecological service value of forest,grassland,and farmland.It found that the ecological value of forest and grassland per unit area was greater than the ecological value of agricultural industry.This indicates that the opportunity cost of farmland for ecological construction was less than that of agricultural industry.Based on the theoretical and quantitative analysis,it came up with recommendations for establishing a comprehensive system for prioritizing ecological construction with consideration of agricultural industry development and establishing and improving the incentive mechanism of ecological construction.

Selection of New Countryside Construction Model and Enlightenment for Ganlu Town, Zizhong County, Neijiang City

Basic conditions and new countryside construction of Ganlu Town, Zizhong County, Neijiang City were analyzed, SWOT adopted to analyze internal strengths, weaknesses, external opportunities and threats of its new countryside construction. On this basis, positive and practical strategies were put forward to promote the new countryside construction in the local area, and provide references for the new countryside construction in other regions.

Rural Infrastructure Construction in New Socialist Countryside Construction

In the background of new socialist countryside construction,rural infrastructure construction is favorable to consolidating fundamental position of agriculture,expanding rural job opportunities,increasing farmers' income,and favorable to development of rural economy and the national economy. Rural infrastructure construction mainly includes construction of agricultural basic production conditions,construction of rural ecological environment,construction of agricultural service system,and construction of rural living facilities. Finally,we put forward approaches and methods for strengthening rural infrastructure construction: firstly,increase fund input to provide financial support for rural infrastructure construction; second ly,make scientific village planning to ensure sustainability of rural infrastructure construction; thirdly,arouse farmers' enthusiasm and initiative to promote stable development of rural infrastructure construction.

STUDIES ON STEROIDAL PLANT GROWTH REGULATOR 24. STEREOCONTROLLED CONSTRUCTION OF THE SIDE CHAIN OF BRASSINOLIDE AND HOMOBRASSINOLIDE VIA A TANDEM VICINAL DIALKYLATION OF PYRANONE MOIETY

A stereocontrolled construction of the side chain of brassinclide and homobrassinolide has been achieved via the tandem vicinal dialkylation of the pyranone moiety as a key step.

Study on the Construction Path of Characteristic Small Cities and Towns from the Perspective of Supply-side Reform——Taking Zushan Town as an Example

Characteristic small cities and towns are the new vehicle for advancing new urbanization construction and supply-side reform.Zushan characteristic towns focus on tourism vacation,ecological livability,integration of production and cities,cultural heritage,poverty alleviation and other functions,and focus on building a new type of"product,city,and people"trinity,is a new benchmark for industrial transformation and upgrading.This article uses field surveys,interviews,and other methods to investigate the status quo of the construction of small towns with Zushan characteristics.Based on this,SWOT analysis of small towns is carried out,and the disadvantages and threats to its development are determined from the nature of towns and cities,infrastructure construction,and townships.Five suggestions were made for the construction of capital,the cultivation of special industries,and the detennination of the main body of urban construction.

Properties and Characteristics of Regolith-Based Materials for Extraterrestrial Construction

The construction of extraterrestrial bases has become a new goal in the active exploration of deep space.Among the construction techniques,in situ resource-based construction is one of the most promising because of its good sustainability and acceptable economic cost,triggering the development of various types of extraterrestrial construction materials.A comprehensive survey and comparison of materials from the perspective of performance was conducted to provide suggestions for material selection and optimization.Thirteen types of typical construction materials are discussed in terms of their reliability and applicability in extreme extraterrestrial environment.Mechanical,thermal and optical,and radiation-shielding properties are considered.The influencing factors and optimization methods for these properties are analyzed.From the perspective of material properties,the existing challenges lie in the comprehensive,long-term,and real characterization of regolith-based construction materials.Correspondingly,the suggested future directions include the application of high-throughput characterization methods,accelerated durability tests,and conducting extraterrestrial experiments.

A comprehensive review of lunar lava tube base construction and field research on a potential Earth test site

The Moon,as the closest celestial body to the Earth,plays a pivotal role in the progression of deep space exploration,and the establishment of research outposts on its surface represents a crucial step in this mission.Lunar lava tubes are special underground caves formed by volcanic eruptions and are considered as ideal natural shelters and scientific laboratories for lunar base construction.This paper begins with an in-depth overview of the geological origins,exploration history,and distribution locations of lunar lava tubes.Subsequently,it delves into the presentation of four distinctive advantages and typical concepts for constructing bases within lava tubes,summarizing the ground-based attempts made thus far in lunar lava tube base construction.Field studies conducted on a lava tube in Hainan revealed rock compositions similar to those found during the Apollo missions and clear lava tube structures,making it a promising analog site.Lastly,the challenges and opportunities encountered in the field of geotechnical engineering regarding the establishment of lunar lava tube bases are discussed,encompassing cave exploration technologies,in-situ testing methods,geomechanical properties under lunar extreme environments,base design and structural stability assessment,excavation and reinforcement techniques,and simulated Earth-based lava tube base.

Subsurface multi-physical characterization of mountain excavation and city construction in loess plateau with a fiber-optic sensing system

Mountain excavation and city construction(MECC)projects being launched in the Loess Plateau in China involve the creation of large-scale artificial land.Understanding the subsurface evolution characteristics of the artificial land is essential,yet challenging.Here,we use an improved fiber-optic monitoring system for its subsurface multi-physical characterization.The system enables us to gather spatiotemporal distribution of various parameters,including strata deformation,temperature,and moisture.Yan’an New District was selected as a case study to conduct refined in-situ monitoring through a 77 m-deep borehole and a 30 m-long trench.Findings reveal that the ground settlement involves both the deformation of the filling loess and the underlying intact loess.Notably,the filling loess exhibits a stronger creep capability compared to underlying intact loess.The deformation along the profile is unevenly distributed,with a positive correlation with soil moisture.Water accumulation has been observed at the interface between the filling loess and the underlying intact loess,leading to a significant deformation.Moreover,the temperature and moisture in the filling loess have reached a new equilibrium state,with their depths influenced by atmospheric conditions measuring at 31 m and 26 m,respectively.The refined investigation allows us to identify critical layers that matter the sustainable development of newly created urban areas,and provide improved insights into the evolution mechanisms of land creation.

Process,Material,and Regulatory Considerations for 3D Printed Medical Devices and Tissue Constructs

Three-dimensional(3D)printing is a highly automated platform that facilitates material deposition in a layer-by-layer approach to fabricate pre-defined 3D complex structures on demand.It is a highly promising technique for the fabrication of personalized medical devices or even patient-specific tissue constructs.Each type of 3D printing technique has its unique advantages and limitations,and the selection of a suitable 3D printing technique is highly dependent on its intended application.In this review paper,we present and highlight some of the critical processes(printing parameters,build orientation,build location,and support structures),material(batch-to-batch consistency,recycling,protein adsorption,biocompatibility,and degradation properties),and regulatory considerations(sterility and mechanical properties)for 3D printing of personalized medical devices.The goal of this review paper is to provide the readers with a good understanding of the various key considerations(process,material,and regulatory)in 3D printing,which are critical for the fabrication of improved patient-specific 3D printed medical devices and tissue constructs.