Water scaling predication for typical sandstone geothermal reservoirs in the Xi'an Depression

The Xi'an Depression in the Guanzhong Basin of western China has been suggested to contain geothermal resources that could aid China in achieving carbon neutrality and optimizing energy structure.However,the high concentration of total dissolved solids(TDS)and scale-forming ions in geothermal water from the depression causes severe scaling problems in harvesting geothermal energy.To reduce scale-related problems,accurate identification of scale types and prediction of scaling during geothermal energy utilization are crucial.This study starts with identifying the types and trends of scaling in the study area,using index-based discriminant methods and hydrogeochemical simulation to calculate and analyze the mineral saturation index of water samples from some wellheads and of reconstructed fluid samples of geothermal reservoirs.The results indicate that the scales are mostly calcium carbonate scales rather than sulfate scales as a result of temperature changes.Several portions of the geothermal water systems are found to have distinct mineral scaling components.Quartz and chalcedony are formed in low temperature areas,while carbonate minerals are in high temperature areas.Despite the low iron content of geothermal water samples from the study area,scaling is very common due to scaling-prone iron minerals.The findings can be used to evaluate geothermal drainage systems and guide anti-scaling during geothermal energy utilization in similar settings.

Evaluation of urban underground space resources using a negative list method: Taking Xi'an City as an example in China

Utilization of urban underground space has become a vital approach to alleviate the strain on urban land resources,and to optimize the structure and pattem of the city.It is also very important to improve the city environment,build livable city and increase the capacity of the city.Based on the analysis of existing evaluation methods and their problems,a method for evaluating underground space resources based on a negative list of adverse factors affecting underground space development is proposed,to be primarily used in urban planning stages.A list of the adverse factors is established,including limiting factors,constraining factors and influencing factors.Taking Xi'an as an example,using a geographical information system platform,a negative list of adverse factors for the underground space resources in Xi'an City are evaluated,and preventive measures are proposed.Natural resources,exploitable resources,and the potential growth of exploitable underground space resources are evaluated.Underground space assessment in the different development stages of the city,collaborative utilization and safety evaluation for multiple subsurface resources,environmental impact and assessment,as well as evaluation methods based on big data and intelligent optimization algorithms are all discussed with the aim of serving city planning and construction.

A Tentative Study on the Combination of Site Protection and City Construction of Xi'an

The protection of relic sites helps determine the culture coordinate of a city or a region,and enhances its cultural image and status.Through analyzing the construction features and technical means of various ruins parks in Xi'an including Daming Palace National Heritage Park,Qujiangchi Ruins Park,Hanyao Ruins Park,Dacien Temple Ruins Park,Tang Dynasty City Wall Ruins Park,Emperor Qin Ⅱ Mausoleum Ruins Park and so on,a new model combining the site protection with city construction is presented.By integrating cultural relics preservation,heritage protection with innovation,a series of ruins parks processed with deep cultural connotation are constructed,which not only protects the relics and refreshes the city construction,but also well reflects the essence of traditional Chinese culture unique charm of ancient oriental civilization.The well combination of site protection and city construction improves the cultural image and status of the city,enhances the charm of public cultural space,promotes the development of heritage protection and secures more funds for urban and rural construction.

Key Points in the Supervision of Road Landscaping Project——A Case Study of the South 3^(rd) Ring Road in Yanta District of Xi'an City,China

Characteristics of road landscaping were analyzed,as a kind of "linear" landscaping,it could be classified into urban street landscaping,urban ring road and expressway landscaping.Differences between road landscaping projects and other garden landscaping projects or construction projects were analyzed.Landscaping project for the South 3rd Ring Road of Xi'an City(in Yanta District)was taken for an example to summarize construction experience,discuss present conditions and features of garden landscaping supervision in China.The artistic and physiological properties of garden landscaping,as well as the supervision during maintenance period were stressed,but it was also pointed out that garden landscaping supervision in China was actually not given sufficient attention.On this basis,key points in the supervision of road landscaping project were proposed:understanding design ideas,selection of landscape plants,quality control of concealed works,prevention and control of diseases and insects,construction safety management and overall image;only by effectively implementing these key points,a high-quality road landscaping project could be realized to improve the image of a city and beautify its environment.

Dynamic Analysis of Coupling Relationship between Economic Development and Ecological Environment Based on Entropy Method——A Case Study of Xi'an City

[Objective] The aim was to study the coupling relationship between economic development and ecological environment. [Method] Firstly, the evaluation index system for the coupling system of economic development and ecological environment in Xi’an City was established, then the dynamic variation of coupling relationship between economic development and ecological environment in Xi’an City from 2001 to 2010 was analyzed by using entropy method, finally some corresponding suggestions were put forward according to the problems in the current development model. [Result] The economic development and ecological environment of Xi’an have made a significant upgrading and improvement from 2001 to 2010, namely showing a stable upward trend on the whole, and were in a well-coordinated development state in 2010. However, the development level of ecological environment obviously lagged behind economic development level. In addition, there were obvious differences in the development rate of sub-systems, that is, economic efficiency and economic level developed rapidly, while the carrying capacity of ecological environment and economic vitality grew slowly and unstably. [Conclusion] The research could provide theoretical bases for the establishment of strategies for the coordinated development economy and environment in Xi’an City.

Research center of biomanufacturing in Xi'an Jiaotong University

Xi'an Jiaotong University (XJTU)has carded out the research of additive manufacturing (AM)since 1993,who is one of the earliest institutes majoring in AM.After 20years of effort,XJTU has made great progress on the additive manufacturing of polymer,metals,ceramics,composite materials and intelligent materials.XJTU has established a research team that features the engineering application of rapid manufacturing system.

Protection of Historic and Cultural Heritage in the Urban Renewal of Xi'an City,China

Concept of urban renewal was elaborated,which for the protection of historic and cultural heritage not only provides a favorable opportunity of integrating neighboring environment and improving protection conditions,but also imposes threats such as destroying its historic images and patterns,degrading of survival environment.To properly protect historic and cultural heritage in the unceasing urban renewal,and make it a significant resource and feature of the city but not a barrier of urban development,empirical analysis and theoretical research were adopted to analyze and study current conditions and problems of the protection of historic and cultural heritage in Xi'an City from the dimension of urban renewal concept and present urban renewal of Xi'an.Moreover,through summarizing successful experience of other regions,specific strategies were given to protect historic and cultural heritage of Xi'an City in its urban renewal more scientifically and reasonably.

Effects of urban grass coverage on rainfall-induced runoff in Xi'an loess region in China

In this study, laboratory rainfall simulation experiments were conducted to investigate the regulatory effects of grass coverage on rainfallrunoff processes. A total of 80 grass blocks planted with well-grown manilagrass, together with their root systems, were sampled from an eastern suburban area of Xi'an City in the northwest arid area of China and sent to a laboratory for rainfall simulation experiments. The runoff and infiltration processes of a slope with different grass coverage ratios and vegetation patterns were analyzed. The results show that the runoff coefficient decreases with the increase of the grass coverage ratio, and the influence of grass coverage on the reduction of runoff shows a high degree of spatial variation. At a constant grass coverage ratio, as the area of grass coverage moves downward, the runoff coefficient, total runoff,and flood peak discharge gradually decrease, and the flood peak occurs later. With the increase of the grass coverage ratio, the flood peak discharge gradually decreases, and the flood peak occurs later as well. In conclusion, a high grass coverage ratio with the area of grass coverage located at the lower part of the slope will lead to satisfactory regulatory effects on rainfall-induced runoff.

Study on Present Situation of Plant Landscape Construction for Xi'an Urban Roads

According to the primary study on green plant species and arrangement of Xi'an urban road,the major problems about plant construction in Xi'an urban roads were analyzed in this study,and the greening plant arrangement in Xi'an urban road was discussed to provide references for Xi'an urban road greening.An analysis of the road in Xi'an plant problems and plant configuration for the road less than the existence of specific proposals for Xi'an Green has been building the road from.

Discussion of Design Concepts of the Peach Blossom Lake Waterfront Park on the Chan River of Xi'an City

The construction of Peach Blossom Lake Waterfront Park on the Chan River in Xi'an City gives tourists and Xi'an citizens a waterfront park.By participating the field investigation,feasibility study,demonstration of design scheme as well as extended preliminary design and construction drawing design of the project,the author studied the "maintenance" and "innovation" in constructing modern urban waterfront parks by combining landscape design knowledge and practices,that is to say,how to inherit Chinese traditional culture and gardening art while making innovations,and achieve the organic integration of traditional cultural elements and modern functional elements.

Study on Ground Fissures and Land Subsidence Induced by Seepage Deformation in Xi'an

There are lots of theories about the causation of ground fissures in Xi’an,such as the tectonics theory,the excessive groundwater exploitation theory and the compositive theory. Based on the construction of the geologic environment monitoring network in Guanzhong urban agglomeration,the latest survey of ground fissures and land subsidence in Yuhuazhai in Xi’an shows that the extensive piping and quicksand in self-supply wells is a factor to induce ground fissures and land subsidence. It is suggested that the seepage deformation caused by high hydraulic gradient leads to sand gushing and changes some aquifers into the composite aquifer,which is the main factor to induce ground fissures and land subsidence. The development characteristics of ground fissures and land subsidence caused by seepage deformation were summarized. The results will supply new schemes and methods for the causation of land subsidence and ground fissures in Xi’an and lay out a clear road map of measures to control land subsidence and ground fissures.

Climate Characteristics of High Temperature Weather in Xi'an City in Recent 59 Years

[Objective] The aim was to study the characteristics of high temperature in Xi’an City over the last 59 years. [Method] By dint of daily highest temperature in the Xi’an observatory, the climate characteristics of high temperature at different intensities and the high attitude circulation were studied by statistical method. [Result] Over the last 59 years, there were 22.95 high temperature days each year on average in Xi’an City, which occurred from the last ten days of April to the first ten days of September. Most high temperature days occurred in the last ten days of July, followed by that in the last ten days of June. There were two peak values in the last ten days of June and last ten days of July when temperature ≥38.0 ℃. For the hottest day, it occurred most in the last twenty days of June, followed by July, and rarely in August. The interannual changes in the high temperature day, hot day and hottest day showed one-little and one-much trend. It was much from 1950s to 1960s, from 1970s to 1980s and then grew more after 1990s. The annual extreme highest temperature took place in the last twenty days of June, and then in the last ten days of July. Its interannual changes showed high-low-high trend. The high temperature appeared most often in July and also lasted for the longest duration. The hot day lasted for two days. The hottest days of ≥40.0 ℃ were very rare. The circulation of high temperature generally fell into one of four categories: continental high pressure controlling type, subtropical high controlling type, strip high pressure controlling type and northwest airstream controlling type. [Conclusion] The study provided references for the forecast and pre-warning of high temperature.

Research on Spatial Development of Xi'an Modern Urban Industrialization

As the Westernization Movement developing in the 1860 s, China began to introduce and learn western science and technology to develop modern military industry and civilian industry. In modern history, Xi'an went through the Xi 'an capital's industrial embryonic form in the late Qing dynasty and urban industrialization construction during the period of the Republic of China so that it converted gradually from a trade city for Chinese traditional handicrafts under the background of the feudal society to a city in the industrial society where machine were used for production.

Space Structuring of the Northern Foot of the Qinling Mountains(Xi'an Section) based on Landscape City

Northern foot of the Qinling Mountains(Xi'an Section) is a transitional section between the Qinling Mountains and Xi'an City, so it has great ecological signifi cance. On the basis of sorting out landscape city, space structuring of the northern foot of the Qinling Mountains was studied within the theoretical framework of landscape city, it was disclosed that northern foot of the Qinling Mountains was a signifi cant ecological screen for the landscape city spatial pattern of Xi'an, and an important carrier for its "mountain, water and city" cultures. Then, fi ve infl uence factors for the space structuring of the study area were given, and basic contents of the space structuring analyzed from fi ve perspectives of spatial structure, spatial form, ecological environment, integration of regional spaces, historical and cultural context, so as to explore ecological conservation and moderate utilization of the northern foot of the Qinling Mountains from the perspective of space structuring.

Construction of Xi'an ecological old-age care community in the new urbanization

The new urbanization is an important carrier of ecological civilization construction, and ecological old-age care is the concrete manifestation of the perfect combination of the two, the proper meaning of the new urbanization connotation and an inevitable trend of its development. Based on the analysis of the connotation and relationship between the new urbanization and ecological old-age care, together with the current situation and existing problems of the current nursing institutions and ecological old-age care in Xi'an area, this paper discusses the major issues that should be noticed when constructing the ecological old-age care community in Xi'an and three main construction modes.

意义体验下的西安红色革命文化互动装置设计研究

体验经济时代下,通过文化意义体验创新,使受众在与互动装置互动过程获得情感以及精神层面的意义体验,从而增加文化的认同感。文章分析了文化互动装置与体验设计相关理论以及现状,结合“文化三层次”理论、符号学相关理论,探索了基于意义体验的文化互动装置设计转化方法。通过具体设计实践验证该方法的有效性。基于意义体验的西安红色革命文化互动装置设计研究是以体验设计以及符号学视角来实现文化传播与传承的桥梁,通过文化内涵的挖掘与创意设计转译,为西安红色革命文化的传承提供了新的方向。

机动车限行对西安市空气质量的影响及其模型分析

近年来,空气污染已成为限制西安城市人居环境质量提升的重要因素之一。当地政府采取了一系列的措施进行空气污染治理,其中机动车限行政策以其可实施性强、公共投入较少、简单易行等特点而最受青睐。在分析2016―2020年间西安市空气质量变化趋势的基础上,运用R语言针对相关影响因子(限行政策、平均风速、相对湿度和平均温度)与空气质量之间的关系建立了广义相加模型,并进行了拟合分析和相关性检验,结果表明机动车限行政策与西安市空气质量改善具有较明显的相关性。

银西高铁黄土含水层隧道群井降水模拟研究

研究目的:银西高铁上阁村隧道穿越董志塬黄土含水层施工中出现的渗涌水,受地下水渗流影响,引起了洞身黄土含水率增加、围岩自稳性变差等问题。为解决上阁村富水黄土隧道施工难题,论文首先分析了上阁村隧道黄土含水层分布特征,其次介绍了地表降水施工辅助措施及其效果,最后应用MIDAS/GTS建立隧道工程群井降水模型,实现了不同流量以及渗透系数工况下的隧道开挖渗流模拟计算。研究结论:(1)上阁村隧道长大段落通过软塑黄土含水层,通过地表降水梳干隧道洞身范围内地下水,提高了隧道洞身黄土围岩稳定性,确保了隧道施工的安全和进度;(2)不同单井流量(80 m^(3)/d、90 m^(3)/d、100 m^(3)/d)的群井数值模拟结果表明,地下水位降深在短时间内达到了设计要求,验证了降水设计参数及效果;(3)本研究可为黄土等低渗透岩体富水隧道工程施工处置及设计提供依据。

迈瑞BC-6800 Plus血小板相关参数参考区间的建立及验证

目的建立并验证西安地区血小板相关参数血小板计数(PLT)、血小板体积分布宽度标准差(PDW-SD)、平均血小板体积(MPV)、血小板压积(PCT)、大血小板比率(P-LCR)、大血小板数量(P-LCC)、血小板体积分布宽度(PDW)的参考区间。方法选择2022年8月至2023年8月在西安交通大学第一附属医院主院区和东院区5153名健康体检成年人群,采用迈瑞Mindray BC-6800 Plus血细胞分析仪检测外周血液,依据《临床实验室如何确定和建立生物参考区间;批准指南》CLSL C28-A3,以非参数法建立PLT、PDW-SD、MPV、PCT、P-LCR、P-LCC、PDW的参考区间。结果健康成年人群男、女不同性别间的PLT、MPV、PCT、P-LCR、P-LCC、PDW比较差异均具有统计学意义(P<0.05),但PDW-SD比较差异无统计学意义(P>0.05);各年龄段PLT、PCT、P-LCC、PDW间比较差异均具有统计学意义(P<0.05),但MPV、PDW-SD、P-LCR各年龄段间比较差异均无统计学意义(P>0.05)。标准正态离差检验方法显示无需按照性别、年龄段分组建立参考区间。PLT、MPV、PCT、PDW-SD、P-LCR、P-LCC、PDW的参考区间分别为(148~324)×10^(9)/L、8.4~12.5 fL、0.159%~0.322%、8.8~17.5 fL、15.1%~43.6%、(35~96)×10^(9)/L、15.1~16.8。结论建立并验证西安地区血小板相关参数参考区间,合理选用PDW-SD对异常血小板的识别,对血小板参数的自动审核提供必要的数据支持。

基于耦合协调模型的人水和谐度评价

为了合理地定量评价人水关系,以西安市为例,在人水和谐概念的基础上,构建人水和谐评价指标体系,通过改进G1赋权法计算各指标权重;以水系统和人文系统综合发展水平为基础,采用耦合协调模型计算人水系统协调度,并通过障碍度模型识别人水系统协调发展障碍因素;采用单指标量化—多指标综合—多准则集成评价方法,先计算出水系统健康度和人文系统发展度,再与人水系统协调度集成,最终得到西安市2012—2021年人水和谐评价结果。结果表明:西安市人水协调度逐渐提高,各年份各指标对人水系统协调发展的阻碍程度清晰可见,人水和谐从较不和谐提升至和谐等级;该方法评价结果与实际相符,具有良好适用性,障碍因素的识别对人水关系进一步和谐有一定启发性。