最新刊期
期 4 ， 2023
- 摘要：In the context of ecological civilization construction strategy, traditional villages, as essential carriers of material and immaterial resources for thousands of years, are the cornerstone of conventional culture protection and ecological wisdom inheritance. Based on integrating the existing ecological civilization index system, we connect different national departments, provinces and municipalities with relevant policies and plans, and establish a national scale basic database of ecological civilization construction indexes. The four quasi-levels of the natural environment, social development, ecological zoning and ecosystem are used to build an index system for evaluating the value of traditional village protection and utilization that matches the ecological civilization construction strategy. Using AHP and EWM method, traditional villages are classified into five classes, then analyzing and summarizing the different characteristics and formation mechanism of the five levels of traditional villages, and putting forward the corresponding construction strategies. The study shows that this evaluation system can comprehensively assess the current situation of protection and utilization of different types of traditional villages, which is important to implement the strategic deployment of national ecological civilization, ensuring ecological security, optimizing the protection path of traditional villages, and promoting the sustainable protection and development of traditional villages.关键词：construction of ecological civilization;traditional villages;protection and utilization;value evaluation system
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发布时间：2023-07-24 - 摘要：Taking Weinan City, Shaanxi Province as an example, guided by the theory of " Factor Flow" and " Strength of Weak Ties" in urban-rural relations, supported by the enterprise headquarters-branch and structural hole model, this study compares the overall characteristics and patterns of the networked development of urban-rural relations in Weinan City from 2010 to 2020, and summarizes the different types and patterns of urban-rural relations under the influence of enterprise affiliated network. The aim is to provide paths and suggestions for achieving future urban-rural integration development and rural revitalization in Weinan City. The results indicate that: ① Under the influence of economic activities of urban and rural enterprises, the urban-rural relationship in Weinan City has shown a certain trend of network development, and the network scale is constantly expanding; ② The number of structural holes between urban and rural network subgroups is constantly decreasing, and the number of nodes contained in the maximum network subgroup is gradually increasing. The scope of urban-rural integration is wider, but the position of the central urban area of Weinan as the core node controlling all structural holes between network subgroups has not changed; ③ By comparing and analyzing the control ability of all network nodes over structural holes in the network from two aspects of effective network scale and network constraint, the urban-rural relationship in Weinan City is summarized into three types: mature, developmental, and start-up urban-rural network relationships.关键词：urban-rural relationship;enterprise affiliated network;enterprise headquarters-branch model;structure hole model;Weinan City
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发布时间：2023-07-24 - 摘要：In the 60s and 70s of the 20th century, China selected parts of the central and western regions to carry out Third-line construction for nearly 20 years, which rapidly improved the public infrastructure services and living standards of the villages where they were located. However, with the arrival of the end of construction, the geographical environment of the Third-line factory can not meet the development needs, and the enterprises are gradually moved out, resulting in different degrees of abandonment of factory buildings, ecological pollution, and separation of urban areas and rural development, becoming the core factors restricting the development of village industries and rural revitalization. Based on the systematic deconstruction of Third-line industrial wasteland, this study deeply analyzes the logical mechanism between the redevelopment of Third-line industrial wasteland and village industrial revitalization, that is, the specific industrial revitalization goal of ecological industrialization, improvement of industrial chain, and revitalization of industrial vitality is achieved through the specific measures of village ecological restoration, land-use function re-endowment, and humanistic spirit mining. On this basis, it takes Xiayishui Village, Hanzhong City, Shaanxi Province as the research object, analyzes and summarizes the existing problems in its industrial development, and proposes that the essence of the redevelopment of Third-line industrial wasteland is to realize capital reconstruction and asset reconstruction through the restructuring of residual material resources and the revitalization of humanistic spirit, so as to realize industrial transformation optimization, industrial emerging formats and industrial structure upgrading, and summarize that through handling legacy disputes, enriching industrial types, improving spatial layout, implementing pollution control, and inheriting spiritual connotation and other specific measures finally achieve the development path of clear land rights and responsibilities, integrated development of three industries, homogenization of infrastructure, industrialization of ecological resources, and injection of new industrial vitality, and provide a certain reference for the development of village industries facing the same dilemma.关键词：industrial wasteland;redevelopment;industrial revitalization;Third-line construction
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发布时间：2023-07-24 - 摘要：Promoting the overall cognition of vernacular culture is an important measure to repair the genes of cultural space and implement rural revitalization in China. In view of this, taking the directory data representing vernacular culture as the research object, the methods such as mathematical statistics, spatial analysis, geographic detector (GD) and geographic weighted regression (GWR) were comprehensively used to quantitatively explore the spatial distribution pattern and influencing factors of vernacular culture.The results show that: ① vernacular culture presents a clustering distribution pattern at the national scale, and the interprovincial distribution is unbalanced; ② The spatial distribution of culture shows a " core-edge" characteristic bounded by Hu Huanyong Line, and the core area clusters in the Yangtze River and Yellow River basins and the eastern coastal area; ③ The economic and social factors explain much more than the natural factors for the spatial differentiation of vernacular culture, and people's subjective initiatives are the dominant force for the development of vernacular culture; ④ Complex coupling effect of various factors result in the spatial differentiation of vernacular culture, and the interaction between economic and social factors is the strongest; ⑤ The GWR model constructed by the five factors with the best effects could explain 34.9% of the spatial differentiation characteristics of vernacular, and the intensity and direction of different factors are significantly different in terms of spatial effects.关键词：vernacular culture;distribution characteristics;influencing factor;geographic detector;geographically weighted regression
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发布时间：2023-07-24 - 摘要：Based on the data of population, cultivated land and grain yield in Shaanxi Province from 1949 to 2018, taking the relationship between human and grain as the main line, this paper constructs the cultivated land pressure analysis model and the evaluation model of land resource carrying capacity, systematically studies the structural characteristics of cultivated land, the change of grain production and the coordinated change of population distribution in Shaanxi Province in recent 70 years from the two dimensions of space and time, and studies the temporal and spatial evolution pattern of land resource carrying capacity. The results showed that: ① during the research period of recent 70 years, the cultivated land area showed a decreasing trend, accounting for 31.52% of the cultivated land area in 1949. In the recent 20 years, the number of cultivated land was stable at the level of 293.33×104hm2, the fluctuation of cultivated land pressure was gradually stable, the grain crop ratio was gradually reduced, and the per capita cultivated land area was 0.078 hm2, which was lower than the national average of 0.098 hm2; ② The carrying capacity of land resources presents three fluctuation cycles: growth period from 1949 to 1998, recovery period from 1999 to 2011 and stable period from 2012 to 2018; ③ From the analysis of spatial pattern, the overload degree of human food relationship in Xi'an, Ankang, Shangluo and other cities gradually intensifies with time, Baoji and Xianyang are in a tight equilibrium state of critical overload, and the human food relationship in Yulin and Weinan is developing well. Generally speaking, the overall development trend of land resources carrying capacity in Shaanxi Province is good, and the land resources carrying capacity shows an overall growth trend. The adjustment of population, agricultural production level and planting structure leads to the fluctuation of carrying level, but the land production and carrying capacity are not weakened.关键词：land use;cultivated land pressure;carrying capacity of land resources;human food relationship;spatial-temporal pattern;Shaanxi Province
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发布时间：2023-07-24 - 摘要：The flow pattern recognition technology based on capacitive tomography (ECT) system is widely used in dynamic measurement of various industrial processes due to its non-invasive and visual advantages. To improve the flow pattern identification accuracy of ECT system, recognition algorithm based on neural network model is widely used. But the ECT system can't get a lot of ECT system measured samples, resulting in low accuracy, low model generalization. To solve this problem, this paper adopted the dataset amplification method based on deep convolution generative adversarial network (DCGAN), and used the images reconstructed by the preprocessed LSSVM method to build a flow pattern image generation model based on DCGAN for experiments. Gan-train and GAN-test were used to evaluate the generated images. After that, the amplified dataset is used for flow pattern identification based on YOLOv3. The experimental results show that the DCGAN method can effectively amplify the original data set and generate images with high accuracy and richness. Together with the target detection algorithm of YOLOv3, the flow pattern recognition accuracy of ECT system can be improved to a great extent.关键词：flow pattern identification;data set amplification;machine learning;deep convolution generative adversarial network;YOLOv3
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发布时间：2023-07-24 - 摘要：Non-contact electrical impedance tomography (NEIT), as a new type of test and measurement technology, has the advantages of no radiation, non-contact and fast response. The image reconstruction part of traditional electrical tomography technology is usually performed off-line imaging on the MATLAB software platform, which is not conducive to real-time monitoring in industrial sites. Aiming at the above problems, this paper will design a LabVIEW-based electrical impedance tomography system, which can realize online data acquisition and real-time imaging. Through the impedance measurement system, the real part, imaginary part and phase component of impedance information are extracted. Combined with the image reconstruction algorithm compiled by LabVIEW, these three kinds of component information are imaged respectively. To improve the reconstruction accuracy, the image fusion algorithm based on principal component analysis is adopted to fuse image of real, imaginary, and phase imaging results. By the verification of the built two-phase flow test platform, the system can be effectively used for two-phase flow tomography under different media distributions.关键词：non-contact electrical impedance tomography(NEIT);LabVIEW;two-phase flow;image fusion
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发布时间：2023-07-24 - 摘要：The image reconstructed by ECT image reconstruction algorithm has the problems of unclear edge and low imaging accuracy. It is easy to misjudge the interface of different mediums, and the accuracy of cross-section water content calculation depends on the accuracy of binary segmentation of the reconstructed image. Therefore, by analyzing the shortcomings of the global threshold segmentation algorithm, we propose a local threshold segmentation algorithm combined with simulated annealing algorithm. In order to verify the effectiveness, the reconstructed images of laminar flow, central flow, annular flow are segmented by local optimal threshold, and the cross-section water content is calculated. By comparing with the global threshold segmentation algorithm, it is proved that the local threshold segmentation algorithm has a relatively higher accuracy in calculating the section water content. In addition, considering the nonlinear error of ECT system, an image threshold segmentation algorithm considering the nonlinear error of ECT is adopted by combining with the local threshold segmentation algorithm. Comparing the global threshold segmentation algorithm and local threshold segmentation algorithm without considering nonlinear error, shows that the local threshold segmentation algorithm considering ECT nonlinear error has a relatively higher accuracy in the calculation of cross-section water content.关键词：electrical capacitance tomography;cross-section water content;local threshold segmentation;ECT nonlinear error;optimal algorithm
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发布时间：2023-07-24 - 摘要：For a long time, China's energy structure has been dominated by coal-fired power generation. The smoke and dust generated by coal-fired power generation are the main atmospheric particulate pollutants, causing serious harm to the environment and human health. It is very important to monitor the speed of soot emission accurately to prevent environmental pollution effectively. In view of the advantages of electrostatic sensor with high sensitivity, not affected by flue dust accumulation, simple structure and low cost, this paper adopts probe electrostatic sensor to measure dust flow parameters in power plant flue. By acquiring the electrostatic signal which contains rich information of two-phase flow, the dust flow velocity is monitored by the spatial filtering method based on Hilbert-Huang transform. Through constructing pneumatic conveying experiment platform measuring system, the static characteristic of flow velocity is tested. The experimental results show that the electrostatic method used to detect the smoke velocity data has higher reliability, measurement error is smaller, the smoke velocity detection technology has significant improvement.关键词：soot velocity detection;probe type electrostatic sensor;electrostatic method;spatial filtering method;Hilbert-Huang transform
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发布时间：2023-07-24 - 摘要：The wastewater discharged from the sewage treatment plant has a greater impact on the river microbial community. In order to understand the degree of its influence and the response of microbial communities to environmental factors, 16S rRNA technology, bioinformatics analysis and statistical analysis were used to analyze the evolution characteristics of microbial communities in the sediments of the Taiping River and the response law on the wastewater from the sixth and seventh sewage treatment plants in Xi'an. The study found that the abundance of the microbial community gradually increased with the increase of the distance from the drainage outlet. Cyanobacteria was the biomarker in the microbial community of the Taiping River, and α-proteobacteria (alphaproteobacteria) was a key species for the community function of the Taiping River. Microbial community had the most significant response to dissolved oxygen (DO), temperature and salinity. The change of microbial community structure in the sediments of receiving rivers can reflect the impact of wastewater discharged from sewage treatment plants on river water quality, and then characterize the health of river ecosystem.关键词：16S rRNA;microbial community;sediment;sewage treatment plants;environmental factors;Taiping River
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发布时间：2023-07-24 - 摘要：Bacillus megaterium LM-44, a deep-sea salt-tolerant bacterium, was used as a microbial adsorbent for the adsorption of the azo dye methylene blue (MB). The inorganic carrier silica gel and organic carrier macroporous resin were used to immobilize it. The reaction conditions of the adsorbent were optimized by the single-factor method, and the optimum reaction conditions for the free strain were the adsorbent concentration of 1.187 mg/mL, the solution pH of 9, the temperature of 25 ℃, 150 r/min, and the removal rate of MB solution of 100 mg/L by shaking reaction for 60 min was 70%, and the adsorption capacity was 153 mg/g when the MB concentration increased to 500 mg/L. The optimum reaction conditions for silica gel immobilized adsorbent were 2 g/L adsorbent concentration, solution pH of 9, temperature 25 ℃, 150 r/min, shaking reaction for 120 min to remove 98% of 100 mg/L MB solution, adsorption capacity of 49 mg/g, adsorption capacity of 500 mg/L MB solution, adsorption capacity of 192 mg/g. The optimum reaction conditions for the immobilized adsorbent of macroporous resin were 8 g/L adsorbent concentration, solution pH of 9, temperature 25 ℃, 150r/min, and 180 min of shaking reaction with 82% removal rate and 10 mg/g adsorption capacity for 100 mg/L MB solution, and 32 mg/g adsorption capacity for 500 mg/L MB solution. Bacillus megaterium LM-44 had a higher adsorption capacity than the previously identified decolorizing bacterium Bacillus sp. LM-24 and still had a better removal of high concentration wastewater. The adsorption process was studied using Langmuir and Freundlich adsorption isotherm models with kinetic functions, and the results showed that all three adsorbents fit better with quasi-level kinetics, and the adsorption of free strains fit better with Freundlich model, while immobilized adsorbents fit better with Langmuir.关键词：deep-sea bacillus megaterium;microbial adsorption;methylene blue;high adsorption capacity
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发布时间：2023-07-24 - 摘要：In order to study the effective removal method of residual penicillin antibiotics in water, amoxicillin (AMX) was taken as the research object. Firstly, the adsorption effect of different resins on AMX under acidic conditions was investigated, and the best resin was selected. Then, the best resin with sulfonic acid/phosphoric acid bifunctional MTS9570 was used as the adsorbent to further study its adsorption behavior of AMX. The adsorption kinetics studies show that the pseudo-second-order and intra-particle diffusion models can better describe the adsorption process of AMX on MTS9570, indicating that the adsorption process of AMX on MTS9570 is controlled by chemisorption and intra-particle diffusion, and the optimal adsorption capacity is 99.28 mg/g. According to the adsorption isotherm, Langmuir isotherm has the highest fitness, indicating that there is a single layer adsorption mechanism on the surface of MTS9570 adsorbent. Thermodynamic parameter ΔH<0, ΔS>0 and ΔG <0, indicating that the adsorption at the solid-liquid interface is a spontaneous exothermic process with increased randomness. Combined with the above results and the structural properties of adsorbent and adsorbates, it is speculated that the adsorption of AMX by MTS9570 may be mainly controlled by electrostatic interaction and hydrogen bonding. After six sorption-desorption cycles, the adsorption capacity of MTS9570 can still reach 77.99% of the initial adsorption capacity, indicating that the adsorbent has good reusability.关键词：cation exchange resin;sulfonic-phosphoric bifunctional group;amoxicillin;adsorption behavior
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发布时间：2023-07-24 - 摘要：To explore the tumor mutation characteristics of patients with non-small cell lung cancer at different lesion locations in the lung and the underlying molecular mechanisms leading to differences in clinical manifestations. High-throughput sequencing was performed on fresh tumor tissue samples from 62 lung cancer patients admitted to our hospital, and the sequencing data of 502 non-small cell lung cancers in the TCGA database were collected, and the characteristics and functional characteristics of gene mutation were analyzed from the perspectives of different lung lobes and distribution sides. Mutations were detected in 99.1% (559/564) of the samples. The proportion of samples with two mutations detected in different groups is the highest(63.01%~82.93%). There were significant differences in the types and frequencies of mutated genes and loci among the groups, but there was no correlation between them and clinical characteristics (age, gender). The functional prediction results show that the non-shared genes between different lung lobe groups are mainly related to the regulation of carbon metabolism, drug resistance in the cancer center, while the non-shared genes between the left and right lung cancer groups are mainly related to the regulation of PD-L1 expression, cell proliferation, mismatch repair and apoptosis signaling pathway, etc. There are significant differences in tissue mutation characteristics and biological function changes in lung cancer patients with different primary sites, which is of great significance for the study of the pathogenesis of non-small cell lung cancer and the auxiliary clinical diagnosis of the primary tumor.关键词：primary site;mutations;gene function;high-throughput sequencing;non-small cell lung cancer
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发布时间：2023-07-24 -
ASS1 expression and its correlation with clinicopathological features and prognosis in breast cancer
摘要：To determine the key molecule in breast cancer pathology and clinical prognosis by data analysis as well as surgical specimens immunohistochemical staining analysis. TCGA and GTEx databases were used to screen key molecules in the urea cycle with differential expression in breast, and their relationship with the prognosis of breast cancer patients was also analyzed. Then, the surgical specimens of 97 breast cancer patients and 54 non-neoplastic (mammary gland disease) patients who underwent surgical treatment in Xijing Hospital from November 2010 to December 2016 were collected to produce breast cancer tissue chips. Immunohistochemical staining was employed to determine the expression of ASS1 (argininosuccinate synthase 1) in breast cancer and adjacent normal tissues, and to verify its relationship with pathological features and prognosis of breast cancer. TCGA and GTEx database analysis showed that the expression of ASS1 decreased in breast cancer, significantly correlated with the prognosis of patients (p<0.05). Immunohistochemical results demonstrated that ASS1 is mainly located in cytoplasm. Its expression decreased in breast cancer, and significantly correlated with Ki-67 level and molecular typing (p=0.021 5, p=0.000 5). The expression of ASS1 significantly decreased in breast cancer, and closely related to molecular typing and Ki-67 level, suggesting that ASS1 plays an important role in the occurrence and development of tumor. Therefore, low ASS1 expression can be used as a potential indicator to evaluate the prognosis of breast cancer.关键词：urea cycle;argininosuccinate synthase 1 (ASS1);breast cancer;prognosis- 1
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发布时间：2023-07-24 - 摘要：A number of small uranium deposits, occurrences and anomalies have been discovered in the exploration of the Junggar Basin, two-thirds of which are located in the southern edge of the basin. But no uranium deposits of medium size or above have been found, and no fundamental breakthrough in mineral search has been achieved. In order to understand the deposition and distribution pattern of sandstone type uranium ore in the southern margin of Junggar Basin, objectively evaluate the mineralization potential and uranium metallogenic prospect, guided by stratigraphic stratigraphy, sedimentology and hydrogenic uranium ore theory, after analyzing the data from field research drilling and logging, and analyzing various strata in the southern margin of the basin, we focused on the Middle Jurassic Toutunhe Formation (J2t) in the Liuhuanggou area, and established the isochronous stratigraphic bridge of the Toutunhe Formation in this area. Then, we analyzed the material source direction, sand body thickness, sedimentary environment and depositional system of the Toutunhe Formation during the depositional period. Finally, the spatial spreading and the development characteristics of the main sand body of the Tutunhe Formation have been clarified.Combined with the distribution of known uranium mineralization and the geochemical properties of the petrographic phases of the Tourtunhe Formation, it is concluded that the Tourtunhe Formation can be subdivided into the lower sub-section (J2t1-1), the upper sub-section (J2t1-2) of the lower section, the lower sub-section (J2t2-1) and the upper sub-section (J2t2-2) of the upper section in the Liuhuanggou area, which is a braided river-quadrangular river sedimentary system from the bottom up. The large braided river sand body in J2t1-1 is the most favorable mineralization formation. And J2t2-1is also a potential prospective formation.Secondly, the sand body spreads along the NWW direction and gradually thins toward NE, which is consistent with the trend of the main mineralization, and the material source is mainly from the southwest of the area. Thirdly, the uranium mineralization is obviously influenced by the late basin modification and the oil and gas action, with moderate stripping. Further, it is controlled by the two flanks of the back-sloping tectonic core stratigraphy of the neotectonic fold zone. Therefore, it is believed that the Toutunhe Formation in the Liuhuanggou area has favorable conditions and potential for ore-forming and search of sandstone-type uranium.关键词：sandstone-type uranium deposit;southern margin of Junggar Basin;Toutunhe Formation;metallogenic prospects;sedimentation;Liuhuanggou Area
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发布时间：2023-07-24 - 摘要：In this paper, a total of 42 sites from the Early Cambrian Shiyantou Formation, Yulingshan Formation and Hongjingshao Formation were collected in Zhujiaqing section and Guliancun section for the study of rock magnetism and anisotropy of magnetic susceptibility. The experimental results show that the magnetic minerals in the samples include magnetite, hematite and a small amount of goethite, while paramagneticminerals are the main contributors to the AMS. In both sections, the magnetic foliation is relatively developed and the degree of anisotropy is low, showing typical sedimentary characteristics. However, considered the relationship between bedding strike and the distribution of AMS ellipsoid principal axis, the AMS results of Zhujiaqing section reflect the initial deformation fabrics under the late compressive stress near E-W direction, while the AMS results of Guliancun section retain the primary imbricated sedimentary fabrics, including flow fabrics and transverse fabrics. Through further analysis of shape factor (q) and imbricated angle (β) of samples in Guliancun section, it is found that during several million years of deposition from Yuanshan to Hongjingshao Formation, the hydrodynamic conditions gradually increased, and the paleocurrentic direction was SW-NE without significant change, and the sedimentary source area may be the Kangdian old land to the west.关键词：Eastern Yunnan area;Cambrian Stage 3;Rock Magnetism;magnetic fabric;paleocurrent direction
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发布时间：2023-07-24
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