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In order to ensure the subsequent stability of the composite repaired structure, it is required to use nonlinear ultrasonic Lamb wave to detect the health of the repaired area. Experimental and simulation studies of tensile damage in composite plate before and after adhesively-bonded repaired composite plates were conducted using nonlinear ultrasonic Lamb wave higher harmonic response technique. Finite element modeling was performed by ABAQUS software, the Hashin criterion was used to predict the tensile damage evolution of the matrix, and a smoothing analysis step was introduced in the tensile process. Finally, the propagation process of Lamb wave was simulated by applying displacement loads. On the basis of experimental verification of the feasibility of the simulation model, the relationship between higher harmonic response of nonlinear Lamb wave and tensile displacement, as well as the influence of different tensile damage degrees on the nonlinear parameters were investigated. The results show that compared with the unrepaired structure, the damage area, the second and third nonlinearity parameters in the adhesively-bonded repaired structure after stretching are significantly reduced. It indicates that this method can evaluate the effectiveness of engineering adhesively-bonded repair. With the increase of the tensile displacement, the second and third harmonic amplitudes and nonlinearity parameters first increase and then decrease, and reach the maximum at the tensile displacement of 1 mm. The nonlinear Lamb wave high order harmonic technology can effectively predict the tensile damage of composite before and after repair. [ABSTRACT FROM AUTHOR]

To determine the reasonable stope structural parameters for the sublevel drilling stage open stope and subsequent filling mining method in Hongling Lead Zinc Mine, numerical simulation was employed to study 16 different scenarios with roof thicknesses of 3 m, 5 m, 7 m, and 10 m, and stope lengths of 20 m, 30 m, 40 m, and 60 m, respectively. The stress, displacement, and plastic zone distribution of each scenario with a roof thickness of 3 m were compared. The results indicate that the stability of the stope in Hongling Lead Zine Mine is fairly good when the roof thickness is 3 m and the stope length is 35 m for the sublevel drilling stage open stope and subsequent filling mining method. [ABSTRACT FROM AUTHOR]

Agriculture has played a vital role in the development of the national economy and social stability. However, there is ever-increasing pressure on agricultural production, due to the rapid growth of population and urbanization. Chemical fertilizers, antibiotics, and feeds have also been widely used to cause serious pollution in large-scale production. Furthermore, the competition between humans and animals for grain resources (such as corn and soybeans) has increasingly come to the forefront under the rapid advancements in the livestock and poultry industry. Additionally, the fish meal can serve as a vital component in the protein and essential nutrients in aquatic feeds. Yet some challenges have posed sufficient production and safety concerns in aquaculture. Thus, new technologies are very necessary to support sustainable agriculture. Among them, microalgae have been widely used to assimilate pollutants (such as nitrogen and phosphorus), as well as contain some nutrients and bioactive substances that promote the growth of animals and plants, and the quality of agricultural products. This review aims to first summarize the current applications of microalgae and its biochar in the planting industry. Some nutrients were slowly released to enhance the physical and chemical properties of the soil, thus facilitating plant growth. Additionally, the bioactive substances derived from microalgae were used to mitigate the threats from the biotic and abiotic factors to crops, which was also used to directly stimulate plant growth and metabolism. Secondly, the recent advancements were summarized on the microalgae for livestock wastewater treatment and feed additives. Both pollutant removal and nutrient recovery were effectively achieved by utilizing the microalgae in the treatment of livestock and poultry wastewater. However, further investigations were necessary to enhance the economic viability and practicality of microalgae-based livestock and poultry wastewater treatment. The efficiency of microalgae was also enhanced to remove the pollutants from undiluted livestock and poultry wastewater. Microalgae also served as an exceptional feed additive, providing a wealth of benefits for livestock and poultry. Abundant reserves were offered for the proteins, polysaccharides, dietary fibers, and vitamins. Microalgae were also incorporated into the diets of ruminant animals, pigs, and poultry, in order to enhance the immune systems, intestinal microbial communities, and ultimately growth. Moreover, the inclusion of microalgae as a feed additive also significantly promoted the nutritional value of their products in the livestock and poultry industry. This review also provided a comprehensive overview of the research progress on the application of microalgae in aquaculture. A similar role of microalgae was achieved in aquaculture and livestock and poultry industries. In terms of agriculture wastewater treatment, the combination of bacteria and microalgae (known as the bacterial-algal symbiotic system) showed great potential for future application. Furthermore, some techniques were required to detoxify the harmful microalgae, in order to reduce the bioaccumulation of pollutants in microalgae for the safety of microalgae feed additives. Additionally, it was very necessary to evaluate the toxic behaviors of wastewater and flue gas-cultured microalgae. Furthermore, the microalgae was applied to yield significant environmental and economic benefits, according to the life cycle assessment and techno-economic analysis. Future research should be given to optimize the cultivation mode of microalgae, in order to improve their efficiency in pollutant removal and harvesting cost saving. Moreover, it is also important to clarify the toxic effects of various pollutants on microalgae and their subsequent utilization. Additionally, systematic evaluations should be conducted on the economic viability and sustainability of microalgae in agricultural applications. The finding can also provide a theoretical basis for the large-scale application of microalgae in sustainable agriculture. [ABSTRACT FROM AUTHOR]

【Objective】Functional strains with multiple biological activities were excavated from the forest rhizosphere soil of Wuliangshan National Nature Reserve, and their potential for development and application was explored.【Method】The 25 rhizosphere soil samples from different regions and plants in Wuliangshan National Nature Reserve were collected. The active strains with functions such as phosphate dissolution, nitrogen fixation, zinc dissolution, and antibacterial activity were isolated and identified using selective culture medium. The biological activities of these strains, such as secreted siderophore, ACC deaminase, and indoleacetic acid, were tested while verifying their effectiveness in promoting tomato seed germination and plant growth.【Result】70 phosphorus-dissolving bacteria, 27 nitrogen-fixing bacteria, 8 potassium-dissolving bacteria, and 51 antibacterial bacteria were isolated and identified. Among them, YIM B08401 and YIM B08402 were identified as Burkholderia alba and Pseudomonas qingdaonensis based on morphological, physiological, biochemical characteristics, and 16S rDNA sequencing. The two strains both had the activities of phosphate lysis, nitrogen fixation, zinc lysis and siderophore secretion. Their maximum soluble phosphorus content was（455.63±59.65）mg/L and（878.95±64.78）mg/L. The results of seed germination promotion tests of the two strains were similar, and the germination rates of the two strains were maintained at 82%-93% after applying the fermentation supernatant diluted 10 times, 102 times and 103 times, which was significantly higher than 56% and 49% in the control group. The length of the treatment group with the fermentation liquid of the strain significantly increased compared with the blank control group. Pot experiment showed that the above ground length, fresh weight, dry weight, stem diameter, root length, fresh weight and dry weight of the two strains in the treatment group with the most obvious growth promotion effect were significantly better than that in the control group. Compared with the control group, the above indexes of YIM B08401 significantly increased by 89%, 495%, 268%, 62%, 53%, 385% and 469%, and the above indexes of YIM B08402 significantly increased by 118%, 528% and 477%, 55%, 37%, 413% and 747%, respectively. In addition, strain YIM B08401 also had activities of antagonizing pathogenic bacteria and secreting ACC deaminase, and YIM B08402 also had the activity of secreting indoleacetic acid. 【Conclusion】The rhizosphere soil in the forest of Wuliang National Nature Reserves contained a variety of strains with biological activity. B. alba YIM B08401 and P. qingdaonensis YIM B08402 demonstrates the potential for the development and application of new microbial fertilizers [ABSTRACT FROM AUTHOR]

[Objective] The aims are to study the characteristics of precipitation, runoff and sediment transport in typical tributaries of Kongdui, quantify the impact of climate change and human activities on water and sediment changes, so as to reveal the driving mechanism of water and sediment evolution in Kongdui area, and to explore the reasons for the reduction of sediment transferring to Yellow River through Kongdui. [Methods] Based on annual precipitation, runoff and sediment discharge data from 1980 to 2018 in the Hantaichuan Basin, a typical tributary of the 10 Kongdui in the Yellow River Basin, the causes of water and sediment changes were investigated by means of linear trend method, Mann-Kendall trend test, Pettitt catastrophe test and double accumulation curve. [Results] Precipitation and runoff in Hantaichuan watershed showed a non-significant upward trend, while sediment discharge showed a significant downward trend (p＜0.05). The annual runoff and annual sediment discharge both changed abruptly in 1998. After the abrupt change, the annual average runoff decreased by 38.61% compared with that before the abrupt change, while the sediment discharge significantly decreased by 80.61% compared with that before the abrupt change. [Conclusion] Human activities are the main factors contributing to the decrease of runoff and sediment discharge in the Hantaichuan Basin, with the contribution rates of 60.38% and 59.73%, respectively, while the contribution rates of precipitation change are 39.62% and 40.27%, respectively. [ABSTRACT FROM AUTHOR]

The natural functional bacteria DDMZ1, which was domesticated and screened from the sludge samples of hydrolysis acidification reactor, was used as the immobilized composite carrier, and the immobilized DDMZ1 spheres were formed by embedding and crosslinking method. Through experiments, the decolorization efficiency of free DDMZ1 bacterial solution and immobilized DDMZ1 pellets on RB5 azo dyes was compared and analyzed. The community structure of free DDMZ1 bacterial solution and immobilized DDMZ1 pellets recycled for 20 and 30 batches were analyzed respectively to explore the differences of their community structure composition. The results show that the decolorization efficiency and rate of immobilized DDMZ1 pellets for RB5 azo dyes were better than that of free DDMZ1 bacterial solution, and there were significant differences in microbial community structure between them. The immobilization technology is conducive to the stability of community structure. The community structure composition of immobilized DDMZ1 pellets recycled for 20 and 30 times is highly similar. Escherichia-Shigella and Dysgonomonas are enriched in the two immobilized DDMZ1 pellets at the subordinate classification level. It is speculated that these two genera are the main reasons for the stability and high decolorization efficiency of immobilized DDMZ1 beads for RB5 azo dyes. [ABSTRACT FROM AUTHOR]

BACKGROUND: As an important indicator of land environmental quality, the content of petroleum substances determines the use of land. For the sample of reclaimed land, it reflects the reclamation and treatment effect of contaminated land to a certain extent. The determination methods of petroleum substances in soil samples mainly include gas chromatography, infrared spectrophotometry, and ultraviolet spectroscopy. Gas chromatography is mainly used for the determination of saturated alkanes in samples; infrared spectrophotometry is used to characterize petroleum substances in samples by measuring the characteristic absorption values at different wave numbers. OBJECTIVES: The detection limit is high. In this paper, the content of petroleum substances in the reclaimed land samples is not high, and the components are mostly difficult to volatilize, the structure is complex, and the matrix interference is large. Using n-hexane as the solvent, accelerated solvent extraction (ASE) pretreatment, and fluorescence spectrophotometer Of petroleum-based substances. The working curve was prepared with marine environmental monitoring petroleum standard materials as standard samples, and the linear correlation coefficient r 2 =0.9997; the detection limit of the method was 0.40mg/kg, and the lower limit of detection was 1.60mg/kg; the precision of the actual sample method was 1.10%~8.76 %; The recovery rate of matrix addition is 89.0%~95.7%; the results of detecting actual samples are basically consistent with the currently valid HJ 1051-2019 infrared spectrophotometric method, and the determination results of high-content samples are higher than the infrared method. The toxicity of the solvent n-hexane used in this method is less than that of tetrachloroethylene. The pretreatment method ASE has a high degree of automation, high extraction efficiency, and an increase in precision of 11.5%-67.3%. For samples with relatively complex structure of petroleum components and difficult to extract, the detection limit of this method is lower than that of infrared method (4mg/kg). [ABSTRACT FROM AUTHOR]

The chemical accident caused by the earthquake disaster is a kind of unconventional emergency with low probability and high risk. Once it happens, the seriousness of the accident caused by accidents far exceeds that of the production safety accidents in the chemical industry. In order to clarify the evolution process of earthquake cascade disasters in the chemical industry park, this paper uses the DS evidence theory to perform data fusion of expert scores through statistical analysis of relevant disaster events at home and abroad, so as to determine the Bayesian network structure and the conditions of each node variable. Probability: Use the inference function of the Bayesian model to calculate the posterior probability value of each node in the evolution network of the earthquake cascade disaster scenario in the chemical industry park. Through comparative analysis of the probability of different accidents caused by the damage of a single chemical equipment and the coupling of various direct disaster events, it is determined that the damage of storage tanks and fires are the main factors that lead to the further expansion of disasters in cascade disasters, and provide pre-earthquake prevention for chemical park, Emphasis on emergency response during an earthquake. [ABSTRACT FROM AUTHOR]

In order to systematically study the growth law of Catalpa brmgei and determine its fast - growing period and the optimal growth model, the Catalpa brmgei trees, aged from 18a to 37a, were selected as the research object in Luoning County of Henan Province. The growth data of trees was obtained through stem analysis, and a series of models were applied to fit growth process of tree height, diameter breast height ( DBH ) and volume, and the optimal growth model of Catalpa brmgei was screened. The results showed:

Objective　 To analyze the status of malnutrition for Dulong residents aged 6-80 years in Gongshan county of Yunnan in 2006 and to study it's influencing factors. Methods　 By using a stratified cluster sampling method,460 Dulong nationality residents aged 6-80 years were selected from Gongshan county in Yunnan Province. The questionnaire survey including questionnaire,and dietary survey such as body height and weight were used respectively for the survey. The status of nutrition was determined by Dulong residents' body mass index(BMI). The prevalence of malnutrition was calculated by statistics software. Multiple factors analysis were finished by non condition logistic regression in software. Results　 In 2016,of all Dulong children and adolescents aged 6-17 years,the prevalence of stunting was 16.1% and that of waisting was 1.8% in Gongshan county of Yunnan Province. Of all Dulong residents aged 18-80 years,the prevalence of underweight was 5.9%. Removing other variables,the result indicated:For the Dulong minority residents aged from 6 to 80,eaten fish(grass carp)(β:-1.116,OR = 0.328,95%CI:0.142-0.755)and tea(β:-0.899,OR = 0.407,95%CI:0.184-0.902)in the past 12 months were less possible to get malnutrition than those residents who were not. However,eaten liquid milk(low fat)(β:1.973,OR = 7.192,95%CI:1.392-37.179)in the past 12 months decreased the possibility to get malnutrition. Conclusions　 The malnutrition of Dulong residents can not be ignored. The main influencing factors of malnutrition in Dulong minority are milk,fish and tea. [ABSTRACT FROM AUTHOR]

To collect and directionally explore siderophore-producing microorganisms, the siderophore-producing microorganisms in the native forest soil of the Ailao Mountain were screened, isolated, and identified using the pure culture method. Combined with the high-throughput sequencing results of soil internal transcribed spacer (ITS) amplicons, the position of active strains in the community structure was anchored. The relationship between active strains and environmental factors was analyzed further. The results showed that all of the active siderophore-producing fungal strains screened and isolated from the Ailao Mountain valley and the original forest soils through pure culture were Ascomycetes, which belonged to Aspergillus, Penicillium, Metarhizium, Trichoderma, Talaromyces, and Beauveria. These microorganisms were mainly isolated from high altitude virgin forest areas, in which most of the soil samples had high organic matter content, high water content, low pH value, and low ferrous content. Combined with the ITS high-throughput sequencing results, the above active strains all had the corresponding operational taxonomic units (OTUs). The results of the OTUs-environmental factor analysis showed that the Penicillium strains were significantly positively correlated with organic matter content; Aspergillus strains were significantly positively correlated with pH value but had a significant negative correlation with altitude and soil water content; Trichoderma and Talaromyces strains had not significantly correlated with all environmental factors; the distribution of Beauveria and Metarhizium had certain positive correlation with pH value. Thus, it is proposed that the primitive forest environment has a selective impact on the microorganisms. The siderophore-producing Ascomycetes from the primitive forest are important functional resources worthy of further exploration and may play an important role in the circulation of soil minerals and organic matter formation. [ABSTRACT FROM AUTHOR]

Urban underground cable well, as an important infrastructure, contributes to the performance of urban functions and the coordinated urban development. However, the underground pipeline’s complex structure and huge amount of data present great difficulty in displaying, management and analysis. With the development of LiDAR technology characterized by high-speed, non-contact, high-density, and high-preci⁃ sion, point cloud data are gradually introduced into the field of building reverse reconstruction. The threedimensional reconstruction of underground cable wells based on point cloud data has gradually gathered momentum. An algorithm for topological reconstruction of underground cable well model with holes is pro⁃ posed, which can overcome the problem of model incompleteness and modeling inefficiency when point cloud as data source is used to build triangular network directly. A new hybrid model— CSG-BREP (constructive solid geometry-boundary representation) topological model is adopted to construct the 3D model, which different from the commonly used pipe-lined underground pipe network structure. In this new model, the wells are divided into walls, cables, wellbore, et al, this model can more carefully express the internal topological structure of the underground cable well. Experimental results show that the proposed algorithm can reconstruct many types of walls topologically, and the point-surface relationship between pipe holes and walls and the line-surface relationship between pipes and walls are added into the point-line and line-surface relationship of traditional pipe networks, which allows for a more accurate and detailed description.Through the test of the cable management project, the model shows good results. [ABSTRACT FROM AUTHOR]

BACKGROUND: For patients who need total knee arthroplasty, whether to use cementless or cementless fixation, which fixation method has more advantages in clinical efficacy, functional activity and prosthesis survival rate are controversial. OBJECTIVE: To compare the efficacy of cementless and cemented fixations in primary total knee arthroplasty by meta-analysis in order to evaluate the best fixation method. METHODS: PubMed, EMbase, Cochrane Library, CNKI, WanFang and CBM databases were searched. All randomized controlled trials on the efficacy of cementless and cemented fixations in primary total knee arthroplasty before June 2018 were collected. Two researchers independently screened the literature according to the inclusion and exclusion criteria, then extracted data, and conducted quality evaluation. RevMan 5.3 software was used for meta-analysis. RESULTS AND CONCLUSION: (1) Seven randomized controlled trials were included, involving 743 patients. (2) Meta-analysis results showed that there was no significant difference in the primary measurement outcome, survival rate of prosthesis [RR=1, 95%CI (0.98, 1.02), P=0.90]. (3) Secondary measurement outcomes, Knee Society Score [MD=0.28, 95%CI (-1.04, 1.61), P=0.68], Western Ontario and McMaster Universities Osteoarthritis Index score [MD=1.63, 95%CI (-0.17, 3.43), P=0.08], blood loss (intraoperative bleeding + drainage) [MD=408.52, 95%CI (-102.18, 919.22), P=0.12], incidence of joint infection [RR=0.97, 95%CI (0.34, 2.73), P=0.95] had no significant difference between two groups. The range of motion in the cementless group was superior to the cemented group [MD=3.46, 95%CI (1.12, 5.80), P=0.004]. Cementless fixation was better than bone cement fixation in clear line [RR=1.67, 95%CI (1.14, 2.46), P=0.009]. (4) In summary, for patients undergoing primary total knee arthroplasty, the effect of cementless fixation is similar to that of cemented fixation, but both of them have certain advantages in terms of joint range of motion and clear line. [ABSTRACT FROM AUTHOR]

For path planning of automated guided vehicle in the complex environment, this paper proposed a heterogeneous feature ant colony optimization algorithm based on geometric rules to solve the problem of low efficiency. Firstly.to accelerate convergence .this paper presented an inhomogeneous distribution of initial pheromone based on geometry rules. And then this paper introduced a method of incorporating perspective-taking ability to generate differently acting ant colonies in order to increase search diversity. Besides, for maintaining rapidity and randomness, this paper adopted an update rule of pheromone negative feedback and cross operator. Finally, this paper proved the convergence of GR-HFACO algorithm. Simulation results show that the path planning efficiency of the proposed algorithm is outperform those of popular ACON, TWPSS-AGO, SoSACO-v2, Sci-ACO and HHACO algorithms. [ABSTRACT FROM AUTHOR]

Objective To analyze the dietary intake and nutritional status of Nu ethnic minority residents. Methods 310 Nu minority residents of 12 Residents' committee who came from the Nu nationality concentrated areas of Gongshan County in Yunnan Province were selected with the Stratified cluster sampling method. We used the methods ofdietarysurveyquestionnaire and questionnaire surveytoobtain the condition of dietary structure among Nu minority. T- test and the nonparametric Wilcoxon rank sum test was utilized to analyze the Nu ethnic minority residents' dietary intake and nutritional status. Results Average per standard person day of 6 ~ 80 years old nu nationality residents as following: The intake of cereal and potato food, pork, aquatic products, milk and its products for Nu residents aged 6～80 years of Nu nationality was higher than the average dietary intake for Chinese residents in Yunnan Province in 2010- 2013. However, the intake of vegetable, fruit, egg, beans and its products, nuts, cooking oil and salt for Nu residents aged 6～80 years of Nu nationality was lower than the average dietary intake for Chinese residents in Yunnan Province in 2010- 2013 （ P ＜0.05） .The average daily per standard person for Nu residents 6～80 years old, In short the intake of energy, protein, fat, thiamine, riboflavin， ascorbic acid, potassium, dietary calcium, magnesium, iron, zinc and phosphorus for Nu residents aged 6～ 80 years of Nu nationality was higher than the average dietary intake for Chinese residents in Yunnan Province from 2010 to 2013. The intake of carbohydrates, dietary fiber, vitamin A and sodium for Nu residents aged 6～80 years of Nu nationality was lower than the average dietary intake for Chinese residents in Yunnan Province in 2010- 2013 （ P ＜0.05） . Conclusions The insufficient intake of nutrientsin Nu residents aged 6～80 years in Gongshan County, Yunnan province still exists. Nutritional education and intervention are needed to develop good food consumption behavior for the Nu nationality residents toand improve the status ofnutrition and health. [ABSTRACT FROM AUTHOR]

轻微型肝性脑病( MHE) 指肝性油病的初级阶段，常并发于急慢性肝功能衰竭或门体静脉分流异常的患 者。 MHE 患者仅表现为轻微的神经认知缺陷 ， 通常只能通过各种神经电生理和神经电心理测试才能发现，若不加 以治疗可进展为显性肝性脑病。 MHE 的发病机制复杂 ， 目前录常见的学说有氧化应激／亚硝化应激学说、炎性反应 学说氨中毒学说、氨基酸失衡学说、神经递质改变学说、猛中毒学说、幽 门螺杆菌与肠道微生物失衡学说等， 此外 还有低钠血症学说、锌缺乏理论、褪黑索学说等， 多种学说相互影响、相互补充。 [ABSTRACT FROM AUTHOR]

Acidolysis hydrocarbon is an important index with relatively high accuracy in the geochemical exploration for oil and gas and has been widely used. Detailed study of acid-hydrolyzed gases can help further explain its mechanism and help develop new analytical indicators. The content of acidolysis hydrocarbons and other gas released by hydrochloric acid in the samples from geochemical exploration for oil and gas by Gas Chromatography have been determined, and are presented in this paper. There is a positive correlation between the contents of methane and non hydrocarbon gas. The elements and mineral composition of the sample were measured by X-ray Fluorescence Spectrometry ( XRF ) and X-ray Diffraction ( XRD ) . respectively, whereas the gas-liquid inclusion composition was analyzed by Laser Raman Spectroscopy after sample smashing. The conclusions are as follows; ( 1 ) The content of methane and hydrogen in the acidolysis hydrocarbons is independent of the elemental composition of the sample and is positively related to the carbonate minerals. The contents of methane and hydrogen can reflect the situation of deep oil and gas. (2) Two kinds of gas do not exist in the form of physical adsorption but in the smaller space. It is proved that the analysis method of acid hydrolysis hydrocarbon has high stability. (3) There is direct evidence that two kinds of gases exist in the inclusions at the same time, which infers that two types of gases have the same source. Due to the correlation between methane and hydrogen. the content of hydrogen from acidolysis hydrocarbons will be a new analysis index in the geochemical exploration for oil and gas. [ABSTRACT FROM AUTHOR]

Yanqi Basin is one of the most important oasis agricultural areas of Xinjiang. But the ecological environment of Yanqi Basin is fragile, which depends on groundwater resources greatly. To study the spatial-temporal evolution of total dissolved solids (TDS) of groundwater is of great significance to groundwater exploitation in arid areas with fragile ecological system seriously affected by human. In order to identify the groundwater pollution status in the plain area of Yanqi Basin, 42 groundwater samples was collected in 2014. TDS and concentration of anion and cationic of the 42 groundwater samples were tested. T test was used based on the observed data of groundwater in the different periods of the plain area to determine the variability of TDS. The relationships between TDS and macro anion, macro cation, pH were analyzed with SPSS software. The results showed that TDS of groundwater was mainly affected by SO4 2-, Cl-, K++Na+, Mg2+ and Ca2+. And the TDS were highly correlated with Cl- and K++Na+. The correlation between the TDS and macro anion was highest, followed by Cl-, SO4 2-and HCO3 -; the correlation between the TDS and macro cation was also high, followed by K++Na+, Ca2+ and Mg2+. Zone map of TDS was drewn by the MAPGIS software. In the temporal scale, the average of TDS of groundwater was increased then decreased and increased again from 1983 to 2014, and the average value was 305.0, 1773.1 and 589.44 mg/L in 1983, 1999 and 2014, respectively. In the spatial scale, the TDS of groundwater evolved horizontally from piedmont to the plain area. The TDS of groundwater increased from upstream to downstream. Influenced by topography and hydrogeology conditions, the main hydrogeochemistry action changed from strong runoff to slow evaporation gradually. Area of groundwater with TDS<1 g/L showed an increasing trend but a decreasing trend from 1999 to 2014, which was consistent with downtrend of the mean value of TDS from 1999 to 2014 increased from 2011.7 to 2229.3 km2. There were 2 main reasons causing that change of groundwater TDS: 1) The groundwater table dropped from 4.98 to 7.34 m from 2000 to 2014, which prompted the solid phase calcium and magnesium soluble salts, insoluble salts and exchangeable calcium and magnesium in the soil and the lower layer sediments transferred to the groundwater; Meanwhile the increase of the groundwater table in the plain area led to high solutes concentration; 2) Urbanization had the great influence on the groundwater system. It changed the original land use patterns, and then the groundwater circulation system. And with the development of urbanization, industrial and domestic waste water increased year by year and could infiltrate into aquifer. The discharge of living and industrial waste water led to groundwater pollution, which was consistent with the dominant role of Cl- and SO4 2- in TDS. The study provide valuable information for understanding the condition of underground in Xinjiang. [ABSTRACT FROM AUTHOR]

Over the past century numerous Han Dynasty textiles woven with auspicious phrases and individual characters have been unearthed across China symbolizing the people' s aspirations for a prosperous and fulfilling life. Among them the textile with the eight-character phrase "An Le Ru Yi Chang Shou Wu Ji" (May you have peace happiness and enjoy endless longevity), discovered from the Mawangdui Han Tombs is the earliest known example of a complete auspicious inscription on a woven textile. This paper presents a preliminary analysis of the form structure and cultural significance of these eight characters based on systematic scientific testing archaeological finding and historical literature. A multidisciplinary approach is adopted to thoroughly explore the cultural value of the textiles unearthed from the Mawangdui Han Tombs with particular emphasis on their crucial role in the development of ancient Chinese textile art and technology. Comparative analysis of the textile artifacts and related ancient documents leads to three key conclusions. First textiles with inscribed characters are an important carrier in Chinese character culture offering both high artistic and aesthetic value while serving as mediums for conveying cultural ideals. The eight-character auspicious textile from Mawangdui is the earliest known Han textile with a complete woven inscription reflecting the Han people' s yearning for immortality and a harmonious life. This desire was central to the psychological and cultural outlook of the time remaining a timeless theme throughout human civilization. Second such textiles masterfully integrate Chinese characters with decorative patterns highlighting the significant role of characters in ornamental art especially in their widespread use along the Silk Road and in the Hunan region. Third Chinese character-decorated textiles have a long history of advanced techniques and may have influenced textile decoration methods in West Asia and the Mediterranean though they diverge in terms of cultural context artistic aesthetics and social functions. This paper aims to conduct a comprehensive analysis of the cultural significance of the textiles unearthed excavated from the Mawangdui Han Tombs through a multidisciplinary research approach reinforcing cultural confidence and offering valuable insights for future heritage preservation and research. [ABSTRACT FROM AUTHOR]

[Objective] To study the effect of earthworm fertilizer on soil improvement in the Mu Us sandy land of northern Shaanxi, and provide a solution to the problem of poor soil properties in the Mu Us sandy land of northern Shaanxi. [Method] Using Leymus chinensis as an indicator crop, different concentrations of earthworm fertilizer 0 t/hm² (CK), 30 t/hm² (LE-1), 45 t/hm² (LE-2), and 60 t/hm² (LE-3) were applied on sandy land. Indicators such as moisture content, porosity, and bulk density were measured, and the physical properties of Maowusu sandy land under different treatments were analyzed; soil organic matter content, available potassium content, available phosphorus content, hydrolyzed nitrogen content, pH and other indicators were measured, and the chemical properties of Maowusu sandy land under different treatments were measured; the plant height, leaf area, biomass and other indicators of crops were measured, and the agronomic traits of Leymus chinensis under different treatments were analyzed. [Result] Compared with CK, the soil moisture content of LE-1, LE-2, and LE-3 treatments increased by 1.01%-7.90%, porosity increased by 4.75%-5.31%, and bulk density decreased by 2.13%-4.14%; compared to CK, the increase in soil organic matter content ranged from 118.33% to 210.83%, the increase in available potassium content ranged from 17.04% to 94. 84%, the increase in available phosphorus content was 10.81% to 116.22%, the increase in hydrolyzed nitrogen was 242.01% to 261.27%, and the pH decreased by 1.15% to 1.39%; compared with CK, the plant height of Leymus chinensis increased by 15. 95%-27.10%, leaf area increased by 15.00%-66. 8%, and biomass increased by 43.45%-94.87%. [Conclusion] The application of earthworm fertilizer can effectively improve the physical and chemical properties of the soil in the Maowusu sandy land of northern Shaanxi, and significantly improve the biological characteristics of Leymus chinensis. The principal component analysis showed that the comprehensive improvement effect of applying 60 t/hm² earthworm fertilizer was the best, with a score of 1. 77. [ABSTRACT FROM AUTHOR]

We studied the differences in germination and seedling growth of Cyperus esculentus under different soaking agent treatments in saline alkali soil, selected suitable soaking agents, so as to provide practical theoretical basis for the cultivation and planting of Cyperus esculentus in saline alkali soil. Under salt stress conditions in the field, six different soaking agents of calcium chloride, salicylic acid, S-inducer, indole-3-acetic acid, sodium nitrate and brassinolide were used to treat the tubers of Cyperus esculentus. Through statistical analysis of field emergence and investigation of agronomic traits during the seedling stage, the differences in germination and seedling growth of Cyperus esculentus in saline alkali soil after different soaking agents treatment were analyzed, and a comprehensive evaluation was conducted. Results showed that the treatment with brassinolide had the highest emergence rate, which was 69. 33%, followed with salicylic acid treatment, which was 64. 67%, they were 70. 47% and 59. 01% higher than CK (clean water treatment), respectively. The emergence rate of each treatment has increased compared to CK. Multiple comparison results showed that the four indicators of seedling height, number of leaves, SPAD value and dry weight of leaves treated with salicylic acid were the highest and were significantly higher than those of CK. We calculated the membership function values and average membership function values of different indicators for different treatments, and ranked them in a descending order of salicylic acid, brassinolide, calcium chloride, S-inducer, indole-3-acetic acid, sodium nitrite and water. Soaking seeds with pesticides could alleviate salt damage to varying degrees and promote the emergence and growth of Cyperus esculentus in saline alkali soil. Among them, soaking seeds with 0. 5 mmol/ L salicylic acid had the best effect. [ABSTRACT FROM AUTHOR]

Objective To analyze the nutrition knowledge and attitudes and factors associated with dietary nutrition literacy of Ji Nuo, Jing Po, De Ang, A Chang, Bu Lang and Pu Mi ethnic minorities in Yunnan Province from January 2018 to August 2020. Methods The data were collected by multi-stage stratified cluster sampling in the six ethnic minorities areas of Yunnan Province. The total of 3 145 ethnic minorities aged ≥18 years were investigated the nutrition knowledge. The chi-square test and logistic analysis were done by SAS9.4 software. Results All the nutrition knowledge among the number of 3 145 ethnic minorities aged 18 years and above in Yunnan province had a median score of 8.7. The percentage of 8.3% of them had adequate dietary nutrition literacy, which was significant among different ethnic groups (χ² = 149.974, P < 0.0001) . The lowest percentage was 0.2% among Bu Lang people. Higher education levels were associated with higher literacy of dietary nutrition (OR = 1.992, OR = 3.073, P < 0.05, compared with primary school and below education level). Ji Nuo, De Ang, Bu Lang and Pu Mi people did not have adequate dietary nutrition literacy compared with A Chang people (OR = 0.105, OR = 0.366, OR = 0.010, OR = 0.341, P < 0.05). Conclusion The awareness of dietary nutrition knowledge and literacy were at a low level among six ethnic minorities aged 18 years and above in Yunnan province. The propaganda and education of dietary nutrition knowledge should be strengthened, especially the ethnic minorities with low education level so as to improve adequate literacy. [ABSTRACT FROM AUTHOR]

Fagopyrum plant is rich in resources and contained a large number of flavonoid compounds. Research history and the research hotspots of buckwheat flavonoids were summarized by literature retrieval in this study. As it was revealed, the research paper about buckwheat flavonoids was firstly published in 1952. From 1952 to 1999, the number of publishing papers was less than 10 papers per year, and the research on buckwheat flavonoids was in its infancy. Since the year of 2000, buckwheat flavonoids have gradually gained more attentions from researchers, and the numbers of publishing papers have been increased annually. In the past two decades, researches conducting buckwheat flavonoids studies mainly focused on the fields of botany, food science and technology, agriculture, and biochemistry and molecular biology. Articles referring to the antioxidant activity of buckwheat flavonoids got high citations, and the biological activities and nutritional functions of buckwheat flavonoids attracted much attention. By now, 80 flavonoid compounds have been identified from Fagopyrum. Of them, quercetin, kaempferol, luteolin, rhamnetin, isorhamnetin, tricin, naringenin, myricetin, apigenin and hesperetin were the common feature flavonoid aglycones from buckwheat. Peonidin, delphinidin and cyanidin were the anthocyanins compounds which were mostly isolated from Fagopyrum. Biosynthesis of buckwheat flavonoids originated from the phenylpropane metabolism pathway, and the key enzymes genes involved in the pathway, such as PAL, CHS, C4H, 4CL, CHI, LAR etc., and the transcription factor MYB genes were cloned and identified. MYB transcription factors played an important role in the induction and regulation of flavonoid biosynthesis, and major influence factors for the flavonoids biosynthesis included the environment factors, plant growth regulators, biological factors and varieties, and these factors could have cross regulations effects on the buckwheat flavonoids biosynthesis. In this paper, research overviews of buckwheat flavonoids, flavonoid compounds, flavonoids biosynthesis pathway, mechanism of regulation, and major influence factors are summarized, which can lay a theoretical foundation and a feasible scheme for high quality of buckwheat production during the cultivation process, and promotion of nutritional values of buckwheat products, and point out the research direction of buckwheat flavonoids in the future. [ABSTRACT FROM AUTHOR]

目的 探讨血清IL-6、降钙素原（PCT）水平在妊娠晚期B族链球菌（GBS）阳性孕妇感染状态判断中的价值。方法选择妊娠晚期GBS阳性孕妇90例（ GBS组），其中GBS带菌23例、GBS亚临床感染（以下称GBS亚感染）60例、绒毛膜羊膜炎（以下称羊膜炎）7例；选择妊娠晚期正常孕妇30例（对照组）。两组分娩后采用电化学发光法检测血清IL-6、PCT水平，分析GBS组不同GBS感染状态者血清IL-6、PCT水平变化。结果 GBS组及对照组血清IL-6水平分别为（16．96±5．23）、（2．86±0．54） pmol／mL，PCT水平分别为（0．08±0．03）、（0．04±0．02） ng／mL，P均＜0．01。 GBS组羊膜炎者血清IL-6、PCT水平均高于GBS亚感染及GBS带菌者，GBS亚感染者高于GBS带菌者（ P均＜0．01）。结论 妊娠晚期GBS阳性孕妇血清IL-6、PCT水平升高，可作为判断妊娠晚期GBS感染状态的指标。 [ABSTRACT FROM AUTHOR]

In view of the difficulty of wooden elements segmentation of three - dimensional laser scanning point cloud data of ancient building， a new algorithm for effective and accurate segmentation of ancient building’s point clouds is presented. Firstly， point cloud denoising is implemented. Then a section intersecting with wooden columns and being perpendicular to the vertical axis of the three-dimensional coordinate system is created based on structural characteristics of ancient buildings. At the same time, point clouds on the section are extracted and divided into several parts which are corresponding to different wooden columns based on point cloud Euclidean clustering. Parameters of wooden columns are estimated and used to compute the Rodrigo rotation matrix in order to implement automatic spatial transformation of ancient building’s point clouds. By this processing, vertical axis of the three-dimensional coordinate system will be strictly perpendicular to the ground. And then point clouds of wooden columns are extracted by model fitting method. Other wooden elements (such as beams, tiebeams etc.) are segmented out by bounding box created by the information of structure and size of ancient building. In order to prove the robustness and feasibility of the algorithm, the point clouds of pavilions are selected for the experiment in this study. The result shows that the algorithm is feasible and robust. This research can provide supports of theory and methods for deeply research of automatic segmentation of ancient building’s point cloud data. [ABSTRACT FROM AUTHOR]

Objective To assess the nutritional status of vitamin D and associated factors among adults of six ethnic minority groups native to Yunnan Province, and provide evidence for policy making. Methods Between May 2019 and August 2020, a total of 690 adults were selected from Jinuo, Bulang, Jingpo, Deang, Achang and Pumi ethnic groups according to the sex and age composition in the 6th national census. A questionnaire survey and an anthropometric examination were conducted by trained health workers, and serum 25 (OH) D levels were determined with high-performance liquid chromatography-tandem mass spectrometry. Results The median of serum 25 (OH) D was 28.7 ( P25～P75: 24.3 ～33.8) ng/mL, and the prevalence of vitamin D sufficiency, insufficiency and deficiency were 44.2%、 47.5% and 8.3%, respectively. There were significant differences in serum 25 (OH) D levels among the six ethnic groups (χ²=139.29, P < 0.01). Multivariate logistic regression showed that ethnic groups living in higher latitude areas (Pumi, Jingpo, Deang, and Achang), women, and those whose BMI≥24.0 were more likely to be vitamin D insufficient or deficient. Conclusion More than half of the ethnic adults suffer from vitamin D malnutrition which also varies across ethnicities. Further surveillance and interventions among key areas and populations are needed. [ABSTRACT FROM AUTHOR]

Objective To provide scientific basis for formulating strategies to improve the health management of medical personnel, we analyze the resilience level, coping styles, and influencing factors of 2 100 medical personnel under sudden public health emergencies. Methods Using the convenience sampling method, 22 medical institutions were selected from Pudong New Area, Shanghai, and a self - designed electronic survey questionnaire was distributed based on the professional characteristics of medical personnel, the resilience scale of medical personnel, and the coping style scale. Results The total score of medical staffsJ resilience was 71. 246 ± 11. 442. The total score of medical staffs' coping style was 58. 614 ± 11. 493. The results of multiple linear regression analysis showed that the main factors affecting the resilience level of medical staff were hospital type (social health service center £ = 1. 966, P = 0. 049), employment form (contract system £ = 4. 031, P < 0. 001), professional title (intermediate professional title t -1. 749, P = 0. 006), marital status (married £ = 3. 471, P = 0. 001), monthly income (5 000 一 10 000 t - 2153, P = 0. 031, > 10 000 £ = 2. 475, P = 0. 013), received psychological training(£ = 6.295, 0.001). The main factors affecting the coping style level of medical personnel were hospital type (social health service center t -2, 612, P = 0. 009), time of medical activity (11 - 20 years social health service center £ = 2. 484, P = 0. 013, > 20 years £ = 2. 594, P = 0. 010), employment form (contract system t - 3, 716, P < 0. 001), professional title (intermediate professional title t - 2.268, P = 0.023), psychological training received(£ = 6.338, P < 0.001) and occupational type (management t - 2.218, P = 0.027). Conclusion The level of resilience and coping style of medical personnel need to be improved. Meanwhile, hospital type, employment form, professional title, marital status and psychological training are the influencing factors of resilience and coping style of medical personnel. [ABSTRACT FROM AUTHOR]

目的 了解康复学院假肢矫形工程专业学生选择实习基地的意向, 为学生的实习安排和实习 基地建设提供指导依据。方法 2020 年 7-10 月采用自行设计的调查问卷, 选取昆明医科大学康复学院即将 进入临床实习的 28 名假肢矫形工程专业本科学生进行实习基地选择意向的调查。结果 考虑留在云南省内 实习的学生人数最多, 占 39.3% (11/28), 其次是成都 [28.6%(8/28)]。对北京、广州一线发达城市选择的人数 相对较少, 分别占 3.6% (1/28)、10.7%(3/28), 其他地区有重庆 [7.1%(2/28)]、武汉 [7.1%(2/28)]、郑州 [3.6%(1/28)]; 考虑实习单位是否离家近是学生选择实习基地最主要的原因 [42.9%(12/28)], 其次是对就业 有所帮助 [21.4% (6/28)] 及可促进自身能力提升 [17.9% (5/28)]。结论 了解假肢矫形工程专业学生对实习 基地的选择意向及选择动机有利于为即将到来的实践教学做出合理安排, 提高实习分配效率。 [ABSTRACT FROM AUTHOR]

In order to study the failure process and failure mechanism of steel pipe-to-sleeve grouted connections under axial tension, 16 groups of 48 pipe-to-sleeve grouted connection specimens were designed and tested. Steel plates were used to replace circular steel pipes. The crack propagation process of the grouting material was recorded. The load versus relative displacement curve of the specimen, the height-to-distance ratio of shear keys and the grouting material thickness were obtained. The influence of lateral force on the failure process and bearing capacity was analyzed. The results show that for the pipe-to-sleeve grouted connections without shear keys, the inclined cracks are randomly generated and the cracks are distributed unevenly. For the pipe-to-sleeve grouted connections with shear keys, the crack first appears at the bottom shear keys of the steel pipe, and the angle with horizontal direction was about 30°. After that there are oblique cracks at the positions of middle and upper shear keys. As the load distribution on each shear key is not uniform, the grouting materials in contact with the shear key reach the ultimate compressive stress one by one. The bearing capacity is all provided by the mechanical interlock force between the shear keys at the ultimate limit state. In the calculation of connection bearing capacity, the friction force and the cementing force can be neglected. With the increase of the height-to-distance ratio of shear key, the initial shearing stiffness of each specimen remains almost constant while the bearing capacity increases, although such increase becomes increasingly less significant. Based on this observation, the height-to-distance ratio of shear key is suggested to be in the range of 0.06 and 0.1 for practice. Similarly, the bearing capacity increases with the increase of the thickness-to-distance ratio before it reaches a threshold value, after which the bearing capacity tends to be stable. It is suggested that thickness-to-distance ratio should be larger than 0.3, and the construction requirements of grouting material should be met at the same time. [ABSTRACT FROM AUTHOR]

With the popularity of large-scale public facilities, and increasing human indoor activities,people get an urgent demand for indoor refined navigation models. In recent years, 3D reconstruction technology such as 3D laser scanning, photogrammetry and computer vision grows fast. They can acquire high-precision data quickly and efficiently, and consequently provide rich data source for indoor refined navigation. However, the methods to extract indoor navigation elements available for indoor pathfinding like rooms, doors and windows, stairs, corridors have been one of difficult and attractive fields. For this purpose, aiming at the problems in indoor navigation, this paper summarizes and evaluates various algorithms and theories for indoor navigation elements extraction from point cloud, and proposes a new idea for indoor navigation elements extraction and navigation network generation from point cloud which combines geometric and statistical methods on the basis of summarized advantages and disadvantages, and thus offers the reference for the same trade or occupation. [ABSTRACT FROM AUTHOR]

Torpedoes are one of the main threats faced by surface ships and submarines in modern naval warfare. How to defend torpedoes has always been a hot and difficult issue in various countries. This paper analyzes the working principle, technical characteristics, application conditions, advantages and disadvantages of several typical anti torpedo technologies, and on this basis, prospects the development trend of anti-torpedo technology. [ABSTRACT FROM AUTHOR]

Helium is an indispensable and rare strategic element. A method of sampling the lop helium gas in the helium gas resource investigation was used, and is described in this paper. Thermal conductivity detector (TCD) of the Gas Chromatograph was used to detect helium gas. The helium gas standard was used to study the helium gas storage container, the storage medium, the storage temperature, and the storage time. Results show that the glass jar, the saturated salt water, the low temperature, and the inverted storage are the best methods to save the head space gas. At room temperature, the helium head space gas storage period is about 2 months, whereas under refrigerated conditions (4°C ) , the storage lime reaches 3 months. Therefore, the author suggests that the helium head space gas collection method is as follows. The fresh soil samples are collected in a 500 mL glass bottle, and then are injected into the saturated sail water. A 50 mL space remains in the bottle, and then the bottle is sealed by silica gel and kept inverted. For the helium top gas stored under normal temperature and refrigerated conditions, the lest should be completed within the corresponding storage period to ensure the accuracy of the lest data. [ABSTRACT FROM AUTHOR]

Background Sleep disorder can adversely affect human physical and mental health, with important implications for socioeconomic development. And higher vocational college students are subject to various pressures and stimuli exerted by academic studies, job seeking and family socioeconomic status, which may contribute to the onset insomnia symptom or sleep disorder.Objective To discuss the sleep status and influencing factors among higher vocational college students, and to provide references for improving their sleep status.Methods In January and February, 2022, a stratified random sampling method was utilized to enroll 3 300 students from five higher vocational colleges in Wenjiang district of Chengdu city. All the participants were assessed using Insomnia Severity Index（ISI）, Patient Health Questionnaire Depression Scale-9 item（PHQ-9） and Generalized Anxiety Disorder Scale-7（GAD-7）. Pearson correlation analysis was conducted to test the correlation of ISI with PHQ-9 and GAD-7scores, and the Logistic regression analysis was performed to identify the influencing factors of insomnia symptom in higher vocational college students.Result Insomnia symptom was detected in 81. 90%（2 497/3 300） of higher vocational college students. The detection rate of insomnia symptom among vocational college students yielded statistical difference in terms of gender, family socioeconomic status, being an only child or having siblings, degree of psychological pressure exerted by academic studies or job seeking, amount of hours spent on Internet per day, frequency of physical exercise, and the presence or absence of anxiety symptom and depression symptom （χ2=21. 032, 22. 172, 8. 983, 75. 939, 36. 781, 32. 350, 54. 512, 86. 561, P＜0. 01 or 0. 05）. Among higher vocational college students, ISI score was positively correlated with GAD-7 and PHQ-9 scores（r=0. 620, 0. 714, P＜0. 01）, and GAD-7 score was positively correlated with PHQ-9 score（r=0. 824, P＜0. 01）. Gender, family socioeconomic status, degree of psychological pressure exerted by academic studies or job seeking, amount of hours spent on Internet per day, frequency of physical exercise, and the presence or absence of anxiety symptom and depression symptom were effective factors in predicting the insomnia symptom in higher vocational college students（P＜0. 01 or 0. 05）.Conclusion Female gender, average and below average family socioeconomic status, moderate-to-severe degree of psychological pressure exerted by academic studies or job seeking, spending 2～5 h, 5～7 h or ＞7 h on Internet per day, inadequate physical exercise and presence of depressive symptom are the risk factors for insomnia symptom in higher vocational college students. [ABSTRACT FROM AUTHOR]

Objective To analyze contrast enhancement features and diagnostic value of CT in mandibular arteriovenous malformation (AVM). Methods The clinical data and contrast-enhanced CT features of 8 patients with mandibular AVM including position, shape, border, internal structure, enhanced density change, and peripheral vasculature of the AVM as well as adjacent bone and soft tissue invasion were retrospective analyzed. Results CT in 7/8 (87.5%) AVMs showed destruction of the mandible with thinning of the bone cortex, increased marrow cavity and loss of trabeculae. One AVM showed a low-density lesion of the inner capsule of the maxilla without soft tissue mass. Contrast-enhanced CT showed maxillofacial soft tissue masses with blood vessel distortion and significant enhancement to CT values of 100-140 HU in all 8 AVMs. 7/8 AVMs were fed by the external carotid arteries with large veins draining into the internal and external jugular veins. Only small blood vessels were visualized in 1 lesion. Conclusion CT enhancement characteristics can delineate the extent and blood supply of maxillofacial AVM. [ABSTRACT FROM AUTHOR]

Aiming at the intelligence problems of the end integral joint for dual-arm robot, the control and drive unit on end integral joint for dual-arm robot was designed, and the design principles and methods were induced and analyzed. With comprehensive utilization of CAN bus technology and sensor technology, and based on the digital signal processor DSP and the intelligent power module IPM, the system hardware was designed. Combined with advanced control theory and based on iterative learning control, the improved fuzzy adaptive tuning PID control algorithm was presented. The compliant control methods and implementation plans for the end integral joint were proposed. The prototype was designed and developed, and the closed-loop control test experiments were carried out. The practices indicate that, the design meets requirements for the closed-loop control on the end integral joint, has advantages including good stability, high reliability, compact structure, small volume and high integration, and improves the lightweight and intelligence design. It has important theoretical and practical value for the intelligence of the integral joint research on dual-arm robot. [ABSTRACT FROM AUTHOR]

With the widespread application of gallium nitride (GaN) in the high-power field, the heat dissipation of GaN based devices has become the main factor restricting the power density. Therefore, it is crucial to develop novel thermal management solutions. Diamond substrates with high thermal conductivity can be used to improve the heat dissipation of GaN devices. However, due to the natural lattice mismatch between diamond and GaN, the direct epitaxy of GaN on diamond substrates remains an insurmountable problem. This work achieved van der Waals epitaxy of single crystal GaN films on polycrystalline diamond substrates using a two-dimensional material / Al gradient AlGaN heterostructure as the nucleation layer between the substrate and the epitaxial layer. Among them, two-dimensional materials can effectively shield against the adverse effects caused by lattice mismatch between the substrate and epitaxial layer, while the Al component gradient AlGaN buffer layer can achieve orderly migration of Ga and N atoms, thereby accurately controlling the growth of GaN thin films. This work provides a novel approach for high-quality growth of nitrides on heterogeneous substrates. The experimental results indicate that the introduction of nucleation layers effectively eliminates the impact of lattice mismatch, thereby breaking the bottleneck of the difficulty in directly epitaxial single crystal GaN films on diamond substrates. This work provides a foundation for further improving the power density of GaN based devices. [ABSTRACT FROM AUTHOR]

Objective To assess the nutritional status of vitamin A among adults of ethnic minority groups native to Yunnan Province, and provide scientific evidence for healthy eating promotions. Methods Between 2016 and 2020, 841 adults were randomly sampled from seven ethnic minority groups according to the sex and age composition in the 6thnational census. The serum retinol level was determined using high-performance liquid chromatography (HLCP), and judged by the WHO criteria. Vitamin A intake was calculated through a dietary survey and judged by reference to the dietary guidelines. Results The median serum vitamin A concentration was 0.55 mg/L (ranging from 0.44 to 0.68 mg/L) and significant differences were found in sex, race, education and income levels (all P < 0.05). The prevalence of vitamin A deficiency and marginal deficiencies were 0.7% and 3.7%, respectively. The median of dietary vitamin A intake was 406.0 µg retinol equivalents (RE) and 67.0% of the subjects consumed less vitamin A than the Chinese Estimated Average Requirement (EAR). The major food sources of vitamin A were dark vegetables, eggs, light vegetables and meat, accounting for 86.6% of total vitamin A intake. Conclusion The serum vitamin A concentration is relatively good in the population, whereas inadequate vitamin A intake remains a problem, especially for certain ethnic groups, older and poor adults. [ABSTRACT FROM AUTHOR]

Objective: To investigate the correlated factors and predictors of mild cognitive impairment in patients with Parkinson's disease and its clinical characters. Methods: According to the diagnostic criteria of Movement Disorder Society Task Force for Mild Cognitive Impairment in Parkinson's Disease, 81 PD patients were evaluated by Montreal Cognitive Assessment (MoCA), and Unified Parkinson's Disease Rating Scale (Ⅰ-Ⅲ). Results: In 81 PD patients, 47 cases (58 %) were with mild cognitive impairment PD-MCI and 23 cases (28 %) were with no cognitive impairment (PD-NCI).Patients (14 %) with mild impaired cognition had a disease duration of less than 5 years. There was significant difference between PD-MCI and PD-NCI group in education (P<0.05), H&Y stage (P<0.05), the L-dopa equivalent daily dose (LEDD) (P<0.05); the score in PD-MCI group was significantly lower in visuospatial and executive functioning (P <0.05), delayed recall (P <0.05), attention (P <0.05), language (P <0.05) and abstract (P <0.05) subdomains compared with that of PD-NCI group .The difference of UPDRSⅢ and postural instability and gait difficulty (PIGD) were statistically significant in two groups (P<0.05). MoCA score of PD-MCI group was negatively correlated with age (r =-0.31, P<0.05),H&Y stage (r=-0.44,P<0.05), UPDRS-Ⅲ(r=-0.32, P<0.05), UPDRS-Ⅱ(r=-0.35, P<0.05), UPDRS-Ⅰ(r =-0.40, P<0.05), bradykinesia (r=-0.38, P<0.05) and PIGD (r=-0.31, P<0.05), and MoCA score of PD-MCI group was positively correlated with education (r=0.30, P<0.05). Including MoCA score as the dependent variable, and age, H&Y stage, education, UPDRS-Ⅲ, UPDRS-Ⅱ, UPDRS-Ⅰas the independent variables, PD-MCI was predicted by age (β coefficients-0.06, P<0.05) and H&Y stage (β coefficients-0.80, P<0.05). Furthermore, multiple regressions with UPDRS subscale scores were conducted to examine their unique contributions to cognitive function. When including bradykinesia and PIGD subscale scores, only bradykinesia predicted PD-MCI (β coefficients-0.12, P<0.05). Conclusions: Mild cognition impairment is one of the common non-motor symptom with highly prevalence in PD, which is mainly characterized by the dramatic impairments in the cognitive domains of visuospatial and executive functioning, delayed recall, attention, language. Poorer cognitive performance is associated with increasing disease severity, age, movement disorder and education, especially in bradykinesia and PIGD. Mild cognitive impairment may be predicted by age, H&Y and bradykinesia. [ABSTRACT FROM AUTHOR]

In order to improve the search ability of AGV in complex unknown environment, this paper proposed an improved DDPG. It constructed the empirical playback matrix and double-layer network structure to improve the convergence speed of the algorithm ε-greedy in the green search strategy, to solve the local optimization problem of AGV in selecting the optimal action. To solve the problem of slow training speed of deep neural network, it applied priority sampling to depth deterministic strategy gradient algorithm. In order to solve the problem of high complexity of ordinary priority sampling, this paper proposed a small batch priority sampling method to train the network. In order to verify the effectiveness of the method, it used the grid method to model and compare the simulation experiments in different complex environments. It compared the loss function, iteration times and return value of different algorithms. The experimental results show that compared with the original algorithm, the improved algorithm reduces the loss function, reduces the number of iterations and increases the return value, which verifies the effectiveness of the algorithm. At the same time, it provides a new idea for AGV to complete the planning task more safely and quickly in complex environment. [ABSTRACT FROM AUTHOR]

In the context of economic transformation, it is of great theoretical and practical significance to explore the impact of land capitalization on real economic growth. Different from the homogenized understanding of land capitalization, this paper proposes that case of land capitalization can be divided into moderate and excessive ones. Following this view, this paper first theoretically analyzes the impact of different degrees of land capitalization on the real economy, then makes an empirical study based on the micro data of Chinese industrial enterprises, and finally analyzes the current risks and reasons of excessive land capitalization in China. The results show that the degree of land capitalization and the real economy present an inverted U‑shaped relationship. Excessive capitalization exceeding the limit will promote the rise of total factor costs, thereby inhibiting the growth of the real economy. Judging from the inverted U-shaped turning point estimated by empirical data, the current urban economy is already facing a serious problem of excessive land capitalization in China, which may harm the real economy and affect the growth prospects of the Chinese economy. Further analysis shows that Chinese‑style decentralization may be the institutional reason for the excessive deepening of land capitalization. This paper provides important policy implications: Land capitalization is a double‑edged sword, and the key to gaining benefits and avoiding harm is to control the degree of capitalization. China must carry out the coordinated reform of performance appraisal, land market and land tax system to correct excessive land capitalization. In order to achieve high‑quality development and the transformation and upgrading of the real economy, China should take the initiative to change the support mode of land capitalization, reform the expenditure structure of land capital gains, and increase the expenditure on new infrastructure, science and education, and people's livelihood. [ABSTRACT FROM AUTHOR]

Acetamiprid has a high detection rate but is not registered on peach in China. Lack of information such as application or pre-harvest intervals may lead to irrational pesticide use and high residue risks. In order to identify the residue risks of acetamiprid in peach fruit, degradation experiments and simulated farmer application experiments were carried out. Also, from 2015 to 2018, the acetamiprid residues in peach from nine main producing areas in China were investigated and the dietary intake risk was analyzed. The results showed that the degradation of acetamiprid in peach peel and pulp conformed to the first-order kinetic equation, and the half-lives were 3.92 and 3.14 d, respectively. Simulated farmer application experiments showed that the residual amounts at 7, 14 and 21 d after last application were low in both applications and far lower than the maximum residue limit(MRL), and removing the peach peel can drastically reduce the intake risks. The detection rate in 509 peach samples from the nine producing areas ranged from 8% to 38%. Residues value was between 0.001-1.348 mg/kg and all the residues did not excess the MRL. For 4 consecutive years, the ratio of acute dietary intake risk to ARfD on peaches was in the range of 1.520%-13.755%, and the ratio of chronic dietary intake risk to ADI was in the range of 0.021%-0.086%, which accounts for a small contribution to the overall dietary exposure. [ABSTRACT FROM AUTHOR]

BACKGROUND: In recent years, more attention has been paid to the protection of the environment in China. More damaged or polluted land needs to be reclaimed. When evaluating the effect, it is necessary to detect several pollutant indexes for phenolic pollutants. In the direct determination of phenolic compounds by gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS), there are challenges such as low chromatographic response, poor stability and high detection limit. OBJECTIVES: To establish a method to determine 19 phenolic pollutants in reclaimed land. METHODS: Based on the characteristics of complex matrix, multiple interference factors, and difficult pre processing of reclaimed land samples, the extraction and purification methods of this type of sample were screened and optimized. The extraction and purification methods were determined by comparing the effects of derivatization: and non-derivatization, combined with comprehensive research on the optimization of derivatization conditions and the measurement results of actual samples. A derivatized gas chromatography-mass spectrometry method for detecting 19 phenolic pollutants in reclaimed land samples was established (Among them, 2,4,6-trichlorophenol and 2,4,5-trichlorophenol, 2,3,4.S tetrachlorophenol and 2,3,5,6 tetrachlorophenol were combined because of could not be separated). The samples were extracted with a-hexane and acetone (1: 1. V/V) by ASE. The extract was concentrated, purified and derivatized by pentafluorobenzyl bromide. Finally, it was determined by GC-MS internal standanl method. RESULTS: The standard - addition recoveries were 73.3% -107.0%. The method detection limits of phenolic compounds in soil were 0. 67-3.95g/kg, which was significantly lower than nonderivative method (10-80 µg/kg). The derivatives had better stability and higher chromatographic response, the groups were more even in peak height (area) on the chromatogram. The derivatization method had better reproducibility and the results of low - concentration samples were more accurate. CONCLUSIONS: This method can be used effectively to avoid matrix interference and provide reference for trace determination of phenolic pollutants in soil samples with complex matrix. [ABSTRACT FROM AUTHOR]

Objective To understand the molecular typing and drug resistance of Salmonella typhimurium in Yunnan Province, to provide scientific basis for preventing and controlling diseases caused by Salmonella typhimurium. Methods Molecular typing was carried out according to Salmonella PFGE typing technology published by PulseNetChina. The MIC value of the drug sensitive plate was obtained from the analysis of the instructions, and the results of S, I and R were obtained according to the corresponding standards of CLSI. Results The 68 strains salmonella typhimurium in Yunnan Province showed 53 types of PFGE. The drug resistance rate of the 68 strains of salmonella typhimurium was the highest for the compound sulfonamide (SXT), 45.59%, and the most sensitive to imipenem(IMP), among which one strain was resistant to 11 of the 14 antibiotics. Conclusion The molecular typing of salmonella typhimuriumin in Yunnan province is diverse. Compound sulfonamide is the most resistant antibiotic of Salmonella typhimurium in this region. Multiple drug resistance of Salmonella typhimurium in this region is atypical. [ABSTRACT FROM AUTHOR]

Objective To explore the effects of PPARγ agonist rosiglitazone and inhibitor T0070907 on apoptosis and anti-tumor in renal carcinoma A498 cells．Methods A498 cells were divided into three groups and PBS， rosiglitazone （50 滋mol/L） and T0070907 50 （μmol/L） were added respectively of 24 h incubation completely. each group of cell proliferation was determined by MTT method and Western Blot analysis and RT-qPCR were applied to detect the expression level of BAX， Caspase 3， Cyt C and Bcl - 2. A498 cell morphological changes were observed under light microscope and fluorescence microscope. Results MTT experiment results showed that rosiglitazone and T0070907 could significantly inhibit A498 cell proliferation rate （P< 0.05）， increased the protein and mRNA expression levels of Caspase 3，Cyt C and Bax in A498 cell， and decreased the protein and mRNA expression levels of Bcl - 2 （P ＜0.05）；Microscopic observation and Hochest staining also found that rosiglitazone and T0070907 could promote apoptosis of A498 cells. Conclusion Rosiglitazone and T0070907 can inhibit the proliferation of renal cell carcinoma A498 cells and induce apoptosis. The anti-tumor mechanismmay be related to PPARγ mediation. [ABSTRACT FROM AUTHOR]

Objective: To investigate the expression of Ezrin and P53 in colorectal carcinoma and its relationship with clinicopathological features. Methods: A total of 140 patients with colorectal cancer, who were treated in Cangzhou People's Hospital of Hebei Province from May 2014 to June 2016. were selected. After resection of colorectal cancer tissues and the exclusion criteria, 94 cases of cancer tissues (as study group) were included in this study. And extracted from the study group. 35 cases of normal colorectal mucosa tissues taken from surgical specimen margin were selected as control group. The expression of Ezrin and P53 were detected by immunohistochemistry. and the correlation between them was analyzed. Results: The positive expression rate of Ezrin and P53 in the study group were 52.13% and 56.38%. significantly higher than 0.00% in the control group (x225.731, 33.496. P<0.05). The positive expression rate of Ezrin and P53 in the patients with high and middle differentiation were 46.99% and 51.81%. significantly lower than those (90.91% and 90.91%) in the patients with low and undifferentiated (x2=7.508, P<0.05; x2=4.401. P<0.05). The positive expression rate of Ezrin and p53 in the patients with lymph node metastasis were 77.05% and 68.85%. significantly higher than those (6.06% and 33.33%) in the patients without lymph node metastasis (x2=43.245, P<0.05; x2=15.846. P<0.05). The positive expression rate of Ezrin in patients with invasion depth in T3 and T4 were 55.81. significantly higher than that(12.50%) with invasion depth in T1 and T2 (x2=5.503. P<0.05). The positive expression rate of Ezrin and p53 hi the patients with TNM stage III and IV were 88.24% and 74.51%, significantly higher than those(9.30% and 34.88%) with TNM stage I and II (x2=5.522. P<0.05: x2=5.036, P<0.05). Among 49 Ezrin positive patients. 11 patients were positive P53 expression: among 56 case of Ezrin negative patients. 14 patients were negative P53 expression. The expression of Ezrin was not correlated with the expression of p53 (r=0.209. P>0.05). Conclusion: Both Ezrin and P53 proteins are correlated with the occurrence and development of colorectal cancer, which is helpful for the prognosis judgement of colorectal cancer. [ABSTRACT FROM AUTHOR]

ObjectiveTo compare the curative effect of Zina and Sextant screwing system in the treatment ofthoracolumbar fracture．MethodsA total of 53 patients included who underwent minimally invasive spine surgeryfor unstable thoracolumbar fracture without neurological deficit from Jan 2013 to Apr 2014．30 patients were treatedwith Zina system and 23 patients were treated with Sextant system．The two groups were compared in terms ofperioperative indexes, Cobb angle, visual analogue scales （VAS）, Oswestry disability index （ODI） andhospitalization expenses．ResultsAll patients were followed up for 12～24 （mean, 16.9） months．Comparewith Sextant group, Zina group had significantly shorter surgery time, less intraoperative X-ray exposure, bloodloss and hospitalization expenses （P＜0.05）．The cobb angle, VAS and ODI at one week, 3 and l 2 months afteroperation were significantly improved in all the patients （P＜0.05）, but the differences between the two groups werenot significant （P＞0.05）．ConclusionsThe two minimally invasive pedicle screw systems are effective in thetreatment of thoracolumbar fractures, but compared with the Sextant system, Zina system can shorten the operationtime, reduce the intraoperative bleeding, X-ray exposure and hospitalization cost．Therefore, the Zina systemmay be preferable in the treatment of thoracolumbar fracture without neurological deficit． [ABSTRACT FROM AUTHOR]

Objective: To investigate the clinical effect and safety of Sorafenib and interferon in the treatment of middle and advanced renal cell carcinoma. Methods: The Cclinical data of 20 patients with renal cell carcinoma undergoing radical surgery or resection of the primary tumor, such as palliative surgery was were collected from September 2011 to May 2014 in Harbin medical university fourth urology clinical medical school. The tumor diameter ≥7 cm, and postoperative pathology was confirmed in as advanced renal cell carcinoma, associated associating with metastatic lesions or venous tumor thrombus. Patients were divided into groups ofthe targeted therapy and immunotherapy group, 8 patients Twere divided into the targeted therapy group in which 8 patients, while immunotherapy group was consisted of 12 patients. The treatment effect, incidence of adverse reactions and completion of treatment were recorded and compared between two groups. Results: The objective response rate to drug of immunotherapy group(50%) was lower than that of the targeted therapy group(75%), the total effective rate(83.3%) was also lower than that of the targeted therapy group(87.5%), the difference was not statistically significantno significant difference was found between two groups(P>0.05). Compared with the targeted therapy group, the incidence rates of fever, oral mucositis, hand-foot syndrome and rash were significantly higher in the immunotherapy group(P<0.05). The percentage of patients exiting the treatment of immunotherapy group was significantly higher than that of the targeted therapy group(P<0.05). Conclusions: Targeted therapy with Sorafenib was more effective and had higher safty than immunotherapy with interferon in the treatment of middle and advanced renal cell carcinoma. [ABSTRACT FROM AUTHOR]