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Copyright of Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao is the property of Chinese Journal of Applied Ecology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Transactions of Beijing Institute of Technology is the property of Beijing University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Diagnostic Imaging & Interventional Radiology is the property of Editorial Office of Diagnostic Imaging & Interventional Radiology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Computer Engineering & Science / Jisuanji Gongcheng yu Kexue is the property of Computer Engineering & Science and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Transactions of Beijing Institute of Technology is the property of Beijing University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Progress in Modern Biomedicine is the property of Publishing House of Progress in Modern Biomedicine and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Research & Exploration in Laboratory is the property of Research & Exploration in Laboratory and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Shandong Medical Journal is the property of Shandong Medical Health Newspapers and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Shandong Medical Journal is the property of Shandong Medical Health Newspapers and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Application Research of Computers / Jisuanji Yingyong Yanjiu is the property of Application Research of Computers Edition and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In this paper, taking No. 1 main transfomer of a 220kV substation as the research object, the premise during the temperature test and the butterfly value operation sequence are introduced under the condition of load operation and the general changing law of daily load rate is summarized. By opening and closing the radiator butterfly valve to change het dissipation condition of transforer, relationshps between opening butterfly valve quantity and transformer temperature rise is drawn and the relationships between transformer oil temperature and valve opening and closing, environment temperature, wind speed, load loss or other factors are analyzed. Through controlling load rate and the butterfly valve, the outlet oil temperature can be effectively controlled, which lays a solid foundation for the utilization of the waste heat of the transformer. [ABSTRACT FROM AUTHOR]

In order to explore the best propagation mode of Osmanthus fragrans cutting, improve the cutting survival and rooting rate of perennial mother trees, the new semi-lignified branches with strong growth and no diseases and insect pests were used as test materials, the effects of different kinds of plant growth regulators（naphthalene acetic acid（NAA), indole butyric acid（IBA）） and concentrations（100, 200 mg/L）, treatment methods（water immersion treatment, ethanol solution quick dip treatment, talcum powder treatment） and cutting substrates on the survival roots of cuttings of O. fragrans were compared and analyzed. The results showed that the survival rate of O. fragrans cuttings under 200 mg/L NAA water immersion treatment was the highest, up to 80.89%. The rooting rate, mean root number and mean root length were 73.37%, 9.47 pieces/plant and 9.0 cm respectively, which were increased by 560.99%, 84.60% and 162.39% compared with the control group. The comparison of different cutting substrates showed that perlite was the best, followed by river sand, and 1 yellow subsoil+2 vermiculite or pure vermiculite was poor. The best combination of cutting propagation of new branches of O. fragrans was to take perlite as the matrix and soak in 200 mg/L NAA for 2 hours. [ABSTRACT FROM AUTHOR]

Objective To investigate the expression changes and significance of microRNA (miR)-145 and miR-765 in the esophageal squamous cell carcinoma tissues. Methods Eighty patients with esophageal squamous cell carcinoma were selected and the expression levels of miR-145 and miR-765 in the cancer and adjacent tissues were detected by real time fluorescence quantitative polymerase chain reaction (qRT-PCR). Immuno-histochemical staining was used to detect tis sue proliferative nuclear antigen and the percentage of positive cells was calculated as proliferation index (PI). Apoptosis index (AI) was detected by TdT-mediated deoxyuridine notch end labeling (TUNEL). The relationships between the miR-145 and miR-765 expression in esophageal squamous cell carcinoma tissues and the clinicopathological characteristics of patients were analyzed. At 36 months after follow-up, the survival of patients with different miR-145 and miR-765 expression were observed. The risk factors for death of patient were analyzed. Results The miR-145 expression and Al in the esophageal squamous cell carcinoma tissues were significantly lower than those in the paracancerous tissues, and the miR-765 ex pression level and PI were significantly higher than those in the paracancerous tissues (all P <0.05). Pearson correlation analysis showed that the miR-145 expression was negatively correlated with PI (r= -0.522, P=0.023), and positively correlated with AI (r=0.578, P=0.011). The miR-765 expression level was positively correlated with PI (r=0.602. P=0.000), and negatively correlated with Al (r= -0.511, P=0.017). The miR-145 and miR-765 expression levels were related to the tissue differentiation degree and TNM stage (all P<0.05). Log-rank test showed that the survival rate of the high miR-145 expression group was significantly better than that of the low miR-145 expression group, and the survival rate of the low miR-765 expression group was significantly better than that of the high miR-765 expression group(both P <0.05). Results of Cox analysis showed that low differentiation, TNM stage III, low miR-145 expression and high miR 765 expression were risk factors for death in patients with esophageal squamous cell carcinoma(all P<0.05). Conclusions There is abnormal high expression of miR-765, and low expression of miR-145 in esophageal squamous cell carcinoma tissues, both of which are associated with cancer cell proliferation. Detection of their expression is helpful for the diagnosis and survival evaluation of esophageal squamous cell carcinoma. [ABSTRACT FROM AUTHOR]

As we embark on a new era of big data and Artificial Intelligence (AI)，supercomputing centers and data centers raise an ever-increasing demand for high-performance storage systems from petabyte-scale to exabyte-scale. In recent years, High-Performance Computing (HPC) systems have been widely used for big data and AI applications. The I/O patterns of new emerging AI applications show a characteristic of small batch-processing file accesses, which makes HPC storage system designs increasingly complicated. Parallel File System (PFS) primarily designed for bandwidth-oriented applications is one of the most effective ways to manage data for HPC systems. However, existing PFSs are not capable of providing high performance for AI applications. This paper focuses on investigating and improving the system performance of BeeGFS, which is a new emerging PFS for HPC systems. We propose a Key-Value (KV)-based metadata management module to improve IOPS of metadata accesses, introduce asynchronous I/O and multi-threading technologies into parallel I/O processing module to improve I/O processing concurrency, and employ multi-track communication mechanism to increase networking bandwidth. Our experimental results show that the modified BeeGFS can significantly improve the performance of both metadata and data accesses, and achieve as high as 2 times scores than the original BeeGFS under the 10500 benchmark. [ABSTRACT FROM AUTHOR]

In the era of exascale computing and big data, High Performance Computing (HPC) systems have been widely deployed as the infrastructure for big data analytics, in order to leverage their parallel computing capabilities. As the I/O patterns in HPC systems get increasingly complicated and heterogeneous, breaking through the I/O bottleneck is challenging and urgent for HPC systems. In recent years, flash-based storage arrays and storage servers have been gradually deployed in HPC storage systems. However, the conventional shared storage architectures, I/O software stack，and storage networking designs are primarily for Hard Disk Drives (HDD)，which induces severe I/O overhead in the 1/O path and prevents the HPC storage systems from taking full advantage of the performance benefits from Non-Volatile Memory (NVM). To achieve low I/O latency, high concurrent I/O throughput, and high burst I/O bandwidth, this paper proposes a regional shared and high concurrent storage architecture. We design an NVMeoF-based burst I/O storage pool (NV-BSP)，which implements the key techniques such as virtualized storage pool resource management and NVeoF network storage communication based on Tianhe high-speed Internet. It has horizontal and vertical expansion capabilities and can effectively support Burst I/O acceleration and low-latency remote for specific computing tasks. Besides, we further propose a Quality-of-Service (QoS) control strategy for the storage systems with HPC and big data mixed applications. The experimental results on a prototype system show that NV-BSP achieves the scalable write performance as the number of I/O handling threads increases. Compared with the built-in MD-RAID in Linux，NV-BSP obtains higher I/O bandwidth. Compared with the node-local storage pool，I/O latencies of NVMeoF-based remote storage only increase 59. 25us for read and 54. 03us for write. By disaggregating storage from computation, NV-BSP significantly improves the system scalability and reliability while delivering the comparable performance to local storage. [ABSTRACT FROM AUTHOR]

The influence of torsion speed, tension and direction on the number of torsion turns of CTMH150 contact line is studied by torsion test.and the relationship between torsion moment and the number of torsion turns is analyzed. It is found that the number of torsion turns of copper alloy contact line decreases firstly and then increases with the increase of torsion speed and tension, and there exists a transition point. And the 2 r/min and 3 r/min are turning points of torsion speed.while the 755 N is the turning points of tension. The number of torsion turns in the process of bidirectional torsion is larger than that of unidirectional torsion. In addition.the torque of the contact line is linearly correlated with the number of torsion turns. [ABSTRACT FROM AUTHOR]

The mechanical behavior of fabricated partially encased composite (PEC) beams was investigated by testing 12 specimens under unidirectional cyclic loads. The main test variables were the shear span ratio, concrete thickness and screw arbors etc. The researching results show that: with the increase of shear span ratio, the failure mode of the specimens changes from shear failure to bending failure. In the later stage of loading, some specimens show asymmetric concrete damage on both sides of the web, which leads to additional torsion on the specimens besides bending and shearing. The screw arbors not only enhance the confining effect of steel on concrete and prevent the local buckling of compressed steel flange, but also play the role of shear connection and ensure the composite action between steel and concrete. The concrete thickness has a great influence on the bearing capacity of specimens with a small shear span ratio, but has only a small effect on specimens with a large shear span ratio as its effect on the flexural capacity of normal section is limited. According to the superposition principle, a formula for calculating the shear capacity of fabricated PEC beams was proposed. On the basis of plane section assumption, a method for calculating the bending capacity of fabricated PEC beams was developed. A three-line model was proposed to reflect the normalized relationship between Vm and Mm. [ABSTRACT FROM AUTHOR]

To study the evolution characteristics of unloading damage and deformation of underlying coal and rock during the protective layer mining period, FLAC3D numerical simulation was conducted based on the actual conditions of Baode Coal Mine in Shanxi Province, China. In-situ investigations were also adopted to verify the simulation results on stress, deformation and plastic property evolution laws. The results show that the stress of the protected layer increases firstly, then decreases and after which increases again during the mining process. The spatial distribution of stress on underlying coal and rock shows an obvious “O” shape. Influenced by the protective layer mining, the measurement points in underlying coal seam experienced four stages including original rock stress, stress concentration, mining pressure relief and stress recovery. The ratio of the maximum stress concentration factor and the minimum unloading stress is a constant value, and the occurrence of the two extreme values shares the same time. The stress concentration factor in front of the working face and the unloading ratio behind the working face all change reciprocally, and the change period is related to the cycle stress from the working face. In this paper, the maximum stress concentration factor is about 1. 32, at which time the value of the z-direction stress at the measuring point is the largest. The minimum pressure relief ratio is about 4. 4% and the z-direction stress value at the measuring point is the smallest at this time and the pressure relief effect is also the best. Under the effects of changing stress, the deformation of the protected layer presents the basic rule of compres-sion-recovery-expansion-retraction cycle. The final state maintains a certain expansion deformation, which corre-sponds to the stress zoning. According to the different deformation characteristics, the underlying coal seam can be divided into original rock state zone, compression deformation zone, pressure relief expansion zone and de-formation recovery zone. The example in this paper shows that the maximum expansion deformation of No. 11 coal seam was 0. 6%. The cracks at the monitoring points developed well and the permeability increased significantly, which was conducive to gas pressure relief and extraction. Under the influence of stress changes, the plastic area increased in triaxial directions first, then increased in x-axis direction but y-axis and z-axis direction kept stable. With the advance of working face, the plastic zone of coal body in protected seam increased continuously in the x-axis direction. By measuring the in-situ stress and expansion deformation of No. 11 coal in the mining process of 81307 working face in Baode Coal Mine, the numerical simulation results of the evolution characteristics of unloading damage and deformation during deep mining were verified. The variation laws of in-situ stress and expansion deformation of No. 11 coal agree well with those of numerical simulation. [ABSTRACT FROM AUTHOR]

At present,some mines have reached the end of their life cycle,do not meet the requirements for safe production,or suffer from a lack of financial viability forcing them to face closure or abandonment.If such a mine is closed or abandoned,it will not only cause a huge waste of resources,but also lead to subsequent safety,environmental,and social problems.It is very difficult to exploit and utilize the remaining resources of such closed/abandoned mines in China.In addition,it is impossible to copy the utilization patterns used abroad in foreign waste mine resource handling.Therefore,the overall country strategy,foundation theory,and key technologies lie ahead.Five key scientific problems are posed with a view to improving the exploitation and utilization of closed or abandoned mines in China,namely an analysis of the coupling mechanism of high-efficiency conversion and utilization via underground coal gasification,environmental protection mechanisms for underground space storage based on precise and intelligent control,intelligent precision development modes for mine water and unconventional energy based on multi-field coupled theory,renewable energy development and micro-grid energy transfer modes in closed/abandoned mines,and industrial tourism development based on ecological restoration and environmental support.The work has important political and economic strategic connotations to the development and utilization of closed/ abandoned mine resources and a strategic path under the new normal state of coal resources is proposed.It is of significance to those seeking to improve the efficiency of exploitation and utilization of abandoned mine resources. [ABSTRACT FROM AUTHOR]

At present，the control mode of the tracing ribbon is relatively simpleand working state can't be directly monitored by the operating personnel. In order to solve this problem，the control and protection systemis designed. The system can automatically detect the working current and ambient temperature of each tracing ribbonand working condition of original tracing ribbon’s temperature control switch. In this way，the manual function of temperature control switch is added，the upper computer real - time monitoring function is realized and the reliability and stability of tracing ribbon operation are effectively improved. [ABSTRACT FROM AUTHOR]

This paper using planar equiangular spiral antenna as a sensor for UHF detection of bushing partial discharge, based on the introduction and analysis of sensor technology and the characteristics of UHF partial discharge detection for bushing, combining the characteristics of transformer bushing accidents, verifies that planar equiangular spiral antenna has the advantages of wide bandwidth, high sensitivity, low loss, and delay stability, with the performance meeting the requirements of local source identification and location, through the performance comparison and the on site application of 4 typical discharge models including closed bushing tap poor contace, creep age discharge of porcelain bushing, suspended discharge of strapping and suspended discharge at the top. [ABSTRACT FROM AUTHOR]