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Based on the fast detection of mycotoxins and heavy metals in grain by each storage enterprise of Beijing reserve grain, the real-time migration of monitoring data is realized by adopting the B/S architecture, terminal WEB browser, and using the wireless transmission function of the rapid detection equipment to collect and transmit the data through the encryption algorithm; by using P2MP point-to-multipoint network communication, the data collected by multiple devices online/offline are uploaded through the file uploading system and the relational database extraction tool to achieve synchronous integration of data from multiple sources; by using relational database MySQL, column storage database HBase and distributed file system HDFS, distributed full-text search ElasticSearch and distributed memory database Redis to achieve cloud storage; by using Storm for real-time computation, Streaming for streaming operation, Spark for memory computing, and MapReduce for batch computing to achieve rapid processing of monitoring data; by using artificial intelligence technology and MLlib/Mahout for data mining and modelling to form a spatial and temporal sequence model of Beijing's grain producing areas and credit evaluation model of grain purchasing and marketing enterprises, so as to achieve the dynamic early warning of grain quality and safety and visual expression of the data, and provide early warning judgments to facilitate real-time control by government departments and real-time response to the situation. It promotes real-time control, real-time response and traceability management of grain quality and safety by management departments, enhances healthy competition and the establishment of an integrity system in grain circulation and storage, and provides a scientific basis for government decision-making.

BackgroundThe reactor period will dramatically decrease at the beginning of reactivity insertion in the nuclear reactor, which may trigger the protection system of the reactor period and lead to unnecessary shutdown. The instantaneous short reactor period is influenced greatly by the inserting rate of reactivity, but also related with the present delayed neutron precursors, which is difficult to quantify.PurposeThis study aims to explore the relationship between the instantaneous short reactor period and the inserting rate of reactivity from a theoretical perspective.MethodsA point reactor model was used to deduce the inserting rate of the reactivity function using the variable factors of reactivity, reactor period, and reactor dynamic parameters, with some conservative assumptions to omit the effect of delayed neutron precursors. The relationship between reactivity insertion rate and transient period of reactor was derived after analysis on the short period phenomenon. Then, the formula of relationship was verified for several transient cases.ResultsThe results show that the reactor periods are all larger than the aim reactor periods for all transient cases when using the rate constraint of reactivity insertion in the aforementioned formula. According to the proposed theoretical framework, unnecessary shutdown during an instantaneous short reactor period can be avoided.ConclusionsA theoretical framework proposed in this study can be applied to the control of rod withdrawal rate during the operation of nuclear reactors.

To evaluate the mechanism of governor vessel electroacupuncture in rats with post-stroke limb spasm by observing the changes of glutathione antioxidant system-related factors. Methods A total of 60 SD rats were randomly divided into the normal group (n=12), sham operation group (n=12) and modeling group (n=36). The middle cerebral artery obstruction model was prepared by thread approach method in the modeling group, and 24 rats with successful modeling were randomly divided into the model group and the electroacupuncture group, with 12 rats in each group. At the 3rd day after modeling, the electroacupuncture group was treated with electroacupuncture at three acupoints of the governor vessel, namely, "Dazhui" (GV14), "Jizhong" (GV6) and " Houhui" (anteromedial of the transverse process of the sixth lumbar vertebra), for 30 min each time, once a day for 7 days. The neurological function of rats was assessed by Zea Longa neurological deficit score. The muscle tension of rats was detected by modified Ashworth dystonia rating and electrophysiological tracing method. The brain tissue water content was measured by the dry-wet weight method. The volume of cerebral infarction of rats was measured by the TTC staining method. The contents of glutathione(GSH), catalase(CAT), oxidized glutathione(GSSG), superoxide dismutase(SOD), and malondialdehyde(MDA) in the cortex of rats were detected by colorimetry. The protein and mRNA expressions of glutathione reductase(GR), glutamate cysteine ligase(GCL)C, GCLM, and glutathione peroxidase 4(GPX4) in the cortex of rats were measured by Western blotting and real-time PCR, respectively. Results Compared with rats in the normal and sham operation groups, the Zea Longa neurological deficit score, modified Ashworth dystonia rating, the volume of cerebral infarction, brain tissue water content, and GSSG and MDA contents in cortex were increased in the model group, the tension signal value and the proteins and mRNA expressions of GR, GCLC, GCLM, and GPX4 in cortex were decreased, and the contents of GSH, CAT, and SOD in cortex were decreased(P<0.05). Compared with the model group, the Zea Longa neurological deficit score, modified Ashworth dystonia rating, the volume of cerebral infarction, brain tissue water content, and GSSG and MDA contents in cortex were decreased in the electroacupuncture group, the tension signal value and the proteins and mRNA expressions of GR, GCLC, GCLM, and GPX4 in cortex were increased, and the contents of GSH, CAT, and SOD in cortex were increased(P<0.05). Conclusion Governor vessel electroacupuncture can improve the severity of post-stroke limb spasm in rats, and its mechanism may be related to the regulation of glutathione antioxidant system in cerebral cortex. [ABSTRACT FROM AUTHOR]