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[Objective] Conventional positioning stiffness of rail transit vehicle bogies results in significant lateral forces between wheels and rails, leading to substantial wear and reduced operational efficiency when navigating curves with small to medium radii. To enhance the operational stability and curve negotiation performance of rail transit vehicles, an active radial system for bogies is proposed. [Method] The active radial system and the control principles are introduced. The software and hardware design process of the radial controller is outlined. A vehicle dynamics model is established, integrating with other system components. The functionality and performance of the radial controller are verified through semi-physical simulation experiments and circular track tests. [Result & Conclusion] Whether adopting a guided active detection mode or a precise beacon detection mode, the radial controller can effectively detect curve segments, aligning the bogie wheelsets toward radial positions during curve negotiation in accordance with the actual track information. When entering or exiting curves, the radial controller can drive the radial actuator to act immediately or in advance, effectively reducing the lag time. Simulation and circular track test results demonstrate that trains equipped with bogies featuring the active radial system exhibit a consistent and significantly lower variation in wheel-rail lateral force compared to conventional passive curve negotiation states. The performance of the guiding wheelsets is particularly outstanding. The proposed active radial controller improves the curve negotiation performance of trains and reduces wheel-rail wear.

With the rapid development of new energy generation technology, the thermoelectric generation technology (TEG) can make good use of the waste heat generated in new energy generation. However, the change of temperature distribution will worsen the output characteristics and reduce the power generation efficiency of the TEG system. In this paper, a TEG array reconfiguration method based on the artificial bee colony (ABC) algorithm is proposed. In three different temperature distributions, ABC is used for dynamic reconfiguration of symmetric 9×9 and unsymmetric 10×15 TEG arrays. Three meta-heuristic algorithms, the genetic algorithm, the particle swarm optimization algorithm, and the bald eagle search are compared with the proposed method, and the temperature distribution of the TEG array reconfiguration by ABC is given. The results show that ABC can improve the output power of the TEG array, and the output power-voltage curves tend to show a single peak value. In addition, real-time hardware-in-the-loop (HIL) experiment based on the RTLAB platform is undertaken to verify the implementation feasibility.

ObjectiveThe purpose of this paper is to obtain the hydro-acoustic modulus of high-strength polyvinyl chloride (PVC) foam through an inversion algorithm based on the measured underwater acoustic insertion loss values of the composite samples, then improve the calculation accuracy of the insertion loss of the composites. MethodsFirst, the static elastic modulus of high-strength PVC foam is obtained through mechanical tests such as compression and tension, and then the insertion loss of the sandwich composite is calculated using the transfer-matrix method. The reason for the large difference in the calculated values and the measured values obtained by the acoustic pulse-based tube method is that the input value of the elastic modulus of the core material is low. Based on the measured insertion loss values, the underwater acoustic modulus values of five PVC foam samples are then calculated via genetic algorithm inversion. ResultsThe quantitative calculation results indicate that the hydro-acoustic modulus value of high-strength PVC foam is higher than the measured static elastic modulus values. The average ratio of hydro-acoustic modulus to compressive modulus is 1.24, and that to tensile modulus is 1.36. ConclusionWhen calculating the hydro-acoustic performance of sandwich composites containing high-strength PVC foam, the error can be reduced by positively correcting the input value of the material's elastic modulus on the basis of the measured value of the static modulus.

Background and objective Epidermal growth factor receptor-tyrosine kinase inhibitors (EGFR-TKIs) is the first choice for first-line treatment of advanced patients with EGFR positive non-small cell lung cancer (NSCLC). For advanced NSCLC patients with negative drive gene and positive programmed cell death ligand 1 (PD-L1) or highly expressed NSCLC patients, the first-line treatment recommends immune checkpoint inhibitors (ICIs) monotherapy or ICIs combined chemotherapy. Therefore, the first-line treatment strategy for advanced NSCLC patients with EGFR positive at different PD-L1 expression levels is worth further exploring. Many previous studies have suggested that the expression of PD-L1 is obviously affected by EGFR mutation, and the expression of PD-L1 is likely to be related to the mechanism of EGFR-TKIs resistance. The purpose of this study was to analyze the expression characteristics of PD-L1 in patients with advanced EGFR positive NSCLC and its relationship with the efficacy of EGFR-TKIs. Methods 159 patients with newly diagnosed advanced NSCLC with EGFR positive (including 141 patients with EGFR sensitive mutations) were enrolled to analyze the relationship between clinicopathological characteristics and PD-L1 expression. The factors affecting the therapeutic effect of EGFR-TKIs in 141 patients with EGFR sensitive mutations were also explored. Results The PD-L1 expression of the included patients was classified according to the tumor promotion score (TPS): negative (TPS

At present, there are only a few researches on the hydrogen embrittlement risk of titanmium alloy in the realm of warship. Based on the reality that titanium alloys are more and more widely used in the field of warship, the hydrogen embrittlement risk of titanium alloy applied in the realm of warship was analysed by means of electrochemical test, corrosion simulation calculation and model corrosion test. Results showed that the hydrogen embrittlement risk of titanium alloy was high when it contacted directly with the cathodic - protected hull steel in seawater environment. It was recommended to take electrical insulation measures for all contact parts between titanium alloy and hull steel in seawater medium environment to cut off electronic circuits.

For service robots， security reconnaissance vehicles， etc. their mobile range is large and working space is complex. The drive system is vulnerable to impact， blocking or overload due to external impact， thereby resulting in tooth fractures and large bending of support shafts. The application of micro servo drive system is greatly limited. Aiming at this problem， a clutch structure is proposed to protect miniature reducer in this study. Using the finite element method， basic parameters of the spring and the protection threshold of the clutch structure is designed. Then， the threshold is captured and verified through the clutch performance test rig. Experimental results show that the miniature reducer can realize the clutch function accurately under the overload condition， and the measured clutch protection threshold is in good agreement with the design threshold. The clutch structure can limit the maximum threshold of the gear load， enable the gears of the miniature reducer to work within the design load range and improve the working reliability of the miniature reducer.

Type-B sleeve repair is one of the main permanent repair methods for long-distance oil and gas pipelines at present. However, fillet weld defects are often produced during the operation, which need to be detected and evaluated by phased array ultrasonic method. In order to further study the capability of phased array ultrasonic testing method in detecting the defects in the fillet weld of type-B sleeve, the calculation model of phased array testing for fillet weld of type-B sleeve was established with the developed ultrasonic numerical simulation program, and the simulation on propagation sound field, testing signal and image of phased array ultrasonic in fillet weld of type-B sleeve was realized. On this basis, the detection capabilities of different phased array ultrasonic testing methods for defects at different positions in the weld were compared and analyzed. Finally, the simulation results were verified by experiments. The research results could provide theoretical basis and technical means to optimize the phased array ultrasonic testing method for weld of type-B sleeves.

Text classification is a basic and important task in natural language processing.Most of the text classification methods based on deep learning only focus on a single model structure.The single structure lacks the ability to simultaneously capture and utilize both global and local semantic features.Besides,the deepening of the network will lose more semantic information.In order to overcome the above problems,a text classification model FMNN which is a text classification model fused with multiple neural network is proposed in this paper.The model combines the performances of BERT,RNN,CNN and Attention while minimizing the network depth.BERT is used as the embedding layer to obtain the matrix representation of the text.BiLSTM and Attention are used to jointly extract the global semantic features of the text.CNN is used to extract the local semantic features of the text at multiple granularities.The global semantic features and local semantic features are applied to the softmax classifier respectively.The results are finally fused by arithmetic average.The experimental results on three public data sets and one judicial data set show that the proposed FMNN model achieves higher accuracy rate,and the accuracy rate on the judicial data set reaches 90.31%,which proves that the model has good practical value.

Peel strength is the key performance indicator for 3 PE coating, and the repeatability and reproducibility of peel strength test results will be significantly affected by the difference between different test methods and the preciseness of standards. Considering that the procedures of peel strength test specified in the appendixes of the current national and international product standards are too simple and not stringent enough with the test methods varying greatly, the effects of peeling rate, peeling angle, test temperature, peeling length and result evaluation on the results of peel strength test were studied, the value of the test parameters and the specific operating requirements were defined, and suggestions on peel strength test method and failure mode of 3 PE coating were put forward. Based on this research, Test method for measurement of peel strength of multilayer polyolefin coating systems(NACE TM 21420-2018) and pipeline coating test method-Part 2: Peel strength test(SY/T 4113.2-2018) were formulated.

Sequence stratigraphy is used for analytical comparison and paleogeographic reconstruction of lithologic sections in Paleogene Kumugeliemu Group in western Kuqa Depression under the framework of sequence and systems tract to establish the reservoir-caprock assemblage and allocation system and to predict the distribution of favorable reservoir sandstones. Two sets of coarse fragment sands are developed in the 3rd order sequences Esq1 lowstand systems tract and Esq2 lowstand to transgressive systems tract. The widely distributed salt and gypsum muddy section of Esq1 and Esq2 has good sealing and forms good reservoir-caprock assemblage with the two reservoirs in the bottom sand section of Kumugeliemu Group. According to the reservoir sandbody distribution, the forwarding fluvial system at mountain front to the north, fan delta at east flank of Wensu uplift to the west, and the downcut valley filling and fluvial delta system at Yingmai low paleo-uplift to the south form favorable reservoir sandbodies. Kelasu-Dabei zone on north margin of the depression, Qiulitage-Quele and its southward parts, and northern and eastern Wensu uplift are the favorable places. Key words: sequence and systems tract, depositional system, reservoir-caprock assemblage, Kumugeliemu Group, Kuqa Depression

Objective To investigate the effect of selective cerebral deep hypothermic perfusion on the neurological function of rhesus monkey after severe brain ischemia. Methods Nine rhesus monkeys were given blocking bilateral common carotid arteries for 10 min at room temperature, and then keeping selective cerebral deep hypothermic perfusion for 60 mins, and then giving natural rewarming. After three days, the experimental animal central nervous function scale was used to evaluate the nerve function every week for 12 weeks. Results After three days evaluation (13.56 ± 1.81), part of the experimental animals had such symptoms as coma, lethargy, lameness, etc., and needed to survive in captivity. After two weeks neurological evaluation (16.11 ± 1.76), animals could survive independently. Compared with before operation, the neurological function in experimental animals was significantly lower 3 days after operation, and was gradually increased 1 week after operation. There were statistically significant differences in the neurological function score between 3 days to 6 weeks after operation and before operation (P < 0.05), but no statistically significant difference between 7 to 12 weeks after operation and before operation (P > 0.05) . Conclusions Selective cerebral deep hypothermic perfusion after severe brain ischemia in Rhesus monkeys can significantly avoid severe hemiplegia, coma, vegetative state survival or death caused by cerebral ischemia, and can significantly improve the prognosis of cerebral ischemia. [ABSTRACT FROM AUTHOR]

Objective To explore the significance of monitoring the brainstem function by monitoring brainstem auditory evoked potential and somatosensory evoked potential in cerebellopontine angle tumor surgery. Methods 28 cases of cerebellopontine angle tumors (⩾ 3cm) were given neurosurgery for resection of tumors, the brainstem auditory evoked potential, somatosensory evoked potential and free-run electromyogram were monitored during the surgery. Post-operative brain stem and cranial nerve function were observed. Result Tumor removal was found in 23 cases (82%), partial resection in 5 cases (18%), brain stem injury in 1(4%), facial nerve preservation in 25 cases (89%). Conclusions Brainstem auditory evoked potential, bilateral upper extremity somatosensory evoked potential and free-run electromyogram should be recorded in the resection of cerebellopontine angle tumors, which can provide the functional state of brain stem for the surgeon in time, to avoid cranial nerve injury. By monitoring the upstream pathway of feeling can reflect some extent state of the ipsilateral brainstem function. [ABSTRACT FROM AUTHOR]

In the channel structure of the manufacturer operating the traditional channel and e-channel in the same time, the e-channel is divided into online direct selling and the e-channel, which is operated by the third party - virtual trading community, such as Taobao Mall, etc.. The channel selection strategies in e-channel for the manufacturer are investigated based on the chasm theory, and the investigative results show that the manufacturer should select the direct selling channel when the market sharing is more than the chasm value; otherwise, the selection is the opposite. And the optimal pricing strategies are given both in the centralized and decentralized decision. It is found out that the added profits come from the increasing demand for the traditional channel or the e-channel. Furthermore, from the point of view of the manufacturer, the cooperation strategy selection is analyzed for the manufacturer and the retailer in the cooperation scenario. The revenue sharing strategy for e-channel is given in the case that the retailer manages the e-channel, which is efficient to coordinating the supply chain and promoting the supply chain performance. [ABSTRACT FROM AUTHOR]

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