A Novel Sensor Scheduling Algorithm Based on Deep Reinforcement Learning for Bearing-Only Target Tracking in UWSNs

Dear Editor,This letter is concerned with the energy-aware multiple sensor coscheduling for bearing-only target tracking in the underwater wireless sensor networks(UWSNs).Considering the traditional methods facing with the problems of strong environment dependence and lack flexibility,a novel sensor scheduling algorithm based on the deep reinforcement learning is proposed.Firstly,the sensors’co-scheduling strategy in UWSNs is formulated as Markov decision process(MDP).

老旧小区加装电梯施工质量问题研究

近年来我国老旧小区内钢结构电梯加装工程项目逐渐增多,然而国家对于老旧小区电梯加装的把控并没有明确的工程规范,导致在电梯加装的过程中频频发生质量事故。论文以昆明某小区钢结构电梯加装为例,对钢结构电梯施工过程中可能存在的问题进行深入分析和探讨,并提出相应的建议和方法以此来减少加装电梯在施工和使用过程中出现事故的概率。

户外广告全生命周期风险源的识别评价与管控

基于目前国内外户外广告设施的行业现状,参考各地出台的户外广告设施的行业标准,对较为常见的户外广告牌进行分类。分别对各种类的户外广告设施全生命周期中设计、施工和使用阶段的风险源进行识别分类。并引入LEC风险源评价方法对各类户外广告设施全生命周期中的风险源进行半定量地评价。参考国内外先进地区对于户外广告设施出台的相关法律法规,对户外广告设施全生命周期风险源的管控从政策方面提出一些建议。

昆明市老旧小区增设电梯之困境及应对策略

针对昆明市老旧小区增设电梯集体行动难、资金筹措难、审批程序难困境,本文基于目前昆明市老旧小区增设电梯工作的进展情况,并结合其他城市增设电梯政策和实践经验,为昆明市老旧小区增设电梯提出几点应对策略。

海内外EPC项目风险分析及对策研究

EPC模式作为我国总承包企业承包国外工程项目的主流模式,充满了各种自然、技术以及项目管理风险,本文以中材建设贝宁水泥厂项目等5个具有代表性的海外EPC项目为例,对比分析国内EPC项目与国际EPC项目中所涉及风险的不同侧重点,指出我国企业在承包国外项目时的困难之处并提出解决措施。

The impact of oceanic processes on the transient climate response: a tidal forcing experiment

In this study, the impact of oceanic processes on the sensitivity of transient climate change is investigated using two sets of coupled experiments with and without tidal forcing, which are termed ExpTide and ExpControl,respectively. After introducing tidal forcing, the transient climate response(TCR) decreases from 2.32 K to 1.90 K,and the surface air temperature warming at high latitudes decreases by 29%. Large ocean heat uptake efficiency and heat storage can explain the low TCR in ExpTide. Approximately 21% more heat is stored in the ocean in ExpTide(1.10×10^24 J) than in ExpControl(0.91×10^24 J). Most of the large ocean warming occurs in the upper 1 000 m between 60°S and 60°N, primarily in the Atlantic and Southern Oceans. This ocean warming is closely related to the Atlantic Meridional Overturning Circulation(AMOC). The initial transport at mid-and high latitudes and the decline in the AMOC observed in ExpTide are both larger than those observed in ExpControl. The spatial structures of AMOC are also different with and without tidal forcing in present experiments. The AMOC in ExpTide has a large northward extension. We also investigated the relationship between AMOC and TCR suggested by previous studies using the present experiments.

Solidification Behavior and Microstructures Characteristics of Ti-48Al-3Nb-1.5Ta Powder Produced by Supreme-Speed Plasma Rotating Electrode Process

In this study,the characteristics and solidification behavior of Ti-48Al-3Nb-1.5Ta powder produced by supreme-speed plasma rotating electrode process(SS-PREP®)were investigated.The microstructure,phase and characteristics were analyzed by scanning electron microscopy,X-ray diffraction and other methods.The atomization mechanism is direct drop formation.The relationship between the particle size and cooling rate is vc=3.14×10^(-7)·d^(-2)+1.18×10^(-2)·d^(3/2),and the relationship between secondary dendrite arm space and the particle size isλ=0.028d+0.11,as well as the relationship between SDAS and cooling rate isλ=4.84×10^(-5)·T^(-1.43).With increase in particle size,the surface structure gradually changes from the featureless smooth structure to dendritic and cellular dendritic morphology,and the flow ability becomes better.The carbides mainly exist within 5 nm of the surface and the oxidation layer is about 20 nm thick.Ti-48Al-3Nb-1.5Ta powder was mainly composed ofα2 phase andγphase.With increase in particle size,the content ofγphase increases,and the hardness decreases accordingly.The 106–250μm particles are composed of multiple grains with the grain size of 70–80μm.The microstructure,phase composition and hardness of different TiAl powders with the same size are similar,but the elastic modulus is different.

Advances in research of the mid-deep South China Sea circulation

The South China Sea(SCS)is a large marginal sea connecting the Indian and Pacific oceans.Under the factors of monsoons,strait transport,and varied bathymetry,the SCS presents a three-layer structure and strong diapycnal mixing which is far greater than that in the open ocean.Theoretical analysis and observations reveal that internal tides,internal solitary waves,and strong winds are the sources of the strong mixing in the northern SCS.A major consequence of the strong mixing is an active mid-deep circulation system.This system promotes exchange of water between the SCS and adjacent oceans,and also regulates the upper layer of wind-driven circulation,making the 3 dimensional SCS circulation clearly different from that in other tropical and subtropical marginal seas.The mass transport capacity of the mid-deep circulation has a substantial impact on marine sedimentation,the biogeochemical cycle,and other processes in the SCS.This paper summarizes the recent advances in middeep sea circulation dynamics of the SCS,and discusses the opportunities and challenges in this area.

Paired Immunoglobulin-like Receptor B Inhibition in Müller Cells Promotes Neurite Regeneration After Retinal Ganglion Cell Injury in vitro

In the central nervous system(CNS),three types of myelin-associated inhibitors(MAIs) have major inhibitory effects on nerve regeneration.They include Nogo-A,myelin-associated glycoprotein,and oligodendrocyte-myelin glycoprotein.MAIs possess two co-receptors,Nogo receptor(NgR) and paired immunoglobulin-like receptor B(PirB).Previous studies have confirmed that the inhibition of NgR only results in a modest increase in regeneration in the CNS;however,the inhibitory effects of PirB with regard to nerve regeneration after binding to MAIs remain controversial.In this study,we demonstrated that PirB is expressed in primary cultures of retinal ganglion cells(RGCs),and the inhibitory effects of the three MAIs on the growth of RGC neurites are not significantly decreased after direct PirB knockdown using adenovirus PirB shRNA.Interestingly,we found that retinal Müller cells expressed PirB and that its knockdown enhanced the regeneration of co-cultured RGC neurites.PirB knockdown also activated the JAK/Stat3 signaling pathway in Müller cells and upregulated ciliary neurotrophic factor levels.These findings indicate that PirB plays a novel role in retinal Müller cells and that its action in these cells may indirectly affect the growth of RGC neurites.The results also reveal that PirB in Müller cells affects RGC neurite regeneration.Our findings provide a novel basis for the use of PirB as a target molecule to promote nerve regeneration.