MOTE的空基反导军事概念模型描述

探讨了基于隐身无人机平台的空基反导军事概念模型,提出了基于MOTE的空基反导军事概念模型描述方法,研究了空基反导的任务概念、作战概念、技术概念和装备概念。介绍了空基反导军事概念模型效能评估的框架和原则,最后给出了空基反导所涉及的关键技术。通过该研究,为发展空基反导装备和作战使用提供了新的思路和方法,对构建空基反导体系具有指导意义。

Mote无线感知网络的研究与实现

研究了Mote感知网的组成模式、网络路由、低能量消耗及数据处理和管理,分析和展望了一些有价值的应用领域,并进行温度、光、电压等数据的采集实验,网络拓朴结构实验,编程实现了对数据的分析、处理。

空位缺陷掺杂单层MoTe2的研究

采用基于密度泛函理论的电子结构计算软件包Atomistix Tool Kit(ATK),研究了缺陷掺杂的单层MoTe2,计算了五种单空位缺陷的原子结构和3%~12.5%浓度范围内的形成能,分析了空位浓度对单层MoTe2相变的影响.研究结果表明Te空位的形成能比Mo空位的低,调节Te空位的浓度能实现单层MoTe2的1H和1T′相之间的相互转变.

MoTe2的电子结构及光学性质的理论研究

利用密度泛函理论第一性原理方法对MoTe2的能带结构、能态密度和光学性质进行了理论计算,得到能带结构、态密度、光吸收谱、能量损失谱和介电函数等光学性质。结果表明:MoTe2具有间接带隙宽度为1.066 eV的半导体材料,价带主要由Mo的5s4p价电子和Te的5s5p价电子起主要作用;导带由Mo和Te的4d价电子起主要作用。由获得的光学性质可知,介电函数的实部和虚部的峰值都出现在低能区;位于可见到紫外区域的光子具有很强的吸收,最大吸收系数为2.84×105cm-1;同时在光子能量为16.40 eV处出现了共振现象,其它区域内电子之间共振非常微弱。这些光学性质奠定了该材料在制作微电子和光电子器件方面的作用。

Electronic properties of size-dependent MoTe2/WTe2 heterostructure

Lateral two-dimensional(2D) heterostructures have opened up unprecedented opportunities in modern electronic device and material science. In this work, electronic properties of size-dependent MoTe2/WTe2 lateral heterostructures(LHSs)are investigated through the first-principles density functional calculations. The constructed periodic multi-interfaces patterns can also be defined as superlattice structures. Consequently, the direct band gap character remains in all considered LHSs without any external modulation, while the gap size changes within little difference range with the building blocks increasing due to the perfect lattice matching. The location of the conduction band minimum(CBM) and the valence band maximum(VBM) will change from P-point to Γ-point when m plus n is a multiple of 3 for A-mn LHSs as a result of Brillouin zone folding. The bandgap located at high symmetry Γ-point is favourable to electron transition, which might be useful to optoelectronic device and could be achieved by band engineering. Type-II band alignment occurs in the MoTe2/WTe2 LHSs, for electrons and holes are separated on the opposite domains, which would reduce the recombination rate of the charge carriers and facilitate the quantum efficiency. Moreover, external biaxial strain leads to efficient bandgap engineering. MoTe2/WTe2 LHSs could serve as potential candidate materials for next-generation electronic devices.

Survey on Motes Used in Wireless Sensor Networks: Performance &Parametric Analysis

Wireless Sensor Networks (WSNs) are used to sense certain parameters in an environment, manipulate the acquired data and transmit/receive the information in an intra or inter communication network. Innovative researches in WSNs have resulted in the increase of application scenarios, which, at a time instant, were not even well-thought-of to be automated by WSNs. With this advent, it becomes necessary to customize sensor nodes depending on node specific characteristics and the deployment environment. Challenges for designing a WSN depend on the scenario in which it is implemented. Commercially available wireless motes are mostly generalized for usage in most of the applications. This survey work aims to provide an insight on the various wireless motes available in the market. This will enhance future researchers to select wireless modules which might be most suitable for their application needs. Various parameters related to the technical and implementation characteristics of WSNs were considered in this survey. This survey also concentrates with the survey on individual RF modules based on certain parameters like frequency of operation, transmission power, receiver sensitivity, interface mechanism, data rate, active, sleep & power-down current consumptions, range and cost involved.

Motes percentage and ginning outturn as affected with cotton cultivar and location

The present study was conducted to analyze cotton cultivar and location differences in motes, and to determine the relationships among these and ginning outturn. Therefore, the seed cotton of five promising hybrids namely;G.77 × Pima S6 and G.84 × (G.74 × G.68) growing in [Kafr El-Sheikh - Kafr El-Dawar - Etay El-Barood - Damietta], G.89 × Pima S6 growing in [El-Sharkia - El-Gharbiya - El-Dakahliya - El-Monofiya], G.83 × (G.75 × 5844) × G.80 and G.90 × Australian growing in [Sohag - El-Minia - Beni-Sueif - El-Faium] were used in this study. The results obtained indicate that the varieties exhibited different behavior responses to environmental conditions. On the whole, environmental factors associated with differences in place of growth, appeared to have much more influence on the number of motes than did varietal factors. Most of the locks for the promising hybrids at the different locations tend to cluster around the mean of 6 or 7 seeds per lock. There is a fairly marked tendency for the lock index, lint weight and lint percentage to decrease as the motes percentage increase. On the other hand, most of the promising hybrids under study tend to increase in the seed index as the motes percentage increase. However, the increasing in seed index as a result of the increasing in motes percentage for some cotton cultivars growing at different environments could be explain the difference in behavior for these cotton cultivars in lint percentage.

In-Motes EYE: A Real Time Application for Automobiles in Wireless Sensor Networks

Wireless sensor networks have been identified as one of the key technologies for the 21st century. In order to overcome their limitations such as fault tolerance and conservation of energy, we propose a middleware solution, In-Motes. In-Motes stands as a fault tolerant platform for deploying and monitoring applications in real time offers a number of possibilities for the end user giving him in parallel the freedom to experiment with various parameters, in an effort the deployed applications to run in an energy efficient manner inside the network. The proposed scheme is evaluated through the In-Motes EYE application, aiming to test its merits under real time conditions. In-Motes EYE application which is an agent based real time In-Motes application developed for sensing acceleration variations in an environment. The application was tested in a prototype area, road alike, for a period of four months.

What is Wise Blood?——Wise Blood in Hazel Motes

As one of the most popular novels in O'Connor's works, Wise Blood is heated discussed by critics home and abroad.Wise blood, as the major image in the novel, flows in the body of both Hazel Motes and Enoch Emery who are the main protagonists. This thesis aims to analyzes the overtone behind wise blood so as to present a different angel of understanding this novel.

Two-dimensional polarized MoSSe/MoTe2 van der Waals heterostructure: A polarization-tunable optoelectronic material

Two-dimensional (2D) heterostructures have shown great potential in advanced photovoltaics due to their restrained carrier recombination, prolonged exciton lifetime and improved light absorption. Herein, a 2D polarized heterostructure is constructed between Janus MoSSe and MoTe_(2) monolayers and is systematically investigated via first-principles calculations. Electronically, the valence band and conduction band of the MoSSe−MoTe_(2) (MoSeS−MoTe_(2)) are contributed by MoTe_(2) and MoSSe layers, respectively, and its bandgap is 0.71 (0.03) eV. A built-in electric field pointing from MoTe_(2) to MoSSe layers appears at the interface of heterostructures due to the interlayer carrier redistribution. Notably, the band alignment and built-in electric field make it a direct z-scheme heterostructure, benefiting the separation of photogenerated electron-hole pairs. Besides, the electronic structure and interlayer carrier reconstruction can be readily controlled by reversing the electric polarization of the MoSSe layer. Furthermore, the light absorption of the MoSSe/MoTe_(2) heterostructure is also improved in comparison with the separated monolayers. Consequently, in this work, a new z-scheme polarized heterostructure with polarization-controllable optoelectronic properties is designed for highly efficient optoelectronics.

基于MOTE的智能隐身无人机作战概念研究

针对未来智能作战和无人作战的需求,从任务、作战、技术和装备4个角度,提出了基于MOTE(Mission,Operation,Technique,Equipment)的作战概念描述方法。给出了MOTE概念设计框架,具体描述了智能隐身无人机的任务概念、作战概念、技术概念和装备概念,最后给出了其所涉及的关键技术。研究成果对智能隐身无人机的概念设计、工程研制和作战使用具有一定参考价值。

新疆开孔河流域地下水依赖型植被生态系统的遥感识别

在干旱-半干旱地区,识别地下水依赖型植被生态系统(GDVEs)的位置和范围,对水资源和生态环境保护至关重要。针对传统识别方法的不足,以新疆开孔河流域为研究区,探索基于遥感技术的GDVEs识别方法。选取相对干旱年为研究期,基于植被指数、土壤湿度和潜在蒸散发,利用叠加分析和自然间断点分级法,确定开孔河流域GDVEs的空间分布,利用湿地分布、河流影响带及野外实地调查数据对识别结果进行验证。结果表明:开孔河流域GDVEs较高和高潜力区主要位于博斯腾湖周围和孔雀河下游荒漠平原区,主要为湿地生态系统和荒漠河岸林植被生态系统,约占天然植被区面积的10.3%;验证表明,本文提出的GDVEs识别方法可在西北干旱内陆河流域推广。

基于轻量化生成对抗网络的遥感图像超分辨率重建

针对ESRGAN模型复杂度高、特征提取与表示性能欠佳的问题,提出了一种基于轻量化生成对抗网络(Light weight Generative Adversarial Network, LwGAN)的遥感图像超分辨率重建算法。该算法以改进残差密集模块(Improved Residual Dense Block, IRDB)为基础块构建生成网络的高阶特征提取部分,提取了丰富的多样化特征,同时建立了特征的通道及长距离位置关系,在降低模型参数量的同时提升了模型的特征提取与表示性能。通过在UC MERCED和NWPU-RESISC45数据集上的实验结果表明,与ESRGAN相比,LwGAN获取了更大的峰值信噪比和结构相似度,显著提升了遥感图像的超分辨率重建性能,可视化结果表明重建图像恢复了更多的纹理细节信息,同时模型参数量仅为原始ESRGAN的约三分之一,大幅地提高了模型的运行效率,为后续遥感图像的分析处理奠定了基础。

Ultrahigh sensitive near-infrared photodetectors based on MoTe2/germanium heterostructure

The efficient near-infrared light detection of the MoTe2/germanium(Ge)heterojunction has been demonstrated.The fabricated MoTe2/Ge van der Waals heterojunction shows excellent photoresponse performances under the illumination of a 915 nm laser.The photoresponsivity and specific detectivity can reach to 12,460 A/W and 3.3×10^12 Jones,respectively.And the photoresponse time is 5 ms.However,the MoTe2/Ge heterojunction suffers from a large reverse current at dark due to the low barrier between MoTe2 and Ge.Therefore,to reduce the reverse current,an ultrathin GeO2 layer deposited by ozone oxidation has been introduced to the MoTe2/Ge heterojunction.The reverse current of the MoTe2/GeO2/Ge heterojunction at dark was suppressed from 0.44µA/µm^2 to 0.03 nA/µm^2,being reduced by more than four orders of magnitude.The MoTe2/Ge heterojunction with the GeO2 layer also exhibits good photoresponse performances,with a high responsivity of 15.6 A/W,short response time of 5 ms,and good specific detectivity of 4.86×10^11 Jones.These properties suggest that MoTe2/Ge heterostructure is one of the promising structures for the development of high performance near-infrared photodetectors.

High energy soliton pulse generation by a magnetron-sputtering-deposition-grown MoTe_2 saturable absorber

The pulse energy in the ultrafast soliton fiber laser oscillators is usually limited by the well-known wave-breaking phenomenon owing to the absence of a desirable real saturable absorber(SA) with high power tolerance and large modulation depth. Here, we report a type of microfiber-based MoTe_2 SA fabricated by the magnetron-sputtering deposition(MSD) method. High-energy wave-breaking free soliton pulses were generated with pulse duration/pulse energy/average output power of 229 fs/2.14 nJ/57 mW in the 1.5 μm regime and 1.3 ps/13.8 nJ/212 mW in the 2 μm regime, respectively. To our knowledge, the generated soliton pulses at 1.5 μm had the shortest pulse duration and the highest output power among the reported erbium-doped fiber lasers mode locked by transition metal dichalcogenides. Moreover, this was the first demonstration of a MoTe_2-based SA in fiber lasers in the 2 μm regime, and the pulse energy/output power are the highest in the reported thulium-doped fiber lasers mode locked by two-dimensional materials. Our results suggest that a microfiber-based MoTe_2 SA could be used as an excellent photonic device for ultrafast pulse generation, and the MSD technique opens a promising route to produce a high-performance SA with high power tolerance and large modulation depth, which are beneficial for high-energy wave-breaking free pulse generation.

离子液体插层导致的MoTe2,WTe2拓扑及超导性质的双重调控

使拓扑材料具有超导电性是实现拓扑超导的一个重要途径.Td相的MoTe2和WTe2不仅具有新颖的拓扑性质,其物理特性紧密依赖于层间耦合作用的强弱.本工作通过一种新颖的实验方法,在MoTe2和WTe2单晶样品中插入离子液体的有机阳离子,制备出层间距可调、性质稳定且超导增强的有机-无机复合样品.插层后的MoTe2样品属于三维弱拓扑绝缘体,超导转变温度从0.25 K大幅提高到了7 K;而插层后WTe2的超导转变温度提高到了具有量子自旋霍尔效应的单层WTe2的2.8倍(2.3 K).本工作通过插层离子液体的有机阳离子到MoTe2和WTe2样品中,实现对其拓扑及超导性质的双层调控,为后续研究拓扑超导、实现马约拉纳零模提供了新的机遇.另外,这一新方法具有普适性,可以广泛适用于各种层状材料,这将为在层状材料中探索和实现更多新颖物理性质提供便利.

中国鲎人工繁育系列装置设计和养殖效果分析

为提高中国鲎人工繁育养殖效率,针对中国鲎人工繁殖和幼体培育过程中的养殖装置进行了优化设计、改进,并比较了新旧装置的养殖效果。结果表明:新型亲鲎暂养系统平均每只雌鲎产卵量为3530粒,显著高于常规亲鲎暂养系统(2320粒)(P<0.05),过滤桶清洗频率显著低于常规亲鲎暂养系统(P<0.05);新型幼体培育装置获得2龄幼体比率(93.33%)和3龄幼体比率(35.33%)显著高于常规幼体培育装置(2龄83.33%和3龄10.33%)(P<0.05);新型幼体培育装置1龄幼体平均死亡率(6.67%)和2龄幼体平均死亡率(6.33%)均显著低于常规幼体培育装置(16.67%和30.67%)(P<0.05);新型幼体培育装置养殖第11~12 d开始2龄蜕壳、21~30 d开始3龄蜕壳,常规幼体培育装置2、3龄蜕壳均从第31~40 d开始,新型幼体培育装置所需蜕壳时间显著降低(P<0.05)。以上结果显示,新型亲鲎暂养系统可增强水体净化能力,提高亲鲎产卵量,显著加快2龄和3龄幼鲎蜕皮速度,降低2龄幼鲎死亡率。研究结果可为后续大规模鲎人工繁育和幼体培育提供重要技术参考。

Enhancement of MoTe2 near-infrared absorption with gold hollow nanorods for photodetection

Infrared(IR)light photodetection based on two dimensional(2D)materials of proper bandgap has attracted increasing attention.However,the weak IR absorption in 2D materials,due to their ultrathin attribute and indirect bandgap in multilayer structures,degrades their performance when used as IR photodetectors.In this work,we utilize the fact that few-layer MoTe2 flake has a near-IR(NIR)bandgap and demonstrate a^60-fold enhancement of NIR response by introducing a gold hollow nanorods on the surface.Such gold hollow nanorods have distinct absorption peak located also at the NIR regime,therefore induces strong resonance,benefitting NIR absorption in MoTe2,resulting in strong near-field enhancement.With the evidence from steady and transient state optical spectra,we confirm that the enhancement of NIR response originates only photon absorption,rather than electron transport at interfaces as observed in other heterostructures,therefore,precluding the requirement of high-quality interfaces for commercial applications.

Enormous enhancement in electrical performance of few-layered MoTe2 due to Schottky barrier reduction induced by ultraviolet ozone treatment

Doping can improve the band alignment at the metal-semiconductor interface to modify the corresponding Schottky barrier,which is crucial for the realization of high-performance logic components.Here,we systematically investigated a convenient and effective method,ultraviolet ozone treatment,for p-type doping of MoTe2 field-effect transistors to enormously enhance the corresponding electrical performance.The resulted hole concentration and mobility are near 100 times enhanced to be〜1.0×10^13 cm^-2 and 101.4 cm^2/(V·s),respectively,and the conductivity is improved by 5 orders of magnitude.These values are comparable to the highest ones ever obtained via annealing doping or non-lithographic fabrication methods at room temperature.Compared with the pristine one,the photoresponsivity(522 mA/W)is enhanced approximately 100 times.Such excellent performances can be attributed to the sharply reduced Schottky barrier because of the surface charge transfer from MoTe2 to MoOx(x<3),as proved by photoemission spectroscopy.Additionally,the p-doped devices exhibit excellent stability in ambient air.Our findings show significant potential in future nanoelectronic and optoelectronic applications.

Transformation of monolayer MoS2 into multiphasic MoTe2： Chalcogen atom-exchange synthesis route

Molybdenum ditelluride （MoTe2）, which is an important transition-metal dichalcogenide, has attracted considerable interest owing to its unique properties, such as its small bandgap and large Seebeck coefficient. However, the batch production of monolayer MoTe2 has been rarely reported. In this study, we demonstrate the synthesis of large-domain （edge length exceeding 30 μm）, monolayer MoTe2 from chemical vapor deposition-grown monolayer MoS2 using a chalcogen atom-exchange synthesis route. An in-depth investigation of the tellurization process reveals that the substitution of S atoms by Te is prevalently initiated at the edges and grain boundaries of the monolayer MoS2, which differs from the homogeneous selenization of MoS2 flakes with the formation of alloyed Mo-S-Se hybrids. Moreover, we detect a large compressive strain （approximately -10%） in the transformed MoTe2 lattice, which possibly drives the phase transition from 2H to 1T＇ at the reaction temperature of 500 ℃. This phase change is substantiated by experimental facts and first-principles calculations. This work introduces a novel route for the templated synthesis of two-dimensional layered materials through atom substitutional chemistry and provides a new pathway for engineering the strain and thus the intriguing physics and chemistry.