利用航空护林飞机进行机载图像传输试验

借助航空护林通用飞机,利用最新研发的WTXC-1型机载林火监测无线传输系统,探索性地开展了为可视化扑火指挥提供林火图像的应用试验,结果表明,航高在300～1900m、距离在5～80km范围内,可实时、清晰、稳定可靠地传输林火监测图像。一般来说,航高越高,传输效果越好,但传输距离超过80km以后,图像传输开始出现中断和延时传输现象;话音传输距离优于图像传输距离。     

Status and habitat associations of the threatened northern abalone: importance of kelp and coralline algae

相似文献   

Screening Tests for the Rapid Detection of Diarrhetic Shellfish Toxins in Washington State

The illness of three people due to diarrhetic shellfish poisoning (DSP) following their ingestion of recreationally harvested mussels from Sequim Bay State Park in the summer of 2011, resulted in intensified monitoring for diarrhetic shellfish toxins (DSTs) in Washington State. Rapid testing at remote sites was proposed as a means to provide early warning of DST events in order to protect human health and allow growers to test “pre-harvest” shellfish samples, thereby preventing harvest of toxic product that would later be destroyed or recalled. Tissue homogenates from several shellfish species collected from two sites in Sequim Bay, WA in the summer 2012, as well as other sites throughout Puget Sound, were analyzed using three rapid screening methods: a lateral flow antibody-based test strip (Jellett Rapid Test), an enzyme-linked immunosorbent assay (ELISA) and a protein phosphatase 2A inhibition assay (PP2A). The results were compared to the standard regulatory method of liquid chromatography coupled with tandem mass spectroscopy (LC-MS/MS). The Jellett Rapid Test for DSP gave an unacceptable number of false negatives due to incomplete extraction of DSTs using the manufacturer’s recommended method while the ELISA antibody had low cross-reactivity with dinophysistoxin-1, the major toxin isomer in shellfish from the region. The PP2A test showed the greatest promise as a screening tool for Washington State shellfish harvesters.     

A methodological approach to understanding the wellbeing and restorative benefits associated with greenspace

This paper argues that research into the wellbeing and restorative effects of green spaces has been conducted in what might be described as a modal vacuum. Whilst it is commonly recognised that the outdoor world is one in which our visual, aural, haptic and olfactory senses are engaged, much environmental psychological research into this topic has been conducted using the visual sense only. We present a methodological overview of research that has been conducted either in situ or in conjunction with other modes (primarily aural), and highlight research findings from other disciplines that contributes to our understanding of greenspace wellbeing benefits. Lastly, we outline a research approach that we believe could uncover some of the underlying mechanisms of wellbeing benefits from greenspace. We contend that the use of eyetracking, in conjunction with the presentation of sound as well as visual stimuli, could help unpick the complexities of what exactly it is about certain environments that makes them restorative or not.     

Suspension feeding and growth of ark shell <Emphasis Type="Italic">Anadara granosa</Emphasis>: comparison with ubiquitous species <Emphasis Type="Italic">Scapharca subcrenata</Emphasis>

The ark shell Anadara granosa is a species peculiar to the Ariake Sound. To determine why distribution of A. granosa in Japan is largely confined to this area, we examined feeding and growth of A. granosa as functions of environmental and biological variables. The results were compared with those of another ark shell Scapharca subcrenata, which is ubiquitous in Japan. Feeding experiments indicated that A. granosa is eurythermal and euryhaline, as is S. subcrenata, but is adapted to temperature slightly higher than S. subcrenata. Weight-specific clearance rate (CR) of A. granosa as a function of soft-body dry-weight (w) followed the power function of w (CR=2.7×w ^−0.37), with coefficient and exponent very close to those for S. subcrenata. Growth rate of A. granosa increased linearly with daily ration, similar to S. subcrenata. Thus, feeding and growth characteristics of A. granosa were comparable to those of S. subcrenata and no ‘peculiarities’ of the former were detected. Therefore, the factors that make A. granosa a species restricted to the sound are probably not directly related to feeding or growth characteristics.     

Vibrational properties of wood plastic plywood

Wood plastic plywood (WPPW), composed of veneer and styrofoam, was manufactured without special adhesives such as urea–formaldehyde or phenol–formaldehyde resins, and its vibrational properties were investigated. WPPW can be produced at 1MPa and 160°C for 9min (three-ply) and 12min (five-ply). The dynamic Youngs modulus reached its highest value when the styrofoam thickness was 30mm. The sound velocity and dynamic Youngs modulus had minimum values at a grain angle of 45°. The results for dynamic Youngs moduli measured by a longitudinal vibration method and an in-plane flexural vibration method were almost the same. Dynamic shear moduli were measured by an in-plane surface wave propagation test and an in-plane flexural vibration method. From the experimental results, the dynamic shear moduli at 0° and 90° by the two methods were relatively close, although the surface wave propagation test results were higher than those from the flexural vibration method. Dynamic shear moduli at a grain angle of 45° measured by the in-plane surface wave propagation test and calculated from theory were relatively close. The surface wave propagation test results were smaller than the results calculated from theory. The shear stress distribution factors were about 1.000–1.189 for WPPW.     

基于声强和小波包分析的汽车发动机燃爆信息特征提取研究

针对发动机燃爆信息的非平稳性,利用声强近场测量和小波包多分辨率分析的特点,提出了一种基于小波包分析的声强算法,本文利用该方法对某型号发动机燃爆信息的特征提取进行了实验研究。实验结果表明,该方法可以从复杂的发动机缸盖辐射噪声中提取出燃爆信息,所提取的燃爆信息可作为发动机单缸失火的故障诊断指标。本文所提出的基于小波包分析的声强算法为汽车发动机运行状态的在线监测和故障诊断提供了一种有效的手段。     

变速器噪声在线评价的振动检测方法研究

对车辆变速器噪声是否超标的出厂质量检测．目前常采用声级计测量声压级的方法。由于该方法测得的声压级受背景噪声的影响。故只能在消声室中进行。为实现生产现场的在线测量，给出了相关推导公式。提出了声压级的振动检测方法，即通过测得变速器箱体的振动加速度信号获得其在线噪声声压级的测量方法，该方法有效地避免了背景噪声的影响。实践证明，该方法使变速器噪声出厂检测更为便捷、有效，有助于提高变速器的出厂质量，从而有效地改善车辆的性能。     

日本改善住宅楼板隔音的研究进展

随着人们生活水平的提高，对居住环境隔音性能也提出了越来越高的要求。近年来日本在改善住宅隔音性能方面的研究非常活跃，并取得了很大进展。本文仅就其中关于改善较难隔绝的楼板撞击声性能方面的研究作简要介绍。我国国情虽然与日本不同，但其研究成果对于改善混凝土住宅的隔音性能也有一定参考价值。     

STUDY ON AMBIENT NOISE IN SAWMILL'S WORKSHOP

INTRoDUCTIONTheproblemofseverenoiseiscommoninthetradeofsawmill'andishighlightedbycountriesworldwide.Sincel96os,noisehasbeeninvestigatedinasPectsofsource,absor-bance,insulationandsoonindeveIoPedcon-tries.Whenitcomestothel97os,Peoplebe-.gantoresearchtheeffectofnoiseonhuman'sphysiology,psychol6gyandworkefficiency;Resultsofinvestigationsshowthatthemaindamagesofambientnoiseinthetradeofsaw-millaretl1ehurtofhearing,theobsimctionoflanguageconuntmicationandthedecreaseofproductiveefficienCy.Inves…