Radar detection of drones responding to honeybee queen pheromone

The response of honey bee (Apis mellifera L.) drones to queen pheromone(s) (either natural from a mated queen, or synthetic from a lure) was recorded using an X-band, ground-based radar. The distribution of drones (insect targets on the radar screen) changed from a scattered distribution to a line concentration (downwind) when the pheromone was released. Displacement within the line concentration was toward the pheromone. This response was seen as far as 800±15 m downwind from a lure with 10 mg of synthetic 9-oxodec-trans-2-enoic acid (9-ODA) and as far as 420±15 m from a mated queen. These studies demonstrate that queen pheromone can be detected by drones at much greater distances than previously believed and illustrate how X-band radar may be used to establish the distances at which insects of similar or larger size respond to pheromones.Mention of a commercial or proprietary product does not constitute an endorsement by the USDA.     

The trail of perfumes

A methodology is proposed for modeling the diffusion of fragrances released from a moving source. First, we started with a one‐dimensional model considering molecular diffusion of α‐pinene in air as the only mass transport mechanism. The validation was performed in a diffusion tube, and a system was developed to move the scented source along the axial direction. Results showed that experimental data fitted well with the numerical simulation, suggesting this model as a valid tool to describe the trail of a fragrance released from a moving source for low Re of the order of 10. In the case of a person walking at the speed of 1.34 m/s in a room or corridor inside a building, three‐dimensional models are required and mass transport of the perfume to the surrounding air will be dominated by turbulent diffusion or eddy diffusion D_t which is two orders of magnitude higher than molecular diffusion. © 2018 American Institute of Chemical Engineers AIChE J, 64: 2890–2897, 2018     

Behavioral bioassays of termite trail pheromones

The monocyclic 14-membered ring diterpene, cembrene-A, previously identified as a nasutitermitine trail pheromone, was tested for its effectiveness as a trail pheromone inNasutitermes costalis. Artificial trails prepared from serial dilutions of racemic cembrene-A over a concentration range of 10^–1–10^–6 mg/ml were ineffective in recruiting termites. Serial dilutions of racemic cembrene-A ranging in concentration from 10^–1 to 10^–5 mg/ml produced an orientation effect. Chiral cembrene-A produced recruitment in soldiers at 10^–1 and 10^–3 mg/ml and was less ineffective in recruiting workers. Soldiers always showed a lower and more variable recruitment response to chiral cembrene-A than to sternal gland extracts. The behavioral response to both chiral and racemic cembrene-A was different in quantity and quality from that observed for sternal gland extract. Based on the results of these behavioral tests, cembrene-A appears to be a generalized nasute orientation pheromone which may show recruitment properties at unnaturally high concentrations.     

发电机内冷水系统的化学清洗

论述了发电机内冷水系统结垢的原因和进行化学清洗的依据，并介绍了实施化学清洗的系统和工艺     

高透明日用细瓷的研制

本文分析了影响瓷胎半透明度的几种原因,并针对性地提出了提高瓷胎半透明度的具体方法。     

粉末涂料的相关标准

简要介绍了粉末涂料的性能及常用测试方法标准、粉末涂料现行的相关标准及RoHS指令。     

Isolation of the trail recruitment pheromone ofSolenopsis invicta

TheSolenopsis invicta trail pheromone is synthesized by the Dufour's gland and is released through the sting apparatus. The recruitment subcategory of theS. invicta trail pheromone was shown to be composed of a mixture of the orientation pheromone, (Z,E)--farnesene and an unidentified homosesquiterpene consisting of three rings and one double bond (C-1). C-1 is present in worker Dufour's glands at only 75 pg per worker equivalent. This is the first report that demonstrates that different exocrine products from the same gland control different subcategories of behavior related to mass recruitment.     

粉末喷涂故障处理

1前言 粉末涂料与其他涂料一样,在施涂过程中不可避免会出现一些故障.首先要分析涂层缺陷的原因,从而能够有效蒂处理故障. 2影响涂层质量的因素 2.1粉末涂料质量差 (1)原材料不合格 粉末涂料质量问题容易造成涂层各种缺陷.须从涂料质量抓起,选择质量好的涂料,检验各项技术指标.     

开创特种化学品经营道路的赫克力士公司

赫克力士股份有限公司（ＨｅｒｃｕｌｅｓＩｎｃｏｒｐｏｒａｔｅｄＣｏ．）是美国一家有８５年历史、分布于全球４５座工厂的大中型化工企业。它以经营多种特种高分子化学品为特色。公司的产品从炸药扩展到松脂制品、火箭燃料、化学纤维素、聚烯烃石油化学产品、高分子化...     

及时利用过喷粉末的涂装装置

对比了典型进口及国产粉末喷涂设备对过喷粉末的利用情况，介绍了一种获得实用新型专利权的涂装装置。该装置综合了进口及国产设备的优点，具有很高的性价比。     

煤气发生炉水夹套产生缺陷的原因及对策

对煤气发生炉水夹套的缺陷及使用中易出现的问题进行了分析 ,并提出了相应的对策。     

乙炔发生器液位测量方式的优化

液位测量不准、不稳定是乙炔发生器常见的仪表故障,严重影响乙炔发生器的正常运行.为此在原有的双法兰差压变送器测量液位的基础上对冲水装置、取压法兰等进行了优化改造,液位仪表故障从每月8～12次降至3次以下.     

乙炔发生器加料密封阀的改造

介绍了乙炔发生器加料密封阀的改造原理及措施。改造后电石消耗减少,近6年来从未发生过乙炔发生器着火爆炸事故。     

乙炔发生温度控制改造

在电石法生产PVC工艺中,乙炔生产最主要的工艺控制指标是乙炔发生温度,为稳定发生温度,将乙炔发生温度由手控改为自控,不但温度稳定,降低工人的劳动强度,而且取得了显著的经济效益。     

目视检查--用于检查蒸汽发生器的清洗效果

介绍了大亚湾和秦山一期核电站蒸汽发生器清洗前、后的目视检查。人工操作的光纤探头具有一定检查能力,能检查管板区域的管问、中间管廊和环形区域。上部管束区的目视检查有二种技术,一种是支撑板检查装置(SID)通过手孔进行安装,用垂直输送系统经流水槽进入管廊区,它的捡查仅限于热侧和冷侧的邻近一、二、三排管束。另一种检查技术为上部管束检查装（UBIB),安装和使用与SID类似。但它是用安装在可伸缩装置上的高分辨率CCD摄像头,与支撑板上下表面保持一定距离,在管子各列之间移动。     

电站锅炉点火等离子发生器的设计

介绍等离子发生器的工作原理及设计.结合电站锅炉点火时等离子发生器的工作条件,研制出一种性能稳定、寿命长、结构简单、绝缘性好的等离子发生器.     

一氯化苯生产中氯化尾气的处理方法

介绍了氯苯车间氯化尾气N2种处理方法，对绝热吸收碱洗法和综合吸收法进行了技术评估。     

Solar Dryer for Powder Drying

A natural circulation solar dryer for drying products in the form of powder has been developed. It is of modular design and aperture area of one module is 3.34 m². A new concept of moveable glazing has been introduced for ease in loading and unloading. Air entering the dryer moves in a zig-zag path as it flows over the product and under each tray before leaving from the top. There is a provision to dry the product under shade. Also, the dryer can be dismantled and stored in a room during off-season. The dryer was tested to dry Di-calcium phosphate (DCP) at Ludhiana (31°N). The average drying efficiency for a batch was found to be 54.0%. The cost of drying DCP using this solar dryer was 0.56 Rupees per kg of dried DCP as compared to 1.94 Rupees per kg of dried DCP for a wood-fueled industrial dryer. In comparison to a solar tunnel dryer for DCP drying, the initial investment per kilogram of the dried DCP, floor area per kilogram of wet DCP, and cost of drying per kilogram of dried DCP for this dryer was reduced by 7.1%, 67.2%, and 16.4% respectively.     

热塑性粉末涂料用树脂

介绍了热塑性粉末涂料用树脂的种类和性能。