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- 清梦无痕3 2009-03-23 00:00:00
- China's seed processing machinery market opportunities revealed Seed processing machinery can not be optimistic about the status quo The development of seed processing machinery in China late 70s from a single imported from abroad, and research study and imitation. 80's from abroad seed processing complete sets of equipment, conducted a research study and imitation. The late 80's, China's seed processing machinery, research and production work from the introduction of imitation, assimilation, has entered a self-developed research and production to promote the rapid development period, seed processing machinery and equipment of the pilot studies and develop their own job from a single to unit, and then develop into a seed processing equipment. Through digestion and absorption and development of innovative, has developed a number of conditions are more suitable for our country the seeds of selected machine, drying machinery and seed processing equipment, and production has been generally applied. Domestic has successfully developed and gradually promote the use of a variety of models of the wind screen machines basic cleaning, gravity separator, tube nest eyes Featured machines, cylindrical screening-level machine, mixing machine, such as drug-coated variety of machine type, at the same time, the successful development of a variety of units and complete sets of equipment and to promote the use of more extensive. At present, these models the performance and processing capacity has been unable to meet increasing processing demands, some of which have vibration in addition to host big disadvantage of a shorter life-span, the energy consumption of similar products abroad, are 2 ~ 3 times. In addition, the vast majority of domestic seed processing machinery are prototype imitation of foreign products, its performance has been better than the prototype of imports, domestic manufacturers all imitate each other again, the advantages and disadvantages of being passed around, very few designers have to explore the characteristics of seed , according to the actual use of machinery to improve, resulting in more or less the same, there is special processing required to purchase the seeds of mechanical nowhere. Factory for sale their own products, whether the user has what kind of request, the consultative Factory received when replies are often can be applied to "maintaining the status quo", not the seeds of a precise experimental data. Such as foreign production of seed coating machine adopts computer control of drug types of quantitative ratio, easy to guarantee the quality of coating, while the domestic seed coating machine are dump-type measurement, the accuracy of low, it is difficult to guarantee the quality of coating. In addition, foreign seed of high quality, after coating the seeds will not be affected mobility, bags will not degenerate due to the increase in moisture, while high water content of domestic seed coating, seed coating film after the slow, viscous big affect the mobility of the required dry before bagging, or vulnerable to deterioration. However, foreign non-coated seed dryer, the domestic is in blank, an urgent need to develop. "Ninth Five-Year Plan" period, the country use discount loans and investment loans from the World Bank, plans to build various kinds of seed processing center 1050, half of which required processing capacity for the production of 5 tons per hour of large-scale food crop seed processing complete sets of equipment, so domestic users may not be do not flower the same equipment than the domestic price of high-7 ~ 8 times the price of imported equipment from abroad. Western developed countries, the development of seed processing equipment has been nearly a hundred years of history, equipment specification seriation, variety of goods, equipment, stable performance, reasonable structure, reliable work, the specialization of production equipment, advanced manufacturing processes, equipment, less energy consumption, adaptive strong, and seed processing equipment mechanization, a high degree of automation, equipment processing capacity to the large, mega-development, well positioned to meet the seed processing industry's development needs. If our country does not waste time developing and producing advanced and practical home-made seed processing machinery, this market will be of foreign occupation. Domestic equipment way out after nearly 20 years of efforts, China's seed processing machinery manufacturing plant has grown to more than 20, can produce 11 categories of more than 120 kinds of seed processing machinery, may be composed of 15 kinds of different forms of seed processing equipment. China's seed processing machinery key technology development units are designed and manufactured in accordance with the characteristics of the seeds, will add technology and mechanical performance requirements of a combination of seed, improve the quality of domestic equipment, and expand market share, implementation of home-made equipment. China-made equipment in terms of price than on imported equipment has obvious advantages, the price of imported equipment are made of 8 ~ 10 times, therefore, seed processing machinery such as our country can be at materials, manufacturing processes, technical performance and reliability to achieve the use of imported units or single - Machine indicators, even if the price of one times improve, the market potential is great. Country at a lot of the province invested large amounts of money for the seed processing industry, so our country a new upsurge in the development of seed processing machinery has come. Seed processing machinery in our country's development has broad prospects, it can more quickly improve the quality of seeds, seeds of the commercialization process and improve market competitiveness and increase efficiency. Improve the quality of seed processing machinery, seed processing to improve mechanical properties has become a manufacturer of new topics. Experts suggested that seed processing machinery enterprises should sum up experience, and grasp the opportunity to do a good job in the following aspects: First, to further deepen reform, set up to adapt to market economy, seed processing machinery development mechanism, so that seed processing machinery combine research with production. Two are from the country up into a number of financial funds and support to start a group of seed processing machinery, scientific research, the introduction of key technologies, the acquisition of advanced processing equipment, tooling and mold, 1 ~ 2 set up a model of modernization of production enterprises, to produce with the international advanced level of seed processing machinery. Three is to enhance awareness, strengthen management, put seed processing as an important means of seed production task. Four are to strive to improve the seed processing machinery operator ranks of professional quality. Five are necessary to regulate the flow of seed processing machinery market, the implementation of higher prices for better quality, the development of China-made equipment to avoid the introduction of blind duplicate. Organizations are to have six experienced technical staff to carry out research on imported equipment from abroad to conduct research and digestion and absorption, development of suitable conditions of our country's advanced and practical seed processing machinery, seed for our country really moving toward the international market and lay a solid foundation 中文 我国种子加工机械市场商机显露 种子加工机械现状不容乐观 我国种子加工机械发展较晚,70年代起从国外引进单机,并研学和仿制。80年代从国外引进种子加工成套设备,进行了研学和仿制。80年代后期,我国种子加工机械的科研及生产工作从引进、仿制、消化、吸收进入了自行开发研制、生产推广的快速发展时期,种子加工机械设备的试验研究和自行开发研制工作从单机到机组,再发展成种子加工成套设备。 通过消化吸收和开发创新,目前已研制出了一批比较适合我国国情的种子精选机、烘干机械和种子加工成套设备,并在生产中得到了普遍的推广应用。国内先后研制成功并逐步得到推广应用的有各种型号的风筛基本清选机、重力分选机、窝眼筒精选机、圆筒筛分级机、拌药包衣机等多种机型,同时又研制成功了多种机组和成套设备并较广泛地推广使用。 目前这些机型的性能和加工能力已满足不了日益提高的加工要求,其中部分主机除有振动大、寿命短的缺点外,能耗是国外同类产品的2~3倍。另外,国产种子加工机械绝大多数是国外样机的仿制产品,其性能已不如进口样机,国内各个生产厂家再互相模仿,优点和缺点被传来传去,很少有设计者去探索种子的特点,根据实际用途去改进机械,结果导致大同小异,有特殊加工需要的种子机械无处购置。工厂为了销售自己的产品,无论用户有什么样的要求,向工厂咨询时,得到的答复往往都是可以适用,以“不变应万变”,没有一个确切的种子实验数据。例如国外生产的种子包衣机采用电脑定量控制药种配比,包衣质量易保证,而国产种子包衣机均为翻斗式计量,精度低,包衣质量难以保证。此外,国外种衣剂质量高,包衣后的种子流动性不受影响,装袋后不会因水分增加而变质,而国产种衣剂含水量高,种子包衣后成膜慢、粘性大,影响流动性,装袋前需要干燥,否则极易变质。但国外无包衣种子干燥机,国内又处于空白,急需开发研制。 “九五”期间,国家利用贴息贷款和世界银行贷款投资,计划建设各类种子加工ZX1050个,其中半数需要加工能力为产量每小时5吨的大型粮食作物种子加工成套设备,因此国内用户不得不花比国产同类设备价格高7~8倍的价钱从国外引进设备。 西方发达国家的种子加工设备的发展已有近百年的历史,设备规格系列化,品种齐全,设备性能稳定,结构合理,工作可靠,设备生产专业化,制造工艺先进,设备耗能少,适应性强,种子加工成套设备的机械化、自动化程度高,设备的加工能力向大型化、超大型化发展,能很好地满足种子加工业的发展需要。如果我国再不抓紧时间,开发生产先进实用的国产种子加工机械,这个市场就会被外商占领。 国产设备出路何在经过近20年的努力,目前我国种子加工机械生产厂已发展到20多家,可生产11类120多种种子加工机械,可组成15种不同形式的种子加工成套设备。我国种子加工机械发展的技术关键是设计制造单位能够根据种子的特性,将机械加工艺与种子性能要求相结合,提高国产设备的质量,扩大市场占有量,实现设备的国产化。国产设备在价格上比进口设备有明显的优势,进口设备价格是国产的8~10倍,因此,我国种子加工机械如能在材质、制造工艺、技术性能和使用可靠性方面达到进口机组或单机的指标,即使价格提高1倍,其市场潜力也是很大的。 国家在很多省投入大量资金用于种子加工业,因此我国新的种子加工机械发展高潮已来临。在我国种子加工机械的发展有着广阔的前途,它能更快地提高种子质量,提高种子商品化进程和市场竞争能力,增加效益。提高种子加工机械质量,完善种子加工机械性能已成为生产厂家的新课题。 有关专家建议,种子加工机械企业应总结经验,把握机遇,做好以下几项工作:一是进一步深化改革,建立适应市场经济的种子加工机械发展机制,使种子加工机械的科研与生产相结合。二是国家应从财政上投入一批资金,支持启动一批种子加工机械的科研项目,引进关键技术,购置先进的加工设备、工装和模具,建立1~2个现代化的示范生产企业,生产出具有国际先进水平的种子加工机械。三是要提高认识,加强管理,把种子加工作为种子生产的重要手段来抓。四是要努力提高种子加工机械操作人员队伍的业务素质。五是要规范种子加工机械流通市场,实行优质优价,发展国产设备,避免盲目重复引进。六是要组织有经验的技术人员进行攻关,对从国外引进设备进行研究和消化吸收,开发适合我国国情的先进、实用的种子加工机械,为我国种子真正走向国际市场打下坚实的基础
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- 急求一篇5000字左右的与种子精选机械方面的英文文章 Z好带汉语翻译的!
2009-03-22 10:41:44
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- REAL-TIME KINEMATIC GPS Real-Time Kinematic (RTK) is Trimble Navigation's Site Surveyor System available as a standard option upgrade to Trimble's 4000 series SE and SSE receivers. The Medicine Bow National Forest uses 4000 SSE and SE rece... REAL-TIME KINEMATIC GPS Real-Time Kinematic (RTK) is Trimble Navigation's Site Surveyor System available as a standard option upgrade to Trimble's 4000 series SE and SSE receivers. The Medicine Bow National Forest uses 4000 SSE and SE receivers in it's Boundary Management program. The use of RTK enables a surveyor to determine a corner's position, establish a corner without having to make traditional corner moves or to mark and post line as quickly as the surveyor could walk, all without having to post-process the data. The surveyor using RTK can perform corner search within a meter or a couple of centimeters of the true location without the need to traverse down the line. For some survey applications traditional kinematic GPS field procedures are preferred, since many points can be observed in a short period of time with occupation times of a minute or less. However until now, kinematic surveying required post-processing before the results were available. This made field stakeout of corner positions, corner search, line marking and posting, and evaluation of coordinate accuracy in the field impossible to do using kinematic techniques (Curry et al 1993). Now, the use of RTK technology makes these impossible traditional kinematic tasks possible. What is RTK? RTK is currently carrier phase observations processed (corrected) in real-time resulting in position coordinates to a 1-2 centimeter accuracy level being available to the surveyor in the field. In other words, what the surveyor sees is what he gets. RTK, consists of two or more GPS receivers, three or more radio-modems, a "fixed-plate initializer" , and a handheld survey data collector/computer (TDC1). In RTK, one receiver occupies a known reference station and broadcasts a correction message (Compact Measurement Record or CMR2) to one or more roving receivers. The roving receivers process the information to solve the WGS-84 vectors by solving the integers in real-time within the receiver to produce an accurate position relative to the reference station. Precision of RTK is +/-2 cm + 2 ppm, with 1 ppm equating to 1 mm per 1 km (Trimble Navigation, 1993). The TDC1 is used to graphically display the processed results of the surveyors current position on the ground at that moment. The TDC1 has the capability for the surveyor to navigate within a couple of centimeters to a known or unknown coordinate position using Local, State Plane or Geographic coordinates. In real-time positions may be logged in the field, inverses performed, attributes (features) recorded, azimuths and distances between points calculated, and corners located. RTK, as with traditional kinematic GPS procedures, currently requires continuous satellite lock to be maintained. This restriction allows for RTK to be most effective in a non-canopied, no obstructions environment. 展开
2009-06-04 09:20:37
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2015-12-08 07:21:11
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- 以下是文献的一部分,愿意帮忙的高手留下邮箱,我把文件发给你,若能完成,加分:SpatialCompressiveSensingApproachForFieldDirectionalityEstimation.I.INTRODUCTIONVarietyoft... 以下是文献的一部分,愿意帮忙的高手留下邮箱,我把文件发给你,若能完成,加分: Spatial Compressive Sensing Approach For Field Directionality Estimation. I. INTRODUCTION Variety of techniques for field directionality estimation were studied in literature [1]-[5]. Thus, a theoretical analysis of the relationship between the hydrophone array output and the noise field was conducted in [1]-[5]. The developed techniques were based on the array beamformer output or the crossspectral matrix between outputs of array elements [4]-[5]. The problem of a field directionality estimation in ocean, using horizontal line towed array was also addressed in literature [5]- [8]. Recently, problems of direction of arrival and field directionality estimation for moving sensors arrays have attracted renewed interest [9]-[12]. It was shown that an array motion can improve an array performance assuming temporal coherence of successive samples [10]-[11]. In [12], the wavefield sampling method that exploits the linear relationship between the noise field and the collection of beamformer outputs over various array orientations was proposed. It was shown that the wavefield sampling (WS) method outperforms other tested methods. This algorithm was implemented via the recursive estimation method and its convergence to the unique solution was promised for a specific set of array orientations and beamformer look directions. However, a method for a proper array orientation and beamformer look direction sequence selection remains an open question. The quality of the field directionality estimation is determined by the angular resolution. The higher angular resolution is, the more accurate estimation of the far field sources, and better detection performance can be achieved. One of fundamental relations in the array signal processing is that the angular resolution is directly proportional to the number of the array elements [13]. This relation motivates the desire for longer arrays that can achieve higher resolution. Unfortunately, the requirement contradicts the implementation and installation limitations that motivate shorter arrays. Moreover, implementation of longer arrays for maneuvering platforms such as unmanned underwater vehicles (UUV) can even be impossible [14]. These contradictions motivate the quest for alternative array signal processing methods. Usually, the field directionality is modeled as a finite set of strong far-field narrow-band sources and an isotropic lowpower noise [1]. In this work, the model of the field directionality is adopted in the following way. First, the bearing angle space is uniformly sampled into a large number of discrete angles. Next, it is assumed that ether the high energy that corresponds to the far-field strong sources or the low-energy that corresponds to the isotropic noise is received at the sensor array from every of these discrete azimuth angles. 展开
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2018-11-12 14:42:29
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2009-02-21 00:33:53
437
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- 邮箱576642385@qq.com谢谢... 邮箱 576642385@qq.com 谢谢 展开
2011-04-11 00:18:44
377
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- 求英文论文一篇
- 要5000词左右,注明出处(杂志名,多少期,Z好可查),不要从书中摘录的。关于网络方面的。(软件。。不要硬件的)。。有翻译更好,没有也行。谢谢大家帮帮忙。
2009-04-12 18:26:09
296
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2018-11-29 03:21:17
334
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2014-06-07 08:58:41
431
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- 急求帮我翻译一段电力专业英语文章啊!!
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2013-06-11 09:00:02
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