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1.
《科技通报》2015,(3)
双色鸳鸯美人蕉是属被子植类中少见稀世珍品,研究双色鸳鸯美人蕉的套种宅配技术,提高其花期和产值。分析了单、套作条件下美人蕉的生长及产量的差异。研究了一种采用日光温室中双色鸳鸯美人蕉套种高效栽培技术。通过该栽培技术的研究和推广,对双色鸳鸯美人蕉的选种、套种栽培基质培养、播种育苗与定植管理进行了重点研究。通过对美人蕉花解离分析测定方法,进行栽培效果测定。研究得出,该方法栽培双色鸳鸯美人蕉,能有效保证双色鸳鸯美人蕉对应用基质的利用效率,提高根冠比,提高双色鸳鸯美人蕉的观赏性。可以使绿体株高和假茎高得到抑制,花冠增大,使得其观赏价值更大,外轮退化雄蕊2~3枚,花期扩大3~4月。 相似文献
2.
本研究以水蜡种子为主要试材,用温室内不同栽培基质对其进行播种育苗,将处理好的种子分别播种在4种不同基质中,观察水蜡发芽情况。试验结果表明：播种到常规园土、草炭土和沙土混合比例2：1：1基质的水蜡发芽率最高为42％,常规园土基质的水蜡发芽率最差为16％。此实验结果为水蜡在北方地区绿化中的育苗阶段提供了最佳育苗基质配方和技术保证。 相似文献
3.
通过日光温室黄瓜栽培技术实践,从品种选择、种子处理、床土消毒、温室消毒、嫁接育苗、定植后管理、病虫害防治等方面提出了庄浪县无公害黄瓜日光温室越冬茬生产技术。 相似文献
4.
本文通过对达拉特旗设立典型农业利用大棚、温室种植蔬菜的试验示范，从菜种、品种选择、育苗技术、田间栽培管理、施肥以及种植制度等方面探讨了适宜本地区的保护地蔬菜生产体系，并通过产入与产出比为中国落后农区的菜农指出了一条发展经济达到小康的出路。 相似文献
5.
采集野生羊肚菌,利用组织分离法进行纯化培养2-3次,培育出栽培菌种。在温室大棚条件下,模拟野生羊肚菌的生态习性,按照不同培养料的配比进行栽培试验,选择最佳的栽培基质和方法,为青藏高原规模化栽培羊肚菌奠定研究基础。 相似文献
6.
为了明确蚓粪复配基质在西瓜育苗及大面积生产中的应用效果,将蚓粪与不同矿物按一定比例混合,配成育苗基质和栽培基质用于西瓜的穴盘育苗与大面积生产,通过对西瓜幼苗生长表现的观测,探讨蚓粪基质在西瓜作物上的作用效果。结果表明,蚓粪复合基质的主要理化性状明显优于对照基质。采用蚓粪基质进行穴盘育苗,西瓜幼苗生长迅速、干物质积累快、壮苗指数高。连作条件下,应用蚓粪基质对首批西瓜的单果重平均提高40%以上,在非连作条件下单果产量也能提高15%～20%。 相似文献
7.
本文通过对达拉特旗设立典型农户利用大棚、温室种植蔬菜的试验示范，从菜种、品种选择、育苗技术、田间栽培管理、施肥以及种植制度等方面探讨了适宜本地区的保护地蔬菜生产体系，并通过产入与产出比为中国落后农区的菜农指出了一条发展经济达到小康的出路． 相似文献
8.
<正>景洪市双季稻区水稻种植习惯模式多年来一直是一年2熟,即早稻和晚稻。这样的种植模式只能解决温饱,经济效益低。近年来,我市农技人员为了让农民在有限的土地上产出更大的经济效益,根据得天独厚的自然条件和区域优势,在种植实践中探索创新出鲜食甜玉米—水稻—水稻一年3熟的栽培模式。栽培中,通过选用适宜的品种,合理安排种植时间,采用塘泥育苗和无公害栽培技术等措施,提高甜玉米的产量和质量,两季水稻每666.7m~2产量达1100千克,一季 相似文献
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10.
柑桔性喜温暖湿润的气候环境。采用节能日光温室栽培柑桔能避免冻害,同时,可以提高柑桔产量和品质,还能提早采收和上市。根据日本的经验,在节能温室中栽培的柑桔产量可以达到露地的2～3倍,售价也可以提高到3～4倍,所以,在节能日光温室里栽培柑桔是一项高投入、高产出的生产方式。覆盖设施与覆盖时期由于柑桔树体较大,采用节 相似文献
11.
Marjorie Armstrong-Stassen Margaret Landstrom Ramona Lumpkin 《The Information Society》1998,14(2):153-164
This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors. 相似文献
12.
A joint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology his co-workers from Norway US Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells suggesting that China's projected climate warming could decrease the pest's numbers. The study was published in Proceedings of the National Academy of Sciences on September .…… 《中国科学院院刊(英文版)》2008,22(1):6-7
Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China＇s projected climate warming could decrease the pest＇s numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007. 相似文献
13.
Caroline Haythornthwaite 《The Information Society》2001,17(3):211-226
A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction. 相似文献
14.
Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies. 相似文献
15.
Puay Tang 《The Information Society》1998,14(1):19-31
The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means. 相似文献
16.
Milton Mueller 《The Information Society》2001,17(3):151-163
Long-standing conflict between domain name registrants and trademark holders prompted the Internet Corporation for Assigned Names and Numbers (ICANN) to create a global, mandatory arbitration procedure known as the Uniform Dispute Resolution Policy (UDRP). The UDRP has been used in 2166 cases involving 3938 domain names as of 1 November 2000. The policy gives the initiator of a complaint, generally a trademark holder, the right to choose which ICANN-accredited dispute resolution service provider (RSP) will handle the case. During the preparation of the UDRP,some feared that complainant selection would lead to "forum shopping" that might bias the results. This article performs a statistical assessment of the forum-shopping thesis and finds support for it. There are statistically significant differences in the various RSPs' propensity to take away names from defendants; there are also major differences in the number of cases brought to each RSP. RSPs who take away names have the larger share of cases. The study examines other variables that might explain differences in market share, such as price, the plaintiff's nationality, or the time taken to decide a case. It finds that nationality and time also are correlated with market share. The study concludes that shopping for a favorable outcome is an important factor in the UDRP. 相似文献
17.
Prof. Raymond C.K. Chen a neuropsychologist with the CAS Institute of Psychology has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology.…… 《中国科学院院刊(英文版)》2008,22(1):15-15
Prof. Raymond C.K. Chen, a neuropsychologist with the CAS Institute of Psychology, has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology. 相似文献
18.
《中国科学院院刊(英文版)》2014,(3)
<正>In Xishuangbanna,one of China’s most biodiverse regions,landscape has changed dramatically during the past three decades due to the conversion of tropical rainforest to rubber plantations.In steep areas,terraces are often constructed before planting rubber trees,which causes two important changes in the soil:the destabilization of soil in the bench terraces and the increased vulnerability of unvegetated riser faces to erosion.Few studies have documented the nature and intensity of erosion on bench terraces.Prof.LIU Wenjie and his colleagues from the Xishuangbanna Tropical Botanical Garden(XTBG)conducted a study in Menglun County(21°5′39″N,101°15′55″E),Xishuangbanna to evaluate the influence 相似文献
19.
Chinese Scientists Use Earth Observation Technologies to Study and Protect Wild Camels 总被引：1，自引：0，他引：1
《中国科学院院刊(英文版)》2014,(3):267-268
<正>Chinese scientists plan to apply Earth Observation technologies to protect the critically endangered wild camels(Camelus ferus).With the help of remote sensing,satellite positioning,geographical information system and wireless sensors networks,they will be able to access the distribution and population of the wild camels and protect their habitats.The project will be carried out by the International Research Center for Wild Camel Conservation,which was jointly established earlier this year by the Institute of Remote Sensing and Digital Earth(RADI)of the Chinese 相似文献
20.
WANG Sijia 《中国科学院院刊(英文版)》2014,(2):192-194
<正>The Paul Gerson Unna Research Group on Dermatogenomics was founded in October 2012 at the Partner Institute for Computational Biology.The ultimate goal of the group is to understand the biology of skin and skin appendages. 相似文献