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Influence of cowpea and melon populations on weed infestation and farmers’ attitude to weed control practice 豇豆和甜瓜种群对杂草侵害的影响及农民对杂草防治措施的态度
Pub Date : 2010-08-27 DOI: 10.4314/JASSA.V9I1.58606
A. Udoh
Small farmers in the humid regions of tropical Africa spend 30–42% of their total farm labour input in controlling weeds. Chemical weed control is normally recommended but high cost of herbicides and environmental pollution are specific problems with chemical weed control. A three year bio-weed control system with three populations of cowpea (20, 33, and 50 x 103 plants ha-1) and melon (5, 10 and 15 x 103 plants ha-1) in a cassava/maize intercrop was conducted to check weeds at 3, 5 and 8 weeks after planting (WAP) in the southeastern humid derived savanna and humid rainforest zones of Nigeria. Cowpea and melon populations at 50 x 103 and 15 x 103 plants ha-1 significantly reduced weed infestation in the cropping system. Since rural women constitute 50–60% of the farming population and are a significant source of labour in weeding operations then a weed control strategy with melon crop which provides oil and protein to farm families may be highly innovating to them. One hundred women farmers were invited to visit the research extension plot at 3, 5 and 8 WAP, before weeding. At 5 WAP, 80% of the farmers and at 8 WAP, 100% of them preferred to adopt 50 x 103 cowpea with 15 x 103 melon plants ha-1 since this combination gave the most effective weed control. Cassava grown as sole crop produced higher root yield ha-1 than when grown with maize, cowpea and melon in the three years and at both locations. Grain yield of maize was significantly depressed in the intercrop system. Cowpea grain yield increased with increase in population, but the increase per unit change in population was much higher in sole cowpea. Similarly, seed yield of melon increased significantly with increase in its population in intercropped and sole cropped melon. The highest net incomes of N83,540, N138,350 and N158,530 for 1989, 1990 and 1991 at Ogoja location and N134,000, N255,590 and N289,240 at Uyo for the respective years were obtained from a four-crop combination of 50 x 103 cowpea and 15 x 103 melon populations and with cassava and maize at 10 x 103 and 20 x 103 plants ha-1. Though sole crop of melon at 50 x 103 ha-1 gave a higher and significant seed yield, it was not profitable and sustainable to small-holder resource poor farmers. Keywords: Cowpea, melon, weed control, economic analysis, farmers’ attitude
热带非洲潮湿地区的小农将其全部农业劳动投入的30-42%用于控制杂草。化学除草通常被推荐,但化学除草的具体问题是除草剂成本高和环境污染。在尼日利亚东南部湿润热带稀树草原和湿润雨林地区,采用3个木薯/玉米间作群体豇豆(20、33和50 × 103株hm -1)和甜瓜(5、10和15 × 103株hm -1),在种植后3、5和8周进行了为期3年的生物杂草防治系统。50 × 103和15 × 103株ha-1的豇豆和甜瓜种群显著减少了种植系统中的杂草侵扰。由于农村妇女占农业人口的50-60%,是除草作业的重要劳动力来源,因此,利用为农民家庭提供油和蛋白质的瓜类作物控制杂草的战略对她们来说可能是高度创新的。在除草前,100名女性农民被邀请在WAP 3、5和8点参观研究推广地块。在5 WAP时,80%的农民和在8 WAP时,100%的农民倾向于采用50 × 103株豇豆和15 × 103株甜瓜的组合,因为这种组合可以最有效地控制杂草。在这两个地点,作为单独作物种植的木薯在三年内比与玉米、豇豆和甜瓜一起种植的根产量更高。间作制度显著降低玉米产量。豇豆籽粒产量随种群数量的增加而增加,但单豇豆的单位种群变化增加幅度要大得多。间作和单作甜瓜的种子产量也随着种群的增加而显著增加。1989年、1990年和1991年,小谷加地区的净收入最高,分别为83,540、138,350和158,530奈拉,尤约地区的净收入最高,分别为134,000、255,590和289,240奈拉,这些净收入来自于四种作物组合,分别为50 × 103豇豆和15 × 103甜瓜,木薯和玉米分别为10 × 103和20 × 103株/公顷。虽然50 × 103公顷-1的甜瓜单作种子产量较高且显著,但对资源贫乏的小农来说,这是不盈利和可持续的。关键词:豇豆、甜瓜、杂草防治、经济分析、农民态度
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引用次数: 1
Rangelands in Zimbabwe’s initial resettlement schemes: Spatial and temporal change analyses 津巴布韦初始安置计划中的牧场:时空变化分析
Pub Date : 2010-08-27 DOI: 10.4314/JASSA.V9I1.58605
T. Chinuwo, P. Mugabe, I. Mpofu, S. Makuza
Change in size and extent of cultivation and vegetation cover was analysed in three villages of an initial resettlement scheme in Zimbabwe using change detection depicted on serial aerial photographs taken at eight-year intervals from inception in 1981 to 1997. A geographic information system was used as an analytical tool. Interpretations were done using aerial photographs and 1995 Spot Images. The spot images were geo-referenced to Universal Transverse Mercator (UTM) coordinate system to ensure continuity of features. All images were enhanced using TNTmips to come up with clearer images. Aerial photographs for the three selected villages were scanned and geo-referenced and then exported to ARC VIEW 3.2 for on-screen digitising of land parcels as cultivated and vegetation theme layers. Overlay and spatial analysis were also done in ARC VIEW 3.2 for change detection. Results showed an average increase in size of cultivated areas by 281% between 1981 and 1997 and a increase of 52% between 1989 and 1997 in the three villages. Rangelands declined by a mean 42% during 1981 and 1997. There was a shift in land-use in 1987/8, which exaggerated cultivated areas due to fuzzy classification of land reverting to grazing areas by 1989. This shift in cultivation sites was adequately captured on overlaid aerial photographs for each of the three villages. It was concluded that spatial and temporal changes occurred in resettlement schemes rangelands and were due to the actions of resettled farmers. Keywords: Resettlement schemes, change detection, spatial analysis.
利用从1981年至1997年开始每隔8年拍摄的连续航空照片所显示的变化,分析了津巴布韦初步安置计划的三个村庄的种植面积和范围以及植被覆盖的变化。使用地理信息系统作为分析工具。解译使用航空照片和1995年现场图像。斑点图像以通用横墨卡托(Universal Transverse Mercator, UTM)坐标系为基准,以保证特征的连续性。所有图像都使用TNTmips增强,以获得更清晰的图像。对选定的三个村庄的航拍照片进行扫描和地理参考,然后导出到ARC VIEW 3.2,以在屏幕上将地块数字化为耕地和植被主题层。为了检测变化,还在ARC VIEW 3.2中进行了覆盖和空间分析。结果表明:1981 - 1997年,3个村的耕地面积平均增加了281%,1989 - 1997年平均增加了52%。1981年至1997年间,牧场面积平均减少了42%。1987/8年土地利用发生了变化,由于1989年土地归牧分类模糊,耕地面积被夸大。这三个村庄的重叠航拍照片充分记录了种植地点的变化。得出的结论是,重新安置计划和牧场的空间和时间变化是由重新安置的农民的行动造成的。关键词:移民安置方案,变化检测,空间分析
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引用次数: 1
Use of parametric and non-parametric survival analysis techniques to evaluate the effectiveness of two acaricides in controlling tsetse flies. ( Diptera Glossinidae ). 采用参数和非参数生存分析技术评价两种杀螨剂防治采采蝇的效果。(双翅目舌蝇科)
Pub Date : 2010-08-27 DOI: 10.4314/JASSA.V9I1.58604
T. Munyombwe, I. Mdala, C. Mangwiro
This paper presents parametric and non-parametric survival analysis procedures that can be used to compare acaricides. The effectiveness of Delta Tick Pour On and Delta Tick Spray in knocking down tsetse flies were determined. The two formulations were supplied by Chemplex. The comparison was based on data collected from trials carried out in Zimbabwe at Rukomichi Research Station in 2003. Rukomichi Research Station is owned by the Department of Veterinary Services and is mainly used for conducting research on tsetse flies. The Kaplan Meier estimate of survivor and hazard function was used as the non-parametric procedure for comparing survival times of tsetse exposed to Delta Tick Spray and Delta Tick Pour On. In addition the log rank statistic was also used to explore the differences between the two formulations. The parametric procedure assumed that the survival times follow a lognormal distribution after checking the suitability of the distribution and estimating the hazard, survivor function and quartiles assuming the distribution. A proportional hazard model was also fitted to compare the two formulations. The non-parametric procedure revealed that the median survival times of tsetse exposed to Delta Tick Pour On was 10 minutes compared to 12 minutes for those exposed to Delta Tick Spray. The parametric procedure showed that the median survival time of tsetse exposed to Delta Tick Pour On was 10.59 minutes compared to 13.70 for those exposed to Delta Tick Spray. The proportional hazards model indicated that the hazard of being knocked down is 1.335 more for tsetse exposed to Delta Tick Pour On than those on Delta Tick Spray (p
本文提出了参数和非参数生存分析程序,可用于比较杀螨剂。测定了喷淋和喷淋两种药剂杀灭采采蝇的效果。这两种配方由Chemplex提供。这一比较是基于2003年在津巴布韦Rukomichi研究站进行的试验收集的数据。Rukomichi研究站隶属于兽医厅,主要用于采采蝇的研究。Kaplan Meier估计存活和危险函数被用作非参数程序来比较暴露于Delta Tick Spray和Delta Tick Pour的采采蝇的存活时间。此外,还使用日志等级统计来探讨两种公式之间的差异。参数化程序在检验了分布的适宜性并估计了假设分布的风险、生存函数和四分位数后,假设生存时间服从对数正态分布。还拟合了一个比例风险模型来比较两种公式。非参数程序显示,暴露于Delta Tick Pour On的采采蝇的中位存活时间为10分钟,而暴露于Delta Tick Spray的采采蝇的中位存活时间为12分钟。参数化处理结果表明,喷淋采采蝇的中位生存时间为10.59分钟,喷淋采采蝇的中位生存时间为13.70分钟。比例风险模型表明,喷淋采采蝇被击倒的风险比喷淋采采蝇被击倒的风险高1.335倍(p
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引用次数: 0
Behavioral Basis of the Financial Crisis 金融危机的行为基础
Pub Date : 2010-08-03 DOI: 10.1002/9781118266588.CH35
Joseph V. Rizzi
Financial institutions suffered large losses following the collapse of the credit markets despite making huge risk management investments. Major risks are frequently ignored due to behavioral biases resulting in incorrect decisions. These biases are reinforced by organizational obstacles, such as misaligned compensation systems. This article outlines a supplemental behavioral risk framework, and applies it to the structure finance market. Behavioral finance can improve how risk decisions are made. You ignore behavioral risk at your peril.
金融机构尽管进行了巨额风险管理投资,但在信贷市场崩溃后遭受了巨大损失。由于行为偏差导致错误决策,主要风险经常被忽略。这些偏见会因组织障碍而加强,比如不协调的薪酬体系。本文概述了一个补充的行为风险框架,并将其应用于结构融资市场。行为金融学可以改善风险决策的制定。你忽视了行为风险,后果自负。
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引用次数: 30
Why SPAC Investors Should Listen to the Market 为什么SPAC投资者应该听从市场
Pub Date : 2009-02-12 DOI: 10.2139/ssrn.1341771
T. Jenkinson, M. Sousa
Special purpose acquisition companies (SPACs) have raised around $22bn from investors since 2003, and comprised 20% of total funds raised in US IPOs in 2007. SPACs are interesting structures - allowing investors a risk-free option to invest in a future acquisition. However, we show that more than one-half of approved deals immediately destroy value. Investors, who can observe the market's view of the proposed deal, as well as that of the founders, should listen to the market, since the extreme incentives faced by the SPAC founders create corresponding conflicts of interest. We propose a simple, observable rule - based on market prices - which investors should heed.
自2003年以来,特殊目的收购公司(spac)已从投资者那里筹集了约220亿美元,占2007年美国ipo融资总额的20%。SPACs是一种有趣的结构——允许投资者无风险地选择投资于未来的收购。然而,我们表明,超过一半的批准交易立即破坏价值。投资者可以观察市场对拟议交易的看法,以及创始人的看法,他们应该倾听市场的声音,因为SPAC创始人面临的极端激励会产生相应的利益冲突。我们提出一个简单、可观察的规则——基于市场价格——投资者应该注意。
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引用次数: 20
Momentum and Contrarian Stock-Market Indices 动量和反向股票市场指数
Pub Date : 2008-04-22 DOI: 10.2139/SSRN.1310286
Jon Edward Eggins, R. Hill
We propose a new class of investable momentum and contrarian stock-market indices that partition a benchmark index, such as the Russell 1000. Our momentum indices overweight stocks that have recently outperformed, while our contrarian indices underweight these same stocks. Our index construction methodology is extremely flexible, and allows the index provider to trade-off the distinctiveness of the momentum/contrarian strategies with portfolio turnover. Momentum investment styles in particular typically entail a high level of turnover, and hence high associated transaction costs. The creation of momentum and contrarian indices and exchange traded funds (ETFs) based on our methodology would allow investors to access these styles at lower cost than is currently possible. Our indices also provide performance benchmarks for momentum/contrarian investment managers, and good proxies for a momentum factor. Over the period 1995- 2007 we find that short term momentum and long term contrarian indices outperform the reference Russell 1000 index. We also document the changing interaction between the momentum/contrarian and value/growth styles.
我们提出了一类新的可投资动量和反向股票市场指数,分割基准指数,如罗素1000。我们的动量指数加持近期表现优异的股票,而我们的反向指数减持这些股票。我们的指数构建方法非常灵活,允许指数提供者在动量/反向策略的独特性与投资组合周转率之间进行权衡。动量投资风格尤其需要高水平的周转率,因此相关的交易成本也很高。基于我们的方法创建动量和反向指数以及交易所交易基金(etf),将使投资者能够以比目前更低的成本获得这些风格。我们的指数还为动量/反向投资经理提供了业绩基准,并很好地代表了动量因素。在1995年至2007年期间,我们发现短期动量指数和长期反向指数的表现优于参考罗素1000指数。我们还记录了动量/反向和价值/增长风格之间不断变化的相互作用。
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引用次数: 15
Evidence of Motives and Market Reactions to Sale and Leasebacks 售后回租的动机和市场反应的证据
Pub Date : 2007-12-01 DOI: 10.2139/ssrn.1081461
Kyle S. Wells
In this paper I find systematic differences between firms using sale-and-leaseback transactions in comparison to industry averages. I find evidence supporting the primary theoretical reason for leasing, namely taxes and mixed support for asymmetric information costs and bankruptcy costs relating to leasing. Contrary to theory, I find that these firms are typically large and solvent with high growth potential but have low interest coverage and high leverage suggesting that the need for cash in tandem with capital constraints are driving these transactions. Controlling for credit constraints, I find abnormal market returns are positively correlated with P/E and negatively correlated with debt structure suggesting that the market perceives sale-and-leaseback funds likely to be used for growth as value enhancing while firms likely to use funds to meet debt obligation experience lower event returns.
在本文中,我发现与行业平均水平相比,使用售后回租交易的公司之间存在系统性差异。我找到了支持租赁的主要理论原因的证据,即税收和对与租赁相关的不对称信息成本和破产成本的混合支持。与理论相反,我发现这些公司通常规模大,有偿付能力,具有高增长潜力,但利息覆盖率低,杠杆率高,这表明对现金的需求以及资本约束正在推动这些交易。在控制信贷约束的情况下,我发现异常的市场回报与市盈率正相关,与债务结构负相关,这表明市场认为可能用于增长的售后回租资金是增值的,而可能使用资金来偿还债务的公司则会经历较低的事件回报。
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引用次数: 17
Ergonomic evaluation of manually-operated peanut butter mills 手动花生酱磨机的人机工程学评价
Pub Date : 2005-02-11 DOI: 10.4314/JASSA.V8I2.16925
N. Mhazo, E. Nyakudya, RM Nazare, BM Mvumi
No Abstract Available JASSA: Journal of Applied Science in Southern Africa Vol.8(2) 2002: 76-88
南方非洲应用科学学报,Vol.8(2) 2002: 76-88
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引用次数: 1
Cloning, sequencing and expression of an endo-β-1,4-glucanase gene of a Bacillus subtilis CHZ1 枯草芽孢杆菌CHZ1内切β-1,4-葡聚糖酶基因的克隆、测序和表达
Pub Date : 2005-02-11 DOI: 10.4314/JASSA.V8I2.16924
C. Zvidzai, I. Sithole-Niang, R. Zvauya, R. Hatti-Kaul, O. Delgado
No Abstract Available JASSA: Journal of Applied Science in Southern Africa Vol.8(2) 2002:65-75
《南方非洲应用科学》Vol.8(2) 2002:65-75
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引用次数: 3
The battles occurring within the animal body: Will they ever end? 发生在动物体内的战斗:它们会结束吗?
Pub Date : 2005-02-11 DOI: 10.4314/JASSA.V8I2.16928
M. Obwolo
No Abstract Available JASSA: Journal of Applied Science in Southern Africa Vol.8(2) 2002: 111-115
中国农业大学学报(自然科学版),2002年第1期,第2期
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引用次数: 0
期刊
JASSA-The Finsia Journal of Applied Finance
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