高炉煤气全干法除尘技术在首秦的应用

高炉煤气全干法除尘工艺是一种节能、环保的新型高炉煤气除尘工艺。经该工艺处理的高炉煤气含尘量少、温度高,可大幅增加余压煤气发电量,且处理过程不消耗水,显著降低了对环境的污染。从高炉煤气除尘技术的研究及应用状况出发,借鉴该技术在小型高炉上应用的成功经验,对其在大型高炉上的应用做了分析研究。目前该技术已在首秦成功应用。     

唐宋至清末土地流转制度的正负效应分析

唐宋以后,我国封建社会相对完全自由的土地私有制度开始确立.国家在制度层面上不断明晰产权,使土地的所有权、使用权等进入市场,土地流转速率加快.土地流转制度一方面可以增进社会福利、优化资源配置、调节宏观经济,并能起到融通资金的作用;另一方面由于我国诸子均分的财产继承制度和其他历史因素的影响,土地流转制度使土地趋于零散化、分配平均化,形成了我国农业小规模经营和过密化生产方式,导致社会经济发展缓慢.     

汉宜高速铁路路基石灰改良土填筑施工的质量控制

为满足列车高速运行时路基强度、变形以及路基工后沉降的要求,在缺乏优质填料的情况下,新建武汉至宜昌高速铁路路基回填采用石灰改良土来改善土的结构,提高承载力,以满足工程需要,并降低成本,缩短工期,取得较好的经济效益。本文就土料料源、石灰质量、灰剂量、含水量四方面以及现场施工工艺来分析石灰改良土的施工质量控制要点。     

Persistence of small-scale,family farms in India: A note

Abstract

The paper analyses the proliferation of small scale family farms in India. It contends that widespread involuntary unemployment in the rural economy is the chief reason for this phenomenon. The problem can be considered as that of coordination failure. The paper attempts to show that such a problem can be overcome through planned, investment promotion by the state, which by reducing unemployment induces the entry of capitalist farmers.     

An explanation of share tenancy in terms of unemployment,social norms and power

Due to persistent unemployment, peasant families in developing countries tend to employ more labour on the leased in land plots than a capitalist would. In labour surplus societies, therefore, landlords may earn higher surplus from leasing out land than from self-cultivation. By endogenising disguised unemployment this paper shows that greater power and unity of landlords and conservative social norms may explain the persistence of share tenancy in developing economies.     

Chili Growers' Experience with Contract Farming in Malaysia

The objectives of the study were (a) to examine the perception of chili growers toward contract farming (CF) and (b) to ascertain the factors that motivate the growers to participate in CF. A total of 190 chili growers within East Coast Economic Region (ECER) were interviewed. The data were analyzed using SPSS to describe the respondents' profile and CF practices. At the present moment, the chili growers have a contract agreement with the Farmers' Organization Authority of Malaysia (FOAM) and FOAM, in turn, has a contract agreement with Nestle. Factor analysis was carried out to identify latent factors that influenced chili growers in their participation in CF. These factors are extension services, access to new markets, market assurance, protection for growers, skills transfer, and indirect benefits.     

Economic Meltdown in Malaysia

Abstract

The economic downturn in Malaysia has encouraged a debate on the benefits of its export-oriented industrialisation strategy. There is renewed interest in the agricultural and livestock sectors. One of the beneficiaries of this policy change could be the dairy farming sector. Using desktop research and ‘key-informant’ techniques, this study reviews various factors that could influence the development of the dairy farming sector in Malaysia. The study concludes that the (a) Government may encourage the start-up of integrated plantation crop, animal feed and livestock farms, (b) investment and trade linkages with neighbouring countries could lead to diversification of import sources, and (c) consumption of dairy products may have matured, leading to increases in dairy self-sufficiency. It is postulated that these developments will produce a dynamic environment and significant threats to the interests of traditional dairy exporting countries.     

Characterisation and Diagnosis of Rural—Urban Interface Farming in the Tu Liem and Thanh Tri Districts of Hanoi City,Vietnam

A research project was carried out in two areas in the outskirts of Hanoi city using a combination of qualitative and quantitative methods. The objective was to study interactions among the vegetable farming systems and the peri-urban context within which they are situated. The farms studied were characterised as small-scale farms that use high inputs of soil amendments and pesticides for diversified crop rotation systems. The main source of irrigation water and nutrients for vegetable farming in southern Hanoi is wastewater from the To Lich River. In northern Hanoi, irrigation water is obtained directly from the Red River and nutrients are supplied through high fertiliser inputs. The concentrations of COD (144–287 mg l^?1), N-NH₄ ⁺ (1–25 mg l^?1), PO₄ ^3? (0.5–4 mg l^?1) and coliform (525 × 10³?28 × 10⁶ MPN 100 ml^?1) along the To Lich River was much higher than the limits specified in the Vietnamese standard for water used in agriculture. A higher Cu content in soil in Phuc Ly seems to be linked to the high input of chicken manure at the site. However, the contents of heavy metals in irrigation water, in vegetables and in the soil surface layer at the two sites were lower than the Vietnamese maximum permissible levels.     

The future of farming: The value of ecosystem services in conventional and organic arable land. An experimental approach

In the current work, a novel, experimental ‘bottom-up’ approach is used to quantify the economic value of ecosystem services (ES) associated with highly modified arable landscapes in Canterbury, New Zealand. First, the role of land management practices in the maintenance and enhancement of ES in agricultural land was investigated by quantifying the economic value of ES at the field level under organic and conventional arable systems. This quantification was based on an experimental approach in contrast with earlier value transfer methods. Total economic value of ES in organic fields ranged from US $1610 to US $19,420 ha^− 1 yr^− 1 and that of conventional fields from US $1270 to US $14,570 ha^− 1 yr^− 1. The non-market value of ES in organic fields ranged from US $460 to US $5240 ha^− 1 yr^− 1. The range of non-market values of ES in conventional fields was US $50 — 1240 ha^− 1 yr^− 1. There were significant differences between organic and conventional fields for the economic values of some ES. Next, this economic information was used to extrapolate and to calculate the total and non-market value of ES in Canterbury arable land. The total annual economic and non-market values of ES for the conventional arable area in Canterbury (125,000 ha) were US $332 million and US $71 million, respectively. If half the arable area under conventional farming shifted to organic practices, the total economic value of ES would be US $192 million and US $166 million annually for organic and conventional arable area, respectively. In this case, the non-market value of ES for the organic area was US $65 million and that of conventional area was US $35 million annually. This study demonstrated that arable farming provides a range of ES which can be measured using field experiments based on ecological principles by incorporating a ‘bottom-up’ approach. The work also showed that conventional New Zealand arable farming practices can severely reduce the financial contribution of some of these services in agriculture whereas organic agricultural practices enhance their economic value.     

Maximising sustainability of Dutch dairy farming systems for different stakeholders: A modelling approach

A multi-attribute sustainability function is included into a dairy farm LP-model by using Weighted Goal Programming. The created Weighted Linear Goal Programming (WLGP)-model is used to maximise sustainability of different Dutch dairy farming systems and to analyse the impact of: (1) maximisation of individual sustainability aspects (economic, social and ecological sustainability) and (2) maximisation of overall sustainability using stakeholder preferences. Maximising the individual aspects of both dairy farming systems, i.e. conventional and organic, shows the trade-offs between different aspects of sustainability. For conventional as well as organic dairy farming maximum scores are highest for external social sustainability. The conventional dairy farm achieves a slightly higher score for overall sustainability than the organic dairy farm for all stakeholders (i.e. consumers and producers). This shows that it is possible for conventional dairy farms, similar to the conventional farm used in the analysis especially regarding the stocking density and under Dutch policy conditions, to achieve equal sustainability scores in comparison with organic dairy farms. It is concluded that the WLGP model is a suitable tool to analyse the sustainability of different dairy farming systems.