经济生产量模型对库存的控制

在分析需求变化的基础上修改和完善了经济批量模型,进一步研究了单项物品和多项物品的最小经济生产批量以及年最小总成本,改进了经济生产量模型。

二层信用条件下多物品经济生产量模型

在二层信用条件下,建立零售商相关成本极小化的多物品经济生产量模型,讨论模型最优解的存在性、唯一性以及寻求方法,并用具体的数值例子验证模型的有效性.

用区间数对需求量和生产量进行模糊化来求解经济生产量模型

在基本的生产库存模型中(即在清晰情况下),为了求解每周期的经济生产量,总是把每天的需求量和生产量看作常量。但是,在实际中每天的需求量和生产量受各方面偶然因素的影响而有一定的变化,变化范围分别是在某个区间内。且每天的需求量和生产量分别落在这两个区间内的可能性差不多,即可认为这两个量是区间数。为此,我们用区间数对其进行模糊化,从而扩展了该模型的应用范围,对实际的应用将更有参考价值。

对合理确定原煤经济生产量和保险储备量的探讨

本文依据利益最大原则 ,利用定量分析方法 ,结合煤炭企业原煤生产的实际情况 ,研究建立了市场竞争条件下确定煤炭企业原煤经济生产量和保险储备量的数学模型 ,为煤炭企业实现以销定产 ,减少产品积压损失 ,不断提高经济效益提供了一种有效的分析手段。

国际合作

高铅玻璃管项目名称;高铅玻璃管生产工厂. 项目来源;台湾。合作方式:合资。产品用途:制造节能灯管,灯炮灯丝支架玻璃,灯炮排气管。项目总投资额:650万美元。

Effect of Biofertilizer on Growth, Productivity, Quality and Economics of Rainfed Organic Ginger （Zingiber officinale Rosc.） Bhaisey cv. in North-Eastern Region of India

Ginger yields in the NorthEastern region of India are low because the extremely poor farmers of the region can not afford to apply any chemical fertilizers and hence apply only the locally-available farmyard manures to ginger fields. Biofertilizers may be a cheap source of fertilizers for ginger cultivation as they can increase nutrient availability and improve rhizome quality and are required in small quantity. An investigation was thus undertaken to study the effect of different biofenilizers on growth, productivity, quality and economics of organic ginger grown under rainfed condition in NorthEastern region of India. Seed treatment with biofertilizers enhanced growth, increased rhizome yield by 19.0% and resulted in 32.4% higher net profit over control. Among the seed treatments, Azotobacter 5.0 kg ha＂l, Azospirillum 3.75 kg hal and Phosphotica 3.75 kg ha-1 were found optimum in improving most of the growth attributes, increasing yield components and yield of rhizome by 5.6%-13.5%. They also improved rhizome quality by increasing specific gravity, oleoresin and dry matter content and by decreasing crude fibre in rhizome. They resulted in higher net return by 4.0%-12.0% as compared to their other levels. Combined use of Azotobacter 5.0 kg hal along with Phosphotica 3.75 kg ha＂l was found to be the best treatment combination which greatly improved growth and yield attributes of ginger and ultimately recorded markedly higher productivity （2.0%-23.5%） over other combinations. This treatment combination improved the quality of the produce and resulted in the highest gross return （$4,905 hal）, net return （$3,525 hal） and return per dollar （3.55） invested in ginger cultivation. It appears that growing organic ginger by treating the seed rhizome with Azotobacter 5.0 kg ha-~ along with Phosphotica 3.75 kg ha-1 can result in good growth and high productivity of improved quality rhizome and ultimately result in maximum net profit and thus can be recommended for the NorthEastern region of India.

The ＂Minister of Production in the Collectivist State＂ as a Third Way of the Market： China Between Ethics and Growth

This paper proposes a comparison between the Chinese social-economic system of today and the economic planning system theorized by Enrico Barone in 1908, which described in his famous paper ＂The minister of production in the collectivist state＂. The work stems from a critical reflection on the premises of the capitalist market system. From Adam Smith to J. M. Keynes （included）, economists have identified in traditional capitalist models （search for maximum profit, economic efficiency, free competition system） the best economic system, universally implementable, feasible and infallible in democratic capitalist contexts. In the history of economic ideas have always been clear gap between the ＂capitalist system＂ and the ＂collectivist system＂. The choice of a government had to fall back on one or on the other system. The first considered ＂good＂, the second considered ＂bad＂ for economic growth. Times since September 11, 2001, however, seem to have debunked the myth of capitalism as the only model of democratic growth： Asia and China have given the world a lesson in humility. China has shown that although not being a democratic country could developed a robust and highly competitive economic model that has weakened the pillars of the western capitalism. China through Confucianism and Taoism has been able to establish the new global economic laws： low labour costs, low prices, mass production of low quality with a mixed mercantilist philosophy which is unknown to the Western world： the silent, smooth, radical trade expansion. As in a game of dominoes, China has been able to drop the capitalism safeties and America had to bow its head and agree to no longer be the only great power in the international scenario. But the peculiarity of this work is not only to define the root causes of China＇s success in the West; also reflects the fact that an Italian economist （Enrico Barone）, in 1908, predicted analytically and developed a theoretical system very similar to that of China nowadays, between capitalism and collectivism （a third way of the market）. The Asian culture has developed a market system that has proven to be accommodating to the needs of the capitalist market and to grasp the development opportunities that the same Western capitalism has offered.

Appraisal of the vegetation-based services for cropland ecosystems: a case study of a high-yielding county in North China

As people become increasingly aware of the irreplaceability of ecosystem services, defined as ＂the nataral environmental conditions and effects upon which peopic rely for existence that are formed and maintained by ecosystems and ecological processes＂, more emphasis is being placed on these services＇. In rectent years numerous studies have focused primarily on the sen,ices of natural ecosystems. This paper expands the scope of this field from natural ecosystems to semi-natuval ecosystems, i.e. cropland ecosystems, which are closely associated with human productivity and life. Taking Huantat County in Shandong Province as an example, the vegetation.based services of winter wheat/summer maize rotation systems and carton cropland ecosystems were systematically analyzed, including the material production, carbon dioxide fixation, oxygen release, water conservation, and nutrient recycling. These services were then evaluated in terms of economics through the applications of a market value technique, a substinaion engineering method and a shadow price method. The results indicated that the total economic value of cropland ecosystem vegetation.based services in Huantai County is 124.827.3 ×10^4 yuan. which is equivalent to 15.63% of the GDP of Hnantat County （798, 491 × 10^4 yuan）, Among these services, the gas regulation value is 82.698.3 × 10^4 yuan （66.25%）, the material production value is 38.049.4 × 10^4 yuan （30.48%）, the nutrient cycling value is 3257.3 × 10^4 ynan （2.61%）, and the water conservation value is 822.3 × 10^4 yuan （0.66%）. In addition, through the comparison between winter wheat/summer maize rotation systems and cotton cropland ecosystems, we conclude that the economic value of vegetation-based services provided by the former is much higher than that of the latter, which could provide a scientific guideline for adjusting the agricultural structure, Our study may facilitate the conservation of cropland ecosystems and promote effective use of vegetation-based services to achieve sustainable development of agriculture and guarantee nationwide food security.

Dependence of Consumption Volume on the Labor-Force in One-Productive Models of Economic Dynamics

In the work one-productive model of economic dynamics the labor-force involved in production is investigated the case when or function with constant elasticity of substitution （CES） is studied. is considered. The dependence of the consumption volume on production function coincides with the Cobb-Douglas function

COAL QUALITY CONTROL

Coal storing and loading have much more influence on coal quality. In the paper, a goal programming model has been constructed to determine the ideal quantity extracting from stockpile and silos and a quality control model is inferred under the guidance of maximum theory of dispersed number and practice methods are given to meet production demand, with which a coal mine has achieved a better tech-economic result.

Organic Cultivation of Lemon Ballm （Melissa officinalis） in Macedonia

The possibility for perspective growing of medicinal, aromatic and spice plants, can be expected only if their cultivation is based on the principles of organic farming. The cultivation of this group of plants is usually associated with satisfactory yield level and raw materials with uniform quality. This paper contains the most important features of lemon balm （Melissa officinalis）, and methods of cultivation. Data of two annual activities are presented and they are related with organic system of cultivation in the central part of Macedonia. The objective of this study is to analyze, determine and demonstrate the economic viability of lemon balm organic production with irrigation. In the first year, there were only two moving, yielding 500 kg/ha of above-ground plant dry mass. In the second year, there were three moving, yielding 6,775 kg/ha of above-ground plant dry mass. Economic analysis is proved that profitability in organically produced lemon balm is obtained in the second year of growing when the profit reached $6,150/ha.

The Role of the Project Manager in Construction Projects in India

In India, the construction industry plays an important role in the economy of the country. It employs a sizeable portion of the work force, contributes largely to the gross domestic product （GDP） of the country, and is seen as a key catalyst for the growth and development of the Indian economy. The industry, however, is beset with many challenges, including delivering projects within projected costs and delivery dates and at the right quality to increasingly discerning clients. It is because of this that project management has assumed so much importance with the project manager seen to be a critical resource in the project achieving its objectives. However, the role of the project manager is still ambiguous. These research hypotheses that the role the project manager ought to play is that of a leader. It is only when project managers assume leadership roles that construction projects achieve objectives measured against time, cost, quality, and customer satisfaction. A quantitative approach was followed in this using both theoretical and analytic methods. The theoretical studies revealed the qualities, skills, and competencies that a project manager ought to possess and the links between the project manager assuming a position of leadership and the project achieving its objectives. The main data collection tool in the analytic method was an online questionnaire administered to 20 project managers of construction projects in India. It was found that while the Indian construction industry does recognize the significance of project managers, their role is relegated to administrative, monitoring, and supervision tasks. There is an overwhelming focus on technical skills. In those cases, where project managers were involved in all the stages of the project and possessed a gamut of managerial, technical, human, and interpersonal skills, there were substantial differences in terms of time, cost, quality, and customer satisfaction in the projects administered by them. The importance of this research stems from its alerting the construction sector in India to the true role that project managers ought to play. If it serves in a shift in the perception of the role of the project managers, this research would have served its purpose.

Comparative Assessment of the Effect of Wastewater Sludge Biochar on Growth,Yield and Metal Bioaccumulation of Cherry Tomato

To investigate the potential effects of wastewater sludge and sludge biochar on growth, yield and metal bioaccumulation of cherry tomato （Lycopersicon esculentum L.）, a pot experiment was carried out under greenhouse environment with three different treatments, control soil （CP）, soil with wastewater sludge （SS） and soil with sludge biochar （SB）, to reveal the comparative effect between the amendments of wastewater sludge and sludge biochar. The soil used for pot experiment was Chromosol. Wastewater sludge and sludge biochax produced through pyrolysis process at 550 ℃ were applied at 10 t ha-1. No significant difference was found in growth and production of cherry tomatoes between wastewater sludge and sludge biochar applications to the soil. The accumulation rates of metals in the fruits were lower in the treatment with sludge biochar than in the treatment with wastewater sludge. The study highlights the benefits of risk mitigation from toxic metal accumulation in fruits using wastewater sludge and sludge biochar as soil conditioners.