A Probe into the Mortgage Rates of Land Contract Management Rights Based on Unified Annual Output Value

The mortgage of land contract management rights has launched a pilot project in Ningxia,Hubei,Henan,Guizhou,Chongqing and other provinces,municipalities and autonomous regions,which provides a good solution to the problem of funds for rural development and plays a huge role in promoting local rural economic development.In the mortgage financing of land contract management rights implemented in various regions,how to determine a scientific,accurate and reasonable mortgage rate of land contract management rights becomes a difficulty troubling the mortgage financing of land.On the basis of unified annual output value of land,this article uses survey method,income capitalization method,and comparison method to analyze the value of land contract management rights,and finally determine the mortgage rates of land contract management rights.

Experimental Study of Buffer Gas Flow Rate Effect on Output Power of a Copper Vapor Laser

A copper vapor laser with active medium length of 60 cm and bore of 16 mm has been operated and optimized using different buffer gases to investigate the effect of the gas flow rates on the output power. It is found that there is a special optimum gas flow rate associated with the type of buffer gas.

Estimation of ammonia nitrogen load from nonpoint sources in the Xitiao River catchment, China

Ammonia nitrogen (NH4+-N) is one of the three main forms of total nitrogen (TN). Most studies have estimated the load of TN from nonpoint sources instead of one specific form. The relationship between land use and concentrations of NH4+-N in runoff was analyzed using the hydraulic analysis functions of a Geographic Information Systems (GIS), and the annual loads of NH4+-N in the Xitiao River catchment were estimated according to model results. The results suggested that the calculated annual loads of NH4+-N...

FORECAST OF CHINA'S GRAINPRODUCTION DEVELOPMENT AND ITSSELF-SUPPORT RATE ANALYSIS

This far stern difficulhes and challenges fatal by the dev ofadn P in etna. to the bac national snon of China and the of and min the world market, China must meet the and Inainly by her own production. Using the input output and system edence metal, this makesa foast abbot China’s glain output, grain and allsupport rate in the year 2030.

Contribution of Agricultural Input to Output in Hohhot City

Based on the research data from the economics and management platform of Inner Mongolia Agricultural University,we analyze the changes in the input of agricultural production factors,such as farmland,labor and capital in Hohhot City. Based on the principle of econometrics,we select the agricultural production input-output data in Hohhot City during the period 1992-2010,and establish the econometric model using Cobb-Douglas production factor,to estimate the rate of contribution of agricultural input to the growth of agricultural output value,and study the quantitative relations between agricultural input and agricultural output value. The results show that in Hohhot City,the contribution of chemical fertilizer input to the growth of agricultural output value is the greatest; the contribution of mechanical power to agricultural output value is still not brought into full play; the contribution of remaining production inputs ( including technical progress) accounts for 35. 69% . In the future,Hohhot City should pay more attention to the technical input to develop agriculture.

Performance Analysis of an Energy System in the Tropical Rainforest: A Thermo-Economic Approach

This paper presents the thermos-economic evaluation of a simple gas turbine (SGT) within the Niger Delta, Nigeria. Steady-state monitoring and direct collection of data from the 25 MW plant were performed including logged data for a 12 months period. MATLAB software was used to model the various thermodynamic performance equations of the plants while net present value (NPV), internal rate of return (IRR), and Payback period (PBP) were used to model the economic concept of the plant performance. The thermodynamic analysis shows that for every 1℃ rise in the ambient temperature, the percentage power drop increases by 2.07%, thermal efficiency drops by 0.66%, and the specific fuel consumption increases by 0.93%. For every 1% drop in the power output, the percentage thermal efficiency drops by 0.79% for the given consideration. The economic analysis based on the performance reveals that the power shortages represent about 47.9% of the net power generated and the revenue worth of $4198741.60 is lost due to the inability of the plant to perform at its design point. The NPV value of $6434899.97 shows that the plant investment is viable for the period of twenty years of operation and the IRR on investment is determined to be 12.40% by a numerical approximation for the period, with a PBP of 8.5 years. This provides technical and economic details to plant operators and energy systems investors for decision making.

A Review of Geothermal Type-Curves with Damage Effect: A Case of Practical Apply to a Mexican Geothermal Field

A review of the art state was developed about the inflow relationships and their application for reservoir characterization. The theoretical development of the methodology for determining the damage effect using type-curves of the inflow relationships was shown. We show the process followed for achieve the geothermal type-curve affected with damage for reservoirs with mean salinities of 30000 ppm and temperatures up to 350℃. This type-curve was applied using measurement production data in a Mexican geothermal field. According with the obtained results is shown that the methodology for determining the damage effect using production measurements is a sure alternative for the damage effect calculation. It was used an alternative methodology in order to validate the damage presence and the obtained results were consistent. Last thing shows that both methodologies can be combined as a confident manner.

Performance of terahertz channel with multiple input multiple output techniques

Terahertz(THz) communication is being considered as a potential solution to mitigate the demand for high bandwidth. The characteristic of THz band is relatively different from present wireless channel and imposes technical challenges in the design and development of communication systems. Due to the high path loss in THz band,wireless THz communication can be used for relatively short distances. Even,for a distance of few meters( > 5 m),the absorption coefficient is very high and hence the performance of the system is poor. The use of multiple antennas for wireless communication systems has gained overwhelming interest during the last two decades.Multiple Input Multiple Output( MIMO) Spatial diversity technique has been exploited in this paper to improve the performance in terahertz band. The results show that the Bit Error Rate( BER) is considerably improved for short distance( < 5 m) with MIMO. However,as the distance increases,the improvement in the error performance is not significant even with increase in the order of diversity. This is because,as distance increases,in some frequency bands the signal gets absorbed by water vapor and results in poor transmission. Adaptive modulation scheme is implemented to avoid these error prone frequencies. Adaptive modulation with receiver diversity is proposed in this work and has improved the BER performance of the channel for distance greater than 5 m.

Forecast model of safety economy contribution rate of China

It is the rational and exact computation of the safety economy contribution rate that has the far-reaching realistic meaning to the improvement of society cognition to safety and the investment to the nation safety and the national macro-safety deci-sion-makings. The accurate function between safety inputs and outputs was obtained through a founded econometric model. Then the forecasted safety economy contribution rate is 3.01% and the forecasted ratio between safety inputs and outputs is 1:1.81 in China in 2005. And the model accords with the practice of China and the results are satis-fying.

RESEARCH ON THE QUALITY PRICE RATIO OF COKING COAL

If assortment priee parity of Clase coking coal and its qtalty price danrcnee is nonreasonable, it deren’t gulde in Anprotrig tbe quallry metaliurgical coking coal and may be influence theeconomic benefit of metallurgical enterprises. This paper propose the principles and mathematicmodel for determination aseortment party of clean cokingcoal and its quality difference of ash content in clean coking coal in order to urge wasbenes into producing superior clean coking cleal whichis under condition of consideration both interest waskeries and interest metallurgicai industry. It canbe used as a method in theory to make price strategies under condition of socialism maket economicfor washeries of clean coking

OPTIMAL POWER ALLOCATION WITH AF AND SDF STRATEGIES IN DUAL-HOP COOPERATIVE MIMO NETWORKS

Dual-hop cooperative Multiple-Input Multiple-Output (MIMO) network with multi-relay cooperative communication is introduced. Power allocation problem with Amplify-and-Forward (AF) and Selective Decode-and-Forward (SDF) strategies in multi-node scenario are formulated and solved respectively. Optimal power allocation schemes that maximize system capacity with AF strategy are presented. In addition, optimal power allocation methods that minimize asymptotic Symbol Error Rate (SER) with SDF cooperative protocol in multi-node scenario are also proposed. Furthermore, performance comparisons are provided in terms of system capacity and approximate SER. Numerical and simulation results confirm our theoretical analysis. It is revealed that, maximum system capacity could be obtained when powers are allocated optimally with AF protocol, while minimization of system's SER could also be achieved with optimum power allocation in SDF strategy. In multi-node scenario, those optimal power allocation algorithms are superior to conventional equal power allocation schemes.

积累率、再生产结构与经济增长——基于中国城市数据的实证研究

以价值衡量的净产出增长取决于社会中的积累率水平、追加资本的结构以及净产出增量的分配结构。经济增长是社会剩余和再生产结构的函数。本文运用我国1998—2019年4个直辖市和283个地级市(含省会城市)数据,对该结论进行了实证检验。研究结果显示:积累率、追加资本结构和劳动收入占比对我国经济增长具有显著性影响,这种影响在我国省会城市与非省会城市以及南方城市和北方城市间具有显著的异质性。在我国全面建设社会主义现代化国家的背景下,保持合宜的经济增长速度是维持社会稳定、实现发展目标的基础。随着我国资本密集度的不断提高、二元经济结构的调整、人口结构的变化以及创新型国家的建设,追加资本中可变资本比例的下降和劳动收入的不断上升,会对经济增长带来抑制作用。因此,应通过保持较高的积累率、调整投资方向、不断提高劳动生产率的方式获得理想的增长速度。

施氮量对云烟100高端烟叶产出率及品质的影响

[目的]为明确施氮量对宣威高端烟叶产出率及品质的影响,筛选出适宜主栽烤烟品种云烟100的最佳施氮量。[方法]通过田间试验,研究不同施氮量对烟株农艺性状、高端烟叶产出率及外观质量、物理特性、化学成分等烟叶品质的影响。[结果]施纯氮97.5、112.5 kg/hm^(2)处理的烟株田间长势较好,施纯氮67.5、82.5 kg/hm^(2)处理次之;高端烟叶产出叶位主要为第7~8片,施纯氮97.5 kg/hm^(2)处理的产出率较高;施纯氮97.5 kg/hm^(2)处理的外观质量、物理特性综合得分均较高,化学成分协调性表现最优。[结论]不同施氮量对宣威高端烟叶产出率及品质的影响较大,施氮量97.5 kg/hm^(2)处理的烟株田间长势较好,高端烟叶产出率较高,烟叶品质较好。

四腔混联压电泵结构设计与试验分析

为提高压电泵的输出性能,结合串并联结构压电泵的优点,提出一种四腔混联压电泵设计。在110 V,40~400 Hz范围的正弦交流电驱动下,对制作的试验样机进行气体介质、液体介质的输送性能试验。结果显示:压电泵输送空气时,压电振子的工作模式对输出性能的影响可忽略不计,最大输出流量可达3046 mL/min。压电泵输送液体水时,采用异步驱动,输出性能更好,驱动频率为140 Hz时输出流量达到最大,为1067 mL/min。试验结果为多腔体混联压电泵的实际应用提供一定参考。

Selection Method for New Energy Output Guaranteed Rates Considering Optimal Energy Storage Configuration

The output of new energy represented by wind power and photovoltaic power features volatility and randomness. It is a practical approach to use the guaranteed rate with statistical characteristics to analyze the output coefficient of new energy. However, there is a lack of analysis and demonstration on the value of the new energy output guaranteed rate. To solve this problem, a selection method for the new energy output guaranteed rate considering optimal energy storage configuration is proposed. First, the influence of the new energy output guaranteed rate on the new energy output coefficient is analyzed. Secondly, with the goal of minimizing the comprehensive costs, an optimal configuration model of energy storage based on the output guaranteed rate of new energy is constructed, and particle swarm optimization is used for the optimization solution. Then, according to the optimal energy storage configuration results under different guaranteed rates, a reasonable new energy output guaranteed rate is determined by maximizing the comprehensive benefits obtained from energy storage. Finally, an example applied to the power grid in an area of Guangdong in Southern China is provided to illustrate the effectiveness of the proposed method.

“双碳”背景下提高天然气商品率措施探讨

天然气商品率是体现天然气利用水平的重要指标,在“双碳”背景下,提高天然气商品率对于节能减排、核算甲烷排放水平意义重大。由于规范标准及统计方法不统一,中石油天然气商品率表观数值较低,进一步提高商品率需要摸清天然气流向、厘清关键影响因素。以中石油天然气流向数据为基础,剖析其主要影响因素及构成,并对标北美天然气流向及利用情况。结果 表明,中石油天然气实际利用率(商品量与井口产量的比值)介于美国和加拿大之间,商品率主要影响因素是油气田生产自用量和损耗量。其中自用量以稠油热采用气、加热炉用气以及压缩机用气为主;损耗量多为计算值,虚无损耗量较大,并非真实的跑冒滴漏量。提高天然气商品率首先是一项管理工程,其次是技术工程。建议要统一规范天然气工业产量统计方法;通过提高设备效率、推广可再生能源利用等降低自用气量;加强对损耗气的管理,减少虚无损耗量,降低排放量;增加天然气利用率指标,体现其真实利用情况。

添加热压铁块对宝钢2号高炉生产的影响

为了探索减少高炉碳排放的新途径,在宝钢2号高炉进行了添加热压铁块工业试验。从炉况顺行、煤气流、透气性、煤气发生量、热制度、渣比、日产量、CO_(2)排放量等方面,阐述了添加热压铁块对2号高炉生产的影响。热压铁块比加到60kg/t后的结果表明:①随着热压铁块比的提升,炉况顺行得到改善,入炉品位提高,燃料比大幅降低,产量提升,取得了明显的增产降耗效果;②焦比由基准期的415kg/t降至353kg/t,燃料比从514kg/t降至最低488kg/t;③富氧率提升至4.255%,利用系数达到2.181t/(m^(3)·d),日产量较基准期提高5.9%。