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- Abstract：In order to assess virus inhibition of the extract liquid originated from herb medicine,the extract liquid was mixed with Newcastle disease virus(ND),H9N2 subtype and H5 subtype of avian influenza virus(AIV) respectively before inoculation into chicken embryo on day 10.In the meantime,the extract liquid was applied continually to 21-day old specific pathogen free(SPF) chickens by oral drop.After five days of oral administration,the SPF avian challenged by ND virus and AIV-H9N2 virus respectively was monitored every day to determine the protection against above two pathogens.The results implied that the extract liquid had no toxin for chicken embryo;ND and AIV-H9N2 virus could not proliferated and proved to be negative in chicken embryo after treating with 20?mg/mL,10?mg/mL,5?mg/mL and 2.5?mg/mL herb medicine respectively.Only 6/8 chicken embryos remained alive during the inoculating with AIV-H5 subtype virus and the specific virus could be isolated on urine sac of the chicken embryo after treating by 2.5?mg/mL herb medicine.In the challenging experiment against NDV and AIV-H9N2 virus,5/5,5/5,5/5 and 4/5 SPF chickens could survive respectively.The above evidence implys that the extract herb medicine can inhibit the proliferation and prevents the challenge by above two virus.It is anticipated to develop the effective medicine for preventing avian influenza if the main substances in herb medicine will be identified in future.Keywords：herb medicine(SHY),Newcastle disease virus,avian influenza virus,protection2|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract："3S"technology has been important during the formation of the scientific development concept.It is needed especially in the implementation of this concept in agricultural research and production.Meanwhile,the concept demands higher technical support nowadays.In this article,the authors summarize their relations, introduce the application of "3S" technology in agriculture,and bring forward some technical solutions of cutting-edge issues to implement this concept in agriculture.These technical solutions involve data mining,unified management of spatial and temporal data,agricultural knowledge engineering,information technology engineerazation,and so on.Keywords："3S"technology,land and resources management,digital agriculture,data mining,agricultural knowledge map,information technology engineerization,5|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：CBNRM(Community-based Natural Resource Management) has being becoming an international approach to analyze and implement natural resource management. This paper provides a synthesis of conceptual framework,background of development,analysis framework,strength of implementation,experiences,and challenges of implementation of CBNRM.This synthesis paper particularly highlights the problems and issues on aspects of resource tenure and access,capacity of collective action,space and opportunity of livelihoods,and partnership building between different stakeholders.This paper synthesis main challenges encountered in practice of CBNRM described in some documents,including,including decentralization for government,financial assistant to community,property arrangement for resources,capability building for community,and promoting participatory,and so on.0|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The method of generalized linear mixed models(GLMM) was described.It allowed genetic analyses and heritability efficiency estimate for threshold traits in livestock under different parameters.The results showed that GLMM is advantageous in heritability estimation and accurate for discrete traits.The estimated maximal mean standard error(MSE) and heritability bias(BIAS) are respectively 0.018?4 and 0.429?0 for all different parameters.The increase of the true heritability and incidence of categorie induced the improvement of heritability accuracy,showing that the accuracy of estimation directly depended on these two parameters.Keywords：generalized linear mixed model(GLMM),threshold traits,heritability,genetical analysis0|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：A new seeding technique of irrigating-sowing machine was studied which could ensure seeds and water to flow into seedbed furrow together at the same level. Based on general analysis, a waterway system of the machine was designed, Take the water valve of the waterway system for example, its parameter models were set up. By applying optimum technique and major function of Matlab, its optimum design parameters were obtained, diameter of water pipe of exit was 2.5 cm, thickness of head of valve core 0.7 cm, strokes of the core I. 9 cm, diameter of big side surface of the core 6, 1 cm, and small side surface 3.0 cm. And coefficient of local loss-of-head of the water valve is 2.08. This optimum method is suitable for optimization parameter design of other parts in waterway system.5|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to improve the hydraulic analysis method of a sprinkler irrigation system,the characteristics of the finite element method,the forward step method and the other numerical methods were evaluated in this paper.By introducing the idea of the forward-step method and the back-step method,a new numerical method,ESM(extented stepwise method),was presented for the hydraulic analysis of a sprinkler irrigation system with bilateral main-pipes arrangement.This method is an extension of the stepwise method.A computer program employing this technique was designed so as to provide sprinkler outflows and pressure head distributions of the system.The numerical example demonstrates that the analytical procedure is simple and accurate for the hydraulic analysis of a sprinkler irrigation system with bilateral main-pipes arrangement.3|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Aquaculture Water Quality Evaluation is a comprehensive multiple objective evaluation in terms of aquaculture water quality,which is the important part for aquaculture water quality management.In order to analyze the evaluation method of aquaculture water quality,the paper used expert's questionnaire,Delphi and fuzzy mathematics,establishing water quality evaluation index and criteria.Aquaculture water quality evaluation fuzzy synthetically evaluation model is put forward too,which makes the results more objective and more reasonable from vast experimental result.3|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To enable the fuzzy data from an expressway maintaining system to be processed the fuzzy data collected from each kilometer expressway were dealt with and the quantificational value of the road status was given by the weighted mean method, in which some kind membership grade of different road conditions were considered, a continu- ous smoothing subordinate function was defined, and the fuzzy data were integrated into the Oracle database. The ways to set up a corresponding fuzzy data model by a fuzzy database system under the subjection function and to query and analyze the fuzzy data were described. The processing procedure is simple and can be applied to the similar MIS systems.0|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：With the consideration of the actual stiffness of bottom chords of a truss and based on the displacement method, an accurate method as well as its corresponding formulations for a greenhouse structure analysis under wind load were presented and a concept of the equivalent stiffness of greenhouse structure was brought forward. By comparing the presented method with the approximate method and the finite element method, the main influencing factors of wind load, section stiffness of bottom chords of greenhouse trusses and the span number of a greenhouse was investigated. We concluded that the calculated results from the method presented in this paper and the FEM coincided well; the deformation of truss had a great influence to the inner force of the frame; the truss could not be considered an infinite stiffness transverse beam; the influence of the deformation of a truss should be considered in engineering design when the number of span was more than eight or the stiffness ratio of the beam and column was less than 1500 mm^-2.1|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The whole processes of a in-plane primary flexuosity and a secondary bifurcation flexuosity were traced by a high-efficient tracing strategy. The elastic-plastic primary buckling load and the secondary bifurcation buckling load under a full-span load distribution and the primary buckling load under a half-span load distribution were obtained. The calculation results show that the secondary bifurcation flexuosity is always the most dangerous buckling type when the arch is under a full-span load distribution for an elastic-plastic arch. The secondary bifurcation will always happen be- fore the primary flexuosity. For a primary buckling load, the limit load carried capacity of the arch of 0.23 ratio-span is the biggest one under a half span load distribution and that of the arch of 0.1 rise-span ratio is the biggest under a fullspan load distribution. For a secondary bifurcation buckling load, the limit load carried capacity of the arch of 0.1 rise- span ratio is the biggest one under a full span load distribution. Finally the elastic-plastic limit loads carried capacities of arch under a full and half span load distributions were calculated and their mathematical models were induced for engineering reference.0|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To produce plant food, regenerative water and electric power from manure; and control the environmental pollution by dung bath a PLC controller was designed for a dung resource regeneration system, The system is made up of a flocculation device, a UASB and a MBR and is controlled by the self-designed PLC, The practical use of this system shows that it can dispose of 400 t dung and produce 15 t plant food in which COD is less than 120 mg/L and SS less than 30 mg/L and pH value is about 7-8.3|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To evaluate the present situation of land use in Po-yang Lake region in 1997 and 2000,the changes of cultivated land,forest land,garden plot,meadow,resident land,traffic land,water areas,and non utilize land were analyzed aiming at 12 counties and cities surrounding Po-yang Lake.The biggest changes of the lands are non-utilize land(-42.44%) and water areas(+28.95%) around 1998,and then the traffic land(+7.97%) and the garden plot(-6.40%).Among eight major kinds of land utilizations,the utilizations of water,traffic,residential and industrial,and mining areas are increasing,while all the others are reducing in various degrees.Based the analysis on the relationships of "person-land-water" and the land readjustment potentiality in Po-yang Lake region,we suggest that the attention should be paid to the ecological environment and the combination of management,exploitation and development.We should pursue the land productivity and the improvement ecological environment instead of only the cultivated land growth.We should also reduce the cultivated land to recovery the original lake region.0|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Based on the theory and method of the ecological footprint(EF),ecological footprint index(EFI),is developed as a new indicator for quantitative evaluation of China sustainable development.The index is the percentage of the difference between bio-capacity and ecological footprint in bio-capacity in a region,considered as a remained capacity of sustainable development in the region as well.It can be used for evaluating more exactly the capacities of regional sustainable development.The larger the index indicates the higher sustainable development of the region.In contrary,the smaller the index,the lower sustainable development the region has.EFI=100% indicates non human being disturbance.EFI=0 implies marginal sustainable development.The yearly changes of the index show the changes of regional sustainable development and its tendency.The results of a case study in China showed that the index decreased from 46% in 1962 to46% in 2001,which indicated a decreasing sustainability.0|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：According to the characters of China's agricultural products trade in recent ten years,the constant market-share model was used to analyze the influencing factors of China's agricultural products exportation.As showed in the conclusion,the increasing of China's agricultural products export mainly results from the enlargement of international import markets,to the contrary,the change of agricultural products competitiveness and markets distribution lags the increasing in the period.Meanwhile,on the important target market such as Japan,agricultural products competitiveness greatly and positively affects China's export scale. It is apparent that the research can be an important and objective reference of enacting policy of how to improve China's agricultural products export.4|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
