Issue Ebookcover story
List of IssuesDocument Types
- Keywords：flounder,Lactobacillus rhammosus,Lactobacillus casei,colonization,gastro-intestine1|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：A Bacillus strain isolated from cantaloupe juice treated by superhigh-pressure sterile was shown to produce a high molecular polymer. The purified polymer, was a homopolymer of glutamic acid and had an absorption peak at 212nm. The molecular mass was 570-669ku detected by SDS-PAGE electrophoresis and had no typical structure of protein. With the following identifications of colony morphology, physiological and biochemistry experiments, G+C content and 16S rRNA gene sequence as well, the strain was identified as B. subtilis.2|2|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Keywords：nitrate-test strip,reflectance (Merck),continuous flow analysis (CFA),soil nitrate content,water content0|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：It is well known that it is difficult to get the morphological data for a laboratory watershed model in soil erosion study by the traditional methods and the RS, GPS and GI technologies. A practically useful apparatus was developed to quantify the digital elevation of a laboratory watershed model for a 66m2 watershed with 10 by 10cm grids. A GIS software was used to generate the DEM of the watershed and the measured elevation values were verified with the actual ones at control points, which indicated that the error was less than 5mm. This method can be used for geomorphologic determination of a watershed and for quantifying the soil erosion in a rainfall event by comparing the elevation changes.Keywords：watershed model,GIS,elevation measurement,soil erosion1|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：Conservation tillage techniques have become the most important measures of sustainable agriculture develoment. This paper introduces the concept and types of conservation tillage. The principles, advantages and disadvantages of conservation tillage also are discussed in this paper. Through less disturbance and uncovering, conservation tillage can keep soil in a moderate moist and coarse state, which can reduce soil erosion, improve soil fertility, save water, and increase yield and efficiency. This article summarizes the worldwide history of conservation tillage development and also proposes its development trend. Considering China agriculture development, the problems during extending conservation tillage are discussed, which will benefit to protect agriculture environment and agriculture sustainable development.Keywords：conservation tillage,regional agriculture,sustainable development2|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Keywords：wheat,grain,nutrient guality,increased CO 20|7|0<HTML><L-PDF> <Meta-XML>Updated：2023-12-22
- Abstract：Cistanche tubulosa (Schenk) Whigt is one of the endangered Chinese medicinal herbs. The objective of this study was to cultivate Cistanche tubulosa on Tamarix chinensis Lour. in North China Plain. Cistanche tubulosa was introduced to Tamarix chinensis Lour. by root-tube method. The inoculation rate of Cistanche tubulosa was 80% when the seed was pretreated by a suitable plant growth regulator solution and the inoculator was poured by a suitable inoculation medicament solution and the relative moisture The root diameter of the host ranged from 0.2 to 0.5cm. The results showed that root inoculation rate of Cistanche tubulosa was 90% by using these methods.Keywords：Cistanche tubulosa,Tamarix chinensis,inoculation rate0|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：Two experiments were conducted to investigate the effect of feeding alcohol-fermented corn on in vitro rumen fermentation, blood physiological parameters and slaughtering performance of Yanbian cattle. Two diets containing alcohol-fermented corn (AFCD) or regular corn (CK1) were used as treatments. In Expt. 1, in vitro gas production method was used to compare the influence of AFCD and CK1 diets on rumen fermentation traits. The result showed that AFCD had no change in the dry matter digestibility (P>0.5), but had 9.7 percentages of NDF digestibility higher than CK1 diet (P<0.006). Although 72h gas production (GP) and potential GP of AFCD were quantitatively lower (P>0.12), AFCD had faster rate of GP (P<0.06) and shorter lag time (P<0.04) than the CK1 diet. AFCD treatment unaffected (P>0.1) in vitro rumen pH value, ammonia concentration, total VFA production and individual VFA proportion. In Expt. 2, six Yanbian Yellow steers averaging 280kg of body weight were used in a feeding (12 weeks) and slaughtering trial to determine the effect of feeding AFCD diet on the blood physiological parameters and the slaughtering performance. Feeding AFCD diet resulted in higher content of serum glucose (P<0.01), whereas the concentration of total blood albumen, lipids, calcium and phosphate in serum did not differ (P>0.06) between AFCD and CK1 diet. Dressing percentage, net meat rate and rib eye areas of cattle fed AFCD increased 8.33%, 11.43% and 7.02% (P<0.05), respectively. The cattle fed AFCD had increased content of carcass fat (P<0.01) and unsaturated fatty acids (P<0.1), unchanged amount of total essential or non-essential amino acids (P>0.1) of longissimus muscle, indicating a beneficial effect of feeding alcohol fermented corn on beef quality of Yanbian cattle.Keywords：alcohol-fermented corn,yanbian cattle,in vitro gas production,blood physiological parameter,slaughtering performance2|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：An open and self-forming expert system based on B/S was presented. The system involves several work-order-sheets, such as substation work-order-sheets, power line work-order-sheets and power-failure work-order-sheets. It can be used in transmission and distribution electrical maintenance and dispatching management system. By using procedural describing knowledge and dynamic frame, the expert system with strong adaptability is independent of system connection and equipment. A complex inference engine for generating operation-item and a developing model for software workflow based finite automaton were used in the system. This workflow management system solved some problems that engineers might meet in electrical maintenance.Keywords：electric power,electric work order sheet,based-object,procedural knowledge1|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Keywords：strawberry-collection,robot,LRCD,chromatism1|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：A full movement limiter for an automobile crane based on Intel MCS96 serial 16 bits single chip microcomputer was developed in the paper, which monitored the parameters in real time during the operation of an automobile crane and displayed the data of weight, length, angle, and radius etc. on a LCD. Based on the rules of design, the system will raise the alarm or force the machine stopped if the measured moment exceeds the set value and the limiter will store the state parameters, such as weight, length, angle, radius and time, automatically and keep them even the power supply off. The limiter has been tested and proved qualified on the spot. It can be applied to various serial automobile cranes by changing the parameters of software and the sensors.Keywords：bits single chip microcomputer,full moment limiter,data storage,security1|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Keywords：a tiny heat probe,concentration content,apple juice,thermal conductivity0|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：In order to quantificationally evaluate whether the way of land usage in the north ecotone of China is sustainable,the ecological footprint (EF) analysis was used to estimated the EF and ecological capacity of Wuchuan county of Nei Monggol, where locates in the north ecotone of China, with the data in 2002. The result shows that the EF of Wuchuan is 1.29hm2, the ecological capacity is 0.95hm2, and the ecological deficit is 0.34hm2, which implies that the developing situation in Wuchuan county is unsustainable. Based on the analysis of the actual situation of Wuchuan county, some suggestions for reducing the ecological deficit were recommended. Multiple approaches should be taken in this region to achieve the goal of sustainable development, such as slowing down the rate of population growth, increasing the productivity of land, changing the traditional mode of land exploitation, and improving the efficiency of resources. Also some problems were analyzed in this article.Keywords：ecological footprint,sustainable development,Wuchuan county0|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：In order to analyze the influence of investment and product cost upon enterprise profits after establishing vertical enterprise alliance, the article established a dynamic game model in two stages of vertical enterprise alliance based on the game theory. The results indicated that the profit of enterprises those took the lead to alliance were increased obviously, which encouraged enterprise to go to the fore of alliance. With numbers of enterprise alliance multiplied, enterprise investment will decrease and profits of allied enterprise are increased. The market competition ability of allied enterprise is improved.Keywords：enterprise,vertical alliance,game1|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Keywords：agricultural science and technology park,developmental models,operating mechanism0|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：The technologies of Windows Server, SQL server 2000 network database and VB.NET were taken as developing tools in the process of system research. The system consists of three modules, hoggery module, slaughterhouse module, and distribution module. There are four subsystems in each module, recording management subsystem; safety monitoring subsystem; standard and statute subsystem; and yellow alarm management subsystem. The figure coding of the original plastic ear tag was kept down and a 2-D data matrix, having the same information as the coding, as animal identification in system was added. As a result, the automatically identifying capability of ear tag was improved. The yellow alarm subsystem can automatically give an alert for illegal acts in pork production processing.Keywords：component technology,pork safety,global control2|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：An optimization process of a thin-walled structure was performed by the response surface method, which took the maximum absorption energy from an impacting process as objective, the properties of the thin-walled structure as variables, and the impacting axial force as constraint. In this study, the explicit finite element code, ANSYS/LS-DYNA, was adopted to simulate the complicated impacting behavior of the thin-walled structure. The orthogonal design and least square methods were used to fit the response surface, and the optimal one was obtained by the numerical optimization program DOT. This optimization process would be repeated until a set of parameters optimized for optimum design of a thin-walled structure was obtained. The results demonstrated that the response surface method in structural optimization of impacting energy absorption was feasible, and had merits of high computing efficiency and short computing time.Keywords：structural optimization,impact,response surface method,finite element2|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：Based on the Reynolds' lubrication approximation and the perturbation method, the velocity and the pressure equations for two relatively moving spheres with an interstitial second-order fluid was derived and the analytical solution to its resistances of the tangential force and the torque were obtained. The results indicate that there exist normal stress differences in a second-order fluid, so the equations of velocity and pressure are more complicated than that for a Newtonian fluid; however, their final results are the same as that for a Newtonian fluid.Keywords：second-order fluid,the perturbation method,lubrication approximation,resistance0|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：The synthetic method of resveratrol was investigated in this study, in which with the raw materials should be readily available and cheap, and with simple manipulation. 3,5-dihydroxy benzoic acid was used as the starting substance. The key intermediate of 3,5-dimethoxy-benzyl-phosphonate was obtained through four steps of methylation, reduction, bromination, and arbuzov rearrangment. Following polymerization with anisaldehyde by Wittig-Horner reaction and demethylation with boron tribromidethe final product of resveratrol was obtained.The overall yield was 39.3%. In conclusions, this process had some advantages of commercially available,cheap starting materials, no requirement of chromatography and convenient manipulation.Keywords：resveratrol,stilbene,Wittig-Horner reaction5|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
