Search

Copyright of Population & Economics / Renkou yu Jingji is the property of Capital University of Economics & Business and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Tissue Engineering Research / Zhongguo Zuzhi Gongcheng Yanjiu is the property of Chinese Journal of Tissue Engineering Research and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Iron Steel Vanadium Titanium is the property of Iron Steel Vanadium Titanium Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Applied Chemistry is the property of Chinese Journal of Applied Chemistry and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Tropical Geography is the property of Tropical Geography Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of South China University of Technology (Natural Science Edition) is the property of South China University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Soochow University Educational Science Edition is the property of Soochow University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Henan Agricultural Sciences is the property of Editorial Board of Journal of Henan Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Sciencepaper is the property of China Sciencepaper and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Clean Coal Technology is the property of Clean Coal Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Foreign Language & Literature Research is the property of Central China Normal University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Irritable bowel syndrome (IBS) is the most common functional gastrointestinal disease, and its incidence shows obvious gender differences. The incidence of IBS in females is higher than that in males, and the clinical characteristics of IBS also show some gender differences. The levels of estrogen and androgen in patients with IBS are significantly different from those in healthy controls, which suggests that gender differences, sex hormone levels and their biological effects between men and women may play an important role in the pathogenesis of IBS. Therefore, the review systematically reviews the correlation between sex hormones and the pathogenesis of IBS, and the research progress of its related mechanism in IBS, in order to provide new ideas for explaining the pathogenesis of IBS and exploring new therapeutic strategies. [ABSTRACT FROM AUTHOR]

With the complexity of global crude oil trade relations and the rising demand for crude oil in Asia, the "Asian premium" phenomenon in the global energy market has become a topic that needs attention. Based on the perspective of the complexity of the global oil trade net‐ work, this paper selected the 1993-2018 international crude oil trade data to conduct sample data surveys. By constructing a complex network model and potential competition index, this paper analyzed the Asian premium phenomenon in the global crude oil trade network and the potential competitiveness of China, Japan, India and South Korea. The research results show that the glob‐ al crude oil trading groups are divided and blended, and China, Japan, India and South Korea are showing a trend of trade grouping. From the perspective of global crude oil trade network indicators, the status and influence of China, Japan, India and South Korea in the global crude oil trade network continue to increase, which has strongly promoted the shift of the global crude oil consumption center to the Asia-Pacific region. The potential competition index shows that the potential crude oil competition relationship between China, India, Japan, and South Korea presents different characteristics. China and Japan show the characteristics of "first strong and then weak", both between China and India and between China and South Korea are characterized by an overall continuous increase With the complexity of global crude oil trade relations and the rising demand for crude oil in Asia, the "Asian premium" phenomenon in the global energy market has become a topic that needs attention. Based on the perspective of the complexity of the global oil trade net‐ work, this paper selected the 1993-2018 international crude oil trade data to conduct sample data surveys. By constructing a complex network model and potential competition index, this paper analyzed the Asian premium phenomenon in the global crude oil trade network and the potential competitiveness of China, Japan, India and South Korea. The research results show that the glob‐ al crude oil trading groups are divided and blended, and China, Japan, India and South Korea are showing a trend of trade grouping. From the perspective of global crude oil trade network indicators, the status and influence of China, Japan, India and South Korea in the global crude oil trade network continue to increase, which has strongly promoted the shift of the global crude oil consumption center to the Asia-Pacific region. The potential competition index shows that the potential crude oil competition relationship between China, India, Japan, and South Korea presents different characteristics. China and Japan show the characteristics of "first strong and then weak", both between China and India and between China and South Korea are characterized by an overall continuous increase [ABSTRACT FROM AUTHOR]

Copyright of Shandong Medical Journal is the property of Shandong Medical Health Newspapers and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Xinjiang Agricultural Sciences is the property of Xinjiang Agricultural Sciences Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Tropical Geography is the property of Tropical Geography Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objective To explore the potential dual-effect components and mechanism of Cistanches Herba in the treatment of osteoporosis with chronic kidney disease by network pharmacology and molecular docking technology. Methods Through multiple databases and literature searches, the intersection of the active ingredients of Cistanche and their corresponding targets with Chronic Kidney Disease（CKD） and Osteoporosis（OP） related disease targets was screened out, and then, construct a PPI network in the STRING database, screen the core targets with the CytoHubba plug-in, and perform GO ontology and KEGG pathway enrichment analysis in the DAVID database. After constructing the active ingredient-core target-signaling pathway network in Cytoscape, the key components, key targets and Key signal pathways, and finally molecular docking verification in AutoDockTools. ResultsObtained 3 key components of Cistanche for the treatment of CKD-OP（quercetin, β-sitosterol, salidroside）, 6 key targets（AKT1, TNF, MAPK1, JUN, RELA and PTGS2）, 3 key signal pathways（TNF, NF-κB and Oxytocin signaling pathways）. ConclusionThe preliminary discovery of the potential molecular pharmacological mechanism of Cistanche cistanche in the specific treatment of CKD-OP through "multi-component-multi-target-multi-pathway" provides a theoretical basis and ideas for the modernization of traditional Chinese medicine and the treatment of CKD-OP. [ABSTRACT FROM AUTHOR]

Economic globalization and regional integration are the core motivations of regional cooperation in the 21st century, and the issue of cross-border cooperation has attracted much academic attention. As the largest regional integration organization with the highest level in the world, EU takes the lead in practicing regional integration in the process of economic globalization. Europe's cross-border governance has been paid attention in a long time in economic geography and political geography, and a large number of theoretical and empirical research results have been achieved on issues such as border cooperation model and cross-border governance mechanism. The development experience of EU provides rich theoretical and practical experience for the collaborative governance in the Guangdong-Hong Kong-Macao Greater Bay Area, as the two also involve the collaboration across institutional boundaries and power restructuring. Therefore, the analysis of EU cross-border cooperation is of great significance to promote Guangdong-Hong Kong-Macao coordination. Based on the bibliometric analysis of Citespace, this paper systematically studies the research trends of EU cross-border cooperation from 1993 to 2020. The study finds that: 1) EU cross-border cooperation research mainly focuses on border regional interaction, cross-border cooperation mode, cross-border cooperation field, cross-border cooperation barriers and other issues. The regional integration of Europe has promoted the transformation of border areas from marginal areas to the forefront of development, and gradually formed a cross-border governance model under the superposition of formal institutional arrangements and informal institutional arrangements. The field of cooperation involves economic cooperation, tourism, environmental governance, health and other fields. 2) The development of EU cross-border cooperation benefits from the political interaction and mutual trust between countries, formal and informal institutional coordination, and the expansion and deepening of the scope of cooperation. However, there are still deficiencies in bilateral differences, cross-border accessibility, immigration and security. 3) As the same cross-institutional border region, the practical experience of EU cross-border cooperation has important enlightenment for the collaborative governance in the Guangdong-Hong Kong-Macao Greater Bay Area. Value identity is the basis of cross-institutional cooperation in the Guangdong-Hong Kong-Macao Greater Bay Area. Inclusive and orderly institutional arrangements are conducive to reducing the shielding effect of cooperation boundaries. And the combination of multi-scale cooperation and multi-dimensional governance system will effectively improve the cooperation in border areas. [ABSTRACT FROM AUTHOR]

The dynamics of innovation in geographical space is closely related to the regional development trajectory. Evolutionary economic geography points out the path dependence characteristics of regional development, and emphasizes that the direction of regional development is rooted in the original industrial and technological structure characteristics. Therefore, the geographical pattern of technological innovation and the identification of its diversity characteristics are of significance to the realization of regional innovation and the evolution of industrial structure. From the perspective of strategic industry, this paper aims to reveal the geographical pattern and diversity characteristics of technological innovation in strategic industry in the Guangdong-Hong Kong-Macao Greater Bay Area (GBA). Based on the point scale spatial data of invention patents in the GBA and by means of connecting strategic industry with national economy industry classification code and patent IPC classification code, the invention patents of six major industries in the GBA are extracted, which are the new generation of electronic information industry, automobile industry, green petrochemical industry, new energy industry, advanced material industry and intelligent robot industry. And the nuclear density analysis, standard deviation tail value test, entropy method and average nearest neighbor distance analysis are used to identify the spatial distribution characteristics and differences of multiple types of technological innovation in the GBA. The results show that the geographic pattern of technological innovation in the GBA presents a significant spatial imbalance. At the regional scale, Guangzhou and Shenzhen are the two agglomeration cores. There is a large gap in the innovation ability between the east and west sides of the Pearl River. The accumulation of technological innovation on the east bank is much higher than that on the west bank. The innovation profile line on the east bank has formed two obvious peaks in Guangzhou and Shenzhen. The high value of the innovation profile line on the west bank is mainly concentrated in Guangzhou and Zhuhai, and the peak value is far lower than that on the east bank. The location of technological diversity is mainly distributed in the core areas of the GBA, mainly including Yuexiu District and Tianhe District in Guangzhou, Nanshan District and Futian District in Shenzhen, Binhai District in Dongguan and Xiangzhou District in Zhuhai. And the distribution characteristics of technological innovation data of different industrial types are different. The innovation of the new generation of electronic information industry, advanced materials industry and green petrochemical industry accounts for 51.67% of the total innovation in the GBA. The innovation of different technological types shows obvious spatial differentiation. The innovation agglomeration degree of the new generation electronic information industry is the highest, with the R value of 0.0576. And its observed value of the average nearest neighbor distance between invention patents is 32.03 m, which belongs to the minimum value in the selected analysis industries, showing strong agglomeration characteristics. There are differences in the distribution characteristics of the agglomeration core of the six major industries in the GBA. The common ground is that they have formed the largest two agglomeration cores in the core areas of Guangzhou and Shenzhen, covering Yuexiu-Tianhe area in Guangzhou and Futian-Nanshan-Luohu area in Shenzhen. And the spatial distribution is mainly concentrated in the core areas of Guangzhou, Shenzhen, Dongguan and Zhuhai. Among them, the spatial agglomeration degree of the new generation of electronic information industry innovation is the highest. Agglomeration and multi-dimensional proximity, diversity and path dependence are the main mechanisms for the formation of the geographical pattern of technological innovation in the GBA, and these two key mechanisms promote the formation of current multi-type technological innovation space in the GBA. [ABSTRACT FROM AUTHOR]

Copyright of Tropical Geography is the property of Tropical Geography Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Shipin Kexue/ Food Science is the property of Food Science Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Advances in New & Renewable Energy is the property of Editorial Office of Advances in New & Renewable Energy and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Prataculturae Sinica is the property of Acta Prataculturae Sinica Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objective To investigate the isothermal amplification approach targeting repetitive DNA sequences using ordinary primers being not able to fold into designated secondary structures.Then the novel approach was utilized to detect Mycobacterium tuberculosis（Mtb）. Methods Isothermal amplification was applied using synthesized repetitive DNA sequence or extracted bacteria genomic DNA as templates， and using Bst 2.0 WarmStart DNA as DNA polymerase.The DNA products were detected via agarose gel electrophoresis. Results Synthesized repetitive DNA sequence could be isothermally amplified using its sequence-specific ordinary primers.Subsequently，primers（i.e.Ⅱ_MIRU-F/Ⅱ_MIRU-R）targeting type Ⅱ mycobacterial interspersed repetitive units（MIRUs）of Mtb H37Rv were designed.Primer pair Ⅱ_MIRUF/Ⅱ_MIRU-R or single primer Ⅱ_MIRU-F could amplify Mtb H37Rv genomic DNA isothermally. Ⅱ_MIRU-F could amplify Mtb with high specificity，after comparing its performances among non mycobacteria strains，non-tuberculous mycobacteria strains，Mtb complex strains，and Mtb clinical isolates. Ⅱ_MIRU-F had high limit of detection against Mtb H37Rv genomic DNA，and couldn’t specifically distinguish Mtb-positive sputum samples and Mtb-negative sputum samples. Conclusion Repetitive DNA sequences（including Mtb type Ⅱ MIRUs）could be isothermally amplified；Ⅱ_MIRU-F（specific to Mtb type Ⅱ MIRUs）does not suit to be utilized to test sputum samples. [ABSTRACT FROM AUTHOR]

Copyright of Journal of China University of Petroleum is the property of China University of Petroleum and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Debris flow is a common geological disaster in China, the average velocity of debris flow is one of the important parameters for the prevention and control of debris flow disaster. Predicting the average velocity of debris flow accurately has a great significance for disaster prevention. In this paper, a prediction model is built for average velocity of Jiangjiagou debris flow based on relevance vector machine. The prediction accuracy of the model is verified by comparing the prediction results with the model based on support vector machine and BP neural network. Average relative error and mean square error are used to evaluate the whole performance and stability of each model. The results show that compared with the measured values, the maximum relative error of relevance vector machine prediction is only 2.02%, the average relative error is 0.64%, the mean square error is 0.06, far lower than the BP neural network model and the support vector machine model prediction results. In conclusion, the prediction model based on relevance vector machine proposed in this paper is obviously better than the other two models. The prediction results are more accurate while the model is more stable, so the relevance vector machine provides a new way to obtain the average velocity of debris flow. [ABSTRACT FROM AUTHOR]

With the continuous improvement of the scale of breeding, the deterioration of water resources and environmental pollution, the breeding model needs to be transformed into an efficient and sustainable direction. The industrial farming system has the advantages of short culturing period and high yield per unit area. However, due to the large amount of solid wastes generated with high density of industrial farming, the removal of large particles of suspended solids in water is the primary task of waste treatment. As a centrifugal separation device, the cyclone separator has been widely used in petrochemical, sewage treatment and other industries. In order to explore the separation effect of solid-liquid cyclone separation device on aquaculture water, the computational fluid dynamics (CFD) method was used to simulate the flow characteristics of the cyclone separation device. At first, hybrid meshing of the cyclone separation device model was finished using the pre-processing software Gambit 2.4.6. In order to improve the accuracy of simulation, the mesh of inlet, overflow port and bottom flow port were all encrypted. The grid independent validation was done to choose the acceptable mesh. The inlet of the cyclone device was set as the velocity inlet, and the bottom flow port and the overflow port were set as pressure outlets. At last, the mesh was imported in Fluent software to analyze the effects of different inlet flow rates and different inlet concentrations on solid-liquid separation performance. In this simulation, the coupling of velocity field and pressure field was achieved by a semi-implicit method in the pressure correction method. First-order upwind difference scheme of convection motion was selected for the interpolation method of the diffusion term, the source term and the convection term. And the wall surface region was treated by the standard wall function. In order to compare the flow field distribution characteristics under different parameters, X=0 of the longitudinal section at 1/2 of the overflow pipe was set as the flow field monitoring surface, furthermore, 1/4 of the cone section and 2/3 of the column section on the monitoring surface were taken as the flow field monitoring lines. The simulation results show that as the inlet flow rate increases, the low-speed area in the middle of the cylinder reduces, and the area of the outer swirling area increases. Moreover, fluid velocity inside the separation device increases, and the turbulent flow increases, which is detrimental to the sedimentation of solid particles. Increasing the inlet concentration will increase the amount of particles in the cylinder and the interaction between particles is enhanced. In addition, the fluid velocity in the cylinder decreases, and the concentration of particles retained in the cylinder increases, which reduce the solid-liquid separation efficiency. The increase of the inlet flow and the inlet concentration leads to a decrease in separation efficiency of particles with different particle sizes. And the larger the particle size, the more significant the separation efficiency decreases. According to the comparison between simulation results and experimental data, the simulation error is less than 10%, and the simulation results are trustworthy. This study can provide a reference for the application of cyclone separation devices in aquaculture. [ABSTRACT FROM AUTHOR]

Objective To explore the protective mechanism of remote ischemic preconditioning（RIPC） on neurological function in patients undergoing craniotomy and clipping of aneurysms by observing the changes of serum neuron-specific enolase（NSE）, S100β protein and neuroglobin（NGB） levels in patients with left upper-limb ischemic preconditioning. Methods Sixty patients scheduled for elective craniotomy and clipping of aneurysms under general anesthesia were randomly divided into the group R and group C. Patients in the group R received three cycles of left upper-limb 5 min ischemic treatment（blood-pressure cuff inflation to ≥200 mmHg） and 5 min reperfusion（blood-pressure cuff deflation to 0 mmHg） at 10 min after intubation before the craniotomy and clipping of aneurysms. In the group C, the cuff was placed around the arm but not inflated. The blood samples were taken prior to the preconditioning procedures（T0）, immediate aneurysm clipping（T1）, at 0, 6, 24 h(T2-4) after the operation from the vein. The serum NSE, S100β protein, and NGB levels were detected by ELISA. The operation time, anesthesia time, propofol and remifentanil dosage, bleeding volume and length of hospital stay were recorded. The postoperative complications and modified Rankin score（mRS） at 3 months after surgery between two groups were followed up. Results There was no significant difference in the operation time, anesthesia time, propofol and remifentanil dosage, bleeding volume, and length of hospital stay between the two groups（all P>0.05）. Compared with T0, NSE levels decreased at T3 and T4, and NGB levels increased at T2-4 in the two groups. The levels of S100β protein in the group C and group R decreased at T1-4 and T2-4, respectively（all P<0.05）. Compared with the group C, the NGB levels in the group R increased at T3 and T4（P<0.05）. There was no significant difference in the serum NSE, S100β protein levels, postoperative complication rate or mRS score at 3 months after surgery（all P>0.05）. Conclusion RIPC has no effect on serum NSE and S100β protein levels in patients undergoing craniotomy and clipping of aneurysms, but it can promote the increase of NGB level. It may protect the neurological function of patients by increasing the level of NGB. [ABSTRACT FROM AUTHOR]

Copyright of Journal of China University of Petroleum is the property of China University of Petroleum and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Nanjing Normal University / Nanjing Shi Da Xue Bao (She Hui Ke Xue Ban) is the property of Nanjing Shifan Daxue and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Computer Measurement & Control is the property of Magazine Agency of Computer Measurement & Control and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of China University of Petroleum is the property of China University of Petroleum and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The grafting and cultivation of Cucurbitaceous vegetables are characterized by the strong root system, heat resistance, disease resistance and good absorbing ability for soil fertility. Oblique grafting is a common method for Cucurbitaceous vegetables. The pressing and clamping of the stock cotyledons is one of the important issues to be considered in the design of oblique inserted grafting machine. According to the problem that the existing Cucurbitaceous vegetable grafting machine easy to break the petiole of cotyledons or damage the cotyledons in the process of cotyledons pressing, the stock cotyledons pressing and clamping mechanism used in Cucurbitaceous vegetable grafting was designed and developed by measuring the characteristic parameters of the cotyledons and by adding an imitation blocks on the cross clamp mechanism designed by the author before to adapt to the morphological characteristics of the stock cotyledons. The shape of the imitation blocks in the pressing and clamping mechanism was close to the natural shape of the cotyledons in order to prevent the breaking of the cotyledon. In the process of pressing the cotyledon, the pressing roll of the pressing and clamping mechanism could automatically slip on the imitation blocks to realize the automatic adjustment of the compression force and to avoid the damage of cotyledon. Then the growth point removal mechanism designed by the authors was used to successfully remove the growth point of rootstock seedlings. Through the force analysis of the pressing and clamping mechanism, it could be seen that the supporting force of the cotyledon to the pressing rod was getting smaller and smaller when the pressing rod rolled from middle to outside on the imitation blocks. That is, the pressing mechanism could automatically adjust the force on the cotyledon and prevent the cotyledon surface damage. At the same time, the pressing rod could extend the cotyledons to outside making the growth point fully exposed and convenient to be removed. The stock cotyledon pressing tests on 60 cucurbit seedlings were carried out by using the self-adaptive pressing and clamping mechanism and compared with that of without imitation blocks. The results showed that the success rate of the stock cotyledon pressing and clamping mechanism with the imitation blocks was 100%. It was also found that cotyledons could easily be broken by using the pressing and clamping mechanism without imitation blocks, and the breaking rate of cotyledons was 13.3%, but cotyledons was totally not broken by using the pressing and clamping with imitation blocks in the same condition. The damage rate of cotyledons surface was 21.6% by using the mechanism without imitation blocks, but it was totally not damaged by using the mechanism with imitation blocks in the same condition. The growth point of stock could easily be removed by using the mechanism with imitation blocks, and the remove rate of growth point was 98.3% , while it was only 16.7% by using the mechanism without imitation blocks. It indicated that the design of the stock cotyledon pressing and clamping mechanism with the imitation blocks was reasonable. It can better meet the requirements of the grafting and cultivation of Cucurbitaceous vegetables. The study provides a design reference for solving the problems on pressing cotyledons in the process of Cucurbitaceous vegetable grafting. [ABSTRACT FROM AUTHOR]

Copyright of Natural Gas Industry is the property of Natural Gas Industry Journal Agency and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Nursing of Integrated Traditional Chinese & Western Medicine is the property of Journal of Clinical Nursing in Practice (Editorial Board, Shanghai Jiao Tong University Press) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Clinical Hepatology / Linchuang Gandanbing Zazhi is the property of Journal of Clinical Hepatology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Petroleum Geology & Recovery Efficiency is the property of Petroleum Geology & Recovery Efficiency and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In China, corn harvest gradually tends to mechanization, and corn threshing is the most important section in the process of corn harvest, which is directly affecting the damage level of corn seed. Manual threshing often chips away a row of corn ear with an awl firstly, and then it’s easy to thresh other kernels. Based on this, some agricultural experts put forward a process of “pre-dispersion and post-threshing”. Besides, the study found that after the long-term evolution, beak has not only excellent ability to insert into corn kernels, but also strong ability of dispersing kernels with low damage. To explore the movement law of corn ear kernels and low damage in the discrete process of corn ear, this paper had an experimental study on the beak to peck the corn kernel using the discrete test system with high-speed photography. The variety of experimental corn was Zhengdan 958 and the common domestic chicken was selected for testing. Self-made corn discrete test system was used in this experiment. The whole system consisted of mechanical data acquisition system and high-speed photography system. Due to the randomness of chicken pecking corn, firstly, the high-speed camera was fixed to the bracket, and then the best angle was selected to shoot at the beginning of discrete process. The shooting in the test was mainly from the ahead, the side and the back side of the test equipment with the shooting angle of 45°. The sensors were installed on the fixture to measure the forces in 3 directions respectively. Through observing the photos, we found that the closer the kernel was from beak, the larger the horizontal component of thrust was, the more obvious the movement was, and the easier kernel was to disperse from ear; on the contrary, the further the kernel was from beak, the smaller the horizontal component of thrust was, and the more difficult kernel was to disperse from ear. The kernels followed the “arrangement law” to deliver forces, whose range was approximate to a “tower”, and the movement of kernel separated from corn ear was similar to oblique throwing movement. According to the data measured, the maximum force on the corn ear was in x direction, second in y direction, and the force in z direction was the minimum. The resultant force of x and y direction had a great influence on the number of the kernels separated from the corn ear. The results of verification test were that the average discrete rate was 67.53% and the damage rate was 0.16%, which showed that the beak had a significant effect on dispersing corn ear, and the damage rate was low. The study will provide a bionic thought on designing corn threshing system with low damage [ABSTRACT FROM AUTHOR]

Copyright of Journal of Nanjing Normal University / Nanjing Shi Da Xue Bao (She Hui Ke Xue Ban) is the property of Nanjing Shifan Daxue and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)