Psidium guajava fruits are consumed fresh or processed (beverages, syrup, ice cream, jams and jellies). Guayaba is a fruit highly perishable and susceptible to damage during the postharvest. One strategy to overcome t...Psidium guajava fruits are consumed fresh or processed (beverages, syrup, ice cream, jams and jellies). Guayaba is a fruit highly perishable and susceptible to damage during the postharvest. One strategy to overcome this problem is its processing by using techniques that preserve its organoleptic, nutritive and functional properties and allow getting food with added value. The purpose of this study was to obtain flour from fresh fruits cultivated in Argentina Northwestern by lyophilization and to determine the antioxidant activity and the main phytochemicals present in fresh fruits and flour. Nutritional composition (sugar, protein and fat) and the bioactive phytochemicals (total phenolic compounds, flavonoid phenolic, condensed and hydrolizable tannin, ascorbic acid, pigments such as anthocyanin and carotenoids) as well as fiber content, were evaluated. The flour preserved flavor, aroma and color of pulp from fresh fruits. The flour contained around 30% of sugar, 20% of total protein, 0.5% of fat and high level of crude fiber. Carotenoids and ascorbic acid were the dominant phytochemicals in flour as well as in fresh fruits. The guayaba flour showed antioxidant activity with SC50 values similar to fresh fruits. The flour showed nutraceutical characteristics that are demanded by functional food and could be used as a dietary supplement.展开更多
Most previous studies have investigated country-of-origin effect for agricultural products from the economically developed country, but few have focused on the impact of country-of-origin on agricultural products from...Most previous studies have investigated country-of-origin effect for agricultural products from the economically developed country, but few have focused on the impact of country-of-origin on agricultural products from economically developing countries. Using a national online survey in France, we determine French consumers＇ perceptions and preferences for fresh fruit from China. Results of ordered logit models show that fresh fruit from China was perceived as low quality and unsafe. Respondents who care about country-of-origin were less likely to purchase fresh fruit from China, while those who care about brand were more likely to buy Chinese fresh fruit. Risk perception and quality perception both had a significant impact on the purchase of Chinese fresh fruit. Results of latent class models obtained with key consumer demographics show that heterogeneous preferences exist among different consumer groups. The results provide critical information to both China and other economically developing countries in their efforts to improve market penetration in economically developed countries.展开更多
Based on perceived risk,the impacts of different kinds of risks on consumer's purchase intention are tested by using the investigation data of 2016,and perceived risks of consumers from different groups have diffe...Based on perceived risk,the impacts of different kinds of risks on consumer's purchase intention are tested by using the investigation data of 2016,and perceived risks of consumers from different groups have different impacts on purchase intention. Via interviews and online questionnaires,425 copies of effective samples were obtained. The structural equation modeling is used for research. Results display that product risk significantly affects purchase intention,and perceived risk among different groups has significant difference. According to research conclusion,the authors think that consumer should actively collect all kinds of information and take effective risk avoidance measures; Taobao platform should continuously perfect purchase rule,punish the behavior of leaking buyers' information,and continuously update Alipay software to prevent hacker intrusion; business should guarantee product quality,open information and make scientific marketing strategy.展开更多
[ Objective] The content of total antimony （Sb） in fresh fruit was investigated and its pollution was evaluated, to provide the basic data for diet exposure evaluation. [ Method] The content of total Sb in 194 sampl...[ Objective] The content of total antimony （Sb） in fresh fruit was investigated and its pollution was evaluated, to provide the basic data for diet exposure evaluation. [ Method] The content of total Sb in 194 samples was detected by hydride generation-atomic fluorescence spectrometry （HG-AFS）, and the Sb pollution in several fruits was evaluated by the method of single factor pollution index. [ Result ] The mean of total Sb was 0. 005 6 mg/kg, and the median was 0.003 8 mg/kg. The minimum value was not detected while the maximum value was O. 21 mg/kg, and the confidence interval was ND-O. 019 mg/kg （PS-P95）. The medi- ans of total Sb content in different fruits successively were dragon fruit （0.011 0 mg/kg） 〉 kiwi fruit （0.008 0 mg/kg） 〉 peach （0.006 0 mg/kg）. According to the method of single factor pollution index, the index from all samples was less than 0.2, suggesting that the samples involved were under the normal background value. [ Conclusion ] The Sb was detected in all samples but under the background value, and it was concluded that there was no Sb pollution in fresh fruit in Hunan Province.展开更多
[Objectives]This study was conducted to clarify the differences of volatile components in fresh fruit of Morinda citrifolia L.from different origins.[Methods]The method of HS-SPME-GC/MS detection was used to determine...[Objectives]This study was conducted to clarify the differences of volatile components in fresh fruit of Morinda citrifolia L.from different origins.[Methods]The method of HS-SPME-GC/MS detection was used to determine the volatile chemical components in fresh fruit of M.citrifolia.[Results]52,52 and 45 volatile components were identified from the fresh fruit of M.citrifolia from Xisha,Wanning and Haikou,respectively.Among them,the number and content of the identified esters were relatively high,mainly methyl caprylate,ethyl caprylate,4-pentenyl caproate,3-methylbuten-2-enyl caprylate,methyl caproate,and ethyl caproate.There were also fatty acids,alcohols,phenols,ketones,aldehydes and other substances.There were 33 common ingredients in the fruit from the three origins,mainly including caprylic acid,caproic acid,capric acid,methyl caprylate,ethyl caprylate,4-pentenyl caproate,3-methylbutene-2-enyl caprylate,methyl caproate,ethyl caproate,methyl caprate and hexyl caproate.[Conclusions]The types and contents of volatile components in fresh fruit of M.citrifolia from different origins were significantly different.展开更多
Robot technology is a very promising technology for agricultural sector, but the existing industrial robot could not deliver the above-mentioned criteria. Industrial robot mainly uses high voltage electrical power, wh...Robot technology is a very promising technology for agricultural sector, but the existing industrial robot could not deliver the above-mentioned criteria. Industrial robot mainly uses high voltage electrical power, which is not available at field and outdoor operation. The only available and reliable power is a hydraulic from the tractor. The harvester robot consumes the hydraulic power from the tractor and at the same time the tractor can be used as a traveling device for the robot. This paper describes the study on the development of autonomous tractor for the oil palm harvester. The development took considerations on the design of the electro-hydraulic system and the control software for the robot structure to be flexible enough to operate in plantation environment.展开更多
Fresh Lycium barbarum L.(L.barbarum)fruits are renowned for their exceptionally high nutritional value and health benefits,which is leading to an increasing demand among consumers.However,the quality testing and gradi...Fresh Lycium barbarum L.(L.barbarum)fruits are renowned for their exceptionally high nutritional value and health benefits,which is leading to an increasing demand among consumers.However,the quality testing and grading of fresh L.barbarum fruits present significant challenges that hinder the growth of the L.barbarum industry.In this study,an electrical characterization method is used to analyze the variations in electrical parameters of fresh L.barbarum fruits under different degrees of damage.Optimal testing conditions for eight electrical parameters are determined,and principal component analysis(PCA)along with partial least squares(PLS)is applied to reduce data dimensionality and extract key features.Subsequently,damage degree discrimination models are developed using the support vector machine(SVM),random forest(RF),and convolutional neural network(CNN).The experimental results indicate that the PLS-RF model was the most effective,achieving discrimination accuracies of 99.48%and 91.25%in the training and test sets,respectively.The aim of this study is to validate the feasibility of using electrical characteristics to differentiate the degree of fruit damage and it establishes a reliable model for assessing damage extent in L.barbarum fruits.This innovative approach not only provides a novel method for evaluating fruit damage but may also serve as a theoretical basis for the development of mechanical harvesting equipment for L.barbarum fruits.展开更多
The oil palm leaf miner, Coelaenomenodera lameensis, is currently the most destructive pest of oil palm in Ghana and other African oil palm growing countries, causing significant losses in fresh fruit bunch yield. Pro...The oil palm leaf miner, Coelaenomenodera lameensis, is currently the most destructive pest of oil palm in Ghana and other African oil palm growing countries, causing significant losses in fresh fruit bunch yield. Progressive pruning is an oil palm pruning method in which pruning is done at the same time as fresh fruit bunch harvesting. This study evaluated the impact of progressive pruning on leaf miner population in oil palm and how these two factors (leaf miner and progressive pruning) affect the yield of oil palm at the Benso Oil Palm Plantation Public listed company (BOPP. Plc). Five distinct blocks in the plantation were selected for observations on fronds at various ranks (33, 25, or 17) based on the degree of defoliation by counting the number of pests on leaflets at different phases of insect development. Fronds from selected plots were sampled in a Completely Randomized Design (CRD). The size of plots used for the study ranged between 19 to 45 hectares. A minimum of 78 fronds were evenly cut from each block for pest count depending on the block size. Secondary data on annual yields of fresh fruit bunches before and after the introduction of progressive pruning were also obtained from BOPP. Plc records from 2011-2020. The results from the analyzed data on leaf miner index before and after the introduction of progressive pruning showed that progressive pruning has, to a high extent (64% to 36%), reduced leaf miner populations in the plantation. Paired t-test on fresh fruit bunch yield has also revealed a significant (p < 0.001) increase in annual fresh fruit bunch yield due to progressive pruning. A regression analysis, however, revealed a lower rate of yield loss (3.05 to 2.70 tonnes) to leaf miner infestation after the introduction of progressive pruning. The study recommends progressive pruning as a key cultural practice for improving crop yields in leaf miner prone plantations.展开更多
To the Editor:Diabetes,which is a rapidly growing global health concern,is prevalent in 12.4%of adults in China.[1]People with diabetes usually limit fruit intake to maintain blood glucose concentrations.However,there...To the Editor:Diabetes,which is a rapidly growing global health concern,is prevalent in 12.4%of adults in China.[1]People with diabetes usually limit fruit intake to maintain blood glucose concentrations.However,there has been limited research on the effect of the frequency of fresh fruit intake on the incidence of cardiovascular events and mortality in patients with diabetes.This gap in knowledge extends to understanding the optimal level of fruit consumption for cardiovascular risk reduction and its variability across patient subgroups and event subtypes.We used a prospective cohort design to investigate the association between the frequency of fresh fruit intake and the risk of cardiovascular events,including ischemic heart disease and stroke,in patients with diabetes.We also examined potential differences in this relationship across various subgroups of individuals with diabetes.展开更多
The existing mechanized oil palm harvester is claimed to be unsuccessful due to its inefficiency to harvest Fresh Fruit Bunch(FFB).It takes a lot of time compared to the conventional harvesting method,using human powe...The existing mechanized oil palm harvester is claimed to be unsuccessful due to its inefficiency to harvest Fresh Fruit Bunch(FFB).It takes a lot of time compared to the conventional harvesting method,using human power.Therefore a study was carried out using Denavit and Hartenberg(D-H)approach to automate the five Degrees of Freedom(DOF)harvester manipulator.The general objective was to reduce the number of workers required for harvesting as well as to provide comfortable ergonomic for the operator of oil palm harvester.The D-H’s convention was used for selecting frames of reference in robotics application which has become the standard way of representing robots and modeling their motions.In this study,the forward kinematics and inverse kinematics were used to deduce joint angles variables while the conventional Jacobian was used for motion velocity computation.The formulated inverse equations were tested manually on the harvester with given locations to obtain deduced joint angles.The results were θ_(1)=129.64°,θ_(3)=180°,θ_(4)=90°,which were quite accurate.Thus,the kinematics analysis of harvester arm automation was done successfully.展开更多
Background:Existing evidence suggests that fruit consumption is a significant influencing factor for chronic obstructive pulmonary disease(COPD),but this is unclear in the Chinese population.We examined the associatio...Background:Existing evidence suggests that fruit consumption is a significant influencing factor for chronic obstructive pulmonary disease(COPD),but this is unclear in the Chinese population.We examined the association of fresh fruit consumption with the risk of COPD-related hospitalization and death in a nationwide,population-based prospective cohort from China.Methods:Between 2004 and 2008,the China Kadoorie Biobank recruited>0.5 million adults aged 30 to 79 years from ten diverse regions across China.After excluding individuals diagnosed with major chronic diseases and prevalent COPD,the prospective analysis included 421,428 participants.Cox regression was used to calculate the hazard ratios(HRs)for the association between fresh fruit consumption and risk of COPD-related hospitalization and death,with adjustment for established and potential confounders.Results:During a mean follow-up of 10.9 years,11,292 COPD hospitalization events and deaths were documented,with an overall incidence rate of 2.47/1000 person-years.Participants who consumed fresh fruit daily had a 22%lower risk of COPD-related hospitalization and death compared with non-consumers(HR=0.78,95%confidence interval[CI]:0.71-0.87).The inverse association between fresh fruit consumption and COPD-related hospitalization and death was stronger among non-current smokers and participants with normal body mass index(BMI)(18.5 kg/m^(2)≤BMI<24.0 kg/m^(2));the corresponding HRs for daily fresh fruit consumption were 0.78(95%CI:0.68-0.89)and 0.69(95%CI:0.59-0.79)compared with their counterparts,respectively.Conclusions:High-frequency fruit consumption was associated with a lower risk of COPD in Chinese adults.Increasing fruit consumption,together with cigarette cessation and weight control,should be considered in the prevention and management of COPD.展开更多
Metabolism,transpiration,and invasion of pathogens during the storage and transportation of fruits can lead to significant waste and even food safety issues.Therefore,real-time,rapid,and accurate non-destructive monit...Metabolism,transpiration,and invasion of pathogens during the storage and transportation of fruits can lead to significant waste and even food safety issues.Therefore,real-time,rapid,and accurate non-destructive monitoring of physiological information during the storage of fruits and vegetables to assess fruit freshness is crucial.Herein,we engineered a degradable and multifunctional humidity sensing film for monitoring fruit freshness.The film is fabricated through the co-assembly of bagasse cellulose nanocrystals(CNC),okra polysaccharides(OPs),silver nanowires(Ag NWs),and phytic acid(PA),utilizing dynamic hydrogen and phosphate bonds.This innovative design endows the CNC/OPs/PA/Ag NWs(COPA)composite film with outstanding mechanical properties,water resistance,low water vapor permeability,antibacterial,degradability,and moisture-sensing ability.Notably,the proposed COPA humidity sensor exhibits high linearity(R^(2)=0.994),ultralow hysteresis(1.24%),and 32 days of operational stability across a 35%–98%relative humidity(RH)range,enabling precise freshness monitoring during fruit storage.Significantly,the COPA film prolonged the shelf-life of packaged fruit when compared to conventional PE film packaging.This research establishes a foundational framework for next-generation smart sensors in food quality management and biomedical monitoring applications.展开更多
基金the financial support from Consejo de Investigación de la Universidad Nacional de Tucumán(CIUNT 26 D-430)Argentina,Consejo Nacional de Investigaciones Científicas y Técnicas(CONICET PIP-704)Argentina and Agencia Nacional de Promoción Científica y Técnica(ANPCyT,PICT 1959).
文摘Psidium guajava fruits are consumed fresh or processed (beverages, syrup, ice cream, jams and jellies). Guayaba is a fruit highly perishable and susceptible to damage during the postharvest. One strategy to overcome this problem is its processing by using techniques that preserve its organoleptic, nutritive and functional properties and allow getting food with added value. The purpose of this study was to obtain flour from fresh fruits cultivated in Argentina Northwestern by lyophilization and to determine the antioxidant activity and the main phytochemicals present in fresh fruits and flour. Nutritional composition (sugar, protein and fat) and the bioactive phytochemicals (total phenolic compounds, flavonoid phenolic, condensed and hydrolizable tannin, ascorbic acid, pigments such as anthocyanin and carotenoids) as well as fiber content, were evaluated. The flour preserved flavor, aroma and color of pulp from fresh fruits. The flour contained around 30% of sugar, 20% of total protein, 0.5% of fat and high level of crude fiber. Carotenoids and ascorbic acid were the dominant phytochemicals in flour as well as in fresh fruits. The guayaba flour showed antioxidant activity with SC50 values similar to fresh fruits. The flour showed nutraceutical characteristics that are demanded by functional food and could be used as a dietary supplement.
基金supported by the USDA (United States Department of Agriculture) National Institute of Food and Agriculture (NIFA) (Hatch project FLA-FRE-005292)supported by the China Scholarship Council,the Humanities +1 种基金Social Science Fund of the Ministry of Education of China (13YJC790138)the Jiangsu University Philosophy and Social Science Fund,China (2017SJB0191)
文摘Most previous studies have investigated country-of-origin effect for agricultural products from the economically developed country, but few have focused on the impact of country-of-origin on agricultural products from economically developing countries. Using a national online survey in France, we determine French consumers＇ perceptions and preferences for fresh fruit from China. Results of ordered logit models show that fresh fruit from China was perceived as low quality and unsafe. Respondents who care about country-of-origin were less likely to purchase fresh fruit from China, while those who care about brand were more likely to buy Chinese fresh fruit. Risk perception and quality perception both had a significant impact on the purchase of Chinese fresh fruit. Results of latent class models obtained with key consumer demographics show that heterogeneous preferences exist among different consumer groups. The results provide critical information to both China and other economically developing countries in their efforts to improve market penetration in economically developed countries.
文摘Based on perceived risk,the impacts of different kinds of risks on consumer's purchase intention are tested by using the investigation data of 2016,and perceived risks of consumers from different groups have different impacts on purchase intention. Via interviews and online questionnaires,425 copies of effective samples were obtained. The structural equation modeling is used for research. Results display that product risk significantly affects purchase intention,and perceived risk among different groups has significant difference. According to research conclusion,the authors think that consumer should actively collect all kinds of information and take effective risk avoidance measures; Taobao platform should continuously perfect purchase rule,punish the behavior of leaking buyers' information,and continuously update Alipay software to prevent hacker intrusion; business should guarantee product quality,open information and make scientific marketing strategy.
基金Supported by Scientific Research Project of Medicine and Health Care in Hunan Province(B2014-162)Scientific Research Project of Xiangtan Science and Technology Bureau(SF20141003)
文摘[ Objective] The content of total antimony （Sb） in fresh fruit was investigated and its pollution was evaluated, to provide the basic data for diet exposure evaluation. [ Method] The content of total Sb in 194 samples was detected by hydride generation-atomic fluorescence spectrometry （HG-AFS）, and the Sb pollution in several fruits was evaluated by the method of single factor pollution index. [ Result ] The mean of total Sb was 0. 005 6 mg/kg, and the median was 0.003 8 mg/kg. The minimum value was not detected while the maximum value was O. 21 mg/kg, and the confidence interval was ND-O. 019 mg/kg （PS-P95）. The medi- ans of total Sb content in different fruits successively were dragon fruit （0.011 0 mg/kg） 〉 kiwi fruit （0.008 0 mg/kg） 〉 peach （0.006 0 mg/kg）. According to the method of single factor pollution index, the index from all samples was less than 0.2, suggesting that the samples involved were under the normal background value. [ Conclusion ] The Sb was detected in all samples but under the background value, and it was concluded that there was no Sb pollution in fresh fruit in Hunan Province.
基金Supported by Hainan Province Basic and Applied Basic Research Program(Natural Science)High-level Talents(No.2019RC318)Nanfeng Special Phase III:Investigation and Protection of Cultivated Land and Fishery Water Resources(NFZX2021)the Central Public-interest Scientific Institution Basal Research Fund for Chinese Academy of Tropical Agricultural Sciences(No.1630032022022)。
文摘[Objectives]This study was conducted to clarify the differences of volatile components in fresh fruit of Morinda citrifolia L.from different origins.[Methods]The method of HS-SPME-GC/MS detection was used to determine the volatile chemical components in fresh fruit of M.citrifolia.[Results]52,52 and 45 volatile components were identified from the fresh fruit of M.citrifolia from Xisha,Wanning and Haikou,respectively.Among them,the number and content of the identified esters were relatively high,mainly methyl caprylate,ethyl caprylate,4-pentenyl caproate,3-methylbuten-2-enyl caprylate,methyl caproate,and ethyl caproate.There were also fatty acids,alcohols,phenols,ketones,aldehydes and other substances.There were 33 common ingredients in the fruit from the three origins,mainly including caprylic acid,caproic acid,capric acid,methyl caprylate,ethyl caprylate,4-pentenyl caproate,3-methylbutene-2-enyl caprylate,methyl caproate,ethyl caproate,methyl caprate and hexyl caproate.[Conclusions]The types and contents of volatile components in fresh fruit of M.citrifolia from different origins were significantly different.
文摘Robot technology is a very promising technology for agricultural sector, but the existing industrial robot could not deliver the above-mentioned criteria. Industrial robot mainly uses high voltage electrical power, which is not available at field and outdoor operation. The only available and reliable power is a hydraulic from the tractor. The harvester robot consumes the hydraulic power from the tractor and at the same time the tractor can be used as a traveling device for the robot. This paper describes the study on the development of autonomous tractor for the oil palm harvester. The development took considerations on the design of the electro-hydraulic system and the control software for the robot structure to be flexible enough to operate in plantation environment.
基金supported by the Autonomous Region Key Research and Development Plan Project[Grant No.2022BSB03064]the National Key Research and Development Program of China[grant number 2022YFD2202105-5]+1 种基金the National Natural Science Foundation of China[grant number 32260431]Science and Technology Major Projects of Autonomous Region[grant number 2022BBF01002].
文摘Fresh Lycium barbarum L.(L.barbarum)fruits are renowned for their exceptionally high nutritional value and health benefits,which is leading to an increasing demand among consumers.However,the quality testing and grading of fresh L.barbarum fruits present significant challenges that hinder the growth of the L.barbarum industry.In this study,an electrical characterization method is used to analyze the variations in electrical parameters of fresh L.barbarum fruits under different degrees of damage.Optimal testing conditions for eight electrical parameters are determined,and principal component analysis(PCA)along with partial least squares(PLS)is applied to reduce data dimensionality and extract key features.Subsequently,damage degree discrimination models are developed using the support vector machine(SVM),random forest(RF),and convolutional neural network(CNN).The experimental results indicate that the PLS-RF model was the most effective,achieving discrimination accuracies of 99.48%and 91.25%in the training and test sets,respectively.The aim of this study is to validate the feasibility of using electrical characteristics to differentiate the degree of fruit damage and it establishes a reliable model for assessing damage extent in L.barbarum fruits.This innovative approach not only provides a novel method for evaluating fruit damage but may also serve as a theoretical basis for the development of mechanical harvesting equipment for L.barbarum fruits.
文摘The oil palm leaf miner, Coelaenomenodera lameensis, is currently the most destructive pest of oil palm in Ghana and other African oil palm growing countries, causing significant losses in fresh fruit bunch yield. Progressive pruning is an oil palm pruning method in which pruning is done at the same time as fresh fruit bunch harvesting. This study evaluated the impact of progressive pruning on leaf miner population in oil palm and how these two factors (leaf miner and progressive pruning) affect the yield of oil palm at the Benso Oil Palm Plantation Public listed company (BOPP. Plc). Five distinct blocks in the plantation were selected for observations on fronds at various ranks (33, 25, or 17) based on the degree of defoliation by counting the number of pests on leaflets at different phases of insect development. Fronds from selected plots were sampled in a Completely Randomized Design (CRD). The size of plots used for the study ranged between 19 to 45 hectares. A minimum of 78 fronds were evenly cut from each block for pest count depending on the block size. Secondary data on annual yields of fresh fruit bunches before and after the introduction of progressive pruning were also obtained from BOPP. Plc records from 2011-2020. The results from the analyzed data on leaf miner index before and after the introduction of progressive pruning showed that progressive pruning has, to a high extent (64% to 36%), reduced leaf miner populations in the plantation. Paired t-test on fresh fruit bunch yield has also revealed a significant (p < 0.001) increase in annual fresh fruit bunch yield due to progressive pruning. A regression analysis, however, revealed a lower rate of yield loss (3.05 to 2.70 tonnes) to leaf miner infestation after the introduction of progressive pruning. The study recommends progressive pruning as a key cultural practice for improving crop yields in leaf miner prone plantations.
基金supported by the Fujian Province Pilot Project(No.2020Y0060)the Fujian Provincial Health Youth Project(No.2020QNB017)the Chinese Academy of Medical Sciences Innovation Fund for Medical Science(No.2021-I2M-1-011).
文摘To the Editor:Diabetes,which is a rapidly growing global health concern,is prevalent in 12.4%of adults in China.[1]People with diabetes usually limit fruit intake to maintain blood glucose concentrations.However,there has been limited research on the effect of the frequency of fresh fruit intake on the incidence of cardiovascular events and mortality in patients with diabetes.This gap in knowledge extends to understanding the optimal level of fruit consumption for cardiovascular risk reduction and its variability across patient subgroups and event subtypes.We used a prospective cohort design to investigate the association between the frequency of fresh fruit intake and the risk of cardiovascular events,including ischemic heart disease and stroke,in patients with diabetes.We also examined potential differences in this relationship across various subgroups of individuals with diabetes.
文摘The existing mechanized oil palm harvester is claimed to be unsuccessful due to its inefficiency to harvest Fresh Fruit Bunch(FFB).It takes a lot of time compared to the conventional harvesting method,using human power.Therefore a study was carried out using Denavit and Hartenberg(D-H)approach to automate the five Degrees of Freedom(DOF)harvester manipulator.The general objective was to reduce the number of workers required for harvesting as well as to provide comfortable ergonomic for the operator of oil palm harvester.The D-H’s convention was used for selecting frames of reference in robotics application which has become the standard way of representing robots and modeling their motions.In this study,the forward kinematics and inverse kinematics were used to deduce joint angles variables while the conventional Jacobian was used for motion velocity computation.The formulated inverse equations were tested manually on the harvester with given locations to obtain deduced joint angles.The results were θ_(1)=129.64°,θ_(3)=180°,θ_(4)=90°,which were quite accurate.Thus,the kinematics analysis of harvester arm automation was done successfully.
基金supported by grants from the National Key Research&Development Program of China(Nos.2016YFC0900500,2016YFC0900501,2016YFC0900504,and 2016YFC1303904)National Natural Science Foundation of China(Nos.81973125,81941018,91846303,and 91843302)
文摘Background:Existing evidence suggests that fruit consumption is a significant influencing factor for chronic obstructive pulmonary disease(COPD),but this is unclear in the Chinese population.We examined the association of fresh fruit consumption with the risk of COPD-related hospitalization and death in a nationwide,population-based prospective cohort from China.Methods:Between 2004 and 2008,the China Kadoorie Biobank recruited>0.5 million adults aged 30 to 79 years from ten diverse regions across China.After excluding individuals diagnosed with major chronic diseases and prevalent COPD,the prospective analysis included 421,428 participants.Cox regression was used to calculate the hazard ratios(HRs)for the association between fresh fruit consumption and risk of COPD-related hospitalization and death,with adjustment for established and potential confounders.Results:During a mean follow-up of 10.9 years,11,292 COPD hospitalization events and deaths were documented,with an overall incidence rate of 2.47/1000 person-years.Participants who consumed fresh fruit daily had a 22%lower risk of COPD-related hospitalization and death compared with non-consumers(HR=0.78,95%confidence interval[CI]:0.71-0.87).The inverse association between fresh fruit consumption and COPD-related hospitalization and death was stronger among non-current smokers and participants with normal body mass index(BMI)(18.5 kg/m^(2)≤BMI<24.0 kg/m^(2));the corresponding HRs for daily fresh fruit consumption were 0.78(95%CI:0.68-0.89)and 0.69(95%CI:0.59-0.79)compared with their counterparts,respectively.Conclusions:High-frequency fruit consumption was associated with a lower risk of COPD in Chinese adults.Increasing fruit consumption,together with cigarette cessation and weight control,should be considered in the prevention and management of COPD.
基金financial support provided by the National Natural Science Foundation of China(Nos.52363014 and 22405179)the Science and Technology Project of Guangxi(GK AB23026136)the Open Fund Funding of Key Laboratory of New Processing Technology for Nonferrous Metal&Materials,Ministry of Education/Guangxi Key Laboratory of Optical and Electronic Materials and Devics(22AA-7).
文摘Metabolism,transpiration,and invasion of pathogens during the storage and transportation of fruits can lead to significant waste and even food safety issues.Therefore,real-time,rapid,and accurate non-destructive monitoring of physiological information during the storage of fruits and vegetables to assess fruit freshness is crucial.Herein,we engineered a degradable and multifunctional humidity sensing film for monitoring fruit freshness.The film is fabricated through the co-assembly of bagasse cellulose nanocrystals(CNC),okra polysaccharides(OPs),silver nanowires(Ag NWs),and phytic acid(PA),utilizing dynamic hydrogen and phosphate bonds.This innovative design endows the CNC/OPs/PA/Ag NWs(COPA)composite film with outstanding mechanical properties,water resistance,low water vapor permeability,antibacterial,degradability,and moisture-sensing ability.Notably,the proposed COPA humidity sensor exhibits high linearity(R^(2)=0.994),ultralow hysteresis(1.24%),and 32 days of operational stability across a 35%–98%relative humidity(RH)range,enabling precise freshness monitoring during fruit storage.Significantly,the COPA film prolonged the shelf-life of packaged fruit when compared to conventional PE film packaging.This research establishes a foundational framework for next-generation smart sensors in food quality management and biomedical monitoring applications.
