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| 1 | Machining deformation of single-sided component based on finishing allowance optimization显示文摘Owing to reliability and high strength-to-weight ratio,large thin-walled components are widely used in the aviation and aerospace industry.Due to the complex features and sequence involved in the machining process of large thin-walled components,machining deformation of component is easy to exceed the specification.In order to address the problem,it is important to retain the appropriate finishing allowance.To find the overall machining deformation,finishing allowance-induced deformation(web finishing allowance,sidewall finishing allowance)and initial residual stress-induced deformation were considered as major factors.Meanwhile,machined surface residual stress-induced deformation,clamping stress-induced deformation,thermal deformation,gravity-induced deformation and inertial force-induced deformation were neglected in the optimization model.Six-peak Gaussian function was introduced to fit the initial residual stress.Based upon the obtained function of initial residual stress,a deformation prediction model between initial residual stress and finishing allowance was established to attain the finishing allowanceinduced deformation.In addition,linear programming optimization model based on the simplex algorithm was developed to optimize the overall machining deformation.Results have concluded that the overall machining deformation reached the minimum value when sidewall finishing allowance and web finishing allowance varied between 1 and 2 mm.Additionally,web finishing allowance-induced deformation and sidewall finishing allowance-induced deformation were1.05 mm and 0.7 mm.Furthermore,the machining deformation decreased to 0.3–0.38 mm with the application of optimized finishing allowance allocation strategy,which made 39–56%reduction of the overall machining deformation compared to that in conventional method. | Xiaoyue LI Liang LI Yinfei YANG Guolong ZHAO Ning HE Xiaocen DING Yaowen SHI Longxin FAN Hui LAN Muhammad JAMIL | 2020 | Chinese Journal of Aeronautics2020，33，9： | 6 |
| 2 | Energy principle and material removal sequence optimization method in machining of aircraft monolithic parts显示文摘In the machining process of aircraft monolithic parts,the initial residual stress redistribution and structural stiffness evolution often lead to unexpected distortions.On the other hand,the stress redistribution and stiffness reduction during the machining process depend on the material removal sequence.The essence of the stress redistribution is releasing the initial elastic strain energy.In the present study,the influence of the material removal sequence on the energy release is studied.Moreover,a novel optimization method is proposed for the material removal sequence.In order to evaluate the performance of the proposed method,the mechanism of the machining distortion is firstly analyzed based on the energy principle.Then a calculative model for the machining distortion of long beam parts is established accordingly.Moreover,an energy parameter related to the bending distortion and the procedure of the material removal sequence optimization is defined.Finally,the bending distortion analysis and material removal sequence optimization are performed on a long beam with a Z-shaped cross-section.Furthermore,simulation and experiments are carried out.The obtained results indicate that the optimized sequence results in a low distortion fluctuation and decreases the bending distortion. | Yinfei YANG Longxin FAN Liang LI Guolong ZHAO Ning HAN Xiaoyue LI Hui TIAN Ning HE | 2020 | Chinese Journal of Aeronautics2020，33，10： | 2 |
| 3 | Effects of Different Potassium (K) Fertilizer Rates on Yield Formation and Lodging of Rice显示文摘As one of the most important nutrients for plants,potassium(K)has substantial effects on growth and development of crops.Present study was conducted in three different sites in South China in late season in 2019 with the objective to study the effects of different applied amounts of K fertilizer on yield formation and lodging of rice.Four K fertilizer treatments,K_(0):0 kg potassium oxide(K_(2)O)ha^(−1)(control);K_(1):64.20 kg K_(2)O ha^(−1);K_(2):128.55 kg K_(2)O ha^(−1) and K_(3)153.90 kg K_(2)O ha^(−1) were applied in the field experiment.The results showed that K_(2) and K_(3) treatments significantly increased panicle number per unit area,grain number per panicle,seed-setting rate and the grain yield of rice compared with K_(0) treatment.Higher net photosynthetic rates were recorded in K_(2) and K_(3) treatments than K_(0) treatment at tillering stage,heading stage and maturity stage.K fertilizer treatments also increased the chlorophyll content and dry matter accumulation by 6.16–23.52%and 21.32–64.59%compared with K_(0) treatment,respectively.Moreover,the total N and K accumulation in the aboveground tissues of rice significantly increased under K_(2) and K_(3) treatments compared with K_(0) treatment.Furthermore,compared with K_(0) treatment,K fertilizer treatments significantly enhanced the breaking-resistant strength by 40.94–144.24%and reduced the lodging index of rice by 13.14–36.72%. | Tantan Zhang Xiaoping He Binglin Chen Longxin He Xiangru Tang | 2021 | Phyton-International Journal of Experimental Botany2021，90，3： | 1 |
| 4 | Improving anammox activity and reactor start-up speed by using CO_(2)/NaHCO_(3) buffer显示文摘Anammox bacteria grow slowly and can be affected by large pH fluctuations.Using suitable buffers could make the start-up of anammox reactors easy and rapid.In this study,the effects of three kinds of buffers on the nitrogen removal and growth characteristics of anammox sludge were investigated.Reactors with CO_(2)/NaHCO_(3)buffer solution(CCBS)performed the best in nitrogen removal,while 4-(2-hydroxyerhyl)piperazine-1-ethanesulfonic acid(HEPES)and phosphate buffer solution(PBS)inhibited the anammox activity.Reactors with 50 mmol/L CCBS could start up in 20 days,showing the specific anammox activity and anammox activity of 1.01±0.10 gN/(gVSS·day)and 0.83±0.06 kgN/(m^(3)·day),respectively.Candidatus Kuenenia was the dominant anammox bacteria,with a relative abundance of 71.8%.Notably,anammox reactors could also start quickly by using 50 mmol/L CCBS under nonstrict anaerobic conditions.These findings are meaningful for the quick start-up of engineered anammox reactors and prompt enrichment of anammox bacteria. | Shaoan Cheng Huahua Li Xinyuan He Hua Chen Longxin Li | 2024 | Journal of Environmental Sciences2024，，5： | 0 |
| 5 | Epoxiconazole Improved Photosynthesis,Yield Formation,Grain Quality and 2-Acetyl-1-Pyrroline Biosynthesis of Fragrant Rice显示文摘Epoxiconazole is a triazole compound.However,the effects of epoxiconazole on crop productivity and quality were rarely reported.In this study,we investigated the effects of epoxiconazole application on yield formation,grain quality attributes,and 2-acetyl-1-pyrroline(2-AP)content in fragrant rice.A three-year field experiment was carried out with a fragrant rice variety,Meixiangzhan 2.At the heading stage,0,0.02,0.04,0.08,0.16 and 0.32 g/L epoxiconazole solutions were foliar applied to fragrant rice plants,respectively.The results showed that epoxiconazole application significantly increased grain yield,seed-setting rate and 1000-grain weight.Chlorophyll content and net photosynthetic rate of fragrant rice during the grain-filling stage significantly increased due to epoxiconazole application.Foliar application of epoxiconazole at 0.08 g/L increased grain protein content and decreased both chalky rice rate and chalkiness area ratio of fragrant rice.Epoxiconazole also substantially increased grain 2-AP content by inducing the regulation in contents of related synthetic precursors,including proline,pyrroline-5-carboxylic acid,Δ1-pyrroline and methylglyoxal.Overall,foliar application of epoxiconazole could be used for the improvement in grain yield,grain quality and 2-AP content in fragrant rice production when applied concentration at 0.08-0.32 g/L.Our findings provided the new roles of epoxiconazole in crop production. | LUO Haowen HE Longxin DU Bin PAN Shenggang MO Zhaowen YANG Shuying ZOU Yingbin TANG Xiangru | 2022 | Rice science2022，29，2： | 0 |
| 6 | PCR-RFLP Polymorphism of ANGPTL4 Gene in Guizhou Yellow Cattle显示文摘[Objective] The paper was to study the genetic effects of ANGPTL4 gene in Guizhou yellow cattle. [Method] The polymorphisms of ANGPTL4 gene in 46 individuals of Guanling yellow cattle and Sinan yellow cattle were detected using PCR-RFLP assay. [Result] A fragment of 260 bp was amplified from ANGPTL4 gene. After digestion by restriction endonuclease Mlu CI,two genotypes,AA and AB,were produced whereas BB genotype was not found. A mutation of 205T→C was observed through sequencing of different genotypes. AA genotype was dominant in both yellow cattle breeds,and A allele frequency was higher than B allele frequency. χ~2 test results showed that the two cattle breeds were at Hardy-Weinberg equilibrium state in the digestion site( P > 0. 05). [Conclusion]The effective molecular markers of Guizhou yellow cattle,such as growth trait and intramuscular fat content,are obtained,which will provide a theoretical basis for molecular breeding of meat performance of Guizhou yellow cattle. | Xu Longxin Zhang Lin He Guangzhong | 2016 | Animal Husbandry and Feed Science2016，8，4： | 0 |
| 7 | Polymorphism of POMC Gene in Guizhou Yellow Cattle显示文摘[Objective]The paper was to explore the effect of pro-opiomelanocortin (POMC) on feeding behavior and energy homeostasis of animals.[Method]Using DNA sequencing technology,polymorphisms of POMC gene in 92 individuals of Guizhou yellow cattle were studied.[Result]Five mutation sites,138 C> T,430 C> T,644 C> T,668 C> T,693 A> G,were found in the 870 bp amplification product.Polymorphism results showed that except the mutation site 430 C>T that was deviated from the Hardy-Weinberg equilibrium (HWE) state (P<0.05),the rest mutation sites were at the HWE state (P>0.05); the peptide information content (PIC) of five mutation sites were moderate polymorphism.[Conclusion]The POMC gene of Guizhou Yellow Cattle was abundant in genetic diversity,with great selection potential,which could be used as a potential genetic marker of cattle growth traits. | Xu Longxin Liu Jing Zhang Lin He Guangzhong | 2016 | Animal Husbandry and Feed Science2016，8，5： | 0 |
| 8 | Foliar Application of Brassinolide Induced Regulation of Grain Yield and Quality,Antioxidant Responses and Aroma in Fragrant Rice显示文摘Brassinolide(BR)is a new green plant growth regulator.The present field study was conducted on two fragrant rice cultivars(i.e.,Meixiangzhan-2 and Xiangyaxiangzhan)to study the effects of foliar application of BR on fragrant rice performance.At the heading stage,BR solutions at 0.05,0.15,0.25 and 0.50 mg L-1 were sprayed on fragrant rice at 600 liters per hectare;these treatments were named as BR1,BR2,BR3 and BR4,respectively.The treatment sprayed with distilled water was taken as a control(CK).Compared with CK,the BR2 treatment significantly enhanced the chlorophyll concentration and net photosynthetic rate for Meixiangzhan-2,and Xiangyaxiangzhan.The BR3 and BR4 treatments increased the concentrations of chlorophyll a,chlorophyll b and carotenoid,and also enhanced net photosynthetic rate by 31.91%and 40.43%,respectively.Higher grain yields were recorded in the BR2 treatment than on CK on Meixiangzhan-2,while on Xiangyaxiangzhan,the BR3 and BR4 treatments increased grain yield compared with CK.In relation to CK,higher head rice rates were recorded in the BR2 treatment for Meixiangzhan-2,and in the BR3 and BR4 treatments for Xiangyaxiangzhan.BR treatments(BR2 for Meixiangzhan-2,BR3 and BR4 for Xiangyaxiangzhan)also significantly enhanced the activities of GPX,SOD and CAT by 10.22%to 23.00%,and reduced the malonaldehyde concentration.In addition,we observed that some BR treatments(BR2 for Meixiangzhan-2,BR3 and BR4 for Xiangyaxiangzhan)decreased the grain 2-acetyl-1-pyrroline concentration of fragrant rice. | Jinhai Liu Rifang Lai Longxin He Pipeng Xing Haowen Luo Shuying Yang Yingbin Zou Xiangru Tang | 2022 | Phyton-International Journal of Experimental Botany2022，91，5： | 0 |
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