BACKGROUND Hypertension(HTN)is a prevalent chronic health condition that significantly increases the risk of cardiovascular diseases-associated mortalities.Despite the use of antihypertensive medications,numerous pati...BACKGROUND Hypertension(HTN)is a prevalent chronic health condition that significantly increases the risk of cardiovascular diseases-associated mortalities.Despite the use of antihypertensive medications,numerous patients fail to achieve guidelinerecommended blood pressure(BP)targets.AIM To evaluates the efficacy of catheter-based ultrasound renal denervation(uRDN)for the treatment of HTN.METHODS Relevant studies were identified through searches in PubMed,Embase,the Cochrane Library,Web of Science,and China National Knowledge Infrastructure,with a cut-off date at April 1,2024.A random-effects model was employed in this study to mitigate potential biases.The risk of bias for included studies was assessed using the Cochrane Risk of Bias assessment tool.Statistical analyses were conducted using Review Manager version 5.3.This meta-analysis incorporated four studies encompassing a total of 627 patients.The reporting bias of this study was deemed acceptable.RESULTS Compared to the Sham group,the uRDN group demonstrated a significant reduction in daytime ambulatory systolic BP(SBP)[mean difference(MD)-3.87 mmHg,95%confidence interval(CI):-7.02 to-0.73,P=0.02],office SBP(MD-4.13 mmHg,95%CI:-7.15 to-1.12,P=0.007),and home SBP(MD-5.51 mmHg,95%CI:-8.47 to-2.55,P<0.001).However,there was no statistically significant reduction observed in either 24-hour or nighttime ambulatory SBP levels.Subgroup analysis shows that uRDN can significantly reduce the SBP in patients with non-resistant HTN(MD-6.19 mmHg,MD-6.00 mmHg,MD-7.72 mmHg,MD-5.02 mmHg,MD-3.61 mmHg).CONCLUSION The current evidence suggests that uRDN may effectively reduce home,office,and daytime SBP in patients with HTN,particularly in those with non-resistant HTN.展开更多
Paconiflorin(Pae)is a monoterpenoid glycoside compound and has many biological activitics,such as immunosuppression,anti-inflammation and anti-cell proliferation.However,the effects and mechanisms of Pae on chronic he...Paconiflorin(Pae)is a monoterpenoid glycoside compound and has many biological activitics,such as immunosuppression,anti-inflammation and anti-cell proliferation.However,the effects and mechanisms of Pae on chronic heart failure(CHF)remain unclear.This study was conducted to assess the effects and mechanisms of Pae on myocardial fibrosis in isoprenaline(Iso)-induced CHF rats.Pae(20 mgkg)was intragastrically administrated to CHF rats for 6 weeks.Cardiac structure and function were assessed.The protein and mRNA levels of transforming growth factorβ1(TGF-β1)and p38 were detected.C ompared to Iso group,Pae could alleviate myocardial fbrosis and improve cardiac function in CHF rats.The levels of collagen volume fraction(13.75%+3.77%vs.30.97%+4.22%,P<0.001)and perivascular collagen volume area(14.32%+2.50%v8.28.31%+3.16%,P<0.001)were significantly reduced in Pae group as compared with those in Iso group.The expression of TGF-BI protein(0.30+0.07 vs.0.66+0.07,P<0.05)and mRNA(3.51+0.44 vs.7.58+0.58,P<0.05)decreased significantly in Pac group as compared with that in Iso group.The expression of p38 protein(0.36+0.12 vs.0.81+0.38,P<0.05)and mRNA(3.84+0.05 vs.4.40+0.17,P<0.05)also decreased markedly in Pae group as compared with that in Iso group.Pae could attenuate myocardial fibrosis and improve cardiac function in CHF rats by down-regulating the p38 MAPK signaling pathway.展开更多
A lagoon in the New Binhai District, a high-speed developing area, Tianjin, China, has long been receiving the mixed chemical industrial wastewater from a chemical industrial park. This lagoon contained complex hazard...A lagoon in the New Binhai District, a high-speed developing area, Tianjin, China, has long been receiving the mixed chemical industrial wastewater from a chemical industrial park. This lagoon contained complex hazardous substances such as heavy metals and accumulative pollutants which stayed over time with a poor biodegradability. According to the characteristics of wastewater in the lagoon, the micro-electrolysis process was applied to improve the biodegradability before the bioprocess treatment. By the orthogonal experimental study of main factors influencing the efficiency of the treatment method, the best control parameters were obtained, including pH=2.0, a volume ratio of Fe and reaction wastewater of 0.03750, a volume ratio of Fe and the granular activated carbon (GAC) of 2.0, a mixing speed of 200 r/min, and a hydraulic retention time (HRT) of 1.5 h. In the meantime, the removal rate of chemical oxygen demand (COD) was up to 64.6%, and NH4+-N and Pb in the influent were partly removed. After the micro-electrolysis process, the ratio of biochemical oxygen demand (BOD) to COD (B/C ratio) was greater than 0.6, thus providing a favorable basis for bioprocess treatment.展开更多
[Objective]The aim was to study on characteristics of retoon rice yield components,and relationship of the characteristics with born bud rate and root ac-tivity of retoon rice before harvesting.[Method]Eighteen mid-se...[Objective]The aim was to study on characteristics of retoon rice yield components,and relationship of the characteristics with born bud rate and root ac-tivity of retoon rice before harvesting.[Method]Eighteen mid-season hybrid rice va-rieties approved recently were taken as materials in high-yield cultivation conditions.Characteristics of retoon rice yield components were analyzed,and relationship of yield components characteristics with the rate of bud emergence and root activity of retoon rice before harvesting was explored,based on related data.[Result]Highly-yielding retoon rice is characterized by high effective ear number(Xl)and high set-ting percentage(X4);the number of germinated shoots the 5^*d after first-batch rice was cut is a key factor for retoon rice yield and was of positive correlation with re-toon rice seedlings and effective ears,with correlation coefficients at 0.80^**and 0.76^**.In addition,bleeding sap was of positive correlation with grain number and setting percentage of retoon rice and correlation coefficients were 0.50^*and 0.48^**,and of positive correlation with average panicle weight,with correlation coefficient at 0.63.[Conclusion]It is an effective way for the rate of bud emergence and root activity at lar ecological zones.mproving retoon rice yield to increase harvesting in the test sites and simi lar ecological zones.展开更多
A lagoon in the New Binhai District,a high-speed developing area,Tianjin,China,has long been receiving the mixed chemical industrial wastewater from a chemical industrial park.This lagoon contained complex hazardous s...A lagoon in the New Binhai District,a high-speed developing area,Tianjin,China,has long been receiving the mixed chemical industrial wastewater from a chemical industrial park.This lagoon contained complex hazardous substances such as heavy metals and accumulative pollutants which stayed over time with a poor biodegradability.According to the characteristics of wastewater in the lagoon,the micro-electrolysis process was applied to improve the biodegradability before the bioprocess treatment.By the orthogonal experimental study of main factors influencing the efficiency of the treatment method,the best control parameters were obtained,including pH=2.0,a volume ratio of Fe and reaction wastewater of 0.03750,a volume ratio of Fe and the granular activated carbon(GAC)of 2.0,a mixing speed of 200 r/min,and a hydraulic retention time(HRT)of 1.5 h.In the meantime,the removal rate of chemical oxygen demand(COD)was up to 64.6%,and NH4+–N and Pb in the influent were partly removed.After the micro-electrolysis process,the ratio of biochemical oxygen demand(BOD)to COD(B/C ratio)was greater than 0.6,thus providing a favorable basis for bioprocess treatment.展开更多
Recently, cognitive impairments(CI) and behavioral abnormalities in patients with amyotrophic lateral sclerosis(ALS) have been reported. However, the underlying mechanisms have been poorly understood. In the current s...Recently, cognitive impairments(CI) and behavioral abnormalities in patients with amyotrophic lateral sclerosis(ALS) have been reported. However, the underlying mechanisms have been poorly understood. In the current study, we explored the role of gut microbiota in CI of ALS patients. We collected fecal samples from 35ALS patients and 35 healthy controls. The cognitive function of the ALS patients was evaluated using the Edinburgh Cognitive and Behavioral ALS Screen. We analyzed these samples by using 16S rRNA gene sequencing as well as both untargeted and targeted(bile acids) metabolite mapping between patients with CI and patients with normal cognition(CN). We found altered gut microbial communities and a lower ratio of Firmicutes/Bacteroidetes in the CI group, compared with the CN group. In addition, the untargeted metabolite mapping revealed that 26 and 17 metabolites significantly increased and decreased, respectively, in the CI group, compared with the CN group. These metabolites were mapped to the metabolic pathways associated with bile acids. We further found that cholic acid and chenodeoxycholic acid were significantly lower in the CI group than in the CN group. In conclusion, we found that the gut microbiota and its metabolome profile differed between ALS patients with and without CI and that the altered bile acid profile in fecal samples was significantly associated with CI in ALS patients. These results need to be replicated in larger studies in the future.展开更多
A rotary-concentrating device for thermal conduction is constructed to control and guide thermal energy transmitting in elastic plates.The designed device has the ability of concentrating for thermal conduction and co...A rotary-concentrating device for thermal conduction is constructed to control and guide thermal energy transmitting in elastic plates.The designed device has the ability of concentrating for thermal conduction and controlling the processes of thermal diffusion in a plate.The multilayered isotropic material properties of the rotary-concentrating device are derived based on the transformation and rotary medium method and a rotation parameter to control the thermal diffusion process is introduced.The efficiency of the rotary-concentrating device for thermal conduction is verified.Stability of temperature fields in a plate with the rotary-concentrating device is analyzed to study the performance of rotary-concentrating.Numerical examples show that the constructed rotary-concentrating device for thermal conduction can effectively rotate and focus on the thermal energy into the device for a wide range of diffusion temperatures,which can enhance the thermal conduction.Therefore,this study can provide a theoretical support for potential applications in fields of energy harvesting and thermal conduction control.展开更多
AIM: To compare the short-term clinical outcomes of robot-assisted gastrectomy(RAG) with laparoscopyassisted gastrectomy(LAG) in gastric cancer patients.METHODS: Articles were identified through a literature search of...AIM: To compare the short-term clinical outcomes of robot-assisted gastrectomy(RAG) with laparoscopyassisted gastrectomy(LAG) in gastric cancer patients.METHODS: Articles were identified through a literature search of Pubmed, EMBASE, Scopus, Web of Science, Chinese National Knowledge Infrastructure and the Cochrane Library. Weighted mean differences(WMDs) and odds ratios(ORs) were selected as effect sizes for quantitative variables and qualitative variables, respectively. And 95%CIs were also calculated.RESULTS: A total of 13 studies with 3518 patients were included. RAG was associated with longer operative time(WMD = 46.26 min, 95%CI: 31.89-60.63, P < 0.00001), less blood loss [WMD =-37.19 m L, 95%CI:-60.16-(-14.23), P = 0.002] and shorter postoperative hospital stay [WMD =-0.65 d, 95%CI:-1.24-(-0.05), P = 0.03] than LAG. No significant difference in the numbers of retrieved lymph nodes was found between the two groups(WMD = 1.46, 95%CI:-0.19-3.10, P = 0.08). There was no significant difference in mortality(OR = 1.55, 95%CI: 0.49-4.94, P = 0.45), overall complications(OR = 1.00, 95%CI: 0.80-1.26, P = 0.98), anastomosis leakage(OR = 1.02, 95%CI: 0.62-1.65, P = 0.95) and anastomosis stenosis rates(OR = 0.54, 95%CI: 0.18-1.57, P = 0.25). CONCLUSION: RAG is effective and safe in the treatment of gastric cancer. RAG is a promising alternative to laparoscopic surgery. Long-term randomized controlled studies with large scale and improved designs are needed to further evaluate the long-term outcomes.展开更多
Rice yields and nitrogen use efficiencies were studied at five sites in southwest China using two nitrogen fertilization rates and five controlled-release urea（ CRU） to ordinary urea（ U） ratios. The fertilizer tre...Rice yields and nitrogen use efficiencies were studied at five sites in southwest China using two nitrogen fertilization rates and five controlled-release urea（ CRU） to ordinary urea（ U） ratios. The fertilizer treatments significantly increased rice yields compared with the control（ no nitrogen added） yields to different degrees at different sites. Applying CRU and U increased the rice yield more than adding the same amount of nitrogen as U only. Higher increasing production rate were found using a nitrogen application rate of 105 kg/hm2 than 150 kg/hm2. A 70∶ 30 CRU∶ U ratio increased the yield more than other four ratios. Nitrogen use efficiency was 21. 9% higher using a nitrogen application rate of 105 kg/hm^2 than 150 kg/hm^2,and 46. 6%,38. 1%,34. 7%,and 22. 2% higher than when only U was applied when CRU∶ U ratios of 70 ∶ 30,50 ∶ 50,100 ∶ 0,and 30 ∶ 70,respectively,were used. A 70 ∶ 30 CRU ∶ U ratio gave the highest economic output（ yuan/hm^2）. Applying both CRU and U gave an output 3 078. 87 yuan/hm^2 higher at a nitrogen application rate of 150 kg/hm^2 than at a nitrogen application rate of 105 kg/hm^2. Economic output was always higher using both CRU and U than using U only. The highest economic output was given using a 70∶ 30 CRU∶ U ratio.Increasing the amount of nitrogen added decreased the output efficiency（ per hm2） because CRU is expensive. Significant relationships were found between the yield increase rate and the proportion of CRU added（ regression equation y = 7. 429 x-185. 7,R^2= 0. 663） and between the total rainfall over the whole growth period and the proportion of CRU added（ y =-0. 087 1 x ＋ 112. 29,R^2= 0. 687 9）. These regression equations can be used to determine the appropriate proportion of CRU that should be added at a site,depending on the rainfall and target rice yield.展开更多
[Objectives]This study was conducted to enrich grape varieties.[Methods]The growth and fruit quality of grape with different rootstock and scion combinations were compared and analyzed taking CR2,CR3 and CR9 as rootst...[Objectives]This study was conducted to enrich grape varieties.[Methods]The growth and fruit quality of grape with different rootstock and scion combinations were compared and analyzed taking CR2,CR3 and CR9 as rootstocks and‘Huangjinmi’as grafted seedlings and own-rooted seedlings as control.[Results]The comprehensive scores of‘Huangjinmi’grape with different rootstock and scion combinations showed an order of HJM/CR9,HJM/CR2 and HJM/CR3 from high to low.The three rootstock and scion combinations obviously promoted the growth and adaptability of grape trees,increased fruit size and improved fruit quality.Through the quality analysis of untreated and treated fruits,HJM/CR9 was superior to ZGM.Different fruit management measures can be adopted for‘Huangjinmi’grape to produce fruit with different quality according to market demand.[Conclusions]This study has a guiding significance for screening grape varieties suitable for adverse environments such as high soil viscosity,high temperature and high humidity.展开更多
The application of nanomaterials in energy and environmental fields has recently made great progress.As a key element in the nuclear industry,the discharge of uranium(U(VI))contained wastewater usually induces environ...The application of nanomaterials in energy and environmental fields has recently made great progress.As a key element in the nuclear industry,the discharge of uranium(U(VI))contained wastewater usually induces environmental issues and waste of resources.Although the catalytically generated H_(2)O_(2)by nanomaterials has recently shown application potential in extracting U(VI)from water,low-cost and highly efficient nanocatalysts are still urgently needed.In this work,a cheap and readily available piezocatalyst of calcium phosphate nanorods was successfully fabricated by calcining chicken bones.Under ultrasonication,H_(2)O_(2)was produced and used to extract U(VI)from water.It is worth noting that the yield of H_(2)O_(2)reached 179.7μmol·g^(−1)·h^(−1),and the extraction efficiency of U(VI)in water reached 97.16%(100 ppm)within 330 min.Through the capture and quantitative analysis of the active species,it is found that the generation of H_(2)O_(2)depends on the combination of soluble oxygen and piezoelectrons,which thus dominates the extraction of U(VI).This simple and powerful piezocatalytic strategy greatly reduces the cost of H_(2)O_(2)production for U(VI)extraction in water,and is of great significance for the treatment of U(VI)-containing wastewater.展开更多
基金Supported by Sichuan Provincial Medical Research Youth Innovation Project,No.Q22063Guang'an District People's Hospital Joint Development Research Project,No.2024 LHFZ04。
文摘BACKGROUND Hypertension(HTN)is a prevalent chronic health condition that significantly increases the risk of cardiovascular diseases-associated mortalities.Despite the use of antihypertensive medications,numerous patients fail to achieve guidelinerecommended blood pressure(BP)targets.AIM To evaluates the efficacy of catheter-based ultrasound renal denervation(uRDN)for the treatment of HTN.METHODS Relevant studies were identified through searches in PubMed,Embase,the Cochrane Library,Web of Science,and China National Knowledge Infrastructure,with a cut-off date at April 1,2024.A random-effects model was employed in this study to mitigate potential biases.The risk of bias for included studies was assessed using the Cochrane Risk of Bias assessment tool.Statistical analyses were conducted using Review Manager version 5.3.This meta-analysis incorporated four studies encompassing a total of 627 patients.The reporting bias of this study was deemed acceptable.RESULTS Compared to the Sham group,the uRDN group demonstrated a significant reduction in daytime ambulatory systolic BP(SBP)[mean difference(MD)-3.87 mmHg,95%confidence interval(CI):-7.02 to-0.73,P=0.02],office SBP(MD-4.13 mmHg,95%CI:-7.15 to-1.12,P=0.007),and home SBP(MD-5.51 mmHg,95%CI:-8.47 to-2.55,P<0.001).However,there was no statistically significant reduction observed in either 24-hour or nighttime ambulatory SBP levels.Subgroup analysis shows that uRDN can significantly reduce the SBP in patients with non-resistant HTN(MD-6.19 mmHg,MD-6.00 mmHg,MD-7.72 mmHg,MD-5.02 mmHg,MD-3.61 mmHg).CONCLUSION The current evidence suggests that uRDN may effectively reduce home,office,and daytime SBP in patients with HTN,particularly in those with non-resistant HTN.
基金This study was supported by grants from Scientific Research Development Program of North Sichuan Medical College(No.CBY16-A-ZD10)Nanchong Government-University Strategic Cooperation Project in Science and Technology(No.18SXHZ0505).
文摘Paconiflorin(Pae)is a monoterpenoid glycoside compound and has many biological activitics,such as immunosuppression,anti-inflammation and anti-cell proliferation.However,the effects and mechanisms of Pae on chronic heart failure(CHF)remain unclear.This study was conducted to assess the effects and mechanisms of Pae on myocardial fibrosis in isoprenaline(Iso)-induced CHF rats.Pae(20 mgkg)was intragastrically administrated to CHF rats for 6 weeks.Cardiac structure and function were assessed.The protein and mRNA levels of transforming growth factorβ1(TGF-β1)and p38 were detected.C ompared to Iso group,Pae could alleviate myocardial fbrosis and improve cardiac function in CHF rats.The levels of collagen volume fraction(13.75%+3.77%vs.30.97%+4.22%,P<0.001)and perivascular collagen volume area(14.32%+2.50%v8.28.31%+3.16%,P<0.001)were significantly reduced in Pae group as compared with those in Iso group.The expression of TGF-BI protein(0.30+0.07 vs.0.66+0.07,P<0.05)and mRNA(3.51+0.44 vs.7.58+0.58,P<0.05)decreased significantly in Pac group as compared with that in Iso group.The expression of p38 protein(0.36+0.12 vs.0.81+0.38,P<0.05)and mRNA(3.84+0.05 vs.4.40+0.17,P<0.05)also decreased markedly in Pae group as compared with that in Iso group.Pae could attenuate myocardial fibrosis and improve cardiac function in CHF rats by down-regulating the p38 MAPK signaling pathway.
基金Project supported by the National Natural Science Foundation of China (No. 70833003)the National Science and Technology Support Project of 11th 5-Year Plan, China (No. 200603746006)
文摘A lagoon in the New Binhai District, a high-speed developing area, Tianjin, China, has long been receiving the mixed chemical industrial wastewater from a chemical industrial park. This lagoon contained complex hazardous substances such as heavy metals and accumulative pollutants which stayed over time with a poor biodegradability. According to the characteristics of wastewater in the lagoon, the micro-electrolysis process was applied to improve the biodegradability before the bioprocess treatment. By the orthogonal experimental study of main factors influencing the efficiency of the treatment method, the best control parameters were obtained, including pH=2.0, a volume ratio of Fe and reaction wastewater of 0.03750, a volume ratio of Fe and the granular activated carbon (GAC) of 2.0, a mixing speed of 200 r/min, and a hydraulic retention time (HRT) of 1.5 h. In the meantime, the removal rate of chemical oxygen demand (COD) was up to 64.6%, and NH4+-N and Pb in the influent were partly removed. After the micro-electrolysis process, the ratio of biochemical oxygen demand (BOD) to COD (B/C ratio) was greater than 0.6, thus providing a favorable basis for bioprocess treatment.
文摘[Objective]The aim was to study on characteristics of retoon rice yield components,and relationship of the characteristics with born bud rate and root ac-tivity of retoon rice before harvesting.[Method]Eighteen mid-season hybrid rice va-rieties approved recently were taken as materials in high-yield cultivation conditions.Characteristics of retoon rice yield components were analyzed,and relationship of yield components characteristics with the rate of bud emergence and root activity of retoon rice before harvesting was explored,based on related data.[Result]Highly-yielding retoon rice is characterized by high effective ear number(Xl)and high set-ting percentage(X4);the number of germinated shoots the 5^*d after first-batch rice was cut is a key factor for retoon rice yield and was of positive correlation with re-toon rice seedlings and effective ears,with correlation coefficients at 0.80^**and 0.76^**.In addition,bleeding sap was of positive correlation with grain number and setting percentage of retoon rice and correlation coefficients were 0.50^*and 0.48^**,and of positive correlation with average panicle weight,with correlation coefficient at 0.63.[Conclusion]It is an effective way for the rate of bud emergence and root activity at lar ecological zones.mproving retoon rice yield to increase harvesting in the test sites and simi lar ecological zones.
文摘A lagoon in the New Binhai District,a high-speed developing area,Tianjin,China,has long been receiving the mixed chemical industrial wastewater from a chemical industrial park.This lagoon contained complex hazardous substances such as heavy metals and accumulative pollutants which stayed over time with a poor biodegradability.According to the characteristics of wastewater in the lagoon,the micro-electrolysis process was applied to improve the biodegradability before the bioprocess treatment.By the orthogonal experimental study of main factors influencing the efficiency of the treatment method,the best control parameters were obtained,including pH=2.0,a volume ratio of Fe and reaction wastewater of 0.03750,a volume ratio of Fe and the granular activated carbon(GAC)of 2.0,a mixing speed of 200 r/min,and a hydraulic retention time(HRT)of 1.5 h.In the meantime,the removal rate of chemical oxygen demand(COD)was up to 64.6%,and NH4+–N and Pb in the influent were partly removed.After the micro-electrolysis process,the ratio of biochemical oxygen demand(BOD)to COD(B/C ratio)was greater than 0.6,thus providing a favorable basis for bioprocess treatment.
基金supported by the National Key Research and Development Program of China(Grants No.2018YFE0118900 and 2021YFC2502200)the clinical research project of the Bethune Charitable Foundation。
文摘Recently, cognitive impairments(CI) and behavioral abnormalities in patients with amyotrophic lateral sclerosis(ALS) have been reported. However, the underlying mechanisms have been poorly understood. In the current study, we explored the role of gut microbiota in CI of ALS patients. We collected fecal samples from 35ALS patients and 35 healthy controls. The cognitive function of the ALS patients was evaluated using the Edinburgh Cognitive and Behavioral ALS Screen. We analyzed these samples by using 16S rRNA gene sequencing as well as both untargeted and targeted(bile acids) metabolite mapping between patients with CI and patients with normal cognition(CN). We found altered gut microbial communities and a lower ratio of Firmicutes/Bacteroidetes in the CI group, compared with the CN group. In addition, the untargeted metabolite mapping revealed that 26 and 17 metabolites significantly increased and decreased, respectively, in the CI group, compared with the CN group. These metabolites were mapped to the metabolic pathways associated with bile acids. We further found that cholic acid and chenodeoxycholic acid were significantly lower in the CI group than in the CN group. In conclusion, we found that the gut microbiota and its metabolome profile differed between ALS patients with and without CI and that the altered bile acid profile in fecal samples was significantly associated with CI in ALS patients. These results need to be replicated in larger studies in the future.
基金Project supported by the National Natural Science Foundation of China(Grant No.12102150)the Natural Science Foundation of Jiangsu Province+3 种基金China(Grant Nos.BK20200884 and BK20201414)the Natural Science Foundation of Colleges and Universities in Jiangsu Province,China(Grant No.20KJB130004)China Postdoctoral Science Foundation(Grant No.2021M702444)the Jiangsu’s Mass Entrepreneurship and Innovation Program of Jiangsu Province。
文摘A rotary-concentrating device for thermal conduction is constructed to control and guide thermal energy transmitting in elastic plates.The designed device has the ability of concentrating for thermal conduction and controlling the processes of thermal diffusion in a plate.The multilayered isotropic material properties of the rotary-concentrating device are derived based on the transformation and rotary medium method and a rotation parameter to control the thermal diffusion process is introduced.The efficiency of the rotary-concentrating device for thermal conduction is verified.Stability of temperature fields in a plate with the rotary-concentrating device is analyzed to study the performance of rotary-concentrating.Numerical examples show that the constructed rotary-concentrating device for thermal conduction can effectively rotate and focus on the thermal energy into the device for a wide range of diffusion temperatures,which can enhance the thermal conduction.Therefore,this study can provide a theoretical support for potential applications in fields of energy harvesting and thermal conduction control.
文摘AIM: To compare the short-term clinical outcomes of robot-assisted gastrectomy(RAG) with laparoscopyassisted gastrectomy(LAG) in gastric cancer patients.METHODS: Articles were identified through a literature search of Pubmed, EMBASE, Scopus, Web of Science, Chinese National Knowledge Infrastructure and the Cochrane Library. Weighted mean differences(WMDs) and odds ratios(ORs) were selected as effect sizes for quantitative variables and qualitative variables, respectively. And 95%CIs were also calculated.RESULTS: A total of 13 studies with 3518 patients were included. RAG was associated with longer operative time(WMD = 46.26 min, 95%CI: 31.89-60.63, P < 0.00001), less blood loss [WMD =-37.19 m L, 95%CI:-60.16-(-14.23), P = 0.002] and shorter postoperative hospital stay [WMD =-0.65 d, 95%CI:-1.24-(-0.05), P = 0.03] than LAG. No significant difference in the numbers of retrieved lymph nodes was found between the two groups(WMD = 1.46, 95%CI:-0.19-3.10, P = 0.08). There was no significant difference in mortality(OR = 1.55, 95%CI: 0.49-4.94, P = 0.45), overall complications(OR = 1.00, 95%CI: 0.80-1.26, P = 0.98), anastomosis leakage(OR = 1.02, 95%CI: 0.62-1.65, P = 0.95) and anastomosis stenosis rates(OR = 0.54, 95%CI: 0.18-1.57, P = 0.25). CONCLUSION: RAG is effective and safe in the treatment of gastric cancer. RAG is a promising alternative to laparoscopic surgery. Long-term randomized controlled studies with large scale and improved designs are needed to further evaluate the long-term outcomes.
基金Supported by Study and Mode Construction of Water and Fertilizer Coupling and Accurate Fertilizer and Drug Reduction High-yielding Synergistic Technology during Diversified Rice Planting in the West Part of the Middle and Lower Reaches of the Yangtze River(2017YFD0301700)National System of Rice Industrial Technology(CARS-01-25)
文摘Rice yields and nitrogen use efficiencies were studied at five sites in southwest China using two nitrogen fertilization rates and five controlled-release urea（ CRU） to ordinary urea（ U） ratios. The fertilizer treatments significantly increased rice yields compared with the control（ no nitrogen added） yields to different degrees at different sites. Applying CRU and U increased the rice yield more than adding the same amount of nitrogen as U only. Higher increasing production rate were found using a nitrogen application rate of 105 kg/hm2 than 150 kg/hm2. A 70∶ 30 CRU∶ U ratio increased the yield more than other four ratios. Nitrogen use efficiency was 21. 9% higher using a nitrogen application rate of 105 kg/hm^2 than 150 kg/hm^2,and 46. 6%,38. 1%,34. 7%,and 22. 2% higher than when only U was applied when CRU∶ U ratios of 70 ∶ 30,50 ∶ 50,100 ∶ 0,and 30 ∶ 70,respectively,were used. A 70 ∶ 30 CRU ∶ U ratio gave the highest economic output（ yuan/hm^2）. Applying both CRU and U gave an output 3 078. 87 yuan/hm^2 higher at a nitrogen application rate of 150 kg/hm^2 than at a nitrogen application rate of 105 kg/hm^2. Economic output was always higher using both CRU and U than using U only. The highest economic output was given using a 70∶ 30 CRU∶ U ratio.Increasing the amount of nitrogen added decreased the output efficiency（ per hm2） because CRU is expensive. Significant relationships were found between the yield increase rate and the proportion of CRU added（ regression equation y = 7. 429 x-185. 7,R^2= 0. 663） and between the total rainfall over the whole growth period and the proportion of CRU added（ y =-0. 087 1 x ＋ 112. 29,R^2= 0. 687 9）. These regression equations can be used to determine the appropriate proportion of CRU that should be added at a site,depending on the rainfall and target rice yield.
基金Supported by National Modern Agriculture Industry Technology System Construction Project(CARS-29-14)Chuzhou Science and Technology Planning Project(2022ZN004)+1 种基金Anhui Provincial Science and Technology Mission Project(2023tpt027)Special Project of Chief Expert Studio of Agricultural Industry in Hefei City,Anhui Province(2023).
文摘[Objectives]This study was conducted to enrich grape varieties.[Methods]The growth and fruit quality of grape with different rootstock and scion combinations were compared and analyzed taking CR2,CR3 and CR9 as rootstocks and‘Huangjinmi’as grafted seedlings and own-rooted seedlings as control.[Results]The comprehensive scores of‘Huangjinmi’grape with different rootstock and scion combinations showed an order of HJM/CR9,HJM/CR2 and HJM/CR3 from high to low.The three rootstock and scion combinations obviously promoted the growth and adaptability of grape trees,increased fruit size and improved fruit quality.Through the quality analysis of untreated and treated fruits,HJM/CR9 was superior to ZGM.Different fruit management measures can be adopted for‘Huangjinmi’grape to produce fruit with different quality according to market demand.[Conclusions]This study has a guiding significance for screening grape varieties suitable for adverse environments such as high soil viscosity,high temperature and high humidity.
基金funded by the National Natural Science Foundation of China(Nos.22376060,U2267222,and U21A20290)Qinghai Provincial Science and Technology Project(No.2021-ZJ-925).
文摘The application of nanomaterials in energy and environmental fields has recently made great progress.As a key element in the nuclear industry,the discharge of uranium(U(VI))contained wastewater usually induces environmental issues and waste of resources.Although the catalytically generated H_(2)O_(2)by nanomaterials has recently shown application potential in extracting U(VI)from water,low-cost and highly efficient nanocatalysts are still urgently needed.In this work,a cheap and readily available piezocatalyst of calcium phosphate nanorods was successfully fabricated by calcining chicken bones.Under ultrasonication,H_(2)O_(2)was produced and used to extract U(VI)from water.It is worth noting that the yield of H_(2)O_(2)reached 179.7μmol·g^(−1)·h^(−1),and the extraction efficiency of U(VI)in water reached 97.16%(100 ppm)within 330 min.Through the capture and quantitative analysis of the active species,it is found that the generation of H_(2)O_(2)depends on the combination of soluble oxygen and piezoelectrons,which thus dominates the extraction of U(VI).This simple and powerful piezocatalytic strategy greatly reduces the cost of H_(2)O_(2)production for U(VI)extraction in water,and is of great significance for the treatment of U(VI)-containing wastewater.
