检索结果-南通市图书馆

长期施用有机肥对西北半干旱区小麦田土壤团聚体分布及其有机碳的影响

在线全文

学校读者我要写书评

暂无评论

中国土壤与肥料 2024年第4期 1-8页

作者：张平良刘晓伟曾骏郭天文甘肃省农业科学院旱地农业研究所甘肃兰州730070 甘肃省旱作区水资源高效利用重点实验室/农业农村部西北旱地农业绿色低碳重点实验室/部省共建农业农村部旱地作物抗逆增产及雨水高效利用重点实验室甘肃兰州730070 甘肃省农业科学院甘肃兰州730070

以国家土壤质量安定观测实验站黄绵土区长期定位试验为研究平台,研究长期施肥对半干旱区小麦田土壤团聚体分布及其有机碳含量的影响。结果表明:0~20 cm土层土壤团聚体含量随粒级减小总体呈先降低后增加的变化趋势,团聚体有机碳含量随粒... 详细信息

以国家土壤质量安定观测实验站黄绵土区长期定位试验为研究平台,研究长期施肥对半干旱区小麦田土壤团聚体分布及其有机碳含量的影响。结果表明:0~20 cm土层土壤团聚体含量随粒级减小总体呈先降低后增加的变化趋势,团聚体有机碳含量随粒级减小呈增加的变化趋势。长期化肥与有机肥配施(NPKM)和单施有机肥(OM)较单施化肥(NPK)处理显著增加了>0.25 mm团聚体含量和团聚体平均质量直径,提高了>1 mm粒级土壤团聚体对有机碳的贡献率。各粒级土壤团聚体有机碳含量及团聚体有机碳储量均随着土层的加深而降低,>1 mm粒级团聚体有机碳对长期施用有机肥的农田有机碳变化响应敏感。NPKM和OM较NPK处理显著增加了0~20 cm土层土壤团聚体有机碳含量及其储量,其中0~10 cm土层团聚体有机碳储量分别增加了34.1%和25.2%,10~20 cm土层分别增加了26.89%和17.95%,而长期NPK处理对团聚体有机碳含量及其储量影响不明显。综上所述,在西北黄土丘陵半干旱区黄绵土条件下,长期施用有机肥(NPKM和OM处理)可显著提高耕层>0.25 mm团聚体含量及其稳定性,增加团聚体有机碳储量,土壤增碳培肥效果显著,而单施化肥对改善农田土壤团聚体结构及其固碳培肥效果不明显,需加强与有机肥配施从而实现土壤培肥。

关键词：施肥土壤团聚体有机碳有机碳储量

Sunflower response to potassium fertilization and nutrient requirement estimation

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2018年第12期17卷 2802-2812页

作者： LI Shu-tian DUAN Yu guo tian-wen ZHANG Ping-liang HE Ping Kaushik Majumdar Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural SciencesBeijing 100081P.R.China International Plant Nutrition Institute Beijing Office Beijing 100081P.R.China Institute of Resources Environment and Detection Technology Inner Mongolia Academy of Agricultural and Animal Husbandry SciencesHohhot 010031P.R.China Dryland Agriculture Institute Gansu Academy of Agricultural SciencesLanzhou 730070P.R.China International Plant Nutrition Institute (IPNI) Gurgaon 122001India

Field experiments were conducted in oil and edible sunflower to study the effects of potassium(K) fertilization on achene yield and quality, and to estimate the nutrient internal efficiency(IE) and nutrient requirement in sunflower production. All trials in edible sunflower and 75% trials in oil sunflower showed positive yield responses to K fertilization. Compared with control without K fertilization, the application of K increased achene yield by an average of 406 kg ha–1for oil sunflower and 294 kg ha–1for edible sunflower. K application also increased 1 000-achene weight and kernel rate of both oil and edible sunflower. K fertilization improved the contents of oil, oleic acid, linoleic acid and linolenic acid in achenes of oil sunflower, and increased contents of oil, total unsaturated fatty acid and protein in achenes of edible sunflower. The average agronomic efficiency of K fertilizer was 4.0 for oil sunflower and 3.0 kg achene kg–1K2O for edible sunflower. The average IE of N, P and K under balanced NPK fertilization was 22.9, 82.8, and 9.9 kg kg–1for oil sunflower, and 27.3, 138.9, and 14.3 kg kg–1for edible sunflower. These values were equivalent to 45.5, 14.1, and 108.1 kg, and 39.0, 8.0, and 71.7 kg of N, P and K, respectively, in above-ground dry matter required for production per ton of achenes. The average harvest index of N, P and K was 0.47, 0.56 and 0.05 kg kg–1in oil sunflower, and 0.58, 0.58 and 0.14 kg kg–1in edible sunflower.

关键词： sunflower potassium yield response K use efficiency

Closed reduction external fixator fixation versus open reduction internal fixation in the patients with Bennett fracture dislocation

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2014年第22期127卷 3902-3905页

作者： Li Zhongzhe guo Yang tian wen tian Guanglei Department of Hand Surgery Beijing Jishuitan Hospital Beijing 100035 China

Background The Bennett fracture is either a common or a challenging problem to hand *** is still debated whether closed or open reduction gives optimal *** study aimed to describe and assess a closed reduction and mini-external fixator fixation technique for the treatment of Bennett＇s fracture dislocation and to compare this technique versus open reduction and internal *** From October 2002 to December 2012,56 patients with Bennett＇s fracture dislocation were treated by closed reduction and mini-external fixator fixation and 32 patients were treated by open reduction and internal fixation in Jishuitan *** with an articular step-off of more than 1 mm were *** patients were assessed at a mean followup of 7 years （range 2-10 years） and the two groups were compared with pain levels,active range of trapeziometacarpal motion,grip strength and pinch strength,arthritic changes,and adduction *** Based on primary closed reduction maintained,the rate of anatomic reduction is 63.6％.Radiographic fracture union was achieved in all patients at a mean time of 5 *** the final follow-up,there was no difference between the two groups in mean union time and pain levels （P=-0.2）.There was also no difference between the two groups regarding the active range of trapeziometacarpal motion （P=0.3）,grip stength （P=0.6）,pinch strength （P=0.2）,arthritic change and loss of reduction （P=0.2）.There was a significant correlation between adduction deformity and the development of arthritis （P=0.02）.Conclusion Closed reduction mini-external fixator fixation should be first tried to apply in the treatment of Bennett＇s fracture dislocation,and open reduction internal fixation should only be performed for irreducible fractures.

关键词： Bennett fracture external fixator open reduction close reduction traumatic arthritis

Artificial intelligence-assisted repair of peripheral nerve injury: a new research hotspot and associated challenges

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2024年第3期19卷 663-670页

作者： Yang guo Liying Sun wenyao Zhong Nan Zhang Zongxuan Zhao wen tian Department of Hand Surgery Beijing Jishuitan HospitalBeijingChina

Artificial intelligence can be indirectly applied to the repair of peripheral nerve ***,it can be used to analyze and process data regarding peripheral nerve injury and repair,while study findings on peripheral nerve injury and repair can provide valuable data to enrich artificial intelligence *** investigate advances in the use of artificial intelligence in the diagnosis,rehabilitation,and scientific examination of peripheral nerve injury,we used CiteSpace and VOSviewer software to analyze the relevant literature included in the Web of Science from 1994–*** identified the following research hotspots in peripheral nerve injury and repair:(1)diagnosis,classification,and prognostic assessment of peripheral nerve injury using neuroimaging and artificial intelligence techniques,such as corneal confocal microscopy and coherent anti-Stokes Raman spectroscopy;(2)motion control and rehabilitation following peripheral nerve injury using artificial neural networks and machine learning algorithms,such as wearable devices and assisted wheelchair systems;(3)improving the accuracy and effectiveness of peripheral nerve electrical stimulation therapy using artificial intelligence techniques combined with deep learning,such as implantable peripheral nerve interfaces;(4)the application of artificial intelligence technology to brain-machine interfaces for disabled patients and those with reduced mobility,enabling them to control devices such as networked hand prostheses;(5)artificial intelligence robots that can replace doctors in certain procedures during surgery or rehabilitation,thereby reducing surgical risk and complications,and facilitating postoperative *** artificial intelligence has shown many benefits and potential applications in peripheral nerve injury and repair,there are some limitations to this technology,such as the consequences of missing or imbalanced data,low data accuracy and reproducibility,and ethical issues(e.g.,privac

关键词： artificial intelligence artificial prosthesis medical-industrial integration brain-machine interface deep learning machine learning networked hand prosthesis neural interface neural network neural regeneration peripheral nerve

Effect of Long-Term Fertilization on Soil Productivity and Nitrate Accumulation in Gansu Oasis

在线全文

学校读者我要写书评

暂无评论

Agricultural Sciences in China 2006年第1期5卷 57-67页

作者： YANG Sheng-mao LI Feng-min SUO Dong-rang guo tian-wen WANG Jian-guo SONG Bing-ling JIN Shao-ling Institute of Soil and Fertilizer Gansu Academy of Agricultural Sciences Lanzhou 730070 P.R.China The Key Laboratory of Arid and Grassland Agroecology Lanzhou University Ministry of Education Lanzhou 730000 P.R.China Institute of Agricultural Sciences of Zhangye Prefecture Zhangye 734000 PR China

A long-term （1982-2001） field experiment was conducted in a calcareous soil under wheat （Triticum aestivum L.）-wheat （Triticum aestivum L.）-maize （Zea mays L.） rotation system at Zhangye, Gansu Province, China to determine the effects of long-term fertilization on crop yield, nutrients interactions, content and accumulation of nitrate-N in soil profiles. Twenty- four plots in a split-plot factorial with a combination of eight treatments （from nitrogen （N）, phosphorus （P）, potassium （K） and farmyard manure （M） applications） and 3 replications were selected. Main treatments were M and without M, and the sub-treatments were no-fertilizer （CK）, N, NP and NPK. When P and K fertilizers were part of treatments, their ratio to N was 1N：0.22P：0.42K. All M, P and K fertilizers were applied as the basal dressing. The grain yield was harvested each experimental period and straw yield for the period from 1988 to 1997. After crop harvest in 2000, the soil was sampled from the 0-20, 20-60, 60-100, 100-140 and 140-180 cm depths to determine NO3^--N content. Maize yield of CK in 2000 was only 28.2% of that in 1984, and wheat in 2001 was 25.7% of that observed in 1982. Average impact of fertilizers on grain yield decreased in the order of N 〉 M 〉 P 〉 K. Yield response to N and P fertilizers increased with progress of the experiment. The impact of K fertilizer showed no increase in grain yield during the initial 6 years （1982-1987）, moderate increase in the next 5 years （1988-1992）, and considerable increase in the last 9 years （1993-2001）. The straw yield trend was similar to grain yield. Accumulation and distribution of NO3^--N in soil was significantly affected by annual fertilizations. Mineral fertilizers （NP and NPK） led to NO3^- -N accumulation in most subsoil layers, with major impact in the 20-140 cm depth. The combination of mineral fertilizers and farmyard manure （MNP and MNPK） reduced soil NO3^--N accumulation in comparison to mineral fertilizers, It can be argued that long

关键词： long-term fertilization accumulation of nitrate-N crop yields nutrients interactions farmyard manure Nbalance sheet Zhangye Oasis

Electrochemical anodic oxidation assisted fabrication of memristors

在线全文

学校读者我要写书评

暂无评论

International Journal of Extreme Manufacturing 2024年第3期6卷 250-272页

作者： Shuai-Bin Hua tian Jin Xin guo School of Materials Science and Engineering State Key Laboratory of Material Processing and Die&Mould TechnologyHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China

Owing to the advantages of simple structure,low power consumption and high-density integration,memristors or memristive devices are attracting increasing attention in the fields such as next generation non-volatile memories,neuromorphic computation and data ***,the deposition of memristive films often requires expensive equipment,strict vacuum conditions,high energy consumption,and extended processing *** contrast,electrochemical anodizing can produce metal oxide films quickly(e.g.10 s) under ambient *** means of the anodizing technique,oxide films,oxide nanotubes,nanowires and nanodots can be fabricated to prepare *** film thickness,nanostructures,defect concentrations,etc,can be varied to regulate device performances by adjusting oxidation parameters such as voltage,current and *** memristors fabricated by the anodic oxidation technique can achieve high device consistency,low variation,and ultrahigh yield *** article provides a comprehensive review of the research progress in the field of anodic oxidation assisted fabrication of ***,the principle of anodic oxidation is introduced;then,different types of memristors produced by anodic oxidation and their applications are presented;finally,features and challenges of anodic oxidation for memristor production are elaborated.

关键词： anodic oxidation anodized aluminium oxide memristor resistive switching electrical properties

A thermodynamics-based three-scale constitutive model for partially saturated granular materials

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2024年第5期16卷 1813-1831页

作者： Jianqiu tian Enlong Liu Yuancheng guo State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and HydropowerSichuan UniversityChengdu610065China School of Geoscience and Technology Southwest Petroleum UniversityChengdu610500China College of Civil Engineering Zhengzhou UniversityZhengzhou450001China

A three-scale constitutive model for unsaturated granular materials based on thermodynamic theory is *** three-scale yield locus,derived from the explicit yield criterion for solid matrix,is developed from a series of discrete interparticle contact *** three-scale yield locus is sensitive to porosity changes;therefore,it is reinterpreted as a corresponding constitutive model without phenomenological ***,a water retention curve is proposed based on special pore morphology and experimental *** features of the partially saturated granular materials are well captured by the *** wetting and isotropic compression,volumetric compaction occurs,and the degree of saturation ***,the higher the matric suction,the greater the strength,and the smaller the volumetric *** with the phenomenological Barcelona basic model,the proposed three-scale constitutive model has fewer parameters;virtually all parameters have clear physical meanings.

关键词： Unsaturated granular material Unsaturated porous material Geomaterials Multi-scale constitutive model Water retention curve Plasticity

A Fractional-Order Ultra-Local Model-Based Adaptive Neural Network Sliding Mode Control of n-DOF Upper-Limb Exoskeleton With Input Deadzone

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2024年第3期11卷 760-781页

作者： Dingxin He HaoPing Wang Yang tian Yida guo the School of Automation Nanjing University of Science and TechnologyNanjing 210094China IEEE Norinco Group Institute of Navigation and Control Technology Beijing 100089China

This paper proposes an adaptive neural network sliding mode control based on fractional-order ultra-local model for n-DOF upper-limb exoskeleton in presence of uncertainties,external disturbances and input *** the model complexity and input deadzone,a fractional-order ultra-local model is proposed to formulate the original dynamic system for simple controller ***,the control gain of ultra-local model is considered as a *** fractional-order sliding mode technique is designed to stabilize the closed-loop system,while fractional-order time-delay estimation is combined with neural network to estimate the lumped ***,a fractional-order ultra-local model-based neural network sliding mode controller(FO-NNSMC) is ***,to avoid disadvantageous effect of improper gain selection on the control performance,the control gain of ultra-local model is considered as an unknown ***,the Nussbaum technique is introduced into the FO-NNSMC to deal with the stability problem with unknown ***,a fractional-order ultra-local model-based adaptive neural network sliding mode controller(FO-ANNSMC) is ***,the stability analysis of the closed-loop system with the proposed method is presented by using the Lyapunov ***,with the co-simulations on virtual prototype of 7-DOF iReHave upper-limb exoskeleton and experiments on 2-DOF upper-limb exoskeleton,the obtained compared results illustrate the effectiveness and superiority of the proposed method.

关键词： Adaptive control input deadzone model-free control n-DOF upper-limb exoskeleton neural network

Populational change of CD4^(+)CD25^(+)Treg cells is responsible for the synergistic effect of the combination of RAMP2 with baicalin in treating recurrent spontaneous abortion mouse models

在线全文

学校读者我要写书评

暂无评论

Traditional Medicine Research 2024年第8期9卷 59-66页

作者： Cong Chen Zhuo-Lan Li Jing-tian guo wen-Yao Xue Wei guo Department of Gynecology Jiangsu Province Hospital of Chinese MedicineAffiliated Hospital of Nanjing University of Chinese MedicineNanjing 210029China Jiangsu Key Laboratory of Druggability of Biopharmaceuticals State Key Laboratory of Natural MedicinesSchool of Life Science and TechnologyChina Pharmaceutical UniversityNanjing 211198China

Background: The absence of a safe and effective therapy for recurrent spontaneous abortion due to a maternofetal failure in immunological tolerance remains an intractable clinical obstacle for surgeons. Recently, traditional Chinese medicine has become a feasible alternative for certain diseases, including recurrent spontaneous abortion. However, because of the complex composition of the traditional Chinese medicine formula, its action mechanism remains unclear. Methods: We selected two isolated active ingredients (RAMP and baicalin) from the traditional Chinese medicine formula and used an abortion-prone CBA/J × DBA/2 model to simulate human RSA and compared the changes in fetal resorption rate, Treg cell percentage, and relevant cytokines before and after combination therapy. In addition, The mechanisms were preliminarily discussed using in vitro differentiation models. Results: In CBA/J × DBA/2 abortion-prone mice, the combination therapy resulted in a lower embryo resorption rate compared to that obtained with individual delivery of either RAMP or baicalin, thereby playing an embryo-protective role through the increase in Treg cells for the maintenance of maternal-fetal immune tolerance. In in vitro primary cell differentiation experiments, the concentration of Treg cells significantly increased from 11% to 17.9% after the combination therapy compared to that of the single administration group. Conclusion: the synergistic effects of RAMP and baicalin were responsible for Treg differentiation. The present study provides a solid basis for improving the applicability of traditional Chinese herbs in the treatment of recurrent spontaneous abortion.

关键词： recurrent spontaneous abortion Atractylodes macrocephala Koidz. Scutellaria baicalensis Georgi CBA/J×DBA/2 regulatory T cells