检索结果-南通市图书馆

新旅游资源观下的乡村旅游地耕地多功能权衡/协同关系研究——以江西省中源乡为例

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

自然资源学报 2024年第4期39卷 804-822页

作者：徐国良赵婵娟刘钰万沛钰江西财经大学财税与公共管理学院南昌330013 江西省吉安市新干县自然资源局吉安331300

揭示乡村旅游地耕地多功能权衡/协同关系,可拓展耕地资源理论认知的多维性,深化耕地资源有序利用的多样性。以江西省典型乡村旅游地中源乡为例,在格网尺度上开展耕地多功能定量评价、影响因素及权衡/协同分析。结果表明:(1)研究期内,耕... 详细信息

揭示乡村旅游地耕地多功能权衡/协同关系,可拓展耕地资源理论认知的多维性,深化耕地资源有序利用的多样性。以江西省典型乡村旅游地中源乡为例,在格网尺度上开展耕地多功能定量评价、影响因素及权衡/协同分析。结果表明:(1)研究期内,耕地综合功能及文化功能指数上升,但生产、生活、生态功能指数下降。(2)在快速发展期,耕地多功能空间格局分异主要受自然条件因子之间的交互影响,而巩固发展期自然条件、空间区位及旅游发展因子共同交互作用愈发明显。(3)耕地多功能之间的权衡关系不明显、协同关系普遍,并且随着乡村旅游地发展阶段由快速发展期迈入巩固发展期,耕地多功能之间协同度最高也由“生产—生活”转为“生产—文化”。

关键词：耕地多功能权衡/协同乡村旅游地新旅游资源观

在线全文

学校读者我要写书评

暂无评论

数字经济赋能工业高质量发展的实证研究

南宁师范大学学报（自然科学版） 2024年第2期41卷 121-131页

作者：赵鹏许国亮赵丽南宁师范大学经济与管理学院广西南宁530001

数字经济是工业发展的强大助力,探究数字经济推动中国工业高质量发展已成为重要课题。基于中国267个地级市2011—2019年的面板数据,采用分位数回归模型、门槛效应模型和空间杜宾模型,实证检验数字经济对工业高质量发展的影响机制和空间... 详细信息

数字经济是工业发展的强大助力,探究数字经济推动中国工业高质量发展已成为重要课题。基于中国267个地级市2011—2019年的面板数据,采用分位数回归模型、门槛效应模型和空间杜宾模型,实证检验数字经济对工业高质量发展的影响机制和空间溢出效应,探讨政府创新偏好对数字经济与工业高质量发展的非线性调节作用的研究发现:数字经济对工业高质量发展的促进作用存在边际效应递增的非线性特征;政府创新偏好存在强化数字经济促进工业高质量发展的非线性调节作用;数字经济对邻近地区工业高质量发展存在虹吸效应。因此,要统筹各地数字经济发展,发挥地方政府的主体作用,弥合数字鸿沟,充分利用数字经济对工业高质量发展的边际递增效应。

关键词：数字经济工业高质量发展政府创新偏好非线性调节作用门槛效应模型空间杜宾模型

Geohazards and risk assessment along highway in Sichuan Province, China

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 Mountain Science 2023年第6期20卷 1695-1711页

作者： YANG Hong-zhi DONG Jia-yu guo xu-liang School of Highway Chang’an UniversityXi'an 710064China

Geohazards along highways are the main natural hazards that could affect the safety and operation of highway *** the risks faced by highways in areas affected by geohazards is an urgent problem to be *** study used historical geohazard events from Sichuan Province and highway network data to propose a geohazard risk index that reflects the risk geohazards along ***,this work applied the entropy method and expert scoring to calculate the weight of the *** spatial distributions of landslides,debris flows,collapses,and unstable slopes along the highways were analysed based on ArcGIS spatial statistics,and the highway geohazard intensity index were *** relationships between slope,rainfall,vegetation coverage,rock type,land use,and incision depth with geohazards were analysed,and the highway geohazard susceptibility index was calculated by the weighted information *** on the intensity and susceptibility index,we obtained a geohazard risk index which can better evaluate the risk of highways,and made a highway geohazard risk map to aid the prevention and mitigation of geohazards along highways and assist with highway network planning.

关键词： Geohazards Highway network Geohazard risk index Intensity index Susceptibility

Real Heat Flux Analysis of Continuously Casting Round Billet

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2008年第1期15卷 25-29页

作者： ZHAN Hui-ying WANG xu-dong guo liang-liang YAO Man School of Material Science and Engineering Dalian University of Technology Dalian 116024 Liaoning China

The distributions of heat flux along the height and the circumferential direction of round billet mould were measured *** influence of casting speed,carbon content,powder,and pouring temperature on the average longitudinal and circumferential heat flux in the ＂high heat flux region＂ was *** experimental and analytical results provide a basis for an intelligent mould with online detection of defects,adjustment of operational parameters,optimization of the monitoring system,and even prediction of abnormal heat transfer.

关键词： continuous casting mould heat flux round billet

Effect of lactulose on establishment of a rat non-alcoholic steatohepatitis model

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2005年第32期11卷 5053-5056页

作者： Jian-Gao Fan Zheng-Jie xu guo-liang Wang Department of Gastroenterology Shanghai First People's Hospital Jiaotong University Shanghai 200080 China

AIM： To explore the relationship between changes of intestinal environment and pathogenesis of non-alcoholic steatohepatitis （NASH）. METHODS： Forty-two Sprague-Dawley rats were randomly dMded into model group （n = 24）, treatment group （n = 12）, and control group （n = 6）. The rats of model and treatment groups were given high-fat diet, and those of the control group were given normal diet. Furthermore, the rats of treatment group were given lactulose after 8 wk of high-fat diet. Twelve rats of the model group were killed at 8 wk of high-fat diet. At the 16 wk the rats of treatment group, control group, and the rest of the model group were killed. The serum levels of aminotransferase were measured and the histology of livers was observed by H＆E staining. RESULTS： The livers of rats presented the pathological features of steatohepatitis with higher serum levels of alanine aminotransferase （ALT） and aspartate aminotransferase （AST） in the model group after 16 wk. Compared to the model group, the serum levels of ALT and AST in treatment group decreased significantly and were close to the normal group, and the hepatic inflammation scores also decreased markedly than those in the model group after 16 wk （5.83±2.02 vs 3.63±0.64, P〈0.05）, but were still higher than those in the model group after 8 wk （3.63±0.64 vs 1.98±0.90, P〈0.05）. However, the degree of hepatic steatosis had no changes in treatment group compared to the model group after 16 wk. CONCLUSION： Lactulose could ameliorate the hepatic inflammation of rats with steatohepatitis induced by fat- rich diet, but could not completely prevent the development of steatohepatitis. It is suggested that intestinal environmental changes such as intestinal bacteria overgrowth, are one of the important factors in the pathogenesis of NASH.

关键词： NASH Lactulose Intestinal environment

Response of soil fauna to simulated nitrogen deposition: A nursery experiment in subtropical China

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

Journal of Environmental Sciences 2007年第5期19卷 603-609页

作者： xu guo-liang MO Jiang-ming FU Sheng-lei PER Gundersen ZHOU guo-yi xuE Jing-Hua Institute of Ecology South China Botanical Garden Chinese Academy of Sciences Guangzhou 510650 China Graduate School of the Chinese Academy of Sciences Beijing 100039 China Danish Center for Forest Landscape and Planning KVL Hoersholm Kongevej 11 DK-2970 Hoersholm Denmark

We studied the responses of soil fauna to a simulated nitrogen deposition in nursery experimental plots in Subtropical China. Dissolved NH4NO3 was applied to the soil by spraying twice per month for 16 months, starting January 2003 with treatments of 0, 5, 10, 15 and 30 gN/（m^2·a）. Soil fauna was sampled after 6, 9, 13 and 16 months of treatment in three soil depths （0-5 cm, 5-10 cm, 10-15 cm）. Soil available N increased in correspondence with the increasing N treatment, whereas soil pH decreased. Bacterial and fungal densities were elevated by the N treatment. Soil fauna increased in the lower nitrogen treatments but decreased in the higher N treatments, which might indicate that there was a threshold around 10 gN/（m^2·a） for the stimulating effects of N addition. The N effects were dependent on the soil depth and sampling time. The data also suggested that the effects of the different N treatments were related to the level of N saturation, especially the concentration of NO3^- in the soil.

关键词： soil fauna N deposition response Subtropical China

Approximation Algorithms for Steiner Connected Dominating Set

在线全文

学校读者我要写书评

暂无评论

Journal of Computer Science & Technology 2005年第5期20卷 713-716页

作者： Ya-Feng Wu Yin-Long xu guo-liang Chen National High Performance Computing Center at Hefei Department of Computer Science and Technology University of Science and Technology of China Hefei 230027 P.R. China

Steiner connected dominating set （SCDS） is a generalization of the famous connected dominating set problem, where only a specified set of required vertices has to be dominated by a connected dominating set, and known to be NP- hard. This paper firstly modifies the SCDS algorithm of Guha and Khuller and achieves a worst case approximation ratio of （2 ＋ 1/（m - 1））H（min（△, k））＋O（1）, which outperforms the previous best result （c ＋ 1）H（min（△, k））＋ O（1） in the case of m ≥ 1 ＋1/（c - 1）, where c is the best approximation ratio for Steiner tree, A is the maximum degree of the graph, k is the cardinality of the set of required vertices, m is an optional integer satisfying 0 ≤ m ≤ min（△, k） and H is the harmonic function. This paper also proposes another approximation algorithm which is based on a greedy approach. The second algorithm can establish a worst case approximation ratio of 2 ln（min（△, k））＋ O（1）, which can also be improved to 2 lnk if the optimal solution is greater than c·e^2c＋1/2（c＋1）.

关键词： approximation algorithm Steiner connected dominated set graph algorithm NP-hard

Preliminary Response of Soil Fauna to Simulated N Deposition in Three Typical Subtropical Forests

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

Pedosphere 2006年第5期16卷 596-601页

作者： xu guo-liang MO Jiang-Ming ZHOU guo-Yi FU Sheng-Lei Institute of Ecology South China Botanical Garden Chinese Academy of Sciences Guangzhou 510650 （China） Graduate School of the Chinese Academy of Sciences Beijing 100039 （China）

A field-scale experiment arranged in a complete randomized block design with three N addition treatments including a control (no addition of N), a low N (5 g m-2 year-1), and a medium N (10 g m-2 year-1) was performed in each of the three typical forests, a pine (Pinus massoniana Lamb.) forest (PF), a pine-broadleaf mixed forest (MF) and a mature monsoon evergreen broadleaf forest (MEBF), of the Dinghushan Biosphere Reserve in subtropical China to study the response of soil fauna community to additions of N. Higher NH4+ and NO3- concentrations and a lower soil pH occurred in the medium N treatment of MEBF, whereas the NO3- concentration was the lowest in PF after the additions of N. The response of the density, group abundance and diversity index of soil fauna to addition of N varied with the forest type, and all these variables decreased with increasing N under MEBF but the trend was opposite under PF. The N treatments had no significant effects on these variables under MF. Compared with the control plots, the medium N treatment had significant negative effect on soil fauna under MEBF. The group abundance of soil fauna increased significantly with additions of higher N rates under PF. These results suggested that the response of soil fauna to N deposition varied with the forest type and N deposition rate, and soil N status is one of the important factors affecting the response of soil fauna to N deposition.

关键词： Dinghushan Biosphere Reserve N deposition soil fauna subtropical China

Surgical treatment of double outlet ventricle: report on 72 cases

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2005年第4期118卷 344-347页

作者： YANGJin-fu HUDong-xu HUJian-guo YINBang-liang ZHOUXin-min ZHOUWen-wu TANSi-chuang YINNi DepartmentofCardiothoracicSurgery SecondXiangyaHospitalCentralSouthUniversityChangsha410011China

Double outlet ventricle (DOV) is defined as a congenital heart disease with: ( 1) both, great arteries arising completely, or almost completely (greater than or equal to 90%), from a single ventricle ( usually, right ventricle); ( 2) an aortic valve having no fibre connection with mitral valve; and (3) the only outlet of the other ventricle is a ventricular septal defect (VSD). The incidence of DOV accounts for 1% of all congenital heart disease.(1) Clinically there are three common types: Fallot type or double outlet right ventricle (DORV) with subaortic VSD with pulmonary stenosis; Eisenmenger type or DORV with subaortic VSD without pulmonary stenosis and Taussig-Bing type or DORV with subpulmonary VSD. Operative techniques are different according to the position of the VSD and great arteries and the presence or absence of ventricular outflow tract obstruction. The operative difficulty increases in the presence of coronary artery malformation. Recently, our research centre has treated 72 cases of patients suffering from double outlet ventricle. This article is the report of the operative methods and the outcomes.

关键词： congenital double outlet ventricle surgical treatment