期刊文献+
共找到1,819篇文章
< 1 2 91 >
每页显示 20 50 100
关于矩阵多项式Jordan标准形刻画
1
作者 任芳国 王甜甜 《高等数学研究》 2024年第1期18-21,117,共5页
本文利用矩阵运算、矩阵相似关系及矩阵的秩,深化了Jordan矩阵的性质,并在此基础上刻画了矩阵Jordan标准形中Jordan块的个数及阶数,最后讨论了矩阵多项式Jordan标准形,充实了高等代数中Jordan标准形的结果.
关键词 jordan矩阵 矩阵相似关系 矩阵的秩 矩阵多项式
下载PDF
Representations of Hom-Jacobi-Jordan Algebras
2
作者 LIU Zhiqing ZHANG Xiufu 《湖州师范学院学报》 2024年第10期7-13,共7页
Some relationships between the representation of Hom-Jacobi-Jordan algebra and that of Jacobi-Jordan algebra are studied.Moreover,by using the notion ofαk-anti-derivation,a property theorem of multiplicative Hom-Jaco... Some relationships between the representation of Hom-Jacobi-Jordan algebra and that of Jacobi-Jordan algebra are studied.Moreover,by using the notion ofαk-anti-derivation,a property theorem of multiplicative Hom-Jacobi-Jordan algebras is also given. 展开更多
关键词 Jacobi-jordan algebra Hom-Jacobi-jordan algebra REPRESENTATION anti-derivation
下载PDF
The Need for International Cooperation between Israel and Other Middle East Nations to Protect the Jordan River Landscape
3
作者 Kenneth Ray Olson 《Open Journal of Soil Science》 2024年第5期283-307,共25页
The Jordan River, also referred to as Nahr Al Sharieat in Arabic, is a long river in the Middle East that flows from north to south through the Sea of Galilee to the Dead Sea. The Jordan River is bordered by the Golan... The Jordan River, also referred to as Nahr Al Sharieat in Arabic, is a long river in the Middle East that flows from north to south through the Sea of Galilee to the Dead Sea. The Jordan River is bordered by the Golan Heights and the Hashemite Kingdom of Jordan in the east and by Israel and the Palestinian West Bank (Judea and Samaria) in the west. Soil tunnels, including those in the Jordan River watershed and on the Israel, Syria, and Lebanon borders, have a long history of use for warfare, as invasion pathways, smuggling, and storage of rockets, missiles and ordnance and are causes of serious political tension between the countries. Soil tunnel construction and destruction often has adverse environmental and human health impacts in the Jordan River landscape. Due to agricultural wastes, the discharge of untreated sewage, and diversion of saline springs into the river water there has been serious deterioration in the water quality in the lower courses of the Jordan River. The primary objective of this research is to encourage the development of a multi-country clean-up, mitigation, and protection plan for the Jordan River. 展开更多
关键词 jordan River jordan Israel Lebanon SYRIA Dead Sea Sea of Galilee Six-Day War Soil Tunnels
下载PDF
自伴算子的Jordan代数上的双Jordan导子 被引量:1
4
作者 纪培胜 綦伟青 侯恩冉 《青岛大学学报(自然科学版)》 CAS 2009年第3期1-3,42,共4页
设H是一个复Hilbert空间,B(H)s是H上的由自伴算子构成的一个Jordan代数.双线性映射d:B(H)s×B(H)s→B(H)s是B(H)s上的双Jordan导子当且仅当存在虚数λ使得任给a,b∈B(H)s都有d(a,b)=λ(ab-ba).双线性映射d:B(Hs)×B(H)s→B(H)s... 设H是一个复Hilbert空间,B(H)s是H上的由自伴算子构成的一个Jordan代数.双线性映射d:B(H)s×B(H)s→B(H)s是B(H)s上的双Jordan导子当且仅当存在虚数λ使得任给a,b∈B(H)s都有d(a,b)=λ(ab-ba).双线性映射d:B(Hs)×B(H)s→B(H)s是B(H)s上的双广义Jordan导子当且仅当在H上存在有界线性算子x使得任给a,b∈B(H)s都有d(a,b)=axb+bx*a. 展开更多
关键词 jordan代数 jordan导子 双广义jordan导子
下载PDF
基于Born-Jordan分布的LFM-BPSK信号的参数估计
5
作者 张宏业 舒汀 何劲 《现代雷达》 CSCD 北大核心 2024年第11期22-28,共7页
对线性调频-二进制相位编码(LFM-BPSK)复合调制信号的参数估计,现有方法在低信噪比(SNR)环境下估计精度较低。针对该问题,文中推导出了LFM-BPSK信号的Born-Jordan(BJD)时频分布,分析了LFM-BPSK信号的时频特性,并提出了基于BJD时频分布... 对线性调频-二进制相位编码(LFM-BPSK)复合调制信号的参数估计,现有方法在低信噪比(SNR)环境下估计精度较低。针对该问题,文中推导出了LFM-BPSK信号的Born-Jordan(BJD)时频分布,分析了LFM-BPSK信号的时频特性,并提出了基于BJD时频分布的参数估计算法。首先,该算法在BJD时频变换的基础上使用霍夫变换对LFM-BPSK信号初始频率和调频斜率进行估计,并将二维的BJD时频变换转化为一维时域信号,通过降维后的时域信号求解码元宽度;然后,为了探寻参数估计的理论下界,文中还推导了LFM-BPSK信号参数估计的修正克拉美罗下界(MCRLB);最后,利用蒙特卡洛实验对三个参数进行了测试。仿真实验表明,文中算法在低SNR下的参数估计精度明显优于现有的算法,其性能接近MCRLB。 展开更多
关键词 线性调频-二进制相位编码复合调制信号 参数估计 修正克拉美罗下界 Born-jordan时频分布 蒙特卡洛实验
下载PDF
Formation Mechanisms of Some Features in Siliceous Upper Cretaceous-Lower Tertiary Beds of Jordan-Undulations, Geodes, Boudinages
6
作者 Elias Salameh Hani Khoury 《Open Journal of Geology》 CAS 2024年第4期569-577,共9页
Geode, boudinage, and undulation structures are widely distributed in the siliceous beds of the Upper Cretaceous/Tertiary rocks in Jordan. Their formation was attributed to tectonic forces, syngenetic processes, organ... Geode, boudinage, and undulation structures are widely distributed in the siliceous beds of the Upper Cretaceous/Tertiary rocks in Jordan. Their formation was attributed to tectonic forces, syngenetic processes, organic disintegration processes, subaquatic gliding, compaction and settlement, and meteoritic impacts. In this work, the structural features in the siliceous beds of Jordan are attributed to an interplay of load and directed pressures, and mineralogical transformation processes (opal-A to opal-CT to quartz), governed by pH changes. Tectonic directed pressure was acting in an ESE-WSW direction and is common in the silicified limestone of Upper Cretaceous. 展开更多
关键词 UNDULATIONS Geodes Boudinages Opal-A Porcelanite Chert Transformations pH Changes Stress Fields jordan
下载PDF
Impact of climate change on water resources in the Yarmouk River Basin of Jordan
7
作者 Abdelaziz Q BASHABSHEH Kamel K ALZBOON 《Journal of Arid Land》 SCIE CSCD 2024年第12期1633-1647,共15页
Understanding the impact of climate change on water resources is important for developing regional adaptive water management strategies. This study investigated the impact of climate change on water resources in the Y... Understanding the impact of climate change on water resources is important for developing regional adaptive water management strategies. This study investigated the impact of climate change on water resources in the Yarmouk River Basin(YRB) of Jordan by analyzing the historical trends and future projections of temperature, precipitation, and streamflow. Simple linear regression was used to analyze temperature and precipitation trends from 1989 to 2017 at Irbid, Mafraq, and Samar stations. The Statistical Downscaling Model(SDSM) was applied to predict changes in temperature and precipitation from 2018 to 2100 under three Representative Concentration Pathway(RCP) scenarios(i.e., RCP2.6, RCP4.5, and RCP8.5), and the Soil and Water Assessment Tool(SWAT) was utilized to estimate their potential impact on streamflow at Addasiyia station. Analysis of data from 1989 to 2017 revealed that mean maximum and minimum temperatures increased at all stations, with average rises of 1.62℃ and 1.39℃, respectively. The precipitation trends varied across all stations, showing a significant increase at Mafraq station, an insignificant increase at Irbid station, and an insignificant decrease at Samar station. Historical analysis of streamflow data revealed a decreasing trend with a slope of –0.168. Significant increases in both mean minimum and mean maximum temperatures across all stations suggested that evaporation is the dominant process within the basin, leading to reduced streamflow. Under the RCP scenarios, projections indicated that mean maximum temperatures will increase by 0.32℃ to 1.52℃, while precipitation will decrease by 8.5% to 43.0% throughout the 21st century. Future streamflow projections indicated reductions in streamflow ranging from 8.7% to 84.8% over the same period. The mathematical model results showed a 39.4% reduction in streamflow by 2050, nearly double the SWAT model's estimate under RCP8.5 scenario. This research provides novel insights into the regional impact of climate change on water resources, emphasizing the urgent need to address these environmental challenges to ensure a sustainable water supply in Jordan. 展开更多
关键词 streamflow climate change Soil and Water Assessment Tool(SWAT) Statistical Downscaling Model(SDSM) Yarmouk River Basin jordan
下载PDF
δ-Hom-Jordan李超代数的泛中心扩张
8
作者 刘思廷 孙冰 《东北师大学报(自然科学版)》 CAS 北大核心 2024年第3期5-10,共6页
对δ-Hom-Jordan李超代数的泛中心扩张理论进行了研究,得出两个δ-Hom-Jordan李超代数的中心扩张的复合并不是中心扩张,从而引进了α-中心扩张的定义,进而定义泛α-中心扩张,并且构造出δ-Hom-Jordan李超代数的泛中心扩张.
关键词 泛中心扩张 泛α-中心扩张 δ-Hom-jordan李超代数
下载PDF
Assessment of Heavy Metals Contamination of Topsoil and Street Dust around Cement Factory in Southern Jordan
9
作者 Omar Ali Al-Khashman Alia Omar Al-Khashman +2 位作者 Navasingh Rajesh Jesudoss Hynes Hani M. Alnawafleh Pitchumani Shenbaga Velu 《Journal of Environmental Protection》 2024年第6期672-696,共25页
Evaluation of assessment of the metal processes governing the metals distribution in soil and dust samples is very significant and protects the health of human and ecological system. Recently, special attention has gi... Evaluation of assessment of the metal processes governing the metals distribution in soil and dust samples is very significant and protects the health of human and ecological system. Recently, special attention has given to the assessment of metals pollution impact on soil and dust within industrial areas. This study aims to assess the metal contamination levels in the topsoil and street dust around the cement factory in Qadissiya area, southern Jordan. The levels of seven metals (namely Fe, Zn, Cu, Pb, Cr, Cd, and Mn) were analyzed using Flame Atomic Absorption Spec-trophotometer (FAAS) to monitor, evaluate, and to compare topsoil and road dust pollution values of metals of the different types of urban area. The physicochemical parameters which believed to affect the mobility of metals in the soil of the study area were determined such as pH, EC, TOM, CaCO3 and CEC. The levels of metal in soil samples are greater on the surface but decrease in the lower part as a result of the basic nature of soil. The mean values of the metals in soil can be arranged in the following order: Zn > Pb > Mn > Fe > Cu > Cr > Cd. The relatively high concentration of metals in the soil sample was attributed to anthropogenic activities such as traffic emissions, cement factory and agricultural activities. Correlation coefficient analysis and the spatial distribution of indices and the results of statistical analysis indicate three groups of metals: Fe and Mn result by natural origin, Zn, Pb, Cu and Zn result by anthropogenic origin (mainly motor vehicle traffic and abrasion of tires) while Cd is mixed origin. The higher content level values of metals of anthropogenic source in soil samples indicate that it is a source of contamination of air in the studied area. . 展开更多
关键词 Cement Dust Heavy Metals Contamination Risk Assessment Statistical Analysis jordan
下载PDF
Public knowledge about and attitudes toward organ donation, and public barriers to donate in Jordan: A cross-sectional study
10
作者 Adham Al-Salhi Elham H Othman 《World Journal of Transplantation》 2024年第4期110-122,共13页
BACKGROUND Organ donation is a critical issue that is receiving greater attention worldwide.In Jordan,the public’s knowledge about and attitudes toward organ donation play a significant role in the availability of or... BACKGROUND Organ donation is a critical issue that is receiving greater attention worldwide.In Jordan,the public’s knowledge about and attitudes toward organ donation play a significant role in the availability of organs for transplantation.AIM To assess the public knowledge about and attitudes toward organ donation in Jordan.METHODS A cross-sectional design was used to collect data from 396 Jordanian citizens via an online self-reported questionnaire.RESULTS Overall,396 participants were recruited.Of the entire sample,93.9%of the participants had heard about and had sufficient knowledge about organ donation but they had limited knowledge about brain death.The most common source of information about organ donation was social media networks.Females were found to score significantly higher than males for attitude.Those who had thought about organ donation or registered their names to donate scored signi-ficantly higher in terms of attitudes to donation than their counterparts who had not.The most common reasons for limited organ donation practices in Jordan were a lack of awareness programs and insufficient knowledge in society.CONCLUSION Greater public understanding of organ donation appears to be associated with more positive attitudes toward organ donation.Most participants responded positively regarding their attitude toward organ donation as they believed that this action could give another person a chance to live.Moreover,most agreed that they would donate their organs after their death.Otherwise,the participants had limited general knowledge about brain death,and most had not registered their names to donate their organs.These findings indicate the need for public awareness campaigns and educational programs to encourage more people to become organ donors. 展开更多
关键词 ATTITUDE Barriers jordan KNOWLEDGE Organ donation PUBLIC
下载PDF
The Influence of Information Technology(IT)on Accrual Accounting Adoption:The Case of the Jordanian Public Sector
11
作者 Moawiah Awad Alghizzawi Rosnia Masruki 《Journal of Modern Accounting and Auditing》 2024年第2期40-48,共9页
Jordan is one of many countries that intends to reform its public sector by adopting accrual accounting,which is primarily carried out through the International Public Sector Accounting Standards(IPSAS)implementation ... Jordan is one of many countries that intends to reform its public sector by adopting accrual accounting,which is primarily carried out through the International Public Sector Accounting Standards(IPSAS)implementation plan,scheduled to be completed by 2021.Considering the difficulties of adoption,this process cannot be completed without an appropriate Information Technology(IT)system capable of providing the accounting information required for this reform.Therefore,this study aims to examine the influence of IT on accrual accounting adoption in the Jordanian public sector.The study employed the quantitative survey approach.Based on 331 usable questionnaires,the descriptive findings showed that the use of IT in the Jordanian public sector is relevant to daily accounting transactions in general and to accrual accounting in particular.The regression analysis showed a positive,significant relationship between IT use and accrual accounting practice.The IT specialist should be able to understand the needs of public sector in adopting accrual-based accounting.In line with today’s digitalization age,which integrates advanced technologies and numerous techniques,this study suggests that a combination of accounting and IT experts is a value added to sharpen the competitiveness of public sector reform.This study contributes to the extant literature in public sector,concerning the relationship between IT and accrual accounting adoption in the context of Jordan. 展开更多
关键词 public sector accrual accounting adoption information technology jordan
下载PDF
The Impact of Transformational Leadership on Commitment to Change Among Jordanian Government Accountant Toward IPSAS Implementation
12
作者 Mohammad Abu Zraiq Rosnia Masruki 《Journal of Modern Accounting and Auditing》 2024年第3期73-88,共16页
IPSAS was accepted by Jordan’s government in accordance with worldwide trends.The Jordanian Ministry of Finance launched cash-basis IPSAS in 2015 and planned to implement accrual accounting by January 1,2021.However,... IPSAS was accepted by Jordan’s government in accordance with worldwide trends.The Jordanian Ministry of Finance launched cash-basis IPSAS in 2015 and planned to implement accrual accounting by January 1,2021.However,the commitment to change remains uneven,hindering the full shift.Moving from old accounting processes to new ones is tough.Even then,it hasn’t been implemented,creating a gap due to the difficulty in committing to new accounting standards throughout implementation due to obstacles.Thus,knowing government accountants’issues is essential to applying IPSAS in government accounting.This study examines how transformational leadership affects government accountants’commitment to IPSAS adoption in Jordan’s public sector.This study used a quantitative approach to survey Jordanian Ministry of Finance accountants.The 384-person study had a 78%response rate.Additionally,PLS-SEM was used to confirm variable relationships.Transformational leadership positively predicted IPSAS implementation,according to the study. 展开更多
关键词 IPSAS commitment to change transformational leadership government accountant Ministry of Finance jordan
下载PDF
Jordan矩阵的幂
13
作者 晏林 《文山师范高等专科学校学报》 2006年第2期94-95,共2页
利用数学归纳法给出复数域上Jordan矩阵的幂,并给出两种证明方法。
关键词 jordan矩阵 jordan矩阵的幂 jordan标准形
下载PDF
Erosion Rates in Dam Catchments in Jordan—Effects of Topography, Geology, and Urbanizations
14
作者 Elias Salameh Hakam Al-Alami Ibraheem Hamdan 《Open Journal of Soil Science》 2024年第5期319-331,共13页
Erosion as a natural process produces soils, which are very important natural resources for the fest land plant- and animal kingdoms. Loss of the soil cover reduces agricultural production, biodiversity, and the role ... Erosion as a natural process produces soils, which are very important natural resources for the fest land plant- and animal kingdoms. Loss of the soil cover reduces agricultural production, biodiversity, and the role of soil as a filter for infiltrating water to replenish the groundwater. It also threatens the food supplies. The knowledge of erosion rates of rocks and terrains is important for developing proactive measures to protect soils from erosion and loss. In this study, erosion rates of catchment areas were calculated based on dams’ catchment extensions and the sediment loads transported by flood flows into dams’ lakes. The study results show that the chemically, via floodwater, transported quantities of materials are negligible compared to the solid materials transported by the water. It calculates erosion rates ranging from 0.013 to 0.212 mm/yr (13 - 212 m/10<sup>6</sup> yr) for the different catchment areas. Erosion rates in Jordan are, generally, higher than those calculated for the different parts of the world ranging from 2.5 to 60 m/10<sup>6</sup> yr. This fact can be explained by the very steep topography, calcareous rock cover of the catchment areas and the barren rock exposures. 展开更多
关键词 Erosion Rates jordan DAMS Sediment Load
下载PDF
Jordan三系的次理想的几个性质(英文) 被引量:3
15
作者 张知学 董磊 《河北大学学报(自然科学版)》 CAS 2002年第3期215-218,共4页
首先给出了Jordan三元系的次理想的定义与Jordan三元系的次理想的几条简单性质 ,举例说明了次理想与理想是 2个不同的概念 .然后 ,对一类重要的Jordan三元系———正则Jordan三元系 ,证明了它的次理想成为理想的几个充分条件 .
关键词 jordan三元系 次理想 正则jordan三元系 充分条件
下载PDF
三角代数上的Jordan-triple初等映射及Jordan同构 被引量:3
16
作者 魏妙 张建华 《纺织高校基础科学学报》 CAS 2009年第2期193-197,共5页
设U是三角代数,V为任意代数,证明了若映射M:U→V,M*:V→U为满射,并且满足Jordan-trip le初等映射的形式,则M,M*可加.并进一步讨论了映射M,M*在什么条件下具有Jordan同构形式.
关键词 三角代数 jordan—triple初等映射 可加性 jordan同构
下载PDF
Jordan矩阵的应用
17
作者 伊继昆 《玉溪师范学院学报》 1995年第4期16-21,共6页
1 引言 我们知道,在复数域范围内,对任意方阵A,总存在非奇异矩阵P,使P<sub>-1</sub>
关键词 jordan矩阵 jordan标准形 jordan 特征值 jordan 幂零阵 上三角阵 非奇异矩阵 矩阵方程 初等因子
下载PDF
用幂零指数的分布规律求Jordan基 被引量:4
18
作者 刘学质 《西南师范大学学报(自然科学版)》 CAS CSCD 北大核心 2005年第6期1005-1008,共4页
研究了线性无关的向量组在同一级幂零指数上的线性关系,得到幂零指数在线性空间的基向量上的分布规律.由此导出了将根子空间的一个任意的基的向量用幂零线性变换和向量的线性组合改造为Jordan基的方法.
关键词 幂零指数 局部线性相关性 jordan标准形 jordan 过渡矩阵
下载PDF
Jordan标准形矩阵的性质及应用 被引量:3
19
作者 李桂荣 孙杰 刘耀斌 《德州学院学报》 2003年第4期20-23,37,共5页
给出了Jordan块的变化规律,利用这些规律及Jordan标准形得出了重要的Hamilton-Cayley定 理,研究了Jordan标准形在矩阵分解、求解线性微分方程组中的应用.
关键词 jordan jordan标准形 Hamilton-Cayley定理
下载PDF
Jordan映射的超稳定性 被引量:1
20
作者 吕纪荣 曹怀信 《纺织高校基础科学学报》 CAS 2009年第4期421-425,共5页
基于ε-同态,Jordan映射,ε-近似Jordan映射,强ε-近似Jordan映射,ε-准Jordan映射的概念,给出了ε-近似Jordan映射超稳定性的定义.在此基础上给出映射超稳定性的一些充分条件,以及在某个适当条件下ε-近似Jordan映射是保k次方的(k∈N+).
关键词 jordan映射 ε-近似jordan映射 超稳定性
下载PDF
上一页 1 2 91 下一页 到第
使用帮助 返回顶部