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Adaptive modulation for SVD-based MIMO systems with outdated CSI

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The Journal of China Universities of Posts and Telecommunications 2009年第4期16卷 78-83页

作者： YAN Zhi WANG wen-bo WANG xiao-ting ZHENG Kan Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China

The performance of singular value decomposition （SVD）-based multiple-input multiple-output （MIMO） with adaptive modulation （AM） is dependent on the accuracy of the channel state information （CSI） at the transmitter and the receiver. However, for a time-varying channel, the CSI obtained at the transmitter or the receiver is incorrect owing to an inherent delay or error. A typical system employing SVD suffers degradation in capacity when outdated CSI is used to transmit data. This article first addresses the adaptive modulation MIMO system designed under perfect CSI assumption. Based on that, two scenarios of outdated CSI are investigated and analyzed. The effect of imperfect CSI on the system performance is focused on and a simple post processing SNR （pSNR） adjustment design is proposed on AM system in the two scenarios for reducing degradation in average spectral efficiency （ASE）. Simulation results show that these designs provide good performance in an adaptive way, and enable the adaptive MIMO system considerably more to be robust against CSI imperfection.

关键词： MIMO SVD adaptive modulation ohtdated CSI

Insight into the magnetic behavior and magnetocaloric effect of a borophene monolayer

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Communications in Theoretical Physics 2023年第11期75卷 142-151页

作者： Ying An Wei Wang bo-wen xiao Si-yu Huang Zhen-yao Xu School of Science Shenyang University of TechnologyShenyang 110870China School of Electrical Engineering Shenyang University of TechnologyShenyang110870China

The successful discovery of borophene has opened a new door for the development of 2D *** to its excellent chemical,electronic and thermal properties,borophene has shown considerable potential in supercapacitors,hydrogen storage and *** this paper,the thermodynamic characteristics and magnetocaloric effect of borophene are specifically studied using the Monte Carlo *** find that there is an opposite impact between the spin quantum number and the crystal field on the magnetization,magnetic susceptibility,specific heat and magnetic entropy of the ***,increasing the spin quantum number or decreasing the absolute value of the crystal field can improve the relative cooling power,the coercivity(h_(c)),and the remanence(M_(R))and the area of the loop.

关键词： borophene monolayer Ising model magnetic behavior magnetocaloric effect Monte Carlo method

Exploring new physics in ultra-peripheral heavy ion collisions

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Science China(Physics,Mechanics & Astronomy) 2024年第8期67卷 22-22页

作者： bo-wen xiao School of Science and Engineering The Chinese University of Hong KongShenzhen(CUHK-Shenzhen)Shenzhen 518172China

Ultra-peripheral heavy ion collisions involve interactions between heavy ions,such as gold or lead nuclei,at high energies,where the impact parameter is large enough to prevent strong interaction between *** these collisions,the ions pass close enough for their electromagnetic fields to interact,leading to phenomena like photonuclear and two-photon interactions.

关键词： interaction parameter enough

Study on the basic nitrogen compounds from coal-derived oil

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Journal of Coal Science & Engineering(China) 2013年第1期19卷 83-89页

作者： xiao-hui GU Xue-feng MAO Yuan ZHAO wen-bo LI xiao-jing ZHANG State Key Laboratory of Coal Mining and Clean Utilization Beijing Research Institute of Coal Chemistry China CoalResearch Institute Beijing 100013 China

The distillation range analysis and elemental analysis of fractioned direct liquefied oil were conducted. Each fraction of liquefied oil contains some nitrogen compounds. Using the acid extraction method and gas chromatography/mass spectrometry （GC-MS）, the basic nitrogen compounds have been separated and identified. Compared with the nitrogen content of the liquefied oil before and after separation, the basic nitrogen compounds account for more than half of all nitrogen compounds. The basic nitrogen compounds in the light liquefied oil are easily separated, and contain more types of basic nitrogen compounds. The results also show that there are many basic nitrogen compounds in liquefied oil, such as pyrrole, aniline, pyridine, quinoline and so on. However, there are fewer other types of basic nitrogen compounds.

关键词： liquefied oil separation GC-MS nitrogen compounds coal-derived oil

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城市化中农地征用制度的残缺与创新研究

重庆建筑大学学报 2006年第3期28卷 24-28页

作者：胡同泽文晓波重庆大学贸易与行政学院重庆400044

农地征用问题已经成为影响农村社会稳定和城市化进程的首要问题,成为农民维权抗争活动的焦点。农地征用制度的残缺成为妨碍失地农民顺利城市化的关键因素。要改革并完善当前的农地征用制度,分类界定农地征用范围,确立国有土地和集体土... 详细信息

农地征用问题已经成为影响农村社会稳定和城市化进程的首要问题,成为农民维权抗争活动的焦点。农地征用制度的残缺成为妨碍失地农民顺利城市化的关键因素。要改革并完善当前的农地征用制度,分类界定农地征用范围,确立国有土地和集体土地所有权法律地位平等,重构农村土地产权关系,确定土地承包经营权为物权,科学合理论证农地征用补偿标准以及采取多渠道安置办法,并完善司法救济手段。

关键词：农地征用制度集体土地农民共有制物权司法救济

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农地征收过程中的制度失衡与政府责任

行政论坛 2010年第5期17卷 73-75页

作者：文晓波重庆文理学院音乐学院重庆402160

农地征收过程中的制度失衡主要表现为:农地征收范围界定不清楚、征收程序缺乏规范性、国有集体土地地位不平等和征收补偿标准不合理。政府应承担保护失地农民权益的主体责任。在农地征收过程中,政府要树立为人民负责任的意识,创造平等... 详细信息

农地征收过程中的制度失衡主要表现为:农地征收范围界定不清楚、征收程序缺乏规范性、国有集体土地地位不平等和征收补偿标准不合理。政府应承担保护失地农民权益的主体责任。在农地征收过程中,政府要树立为人民负责任的意识,创造平等竞争的市场环境,推行合理的利益补偿机制,健全多渠道利益表达机制,构建切实的社会保障体系。

关键词：农地征收制度失衡政府责任

重庆市失地农民利益保障现状调查及对策研究——以5区2县的实证分析为例

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乡镇经济 2008年第10期24卷 20-23,32页

作者：文晓波重庆文理学院重庆永川402160

文章通过对重庆市5区2县446户的抽样调查问卷和实地访谈进行的实证分析,发现重庆市存在征地程序不透明,征地补偿标准过低,社会保障体系残缺,遗留问题较多,失地农民再就业困难、生活质量下降等问题。建议通过规范细化农地征用程序、建立... 详细信息

文章通过对重庆市5区2县446户的抽样调查问卷和实地访谈进行的实证分析,发现重庆市存在征地程序不透明,征地补偿标准过低,社会保障体系残缺,遗留问题较多,失地农民再就业困难、生活质量下降等问题。建议通过规范细化农地征用程序、建立合理有效补偿机制、赋予农民土地产权地位、健全有效社会保障制度、建立灵活有效就业机制等措施保护失地农民的利益。

关键词：失地农民利益保障现状对策

Gd-EOB-DTPA-enhanced magnetic resonance imaging for bile duct intraductal papillary mucinous neoplasms

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World Journal of Gastroenterology 2015年第25期21卷 7824-7833页

作者： Shi-Hong Ying xiao-Dong Teng Zhao-Ming Wang Qi-Dong Wang Yi-Lei Zhao Feng Chen wen-bo xiao Department of Radiology The First Affiliated Hospital College of Medicine Zhejiang University Department of Pathology The First Affiliated Hospital College of Medicine Zhejiang University

AIM: To investigate gadolinium-ethoxybenzyldiethylenetriamine-pentaacetic acid(Gd-EOB-DTPA)-enhanced magnetic resonance imaging(MRI) of intraductal papillary mucinous neoplasms of the bile duct(IPMN-B). METHODS: The imaging findings of five cases of IPMN-B which were pathologically confirmed at our hospital between March 2012 and May 2013 were retrospectively analyzed. Three of these cases were diagnosed by duodenal endoscopy and biopsy pathology, and two cases were diagnosed by surgical pathology. All five patients underwent enhanced and non-enhanced computed tomography(CT), magnetic resonance cholangiopancreatography, and Gd-EOB-DTPA-enhanced MRI; one case underwent both Gd-EOB-DTPA-enhanced MRI and positron emission tomography-CT. The clinical data and imaging results for these cases were compared and are ***: Conventional imaging showed diffusedilatation of bile ducts and multiple intraductal polypoid and papillary neoplasms or serrated changes along the bile ducts. In two cases, Gd-EOB-DTPA-enhanced MRI revealed dilated biliary ducts and intraductal tumors, as well as filling defects caused by mucin in the dilated bile ducts in the hepatobiliary phase. GdEOB-DTPA-enhanced MRI in one case clearly showed a low-signal tumor in the hepatobiliary phase, similar to what was seen by positron emission tomographyCT. In two patients, routine inspection was unable to discern whether the lesions were inflammation or tumors. However, Gd-EOB-DTPA-enhanced MRI revealed a pattern of gradual enhancement during the hepatobiliary phase, and the signal intensity of the lesions was lower than the surrounding liver parenchyma, suggesting tissue inflammation in both cases, which were confirmed by surgical pathology. CONCLUSION: Gd-EOB-DTPA-enhanced MRI reveals the intraductal mucin component of IPMN-B in some cases and the extent of tumor infiltration beyond the bile ducts in invasive cases.

关键词： Gadolinium-ethoxybenzyl-diethylenetriaminepentaacetic acid Magnetic resonance imaging Magneticresonance cholangiopancreatography Multidetectorcomputed tomography Bile duct neoplasms

东、中、西部失地农民生存状况的对比分析研究——以16省、市、自治区农调队公布的调查报告为例

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特区经济 2007年第4期219卷 138-139页

作者：蒋礼文文晓波重庆文理学院重庆大学贸易与行政学院重庆400044

本文利用16个省、市、自治区农调队对1921失地农户生存状况的抽样调查后公布的数据,对东、中、西部的失地农民失地前后的收入、消费和就业等方面进行对比分析,发现只有部分失地农民顺利地、合理地离开了土地,获得了从事非农业工作的机会... 详细信息

本文利用16个省、市、自治区农调队对1921失地农户生存状况的抽样调查后公布的数据,对东、中、西部的失地农民失地前后的收入、消费和就业等方面进行对比分析,发现只有部分失地农民顺利地、合理地离开了土地,获得了从事非农业工作的机会,收入和消费同步增长,生活质量有一定程度的提高,而大部分失地农民面临收入和消费减少,生活质量下降、再就业困难等共同问题。

关键词：东、中、西部失地农民生存状况对比分析