Investigation of a cross-layer link adaptation algorithm for IEEE 802.11n networks

Link adaptation is a critical component of IEEE 802.11 systems, which adapts transmission rates to dynamic wireless channel conditions. In this paper we investigate a general cross-layer link adaptation algorithm which jointly considers the physical layer link quality and random channel access at the MAC layer. An analytic model is proposed for the link adaptation algorithm. The underlying wireless channel is modeled with a multiple state discrete time Markov chain. Compared with the pure link quality based link adaptation algorithm, the proposed cross-layer algorithm can achieve considerable performance gains of up to 20%.

Wireless machine-to-machine networks 2013

Editorial

Achievable performance gain of IEEE 802.11 multi-rate link adaptation algorithm with cross-layer design

Link quality-based rate adaptation has been widely used for IEEE 802.11 networks. However, network performance is affected by both link quality and random channel access. Selection of transmit modes for optimal link throughput can cause medium access control (MAC) throughput loss. In this paper, we investigate this issue and propose a generalised cross-layer rate adaptation algorithm. It considers jointly link quality and channel access to optimise network throughput. The objective is to examine the potential benefits by cross-layer design. An efficient analytic model is proposed to evaluate rate adaptation algorithms under dynamic channel and multi-user access environments. The proposed algorithm is compared to link throughput optimisation-based algorithm. It is found rate adaptation by optimising link layer throughput can result in large performance loss, which cannot be compensated by the means of optimising MAC access mechanism alone. Results show cross-layer design can achieve consistent and considerable performance gains of up to 20%. It deserves to be exploited in practical design for IEEE 802.11 networks.

Instability of CTG Repeats is Governed by the Position of a DNA Base Lesion through Base Excision Repair

Trinucleotide repeat (TNR) expansions and deletions are associated with human neurodegeneration and cancer. However, their underlying mechanisms remain to be elucidated. Recent studies have demonstrated that CAG repeat expansions can be initiated by oxidative DNA base damage and fulfilled by base excision repair (BER), suggesting active roles for oxidative DNA damage and BER in TNR instability. Here, we provide the first evidence that oxidative DNA damage can induce CTG repeat deletions along with limited expansions in human cells. Biochemical characterization of BER in the context of (CTG)20 repeats further revealed that repeat instability correlated with the position of a base lesion in the repeat tract. A lesion located at the 59-end of CTG repeats resulted in expansion, whereas a lesion located either in the middle or the 39-end of the repeats led to deletions only. The positioning effects appeared to be determined by the formation of hairpins at various locations on the template and the damaged strands that were bypassed by DNA polymerase b and processed by flap endonuclease 1 with different efficiency. Our study indicates that the position of a DNA base lesion governs whether TNR is expanded or deleted through BER.

Systematic review of Late Jurassic sauropods from the Museu Geológico collections (Lisboa, Portugal)

The Museu Geológico collections house some of the first sauropod references of the Lusitanian Basin Upper Jurassic record, including the Lourinhasaurus alenquerensis and Lusotitan atalaiensis lectotypes, previously considered as new species of the Apatosaurus and Brachiosaurus genera, respectively. Several fragmentary specimens have been classical referred to those taxa, but the most part of these systematic attributions are not supported herein, excluding a caudal vertebra from Maceira (MG 8804) considered as cf. Lusotitan atalaiensis. From the material housed in the Museu Geológico were identified basal eusauropods (indeterminate eusauropods and turiasaurs) and neosauropods (indeterminate neosauropods, diplodods and camarasaurids and basal titanosauriforms). Middle caudal vertebrae with lateral fossae, ventral hollow border by pronounced ventrolateral crests and quadrangular cross-section suggest for the presence of diplodocine diplodocids in north area of the Lusitanian Basin Central Sector during the Late Jurassic. A humerus collected from Praia dos Frades (MG 4976) is attributed to cf. Duriatitan humerocristatus suggesting the presence of shared sauropod forms between the Portugal and United Kingdom during the Late Jurassic. Duriatitan is an indeterminate member of Eusauropoda and the discovery of new material in both territories is necessary to confirm this systematic approach. The studied material is in according with the previous recorded paleobiodiversity for the sauropod clade during the Portuguese Late Jurassic, which includes basal eusauropods (including turiasaurs), diplodocids and macronarians (including camarasaurids and basal titanosauriforms).

Primary squamous cell carcinoma of the stomach presenting as a huge retroperitoneal tumor: a case report

A man complained of upper abdominal pain and early satiety for one month. An upper gastrointestinal endoscopy showed nothing special. A CT scan of the abdomen was performed, which demonstrated a huge heterogeneous retroperitoneal mass close to the dorsal wall of the stomach and surrounding the abdominal aortic and celiac trunk. The resected specimen suggested that an irregular tumor invaded the dorsal wall of the stomach. Postoperative histological examination confirmed that it was a gastric squamous cell carcinoma.

Quality evaluation of cortex berberidis from different geographical origins by simultaneous high performance liquid chromatography combined with statistical methods

Purpose: To develop an effective method for evaluating the quality of Cortex berberidis from different geographical origins. Methods: A simple, precise and accurate high performance liquid chromatography (HPLC) method was first developed for simultaneous quantification of four active alkaloids (magnoflorine, jatrorrhizine, palmatine, and berberine) in Cortex berberidis obtained from Qinghai, Tibet and Sichuan Provinces of China. Method validation was performed in terms of precision, repeatability, stability, accuracy, and linearity. Besides, partial least squares discriminant analysis (PLS-DA) and one-way analysis of variance (ANOVA) were applied to study the quality variations of Cortex berberidis from various geographical origins. Results: The proposed HPLC method showed good linearity, precision, repeatability, and accuracy. The four alkaloids were detected in all samples of Cortex berberidis. Among them, magnoflorine (36.46 - 87.30 mg/g) consistently showed the highest amounts in all the samples, followed by berberine (16.00 - 37.50 mg/g). The content varied in the range of 0.66 - 4.57 mg/g for palmatine and 1.53 - 16.26 mg/g for jatrorrhizine, respectively. The total content of the four alkaloids ranged from 67.62 to 114.79 mg/g. Moreover, the results obtained by the PLS-DA and ANOVA showed that magnoflorine level and the total content of these four alkaloids in Qinghai and Tibet samples were significantly higher (p < 0.01) than those in Sichuan samples. Conclusion: Quantification of multi-ingredients by HPLC combined with statistical methods provide an effective approach for achieving origin discrimination and quality evaluation of Cortex berberidis. The quality of Cortex berberidis closely correlates to the geographical origin of the samples, with Cortex berberidis samples from Qinghai and Tibet exhibiting superior qualities to those from Sichuan.

First-Principles Calculations of the Electronic and Structural Properties of GaSb

In this paper, we carried out first-principles calculations in order to investigate the structural and electronic properties of the binary compound gallium antimonide (GaSb). This theoretical study was carried out using the Density Functional Theory within the plane-wave pseudopotential method. The effects ofexchange and correlation (XC) were treated using the functional Local Density Approximation (LDA), generalized gradient approximation (GGA): Perdew–Burke–Ernzerhof (PBE), Perdew-Burke-Ernzerhof revised for solids (PBEsol), Perdew-Wang91 (PW91), revised Perdew–Burke–Ernzerhof (rPBE), Armiento–Mattson 2005 (AM05) and meta-generalized gradient approximation (meta-GGA): Tao–Perdew– Staroverov–Scuseria (TPSS) and revised Tao–Perdew–Staroverov–Scuseria (RTPSS) and modified Becke-Johnson (MBJ). We calculated the densities of state (DOS) and band structure with different XC potentials identified and compared them with the theoretical and experimental results reported in the literature. It was discovered that functional: LDA, PBEsol, AM05 and RTPSS provide the best results to calculate the lattice parameters (a) and bulk modulus (B0); while for the cohesive energy (Ecoh), functional: AM05, RTPSS and PW91 are closer to the values obtained experimentally. The MBJ, Rtpss and AM05 values found for the band gap energy is slightly underestimated with those values reported experimentally.

丹桂籍Dan gui ji.Collection de traités taoïstes.

Contient : I太上感應篇Tai shang gan ying pian.Le Tai shang gan ying pian ; II文昌帝君陰騭文Wen chang di jun yin zhi wen.Traité de la fixation mystérieuse, par le dieu de la Littérature ; III關夫子覺世眞經Guan fu zi jue shi zhen jing.Le livre sacré de l'éveil du monde, de Guan fu zi ; IV關聖帝君降筆眞經Guan sheng di jun jiang bi zhen jing.Livre sacré écrit par le dieu de la Guerre ; V關聖帝君顯應戒士文Guan sheng di jun xian ying jie shi wen.Conseils aux lettrés, traité par le dieu de la Guerre ; VI東嶽聖帝垂訓Dong yue sheng di chui xun.Instructions du dieu du Dong yue ; VII呂純陽祖師勸世戒食牛犬Lü chun yang zu shi quan shi jie shi niu quan.Défense de manger le bœuf et le chien, traité par Lü Chun yang ; VIII文昌孝經Wen chang xiao jing.Livre sacré de la piété filiale, par Wen chang ; IX蕉窓十則Jiao chuang shi ze.Les dix commandements de Jiao tchhoang ; X功過格纂要Gong ge ge zuan yao.Éléments des règles du mérite et du péché ; XI桂香殿功過格Gui xiang dian gong ge ge.Règles du mérite et du péché, de la salle Gui xiang ; XII靈驗記Ling yan ji.Exemples miraculeux ; XIII文昌帝君降乩惜字功罪例Wen chang di jun jiang ji xi zi gong zui li.Règlement du mérite et du péché, relativement au respect des caractères d'écriture ; donné par le dieu de la Littérature ; XIV, livre préliminaire募刊疏引Mu kan su yin.Rapport et introduction sur la gravure de l'ouvrage ; XV, livre préliminaire婁東善書目錄.Lou dong shan shu mu lu.Liste d'ouvrages recommandés, dressée à Lou dong ; XVI, livre préliminaire文昌帝君丹桂籍靈驗記 。續記.Wen chang di jun dan gui ji ling yan ji. Xu ji.Notice des miracles dus au Dan gui ji du dieu delà Littérature, partie principale et suite ; XVII, livre préliminaire顏廷表先生傳.Yan ting biao xian sheng zhuan.Vie de Yan Ting biao ; XVIII, livre préliminaire顏雲麓先生傳.Yan yun lu xian sheng zhuan.Vie de Yan Yun lu ; XIX, livre préliminaire丹桂籍奉行心法.Dan gui ji feng xing xin fa.Préceptes pour pratiquer les règles du Dan gui ji ; XX, livre préliminaire文昌帝君降筆記.Wen chang di jun jiang bi ji.Notice dictée parle dieu de la Littérature ; XXI, livre préliminaire玉皇寶號.Yu huang bao hao.Les noms précieux de Yu huang ; XXII, livres 1-4九天開化主宰元皇司錄宏仁文昌帝君陰隲文註案Jiu tian kai hua zhu zai yuan huang si lu hong ren wen chang di jun yin zhi wen zhu an.Traité de la fixation mystérieuse, par le dieu de la Littérature ; avec commentaires et exemples ; XXIII, livre final文昌帝君救刧寶章Wen chang di jun jiu jie bao zhang.Précieux articles du dieu de la Littérature pour le salut du monde ; XXIV, livre final梓潼帝君降筆戒士子文Zi tong di jun jiang bi jie shi zi wen.Conseils aux lettrés, deux traités par le dieu de la Littérature ; XXV, livre final文昌帝君勸孝文Wen chang di jun quan xiao wen.Traité pour conseiller la piété filiale, par le dieu de la Littérature ; XXVI, livre final玉中書勸孝歌Yu zhong shu quan xiao ge.Chanson pour conseiller la piété filiale ; XXVII, livre final圓明鬥母天尊勸世文.Yuan ming dou mu tian zun quan shi wen.Conseils au monde, traité de la déesse Yuan ming dou mu ; XXVIII, livre final俞淨意先生遇竈神記.Yu jing yi xian sheng yu zao shen ji.Entrevue de Yu Jing yi avec l'esprit du Foyer ; XXIX, livre final袁了凡先生四訓 。立命之學.Yuan liao fan xian sheng si xun. Li ming zhi xue.Quatre exhortations de Yuan Liao fan. Première section : Science de la direction de la vie ; XXX, livre final積善之方Ji shan zhi fang.Deuxième section : Recette pour accumuler les bonnes actions ; XXXI, livre final改過之法Gai ge zhi fa.Troisième section : Moyen de corriger les fautes ; XXXII, livre final謙德之效Qian le zhi xiao.Quatrième section : Manifestation d'humilité ; XXXIII, livre final佛母準提神咒Fo mu zhun ti shen zhou.Invocation de la mère du Bouddha ; XXXIV, livre final袁了凡先生勸喪文Yuan liao fan xian sheng quan sang wen.Traité de Yuan Liao fan sur les funérailles ; XXXV, livre final遏淫說E yin shuo.Traité contre l'impureté ; XXXVI, livre final行不費錢功德例Xing bu fei qian gong de li.Manière d'obtenir des mérites sans dépenser d'argent

丹桂籍Dan gui ji.Collection de traités taoïstes.

Contient : I太上感應篇Tai shang gan ying pian.Le Tai shang gan ying pian ; II文昌帝君陰騭文Wen chang di jun yin zhi wen.Traité de la fixation mystérieuse, par le dieu de la Littérature ; III關夫子覺世眞經Guan fu zi jue shi zhen jing.Le livre sacré de l'éveil du monde, de Guan fu zi ; IV關聖帝君降筆眞經Guan sheng di jun jiang bi zhen jing.Livre sacré écrit par le dieu de la Guerre ; V關聖帝君顯應戒士文Guan sheng di jun xian ying jie shi wen.Conseils aux lettrés, traité par le dieu de la Guerre ; VI東嶽聖帝垂訓Dong yue sheng di chui xun.Instructions du dieu du Dong yue ; VII呂純陽祖師勸世戒食牛犬Lü chun yang zu shi quan shi jie shi niu quan.Défense de manger le bœuf et le chien, traité par Lü Chun yang ; VIII文昌孝經Wen chang xiao jing.Livre sacré de la piété filiale, par Wen chang ; IX蕉窓十則Jiao chuang shi ze.Les dix commandements de Jiao tchhoang ; X功過格纂要Gong ge ge zuan yao.Éléments des règles du mérite et du péché ; XI桂香殿功過格Gui xiang dian gong ge ge.Règles du mérite et du péché, de la salle Gui xiang ; XII靈驗記Ling yan ji.Exemples miraculeux ; XIII文昌帝君降乩惜字功罪例Wen chang di jun jiang ji xi zi gong zui li.Règlement du mérite et du péché, relativement au respect des caractères d'écriture ; donné par le dieu de la Littérature ; XIV, livre préliminaire募刊疏引Mu kan su yin.Rapport et introduction sur la gravure de l'ouvrage ; XV, livre préliminaire婁東善書目錄.Lou dong shan shu mu lu.Liste d'ouvrages recommandés, dressée à Lou dong ; XVI, livre préliminaire文昌帝君丹桂籍靈驗記 。續記.Wen chang di jun dan gui ji ling yan ji. Xu ji.Notice des miracles dus au Dan gui ji du dieu delà Littérature, partie principale et suite ; XVII, livre préliminaire顏廷表先生傳.Yan ting biao xian sheng zhuan.Vie de Yan Ting biao ; XVIII, livre préliminaire顏雲麓先生傳.Yan yun lu xian sheng zhuan.Vie de Yan Yun lu ; XIX, livre préliminaire丹桂籍奉行心法.Dan gui ji feng xing xin fa.Préceptes pour pratiquer les règles du Dan gui ji ; XX, livre préliminaire文昌帝君降筆記.Wen chang di jun jiang bi ji.Notice dictée parle dieu de la Littérature ; XXI, livre préliminaire玉皇寶號.Yu huang bao hao.Les noms précieux de Yu huang ; XXII, livres 1-4九天開化主宰元皇司錄宏仁文昌帝君陰隲文註案Jiu tian kai hua zhu zai yuan huang si lu hong ren wen chang di jun yin zhi wen zhu an.Traité de la fixation mystérieuse, par le dieu de la Littérature ; avec commentaires et exemples ; XXIII, livre final文昌帝君救刧寶章Wen chang di jun jiu jie bao zhang.Précieux articles du dieu de la Littérature pour le salut du monde ; XXIV, livre final梓潼帝君降筆戒士子文Zi tong di jun jiang bi jie shi zi wen.Conseils aux lettrés, deux traités par le dieu de la Littérature ; XXV, livre final文昌帝君勸孝文Wen chang di jun quan xiao wen.Traité pour conseiller la piété filiale, par le dieu de la Littérature ; XXVI, livre final玉中書勸孝歌Yu zhong shu quan xiao ge.Chanson pour conseiller la piété filiale ; XXVII, livre final圓明鬥母天尊勸世文.Yuan ming dou mu tian zun quan shi wen.Conseils au monde, traité de la déesse Yuan ming dou mu ; XXVIII, livre final俞淨意先生遇竈神記.Yu jing yi xian sheng yu zao shen ji.Entrevue de Yu Jing yi avec l'esprit du Foyer ; XXIX, livre final袁了凡先生四訓 。立命之學.Yuan liao fan xian sheng si xun. Li ming zhi xue.Quatre exhortations de Yuan Liao fan. Première section : Science de la direction de la vie ; XXX, livre final積善之方Ji shan zhi fang.Deuxième section : Recette pour accumuler les bonnes actions ; XXXI, livre final改過之法Gai ge zhi fa.Troisième section : Moyen de corriger les fautes ; XXXII, livre final謙德之效Qian le zhi xiao.Quatrième section : Manifestation d'humilité ; XXXIII, livre final佛母準提神咒Fo mu zhun ti shen zhou.Invocation de la mère du Bouddha ; XXXIV, livre final袁了凡先生勸喪文Yuan liao fan xian sheng quan sang wen.Traité de Yuan Liao fan sur les funérailles ; XXXV, livre final遏淫說E yin shuo.Traité contre l'impureté ; XXXVI, livre final行不費錢功德例Xing bu fei qian gong de li.Manière d'obtenir des mérites sans dépenser d'argent

Isospin effect of projectile fragment yields

Isospin asymmetry is very important in the nuclear equation of state (EOS), isotope yield from the projectile fragments can give information of the reaction process. In this paper projectile fragment yields are measured in the collision Ar-36,Ar-40 + Ni-64 at incident energy 50 MeV/u with different isospin asymmetry project Ar-36,Ar-40, data analysis, particle identification and event selection are described. Isotope yields are compared in these two reactions, and axe also compared with the empirical parametrization of fragmentation cross-section calculated by EPAX.

Zhi zu zhai shi ji : 20 juan, xu ji 4 juan, wen ji 6 juan, jin cheng wen ge 2 juan /

Block print.

Hong gong jing shi lu : si juan, fu Yue wu jiu yuan zhang cheng /

Daoguang shi wu nian Gui Liang xu yan ji ke shu shi.

Data compilation on the biological response to ocean acidification: environmental and experimental context of data sets and related literature

The exponential growth of studies on the biological response to ocean acidification over the last few decades has generated a large amount of data. To facilitate data comparison, a data compilation hosted at the data publisher PANGAEA was initiated in 2008 and is updated on a regular basis (doi:10.1594/PANGAEA.149999). By January 2015, a total of 581 data sets (over 4 000 000 data points) from 539 papers had been archived. Here we present the developments of this data compilation five years since its first description by Nisumaa et al. (2010). Most of study sites from which data archived are still in the Northern Hemisphere and the number of archived data from studies from the Southern Hemisphere and polar oceans are still relatively low. Data from 60 studies that investigated the response of a mix of organisms or natural communities were all added after 2010, indicating a welcomed shift from the study of individual organisms to communities and ecosystems. The initial imbalance of considerably more data archived on calcification and primary production than on other processes has improved. There is also a clear tendency towards more data archived from multifactorial studies after 2010. For easier and more effective access to ocean acidification data, the ocean acidification community is strongly encouraged to contribute to the data archiving effort, and help develop standard vocabularies describing the variables and define best practices for archiving ocean acidification data.