660,399 research outputs found
Single- and Multi-carrier Quadrature Amplitude Modulation: Principles and Applications for Personal Communications, WATM and Broadcasting: 2nd
No full textSingle- and Multi-carrier Quadrature Amplitude Modulation Principles and Applications for Personal Communications, WLANs and Broadcasting L. Hanzo Department of Electronics and Computer Science, University of Southampton, UK W. Webb Motorola, Arlington Heights, USA formerly at Multiple Access Communications Ltd, Southampton, UK T. Keller Ubinetics, Cambridge Technology Centre, Melbourn, UK formerly at Department of Electronics and Computer Science, University of Southampton, UK Motivated by the rapid evolution of wireless communication systems, this expanded second edition provides an overview of most major single- and multi-carrier Quadrature Amplitude Modulation (QAM) techniques commencing with simple QAM schemes for the uninitiated through to complex, rapidly-evolving areas, such as arrangements for wide-band mobile channels. Targeted at the more advanced reader, the multi-carrier modulation based second half of the book presents a research-orientated outlook using a variety of novel QAM-based arrangements. * Features six new chapters dealing with the complexities of multi-carrier modulation which has found applications ranging from Wireless Local Area Networks (WLAN) to Digital Video Broadcasting (DVB) * Provides a rudimentary introduction for readers requiring a background in the field of modulation and radio wave propagation * Discusses classic QAM transmission issues relevant to Gaussian channels * Examines QAM-based transmissions over mobile radio channels * Incorporates QAM-related orthogonal techniques, considers the spectral efficiency of QAM in cellular frequency re-use structures and presents a QAM-based speech communications system design study * Introduces Orthogonal Frequency Division Multiplexing (OFDM) over both Gaussian and wideband fading channels By providing an all-encompassing self-contained treatment of single- and multi- carrier QAM based communications, a wide range of readers including senior undergraduate and postgraduate students, practising engineers and researchers alike will all find the coverage of this book attractive
Leucogaster solidus L. Fan & T. Li 2021, sp. nov.
No full textLeucogaster solidus L. Fan & T. Li sp. nov.(Fig. 2) MycoBank:— MB 839331 Diagnosis:—Basidiome brown to reddish brown, verrucose, gleba non-gelatinous, peridium (90–)110–250 μm thick, trama 20–42.5 μm thick, basidiospores large, globose to subglobose with alveolate ornamentation. Etymology:— solidus, refers to the solid and non-gelatinous gleba when fresh. Holotype:— CHINA. Yunnan Province, Kunming City, in soil under mixed woodlands, dominated by Pinus armandii, 28 December 2012, collected by L. Fan and J. Z. Cao (BJTC FAN733, ITS = MW 938546). Description:— Basidiome hypogeous, subglobose to globose, 0.7–0.9 cm diam, brown to reddish brown when fresh, dark blackish brown to fuscous red when dry, surface verrucose, with a shallow depression at the base. Peridium (90–)110–250 μm thick, reddish brown, composed of interwoven hyphae, hyphae hyaline, 1–1.5 μm broad, not inflated, turning pink in 3% KOH, tissue near surface obscured by red pigment that forms red to dark red “pigment balls” in Melzer’s reagent. Gleba solid, whitish when fresh, light yellow-brown when dry, loculate, locules vary in size, fine alveolate-reticulate, non-gelatinous when fresh, not exuding sticky latex when damaged. Trama thin, 20–42.5 μm thick, composed of hyphae of 2.5–3.5 μm broad, hyphae hyaline, thin-walled, septa. Hymenium absent. Basidia not seen. Basidiospores globose to subglobose, colorless, [30/1/1] 12–14(–16) × 11–14 μm, Q(L/I) = 1.01–1.18, Q m = 1.07 ± 0.05, including ornamentation of less than 0.5 μm high, consisting of an irregular alveolate reticulum formed by anastomosed ridges, gelatinous perisporium absent, hilar appendix or sterigmal scars not found. Habit, habitat and distribution:—hypogeous, in the soil under mixed forest, dominated by Pinus armandii Franch., Yunnan Province, China.Published as part of Li, Ting, Fu, Hao-Yu & Fan, Li, 2021, Leucogaster solidus sp. nov. (Albatrellaceae, Russulales) from China, pp. 85-92 in Phytotaxa 508 (1) on pages 89-90, DOI: 10.11646/phytotaxa.508.1.8, http://zenodo.org/record/542581
Kwalita’ tal-ħajja għat-tarbija li se titwieled
Get PDFFl-aħħar ħmistax-il sena psikologi ewlenin ikkonfermaw permezz ta’riċerka medika u l-esperjenza klinika li t-tarbija fil-ġuf tisma ', ittiegħem,
tħoss, u titgħallem; u dak li tesperjenza jibda jifforma l-attitudnijiet u l-aspettattivi tagħha dwarha nnifisha. Huwa ta 'importanza kbira allura, li
aħna nifhmu dan is-suġġett tajjeb biżżejjed, biex inkunu nistgħu nipprovdu l-aħjar ambjent u ħajja ta’ kwalita’ għat-tarbija fil-ġuf.
Iżda ħa niehdu pass wieħed wara l-ieħor ... Nixtieq li naqsam dawn il-ftit ħsibijiet magħkom, liebsa l-kpiepel differenti tiegħi ta’ social worker u
akkademika fil-qasam, ħaddiema volontarja maż-żgħażagħ u adulti għal ħafna snin, chairperson tal-kummissjoni nazzjonali familja - fejn aħna
nikkonċernaw ruhna dwar il-benesseri tal-membri kollha tal-familja – u fl-aħħar u mhux l-inqas omm ta 'żewġt itfal u omm li esperjenzajt it-telfa u
l-uġigħ ta’ miscarriage. Dan ma kienx sempliċiment esperjenza medika, iżda esperjenza profondament emozzjonali!
Jiena ħdimt u għadni naħdem ma' żgħażagħ u adulti li jkunu qed jesperjenzaw sens profond ta' rifjut, ansjetà, sens li qatt ma jistgħu jogħġbu lil
ħadd, wisq inqas lilhom infushom. Permezz ta’ ħidma intensiva, spiss jirnexxielna nittraċċaw l-għeruq ta 'dawn il-kwistjonijiet, għall-ħajja
tagħhom fil-ġuf. Tfal mhux mixtieqa, tfal mhux ippjanati; tfal li ommhom riedu jabortixxu; tfal li baqgħu ħajjin wara attentat ta’ abort ... it-taqlib
psikoloġiku u emozzjonali li jkunu qed jesperjenzaw fil-ħajja tagħhom huwa ta’ qsim il-qalb. Qrajt u qsamt hafna stejjer kliniċi ta' psikoterapewti u
ta' counsellors li esperjenzaw sitwazzjonijiet simili. Ir-riċerka fil-qasam qed tindika b'mod ċar li t-tarbija fil-ġuf hija sensittiva, tħoss, hija konxja u
tista’ tiftakar. Psikologi prenatali huma konvinti li l-qofol tal-personalità tal-bniedem tifforma fil-ġuf. Studji juru li din il-formazzjoni tal-personalità
isseħħ permezz ta' komunikazzjoni intensiva bejn il-ġenituri - speċjalment l-omm - u t-tarbija fil-ġuf. Hija l-kombinazzjoni ta' dawn ir-realtajiet li wassluni biex nagħżel li nitkellem dwar dan is-suġġett. Nemmen bis-sħiħ li nistgħu niżguraw li t-tfal
jikbru f’ambjent kemm jista’ jkun pożittiv, mill-mument tal-konċepiment. Il-ġuf huwa d-dinja ewlenija tat-tfal – u dawn it-tfal jistgħu jesperjenzaw
din id-dinja bħala faċli jew bħala ostili. Huwa inkontestabbli li l-kwalità tal-ambjent u l-kwalita’ tal-ħajja fil-ġuf, hija determinata prinċipalment millġenituri.peer-reviewe
L-ilma li nixorbu
Get PDFDan l-artiklu hu dwar l-ilma li nixorbu u minn fejn inġibuh f’pajjiżna.peer-reviewe
Letter from Stephen T. Mather, U.S. National Park Service to Jesse L. Boyce
No full textLetter from the Director of the National Park Service, Stephen T. Mather, to Jesse L. Boyce informing him that immediate action is being taken to remove the TNT from the Grand Canyon
REPORT ON THE GENUS TRITONOTURRIS (GASTROPODA: CONOIDEA) FROM THE SOUTH CHINA SEA
No full textThree species of the genus Tritonoturris Dall 1924, s. l. (Conidae, subfamily Raphitominae) are reported from the South China Sea. These are Tritonoturris scalaris (Hinds 1843), new synonym Tritonoturris concinnus B. Li & X. Li; T. oxyclathrus (Martens 1880) (the first record since its description); T. macandrewi (E. A. Smith 1882). The holotype of Defrancia secta Sowerby 1870, is figured here for the first time. Pleurotoma oxyclathrus, Defrancia secta and Clavatula scalaris are referred to Tritonoturris for the first time
Populationsgenetische Differenzierung beim Eichenwickler (Tortrix viridana L.) und seiner Wirtspflanze (Quercus robur L.) anhand nukleärer Genmarker
No full textIn Western Europe pedunculate oak (Quercus robur L.) is the forest tree with the highest number of phytophagous insect species (Yela & Lawton 1997). One of these, the green oak leaf roller Tortrix viridana L. is an oligophagous herbivorous moth with a host range limited to the genus Quercus (Hunter 1990, Du Merle 1999). During outbreaks, T. viridana often leads to defoliation of oaks in spring. The abundance of T. viridana is subject to the population size fluctuations typical for herbivorous insects, where periods of small population sizes (latent periods) alternate with periods of high population sizes (outbreak) (e.g. Schütte 1957, Horstmann 1984). Apart from many experimental studies on population dynamics of the moth (e.g. Hunter 1990, Du Merle 1999, Ivashov & al. 2002) so far little attention has been paid to the genetic variation within the species as an important aspect of the genetics of this host-parasite interaction. Simchuk & al. (1999) found changes in the heterozygosity level of different isozyme loci during outbreaks in T. viridana and molecular markers for T. viridana have been developed for analyses of genetic variation within and among populations (Schroeder & Scholz 2005). But, investigations of genetic variation within and among populations of forest pest species are important to predict future pest outbreaks. So far the processes outbreaks based on are not entirely clarified, however it is known that migration plays a major role. Using molecular markers investigations of the genetic variation are possible and offer the opportunity to analyse distribution events. In this paper first results are presented concerning the genetic variation of the green oak leaf roller at three geographic scales: (1) among trees within a population, (2) among populations at a small spatial scale of about 150 km and (3) among populations at a broader geographic scale up to 3000 km. Furthermore results of the genetic variation of oaks at the small spatial scale are represented.Populationen des grünen Eichenwicklers (Tortrix viridana L., Lepidoptera: Tortricidae) und der Stieleiche (Quercus robur L., Fagaceae) wurden auf genetische Differenzierungen mit Hilfe von Kern-DNA-Markern untersucht. Insgesamt wurden 14 Eichenbestände in Nordrhein-Westfalen (NRW) und 7 weitere in verschiedenen Regionen Europas in die Untersuchung einbezogen. Weder für die Eiche noch für den Eichenwickler sind genetische Differenzierungen der Populationen auf einer kleinen geographischen Skala (etwa 150 km) nachweisbar, jedoch zeigen die Eichenpopulationen eine zunehmende genetische Distanz mit zunehmender geographischer Distanz. Für den Eichenwickler konnten innerhalb von Populationen in einem Radius von etwa 40 m Familienstrukturen ermittelt werden und auf einer kontinentalen Skala lassen sich die Ergebnisse für den Eichenwickler mit einer „isolation by distance“ erklären
Aylāl Rashīd, Ṣaḥīḥ al-Bukhārī : nihāyat usṭūra Rabat, Dār al-waṭan li-l-ṣaḥāfa wa-l-ṭibā‘a wa-l-nashr, 2017
No full textSangaré Youssouf T. Aylāl Rashīd, Ṣaḥīḥ al-Bukhārī : nihāyat usṭūra Rabat, Dār al-waṭan li-l-ṣaḥāfa wa-l-ṭibā‘a wa-l-nashr, 2017. In: Bulletin critique des annales islamologiques, n°33, 2019. pp. 15-18
DNA fusion gene vaccination mobilizes effective anti-leukemic cytotoxic T lymphocytes from a tolerized repertoire
No full textThe majority of known human tumor-associated antigens derive from non-mutated self proteins. T cell tolerance, essential to prevent autoimmunity, must therefore be cautiously circumvented to generate cytotoxic T cell responses against these targets. Our strategy uses DNA fusion vaccines to activate high levels of peptide-specific CTL. Key foreign sequences from tetanus toxin activate tolerance-breaking CD4+ T cell help. Candidate MHC class Ibinding tumor peptide sequences are fused to the C terminus for optimal processing and presentation. To model performance against a leukemia-associated antigen in a tolerized setting, we constructed a fusion vaccine encoding an immunodominant CTL epitopederived from Friend murine leukemia virus gag protein (FMuLVgag) and vaccinated tolerant FMuLVgag-transgenic (gag-Tg) mice. Vaccination with the construct induced epitopespecificIFN-c-producing CD8+ T cells in normal and gag-Tg mice. The frequency and avidity of activated cells were reduced in gag-Tg mice, and no autoimmune injury resulted. However, these CD8+ T cells did exhibit gag-specific cytotoxicity in vitro and in vivo. Also, epitope-specific CTL killed FBL-3 leukemia cells expressing endogenous FMuLVgag antigen and protected against leukemia challenge in vivo. These results demonstrate a simple strategy to engage anti-microbial T cell help to activate epitope-specific polyclonal CD8+ T cell responses from a residual tolerized repertoire
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