94 research outputs found

    PELACAKAN KELUARAN SISTEM LINEAR POMPA PISTON TUNGGAL DENGAN KONTROL KOMPOSISI RESERVOIR POMPA

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    Pompa piston tunggal adalah pompa yang terdiri dari sebuah piston yang digunakan untuk memompa air, sehingga terjadi perbedaan tekanan dalam sistem pompa tersebut dan dapat dikonverter menjadi energi. Pompa piston tunggal ini difokuskan sebagai pembangkit listrik energi ombak. Penelitian ini berjudul pelacakan keluaran sistem linear pompa piston tunggal dengan kontrol reservoir pompa. Tujuan dari penelitian ini adalah untuk merekonstruksi model sistem persamaan dari pompa piston tunggal dan membangun persamaan kontrol pompa piston tunggal terhadap reservoir-nya. Metode penelitian yang digunakan adalah metode numerik Runge-Kutta dan tracking kontrol sistem persamaan linear. Berdasarkan tujuan yang ingin dicapai sebelumnya, penelitian ini berfokus pada perancangan kontrol terhadap reservoir atas dari pompa piston tunggal, sehingga diharapkan bahwa dengan kondisi tertentu yang optimal dari reservoir atas dapat menghasilkan perbedaan tekanan yang lebih optimal pula pada sistem, yang diharapkan juga berpengaruh dengan banyak energi yang dihasilkan dari sistem. Hasil yang didapat dari pengontrolan sistem ini adalah nilai dari variabel kontrol (A_u), yaitu 52 m^2. Nilai tersebut merupakan nilai rata-rata A_u dengan interval nilai 47 m^2 sampai 75 m^2. Didapat pula energi hidrolik yang dihasilkan sistem ini selama 100 detik adalah 5.500.175 J

    The association between prior statin usage and long-term outcomes after critical care admission

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    Background: Statins may have immunomodulatory effects that benefit critically ill patients. Therefore we retrospectively examined the association between survival and the prescription of statins prior to admission to an intensive care unit (ICU), or high dependency unit (HDU), as a result of major elective surgery, or as an emergency with a presumed diagnosis of sepsis. Methods: We retrospectively studied critical care patients (ICU or HDU) from a tertiary referral UK teaching hospital. Nottingham University Hospitals has over 2200 beds, of which 39 are critical care beds. Over a five-year period (2000–2005) 414 patients were identified with a presumed diagnosis of sepsis, and 672 patients were identified with a planned ICU/HDU admission following elective major surgery. Patients prescribed statins prior to hospital admission were compared with those who were not. Demographics, past medical history, drug history, and Acute Physiology and Chronic Health Evaluation II (APACHE II) scores were examined. Univariate and multivariate analyses were applied using the primary endpoint of survival at five years after admission. Results: Patients prescribed statins prior to critical care admission were, on average, older, with higher initial APACHE II scores and more pre-existing comorbidities. Statins were almost invariably stopped following admission to critical care. Statin usage was not associated with significantly altered survival during hospital admission, or at five years, for either patients with sepsis (9% v 15%, P=0.121; 73% v 84%, P=0.503 respectively), or post-operative patients (55% v 58%, P=0.762; 57% v 63%, P=0.390). Conclusions: Prior statin usage was not associated with improved or worsening outcomes in patients admitted to critical care after elective surgical cases or with a presumed diagnosis of sepsis

    The European Renal Association - European Dialysis and Transplant Association (ERA-EDTA) Registry Annual Report 2016 : a summary

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    Background. This article summarizes the ERA-EDTA Registry's 2016 Annual Report, by describing the epidemiology of renal replacement therapy (RRT) for end-stage renal disease (ESRD) in 2016 within 36 countries. Methods. In 2017 and 2018, the ERA-EDTA Registry received data on patients undergoing RRT for ESRD in 2016 from 52 national or regional renal registries. In all, 32 registries provided individual patient data and 20 provided aggregated data. The incidence and prevalence of RRT and the survival probabilities of these patients were determined. Results. In 2016, the incidence of RRT for ESRD was 121 per million population (pmp), ranging from 29 pmp in Ukraine to 251 pmp in Greece. Almost two-thirds of patients were men, over half were aged >= 65 years and almost a quarter had diabetes mellitus as their primary renal diagnosis. Treatment modality at the start of RRT was haemodialysis for 84% of patients. On 31 December 2016, the prevalence of RRT was 823 pmp, ranging from 188 pmp in Ukraine to 1906 pmp in Portugal. In 2016, the transplant rate was 32 pmp, varying from 3 pmp in Ukraine to 94 pmp in the Spanish region of Catalonia. For patients commencing RRT during 2007-11, the 5-year unadjusted patient survival probability on all RRT modalities combined was 50.5%. For 2016, the incidence and prevalence of RRT were higher among men (187 and 1381 pmp) than women (101 and 827 pmp), and men had a higher rate of kidney transplantation (59 pmp) compared with women (33 pmp). For patients starting dialysis and for patients receiving a kidney transplant during 2007-11, the adjusted patient survival probabilities appeared to be higher for women than for men.Peer reviewe

    The European Renal Association - European Dialysis and Transplant Association Registry Annual Report 2014 : a summary

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    Background: This article summarizes the European Renal Association - European Dialysis and Transplant Association Registry's 2014 annual report. It describes the epidemiology of renal replacement therapy (RRT) for end-stage renal disease (ESRD) in 2014 within 35 countries. Methods: In 2016, the ERA-EDTA Registry received data on patients who in 2014 where undergoing RRT for ESRD, from 51 national or regional renal registries. Thirty-two registries provided individual patient level data and 19 provided aggregated patient level data. The incidence, prevalence and survival probabilities of these patients were determined. Results: In 2014, 70 953 individuals commenced RRT for ESRD, equating to an overall unadjusted incidence rate of 133 per million population (pmp). The incidence ranged by 10-fold; from 23 pmp in the Ukraine to 237 pmp in Portugal. Of the patients commencing RRT, almost two-thirds were men, over half were aged >= 65 years and a quarter had diabetes mellitus as their primary renal diagnosis. By day 91 of commencing RRT, 81% of patients were receiving haemodialysis. On 31 December 2014, 490 743 individuals were receiving RRT for ESRD, equating to an unadjusted prevalence of 924 pmp. This ranged throughout Europe by more than 10-fold, from 157 pmp in the Ukraine to 1794 pmp in Portugal. In 2014, 19 406 kidney transplantations were performed, equating to an overall unadjusted transplant rate of 36 pmp. Again this varied considerably throughout Europe. For patients commencing RRT during 2005-09, the 5-year-adjusted patient survival probabilities on all RRT modalities was 63.3% (95% confidence interval 63.0-63.6). The expected remaining lifetime of a 20-to 24-year-old patient with ESRD receiving dialysis or living with a kidney transplant was 21.9 and 44.0 years, respectively. This was substantially lower than the 61.8 years of expected remaining lifetime of a 20-year-old patient without ESRD.Peer reviewe

    Soil Respiration in Relation to Photosynthesis of Quercus mongolica Trees at Elevated CO2

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    Knowledge of soil respiration and photosynthesis under elevated CO2 is crucial for exactly understanding and predicting the carbon balance in forest ecosystems in a rapid CO2-enriched world. Quercus mongolica Fischer ex Ledebour seedlings were planted in open-top chambers exposed to elevated CO2 (EC = 500 µmol mol−1) and ambient CO2 (AC = 370 µmol mol−1) from 2005 to 2008. Daily, seasonal and inter-annual variations in soil respiration and photosynthetic assimilation were measured during 2007 and 2008 growing seasons. EC significantly stimulated the daytime soil respiration by 24.5% (322.4 at EC vs. 259.0 mg CO2 m−2 hr−1 at AC) in 2007 and 21.0% (281.2 at EC vs. 232.6 mg CO2 m−2 hr−1 at AC) in 2008, and increased the daytime CO2 assimilation by 28.8% (624.1 at EC vs. 484.6 mg CO2 m−2 hr−1 at AC) across the two growing seasons. The temporal variation in soil respiration was positively correlated with the aboveground photosynthesis, soil temperature, and soil water content at both EC and AC. EC did not affect the temperature sensitivity of soil respiration. The increased daytime soil respiration at EC resulted mainly from the increased aboveground photosynthesis. The present study indicates that increases in CO2 fixation of plants in a CO2-rich world will rapidly return to the atmosphere by increased soil respiration

    Пациент с вродена миопатия в резултат на мутация в CRYAB гена, водеща до развитието на алфа-в кристалинопатия

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    Миофибриларни миопатии (MFM) са група от доминантни, наследствени, дегенеративни заболявания на скелетния и сърдечния мускул, характеризиращи се с вътреклетъчно натрупване на протеин, разпадане на миофибрили, десмин-реактивна агрегация на разградени нишки в плеоморфни гранулирани или хиалинни включвания, и ектопична експресия на множество свързани с Z-диск и други протеини. Молекулярната основа на MFM е хетерогенна и са идентифицирани мутации в гени, кодиращи саркомерни Z-диск протеини, включително десмин (DES), алфа-В кристалин (CRYAB), миотилин (TTID), ZASP (LDB3), филамин С (FLNC) и Bcl-2-свързан атаноген-3 протеин (BAG3). Представяме болен на 34 години с начало на болестта от кърмаческа възраст, проявяваща се с хипомимичен фациес, носов говор, мускулна хипотония, мускулна слабост предимно за проксималните мускули на горните крайници, със засягане на сърдечна и дихателната функция
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