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Working fluid selection for organic Rankine cycle power generation using hot produced supercritical CO2 from a geothermal reservoir
Geothermal heat mining simulations using supercritical CO2 (sCO2) were performed in this research. Working fluid selection criteria for power generation using sCO2 from a geothermal reservoir are then presented for subcritical, superheated and supercritical organic Rankine cycles (ORCs). Meanwhile, method of working fluid classification for ORC is proposed. To get the most feasible ORC design, this study introduces the concept of âturning pointâ for isentropic and dry working fluids, as well as minimum turbine inlet temperature for wet working fluids. A thermodynamic model was developed with capabilities to obtain the optimal working fluid mass flow rate, evaporation temperature, superheated temperature, and supercritical pressure, to evaluate the thermal performance of the three ORC approaches using hot produced sCO2. With this model, thirty potential working fluids with critical temperatures in the range from 50 to 225 °C were screened for utilizing hot produced sCO2 considering physical properties, environmental and safety impacts, and thermodynamic performances. Finally, the thermodynamic results were compared for all possible working fluids
Physiological responses of Porphyra haitanesis to different copper and zinc concentrations
No presente estudo foram investigadas as respostas fisiolĂłgicas da alga vermelha Porphyra haitanesis Ă s elevadas concentraçÔes de cobre (acima de 50 μM) e de zinco (acima de 100 μM). Os resultados mostram que os efeitos de Cu2+ e Zn2+ sobre o crescimento, pigmentos fotossintĂ©ticos (clorofilas e carotenĂłides), ficobiliproteĂna e metabolismo (o espectro de emissĂŁo de fluorescĂȘncia e as atividades do fotossistema) nĂŁo seguem o mesmo padrĂŁo. A taxa de crescimento relativo foi inibida por diferentes concentraçÔes de Cu2+ e, em presença de Zn2+, aumentou ligeiramente em baixas concentraçÔes (abaixo de 10 μM) e foi inibida em altas concentraçÔes. Por outro lado, os teores de ficoeritrina apresentaram leve aumento em concentraçÔes relativamente baixas de Cu2+ e Zn2+ (atĂ© 1 μM Cu2+ e atĂ© 20 μM Zn2+, respectivamente) e foram inibidas por altas concentraçÔes. AlĂ©m disso, tanto a fotossĂntese quanto a respiração mostraram aumento nas trocas de oxigĂȘnio em resposta Ă s concentraçÔes relativamente baixas de Cu2+ (atĂ© 1 μM) e de Zn2+ (atĂ© 10 μM), alĂ©m da redução em concentraçÔes relativamente altas desses metais. Adicionalmente, as atividades fotoredutoras e as emissĂ”es de fluorescĂȘncia do fotossistema II (PSII) foram incrementadas em baixas concentraçÔes de Cu2+ (atĂ© 0,1 μM) e de Zn2+ (atĂ© 10 μM) e inibidas por altas concentraçÔes. Desta forma, a intensidade da fluorescĂȘncia da clorofila-a e dos centros de reação ativa PSII seguiram um padrĂŁo semelhante em resposta Ă s elevadas concentraçÔes de Cu2+ e Zn2+. Esses resultados sugerem que baixas concentraçÔes de Cu2+ e Zn2+ afetam o metabolismo de P. haitanesis, que se torna inibido por altas concentraçÔes desses metais.In the present study, several physiological responses of the red marine alga Porphyra haitanesis to elevated concentrations of copper (up to 50 μM) and zinc (up to 100 μM) were investigated. Our results showed that the effects of Cu2+ and Zn2+ on growth, photosynthetic pigments (chlorophylls and carotenoids), phycobiliprotein and metabolism (the fluorescence emission spectra and the activities of photosystemII) did not follow the same pattern. The relative growth rate was inhibited by different concentrations of Cu2+, and was slightly increased at lower concentrations (up to 10 μM) and inhibited at higher Zn2+concentrations. On the other hand, the phycoerythrin contents were slightly increased at relatively low concentrations (up to 1 μM Cu2+ or 20 μM Zn2+) and inhibited by high Cu2+ and Zn2+ concentrations. Moreover, photosynthesis and respiration showed an increase in the amount of oxygen exchange in response to relatively low Cu2+ (up to 1 μM) and Zn2+ concentrations (up to 10 μM), and a reduction to relatively high Cu2+ and Zn2+ concentrations. Oxygen evolution was more sensitive than oxygen uptake to Cu2+ and Zn2+. In addition, the photoreductive activities and fluorescence emission of photosystem II (PS II) were enhanced by lower concentrations of Cu2+ (up to 0.1 μM) and Zn2+ (up to 10 μM) and inhibited by higher concentrations. Furthermore, the intensity of chlorophyll a fluorescence and the active PSII reaction centers followed a similar pattern in response to elevated concentrations of Cu2+ and Zn2+. These results suggest that lower concentrations of Cu2+ and Zn2+ affected the metabolism of P. haitanesis, which was inhibited by higher concentrations of these metals
Effect of 15-deoxyspergualin on experimental organ transplantation
DSPG had a definite but relatively feeble immunosuppressive effect in rats undergoing heterotopic heart transplantation and in dogs after renal transplantation. The drug was toxic in both species, although less so in rats. In dogs, synergistic interactions with cyclosporine and steroids were not evident
Renal artery reconstruction for harvesting injuries in kidney transplantation with particular reference to the use of vascular allografts.
At the University of Pittsburgh during the calendar year 1986, an arterial injury occurred during harvesting in 20 (7.5%) of the 270 grafts used to perform kidney transplantation (KTx). Four cases required reconstruction, using extension iliac arterial allografts from cadaveric donors of the same blood type; 6 patients, remodelling of the aortic patch in multiple arteries; 4 cases, repairs for injuries to the smaller segmental/polar arteries; 6 cases, a combination of the above techniques. These ex vivo arterial reconstructions are described and the use of donor arterial homografts is emphasized. No deaths have occurred at an average follow-up of 19 months. The postoperative acute tubular necrosis (ATN) rate was significantly higher (90%) compared with non-reconstructed kidneys during the same year (30%). The 1-year graft survival of kidneys undergoing arterial reconstruction (75%) was statistically no different than the overall kidney-transplant survival. Whenever extension iliac allografts were utilized, the cyclosporin-steroid immunosuppression required to control the kidney rejection contributed to the long-term patency rate of the graft. Since the number of organs available for grafting is limited, reconstruction of injured renal vessels has become justified, allowing valuable kidneys to be used that would otherwise be lost
Microwave Photonic Imaging Radar with a Millimeter-level Resolution
Microwave photonic radars enable fast or even real-time high-resolution
imaging thanks to its broad bandwidth. Nevertheless, the frequency range of the
radars usually overlaps with other existed radio-frequency (RF) applications,
and only a centimeter-level imaging resolution has been reported, making them
insufficient for civilian applications. Here, we propose a microwave photonic
imaging radar with a millimeter-level resolution by introducing a
frequency-stepped chirp signal based on an optical frequency shifting loop. As
compared with the conventional linear-frequency modulated (LFM) signal, the
frequency-stepped chirp signal can bring the system excellent capability of
anti-interference. In an experiment, a frequency-stepped chirp signal with a
total bandwidth of 18.2 GHz (16.9 to 35.1 GHz) is generated. Postprocessing the
radar echo, radar imaging with a two-dimensional imaging resolution of ~8.5
mm~8.3 mm is achieved. An auto-regressive algorithm is used to
reconstruct the disturbed signal when a frequency interference exists, and the
high-resolution imaging is sustained
Deletion of BMP receptor type IB decreased bone mass in association with compromised osteoblastic differentiation of bone marrow mesenchymal progenitors
We previously found that disruption of two type I BMP receptors, Bmpr1a and Acvr1, respectively, in an osteoblast-specific manner, increased bone mass in mice. BMPR1B, another BMP type I receptor, is also capable of binding to BMP ligands and transduce BMP signaling. However, little is known about the function of BMPR1B in bone. In this study, we investigated the bone phenotype in Bmpr1b null mice and the impacts of loss of Bmpr1b on osteoblasts and osteoclasts. We found that deletion of Bmpr1b resulted in osteopenia in 8-week-old male mice, and the phenotype was transient and gender specific. The decreased bone mass was neither due to the changes in osteoblastic bone formation activity nor osteoclastic bone resorption activity in vivo. In vitro differentiation of Bmpr1b null osteoclasts was increased but resorption activity was decreased. Calvarial pre-osteoblasts from Bmpr1b mutant showed comparable differentiation capability in vitro, while they showed increased BMP-SMAD signaling in culture. Different from calvarial pre-osteoblasts, Bmpr1b mutant bone marrow mesenchymal progenitors showed compromised differentiation in vitro, which may be a reason for the osteopenic phenotype in the mutant mice. In conclusion, our results suggested that BMPR1B plays distinct roles from BMPR1A and ACVR1 in maintaining bone mass and transducing BMP signaling
Lead Exposure Is Associated with Decreased Serum Paraoxonase 1 (PON1) Activity and Genotypes
Lead exposure causes cardiac and vascular damage in experimental animals. However, there is considerable debate regarding the causal relationship between lead exposure and cardiovascular dysfunction in humans. Paraoxonase 1 (PON1), a high-density lipoprotein-associated antioxidant enzyme, is capable of hydrolyzing oxidized lipids and thus protects against atherosclerosis. Previous studies have shown that lead and several other metal ions are able to inhibit PON1 activity in vitro. To investigate whether lead exposure has influence on serum PON1 activity, we conducted a cross-sectional study of workers from a lead battery manufactory and lead recycling plant. Blood samples were analyzed for whole-blood lead levels, serum PON1 activity, and three common PON1 polymorphisms (Q192R, L55M, â108C/T). The mean blood lead level (± SD) of this cohort was 27.1 ± 15 ÎŒg/dL. Multiple linear regression analysis showed that blood lead levels were significantly associated with decreased serum PON1 activity (p < 0.001) in lead workers. This negative correlation was more evident for workers who carry the R192 allele, which has been suggested to be a risk factor for coronary heart disease. Taken together, our results suggest that the decrease in serum PON1 activity due to lead exposure may render individuals more susceptible to atherosclerosis, particularly subjects who are homozygous for the R192 allele
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