334 research outputs found
INCREASING THE PRODUCTIVITY OF ZOOPLANKTON COMMUNITIES WITH THE USE OF EKOVITAL AND VETCH-OAT GRASS
No full textPurpose. To investigate the potential of zooplankton productivity in aquatic ecosystems under experimental conditions of the microcosms with the use of the green fertilizer (vetch-oat grass) and Ekovital.
Methodology. The study was conducted under the conditions of model ecosystems (microcosms) installed in fish-breeding ponds. We used a complex of intensification measures (enhancement, inoculation of vetch-oat seed mixture (1:1) with Ekovital at quantities of 1.4; 2.9; 4.3 ml/kg (variants D1, D2, D3), followed by sowing the pond beds with the vetch-oat mixture (1:1), growing of vetch-oat grass for the green fertilizer). The seeds were sown at a ratio of 70 kg of grains for 1 ha of ponds area. The first control variant (K1) — without green fertilizer and without preparation. The second control version (K2) vetch-oat seeds were soaked in the corresponding quantity of water without preparation and after they were sown on the pond bed. The preparation Ekovital contains specific nitrogen-fixing nodule Rhizobium leguminosarum and phosphorus mobilizing Bacillus megaterium-6 bacteria. Hydrochemical, hydrobiological, fisheries, and statistical studies were conducted according to standard methods.
Findings. It was found that the application of Ekovital in a combination with enhancement activities gives an opportunity to obtain a green fertilizer of up to 1.03 ± 0.08 t/ha during 40 days for increasing pond ecosystem productivity.
The stimulation of zooplankton development gave an opportunity to obtain the maximum biomass of 9.85–31.78 g/m3 that was 4–16 times higher than in that in the control — 2.54–3.30 g/m3. The mean values of zooplankton biomass in the experiments were 4.30–9.17 g/m3, that was 3-9 times higher than those in the control — 1.06–1.40 g/m3. The experimental variants showed a tendency for increasing the share of cladoceran crustaceans.
The production of zooplankton organisms was increased to 1834.8 kg/ha — the level of the most productive breeding ponds of the forest-steppe zone of Ukraine.
The potential of natural fish productivity of an aquatic ecosystem based on zooplankton when applying the green fertilizer (vetch-oat grass) and Ekovital showed a 3–7 time increase compared to the control. The maximum potential natural fish productivity based on zooplankton was achieved at the level of 152.90 ± 85.25 kg/ha in the variant D2.
Originality. For the first time we presented the results of the studies of zooplankton community productivity in fish-breeding ponds with the use of the green fertilizer of vetch-oat grass and bacterial preparation Ekovital under the conditions of model ponds ecosystems (microcosms).
Practical value. The received results are the basis for further studies on the use of a method for increasing natural fish productivity in fish-breeding ponds with the use of a green fertilizer such as vetch-oat grass and Ekovital
1948 Markota BJC - Page 30
No full textPhotographs of BJC sophomoresROBERT W~ TSON
Bismarck
Pre-~ Jed
RODNEY PETERSON
Bismarck
General
MARIAN McCANN
Buffalo, N. D.
Pre- Med
WARR~ N O. ASPLUND
Bismarck
Engineering
3
Low-threshold and high efficiency lasing upon band-edge excitation in a cholesteric liquid crystal
No full textThis article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Yuko Matsuhisa, Yuhua Huang, Ying Zhou, and Shin-Tson Wu, Ryotaro Ozaki, Yuuki Takao, Akihiko Fujii, and Masanori Ozaki, Appl. Phys. Lett. 90, 091114 (2007) and may be found at https://doi.org/10.1063/1.2710777.A low threshold and high efficiency laser based on dye-doped cholesteric liquid crystals (CLCs) is demonstrated using an input excitation with the same handedness of circular polarization as the helical structure of the sample at the shorter wavelength band edge of the reflection band. The responsible mechanism originates from the dramatic increase of the optical density of state (DOS) at the band edges. The calculated DOS of the CLC system confirms the authors’ experimental results
Software/Hardware defIned NEtwork (SHINE): A Novel Adaptive Optical Network Framework for Future Internet
No full textA novel Software/Hardware defIned NEtwork(SHINE) framework for future optical network is proposed inthis paper. An FPGA based SHINE adaptive network element(SANE) carrying time shared optical network (TSON) serviceand 10G Ethernet service is implemented. A cross-platformC++/Qt based SHINE IDE incorporating fine/coarse granularinstruction set is developed to simply compose node/networkmanually or automatically. Five types of SHINE working flows,i.e. node on demand, network on demand, node self-adaptation,node generation, and network generation, are depicted, thendemonstrated and selectively evaluated. Particularly, a hitlessswitch-over between sub-wavelength service (TSON) and lowlatency fat pipe service (10G Ethernet) (network on demand),and a receiver automatically detects transmitter’s change (i.e.switch-over from TSON to Ethernet), then adjusts itself (nodeself-adaption), are highlighted
: n‐FFS vs. p‐FFS: Who wins?
No full textBoth negative and positive dielectric anisotropy liquid crystals have been used in fringe field switching (FFS) display devices. We compare the electro-optic performances of single-domain p-FFS with two-domain n-FFS from device and material viewpoints. Quantum-dot backlight enhanced FFS shows vivid colors with negligible color shift, higher transmittance, and better sunlight readability
Micro-stabilised sightline for missile applications
No full textThe feasibility of un-cooled long wave infrared (LWIR) imager line of sight (LOS) stabilization without the use of gimbals has been assessed with the aim of improving the existing performance of electro-optics (EO) sensors. In order to accomplish this, an initial review of current state of the art electro-optical systems is made in order to assess their potential for this application. Following this review the most promising candidate technologies are down selected and several options are chosen for further study and analysis
Research of acute influence of new fertlizer «Rost-concentrate» on the hydrobionts Сyprinus carpio L. and Daphnia magna Straus
No full textPurpose. To establish and assess acute toxicity parameters of "ROST-concentrate (10+7+7)" acute toxicity for planktonic crustacean Daphnia magna Straus and carp fingerlings Cyprinus carpio L.
Methodology."ROST-concentrate (10+7+7)" contains macronutrients (nitrogen, phosphorus, potassium), which are valuable for the pond ecosystem, and trace elements in environmentally safe chelate form.
We determined the vital (LC0), absolutely lethal (LC100) and median (LC50) drug concentrations on the test organisms such as crustacean D. magna (Cladocera) and carp fingerlings C. carpio. The determination of acute lethal toxicity on D. magna was conducted according to DSTU 4173: 2003 that corresponded to the international standard ISO 6341: 2012, MOD [7]. The temperature of the experiment was 20±0.5 oC. The exposure time - 96 hours. Daphnia were not fed. Following "ROST-concentrate (10+7+7)" concentrations were tested: 100; 75; 50; 25; 10; 1; 0.5; 0.1; 0.05; 0.01; 0,005; 0,001 ml/dm3.
We also determined the acute lethal toxicity on carp fingerings with an average weight of 6.78±0.63 grams following the standardized procedure [8]. Pond water was used in the experiment. Ten fish were placed into a 40 L aquarium. Following concentrations of "ROST-concentrate (10+7+7)" were investigated: 0,5; 1; 2; 3; 4; 5; 6; 7; 8; 9; 10; 15; 20; 30; 40 mg/L. The exposure time was 24 hours. Water temperature was 19±1oC. LC50 drug median concentration was calculated according to G. Kerber method.
Findings. The parameters of integral acute toxicity of "ROST-concentrate (10+7+7)" on typical organisms of fish pond ecosystems.With 96 h exposure on juvenile cladoceran D. magna, lethal concentration was LC100 = 5,00 ml/dm3, median concentration was LC50 = 0,15 ml/dm3, vital concentration was LC0 = 0,01 ml/dm3. According to the classification of toxic substances, the "ROST-concentrate (10+7+7)" is characterized by low toxicity on juvenile cladoceran D. magna. With 24 h exposure on carp fingerling: lethal concentration was LC100 = 40,0 ml/dm3, median concentration was LC50 = 18,6 ml/dm3, vital concentration was LC0 = 7,0 ml/dm3. According to the classification of toxic substances [11], "ROST-concentrate (10+7+7)" was practically nontoxic to 6.78 ± 0.63 g carp juveniles.
Originality. First study of the acute effect of organic-mineral preparation "ROST-concentrate (10+7+7)" on planktonic cladoceran D. magna and carp juvenile C. carpio.
Practical value. The obtained results show a very low level of toxicity of the drug and safety for organisms of fish-breeding pond ecosystem organisms after its application
INCREASING FISH PRODUCTIVITY OF POND ECOSYSTEMS BY FERTILIZING THEM WITH DISTILLER'S GRAINS
No full textPurpose. To study fish culture parameters of young-of-the-year carp in the conditions of industrial fish-growing ponds when applying experimental repeated fertilization with distiller’s grain.
Methodology. The study was conducted in industrial fish-growing ponds. The wastes of alcohol industry – the distiller’s grain as organic fertilizer was gradually introduced into ponds at following amounts: first application – 1,0 t/ha, second application in 10 days – 0,5 t/ha, third application in 12 days – 0,5 t/ha. The control ponds were fertilized with humus (2 t/ha). Young-of-the-year carp (Cyprinus carpio) were grown in monoculture at stocking density of 30 000 fish/ha. In addition, 100 kg/ha of lime were applied during the culture season in the experiment and control. Fertilization with humus and application of lime in ponds, hydrochemical studies, sampling and processing of hydrobiological samples, fish culturing and statistical studies were carried out according to standard methods.
Findings. Gradual fertilizing with distiller’s grain (to the total 2 t/ha) gave the possibility to create favorable hydrochemical and hydrobiological regimes. An average daily growth in the experimental fish groups of 0,44 ± 0,09 g/day that was similar to in the control (0,45 ± 0,11 g/day) with positive significant correlation between them (r = 0,97; p <0,001) was achieved. The performed measures gave a possibility to obtain fish productivity in the experimental variant 10.7% more than in the control. An economic effect of 14.3% cost reduction for fertilizing ponds was achieved.
Originality. For the first time we presented the results of fish culture and biological parameters of young-of-the-year carp in industrial ponds when applying 3-time fertilization with distiller’s grain.
Practical Value. The obtained results are the basis for the broad use of non-traditional organic fertilizer – distiller’s grain in industrial ponds, when growing young-of-the-year carp in monoculture
Analysis of the factors affecting the oxygenator performance time in venoarterial ECMO applied to postcardiotomic shock
No full textÇalışmanın amacı ortalama kullanma süresi olan Ekstrakorporeal Membran Oksijenasyonu (ECMO)'nun verimliliğine etki eden faktörlerin analizini yapmaktır. Elde edilen sonuçlara göre oksijenatör verimliliğinin azaldığı koşulları tespit edip erken dönemde bu sorunların önüne geçerek verimliliği korumak ve risk faktörlerini ortaya çıkarmak amaçlanmaktadır. Çalışmaya Sağlık Bilimleri Üniversitesi Dr. Siyami Ersek Göğüs Kalp ve Damar Cerrahisi Eğitim ve Araştırma Hastanesinde açık kalp cerrahisi sonrasında kalp-akciğer makinesinden ayrılamayan veya postoperatif dönemde tedaviye geleneksel yöntemlerle cevap alınamayıp ECMO takılan 21 hasta dahil edildi. Bu hastalara ait yaş, cinsiyet, BSA, hipertansiyon veya Diabetes Mellitus (DM) varlığı, geçirdiği operasyonun adı, kardiyopulmoner bypass (KPB) süresi, kross klemp süresi, kanül çapı, kanülasyon yeri ve preoperatif değerler (HDL, LDL ve PLT) kaydedildi. Postoperatif dönemde ECMO'da geçirdiği süre boyunca oksijenatörden günlük olarak giriş kan gazı ve çıkış kan gazı alındı. Bu kan gazındaki parsiyel oksijen (pO2) değerleri kaydedildi. ECMO RPM, LPM ve oksijenatör giriş ve çıkışındaki basınç ölçümleri izlendi. ACT takibi yapıldı. Oksijenatörde sıcaklık ölçümleri yapıldı. ECMO devreleri makroskobik trombüs oluşumu yönünden izlendi. Toplanan parametreler ile beraber hastalardaki hemorajik değerler (Ph, laktat, Htc, PLT, RDW, MPV, PDW, MCHC ve MCH ) 3 ayrı zaman diliminde istatistiksel olarak analizi yapıldı.Sonuçlara göre oksijenatör çıkış pO2'inin son günü ile 5.günü arasındaki p değeri p=0,001 olduğundan istatistiksel olarak anlamlı sonuç elde edildi. T1(2.gün) T2(5.gün) ve Tson(Son gün) olmak üzere İncelenen n=21 hastada T1'de gözle görülür trombüs varlığına rastlanmadı. T2'de n=1 hastada trombüs görülürken, Tson da n=5 hastada da varlığı saptandı. T1 ve Tson değerleri arasında p=0,019 olduğundan istatistiksel olarak anlamlı bulundu.The aim of the study is to analyze the factors affecting the efficiency of Extracorporeal Membrane Oxygenation (ECMO), which is the average duration of use. According to the results obtained, it is aimed to detect the conditions where the efficiency of the oxygenator decreases and to prevent these problems in the early period, to protect the efficiency and to reveal the risk factors. The study was supported by the University of Health Sciences Dr. Siyami Ersek Thoracic and Cardiovascular Surgery Training and Research Hospital 21 patients who could not be separated from the heart-lung machine after open heart surgery or who did not respond to the treatment with conventional methods in the postoperative period and had ECMO were included. Age, gender, BSA, presence of hypertension or Diabetes Mellitus (DM), the name of the operation, cardiopulmonary bypass (CPB) duration, cross-clamp time, cannula diameter, cannulation site and preoperative values (HDL, LDL and PLT) of these patients were recorded. In the postoperative period, inlet blood gas and exit blood gas were taken daily from the oxygenator during the time he spent in ECMO. Partial oxygen (pO2) values in this blood gas were recorded. Pressure measurements at ECMO RPM, LPM and oxygenator inlet and outlet were monitored. ACT was followed. Temperature measurements were made in the oxygenator. ECMO circuits were monitored for macroscopic thrombus formation. The hemorrhagic values (Ph, lactate, Htc, PLT, RDW, MPV, PDW, MCHC and MCH) in the patients were statistically analyzed in 3 different time periods, together with the collected parameters. According to the results, a statistically significant result was obtained as the p value between the last day and the 5th day of the oxygenator outlet pO2 was p=0.001. T1(Second day), T2(5th day) and Tson(Last day) In n=21 patients examined, no visible thrombus was found in T1. While thrombus was seen in n=1 patients in T2, its presence was detected in n=5 patients in Tson. Since p=0.019 between T1 and Tson values, it was found to be statistically significant
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