美国大豆工业海洋网箱水产养殖技术近海海水鱼类养殖网箱工程技术手册（二十）     

Mich＆el  C.  Cremer  H.  R.  Schmittou Hsiang  Pin Lan  Jesse Chappell 《中国水产》2011,(4):85-86

（3）带有水流负载网箱的模拟 表10中所示为八种水流状态下锚链和拉紧绳的平均张力。而表11中所列是网箱的相关深度响应。正如预期的那样,锚链和拉紧绳的张力随水流的速度增加而加大。  相似文献   

美国大豆工业海洋网箱水产养殖技术近海海水鱼类养殖网箱工程技术手册（二十六）     

Michael C.Cremer  H.R.Schmittou  Hsiang Pin Lan  Jesse Chappell 《中国水产》2011,(10):81-82

ⅤⅢ物理模型 1．综述 2007年,美国大豆工业协会与New Hampshire（UNH）,大学机械工程部和海洋工程中心签订了合同要求建立一个OCAT海洋网箱系统的比例模型并用此模型对OCAT网箱在不同的海洋波浪中和海流级别中的状态进行分析研究。此海洋网箱养殖系统（OCAT）的比例模型在UNH大学的波浪／牵引槽内进行了建造和试验。  相似文献   

美国大豆工业海洋网箱水产养殖技术近海海水鱼类养殖网箱工程技术手册（二）     

H.R.Schmittou  Hsiang Pin Lan  Jesse Chappell 《中国水产》2009,(10):88-89

1．网箱框架 （1）高密度聚乙烯挤压管海洋网箱水产养殖技术网箱的结构框架是由管壁较厚的高密度聚乙烯挤压管制成的,框架上部和下部的水平管件为管壁厚度25．4mm,直径280mm O．D．SDR—Ⅱ的高密度聚乙烯挤压管（见图2）。框架的对角管件为管壁厚度18．2mm,直径200mm的0．D．SDR—Ⅱ高密度聚乙烯挤压管。水平方向的管件以90。连接,对角方向的管件以垂直面的52°相连接。  相似文献   

美国大豆工业海洋网箱水产养殖技术 近海海水鱼类养殖网箱工程技术手册（十三）     

Michael C. Cremer  H.  R.  Schmittou Hsiang  Pin Lan  Jesse Chappell 《中国水产》2010,(9):83-84

（上接2010年第8期） （4）系网箱的绳索 海洋网箱水产养殖技术网箱用系网箱的绳索从海洋网箱水产养殖技术网箱上部和下部框架拐角部件连接到单点系泊系统的系泊连接件上,系泊绳索分别捆绑于海洋网箱水产养殖技术网箱框架的上、下拐角部件。绳索的每一端编成一带孔的眼环。  相似文献   

Laboratory and on‐farm evaluation of low‐cost salt mixtures for use during salinity acclimation and the nursery phase of Pacific white shrimp (Litopenaeus vannamei)     

Harsha Galkanda‐Arachchige  Luke A. Roy  Sunni Dahl  Jesse James  Anita M. Kelly  Donald Allen Davis 《Aquaculture Research》2020,51(8):3460-3471

The current study evaluates the efficacy of a low‐cost salt mixture (LCSM) to replace expensive reconstituted sea salt (RSS) in the salinity acclimation and nursery phase of Pacific white shrimp under laboratory and farm conditions. LCSM was formulated to yield sodium, potassium, calcium and magnesium concentrations closely comparable to that of diluted seawater. Laboratory‐based nursery trials were conducted at 2, 6 and 15 g/L salinities, incrementally replacing RSS with LCSM (25%, 50%, 75% and 100%) at four replicates per treatment. Thirty postlarvae were reared for 7 days in 24‐L aquaria during the 2 and 6 g/L trials, while the nursery trial for 15 g/L salinity was conducted for 21 days with 400 postlarvae stocked in 150‐L tanks. On‐farm evaluation of LCSM was carried out in two tank‐based systems installed on levees adjacent to shrimp production ponds. RSS was incrementally replaced with LCSM (0%, 50%, 75% and 100%) and 100 postlarvae stocked into each 800‐L tank. Salinity acclimation was done from 30 g/L to 6 or 1.5 g/L within 2–3 days by pumping water from adjacent shrimp production ponds. Following salinity acclimation, the S4 system maintained flow‐through at 1.5 g/L, while N10 system was maintained static at 6 g/L salinity. At the conclusion, no significant differences were observed for either survival or growth of shrimp postlarvae between RSS and LCSM treatments at all salinities examined. Results reflect the potential use of LCSM to replace RSS, which could be an excellent solution to bring down the cost of production in inland shrimp aquaculture.  相似文献   

Evaluation of pacing site in dogs with naturally occurring complete heart block     

Amara H. Estrada  Herbert W. Maisenbacher III  VMD  Robert Prošek  DVM  MS  Jesse Schold  PhD  Melanie Powell  BS  James M. VanGilder  BS 《Journal of Veterinary Cardiology》2009,11(2):79-88

Objective

To compare left ventricular synchronization and systolic performance with transvenous pacing of the right ventricular apex (RVA), left ventricular free wall (LVF) or simultaneous pacing of the RVA and LVF (BiV).

Animals, materials and methods

Seven canine patients with complete heart block. Prospective study evaluating effect of pacing site. Twenty four hours following implantation of transvenous BiV pacing systems, electrocardiograms and echocardiograms were assessed during pacing from the: (1) Right Atrial Appendage/RVA (RAA/RVA), (2) RAA/LVF, and (3) RAA/BiV.

Results

QRS duration was significantly shorter with BiV pacing versus LVF pacing (p < 0.001), or RVA pacing (p < 0.001). Echocardiographic indices of systolic performance fractional shortening (FS), ejection fraction (EF), cardiac output (CO) were significantly higher with BiV pacing than with pacing from the RVA (P = 0.023, 0.006, and 0.002 respectively). Cardiac output, measured by the biplane Simpson's method, was higher with LVF versus RVA pacing (P = 0.036). There was no difference in FS or EF when comparing LVF to RVA pacing. Tissue Doppler measurements of synchronization and systolic performance did not show any difference between pacing mode, but a significantly increased number of segments were seen to contract following aortic valve closure during LVF pacing (P = 0.0268) and RVA pacing (P = 0.0197) as compared to BiV pacing.

Conclusions

Findings suggest that BiV pacing improves cardiac output and systolic performance versus RVA pacing. This improvement however, is not reflected in tissue Doppler indices of synchronization and systolic performance.  相似文献   

Nutritional and Chemical Composition of By-Product Fractions Produced from Wet Reduction of Individual Red Salmon (Oncorhynchus nerka) Heads and Viscera     

Ted H. Wu  Jonathan D. Nigg  Jesse J. Stine  Peter J. Bechtel 《Journal Of Aquatic Food Product Technology》2013,22(2):183-195

There is growing interest for fishmeals and oils made from utilizing different fish by-products (heads, viscera, frames, etc.) that come directly from the commercial processing line. The major components of fish processing waste from salmon filleting operations are heads and viscera. In order to maximize the utilization of these individual by-products, the different fractions were evaluated. Analysis of essential amino acids in fishmeal showed significant differences in all essential amino acids except lysine. Differences were also noted in the levels of minerals, fatty acid methyl esters, biogenic amines, and fat soluble vitamins. The largest difference observed was in the level of retinol in the oil extracted from heads (8.9 ± 1.0 μg/g oil) and viscera (26.9 ± 3.8 μg/g oil). Head processing resulted in more lipids and cake, while the majority of viscera became stickwater. Results suggest that the fishmeal produced from different by-product parts can result in different nutritional values for feed or food ingredients.  相似文献   

Sapling biomass allometry and carbon content in five afforestation species on marginal farmland in semi-arid Benin     

Florent Noulèkoun  Jesse B. Naab  John P. A. Lamers  Sophia Baumert  Asia Khamzina 《New Forests》2018,49(3):363-382

Allometric equations are routinely used in the estimation of biomass stocks for carbon accounting within forest ecosystems. However, generic equations may not reflect the growth trajectories of afforestation species that are introduced to degraded farmland characterized by water and nutrient limitations. Using sequential measurements of the height, basal diameter, and above- and belowground biomass of juvenile trees, we developed allometric equations for five woody species (Moringa oleifera Lam., Leucaena leucocephala Lam., Jatropha curcas L., Anacardium occidentale L. and Parkia biglobosa Jacq.) subjected to a gradient of water and nutrient availability in an afforestation trial on degraded cropland in the semi-arid zone of Benin, West Africa. For three of the species studied, the allometric relationships between basal diameter and biomass components (i.e. leaves, stems and roots) were described best by a simple power-law model (R² > 0.93). The incorporation of species-specific height–diameter relationships and total height as additional predictors in the power-law function also produced reasonable estimates of biomass. Fifteen months after planting, roots accounted for 10–58% of the total biomass while the root-to-shoot ratio ranged between 0.16 and 0.73. The total biomass of the saplings ranged between 1.4 and 10.3 Mg ha^?1, yielding 0.6–4.3 Mg C ha^?1, far exceeding the biomass in the traditional fallow system. The rate of stem carbon sequestration measured ca. 0.62 Mg C ha^?1 year^?1. Overall, the allometric equations developed in this study are generally useful for assessing the standing shoot and root biomass of the five afforestation species during the juvenile growth stage and can help in reporting and verifying carbon stocks in young forests.  相似文献   

Distribution of Megastigmus aculeatus (Hymenoptera: Torymidae) and the levels of seed predation of Rosa multiflora (Rosaceae)     

Laura Jesse  Michael Collyer  Kirk Moloney  John J. Obrycki 《Weed Biology and Management》2013,13(3):79-88

Rosa multiflora Thunb. (Rosaceae), an invasive plant that currently infests millions of hectares in the eastern half of the USA, was planted initially in the 1940s as a “living fence”, cover for game animals and for erosion control. The larvae of Megastigmus aculeatus var. nigroflavus Hoffmeyer (Hymenoptera: Torymidae) feed on the developing R. multiflora seeds and have the potential to reduce the seed output of R. multiflora. Rosehips were collected from 49 sites across eastern and southern Iowa, USA, to determine the presence and distribution of M. aculeatus, the larvae of which were found in 266 of the 979 (27%) rosehips that were dissected and at 31 of the 49 sites (63%) that were sampled. The levels of M. aculeatus infestation over 2–3 years were determined at three selected sites and it was documented that more seeds were aborted than were viable or contained wasp larvae. A negative relationship was observed between the numbers of both the aborted and the viable seeds and the probability of a rosehip being attacked by M. aculeatus, indicating that M. aculeatus females are not preferentially selecting rosehips with higher numbers of viable or aborted seeds for oviposition. There is a significant reduction in both the viable seeds and the aborted seeds in hips that have been attacked by M. aculeatus. Detailed knowledge of R. multiflora demography is necessary to determine the level of seed predation that is required to reduce the recruitment of new individuals into the population.  相似文献   

Perceived and objective measures of the food store environment and the association with weight and diet among low-income women in North Carolina     

Gustafson AA  Sharkey J  Samuel-Hodge CD  Jones-Smith J  Folds MC  Cai J  Ammerman AS 《Public health nutrition》2011,14(6):1032-1038

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