A DEVICE FOR MEASURING SURFACE TENSION AUTOMATICALLY     

Noüy LD 《Science (New York, N.Y.)》1929,69(1783):251-252

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Performance Evaluating Index and Method on Inventory Management of Supply Chain     

SUN Shi y  LUO Bing  YU Hui qiang 《保鲜与加工》2002,(10):101-104

The inventory management in supply chain is one of the most important aspect of supply chain management. As the organization and the management mode of the enterprise in supply chain has changed, the inventory management in supply chain is different from the traditional inventory management for single enterprise. The effective inventory management in supply chain can improve the agility and more quickly response to the market. Considering the present problems in the inventory management in supply chain, it is presented that the performance evaluating principle and the evaluating index. This paper makes certain the rate of the evaluating index with AHP method. It is evaluated the performance of inventory management of supply chain through the illegibility synthesis judge method, and it is applied to an example.  相似文献   

Liming of acidified lakes and rivers in Norway     

Steinar Sandøy  Ann Jori Romundstad 《Water, air, and soil pollution》1995,85(2):997-1002

Acidification is one of the most serious environmental problems in Norway. International agreements to reduce emissions are the only acceptable solution to the acidification problem. The “Sulphur Protocol”, signed in Oslo in 1994, will certainly improve matters, but southern Norway will have large acidified areas for decades. Norwegian environmental authorities therefore carry out liming as a temporary alleviatory measure to reduce damage for freshwater ecosystems. In 1995, about NOK 92 mill, was spent on liming. Acidification has wiped out the salmon in 25 rivers, and they are threatened in another 28 rivers. Because of varying water flow and rapidly changing water quality, liming a Norwegian salmon river is a huge operation demanding sophisticated equipment. Eleven rivers carrying anadromous fish are being limed in 1995. The largest is the River Audna where liming has meant that a salmon stock could be reintroduced. Most rivers are limed using automatic lime dosers. The most sophisticated ones control the amount of lime using pH sensors and water flow to neutralize major episodes of acidic water flow, which regularly occur in Norwegian rivers.  相似文献   

Food variety, socioeconomic status and nutritional status in urban and rural areas in Koutiala (Mali)     

Hatløy A  Hallund J  Diarra MM  Oshaug A 《Public health nutrition》2000,3(1):57-65

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The evaluation of selected parameters of cellular nonspecific immunity in normal and allergic horses     

Wilkołek P  Szczepanik M  Gołyński M  Adamek L  Pomorska A  Maj-Martyniuk M  Sitkowski W 《Polish journal of veterinary sciences》2011,14(2):287-288

The main aim of this study was to compare selected nonspecific immunity parameters in 14 allergic and 12 healthy horses. Each animal was assessed according to the following parameters: in vitro functional capacity of phagocytic cells using the nitro blue tetrazolium chloride reduction test, both spontaneous (NBT) and zymozan stimulated (NBTs), and ingestion capacity of phagocytic cells using a phagocytic index test (IF) and percentage of phagocytosing neutrophils activity (%KF). Differences were demonstrated between the group of allergic horses, especially with severe allergy symptoms, and healthy horses in NBTs values, with higher values in healthy horses. The values of the phagocytic index were significantly higher in horses with allergy.  相似文献   

THE RING METHOD IN CHANGING SURFACE TENSION     

Noüy LD 《Science (New York, N.Y.)》1928,67(1746):607-608

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Discovery of young, isolated planetary mass objects in the final sigma Orionis star cluster     

Zapatero Osorio MR  Béjar VJ  Martín EL  Rebolo R  Barrado y Navascués D  Bailer-Jones CA  Mundt R 《Science (New York, N.Y.)》2000,290(5489):103-107

We present the discovery by optical and near-infrared imaging of an extremely red, low-luminosity population of isolated objects in the young, nearby stellar cluster around the multiple, massive star final sigma Orionis. The proximity (352 parsecs), youth (1 million to 5 million years), and low internal extinction make this cluster an ideal site to explore the substellar domain from the hydrogen mass limit down to a few Jupiter masses. Optical and near-infrared low-resolution spectroscopy of three of these objects confirms the very cool spectral energy distribution (atmospheric effective temperatures of 1700 to 2200 kelvin) expected for cluster members with masses in the range 5 to 15 times that of Jupiter. Like the planets of the solar system, these objects are unable to sustain stable nuclear burning in their interiors, but in contrast they are not bound to stars. This new kind of isolated giant planet, which apparently forms on time scales of less than a few million years, offers a challenge to our understanding of the formation processes of planetary mass objects.  相似文献   

壳聚糖添加助剂涂膜对草莓采后生理的影响   总被引：1，自引：0，他引：1  

徐维娅  罗自生 《上海交通大学学报(农业科学版)》2002,20(1):42-44,48

研究了壳聚糖添加助剂涂膜对采后草莓品质和生理的影响，结果表明：0.5%壳聚糖添加助剂涂膜可明显延缓果实维生素C含量的降低，减少腐烂，抑制草莓呼吸强度、内源乙烯释放量和MDA含量，提高SOD活性。  相似文献   

Aztec arithmetic revisited: land-area algorithms and Acolhua congruence arithmetic     

Williams BJ  Jorge y Jorge Mdel C 《Science (New York, N.Y.)》2008,320(5872):72-77

Acolhua-Aztec land records depicting areas and side dimensions of agricultural fields provide insight into Aztec arithmetic. Hypothesizing that recorded areas resulted from indigenous calculation, in a study of sample quadrilateral fields we found that 60% of the area values could be reproduced exactly by computation. In remaining cases, discrepancies between computed and recorded areas were consistently small, suggesting use of an unknown indigenous arithmetic. In revisiting the research, we discovered evidence for the use of congruence principles, based on proportions between the standard linear Acolhua measure and their units of shorter length. This procedure substitutes for computation with fractions and is labeled "Acolhua congruence arithmetic." The findings also clarify variance between Acolhua and Tenochca linear units, long an issue in understanding Aztec metrology.  相似文献   

Occurrence,Degradation and Fate of Pesticides During Composting     

Fatih Büyüksönmez  Robert Rynk  Thomas F. Hess  Edward Bechinski 《Compost science & utilization》2013,21(4):66-82

This paper reviews the findings of research reported in the currently available literature regarding the occurrence and transformations of pesticides through the composting process and the use of compost. Part I summarizes the composting process, pesticides and mechanisms of pesticide degradation. Part II reviews research studies concerning the occurrence and fate of pesticides during composting. Investigations of pesticide residues in composting feedstocks and finished compost detected few of the target pesticides. The compounds that were found occurred at low concentrations. The majority of the compounds detected were insecticides in the organochlorine category, including chemicals that have been banned from use in the U.S. for many years. Generally, organophosphate and carbamate insecticides and most herbicides were rarely detected. Comparisons of pesticide concentrations before and after composting also showed organochlorine compounds to be most resistant to biodegradation during composting. With some exceptions, pesticides in other categories decomposed moderately well to very well. Studies that followed the mechanisms of degradation indicate that mineralization accounts for only a small portion of pesticide disappearance. Other prominent fates include partial degradation to secondary compounds, adsorption, humification, and volatilization. In general the research results suggest that the pattern of pesticide degradation during composting is similar to the degradation observed in soils. With a few important distinctions, composting can be considered a biologically active soil environment in which degradation is accelerated. However, as some studies noted, composting does not always speed the degradation of all pesticides. The nature of the pesticide, specific composting conditions and procedures, the microbial communities present, and the duration of composting affect the extent and the mechanisms of degradation.  相似文献