Statistical Determination of Data Requirements for Assessment of Lake Restoration Programs

1982 ◽  
Vol 39 (4) ◽  
pp. 607-610 ◽  
Author(s):  
Nancy Morton Trautmann ◽  
Charles E. McCulloch ◽  
Ray T. Oglesby
Keyword(s):  
New York ◽  
Lake Restoration ◽  
Conclusive Evidence ◽  
Productivity Change ◽  
Before And After ◽  
Statistical Determination ◽  
Using Data ◽  
The One ◽  
Data Requirements

To test the effectiveness of lake restoration programs, monitoring must be carried out both before and after any change is made. Statistical techniques are presented for calculation of these sampling requirements both for individual lakes and for groups of lakes analyzed collectively. Illustration of these techniques is made using data on productivity of New York State's Finger Lakes before and after the state ban on phosphate detergents. Existing pre-ban data on mean summer phytoplankton standing crop are shown to be insufficient for conclusive evidence of a post-ban productivity change in individual lakes no matter how many years of post-ban data could be obtained. When the lakes are analyzed as a group rather than individually, however, the conclusion is reached that there is a probability of only 0.7% that a chlorophyll drop at least as large as the one observed would have occurred without the effect of the phosphate detergent ban. Use of power calculations before sampling is begun will help to maximize the efficiency of data collection efforts in lake restoration programs.Key words: lake sampling design, statistical analysis, summer chlorophyll, data requirements, lake restoration, eutrophication

Statistical determination of geophysical well log response functions

Geophysics ◽  
1983 ◽  
Vol 48 (11) ◽  
pp. 1525-1535 ◽  
Author(s):  
Eugene A. Nosal
Keyword(s):  
Power Spectrum ◽  
Response Function ◽  
System Response ◽  
General Terms ◽  
Induction Logging ◽  
Conductivity Profile ◽  
Statistical Determination ◽  
The One

The vertical response function of induction logging tools is shown to be derivable from a power spectrum analysis of the measurement. The vertical response function is the one‐dimensional sequence of weights that characterizes how the tool combines the rock conductivities along the borehole to form an output called the apparent conductivity; it is the system impulse response. The value of knowing this function lies in the possible use of filter theory to aid in data processing and interpretation. Two general notions establish the framework for the analysis. The first is that logging is a linear, convolutional operation. Second, the earth’s conductivity profile forms a stochastic process. The probabilistic component is fleshed out by reasonably based assumptions about the occurrence of bed boundaries and nature of conductivity changes across them. Brought together, these tenets create a characterization of the conductivity sequence that is not a stationary process, but rather is intrinsic, as defined in the discipline of geostatistics. Such a process is described by a variogram, and it is increments of the process that are stationary. The connection between the power spectrum of the measurement and the system response function is made when the convolutional model is merged with the conductivity process. Some examples of induction log functions are shown using these ideas. The analysis is presented in general terms for possibly wider application.

scholarly journals Unspeakable by C. Pignat

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Janice Kung
Keyword(s):  
New York ◽  
Young Adult ◽  
Academic Library ◽  
New York Times ◽  
Quebec City ◽  
Young Adult Novel ◽  
Before And After ◽  
The One ◽  
The University ◽  
The City

Pignat, Caroline. Unspeakable. Toronto: Razorbill, 2014. Print. Ellie Ryan is an eighteen-year-old girl who has suffered an insurmountable number of personal tragedies that have taught her the importance of perseverance. After her mother’s death, she finds herself unwanted by her father and is forced to move in with her aunt Geraldine. Due to Ellie’s inability to cope with her circumstances, her aunt sends her aboard the Empress of Ireland where she learns to embrace her new position as a stewardess with the help of her most trusted friend, Meg.On the second crossing of the Empress, Ellie meets Jim, a lonely fire stoker who has experienced his share of grief and tragedy, something Ellie is all too familiar with. After many chance encounters late at night along the ship's rail, she finds Jim writing in a journal. He is a quiet and secretive young man who doesn’t share much of his life, which intrigues and compels her to discover more about him. When the ship docks at Quebec City, they explore the city together, a memorable experience for her. However, tragedy strikes on their next voyage when the ship collides into another ship. Ellie appears to be the one of the few remaining crew members to survive the disaster and has no word of Jim’s whereabouts; it seems unlikely that Jim would have survived the frigid ocean. Wyatt Steele, a journalist with The New York Times, later asks Ellie for her story. She refuses at first, but unwittingly gives into him when he appears one day with Jim’s journal. Wyatt represents the last remaining hope she has to learn more about the man she had fallen in love with and to possibly discover what happened to him. In exchange for her story, he agrees to provide Jim’s journal as payment, one page at a time.               This young adult novel follows Ellie’s journey aboard the Empress of Ireland in 1914 and offers a realistic context for Canada’s worst maritime disaster. It explores themes of depression from the loss of family and friends, survivor’s guilt, and redemption. The story weaves an intricate plot that alternates the timeline before and after the ship’s sinking, in order for the reader to actively live through Ellie’s recollections in the present. Overall, the author intricately writes a romantic story in the backdrop of a historical Canadian event that is well suited to young adult audiences.Recommended: 4 out of 4 starsReviewer: Janice KungJanice Kung is an Academic Library Intern at the University of Alberta’s John W. Scott Health Sciences Library. She obtained her undergraduate degree in commerce and completed her MLIS in 2013. She believes that the best thing to beat the winter blues is to cuddle up on a couch and lose oneself in a good book.

scholarly journals Form Class and Its Use in Estimating Sawtimber Volume of Sugar Maple Trees

2010 ◽  
Vol 27 (2) ◽  
pp. 75-77
Author(s):  
Ralph D. Nyland ◽  
Diane Kiernan
Keyword(s):  
New York ◽  
Sugar Maple ◽  
Prediction Equation ◽  
Diameter Class ◽  
Form Class ◽  
Standing Trees ◽  
Class Average ◽  
Using Data ◽  
Estimate Form

Abstract The Mesavage-Girard form class for a composite of 242 sugar maple sawtimber trees in New York averaged 82 (±5.3), differing significantly from the regional average form class of 79 originally recommended in the Mesavage-Girard form class volume tables. Also, for 8 of 16 stands, the measured form class differed significantly from the recommended regional average. Findings suggest a need to estimate form class for each tree when making an inventory of sawtimber volume. A regression analysis using data from the 242 sample trees provided a prediction equation for estimating diameter inside bark at 17 ft height on the basis of dbh. That allows determination of a unique Mesavage-Girard form class for each diameter class of sugar maple trees and use of that diameter class average when computing the board-foot volume of standing trees.

Determination of the milk yield of sows and correction for loss of weight due to metabolic processes of piglets during suckling

1964 ◽  
Vol 6 (1) ◽  
pp. 119-123 ◽  
Author(s):  
R. L. Van Spaendonck ◽  
F. X. Vanschoubroek
Keyword(s):  
Milk Yield ◽  
The Body ◽  
The Other ◽  
Weight Changes ◽  
Metabolic Processes ◽  
Loss Of Weight ◽  
Before And After ◽  
The One ◽  
The Relationship

SUMMARYIn determining the milk yield of the sow by weighing the litter before and after suckling, loss of weight due to metabolic processes must be considered.An experiment is described to investigate the loss of weight of piglets caused by metabolic processes between two consecutive weighings, and to investigate the relationship between this loss on the one hand and the body weight and the age of the piglets on the other. Weight changes of 15 litters of average 9·8 piglets were studied during 66 weighing periods of 16 minutes, by putting the pigs in a cage, fixed on a differential balance. Each weighing period consisted of 8 periods of 2 minutes, so that in all, loss of weight was studied during 528 2-minute periods.

Clinical evaluation of new assays for determination of serum calcitonin concentrations

1991 ◽  
Vol 124 (5) ◽  
pp. 540-544 ◽  
Author(s):  
M. Weissel ◽  
H. Kainz ◽  
Eva Tyl ◽  
E. Ogunyemi ◽  
W. Woloszczuk
Keyword(s):  
Thyroid Cancer ◽  
Medullary Thyroid Cancer ◽  
Serum Calcitonin ◽  
Medullary Thyroid ◽  
The Family ◽  
Thyroid Glands ◽  
Before And After ◽  
Sandwich Type ◽  
The One

Abstract. In order to test the clinical usefulness of new commercially available kits for determination of calcitonin serum concentrations, we investigated the family (N=10) of a patient with medullary thyroid carcinoma and bilateral pheochromocytoma including his affected son, 10 athyreotic patients, totally thyroidectomized for non-medullary thyroid cancer, and 4 normal volunteers. Pentagastrin tests were performed in all subjects. Serum calcitonin levels before and after pentagastrin were determined by 4 kits. Kits A and B are immunoradiometric assays of the sandwich-type, kits C and D are radioimmunoassays, D being the one hitherto routinely used. Our results show that the new assays (kits A, B and C) have a better diagnostic accuracy in screening for medullary thyroid cancer than the RIA (kit D), hitherto used, where basal values overlapped with normals. Although basal values of normals were mostly near the detection limit of all 4 kits, kits A and B were sensitive enough to detect stimulation of calcitonin secretion by pentagastrin in all subjects with intact thyroid glands and kit C in most of them. The lack of increase in calcitonin after pentagastrin observed by kits A, B and C in athyreotic patients suggests deficiency of secretion of this hormone. Only kit D was unable to show this deficiency.

Quantifying spatiotemporal rhythm of stream metabolism along human disturbance gradients

2020 ◽  
Vol 56 ◽  
pp. 16
Author(s):  
Miraç Eryiğit ◽  
Fatih Evrendilek ◽  
Nusret Karakaya
Keyword(s):  
Gross Primary Production ◽  
Treatment Plant ◽  
Community Respiration ◽  
Stream Metabolism ◽  
Linear Regression Models ◽  
Comparison Results ◽  
Before And After ◽  
The One ◽  
Urban Wastewater Treatment

This study aimed at investigating the effects of the urban wastewater treatment plant (WTP) discharges on the metabolism of Büyüksu Stream (Bolu, Turkey), and modelling the metabolism components as a function of measured environmental variables. Dissolved oxygen (DO) and water temperatures (Tw) were measured to estimate montly stream metabolism in the four reaches: Before and after discharges of the WTP, and the headwaters of Abant Creek and Mudurnu Creek feeding Büyüksu Stream. The DO and Tw measurements were performed for 17 months between August 2015 and December 2016. Metabolism components of community respiration (Rc), gross primary production (GPP) and net ecosystem metabolism (NEM) were estimated by using the two-station method. According to naturality gradient (reach disturbance gradients: before and after discharges, and headwaters of the creeks), mean metabolism components were compared by performing the one-way analysis of variance. The comparison results showed that the WTP discharges increased the average Rc from −30.6 g O2 m−2 day−1 to −130.9 g O2 m−2 day−1, and had no significant impact on the average GPP, statistically (15.6 and 9.1 g O2 m−2 day−1 before and after discharges, respectively). Validations of the multiple non-linear regression models of NEM and Rc gave coefficients of determination of 74.9% and 66.6%, respectively.

Two-Stage Procedure for the Quantitative Determination of Autoprothrombin III Concentration and Some Applications

1967 ◽  
Vol 18 (01/02) ◽  
pp. 198-210 ◽  
Author(s):  
Ronald S Reno ◽  
Walter H Seegers
Keyword(s):  
Prothrombin Time ◽  
Factor Vii ◽  
Two Stage ◽  
Pronounced Increase ◽  
One Stage ◽  
Assay Procedure ◽  
Bovine Plasma ◽  
The One ◽  
Autoprothrombin C

SummaryA two-stage assay procedure was developed for the determination of the autoprothrombin C titre which can be developed from prothrombin or autoprothrombin III containing solutions. The proenzyme is activated by Russell’s viper venom and the autoprothrombin C activity that appears is measured by its ability to shorten the partial thromboplastin time of bovine plasma.Using the assay, the autoprothrombin C titre was determined in the plasma of several species, as well as the percentage of it remaining in the serum from blood clotted in glass test tubes. Much autoprothrombin III remains in human serum. With sufficient thromboplastin it was completely utilized. Plasma from selected patients with coagulation disorders was assayed and only Stuart plasma was abnormal. In so-called factor VII, IX, and P.T.A. deficiency the autoprothrombin C titre and thrombin titre that could be developed was normal. In one case (prethrombin irregularity) practically no thrombin titre developed but the amount of autoprothrombin C which generated was in the normal range.Dogs were treated with Dicumarol and the autoprothrombin C titre that could be developed from their plasmas decreased until only traces could be detected. This coincided with a lowering of the thrombin titre that could be developed and a prolongation of the one-stage prothrombin time. While the Dicumarol was acting, the dogs were given an infusion of purified bovine prothrombin and the levels of autoprothrombin C, thrombin and one-stage prothrombin time were followed for several hours. The tests became normal immediately after the infusion and then went back to preinfusion levels over a period of 24 hrs.In other dogs the effect of Dicumarol was reversed by giving vitamin K1 intravenously. The effect of the vitamin was noticed as early as 20 min after administration.In response to vitamin K the most pronounced increase was with that portion of the prothrombin molecule which yields thrombin. The proportion of that protein with respect to the precursor of autoprothrombin C increased during the first hour and then started to go down and after 3 hrs was equal to the proportion normally found in plasma.

The Plasmin Inhibitors of Plasma

1964 ◽  
Vol 12 (01) ◽  
pp. 119-125 ◽  
Author(s):  
Y Shamash ◽  
A Rimon
Keyword(s):  
Human Plasma ◽  
New Method ◽  
Normal Amount ◽  
Caseinolytic Activity ◽  
Before And After ◽  
Plasmin Inhibitors

SummaryA new method for the assay of plasmin inhibitors in human plasma is described. The method consists of determination of the caseinolytic activity of a standard plasmin solution before and after incubation with the inhibitor, with lysine added to the mixture as a stabilizer of plasmin. Using this method, it was found that plasma contains enough inhibitors to inactivate 30 caseinolytic units of plasmin, or 10 times the normal amount of plasminogen in human plasma.

FRACTIONAL DETERMINATIONS OF URINARY 17-KETOSTEROIDS IN HYPEREMESIS GRAVIDARUM

1962 ◽  
Vol 41 (1) ◽  
pp. 123-128 ◽  
Author(s):  
Pentti A. Järvinen ◽  
Sykkö Pesonen ◽  
Pirkko Väänänen
Keyword(s):  
Hyperemesis Gravidarum ◽  
First Trimester ◽  
Control Group ◽  
Before And After ◽  
Daily Urine ◽  
First Trimester Of Pregnancy ◽  
The Difference

ABSTRACT The fractional determination of 17-ketosteroids in the daily urine was performed in nine cases of hyperemesis gravidarum and in four control cases, in the first trimester of pregnancy both before and after corticotrophin administration. The excretion of total 17-KS is similar in the two groups. Only in the hyperemesis group does the excretion of total 17-KS increase significantly after corticotrophin administration. The fractional determination reveals no difference between the two groups of patients with regard to the values of the fractions U (unidentified 17-KS), A (androsterone) and Rest (11-oxygenated 17-KS). The excretion of dehydroepiandrosterone is significantly higher in the hyperemesis group than in the control group. The excretion of androstanolone seems to be lower in the hyperemesis group than in the control group, but the difference is not statistically significant. The differences in the correlation between dehydroepiandrosterone and androstanolone in the two groups is significant. The high excretion of dehydroepiandrosterone and low excretion of androstanolone in cases of hyperemesis gravidarum is a sign of adrenal dysfunction.

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