Study of inducer load and stress Interim report, 15 Feb. 1968 - 15 Oct. 1968

Literature survey, analytic formulations, and test rig designs for cavitating inducers in rocket engine turbopump

Yes, I Can: Perceptions of African American Students Regarding Their Academic Performance in Ninth-Grade Advanced Mathematics

This qualitative case study investigated and described the perceptions of successful African American students who gained and sustained access to the advanced mathematics pipeline. This study applied the self-efficacy framework to examine the beliefs of students regarding their motivation and academic performance in mathematics. The perceptions of teachers were also investigated. Data collection included eight student and two teacher interviews as well as analysis of student transcripts. These data were analyzed to answer the following research questions: 1) What are the comparisons between the perceptions of successful gifted and non-gifted, African American students regarding their performance in ninth-grade advanced mathematics? 2) What are teachers’ perceptions of the self- efficacy beliefs of African American students who are successful in ninth-grade advanced mathematics? Results of the study revealed that the majority of students attributed their success to the overarching theme of mastery experience. Additionally, both students and teachers referenced the value of peer interactions during instruction, which serves as evidence that vicarious experiences and social persuasion were also important contributors to students\u27 successful performance. Finally, the findings overwhelmingly indicated that students and teachers perceived the healthy combination of high teacher support and high student accuracy as important contributors to students’ success in ninth-grade advanced mathematics

Farm Tenure in South Dakota [:] Some of its Economic and Sociological Aspects

Almost without exception county land-use planning committees have listed tenancy among the more important land-use problems in South Dakota. This concern is due to the increase in tenancy, to the growing obstacles in the way of those who wish to become land owners and to some extent to the existence of unsatisfactory relationships between landlord and tenant. Tenancy, however, is only one aspect of the much broader land tenure picture which includes all phases of the control and use of the land. To become a farm owner has long been considered a desirable and legitimate ambition of farm operators, or even of farm laborers. The family size, owner-operated farm has been regarded as the backbone of American agriculture. There can be little doubt that this tradition was a product, in part at least, of the Homestead era, when land was to be had at a low money cost, even if it did frequently require considerable human endurance and effort. At any rate, since the closing of the frontier, individual ownership of family farms has lost ground. The facts of the real world have more and more been at variance with what people have believed should be the situation in land ownership. Modern farming is a highly commercialized enterprise, requiring for success costly equipment, credit, and specialized marketing experience and techniques. The amount of capital required to operate a modern farm has increased to such an extent that it has become increasingly difficult for an individual to accumulate it. Furthermore, the highly commercialized nature of modern agriculture makes it dependent upon markets which may fluctuate widely. Falling farm prices, coupled with heavy debt payments contracted in the purchase of a farm may wipe out all of the farmer\u27s equity in a few years. From a purely economic standpoint, therefore, it may be that the long accepted view that all farmers should own their farms needs to be amended; it is, in fact, being amended. The economic problem is concerned principally with effective use of resources. The problem is not how to make every farmer an owner, but how to promote a productive and stable agriculture. If it can be shown that in certain situations mortgaged ownership or tenancy offer better possibilities for coping with changing prices and markets, for having ready capital available to adopt new practices, then from the standpoint of full use of resources it may be best to have such tenure arrangements. A blanket statement that every farmer ought to own his own farm can no longer cover all cases. [Introduction pp 1-2

2016 Annual Report of the University of Kansas Health System Poison Control Center

Introduction. This is the 2016 Annual Report of the University ofKansas Health System Poison Control Center (PCC). The PCC is oneof 55 certified poison control centers in the United States and servesthe state of Kansas 24 hours a day, 365 days a year, with certified specialistsin poison information and medical toxicologists. The PCCreceives calls from the public, law enforcement, health care professionals,and public health agencies. All calls to the PCC are recordedelectronically in the Toxicall® data management system and uploadedin near real-time to the National Poison Data System (NPDS), whichis the data repository for all poison control centers in the U.S. Methods. All encounters reported to the PCC from January 1, 2016to December 31, 2016 were analyzed. Data recorded for each exposureincludes caller location, age, weight, gender, substance exposedto, nature of exposure, route of exposure, interventions, medicaloutcome, disposition and location of care. Encounters were classifiedfurther as human exposure, animal exposure, confirmed non-exposure,or information call (no exposure reported). Results. The PCC logged 21,965 total encounters in 2016, including20,713 human exposure cases. The PCC received calls from everycounty in Kansas. The majority of human exposure cases (50.4%, n =10,174) were female. Approximately 67% (n = 13,903) of human exposuresinvolved a child (defined as 19 years or less). Most encountersoccurred at a residence (94.0%, n = 19,476) and most calls (72.3%, n= 14,964) originated from a residence. The majority of human exposures(n = 18,233) were acute cases (exposures occurring over eighthours or less). Ingestion was the most common route of exposuredocumented (86.3%, n = 17,882). The most common reported substancein pediatric encounters was cosmetics/personal care products(n = 1,362), followed by household cleaning products (n = 1,301). Foradult encounters, sedatives/hypnotics/antipsychotics (n = 1,130) andanalgesics (n = 1,103) were the most frequently involved substances.Unintentional exposures were the most common reason for exposures(81.3%, n = 16,836). Most encounters (71.1%, n = 14,732) weremanaged in a non-healthcare facility (i.e., a residence). Among humanexposures, 14,679 involved exposures to pharmaceutical agents while10,176 involved exposure to non-pharmaceuticals. Medical outcomeswere 32% (n = 6,582) no effect, 19% (n = 3,911) minor effect, 8% (n =1,623) moderate effect, and 2% (n = 348) major effects. There were 15deaths in 2016 reported to the PCC. Number of exposures, calls fromhealthcare facilities, cases with moderate or major medical outcomes,and deaths all increased in 2016 compared to 2015. Conclusions. The results of the 2016 University of Kansas HealthSystem Poison Control annual report demonstrates that the centerreceives calls from the entire state of Kansas totaling over 20,000human exposures per year. While pediatric exposures remain themost common, there is an increasing number of calls from healthcarefacilities and for cases with serious outcomes. The experience of thePCC is similar to national data. This report supports the continuedvalue of the PCC to both public and acute health care in the state ofKansas. Kans J Med 2018;11(2):24-33

Geotechnical and Groundwater Site Characterization on the UMTRA Project

Reclamation of 24 inactive uranium mill tailngs piles involves remedial work to stabilize the piles for 1000 years. Site characterization of geotechnical and groundwater conditions at each site is undertaken prior to remedial action design. This paper describes the approach to UMTRA Project site characterization. A case history, Green River, is described. Details of site characterization costs for most sites are provided

SRB Environment Evaluation and Analysis. Volume 3: ASRB Plume Induced Environments

Contract NAS8-37891 was expanded in late 1989 to initiate analysis of Shuttle plume induced environments as a result of the substitution of the Advanced Solid Rocket Booster (ASRB) for the Redesigned Solid Rocket Booster (RSRB). To support this analysis, REMTECH became involved in subscale and full-scale solid rocket motor test programs which further expanded the scope of work. Later contract modifications included additional tasks to produce initial design cycle environments and to specify development flight instrumentation. Volume 3 of the final report describes these analyses and contains a summary of reports resulting from various studies

Scarification Technique Affects Germination of Stylisma pickeringii (Patterson bindweed ), an Illinois Endangered Plant

The seed coat of Stylistna pickeringii (Torr.) Gray var. pattersoni (Patterson bindweed), an endangered species of Illinois sand prairies, inhibits water uptake and seed germination. The purpose of this research was to find an effective and efficient way to scarify seeds of S. pickeringii to aid reintroduction into its natural habitat. Seeds were collected from sandy areas close to the Illinois River near Snicarte (Mason Co.), Illinois during the summers of 1998 and 1999. Experiments were conducted to determine the best scarification techniques (basal cut, sandpaper shakes, sulfuric acid, sand shakes and sonication). Initially, each technique was evaluated by scarifYing the seeds for different times (except for the basal cut). The optimal time for each scarification technique then was compared. Scarified seeds were germinated in petri dishes at 25 C, 16 h photoperiod, with a mean light intensity of 51 ,..... mol m- 2s- •. The basal cut, 48 h sandpaper shake, 120 min acid soak and 72 h sand shake techniques did not differ significantly in germination (96, 92, 84 and 84%, respectively). The sonicator technique and the unscarified control yielded only 4 and 0% germim1tion, respectively. For scarification of S. pickeringii seeds the 48 h sandpaper shake and 120 min acid soak were very effective and efficient relative to other techniques. Of these two techniques, the sandpaper shake is safer than the acid soak, although when scarifying large numbers of seed, the sandpaper shake would require a large shaker. The techniques have potential applicability to other threatened and endangered species whose seed coat also inhibits germination

Structural Synergy and Molecular Crosstalk between Bacterial Helicase Loaders and Replication Initiators

SummaryThe loading of oligomeric helicases onto replication origins marks an essential step in replisome assembly. In cells, dedicated AAA+ ATPases regulate loading, however, the mechanism by which these factors recruit and deposit helicases has remained unclear. To better understand this process, we determined the structure of the ATPase region of the bacterial helicase loader DnaC from Aquifex aeolicus to 2.7 Å resolution. The structure shows that DnaC is a close paralog of the bacterial replication initiator, DnaA, and unexpectedly shares an ability to form a helical assembly similar to that of ATP-bound DnaA. Complementation and ssDNA-binding assays validate the importance of homomeric DnaC interactions, while pull-down experiments show that the DnaC and DnaA AAA+ domains interact in a nucleotide-dependent manner. These findings implicate DnaC as a molecular adaptor that uses ATP-activated DnaA as a docking site for regulating the recruitment and correct spatial deposition of the DnaB helicase onto origins