Angelo State University

The LIGO detection of GW150914 provides an unprecedented opportunity to study the two-body motion of a compact-object binary in the large-velocity, highly nonlinear regime, and to witness the final merger of the binary and the excitation of uniquely relativistic modes of the gravitational field. We carry out several investigations to determine whether GW150914 is consistent with a binary black-hole merger in general relativity. We find that the final remnant's mass and spin, as determined from the low-frequency (inspiral) and high-frequency (postinspiral) phases of the signal, are mutually consistent with the binary black-hole solution in general relativity. Furthermore, the data following the peak of GW150914 are consistent with the least-damped quasinormal mode inferred from the mass and spin of the remnant black hole. By using waveform models that allow for parametrized general-relativity violations during the inspiral and merger phases, we perform quantitative tests on the gravitational-wave phase in the dynamical regime and we determine the first empirical bounds on several high-order post-Newtonian coefficients. We constrain the graviton Compton wavelength, assuming that gravitons are dispersed in vacuum in the same way as particles with mass, obtaining a 90%-confidence lower bound of 10^{13} km. In conclusion, within our statistical uncertainties, we find no evidence for violations of general relativity in the genuinely strong-field regime of gravity.

Following a major upgrade, the two advanced detectors of the Laser Interferometer Gravitational-wave Observatory (LIGO) held their first observation run between September 2015 and January 2016. With a strain sensitivity of 10^{-23}/sqrt[Hz] at 100 Hz, the product of observable volume and measurement time exceeded that of all previous runs within the first 16 days of coincident observation. On September 14, 2015, the Advanced LIGO detectors observed a transient gravitational-wave signal determined to be the coalescence of two black holes [B. P. Abbott et al., Phys. Rev. Lett. 116, 061102 (2016)], launching the era of gravitational-wave astronomy. The event, GW150914, was observed with a combined signal-to-noise ratio of 24 in coincidence by the two detectors. Here, we present the main features of the detectors that enabled this observation. At full sensitivity, the Advanced LIGO detectors are designed to deliver another factor of 3 improvement in the signal-to-noise ratio for binary black hole systems similar in mass to GW150914.

Patient delay in seeking treatment for acute coronary syndrome and stroke symptoms is the major factor limiting delivery of definitive treatment in these conditions. Despite decades of research and public education campaigns aimed at decreasing patient delay times, most patients still do not seek treatment in a timely manner. In this scientific statement, we summarize the evidence that (1) demonstrates the benefits of early treatment, (2) describes the extent of the problem of patient delay, (3) identifies the factors related to patient delay in seeking timely treatment, and (4) reveals the inadequacies of our current approaches to decreasing patient delay. Finally, we offer suggestions for clinical practice and future research.

Abstract A modification is given of the Benesi‐Hildebrand equation to determine the equilibrium constant for complex formation from spectrophotometric measurements. Difficulties arising from the use of either concentrations or mole fractions are discussed.

up to 10 times as high as that of summary scoring. 3 We suggest that the authors reanalyze their data using psychometric methods, such as Rasch analysis, that are based on item-response theory; such methods significantly reduce measurement noise and produce interval-level measurement.

Management practices for biomass production of bioenergy grasses may differ from management for forage. Our objective was to determine the yield and stand responses of ‘Alamo’ switchgrass ( Panicum virgatum L.) to N and P fertilization as affected by row spacing. A combination of five rates each of N and P were applied to plots during 1992 to 1998 at Stephenville, TX and 1993 to 1995 at Beeville, TX. Three row‐spacing treatments were applied as subplots. Biomass production was determined each year with a single harvest in late summer. Tiller density and tiller mass were measured during 1993 to 1996 at Stephenville. Biomass production was not influenced by the addition of P. Biomass production response to N at Beeville was greater in narrow rows than wide rows during the establishment year only. Biomass production responses to N were quadratic in 5 of 7 yr at Stephenville and linear at Beeville. A maximum yield of 22.5 Mg ha −1 occurred during 1995 at Stephenville at 168 kg N ha −1 . Lodging occurred at both locations but only at the 224 kg N ha −1 rate. Tiller density and mass increased as row width increased. Tiller mass also increased with increasing N fertility at Stephenville. This response was more important in determining biomass production than was tiller density. Average biomass production at 168 kg N ha −1 yr −1 was 14.5 and 10.7 Mg ha −1 yr −1 at Stephenville and Beeville, respectively. Biomass production without applied N tended to decline over the years. Our data indicated that switchgrass biomass production is sustainable at Stephenville only with the application of at least 168 kg N ha −1 yr −1 , but P application and row spacing are not crucial.

Journal Article The White Scourge: Mexicans, Blacks, and Poor Whites in Texas Cotton Culture Get access The White Scourge: Mexicans, Blacks, and Poor Whites in Texas Cotton Culture. By Foley Neil. (Berkeley: University of California Press, 1997. xv + 326 pp. Illustrations, charts, tables, notes, bibliography, index. $29.95.) Arnoldo De León Arnoldo De León Angelo State University Search for other works by this author on: Oxford Academic Google Scholar Western Historical Quarterly, Volume 29, Issue 3, Autumn 1998, Page 383, https://doi.org/10.2307/970581 Published: 01 August 1998

The structure of thallium dicyanoargentate(I) has been determined crystallographically. The crystal structure shows an Ag-Ag distance of 3.11 Å. This is the shortest Ag-Ag distance reported for any silver dicyanide salt whose crystal structure has been determined. Raman spectra of the compound show four nu(C)(-)(N) peaks that are well-resolved in the 10-80 K temperature range. This result agrees well with group theory analysis. Extended Hückel calculations using relativistic wave functions have been carried out for two models which describe the interactions between the Ag(CN)(2)(-) ions within the crystal structure of Tl[Ag(CN)(2)]. The results of these calculations indicate the formation of potential wells at short Ag-Ag distances. The data in this study suggest the significance of ligand-unsupported silver-silver interactions (argentophilicity) in Tl[Ag(CN)(2)]. Tl-Ag interactions are determined to be insignificant in the compound. Tl[Ag(CN)(2)] crystallizes in the monoclinic space group P2(1)/c (No. 14), with a = 7.798(1) Å, b = 14.685(3) Å, c = 8.566(2) Å, beta = 91.66(2) degrees, Z = 8, R = 0.0643, and R(w) = 0.0899.

Covalency in Ln-Cl bonds of Oh-LnCl6(x-) (x = 3 for Ln = Ce(III), Nd(III), Sm(III), Eu(III), Gd(III); x = 2 for Ln = Ce(IV)) anions has been investigated, primarily using Cl K-edge X-ray absorption spectroscopy (XAS) and time-dependent density functional theory (TDDFT); however, Ce L3,2-edge and M5,4-edge XAS were also used to characterize CeCl6(x-) (x = 2, 3). The M5,4-edge XAS spectra were modeled using configuration interaction calculations. The results were evaluated as a function of (1) the lanthanide (Ln) metal identity, which was varied across the series from Ce to Gd, and (2) the Ln oxidation state (when practical, i.e., formally Ce(III) and Ce(IV)). Pronounced mixing between the Cl 3p- and Ln 5d-orbitals (t2g* and eg*) was observed. Experimental results indicated that Ln 5d-orbital mixing decreased when moving across the lanthanide series. In contrast, oxidizing Ce(III) to Ce(IV) had little effect on Cl 3p and Ce 5d-orbital mixing. For LnCl6(3-) (formally Ln(III)), the 4f-orbitals participated only marginally in covalent bonding, which was consistent with historical descriptions. Surprisingly, there was a marked increase in Cl 3p- and Ce(IV) 4f-orbital mixing (t1u* + t2u*) in CeCl6(2-). This unexpected 4f- and 5d-orbital participation in covalent bonding is presented in the context of recent studies on both tetravalent transition metal and actinide hexahalides, MCl6(2-) (M = Ti, Zr, Hf, U).

In order to relate clinical, angiologic and brain-morphological findings, 107 patients with internal carotid artery occlusion were examined clinically and by Doppler sonography, computerized tomography and cerebral angiography. During computerized tomography, haemodynamically induced infarctions could be differentiated from those, caused by periocclusive embolism towards the major brain arteries. This differentiation was based on an integration of angiological as well as brain-morphological data and implicates some important diagnostic, therapeutic and prognostic consequences. The first group may benefit from immediate surgical restoration of carotid blood flow and have a relatively good prognosis. By contrast, subjects presenting territorial infarctions mostly experience severe and permanent neurological deficits. They should not undergo revascularization since endarterectomy increases the risk of cerebral hemorrhage but cannot cause clinical improvement. In five patients, following special angiographic techniques, the lesions of the internal carotid artery turned out to be pseudoocclusions. This condition threatens the patient considerably but is well accessible to surgical reconstruction. Thus, pseudooclusion seems to be one of the most convincing indication for emergency endarterectomy of the internal carotid artery.

Journal Article The Spanish Frontier in North America Get access The Spanish Frontier in North America. By Weber David J.. (New Haven: Yale University Press, 1992. xx + 579 pp. Illustrations, maps, notes, bibliography, index. $35.00.) Arnoldo De León Arnoldo De León Angelo State University Search for other works by this author on: Oxford Academic Google Scholar Western Historical Quarterly, Volume 24, Issue 2, May 1993, Pages 235–236, https://doi.org/10.2307/970938 Published: 01 May 1993

A modified retrospective interview technique (RIT) was employed with members of 53 blended families to determine the types of turning points they reported experiencing and the developmental trajectories of their respective blended family’s first 4 years. Findings revealed 15 primary types of turning points, of which ‘Changes in Household Configuration’, ‘Conflict’, ‘Holidays/Special Events’, ‘Quality Time’ and ‘Family Crisis’ were the most frequent. A cluster analysis revealed five basic trajectories of development for the first 48 months of family development: Accelerated, Prolonged, Stagnating, Declining and High-amplitude Turbulent. The trajectories differed in the overall positive-to-negative valence ratio, the frequency of conflict related events, the average amplitude of change in feeling like a family, and the current reported level of feeling like a family.

The wheat germ (embryonic axis and scutellum) represents about 2.5-3.8% of total seed weight and is an important by-product of the flour milling industry. The germ contains about 10-15% lipids, 26-35% proteins, 17% sugars, 1.5-4.5% fibre and 4% minerals, as well as significant quantities of bioactive compounds such as tocopherols [300-740 mg/kg dry matter (DM)], phytosterols (24-50 mg/kg), policosanols (10 mg/kg), carotenoids (4-38 mg/kg), thiamin (15-23 mg/kg) and riboflavin (6-10 mg/kg). Oil recovery is achieved by mechanical pressing or solvent extraction, which retrieve about 50% or 90% lipids, respectively; innovative approaches, such as supercritical carbon dioxide extraction, are also proposed. The oil is rich in triglycerides (57% of total lipids), mainly linoleic (18:2), palmitic (16:0) and oleic (18:1) acids, but relevant amounts of sterols, mono- and diglycerides, phospho- and glycolipids are present. The lypophilic antioxidants tocopherols and carotenoids are also abundant. The main by-product of oil extraction is defatted germ meal, which has high protein content (30-32%), is rich in albumin (34.5% of total protein) and globulin (15.6%), and thus presents a well-balanced amino acid profile. Its principal mineral constituents are potassium, magnesium, calcium, zinc and manganese, in decreasing order. Total flavonoid content is about 0.35 g rutin equivalent/100 g DM. The wheat germ is therefore a unique source of concentrated nutrients, highly valued as food supplement. While the oil is widely appreciated for its pharmaceutical and nutritional value, the defatted germ meal is a promising source of high-quality vegetable proteins. Better nutrient separation from the kernel and improved fractioning techniques could also provide high-purity molecules with positive health benefits.

We present a search for subsolar mass ultracompact objects in data obtained during Advanced LIGO's second observing run. In contrast to a previous search of Advanced LIGO data from the first observing run, this search includes the effects of component spin on the gravitational waveform. We identify no viable gravitational-wave candidates consistent with subsolar mass ultracompact binaries with at least one component between $0.2\text{ }\text{ }{M}_{\ensuremath{\bigodot}}--1.0\text{ }\text{ }{M}_{\ensuremath{\bigodot}}$. We use the null result to constrain the binary merger rate of ($0.2\text{ }\text{ }{M}_{\ensuremath{\bigodot}}$, $0.2\text{ }\text{ }{M}_{\ensuremath{\bigodot}}$) binaries to be less than $3.7\ifmmode\times\else\texttimes\fi{}{10}^{5}\text{ }\text{ }{\mathrm{Gpc}}^{\ensuremath{-}3}\text{ }{\mathrm{yr}}^{\ensuremath{-}1}$ and the binary merger rate of ($1.0\text{ }\text{ }{M}_{\ensuremath{\bigodot}}$, $1.0\text{ }\text{ }{M}_{\ensuremath{\bigodot}}$) binaries to be less than $5.2\ifmmode\times\else\texttimes\fi{}{10}^{3}\text{ }\text{ }{\mathrm{Gpc}}^{\ensuremath{-}3}\text{ }{\mathrm{yr}}^{\ensuremath{-}1}$. Subsolar mass ultracompact objects are not expected to form via known stellar evolution channels, though it has been suggested that primordial density fluctuations or particle dark matter with cooling mechanisms and/or nuclear interactions could form black holes with subsolar masses. Assuming a particular primordial black hole (PBH) formation model, we constrain a population of merging $0.2\text{ }\text{ }{M}_{\ensuremath{\bigodot}}$ black holes to account for less than 16% of the dark matter density and a population of merging $1.0\text{ }\text{ }{M}_{\ensuremath{\bigodot}}$ black holes to account for less than 2% of the dark matter density. We discuss how constraints on the merger rate and dark matter fraction may be extended to arbitrary black hole population models that predict subsolar mass binaries.

This study investigated the effect of active-learning strategies on college students' achievement, motivation, and self-efficacy in a human physiology course for nonmajors. Variables were studied via a quasi-experimental, Solomon four-group design on 141 students at a small west-Texas university. Treatment groups were taught using a continuum-based, active-learning model implemented over the course of a semester. Control groups were taught using traditional didactic lecture methods. To assess the effects of the continuum-based active learning strategies, students were administered a comprehensive physiology content exam, the Motivated Strategies for Learning Questionnaire, and attitude surveys. Factorial analyses indicated that the treatment groups acquired significantly more content knowledge and were significantly more self-efficacious than students in the control groups. There were no significant differences in motivation. Attitude surveys indicated that students in both the treatment and control groups demonstrated a positive attitude toward active learning, believed it helped (or would help) them to learn the material, and would choose an active learning course in the future.

PRIMARY OBJECTIVE: To determine the extent to which the Brunnstrom recovery stages of upper limb in hemiparetic stroke patients are correlated to neurophysiological measures and the spasticity measure of Modified Modified Ashworth Scale (MMAS). RESEARCH DESIGN: A concurrent criterion-related validity study. INTERVENTIONS: Not applicable. METHODS AND PROCEDURES: Thirty patients (15 men and 15 women; mean ± SD = 58.8 ± 11.5 years) with upper limb spasticity after stroke were recruited. Wrist flexor spasticity was rated using the MMAS. The neurophysiological measures were Hslp/Mslp ratio, H(max)/M(max) ratio and Hslp. MAIN OUTCOMES AND RESULTS: There was a significant moderate correlation between the Brunnstrom recovery stages and the neurophysiological measures. The Brunnstrom recovery stages were highly correlated to the MMAS scores (r = -0.81, p < 0.0001). CONCLUSIONS: The Brunnstrom recovery stages are moderately correlated with neurophysiological measures and highly correlated with the MMAS regarding the evaluation of motor recovery in stroke patients. The Brunnstrom recovery stages can be used as a valid test for the assessment of patients with post-stroke hemiplegia.

The focus of this work was on the relation between grammatical gender and categorization. In one set of studies, monolingual English-, Spanish-, French-, and German-speaking children and adults assigned male and female voices to inanimate objects. Results from Spanish and French speakers indicated effects of grammatical gender on classification; results from German speakers did not. A connectionist model simulated the contradicting findings. The connectionist networks were also used to investigate which aspect of grammatical gender was responsible for the different pattern of findings. The predictions from the connectionist simulations were supported by the results from an artificial language-learning task. The results from this work demonstrate how connectionist networks can be used to identify the differences between languages that affect categorization.

Abstract Background According to a growing body of research, many Latinas/os experience dissonance between their everyday cultural practices and the cultural practices prevalent in engineering. This dissonance contributes to many Latinas/os' sense that engineering is “not for me.” Purpose This study sought to explore the meaning in the relationship between engineering cultural practices and the funds of knowledge found in Latina/o adolescents' familial, community, and recreational settings. Design/Method This ethnographic study followed seven groups of Latina/o adolescents as they identified problems in their communities and solved them through engineering design processes. Using a modified form of constant comparative analysis, we analyzed three data sources: individual interviews, observations of group meetings, and concurrent or retrospective protocols. We developed a coding scheme that categorized the participants' funds of knowledge as they related to engineering. Results The participants' everyday skills and bodies of knowledge aligned with engineering practices. Specifically, their familial, community, and recreational funds of knowledge mapped onto the application of engineering design processes, systems thinking, ethical and empathetic reasoning, knowledge of production and processing, use of communication and construction tools, scientific and mathematical knowledge, and teamwork. Conclusions Engineering instruction for Latina/o adolescents can be reconceptualized as a third space of learning and knowing where adolescents' everyday familial, community, and recreational practices are actively solicited and connected with the cultural practices of engineering.

The objective of the study was to develop and validate a translated and culturally adapted Mini-Mental State Examination (MMSE) for the Persian-speaking population. The MMSE was translated into Persian. Two groups of neurologically intact subjects (n = 100) and subjects with Alzheimer's disease (n = 13) were studied. The difference between groups on the mean total scores of the Persian MMSE was statistically significant (control = 28.62 +/- 2.09; subjects with Alzheimer's disease = 11.77 +/- 5.66; p < .001). The cutoff score of 23 was the best cutoff score for our subjects with a sensitivity and specificity of 98% and 100%, respectively. There was a significant correlation between the Persian MMSE score and the level of education (r = .46) and with age (r = -.77). There was no significant correlation between the Persian MMSE and gender. The Persian MMSE was found to be valid for discrimination of cognitive impairment in the Persian-speaking community.

Two studies were conducted to examine expert opinions of criteria used to select forecasting techniques. In Study One, while “accuracy” was a dominant criterion, the ratings of five of thirteen criteria varied by the role of the forecaster. Researchers rated accuracy relatively higher than did practitioners, educators or decision-makers. Decision makers rated implementation-related criteria, such as “ease” criteria, relatively higher than the other groups. In Study Two, forecasting experts significantly varied their ratings on six of seven criteria according to situations. Other criteria were often as important or more important than accuracy, especially when the situation involved making many forecasts. In general, there was much agreement across roles and across situations that accuracy was the most important criterion, but other criteria were rated as being almost as important. In particular, factors related to implementation, such as ease of interpretation and ease of use, were highly rated.