488 research outputs found
Letter from Alden Anderson to John Muir, 1904 Jul 15.
ALDEN ANDERSON,LIEUTENANT-GOVERNOR,CALIFORNIA,1903-1907.Sacramento, Calif., July 15, 1904.Hon. John Muir,Martinez, Calif.My dear Mr. Muir:-Your favor in reply of the 13th inst. duly to hand. We had a conference this morning with Major Chittendon, Mr. R. D. Marshall and Mr. Prank Bond. There were present either in person or by representation, practically all the State officials; Senator Devlin of Sacramento, Senator Rowell of Fresno, former Congressman Loutitt of Stockton and several others. I read your letter to the assembled conference and your suggestions were very well received. I desire to thank you for going into the matter to the extent you did, and congratulate you upon the concise manner in which you state your views and your opinion as to the necessary action to be taken by the State of California and the Federal Government to put the Yosemite Park and its environments on the proper basis.With an expression of personal regards and kind remembrances, I am,Very truly yours,[Illegible]G.P.03407O3Y0?
Institutional Experience with Academic Reform: A Panel Discussion
This paper consists of the transcripts of a panel discussion focusing on athletic directors’, chancellors’, and presidents’ experiences with academic reform. The panel participants discuss a number of topics, including recent and past academic reform efforts, the process of implementing those initiatives, and the effects of those policies on student athletes and intercollegiate sport
Shape Space Methods for Quantum Cosmological Triangleland
With toy modelling of conceptual aspects of quantum cosmology and the problem
of time in quantum gravity in mind, I study the classical and quantum dynamics
of the pure-shape (i.e. scale-free) triangle formed by 3 particles in 2-d. I do
so by importing techniques to the triangle model from the corresponding 4
particles in 1-d model, using the fact that both have 2-spheres for shape
spaces, though the latter has a trivial realization whilst the former has a
more involved Hopf (or Dragt) type realization. I furthermore interpret the
ensuing Dragt-type coordinates as shape quantities: a measure of
anisoscelesness, the ellipticity of the base and apex's moments of inertia, and
a quantity proportional to the area of the triangle. I promote these quantities
at the quantum level to operators whose expectation and spread are then useful
in understanding the quantum states of the system. Additionally, I tessellate
the 2-sphere by its physical interpretation as the shape space of triangles,
and then use this as a back-cloth from which to read off the interpretation of
dynamical trajectories, potentials and wavefunctions. I include applications to
timeless approaches to the problem of time and to the role of uniform states in
quantum cosmological modelling.Comment: A shorter version, as per the first stage in the refereeing process,
and containing some new reference
Positive Aspects of Family Caregiving for Dementia: Differential Item Functioning by Race
Due to increasing interest in the positive experiences associated with family caregiving, potential demographic group differences were examined on the Positive Aspects of Caregiving (PAC) scale at both the item and scale levels
Determination of Region of Influence Obtained by Aircraft Vertical Profiles Using the Density of Trajectories from the HYSPLIT Model
Aircraft atmospheric profiling is a valuable technique for determining greenhouse gas fluxes at regional scales (104–106 km2). Here, we describe a new, simple method for estimating the surface influence of air samples that uses backward trajectories based on the Lagrangian model Hybrid Single-Particle Lagrangian Integrated Trajectory Model (HYSPLIT). We determined “regions of influence” on a quarterly basis between 2010 and 2018 for four aircraft vertical profile sites: SAN and ALF in the eastern Amazon, and RBA and TAB or TEF in the western Amazon. We evaluated regions of influence in terms of their relative sensitivity to areas inside and outside the Amazon and their total area inside the Amazon. Regions of influence varied by quarter and less so by year. In the first and fourth quarters, the contribution of the region of influence inside the Amazon was 83–93% for all sites, while in the second and third quarters, it was 57–75%. The interquarter differences are more evident in the eastern than in the western Amazon. Our analysis indicates that atmospheric profiles from the western sites are sensitive to 42–52.2% of the Amazon. In contrast, eastern Amazon sites are sensitive to only 10.9–25.3%. These results may help to spatially resolve the response of greenhouse gas emissions to climate variability over Amazon
The gravity of China's African export promise
Africa’s largest trade partner, China, criticised for exchanging resources for manufactures, has promised to increase imports and optimise the structure of trade with Africa. Using a gravity model of China’s imports for the years 1995- 2009, we explore potential dynamics for this promise, uniquely accounting for market economy recognition and Taiwan recognition. The former is associated with increased imports, while the latter effect is ambiguous and statistically insignificant. Comparison of projected against actual imports across three growth-path-aligned economic geography typologies - resource-rich; landlocked and resource-poor; coastal and resource-poor – sets out China’s imports trends in an abstract framework of African export potential. We find not only ‘under’ importing across a majority of resource-poor countries. We also find that current trade policy is the least applicable to these comparatively poor exporters’ trade with China. If the latter are to serve a broader catalytic role in Africa’s regional industrial transformation as compared to the role of coastal and resource poor countries in regional economic transformation in Asia and Latin America, China-Africa trade and investment policies may need additional thinking
Development of adenovirus immobilization strategies for in situ gene therapy
Background Regenerative gene therapy using viral vectors enables transduced cells to express bioactive factors in vivo . Viral delivery with spatial control can enhance transduction efficiency and may limit systemic infection. Consequently, we tethered biotinylated adenovirus via interactions with avidin on chitosan surfaces to gain robust control for in situ transduction. Methods Avidin was either directly conjugated to chitosan (virus–biotin–avidin-material; VBAM) or indirectly docked on biotinylated chitosan surfaces (virus–biotin–avidin–biotin-material; VBABM) to tether biotinylated adenovirus. Enzyme-linked immunosorbent assay (ELISA) and spectroscopic analysis were performed to demonstrate the binding profiles. Biotin-alkaline phosphatase and biotinylated adenovirus were used as different sized particles to evaluate binding efficiencies and were compared by the Sips isotherm adsorption method. Scanning electron microscopy (SEM) examination illustrated virus distribution, and the transduction efficiency was determined by in vitro cell transduction. Results ELISA and spectroscopic analysis both demonstrated that the VBAM system led to multilayer avidin formation on biomaterial surfaces, whereas VBABM formed a monolayer of avidin. Sips isotherm adsorption indicated that the VBAM method increased heterogeneity and steric hindrance of binding sites. By contrast, the VBABM method docked avidin on chitosan surfaces and orientated the binding sites to facilitate ligand binding. In addition, SEM images illustrated that the VBABM method led to more even viral distribution. In vitro cell infection experiments also demonstrated that the VBABM system enhanced virus immobilization and thus improved cell transduction efficiency over the VBAM system. Conclusions The VBABM strategy is a superior method for in situ transduction from biomaterials. This strategy could be adapted for use with a variety of biomaterials as well as viral vectors, and thus may be an alternative method for in vivo regenerative gene therapy. Copyright © 2008 John Wiley & Sons, Ltd.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/60964/1/1233_ftp.pd
Public-sector service provision for older people affected by homelessness in England
This paper assesses provision for older people affected by homelessness in England, giving regard to research findings, such as those developed through a pathways model, which show that the experiences of this group are qualitatively distinct when compared to younger households. Current conceptualisations of older age held by Local Authority Housing Option Service professionals are considered, alongside factors relating to government policy and resource issues. It was found that some practitioners adopted an age-blind approach when assessing older groups, despite this being contrary to policy guidance on assessing vulnerability in England. Further, services and housing options aimed at older groups were viewed as inadequate due to a mixture of lack of awareness, targeting and resources. It is concluded that assessment of vulnerability based on older age is complex, as whilst gerontological discourse may discourage viewing age as a number, homelessness scholars stress that rooflessness causes poor health conditions consistent with premature ageing. It is therefore asserted that policy makers must focus greater attention to developing suitable provision for older service users and look to incorporate a richer conceptualisation of how older age may impact upon the homelessness experience
An Innovative, Prospective, Hybrid Cohort-Cluster Study Design to Characterize Dengue Virus Transmission in Multigenerational Households in Kamphaeng Phet, Thailand
Difficulties inherent in the identification of immune correlates of protection or severe disease have challenged the development and evaluation of dengue vaccines. There persist substantial gaps in knowledge about the complex effects of age and sequential dengue virus (DENV) exposures on these correlations. To address these gaps, we were conducting a novel family-based cohort-cluster study for DENV transmission in Kamphaeng Phet, Thailand. The study began in 2015 and is funded until at least 2023. As of May 2019, 2,870 individuals in 485 families were actively enrolled. The families comprise at least 1 child born into the study as a newborn, 1 other child, a parent, and a grandparent. The median age of enrolled participants is 21 years (range 0–93 years). Active surveillance is performed to detect acute dengue illnesses, and annual blood testing identifies subclinical seroconversions. Extended follow-up of this cohort will detect sequential infections and correlate antibody kinetics and sequence of infections with disease outcomes. The central goal of this prospective study is to characterize how different DENV exposure histories within multigenerational family units, from DENV-naive infants to grandparents with multiple prior DENV exposures, affect transmission, disease, and protection at the level of the individual, household, and community
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