Viewing the American West as a Chicana in China

In both scholarly work and popular imagination, the American West is the final destination of migrant from Europe and Mexico. The stories of those migrants, however, obscure the first migration (12,000 BP) from Asia into North America. That migration across the now-submerged land bridge of Beringia ended humanity’s millennia-long journey across the globe that originated in Africa more than 50,000 years earlier. Using two examples, this essay reflects on how the Asian origins of the first Americans have been transformed into myths that conceal humanity’s migratory nature. First, in Chinese Communist propaganda, those origins are transformed into the myth of Peking Man as a branch of humanity originating in China rather than Africa. Second, in the writing of Rudolfo Anaya, those Asian origins are transformed into the myth of homogenous “Brown Brothers” united against white imperialists. Rather than rely on a myth of racial unity in some original homeland, this essay urges reliance on the shared experience of migration and home-making in hostile environments as the true source of our common humanity. Anaya’s Golden Carp, symbol of the life-giving fierce of water in an arid environment, captures this common human predicament stretching from Tibet and Xinjiang to New Mexico, epitomizing the American West as the place where humanity has been reunited, the home to the last wanderers of the human race.

Noise Suppression Using a Near-Source Wavelet

Denoising becomes a non-trivial task when noise and signal overlap in multiple domains such as time, frequency, and velocity. Fortunately, signal and noise waveforms in general tend to remain morphologically different. This paper shows how morphological differences can be used to separate body-wave signals from other waveforms such as ground roll and cultural noise. The key was finding a wavelet that was a close approximation of the true source signature (SS) and remained uncontaminated by the Green’s function in any significant manner. An inverse filter designed using such a wavelet selectively compressed the body waves which was then extracted using median and low-pass filters. The overall phenomenon is explained with a synthetic example. The idea is also tested on a land dataset that was generated using a large weight drop source where a wavelet recorded ∼3 m from the source location fulfilled the criteria set in the proposed method. Results suggest that the incremental effort of recording an extra trace close to the source location during acquisition may provide previously unavailable denoising opportunities during processing although the trace itself may be redundant for imaging.

Cannabis Glandular Trichomes: A Cellular Metabolite Factory

Cannabis has been legalized for recreational use in several countries and medical use is authorized in an expanding list of countries; markets are growing internationally, causing an increase in demand for high quality products with well-defined properties. The key compounds of Cannabis plants are cannabinoids, which are produced by stalked glandular trichomes located on female flowers. These trichomes produce resin that contains cannabinoids, such as tetrahydrocannabinolic acid and cannabidiolic acid, and an array of other secondary metabolites of varying degrees of commercial interest. While growers tend to focus on improving whole flower yields, our understanding of the “goldmines” of the plant – the trichomes – is limited despite their being the true source of revenue for a multi-billion-dollar industry. This review aims to provide an overview of our current understanding of cannabis glandular trichomes and their metabolite products in order to identify current gaps in knowledge and to outline future research directions.

Impact of imprecise household location on effective coverage estimates generated through linking household and health provider data by geographic proximity: a simulation study

Background Geographic proximity is often used to link household and health provider data to estimate effective coverage of health interventions. Existing household surveys often provide displaced data on the central point within household clusters rather than household location. This may introduce error into analyses based on the distance between households and providers. Methods We assessed the effect of imprecise household location on quality-adjusted effective coverage of child curative services estimated by linking sick children to providers based on geographic proximity. We used data on care-seeking for child illness and health provider quality in Southern Province, Zambia. The dataset included the location of respondent households, a census of providers, and data on the exact outlets utilized by sick children included in the study. We displaced the central point of each household cluster point five times. We calculated quality-adjusted coverage by assigning each sick child to a provider’s care based on three measures of geographic proximity (Euclidean distance, travel time, and geographic radius) from the household location, cluster point, and displaced cluster locations. We compared the estimates of quality-adjusted coverage to each other and estimates using each sick child’s true source of care. We performed sensitivity analyses with simulated preferential care-seeking from higher-quality providers and randomly generated provider quality scores. Results Fewer children were linked to their true source of care using cluster locations than household locations. Effective coverage estimates produced using undisplaced or displaced cluster points did not vary significantly from estimates produced using household location data or each sick child’s true source of care. However, the sensitivity analyses simulating greater variability in provider quality showed bias in effective coverage estimates produced with the geographic radius and travel time method using imprecise location data in some scenarios. Conclusions Use of undisplaced or displaced cluster location reduced the proportion of children that linked to their true source of care. In settings with minimal variability in quality within provider categories, the impact on effective coverage estimates is limited. However, use of imprecise household location and choice of geographic linking method can bias estimates in areas with high variability in provider quality or preferential care-seeking.

Assessing the Forensic Value of DNA Evidence from Y Chromosomes and Mitogenomes

Y chromosome and mitochondrial DNA profiles have been used as evidence in courts for decades, yet the problem of evaluating the weight of evidence has not been adequately resolved. Both are lineage markers (inherited from just one parent), which presents different interpretation challenges compared with standard autosomal DNA profiles (inherited from both parents). We review approaches to the evaluation of lineage marker profiles for forensic identification, focussing on the key roles of profile mutation rate and relatedness (extending beyond known relatives). Higher mutation rates imply fewer individuals matching the profile of an alleged contributor, but they will be more closely related. This makes it challenging to evaluate the possibility that one of these matching individuals could be the true source, because relatives may be plausible alternative contributors, and may not be well mixed in the population. These issues reduce the usefulness of profile databases drawn from a broad population: larger populations can have a lower profile relative frequency because of lower relatedness with the alleged contributor. Many evaluation methods do not adequately take account of distant relatedness, but its effects have become more pronounced with the latest generation of high-mutation-rate Y profiles.

Space to Air High-Altitude Region Adjoint Neutron Transport

Neutrons from an atmospheric nuclear explosion can be detected by sensors in orbit. Current tools for characterizing the neutron energy spectrum assume a known source and use forward transport to recreate the detector response. In realistic scenarios the true source is unknown, making this an inefficient, iterative approach. In contrast, the adjoint approach directly solves for the source spectrum, enabling source reconstruction. The time–energy fluence at the satellite and adjoint transport equation allow a Monte Carlo method to characterize the neutron source’s energy spectrum directly in a new model: the Space to High-Altitude Region Adjoint (SAHARA) model. A new adjoint source event estimator was developed in SAHARA to find feasible solutions to the neutron transport problem given the constraints of the adjoint environment. This work explores SAHARA’s development and performance for mono-energetic and continuous neutron energy sources. In general, the identified spectra were shifted towards energies approximately 5% lower than the true source spectra, but SAHARA was able to capture the correct spectral shapes. Continuous energy sources, including real-world sources Fat Man and Little Boy, resulted in identifiable spectra that could have been produced by the same distribution as the true sources as demonstrated by two-dimensional (2D) Kolmogorov–Smirnov tests.

Self-Respect, Arrogance, and Power

Robin S. Dillon reconsiders her influential previous position, that arrogance involves a failure to recognize the true source of one’s own value, as a rational being with the status to demand equal respect. On this view, arrogance and self-respect are antithetical. In this chapter, Dillon revises her position, taking into account differences in power in societies. For people who are oppressed, arrogance (claiming more than society thinks is appropriate) may be compatible with, or even necessary for, self-respect. Neither people within a society, nor we as observers, can claim an objective perspective in adjudicating the issue of whether these claims are warranted, or excessive. Furthermore, it may be objectively true that, in some circumstances, arrogance is a necessary tool for overcoming oppression.

Research on the Ways of People’s Participation in Anti-terrorism from the Perspective of National Anti-terrorism

Anti-terrorism by the whole people is inseparable from the extensive participation of the people. Historical experience has shown that the people are the true source of strength and the deepest source of war’s might. The anti-terrorist struggle is a fundamental contradiction between the enemy and ours. It is a long-lasting and long-term struggle. It requires the implementation of the fundamental strategy of "combination of prevention and combat, and the focus on prevention" and the extensive participation of the people. At present, the situation in the domestic fight against terrorism is still severe and complex, and there are still many problems in intelligence and information, group defense and group governance, and emergency rescue. To win the final victory in the fight against terrorism, we must create new ways for the people to participate in the fight against terrorism.

Characterisation of seismic events using time-reverse imaging

<p>In addition to stable and accurate hypocenters of seismic events, the characterisation of events is crucial for the investigation of seismicity in the context of geothermal reservoirs, CO2-sequestration and other geotechnical applications. Since the origin and nature of the seismicity in such cases is still under investigation, tools should rely on as few a priori assumptions about the sources as possible. Here, an approach is presented to determine the time-dependent moment tensor and origin time in addition to commonly derived hypocenter locations of seismic events using time-reverse imaging (TRI). The full six component moment tensor is derived and may be used to display for example focal mechanisms. The workflow consists of determining the location of potential sources, discriminating artificial and true source locations and obtaining the time-dependent moment tensors by recording the stress components at the derived source locations. Since TRI does not rely on the identification of seismic phases but on the simulation of the time-reversed wavefield through an adequate velocity model, no assumptions about the source location or the type of source mechanism is made. TRI is less affected by low signal-to-noise ratios and is thus promising for noisier sites and quasi-simultaneous events. However, a sufficient number of seismic stations are needed to accurately sample the wavefield spatially. The proposed workflow is demonstrated by locating and characterising microseismic events in the geothermal field of Los Humeros, Mexico. Although higher levels of noise are present and only a one-dimensional velocity model is available at this time, selected events could be located and characterised.</p>