Evolutionary diffusion: internal and external methods used to acquire encompassing, complementary, and incremental technological changes in the lithotripsy industry

This study links theories concerning methods that firms use to acquire technology with theories concerning types of technological change. We place particular emphasis on interorganizational relationships. We predict that firms will often acquire know-how needed for encompassing technological change through equity-based arrangements with other organizations, complementary technological changes through nonequity interorganizational arrangements, and incremental changes through internal R&D. Our theory draws on perspectives that emphasize the need to develop new competencies within a business organization and to protect the value of existing competencies. Our empirical analysis examines methods of technology acquisition that firms have used in the commercialization of medical lithotripters, which are devices that fragment stones in the kidney and gall bladder. The analysis contributes to a better understanding of how technology acquisition methods vary with the manner in which technological change relates to a firm’s existing capabilities. The study also helps develop our understanding of the evolutionary processes by which capabilities diffuse through an industry. © 1998 John Wiley & Sons, Ltd.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/34604/1/993_ftp.pd

Search for Eccentric Black Hole Coalescences during the Third Observing Run of LIGO and Virgo

Despite the growing number of confident binary black hole coalescences observed through gravitational waves so far, the astrophysical origin of these binaries remains uncertain. Orbital eccentricity is one of the clearest tracers of binary formation channels. Identifying binary eccentricity, however, remains challenging due to the limited availability of gravitational waveforms that include effects of eccentricity. Here, we present observational results for a waveform-independent search sensitive to eccentric black hole coalescences, covering the third observing run (O3) of the LIGO and Virgo detectors. We identified no new high-significance candidates beyond those that were already identified with searches focusing on quasi-circular binaries. We determine the sensitivity of our search to high-mass (total mass $M>70$ $M_\odot$) binaries covering eccentricities up to 0.3 at 15 Hz orbital frequency, and use this to compare model predictions to search results. Assuming all detections are indeed quasi-circular, for our fiducial population model, we place an upper limit for the merger rate density of high-mass binaries with eccentricities $0 < e \leq 0.3$ at $0.33$ Gpc$^{-3}$ yr$^{-1}$ at 90\% confidence level.Comment: 24 pages, 5 figure

Open data from the third observing run of LIGO, Virgo, KAGRA and GEO

The global network of gravitational-wave observatories now includes five detectors, namely LIGO Hanford, LIGO Livingston, Virgo, KAGRA, and GEO 600. These detectors collected data during their third observing run, O3, composed of three phases: O3a starting in April of 2019 and lasting six months, O3b starting in November of 2019 and lasting five months, and O3GK starting in April of 2020 and lasting 2 weeks. In this paper we describe these data and various other science products that can be freely accessed through the Gravitational Wave Open Science Center at https://gwosc.org. The main dataset, consisting of the gravitational-wave strain time series that contains the astrophysical signals, is released together with supporting data useful for their analysis and documentation, tutorials, as well as analysis software packages.Comment: 27 pages, 3 figure

Search for eccentric black hole coalescences during the third observing run of LIGO and Virgo

Despite the growing number of confident binary black hole coalescences observed through gravitational waves so far, the astrophysical origin of these binaries remains uncertain. Orbital eccentricity is one of the clearest tracers of binary formation channels. Identifying binary eccentricity, however, remains challenging due to the limited availability of gravitational waveforms that include effects of eccentricity. Here, we present observational results for a waveform-independent search sensitive to eccentric black hole coalescences, covering the third observing run (O3) of the LIGO and Virgo detectors. We identified no new high-significance candidates beyond those that were already identified with searches focusing on quasi-circular binaries. We determine the sensitivity of our search to high-mass (total mass M&gt;70 M⊙) binaries covering eccentricities up to 0.3 at 15 Hz orbital frequency, and use this to compare model predictions to search results. Assuming all detections are indeed quasi-circular, for our fiducial population model, we place an upper limit for the merger rate density of high-mass binaries with eccentricities 0&lt;e≤0.3 at 0.33 Gpc−3 yr−1 at 90\% confidence level

Observation of gravitational waves from the coalescence of a 2.5–4.5 M ⊙ compact object and a neutron star

We report the observation of a coalescing compact binary with component masses 2.5–4.5 M ⊙ and 1.2–2.0 M ⊙ (all measurements quoted at the 90% credible level). The gravitational-wave signal GW230529_181500 was observed during the fourth observing run of the LIGO–Virgo–KAGRA detector network on 2023 May 29 by the LIGO Livingston observatory. The primary component of the source has a mass less than 5 M ⊙ at 99% credibility. We cannot definitively determine from gravitational-wave data alone whether either component of the source is a neutron star or a black hole. However, given existing estimates of the maximum neutron star mass, we find the most probable interpretation of the source to be the coalescence of a neutron star with a black hole that has a mass between the most massive neutron stars and the least massive black holes observed in the Galaxy. We provisionally estimate a merger rate density of 55−47+127Gpc−3yr−1 for compact binary coalescences with properties similar to the source of GW230529_181500; assuming that the source is a neutron star–black hole merger, GW230529_181500-like sources may make up the majority of neutron star–black hole coalescences. The discovery of this system implies an increase in the expected rate of neutron star–black hole mergers with electromagnetic counterparts and provides further evidence for compact objects existing within the purported lower mass gap

Ultralight vector dark matter search using data from the KAGRA O3GK run

Among the various candidates for dark matter (DM), ultralight vector DM can be probed by laser interferometric gravitational wave detectors through the measurement of oscillating length changes in the arm cavities. In this context, KAGRA has a unique feature due to differing compositions of its mirrors, enhancing the signal of vector DM in the length change in the auxiliary channels. Here we present the result of a search for U(1)B−L gauge boson DM using the KAGRA data from auxiliary length channels during the first joint observation run together with GEO600. By applying our search pipeline, which takes into account the stochastic nature of ultralight DM, upper bounds on the coupling strength between the U(1)B−L gauge boson and ordinary matter are obtained for a range of DM masses. While our constraints are less stringent than those derived from previous experiments, this study demonstrates the applicability of our method to the lower-mass vector DM search, which is made difficult in this measurement by the short observation time compared to the auto-correlation time scale of DM

Acquisition of technology in an emerging industry: A study of the intelligent vehicle highway system industry.

A critical decision a firm makes in order to participate in an emerging industry is about the manner by which it will develop new product technology. A firm has the choice of developing product technology through internal R&D or through interfirm arrangements such as acquisition of other firms, joint ventures, minority equity ventures, non-equity ventures and licensing. Product technology in emerging industry is characterized by uncertainty, functional and physical compatibility concerns and variations in user attributes. This research contends that characteristics of product technology place unique demands on the firm and influence the manner by which it acquires the product technology. Transaction cost economics, theories of technology development and competitive strategy are used to develop a conceptual framework that associates attributes of emerging technologies to the manner by which firms develop new products. The Intelligent Vehicle Highway Systems (IVHS/ITS) industry is the context for this longitudinal study. Contingency table analysis and logistic regression are the statistical methods used to test the hypotheses. It is expected that uncertainty is likely to have a U-shaped relationship with internal R&D with fewer firms acquiring technology through internal R&D as uncertainty increases. However, when uncertainty is very large, internal R&D is likely to be the method of technology development preferred by firms. Internal R&D is likely to be favored when there are single functional standards while external arrangements are preferred in other regimes of functional standards. Greater physical compatibility requirements are expected to promote internal R&D. When users require specialized investments, firms are likely to develop the technology internally. The study finds significant support for the hypotheses indicating that attributes of technology in an emerging industry influence the method of technology development used by firms in that industry. Implications for the trucking industry and global technology development are included in the study. The results emphasize the importance of understanding the attributes of a product's technology in order to successfully compete in an emerging industry.Ph.D.ManagementSocial SciencesTransportationUniversity of Michigan, Horace H. Rackham School of Graduate Studieshttp://deepblue.lib.umich.edu/bitstream/2027.42/130080/2/9712048.pd