6,470 research outputs found
Palaealeurodicus wallaceus Martin 2008, comb. nov.
No full text<i>Palaealeurodicus wallaceus</i> (Martin) comb. nov. <p>(Fig. 82)</p> <p> <i>Aleurodicus wallaceus</i> Martin, 1988: 59. Holotype puparium, Sulawesi [BMNH, examined].</p> <p>DISTRIBUTION. Austro-oriental Region – Brunei, Sarawak, Sulawesi.</p> <p> MATERIAL EXAMINED (all BMNH). Holotype puparium and 30 paratype puparia, Indonesia, Sulawesi Utara, Danau Mooat, near Kotamobagu, on <i>Persea americana</i> (Lauraceae), 23.iii.1985 (Martin); puparia & third-instar nymphs, Brunei, Belait District, Penanjong army base, on undetermined host, 03.iii.1989 (Martin); 1 puparium, East Malaysia, Sarawak, Gunung Mulu National Park, Long Pala base camp, on Annonaceae, 27.vi.1978 (Eastop).</p> <p> COMMENTS. <i>P. wallaceus</i> was originally discovered feeding on an avocado tree in Sulawesi. Although avocado is a neotropical plant introduced into Asia, this whitefly is immediately recognisable as a member of the old-world group of species that were then accommodated in <i>Aleurodicus</i>. A single puparium was collected in Sarawak as part of the Royal Geographical Society’s expedition to Gunung Mulu (1977-1978), and the author has since also collected material in Brunei.</p> <p> This species differs from <i>P. holmesii</i> principally in the characteristics of the marginal teeth, and may also be distinguished from the other species of <i>Palaealeurodicus</i> by use of the key, pp. 46, 47.</p>Published as part of <i>Martin, Jon H., 2008, A revision of Aleurodicus Douglas (Sternorrhyncha, Aleyrodidae), with two new genera proposed for palaeotropical natives and an identification guide to world genera of Aleurodicinae, pp. 1-100 in Zootaxa 1835 (1)</i> on page 51, DOI: 10.11646/zootaxa.1835.1.1, <a href="http://zenodo.org/record/5127230">http://zenodo.org/record/5127230</a>
Ambulatory assessment of human body kinematics and kinetics
No full textTraditional human movement analysis systems consist of an optical position measurement system with one or more 6D force plates mounted in a laboratory. Although clinically accepted as `the golden standard' for the assessment of human movement, the restriction to a laboratory environment with its limited measurement volume prevents these systems to be used in an ambulatory environment. To overcome this limitation, this thesis proposes two measurement systems. First, an instrumented shoe is proposed that is used to assess the 3D ground reaction force, the center of pressure trajectory, the center of mass trajectory, and the movement of the foot. The instrumented shoe consists of an orthopedic sandal with two 6D force/moment sensors beneath the heel and the forefoot, and two inertial sensors rigidly attached to the force/moment sensors. Second, a measurement system is proposed which fuses inertial and magnetic sensing to estimate relative positions and orientations on the human body. Fusion is achieved using a realtime Extended Kalman Filter (EKF) with a tightly coupled structure. Change of position and orientation is predicted by integration of acceleration and angular velocity measured by an inertial sensor. Magnetic updates are used to reduce the inherent integration drift due to noise and a fluctuating offset. To minimize energy consumption, the magnetic system only actuates if the uncertainty associated with the position and orientation exceeds a predefined threshold. Moreover, only the coil delivering most information for the reduction of the uncertainty is actuated
Martin Luther King Fellows In Black Religious Studies, Inc. Collection
No full textWhen Martin Luther King, Jr. was assassinated in April of 1968, the Black theological students at Colgate Rochester Divinity School requested a program and professorship in Black Church Studies as a memorial to what King represented as a pastor and leader of the Black Church. After a forced close-down of the school by the Black students and a series of fundraising efforts, the Martin Luther King, Jr. Memorial Professorship in Black Church Studies was established. This position was filled by Henry H. Mitchell (clergyman, educator, author and at that time pastor of Calvary Baptist Church, Santa Monica, CA) on July 1, 1969 and the program of Black Church Studies at CRDS/BH/CTS was launched in September 1969. The Martin Luther King, Jr. Fellows project began as the result of an idea given to Dr. Mitchell for a research and writing project for the purpose of developing literature, curriculum, and bibliographical materials in the area of Black Church practice.
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Modeling the surface topography dependence of friction, adhesion, and contact compliance
No full textThe small-scale topography of surfaces critically affects the contact area of solids and thus
the forces acting between them. Although this has long been known, only recent advances
made it possible to reliably model interfacial forces and related quantities for surfaces with
multiscale roughness. This article sketches both recent and traditional approaches to their
mechanics, while addressing the relevance of nonlinearity and nonlocality arising in soft- and
hard-matter contacts
Aleurodicus talamancensis Martin 2005
No full textAleurodicus talamancensis Martin (Figs 19, 20, 34–36, 132) Aleurodicus talamancensis Martin, 2005: 3. Holotype puparium, Costa Rica [BMNH, examined]. Redescription, based on reappraisal of species limits As originally defined, this species included material that is here described as a distinct species, A. chirripoensis (p. 23). The descriptions of A. chirripoensis and another new species, A. darienpalmae (p. 26), are based on comparison with A. talamancensis and, accordingly, the description of A. talamancensis is reproduced here, slightly modified to include data not available at the time of original description. PUPARIUM. Margin. Outline broadly ovoid, 1.05–1.25 mm long, 0.75–0.91 mm wide, generally widest at abdominal segment II/III (n=25), but specimens of only 0.90 mm long have been examined subsequent to original description. Margin usually apparently irregular as a result of protuberant submarginal pores viewed in profile, sometimes broadly lobulate when completely flattened, with 4–7 shallow lobules per 0.1 mm of abdominal margin. Dorsum. Cuticle often brownish and distinctly paler in submedian area and inner subdorsum (Figs 19, 132). Longitudinal moulting suture reaching puparial margin; transverse moulting sutures distally curving abruptly anteriad, becoming almost tangential to puparial margin and terminating opposite middle legs (Fig. 35). Cuticle of submedian area somewhat corrugate, becoming subtly reticulate subdorsally and then more rugose towards submargin. Abdominal segmentation marked by folds most of which are suture-like submedially but still evident in subdorsum; segment VI/VII boundary sometimes medially only marked by presence of pockets, and not by any fold; median length of segment VII extremely reduced, only 7 segments discernible medially. Submedian abdominal depressions narrow and elongate, usually little more than widenings of intersegmental divisions. Cephalothoracic segmentation only subtly marked. Abdominal segments VII and VIII each bearing an ovoid raised area (Fig. 34) that is lateral to vasiform orifice on segment VII and posterolateral to vasiform orifice on segment VIII; raised areas on segment VIII forming caudal furrow, within which lies excluded part of lingula. Vasiform orifice (Figs 34) broadly cordate, a little wider than long, its rim smooth laterally, situated about its own length from posterior margin of puparium; operculum wider than long, laterally rounded, its anterior edge straight but posterior edge distinctly emarginate where it overlies lingula, opercular surface somewhat rugose-punctate, apparently without a posterior pair of setae; lingula head spinules loosely clustered, rather than covering surface evenly; lingula protruding beyond vasiform orifice, almost as wide as operculum at point of its emergence from under operculum, apically rounded, laterally emarginate in type series (but less so in coconut-feeding material from Ecuador – see Material Examined), its two pairs of setae situated close to apex, distal setal pair stouter and longer than proximal pair, lingular apex closely approaching puparial margin. Chaetotaxy. Posterior marginal setae, 12 pairs of outer submarginal setae (including nominal caudal pair), and single pairs of submedian pro-, meso- and metathoracic setae present, each long and hair-like; eighth abdominal setae present but much shorter and finer, situated anterior to vasiform orifice (Fig. 34). Pores. Cephalic pair and anterior 4 pairs of abdominal compound pores (situated on segments III–VI) presenting laterally to viewer, 35 µ maximum diameter in holotype, each with an axial process protruding beyond pore rim, apically acute when not damaged; a pair of much smaller compound pores, about 16–20 µ in maximum diameter, present on each of abdominal segments VII & VIII, each located on outer edge of its segment’s raised area (Fig. 34). Narrow submargin defined by band of crowded, wide-rimmed pores that stand proud from puparial surface, inner boundary of zone confluent with row of submarginal setal bases, pore band not interrupted at posterior extremity of puparium but often difficult to see there because of marginal down-curling; when margin completely flattened on slide, extreme outer submargin can be seen to be devoid of pores (Fig. 36). Dorsal disc with scattered bright pores, most slightly larger than those of submarginal band, usually 2–3 present in vicinity of each large compound pore, and 3–6 on each raised area of abdominal segments VII & VIII (Fig. 34). Venter. Ventral characters typical for Aleurodicus. MATERIAL EXAMINED. Type material from Musa as detailed in description, Costa Rica (BMNH, InBIO, USNM); non-type material – several samples, various dates and collectors: Colombia, on Anthurium sp. (USNM); Costa Rica, on Cocos nucifera, Ficus sp. and? Maxillaria sp. (BMNH, USNM); Ecuador, on Cocos nucifera and unidentified orchids (BMNH, USNM); Nicaragua, on palm (USNM); Panamá, on Cocos nucifera, cultivated variety of Musa and an unidentified palm (BMNH, USNM). DISTRIBUTION. Neotropical Region – Colombia, Costa Rica, Ecuador, Nicaragua, Panamá (including Canal Zone). COMMENTS. In 2005, severe damage to banana plantations in Costa Rica was reported, caused by enormous populations of this species of Aleurodicus. A. talamancensis was described by Martin (2005), based upon extensive material from bananas, and one sample from? Maxillaria sp., all the material from Costa Rica. Collecting by the author in Ecuador, and material kindly loaned to the author for the present study (courtesy of USNM), has revealed more material of A. talamancensis from several, mostly monocotyledonous, hosts and from other countries (see above). The additional material has indicated that the sample from? Maxillaria is a distinct species, here described (p. 23) as A. chirripoensis. Two BMNH specimens from a palm in Darién Province, Panamá, are clearly closely related to A. talamancensis, although the mesal boundary of the submarginal wide-rimmed pore band is interdigitated with the submarginal setal bases, and these two puparia (and one third-instar nymph) are here described as A. darienpalmae (p. 26).Published as part of Martin, Jon H., 2008, A revision of Aleurodicus Douglas (Sternorrhyncha, Aleyrodidae), with two new genera proposed for palaeotropical natives and an identification guide to world genera of Aleurodicinae, pp. 1-100 in Zootaxa 1835 (1) on pages 43-44, DOI: 10.11646/zootaxa.1835.1.1, http://zenodo.org/record/512723
The Martin Hansen Story by James H. Wood
No full textNotes - Mr. Jim Wood tells the story of his father-in law, Martin Hansen. Mr. Hansen's life begins in Denmark with his birth on February 13, 1888. He talks of his early farming career where he was made a foreman on a neighbour's farm at the age of sixteen. Mr. Hansen arrived in Athabasca on July 3rd, 1913. He shares many anecdotes of his life, including his service in WWI, his homesteading experience and his family life (3 pages
Palaealeurodicus antidesmae Martin 2008, comb. nov.
No full text<i>Palaealeurodicus antidesmae</i> (Corbett) comb. nov. <p>(Fig. 76)</p> <p> <i>Aleurodicus antidesmae</i> Corbett, 1926: 267. Holotype puparium, Sri Lanka [presumed lost].</p> <p>DISTRIBUTION. Oriental Region – Sri Lanka.</p> <p> MATERIAL EXAMINED. 1 first-instar nymph, Ceylon, Pundaluoya, on <i>Antidesma bunius</i> (Euphorbiaceae) (E. E. Green) (BMNH).</p> <p> COMMENTS. This species was described from a solitary specimen but this holotype, collected by E. E. Green and illustrated by Corbett (Fig. 76), has not been present in the BMNH collection for at least 30 years (author’s personal observation). An examination of residual leaf material from the original sample, in the BMNH dry collection, resulted in the discovery of a first-instar crawler which almost certainly belongs to the same species and is now the sole known specimen. As described, with only four abdominal pairs of compound pores, puparia of <i>P. antidesmae</i> should be immediately recognisable if collected again.</p>Published as part of <i>Martin, Jon H., 2008, A revision of Aleurodicus Douglas (Sternorrhyncha, Aleyrodidae), with two new genera proposed for palaeotropical natives and an identification guide to world genera of Aleurodicinae, pp. 1-100 in Zootaxa 1835 (1)</i> on page 47, DOI: 10.11646/zootaxa.1835.1.1, <a href="http://zenodo.org/record/5127230">http://zenodo.org/record/5127230</a>
Assessment of hand kinematics and interactions with the environment
No full textMeasuring hand and finger movements, and interaction forces, is important for the assessment of tasks in daily life. This thesis proposes a new on-body assessment system that allows the measurement of movements and interaction forces of the hand, fingers and thumb. The first thesis objective concerns the development, evaluation and validation of an inertial and magnetic sensing system for the measurement of hand and finger kinematics. The second objective concerns the assessment of the dynamic interaction between human hand and environment using combined force and movement sensing. Chapter 2 describes the inertial and magnetic sensing hardware, and kinematic estimation algorithms for a sensing system which can be attached to the hand, fingers and the thumb. Chapter 3 reports an extensive comparison of this inertial sensing system against a passive opto-electronic marker system under for different tasks that mimic situations in activities of daily living. Chapter 4 describes a new method to ease the typical anatomical segment and sensor calibration procedures by estimating these parameters implicitly along with the estimation of the state variables. In addition, the method incorporates information form chained linkages to circumvent the usage of magnetometers for heading estimation. Chapter 5 presents a solution to estimate the full pose (3D position and 3D orientation) of the hand with respect to the sternum of the body using inertial sensors, magnetometers and a permanent magnet. Contrary to the previous chapters is the magnetic information used to yield a drift free position estimate. Chapter 6 concerns the second research objective which is about the assessment of the physical interaction between the human hand and environmental objects. Dedicated sensors have been applied to measure 3D interaction forces. This hardware has been combined with the inertial hardware presented in the previous chapters and attached to the finger and thumb tips to measure interaction forces and finger motions simultaneously. Eventually the system is used to quantify object dynamics using the information obtained during manipulation
Martin Buber Collection 1897-1980 Bulk dates: 1921-1929
No full textThe Martin Buber Collection holds various papers of this philosopher, with a focus on his work. More than half the collection consists of his letters to Franz Rosenzweig, including a number of them devoted to their collaborative translation of the Bible; lectures he gave at the Freies Jüdisches Lehrhaus in Frankfurt am Main; and a discussion of Buber’s book Ich und Du (I and Thou). In addition the collection holds texts of some of Martin Buber's lectures, photographs, a few letters to others, invitations and an article.The following individuals are mentioned in this collection:Ahren, Yitzhak; Balthasar, H. von; Billigheimer, Samuel; Diamond, Malcolm; Fackenheim, Emil; Farber, Leslie; Fox, Marvin; Friedman, Maurice; Galliner, Arthur; Galliner, Helmut; Gandhi, Mohandas K.; Glatzer, Nahum; Goes, Albrecht; Guggenheim, Siegfried; Heinemann, F.; Hesse, Ninon; Hocking, William Ernst; Hohoff, Curt; Kaplan, Mordechai; Kaufmann, Fritz; Kerenyi, Karl; Klotz, Elena; Kohn, Hans; Kreutzberger, Max; Kuhn, Helmuth; Landauer, Gustav; Levin, Meyer; Levinas, Emmanuel; Loewenberg, Frank; Mailenburg, James; Marcel, Gabriel; Michael, Max; Newman, Louis; Niebuhr, Reinhold; Pfuetze, Paul; Porter, Jack Nusan; Ross, Irvin; Rotenstreich, Nathan; Schneider, Herbert; Scholem, Gershom; Schorsch, Ismar; Sholem, Gershom; Simon, Ernst; Simon, Isidor; Stahr, Adolf; Tagore, Rabindranath; Taubes, Jacob; Weltmann, Lutz; Weltsch, Robert; Wheelwright, Philip; Wilkers, KarldigitizedDigital ImageBorn in Vienna on February 2, 1878, Martin Buber studied philosophy and art history at various European universities, became active in the Zionist movement, and worked as an author, editor, and publisher. Moving to Berlin in 1906, and to Heppenheim near Frankfurt am Main in 1916, he published highly regarded philosophical and theological works. Buber emigrated to Palestine in 1938, where he taught at the Hebrew University in Jerusalem until his death on June 13, 1965.Articles on Martin Buber may be found in ‘Manuscripts about Martin Buber’, MF 189 (available online), and in the Martin Buber Clippings Collection.Photographs removed to Photograph CollectionProcesse
Aleurodicus chirripoensis Martin 2008, sp. nov.
No full textAleurodicus chirripoensis sp. nov. (Figs 17, 18, 37–40, 133) PUPARIUM. Habitus. Developing in distinct groups under leaves, with rather sparse waxy secretions (Fig. 133) limited to a peripheral annulus and a dusting of dorsal meal, with brownish subdorsal bars visible where puparial surface is visible through the meal; broken filaments from the large compound pores visible on the leaf surface. Morphology. Most characters are shared with A. talamancensis (q.v.) and only differences are described below. Outline. 1.37–1.57 mm long, 0.97–1.17 mm wide, generally widest at abdominal segment I/II (n=26). Dorsum. Raised areas on abdominal segments VII and VIII (Fig. 37) broader and less well defined than in A. talamancensis, with caudal furrow therefore less evident; submedian abdominal depressions more distinct, with 2–3 contiguous pits on each side of submedian area (Fig. 39); abdominal segment VI/VII division marked medially by a distinct suture-like fold; cephalic pair and anterior 4 pairs of abdominal compound pores up to 65 µ maximum diameter; rim of vasiform orifice (Fig. 37) a little less sharply defined; operculum almost completely occupying vasiform orifice, surface punctate and with longitudinal and transverse rugae, its posterior edge not conspicuously emarginate, often slightly convex; clusters of surface spinules on lingula head more clearly defined (Fig. 38); largest of the dorsal disc bright simple pores apparently each with a fine transverse septum; usually more simple pores present in vicinity of each compound pore, the most numerous clusters typically on abdominal segment VII and cephalic segment, with up to 10 pores (Figs 37). MATERIAL EXAMINED. Holotype puparium, COSTA RICA, San José Province, Cerro Chirripó, 2600– 2800 metres, on? Maxillaria sp. (Orchidaceae), 17.ii.1983 (J H Martin #3873) (BMNH); Paratypes: 49 puparia (of which 13 on leaf tissue in alcohol), 10 third-instar nymphs, 1 second-instar nymph, same data as holotype (BMNH, INBio, USNM). ETYMOLOGY. This species is named for its collecting locality, the mid-montane slopes of Cerro Chirripó which, at 3820-metres, is the highest mountain peak in Central America. COMMENTS. Many of the observed differences between puparia of A. chirripoensis and A. talamancensis were earlier (Martin, 2005) considered likely to be a result of size variation in A. talamancensis alone, and the material listed above was provisionally determined as A. talamancensis, but was not given paratype status because doubt did remain. However, the size range of the orchid-feeding specimens from Cerro Chirripó does not overlap the size range of all the examined specimens of A. talamancensis, including coconut-feeding material from Ecuador not available at the time of describing A. talamancensis. Along with larger overall puparial size, specimens of A. chirripoensis have their large compound pores almost twice the diameter (up to 65µ) of those in puparia of A. talamancensis (about 30–40 µ), and there are greater numbers of dorsal disc simple pores in the Cerro Chirripó sample; also, the posterior edge of the operculum is markedly emarginate in A. talamancensis, but not so in A. chirripoensis which also has a less clearly defined caudal furrow. These differences are not, now, considered to be merely artifacts of differing physical size and the montane orchidfeeding specimens from Cerro Chirripó are regarded as a distinct species. The author recently described A. niveus and A. rugioperculatus from Belize (Martin, 2004), and these share with chirripoensis the characteristically rugose operculum that occupies most of the vasiform orifice, the robust and often-pigmented puparial cuticle, and the possession of submarginal simple pores of only one type. However, both A. niveus and A. rugioperculatus have a much wider submarginal pore band than do A. talamancensis and A. chirripoensis, and neither A. niveus nor A. rugioperculatus possesses lingular spinules arranged in clusters. A. niveus (like A. chirripoensis an orchid-feeding species) is characterised by its lingular apex being developed into an acute, usually bifid, process, and also by the inner boundary of its very wide submarginal zone of simple pores being concentric with its puparial margin. A. rugioperculatus, from coconut palms and unidentified broad-leaved hosts, has its entire lingula head acute-triangular, and the inner boundary of its submarginal band of simple pores lobe-like.Published as part of Martin, Jon H., 2008, A revision of Aleurodicus Douglas (Sternorrhyncha, Aleyrodidae), with two new genera proposed for palaeotropical natives and an identification guide to world genera of Aleurodicinae, pp. 1-100 in Zootaxa 1835 (1) on pages 23-24, DOI: 10.11646/zootaxa.1835.1.1, http://zenodo.org/record/512723
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