7,838 research outputs found
Simulation of thermal plant optimization and hydraulic aspects of thermal distribution loops for large campuses
No full textFollowing an introduction, the author describes Texas A&M University and its utilities system. After that, the author presents how to construct simulation models for chilled water and heating hot water distribution systems. The simulation model was used in a $2.3 million Ross Street chilled water pipe replacement project at Texas A&M University. A second project conducted at the University of Texas at San Antonio was used as an example to demonstrate how to identify and design an optimal distribution system by using a simulation model. The author found that the minor losses of these closed loop thermal distribution systems are significantly higher than potable water distribution systems. In the second part of the report, the author presents the latest development of software called the Plant Optimization Program, which can simulate cogeneration plant operation, estimate its operation cost and provide optimized operation suggestions. The author also developed detailed simulation models for a gas turbine and heat recovery steam generator and identified significant potential savings. Finally, the author also used a steam turbine as an example to present a multi-regression method on constructing simulation models by using basic statistics and optimization algorithms. This report presents a survey of the author??s working experience at the Energy Systems Laboratory (ESL) at Texas A&M University during the period of January 2002 through March 2004. The purpose of the above work was to allow the author to become familiar with the practice of engineering. The result is that the author knows how to complete a project from start to finish and understands how both technical and nontechnical aspects of a project need to be considered in order to ensure a quality deliverable and bring a project to successful completion. This report concludes that the objectives of the internship were successfully accomplished and that the requirements for the degree of Degree of Engineering have been satisfied
Microsarimodes Chang et Chen 2019
No full textGenus <i>Microsarimodes</i> Chang et Chen, 2019 <p> <i>Microsarimodes</i> Chang et Chen, 2019 <i>in</i> CHANG <i>et al.</i> 2019: 137. Type species: <i>Microsarimodes tumida</i> Chang et Chen, 2019, by original designation.</p> <p> <i>Eusarimodes</i> Meng, Qin et Wang <i>in</i> ZHANG <i>et al.</i> 2020: 499, syn. n. Type species: <i>Eusarimodes</i> <i>maculosus</i> Che, Zhang et Wang, 2020, by original designation.</p> <p> Notes. <i>Microsarimodes</i> and its single included species (<i>M. tumida</i> in its original description, here corrected to <i>M. tumidus</i>, because the grammatical gender of <i>Microsarimodes</i> is masculine, cf. ICZN (1999), Art. 30.1.4.4) were not treated by ZHANG <i>et al.</i> (2020). The peculiar ventral lobe of the phallobase (narrow basally, but strongly enlarged before apex), the dorsolateral lobes of phallobase being provided with large semicircular processes ventrally covering ventral aedeagal hooks, and the massive styles, without neck, but with a comb before capitulum dorsally, clearly illustrated by both author groups (CHANG <i>et al.</i> 2019, figs 25, 27, 28; ZHANG <i>et al.</i> 2020, figs 224e, 224h, 224i), leave no doubt that the two genera are identical, therefore their subjective synonymy is hereby proposed, resulting in the following new combination:</p>Published as part of <i>Gnezdilov, Vladimir M., 2022, New Synonymies And New Combinations For Chinese Issidae (Hemiptera: Auchenorrhyncha: Fulgoroidea), pp. 45-52 in Acta Zoologica Academiae Scientiarum Hungaricae 68 (1)</i> on page 49, DOI: 10.17109/AZH.68.1.45.2022, <a href="http://zenodo.org/record/7160706">http://zenodo.org/record/7160706</a>
author = {M. Friendly}, title = {A Brief History of Data Visualization},
No full textyear = {2006}, publisher = {Springer-Verlag}, address = {Heidelberg}, booktitle = {Handbook of Computational Statistics: Data Visualization}, volume = {III}, editor = {C. Chen and W. H\&quot;ardle and A Unwin}, pages = {???--???}, note = {(In press)}, © copyright by the author(s
Pinguisoperla yangzhouensis Chen 2018
No full textPinguisoperla yangzhouensis Chen, sp. nov. Figs. 1–4. Diagnosis. As for the genus. Description. Macropterous; body length (excluding antennae and cerci) ca. 10 mm, generally dark (Fig. 1). Dorsal head and thorax of the specimen are covered by cracks of the amber; apices of antennae and wings are not preserved; dorsal abdomen is covered by wings; ventral abdominal tip slightly decayed, whose detailed structure is unclear. Head (Figs. 1, 2): Head inserted in prothorax, dark brown and sub-quadrate except for the dark, bulbous compound eyes; ocelli invisible. Antenna filiform, at least 24-segmented, each segment almost dark except for the paler apices. Maxillary palp four-segmented, two basal segments longest, third segment slightly thinner and shorter, apical segment shortest and thinnest, about half length of the third segment. Labial palp three-segmented, median segment longest, apical segment shortest and thinnest, about 2/3 length of the median segment. Thorax (Figs. 1, 2): Prothorax much narrower than head, but subequal in length; pronotum dark, trapezoidal with acute corners, anterior margin wider than posterior margin. Mesothorax and metathorax unclear, but strongly sclerotized and wider than prothorax. Legs mostly dark; forelegs shortest, hindlegs longest; femur subequal in length with tibia in forelegs and midlegs, but shorter than tibia in hindlegs; tibia ventrally with two subapical spurs; tarsus three-segmented, two basal segments shortest, subequal in size and with conspicuous euplantulae, apical segment slender and with long apical bristles; claws simple and pointed. Wings (Figs. 1, 3): Apex of left forewing lost, estimated length ca. 11 mm. ScP not clear; at least five crossveins present between ScP and the anterior margin. RP originated from basal 1/3 of RA and with three branches. M simple, not forked. Cu forked to CuA and CuP, CuA with four branches; CuP simple; area between M and CuA with six crossveins; area between CuA and CuP with six crossveins. AA1 simple, AA2 forked. Hind wings invisible. Abdomen (Figs. 1, 4): Abdomen dark, near half the length of the body. Sternum 9 darkly sclerotized, posterior margin distinctly extended backwards, median area paler and decayed, unclear, perhaps with specific structures. Paraprocts invisible, not well developed; abdominal tip triangular in shape. Cercus hairy, with about 7 segments; first basal segment strongly sclerotized, enlarged and elongated, curved outward and backward; several subsequent segments still thick but gradually tapering to the hairy apex; each cercal segment subapically fringed with long setae. Type material. Holotype male, an almost complete specimen in a piece of mid-Cretaceous Burmese amber from Kachin, Hukawng Valley (26°20´N, 96°36´E) of northern Myanmar (98.79 ± 0.62 Ma). The holotype is deposited in the Chen Amber Collection (No. CZT-PLE-MA1), Yangzhou, China. Etymology. The species is named after Yangzhou City, where the author has studied and worked for nearly ten years. Syninclusions. Plant remains, including leaves and twigs.Published as part of Chen, Zhi-Teng, 2018, Pinguisoperla, a new fossil genus of Perlidae (Insecta: Plecoptera) from mid-Cretaceous Burmese amber, pp. 596-600 in Zootaxa 4425 (3) on pages 597-598, DOI: 10.11646/zootaxa.4425.3.13, http://zenodo.org/record/127081
Pelmatops tangliangi Chen 2010
No full text<i>Pelmatops tangliangi</i> Chen, 2010 <p>(Figs. 71–74; 92, 99)</p> <p> <i>Pelmatops tangliangi</i> Chen, in Chen et al., 2010:3. Type-locality: Benggang, Menghai, Yunnan, China (HT ♂ IZCAS).</p> <p> <b>Description</b> (supplement to the species description of Chen <i>et al.,</i> 2010). Compound eye smooth and round, with sharp projection at end in male; ommatidia different in size, those located on projection slightly larger (Fig. 92). Occipital protuberance of male flat, rectangular, not clearly delimited from occiput, setae on its posterior margin medium-sized and numerous (Fig. 99).</p> <p> <b>Distribution.</b> China (Yunnan), India, Vietnam.</p> <p> <b>Specimens examined</b>. CHINA: Yunnan: Xishuangbanna 1750m, November 2008, J. Hu & L. Tang, 1 HT ♂ (<b>IZCAS</b>). INDIA: Ranikhet, June 1949, I. M. Newell, 1 PT <i>♂</i> (<b>BPBM</b>); Khasi Hills, Assam, purchased from E. Heyne, 97–82, 1 <i>♂</i>, 1♀ (<b>BMNH,</b> checked by D.L. Hancock, pers. comm.). VIETNAM: Vinh Phu Prov.: Tam Dao, 500–1000m, 2 June1997, R. Matsumoto, 1 PT <i>♂</i> (<b>OMNH</b>); Tam Dao, 1200m, 13–14 May 2012, Eduard Jendek, 2 <i>♂</i> (<b>CNC</b>, examined by photos and videos, which taken by Eduard Jendek and sent to the first author).</p> <p> <b>Biology.</b> Eduard Jendek, a Canadian entomologist working in the Ottawa Plant Laboratory, Canadian Food Inspection Agency, observed and took photos (Figs. 71–74) and videos of this species in Vietnam in the summer of 2012. According to him, three of the individuals occurred in a small area (6 square meters) at the side of a jungle trail, close to the margin with an open space. The flies were flying relatively slowly and were cumbersome. The first author visited the type locality of this species in Yunnan, China in autumn of 2012, and found this site to be very similar to the site which was described above for <i>P. ichneumoneus</i> in landscape, vegetation, humidity and temperature.</p>Published as part of <i>Chen, Xiao-Lin, Norrbom, Allen, Freidberg, Amnon, Chesters, Douglas, Islam, Md Sajedul & Zhu, Chao-Dong, 2015, A systematic study of Ichneumonosoma de Meijere, Pelmatops Enderlein Pseudopelmatops Shiraki and Soita Walker (Diptera: Tephritidae), pp. 301-347 in Zootaxa 4013 (3)</i> on page 321, DOI: 10.11646/zootaxa.4013.3.1, <a href="http://zenodo.org/record/254396">http://zenodo.org/record/254396</a>
Compositional polarity of Triassic granitoids in the Qinling Orogen, China: implication for termination of the northernmost paleo-Tethys
No full textAbstract not availableNuo Li, Yan-Jing Chen, M. Santosh, Franco Pirajn
Effect of high resistive barrier on earthing system
No full textSubstation earthing provides a low impedance path and carries current into ground under normal and fault conditions without adversely affecting continuity of service. Under a fault condition, the ground voltage may rise to a level that may endanger the public outside the vicinity of the substation. In such a case a high resistive barrier can be inserted around the vicinity of the substation to reduce the surface potentials immediately beyond the barrier. In this paper the effect of barrier on the overall performance of the earthing system has been investigated experimentally and computationally based on an earthing system consisted of combined grid and rods in a water tank. The effect of the position and depth of the barrier to the resistance of the earthing system and surface potentials in and around the substation have been examined
Intern Experience at MEL, Inc.: An Internship Report
No full textIncludes author's vita"Submitted to the College of Engineering of Texas A&M University in partial
fulfillment of the requirement for the degree of Doctor of Engineering."Includes bibliographical references (leaves 82-85)...The author spent a one-year internship at MEL, Inc., a civil and
mechanical engineering consulting firm located in Baton Rouge, Louisiana. By special
arrangement with the president of the firm, the author was able to participate in roles at
various levels within the firm. These activities included engineering design, supervision and
management, project cost control, and interface with top level management. During this period,
the author has been engaged in the following assignments: 1. Serving as senior project
engineer on the Louisiana Training Institution air conditioning and heating project, 2.
Serving at the review and advisory level for three projects, 3. Studying and implementing
computer aided design and drafting system for MEL, Inc. 4. Developing a projet cost control
system that is interactive with the firm's payroll program. 5. Upgrading the firm's computer
capacity. 6. Performing special assignments from the President, Executive Vice-President,
Manager of Operation and Manager of Business and Fiscal Affairs at MEL, Inc. These activities
involved the application of scientific principles to the design, installation, and improvement
of integrated systems of people, materials, and equipment to provide the most effective
operating and work procedures. As a result of this involvement in a wide range of assignments,
the author now has a broadly based experience in a consulting engineering firm as both
engineer and manager. The author also found that well-developed, practical courses in
communication, business, engineering, law, and management from the Doctor of Engineering
program at Texas A&M University contributed greatly to this successful internship with
MEL, Incorporated
Largusoperla dewalti Chen 2018
No full textLargUSoperla dewaltI Chen, sp. nov. Figs. 1–4. Description. Macropterous; body length (excluding antennae and cerci) ca. 9.1 mm, generally brown (Figs. 1, 2). Head (Figs. 1–3): Head oblate, mostly covered with a dark stigma, compound eyes dark. Antennae hairy and dark brown, with at least 29 segments. Maxillary palps not preserved; labial palps three-segmented, basal segment thickest. Pronotum (Fig. 3): Pronotum nearly trapezoidal, rugose and mostly brown, much narrower than head, anterior margin wider than posterior margin, median area not visible. Meso- and metathorax sclerotized, nearly as wide as pronotum. Legs mostly dark brown except for the pale joints; tibia with several thick ventral spines, the paired tibial spurs present; first two tarsal segments shortest with conspicuous euplantulae; apex of the claw dark sclerotized. Wings (Figs. 1–2): Wings hyaline, veins dark brown. Left forewing: length ca. 11.0 mm; ScP about threefourth of forewing length, reaching ScP+RA beyond ra-rp; apical area between anterior margin and RA with one crossvein; about nine crossveins present between ScP and the anterior margin; RP originated from about one-third of RA and with three branches; M forked at near half of the wing length; ra-rp not connected with the opposite crossvein rp-ma; CuA forked basal to the fork of M, with three branches; CuP simple; area between M and CuA with six crossveins; area between CuA and CuP with five crossveins; AA1 simple, AA2 forked. Hind wings covered by forewings, veins not visible. Abdomen (Fig. 4): Abdomen approximately ½ length of the body, generally brown, laterally with dark marks; sterna 6-8 with a pale oval mark; posterolateral margins of each segment slightly extruded. Sternum 9 strongly extended backwards, posteromedially with an elliptical hammer. Paraproct thick, hairy and finger-shaped, unevenly sclerotized with a banded pattern, apex rounded. Cerci hairy and pale,10-segmented, each segment with several dark apical bristles. Type material. Holotype male, No. CZT-PLE-MA3. This specimen is relatively well preserved except for the apex of the antennae, forelegs and right mid-leg, and the maxillary palps. The dorsal aspect of abdomen is not clear; wings are overlapping with only the left forewing clearly visible. Etymology. The new species is named in honor of Dr. R. Edward DeWalt, Illinois Natural History Survey, Champaign, Illinois, USA for his enthusiasm for the study of the Plecoptera and for his generous assistance to the author. Syninclusions. Plant remains and unknown organisms. Remarks. The new species exhibits typical head pattern, body color, similar wing venation and terminalia structures of other known species of Largusoperla but L. dewalti is easily distinguished by the finger-shaped and banded paraprocts.Published as part of Chen, Zhi-Teng, 2018, Key to the fossil genus Largusoperla (Plecoptera: Perlidae), with description of two new species from mid-Cretaceous Burmese amber, pp. 495-500 in Zootaxa 4450 (4) on page 496, DOI: 10.11646/zootaxa.4450.4.8, http://zenodo.org/record/144498
An Economic Approach for Domino Effect Management
No full textIn light of possible severe consequences of unintentional and intentional domino effects, an integrated domino effect management framework was introduced in Chap. 5 to prevent and mitigate domino effect risk. In this chapter, an economic approach based on safety economics is developed to obtain the optimal protection strategy. First, we introduce the concepts and approaches used in safety economics (Chen et al. in Saf Sci 14, 2021). Then, a domino effect management approach is developed based on cost–benefit analysis and game theory (Chen et al. in Process Saf Environ Prot 134:392–405, 2020). In this approach, the disproportion factor (DF) is employed in the cost–benefit analysis to determine whether a protection strategy is recommended. Besides, an optimization algorithm called “PROTOPT” is developed to achieve the optimal protection strategy.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Safety and Security Scienc
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