cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Phi4tools: Compilation of Feynman diagrams for Landau-Ginzburg-Wilson theories
Creators: name: Sberveglieri, Giacomo
name: Spada, Gabriele
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Scalar field theories with quartic interactions are of central interest in the study of second-order phase transitions. For three-dimensional theories, numerous studies make use of the fixed-dimensional perturbative computation of [B. Nickel, D. Meiron, and G. Baker Jr, Compilation of 2-pt and 4-pt graphs for continuous spin model, University of Guelph report (1977)], unfortunately left unpublished. We independently verify the results of Nickel et al., and we extend the computation to the eighth order in the coupling constant. The results of our calculations, together with the tools developed, are made available in Phi4tools, a user-friendly package that allows displaying the information about the individual Feynman diagrams, including the numerical values for the diagrams for zero, two, and four-point functions. We also provide the perturbative series up to order eight for the renormalization-group functions for the $O(N)$ and cubic anisotropic models.
description: v2: 30 pages, 6 figures; added figure 2 and section 2.7 plus other minor improvements. Matches published version. The package can be found at https://resources.wolframcloud.com/PacletRepository/resources/GSberveglieri/Phi4tools
CommunityAI: Towards Community-based Federated Learning
Creators: name: Murturi, Ilir
name: Donta, Praveen Kumar
name: Dustdar, Schahram
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: Federated Learning (FL) has emerged as a promising paradigm to train machine learning models collaboratively while preserving data privacy. However, its widespread adoption faces several challenges, including scalability, heterogeneous data and devices, resource constraints, and security concerns. Despite its promise, FL has not been specifically adapted for community domains, primarily due to the wide-ranging differences in data types and context, devices and operational conditions, environmental factors, and stakeholders. In response to these challenges, we present a novel framework for Community-based Federated Learning called CommunityAI. CommunityAI enables participants to be organized into communities based on their shared interests, expertise, or data characteristics. Community participants collectively contribute to training and refining learning models while maintaining data and participant privacy within their respective groups. Within this paper, we discuss the conceptual architecture, system requirements, processes, and future challenges that must be solved. Finally, our goal within this paper is to present our vision regarding enabling a collaborative learning process within various communities.
Monotoma testacea Motschulsky 1845
Creators: name: Jałoszyński, Paweł
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Rhipiphoridae
Monotoma
Monotoma testacea

description: Monotoma (s. str.) testacea Motschulsky, 1845
Egg
(Figs 1–4)
Eggs oval, brown (Figs 1–3), about twice as long as broad, length 418–431 μm, width 205–220 μm (n = 10); chorion with polygonal (mostly hexagonal) sculpture (Fig. 4) composed of dense asperities forming irregular ridges surrounding flat alveolae; the latter covered with much smaller and densely distributed asperities, median group of asperities in each alveola fused and forming an irregular tubercle. Micropyle not found. Most eggs have a small projection on one end (Fig. 3). The projection is on the end that left the female’s oviduct last during egg laying. The hatching larva pushes and separates a broad oval dorsal portion of chorion near the “basal” end (i.e., opposite to the projection), about as long as or slightly longer than 1/3 of egg.
description: Published as part of Jałoszyński, Paweł, 2021, Morphology of immature stages and life cycle of Monotoma testacea Motschulsky (Coleoptera: Monotomidae), pp. 51-83 in Zootaxa 4941 (1) on page 54, DOI: 10.11646/zootaxa.4941.1.3, http://zenodo.org/record/4594680
A scalable narrow linewidth high power laser for barium ion optical qubit
Creators: name: Ahmadi, Morteza
name: Dutta, Tarun
name: Mukherjee, Manas
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Atomic Physics (physics.atom-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The linewidth of a laser plays a pivotal role in ensuring the high fidelity of ion trap quantum processors and optical clocks. As quantum computing endeavors scale up in qubit number, the demand for higher laser power with ultra-narrow linewidth becomes imperative, and leveraging fiber amplifiers emerges as a promising approach to meet these requirements. This study explores the effectiveness of Thulium-doped fiber amplifiers (TDFAs) as a viable solution for addressing optical qubit transitions in trapped barium ion qubits. We demonstrate that by performing high-fidelity gates on the qubit while introducing minimal intensity noise, TDFAs do not significantly broaden the linewidth of the seed lasers. We employed a Voigt fitting scheme in conjunction with a delayed self-heterodyne method to accurately measure the linewidth independently, corroborating our findings through quadrupole spectroscopy with trapped barium ions. Our results show linewidth values of $160 \pm 15$ Hz and $156 \pm 16$ Hz, respectively, using these two methods, underscoring the reliability of our measurement techniques. The slight variation between the two methods can be attributed to factors such as amplified spontaneous emission in the TDFA or the influence of 1/f noise within the heterodyne setup delay line. These contribute to advancing our understanding of laser linewidth control in the context of ion trap quantum computing as well as stretching the availability of narrow linewidth, high-power tunable lasers beyond the C-band.
description: 17 pages, 14 figures
Ducetia japonica
Creators: name: Gupta, Sunil Kumar
name: Chandra, Kailash
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Orthoptera
Tettigoniidae
Ducetia
Ducetia japonica

description: 8. Ducetia japonica (Thunberg)
1815. Locusta japonica Thunberg, Mem. Acad. Sci. St. Petersb. (Sci. Phys.), 5: 282.
1961. Ducetia japonica, Ragge, Bull. Brit. Mus. nat. Hist. (Ent.), 10 (5): 182.
2005. Ducetia japonica, Kulkarni & Shishodia, Fauna of Conservation Area 24: Fauna of Melghat Tiger Reserve, Zool. Surv. India: 321.
Material examined: Chhattisgarh, Raipur, Barnawapara WLS; Devgaon, 16.vii.2011 1(♂, DC); Barnawapara camp,
29.vii.2011, 1(♂,NC) coll. S. K. Gupta & party.
Diagnostic characters: Body size small to medium, colour dark green. Tegmina and wings well developed; tegmina less than 35 mm.in length, posterior radial sector with 4-6 closely parallel branches; cerci with interno-ventral ridge at apex; subgenital plate deeply bifurcate with contiguous lobes and without apical teeth.
Distribution: India: Andaman & Nicobar Islands, Arunachal Pradesh, Assam, Bihar, Chhattisgarh, Jammu & Kashmir, Karnataka, Kerala, Madhya Pradesh, Manipur, Maharashtra, Meghalaya, Sikkim, Tamil Nadu and West Bengal. Elsewhere: Bangladesh, China, Hainan, Indo-China, Japan, Java, Myanmar, Nepal, Sri Lanka, Thailand, Tibet and Tonkin.
description: Published as part of Gupta, Sunil Kumar & Chandra, Kailash, 2018, Systematic study of Tettigoniidae (Orthoptera: Insecta) fauna from Chhattisgarh, India, pp. 325-336 in Records of the Zoological Survey of India 118 (4) on pages 329-330, DOI: 10.26515/rzsi/v118/i4/2018/122641, http://zenodo.org/record/10956089
Imbralyx pierrei Z. Q. Song 2021
Creators: name: Song, Zhu-Qiu
name: Li, Shi-Jin
name: Vu, Quang Nam
name: Khang, Nguyen Sinh
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Fabales
Fabaceae
Imbralyx
Imbralyx pierrei

description: 10. Imbralyx pierrei (Gagnep.) Z.Q. Song (2021: 229).
≡ Millettia pierrei Gagnepain (1913: 362).
Type: — CAMBODIA. Kampong Speu province, Mt Srâl, April 1870, L. Pierre 1032 (lectotype: P02141851 image!, designated by Mattapha et al. 2019b: 6; isolectotypes: NY00026405!, P02141852 image!, P02141853 image!, P01050288 image!).
description: Published as part of Song, Zhu-Qiu, Li, Shi-Jin, Vu, Quang Nam & Khang, Nguyen Sinh, 2022, Taxonomic notes on the genus Millettia (Fabaceae: Millettieae) in Vietnam, pp. 169-185 in Phytotaxa 571 (2) on page 182, DOI: 10.11646/phytotaxa.571.2.4, http://zenodo.org/record/7284336
Nonlinear magnetotransport in MoTe${}_2$
Creators: name: Marx, Anna C.
name: Jafari, Homayoun
name: Tekelenburg, Eelco
name: Loi, Maria A.
name: Slawinska, Jagoda
name: Guimaraes, Marcos H. D.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The shape of the Fermi surface influences many physical phenomena in materials and a growing interest in how the spin-dependent properties are related to the fermiology of crystals has surged. Recently, a novel current-dependent nonlinear magnetoresistance effect, known as bilinear magnetoelectric resistance (BMR), has been shown to be not only sensitive to the spin-texture in spin-polarized non-magnetic materials, but also dependent on the convexity of the Fermi surface in topological semimetals. In this paper, we show that the temperature dependence of the BMR signal strongly depends on the crystal axis of the semimetallic MoTe${}_2$. For the a-axis, the amplitude of the signal remains fairly constant, while for the b-axis it reverses sign at about 100 K. We calculate the BMR efficiencies at 10 K to be $χ^{J}_{A} = (100\pm3)$ nm${}^2$T${}^{-1}$A${}^{-1}$ and $χ^{J}_{B} = (-364\pm13)$ nm${}^2$T${}^{-1}$A${}^{-1}$ for the a- and b-axis, respectively, and we find that they are comparable to the efficiencies measured for WTe${}_2$. We use density functional theory calculations to compute the Fermi surfaces of both phases at different energy levels and we observe a change in convexity of the outer-most electron pocket as a function of the Fermi energy. Our results suggest that the BMR signal is mostly dominated by the change in the Fermi surface convexity.
description: 7 pages, 3 figures
Gas-to-soliton transition of attractive bosons on a spherical surface
Creators: name: Tononi, A.
name: Astrakharchik, G. E.
name: Petrov, D. S.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We investigate the ground state properties of $N$ bosons with attractive zero-range interactions characterized by the scattering length $a>0$ and confined to the surface of a sphere of radius $R$. We present the analytic solution of the problem for $N=2$, mean-field analysis for $N\rightarrow \infty$, and exact diffusion Monte-Carlo results for intermediate $N$. For finite $N$, we observe a smooth crossover from the uniform state in the limit $a/R\gg 1$ (weak attraction) to a localized state at small $a/R$ (strong attraction). With increasing $N$ this crossover narrows down to a discontinuous transition from the uniform state to a soliton of size $\sim R/\sqrt{N}$. The two states are separated by an energy barrier, tunneling under which is exponentially suppressed at large $N$. The system behavior is marked by a peculiar competition between space-curvature effects and beyond-mean-field terms, both breaking the scaling invariance of a two-dimensional mean-field theory.
description: 10 pages, 3 figures
Imbralyx leptobotrys var. macrocarpus Z. Q. Song 2021
Creators: name: Song, Zhu-Qiu
name: Li, Shi-Jin
name: Vu, Quang Nam
name: Khang, Nguyen Sinh
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Fabales
Fabaceae
Imbralyx
Imbralyx leptobotrys
Imbralyx leptobotrys var. macrocarpus (p.k. lôc) z.q. song (2021: 228)

description: 9. Imbralyx leptobotrys var. macrocarpus (P.K. Lôc) Z.Q. Song (2021: 228).
≡ Millettia leptobotrya var. macrocarpa P.K. Lôc in Lôc & Vidal (2001: 120).
Type: — VIETNAM. Thanh Hoa, La Han, 3 August 1920, M. Poilane 1701 (holotype: P02141820 image!; isotype: P02141821 image!).
description: Published as part of Song, Zhu-Qiu, Li, Shi-Jin, Vu, Quang Nam & Khang, Nguyen Sinh, 2022, Taxonomic notes on the genus Millettia (Fabaceae: Millettieae) in Vietnam, pp. 169-185 in Phytotaxa 571 (2) on page 182, DOI: 10.11646/phytotaxa.571.2.4, http://zenodo.org/record/7284336
Canthidium (Neocanthidium) impressum Boucomont 1928
Creators: name: Cupello, Mario
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scarabaeidae
Canthidium
Canthidium impressum

description: Canthidium (Neocanthidium) impressum Boucomont, 1928
Canthidium impressum Boucomont, 1928b: 203 [here transferred to the subgenus Neocanthidium]. Type locality: Brazil: Goiás: Mineiros and Jataí, and Minas Gerais: Uberaba (“ Brésil, Goyaz: Jatahy, Mineiro; Minas Geraes: Uberaba”). Type material: Unknown number of syntypes (MNHN). Distribution: Brazil (Martínez & Halffter 1986a; these authors cited the distribution of this species as “ Brasil: Pará ”, which does not agree with the type locality cited by Boucomont (1928b) nor with any other published information).
description: Published as part of Cupello, Mario, 2018, On the types species of the New World dung beetle genus Canthidium Erichson, 1847 (Coleoptera: Scarabaeidae: Scarabaeinae), with an annotated checklist of species, pp. 451-486 in Zootaxa 4388 (4) on page 470, DOI: 10.11646/zootaxa.4388.4.1, http://zenodo.org/record/1189072
Millettia brandisiana Kurz 1873
Creators: name: Song, Zhu-Qiu
name: Li, Shi-Jin
name: Vu, Quang Nam
name: Khang, Nguyen Sinh
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Fabales
Fabaceae
Millettia
Millettia brandisiana

description: 11. Millettia brandisiana Kurz (1873: 69).
Type: — MANMAR. Pegu, Yomah, 28 March 1871, S. Kurz 2538 (lectotype: CAL0000008168 image!, designated by Mattapha et al. 2019a: 179).
Hô (1999) and Mattapha (2020) recorded this species from Vietnam, but Lock & Heald (1994) and Lôc & Vidal (2001) did not include it in the flora of Vietnam. In Câyco Viêtnam: An Illustrated Flora of Vietnam, Hô (1999) described this species with 11 leaflets, and provided a drawing that indicated it with 9 leaflets, both of which are inconsistent with the 15–21 leaftlets per leaf of Millettia brandisiana. Mattapha (2020) did not provide any vouchers from Vietnam. We also did not find any specimens from Vietnam. Thus this species should be excluded from flora of Vietnam. Mattapha et al. (2019a) designated S. Kurz 2538 (CAL0000008168), which bears many flowers and was collected on 28 March 1871, as a lectotype, but the two specimens of S. Kurz 2538 (CAL0000008167 and K000848699) should not be considered as isolectotypes because they bear pods and were collected on 29 January 1871.
description: Published as part of Song, Zhu-Qiu, Li, Shi-Jin, Vu, Quang Nam & Khang, Nguyen Sinh, 2022, Taxonomic notes on the genus Millettia (Fabaceae: Millettieae) in Vietnam, pp. 169-185 in Phytotaxa 571 (2) on page 182, DOI: 10.11646/phytotaxa.571.2.4, http://zenodo.org/record/7284336
Himertula kinneari
Creators: name: Gupta, Sunil Kumar
name: Chandra, Kailash
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Orthoptera
Tettigoniidae
Himertula
Himertula kinneari

description: 9. Himertula kinneari (Uvarov, 1923)
1923. Himerta kinneari Uvarov, J. Bombay nat. Hist. Soc., 29 (3): 661.
2000. Himertula kinneari, Ingrisch & Shishodia, Mitt. Münch. Ent. Ges., 90: 20.
Material examined: Chhattisgarh; Raipur, Barnawapara WLS; Barnawapara camp, 12.vii.2011, 1(♀,NC); Dond Nala, 10.vii.2011, 3(♀,NC); 23.vii.2011, 1(♂); 27.vii.2011, 1(♂); 10.viii.2011, 1(♂); 18.viii.2011, 1(♂); Nakti Pond, 13.vii.2011, 1(♀,NC); Thatghat, 09.viii.2011, 2(♀,DC); Hardi Pathar, 12.viii.2011, 1(♂,DC); Dongpahari, 4.vii.2011, 1(♂,DC); Jhiriya nala, 25.vii.2011, 4(1 ♂, 3 ♀,DC). Kabirdham, Bhoramdev WLS; Chilpi FRH, 25.viii.2011, 1(♀,NC); 26.viii.2011, 1(♂,NC);; Pagvahi village, 1.ix.2011, 1(♂,DC); Turia, 28.viii.2011, 2(♂,DC). Bastar, Jagdalpur range, 30.viii.2011, 1(♀,DC). Koriya, Gurughasidas NP; Sonhut FRH, 01.viii.2011, 1(♂,NC). Durg, Gondli dam, 23.viii.2011, 1(♀,DC); Keshavpur, 06.xi.2014, 3(♂). Korba, Tharpakhra Nala, 25.iii.2014, 1(♂,DC); Devpahari, 25.iii.2014, 1(♂,DC) coll. S. K. Gupta & party.
Diagnostic characters: Last tergite large, narrowly sulcate along the middle, with the hind margin almost straight, very feebly and broadly sinuate, not obtusely excised; cerci with their apices compressed portion straight, forming an obtuse rounded angle with the base; male subgenital plate with the lobes very long, strongly compressed and recurved, female subgenital plate transverse, simply truncate behind. Ovipositor short, strongly recurved; upper margin straight; lower margin regularly curved; disc rugulose.
Distribution: India: Bihar, Chhattisgarh (Bastar, Durg, Kabirdham, Korba, Koriya and Raipur), Gujarat, Himachal Pradesh, Karnataka, Maharashtra, Madhya Pradesh, Rajasthan, Uttar Pradesh and West Bengal. Elsewhere: Bhutan and Nepal.
description: Published as part of Gupta, Sunil Kumar & Chandra, Kailash, 2018, Systematic study of Tettigoniidae (Orthoptera: Insecta) fauna from Chhattisgarh, India, pp. 325-336 in Records of the Zoological Survey of India 118 (4) on page 330, DOI: 10.26515/rzsi/v118/i4/2018/122641, http://zenodo.org/record/10956089
LPR: Large Language Models-Aided Program Reduction
Creators: name: Zhang, Mengxiao
name: Tian, Yongqiang
name: Xu, Zhenyang
name: Dong, Yiwen
name: Tan, Shin Hwei
name: Sun, Chengnian
Publisher: name: arXiv
Year: 2023
Subjects: subject: Programming Languages (cs.PL)
subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Program reduction is a prevalent technique to facilitate compilers' debugging by automatically minimizing bug-triggering programs. Existing program reduction techniques are either generic across languages (e.g., Perses and Vulcan) or specifically customized for one certain language by employing language-specific features, like C-Reduce. However, striking the balance between generality across multiple programming languages and specificity to individual languages in program reduction is yet to be explored. This paper proposes LPR, the first technique utilizing LLMs to perform language-specific program reduction for multiple languages. The core insight is to utilize both the language-generic syntax level program reduction (e.g., Perses) and the language-specific semantic level program transformations learned by LLMs. Alternately, language-generic program reducers efficiently reduce programs into 1-tree-minimality, which is small enough to be manageable for LLMs; LLMs effectively transform programs via the learned semantics to expose new reduction opportunities for the language-generic program reducers to further reduce the programs. Our extensive evaluation on 50 benchmarks across three languages (C, Rust, and JavaScript) has highlighted LPR's practicality and superiority over Vulcan, the state-of-the-art language-generic program reducer. For effectiveness, LPR surpasses Vulcan by producing 24.93%, 4.47%, and 11.71% smaller programs on benchmarks in C, Rust and JavaScript. Moreover, LPR and Vulcan have demonstrated their potential to complement each other. By using Vulcan on LPR's output for C programs, we achieve program sizes comparable to those reduced by C-Reduce. For efficiency, LPR takes 10.77%, 34.88%, 36.96% less time than Vulcan to finish all benchmarks in C, Rust and JavaScript, separately.
description: Accepted by ISSTA'24. This is the preprint version
Canthidium (Neocanthidium) inoptatum Balthasar 1939
Creators: name: Cupello, Mario
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scarabaeidae
Canthidium
Canthidium inoptatum

description: Canthidium (Neocanthidium) inoptatum Balthasar, 1939
Canthidium inoptatum Balthasar, 1939: 130 [here transferred to the subgenus Neocanthidium]. Type locality: Ecuador. Type material: According to Bezděk & Hájek (2012), one female syntype in NMPC—ex Balthasar collection; also, another female syntype in SMFG. Distribution: Ecuador (Martínez & Halffter 1986a).
description: Published as part of Cupello, Mario, 2018, On the types species of the New World dung beetle genus Canthidium Erichson, 1847 (Coleoptera: Scarabaeidae: Scarabaeinae), with an annotated checklist of species, pp. 451-486 in Zootaxa 4388 (4) on page 470, DOI: 10.11646/zootaxa.4388.4.1, http://zenodo.org/record/1189072
Canthidium (Neocanthidium) kelleri Martinez et al. 1964
Creators: name: Cupello, Mario
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scarabaeidae
Canthidium
Canthidium kelleri

description: Canthidium (Neocanthidium) kelleri (Martínez et al., 1964)
Neocanthidium kelleri Martínez et al., 1964: 172 [transferred to Canthidium (Canthidium) by Martínez & Halffter (1986a: 28); here transferred to the subgenus Neocanthidium]. Type locality: Argentina: Misiones: Loreto (“ Loreto, Misiones Province, Argentina ”). Type material: Holotype male (MACN—ex Martínez collection); see full list of paratypes in Martínez et al. (1964: 176). Distribution: Brazil, Paraguay, and Argentina (Martínez & Halffter 1986a).
Dichotomius (Luederwaldtinia) paraguayanus Gandini & Aguilar, 2009: 139, fig. 1 [synonymized by Nunes & Vaz-de-Mello 2013: 416]. Type locality: Paraguay: Concepción: Campo Zanja Moroti (“PARAGUAY: Dpto. Concepción: Zanja Maroti”). Type material: Holotype male (CPGI); see full list of paratypes in Gandini & Aguilar (2009: 139).
description: Published as part of Cupello, Mario, 2018, On the types species of the New World dung beetle genus Canthidium Erichson, 1847 (Coleoptera: Scarabaeidae: Scarabaeinae), with an annotated checklist of species, pp. 451-486 in Zootaxa 4388 (4) on pages 470-471, DOI: 10.11646/zootaxa.4388.4.1, http://zenodo.org/record/1189072
Holochlora indica Kirby 1906
Creators: name: Gupta, Sunil Kumar
name: Chandra, Kailash
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Orthoptera
Tettigoniidae
Holochlora
Holochlora indica

description: 10. Holochlora indica Kirby, 1906
1906. Holochlora indica Kirby, Syn. Cata. Orth.: 430.
2000. Holochlora indica, Barman, State Fauna Series 7: Fauna of Tripura, Zool. Surv. India, (2): 264.
Material examined: Chhattisgarh, Raipur, Barnawapara WLS; Barnawapara camp, 6.ix.2011, 1(♀,NC); Latadadar,
23.ix.2011, 2(1 ♂, 1 ♀,DC); Balamdehi River, 1.x.2011, 1(♀,DC). Surguja, Tamor Pingla WLS; Ramkola,
14.v.2013, 1(♂,DC) coll. S. K. Gupta & party.
Diagnostic characters: Fastigium conically produced with round apex; anterior margin of pronotum concave and posterior margin convex, radius sector-2 arises from middle of wing and bifurcated at its basal third; hind femur with spines on apical half and anterior two pairs bare of spines; male subgenital plate at the region of bifurcation forms a circle, style foot-shaped; circus gradually narrowed and curved at apex; ovipositor curved and serrate at apical region.
Distribution: India: Andaman & Nicobar Islands, Chhattisgarh (Raipur and Surguja), Himachal Pradesh, Karnataka, Manipur, Meghalaya, Mizoram, Orissa, Sikkim, Tamil Nadu, Tripura and West Bengal. Elsewhere: Java and Sri Lanka.
description: Published as part of Gupta, Sunil Kumar & Chandra, Kailash, 2018, Systematic study of Tettigoniidae (Orthoptera: Insecta) fauna from Chhattisgarh, India, pp. 325-336 in Records of the Zoological Survey of India 118 (4) on page 330, DOI: 10.26515/rzsi/v118/i4/2018/122641, http://zenodo.org/record/10956089
Millettia caerulea Baker 1876
Creators: name: Song, Zhu-Qiu
name: Li, Shi-Jin
name: Vu, Quang Nam
name: Khang, Nguyen Sinh
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Fabales
Fabaceae
Millettia
Millettia caerulea

description: 12. Millettia caerulea Baker (1876: 107).
Type: — MYANMAR. Hill at Phanoe, Ataran river, 10 May 1827, Wallich Cat. 5894 (first-step lectotype designated by Dunn 1912: 185, second-step lectotype designated here: K000848730!; isolectotypes: BM012554531!, K001122519!).
Hô (1999) and Mattapha (2020) recorded this species from Vietnam. But Lock & Heald (1994) and Lôc & Vidal (2001) did not include it in the flora of Vietnam, and we also did not find any specimens from Vietnam. In addition, Pérez (2014) conducted a phytochemical and biological evaluation of this species based on the samples from Nui Chua National Park, Vietnam, but we found that it is the misidentification of the species of Antheroporum Gagnepain (1915: 180) according to Fig. 3.1 provided by Pérez (2014: 126). Thus, this species may be excluded from the flora of Vietnam. In addition, the protologue of M. caerulea provided two localities and two collectors (“Ava, at Phanoe, Wallich; Malacca, Maingay ”). Dunn (1912) cited “Lower Burma: ‘Hill at Phanoe, 10.5.1827. Robinia? caerulea, Wall. Cat. 5894’ (type)”, but did not specify a herbarium. There are more than one duplicates of Wallich Cat. 5894, one of which (K000848730) is designated here as the second-step lectotype of the name.
description: Published as part of Song, Zhu-Qiu, Li, Shi-Jin, Vu, Quang Nam & Khang, Nguyen Sinh, 2022, Taxonomic notes on the genus Millettia (Fabaceae: Millettieae) in Vietnam, pp. 169-185 in Phytotaxa 571 (2) on page 182, DOI: 10.11646/phytotaxa.571.2.4, http://zenodo.org/record/7284336
Setting the connection free in the Galilei and Carroll expansions of gravity
Creators: name: Musaeus, Jørgen
name: Obers, Niels A.
name: Oling, Gerben
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We obtain a Palatini-type formulation for the Galilei and Carroll expansions of general relativity, where the connection is promoted to a variable. Known versions of these large and small speed of light expansions are derived from the Einstein-Hilbert action and involve dynamical Newton-Cartan or Carroll geometry, along with additional gauge fields at subleading orders. The corresponding Palatini actions that we obtain in this paper are derived from an appropriate expansion of the Einstein-Palatini action, and the connection variable reduces to the Galilei- or Carroll-adapted connection on shell. In particular, we present the Palatini form for the next-to-leading order Galilean action and recover the known equations of motion. We also compute the leading-order Palatini-type action for the Carrollian case and show that, while it depends on the connection variable, it reduces on shell to the known action of electric Carroll gravity, which only depends on extrinsic curvature.
description: 23+5 pages; v2: minor changes, published version
Khaoyaiana nitens Ingrisch, Senckenbergiana 1990
Creators: name: Gupta, Sunil Kumar
name: Chandra, Kailash
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Orthoptera
Tettigoniidae
Khaoyaiana
Khaoyaiana nitens

description: 11. Khaoyaiana nitens Ingrisch, 1990
1990. Khaoyaiana nitens Ingrisch, Senckenbergiana biologica, 70: 107.
2010. Khaoyaiana nitens, Shishodia et al., Rec. zool. Surv. India, Occ. Paper No. 314: 301.
Material examined: Chhattisgarh, Raipur, Barnawapara WLS; Barbandha Pond, 27.vii.2011,1(♂,DC);Achanakpur, 31.vii.2011, 1(♂,DC); Barnawapara camp, 6.viii.2011, 1(♂,NC); 09.viii.2011, 1(♀,NC); 05.ix.2011, 1(♀,NC); Mohda Forest, 23.ix.2011, 2(1 ♂, 1 ♀,DC); Loridkhar, 24.ix.2011, 3(2 ♂, 1 ♀,DC); Barbandha Pond, 28.ix.2011, 1(♂,DC). Kabirdham, Bhoramdev WLS; Chilpi FRH, 01.ix.2011, 2(1 ♂, 1 ♀,NC). Koriya, Gurughasidas NP; Sonhut FRH, 18.viii.2011, 1(♀,NC). Durg; Gondli dam, 23.viii.2011, 1(♂,DC) coll. S. K. Gupta & party.
Diagnostic characters: Eyes rounded; antennae not surpassing the tegmina. Pronotum more or less straight infront, convex posteriorly; apical tergite convex; supra-anal plate long, tongue shaped; cerci long, symmetrical; subgenital plate long, wide at baso-laterally.
Distribution: India: Chhattisgarh (Durg, Kabirdham, Koriya and Raipur), Manipur, Meghalaya and Mizoram. Elsewhere: Bhutan; Central Thailand and China.
description: Published as part of Gupta, Sunil Kumar & Chandra, Kailash, 2018, Systematic study of Tettigoniidae (Orthoptera: Insecta) fauna from Chhattisgarh, India, pp. 325-336 in Records of the Zoological Survey of India 118 (4) on pages 330-331, DOI: 10.26515/rzsi/v118/i4/2018/122641, http://zenodo.org/record/10956089
Hyperspectral Image Denoising via Spatial-Spectral Recurrent Transformer
Creators: name: Fu, Guanyiman
name: Xiong, Fengchao
name: Lu, Jianfeng
name: Zhou, Jun
name: Zhou, Jiantao
name: Qian, Yuntao
Publisher: name: arXiv
Year: 2024
Subjects: subject: Image and Video Processing (eess.IV)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Hyperspectral images (HSIs) often suffer from noise arising from both intra-imaging mechanisms and environmental factors. Leveraging domain knowledge specific to HSIs, such as global spectral correlation (GSC) and non-local spatial self-similarity (NSS), is crucial for effective denoising. Existing methods tend to independently utilize each of these knowledge components with multiple blocks, overlooking the inherent 3D nature of HSIs where domain knowledge is strongly interlinked, resulting in suboptimal performance. To address this challenge, this paper introduces a spatial-spectral recurrent transformer U-Net (SSRT-UNet) for HSI denoising. The proposed SSRT-UNet integrates NSS and GSC properties within a single SSRT block. This block consists of a spatial branch and a spectral branch. The spectral branch employs a combination of transformer and recurrent neural network to perform recurrent computations across bands, allowing for GSC exploitation beyond a fixed number of bands. Concurrently, the spatial branch encodes NSS for each band by sharing keys and values with the spectral branch under the guidance of GSC. This interaction between the two branches enables the joint utilization of NSS and GSC, avoiding their independent treatment. Experimental results demonstrate that our method outperforms several alternative approaches. The source code will be available at https://github.com/lronkitty/SSRT.
Experimentally implemented dynamic optogenetic optimization of ATPase expression using knowledge-based and Gaussian-process-supported models
Creators: name: Espinel-Ríos, Sebastián
name: Behrendt, Gerrich
name: Bauer, Jasmin
name: Morabito, Bruno
name: Pohlodek, Johannes
name: Schütze, Andrea
name: Findeisen, Rolf
name: Bettenbrock, Katja
name: Klamt, Steffen
Publisher: name: arXiv
Year: 2024
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Optogenetic modulation of adenosine triphosphatase (ATPase) expression represents a novel approach to maximize bioprocess efficiency by leveraging enforced adenosine triphosphate (ATP) turnover. In this study, we experimentally implement a model-based open-loop optimization scheme for optogenetic modulation of the expression of ATPase. Increasing the intracellular concentration of ATPase, and thus the level of ATP turnover, in bioprocesses with product synthesis coupled with ATP generation, can lead to increased product formation and substrate uptake. Previous simulation studies formulated optimal control problems using dynamic constraint-based models to find optimal light inputs in fermentations with optogenetically mediated ATPase expression. However, using these models poses challenges due to resulting bilevel optimizations and complex parameterization. Here, we outline a simplified unsegregated and quasi-unstructured kinetic modeling approach that reduces the number of dynamic states and leads to single-level optimizations. The models can be augmented with Gaussian processes to compensate for model uncertainties. We implement optimal control constrained by knowledge-based and hybrid models for optogenetic ATPase expression in $\textit{Escherichia coli}$ with lactate as the main product. To do so, we genetically engineer $\textit{E. coli}$ to obtain optogenetic expression of ATPase using the CcaS/CcaR system. This represents the first experimental implementation of model-based optimization of ATPase expression in bioprocesses.
description: 24 pages, 5 figures, journal submission
Canthidium (Neocanthidium) kiesenwetteri Harold 1867
Creators: name: Cupello, Mario
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scarabaeidae
Canthidium
Canthidium kiesenwetteri

description: Canthidium (Neocanthidium) kiesenwetteri Harold, 1867
Canthidium kiesenwetteri Harold, 1867a: 26 [transferred to Neocanthidium by Vulcano & Pereira (1967: 591); transferred to Canthidium (Canthidium) by Martínez & Halffter (1986a: 28); here transferred to the subgenus Neocanthidium]. Type locality: Brazil (“ Brasilien ”). Type material: Location of syntypes unknown. Distribution: Brazil (Martínez & Halffter 1986a; misspelled as “ kissenwetteri ”).
description: Published as part of Cupello, Mario, 2018, On the types species of the New World dung beetle genus Canthidium Erichson, 1847 (Coleoptera: Scarabaeidae: Scarabaeinae), with an annotated checklist of species, pp. 451-486 in Zootaxa 4388 (4) on page 471, DOI: 10.11646/zootaxa.4388.4.1, http://zenodo.org/record/1189072
Millettia nigrescens Gagnepain 1913
Creators: name: Song, Zhu-Qiu
name: Li, Shi-Jin
name: Vu, Quang Nam
name: Khang, Nguyen Sinh
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Fabales
Fabaceae
Millettia
Millettia nigrescens

description: 13. Millettia nigrescens Gagnepain (1913: 360).
Type: — CAMBODIA. Preah Vihear, Kompong Soai, February 1876, F. J. Harmand 412 (holotype: P02141829 image!; isotypes: BO-1703789!, K000848785!, P02141830 image!, P02141831 image!).
Hô (1999) recorded this species from Vietnam, but Lôc & Vidal (2001) suggested that it was known only from the types. We did not find any specimens except for the five type specimens from Cambodia. Thus, it was excluded here from the flora of Vietnam. It is a very poorly known species and is characterised by its tree habit, the presence of stipels, 7 leaflets per leaf, leaflets and flowers becoming black when dry, distinct brachyblasts bearing 2–5 flowers, and a standard with basal callosities.
description: Published as part of Song, Zhu-Qiu, Li, Shi-Jin, Vu, Quang Nam & Khang, Nguyen Sinh, 2022, Taxonomic notes on the genus Millettia (Fabaceae: Millettieae) in Vietnam, pp. 169-185 in Phytotaxa 571 (2) on page 182, DOI: 10.11646/phytotaxa.571.2.4, http://zenodo.org/record/7284336
Sybistroma Meigen 1824
Creators: name: Grichanov, Igor Ya.
name: Kazerani, Farzaneh
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Dolichopodidae
Sybistroma

description: Genus Sybistroma Meigen, 1824
Type-species: Dolichopus discipes Germar, 1821 (designation by Westwood, 1840).
Remarks. See Brooks (2005) for generic diagnosis and synonymy. Unfortunately, combining species from different genera with Sybistroma, Brooks (2005: 120) was inaccurate in checking gender endings, using all genders: masculine (eucerus, flavus, inornatus etc.), neuter (lorifer, obscurellum, sphenopterum) and feminine (setosa). The gender of Sybistroma cannot be neuter, as Meigen (1824) proposing a new genus, originally included Sybistroma nodicornis in the genus (a neuter gender of the name is nodicorne). Later only three species were described in this genus with clearly defined gender, all with feminine ending (none with masculine or neuter endings): S. setosa Schiner, 1862, S. americana Schiner, 1868, and S. lenkoranica Negrobov, 1979. We follow here Schiner’s and Negrobov’s proposal, using the feminine gender for all species names.
description: Published as part of Grichanov, Igor Ya. & Kazerani, Farzaneh, 2014, A new species of Sybistroma Meigen (Diptera: Dolichopodidae) from the Middle East with a key to West-Palaearctic species of the genus, pp. 572-582 in Zootaxa 3866 (4) on page 573, DOI: 10.11646/zootaxa.3866.4.7, http://zenodo.org/record/227606
Letana bulbosa Ingrisch, Entomologica Scandinavica 1990
Creators: name: Gupta, Sunil Kumar
name: Chandra, Kailash
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Orthoptera
Tettigoniidae
Letana
Letana bulbosa

description: 12. Letana bulbosa Ingrisch, 1990
1990. Letana bulbosa Ingrisch, Entomologica Scandinavica, 21 (3): 254.
2000. Letana bulbosa, Ingrisch & Shishodia, Mitt. Münch. Ent. Ges., 90: 16.
Material examined: Chhattisgarh, Raipur, Barnawapara WLS; Barnawapara, 16.vii.2011, 1(♂,NC); Barbandha Pond, 28.ix.2011, 1(♂,DC); Achanakpur village, 31.vii.2011, 1(♂,DC); Jashpur, Badalkhol WLS; Bachhram Beat, 25. V.2012, 1(♀,DC); Korea, Gurughasidas NP, Sonhut FRH, 10.v.2012, 1(♂,NC); Beliya Forest, 17.v.2012, 1(♂,DC) coll. S. K. Gupta & party.
Diagnostic characters: Body medium-sized, green. Stridulatory file small, substraight, but slightly curved at base. Ninth tergite rather weakly projecting behind, apex truncate to very slightly concave. Supra-anal plate with lateral margins concave, surface shallowly depressed, apex subtruncate, apico-lateral angles slightly protruding.
Distribution: India: Chhattisgarh (Raipur), Kerala, Karnataka, Pondicherry, Tamil Nadu and West Bengal.
description: Published as part of Gupta, Sunil Kumar & Chandra, Kailash, 2018, Systematic study of Tettigoniidae (Orthoptera: Insecta) fauna from Chhattisgarh, India, pp. 325-336 in Records of the Zoological Survey of India 118 (4) on page 331, DOI: 10.26515/rzsi/v118/i4/2018/122641, http://zenodo.org/record/10956089
Canthidium (Neocanthidium) kraatzi Harold 1867
Creators: name: Cupello, Mario
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scarabaeidae
Canthidium
Canthidium kraatzi

description: Canthidium (Neocanthidium) kraatzi Harold, 1867
Canthidium kraatzi Harold, 1867a: 24 [here transferred to the subgenus Neocanthidium]. Type locality: Brazil (“ Brasilien ”). Type material: Location of syntypes unknown. Distribution: Brazil (Martínez & Halffter 1986a). Canthidium (Neocanthidium) laevigatum Harold, 1867
Canthidium laevigatum Harold, 1867a: 25 [here transferred to the subgenus Neocanthidium]. Type locality: Brazil (“ Brasilien ”). Type material: Location of syntypes unknown. Distribution: Brazil (Martínez & Halffter 1986a).
description: Published as part of Cupello, Mario, 2018, On the types species of the New World dung beetle genus Canthidium Erichson, 1847 (Coleoptera: Scarabaeidae: Scarabaeinae), with an annotated checklist of species, pp. 451-486 in Zootaxa 4388 (4) on page 471, DOI: 10.11646/zootaxa.4388.4.1, http://zenodo.org/record/1189072
Extended $N$-centered ensemble density functional theory of double electronic excitations
Creators: name: Cernatic, Filip
name: Fromager, Emmanuel
Publisher: name: arXiv
Year: 2024
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: A recent work [arXiv:2401.04685] has merged $N$-centered ensembles of neutral and charged electronic ground states with ensembles of neutral ground and excited states, thus providing a general and in-principle exact (so-called extended $N$-centered) ensemble density functional theory of neutral and charged electronic excitations. This formalism made it possible to revisit the concept of density-functional derivative discontinuity, in the particular case of single excitations from the highest occupied Kohn-Sham (KS) molecular orbital, without invoking the usual "asymptotic behavior of the density" argument. In this work, we address a broader class of excitations, with a particular focus on double excitations. An exact implementation of the theory is presented for the two-electron Hubbard dimer model. A thorough comparison of the true physical ground- and excited-state electronic structures with that of the fictitious ensemble density-functional KS system is also presented. Depending on the choice of the density-functional ensemble as well as the asymmetry of the dimer and the correlation strength, an inversion of states can be observed. In some other cases, the strong mixture of KS states within the true physical system makes the assignment "single excitation" or "double excitation" irrelevant.
description: 19 pages, 7 figures
Letana intermedia Ingrisch 1990
Creators: name: Gupta, Sunil Kumar
name: Chandra, Kailash
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Orthoptera
Tettigoniidae
Letana
Letana intermedia

description: 13. Letana intermedia Ingrisch, 1990
1990. Letana intermedia Ingrisch, Ent. Scand., 21 (3): 260.
2005. Letana intermedia: Kulkarni and Shishodia, Fauna of Melghat Tiger Reserve, Conservation area series, 24: 321.
Material examined: Chhattisgarh, Raipur, Barnawapara WLS; Devgaon, 5.viii.2011, 3(1 ♂, 2 ♀,DC); Dond nala, 14.viii.2011, 1(♂,DC); Barnawapara camp, 25.ix.2011, 2(♂,NC). Kabirdham, Bhoramdev WLS; Chilpi FRH, 31.viii.2011, 1(♂,NC). Koriya, Gurughasidas NP; Thitima Pahad, 24.x.2011, 5(♂,DC). Gariyaband, Udanti WLS; Torenga FRH, 26.vi.2014, 1(♀,NC); Ganga Jamuna village, 28.vi.2014, 4(1 ♂, 3 ♀,DC). Raigarh, Gomerda WLS; Lohari Pond, 28.v.2014, 4(1 ♂, 3 ♀,DC) coll. S. K. Gupta & party.
Diagnostic characters: Body size medium; pronotum inflated in male; tegmina surpassing hind knees; radial sector forked (rarely unforked on one side); ninth tergite moderately projecting behind, apex subtruncate; cerci substaright behind basal curvation, with a black, baso internal bump.
Distribution: India: Chhattisgarh (Bilaspur, Kabirdham, Koriya, Gariyaband, Raigarh and Raipur), Delhi and Maharashtra.
description: Published as part of Gupta, Sunil Kumar & Chandra, Kailash, 2018, Systematic study of Tettigoniidae (Orthoptera: Insecta) fauna from Chhattisgarh, India, pp. 325-336 in Records of the Zoological Survey of India 118 (4) on page 331, DOI: 10.26515/rzsi/v118/i4/2018/122641, http://zenodo.org/record/10956089
Asthenara Forster 1869
Creators: name: Reshchikov, Alexey
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Ichneumonidae
Asthenara

description: Asthenara Förster, 1869
Asthenara Foerster, 1869: 208.
Type species: Asthenarus crassifemur Thomson, 1889 [placed by Roman (1910) as a junior subjective synonym of Asthenara socia (Holmgren, 1857)]. Monobasic, included in Asthenarus by Thomson (1889).
Asthenarus Thomson, 1889: 1437. Unjustified emendation.
Diagnosis. Asthenara can be distinguished from all other genera of Pionini by the combination of the following characters: large lower tooth of mandible; short malar space; sharp notaulus; prepectal carina complete, its upper end on front margin of mesopleuron; areolet absent; Cu1 just distad of basal vein very weakly intercepted; transverse basal groove of propodeum not so deep as in other groups of Pionini; first abdominal segment without glymma, with narrow and long petiole.
description: Published as part of Reshchikov, Alexey, 2016, A new species of the genus Asthenara Förster, 1869 (Hymenoptera, Ichneumonidae) from Mexico with identification key, pp. 190-192 in Zootaxa 4154 (2) on page 190, DOI: 10.11646/zootaxa.4154.2.6, http://zenodo.org/record/263065
Canthidium (Neocanthidium) latipleurum Preudhomme de Borre 1886
Creators: name: Cupello, Mario
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scarabaeidae
Canthidium
Canthidium latipleurum

description: Canthidium (Neocanthidium) latipleurum Preudhomme de Borre, 1886
Canthidium latipleurum Predhomme de Borre, 1886: 113 [transferred to Neocanthidium by Vulcano & Pereira (1967: 591); transferred to Canthidium (Canthidium) by Martínez & Halffter (1986a: 28); here transferred to the subgenus Neocanthidium]. Type locality: French Guiana: Cayenne (“Cayenne”). Type material: Unknown number of syntypes (IRSN). Distribution: Venezuela, Guyana, French Guiana, and Brazil (Martínez & Halffter 1986a).
description: Published as part of Cupello, Mario, 2018, On the types species of the New World dung beetle genus Canthidium Erichson, 1847 (Coleoptera: Scarabaeidae: Scarabaeinae), with an annotated checklist of species, pp. 451-486 in Zootaxa 4388 (4) on page 471, DOI: 10.11646/zootaxa.4388.4.1, http://zenodo.org/record/1189072
Microstructured large-area photoconductive terahertz emitters driven at high average power
Creators: name: Khalili, Mohsen
name: Vogel, Tim
name: Wang, Yicheng
name: Mansourzadeh, Samira
name: Singh, Abhishek
name: Winnnerl, Stephan
name: Saraceno, Clara J.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Emitters based on photoconductive materials excited by ultrafast lasers are well established and popular devices for THz generation. However, so far, these emitters, both photoconductive antennas and large area emitters, were mostly explored using driving lasers with moderate average powers (either fiber lasers with up to hundreds of milliwatts or Ti:Sapphire systems up to few watts). In this paper, we explore the use of high power, MHz repetition rate Ytterbium (Yb) based oscillator for THz emission using a microstructured large area photoconductive emitter, consist of semi insulating GaAs with a 10 by 10 mm2 active area. As a driving source, we use a frequency doubled home built high average power ultrafast Yb oscillator, delivering 22 W of average power, 115 fs pulses with 91 MHz repetition rate at a central wavelength of 516 nm. When applying 9 W of average power (after an optical chopper with a duty cycle of 50 percent) on the structure without optimized heatsinking, we obtain 65 uW THz average power, 4 THz bandwidth; furthermore, we safely apply up to 18 W of power on the structure without observing damage. We investigate the impact of excitation power, bias voltage, optical fluence, and their interplay on the emitter performance and explore in detail the sources of thermal load originating from electrical and optical power. Optical power is found to have a more critical impact on LAE saturation than electrical power, thus optimized heatsinking will allow us to improve the conversion efficiency in the near future towards much higher emitter power. This work paves the way towards achieving hundreds of MHz or even GHz repetition rates, high power THz sources based on photoconductive emitters, that are of great interest for example for future THz imaging applications.