GraphScope Flex: LEGO-like Graph Computing Stack

Graph computing has become increasingly crucial in processing large-scale graph data, with numerous systems developed for this purpose. Two years ago, we introduced GraphScope as a system addressing a wide array of graph computing needs, including graph traversal, analytics, and learning in one system. Since its inception, GraphScope has achieved significant technological advancements and gained widespread adoption across various industries. However, one key lesson from this journey has been understanding the limitations of a "one-size-fits-all" approach, especially when dealing with the diversity of programming interfaces, applications, and data storage formats in graph computing. In response to these challenges, we present GraphScope Flex, the next iteration of GraphScope. GraphScope Flex is designed to be both resource-efficient and cost-effective, while also providing flexibility and user-friendliness through its LEGO-like modularity. This paper explores the architectural innovations and fundamental design principles of GraphScope Flex, all of which are direct outcomes of the lessons learned during our ongoing development process. We validate the adaptability and efficiency of GraphScope Flex with extensive evaluations on synthetic and real-world datasets. The results show that GraphScope Flex achieves 2.4X throughput and up to 55.7X speedup over other systems on the LDBC Social Network and Graphalytics benchmarks, respectively. Furthermore, GraphScope Flex accomplishes up to a 2,400X performance gain in real-world applications, demonstrating its proficiency across a wide range of graph computing scenarios with increased effectiveness

Molecular Dynamics Simulation on the Diffusion of Flavor, O2 and H2O Molecules in LDPE Film

The diffusion of five flavor organic molecules, including D-limonene, myrcene, ethyl hexanoate, 2-nonanone, and linalool in low density polyethylene (LDPE) film were investigated by combined experimental and molecular dynamics (MD) simulation studies. The diffusion coefficients derived from the prediction model, experimental determination, and MD simulation were compared, and the related microscopic diffusion mechanism was investigated. The effects of the presence of the flavor organic molecules on the diffusion of O2 and H2O in polyethylene (PE) were also studied by MD simulation. Results show that: The diffusion of five flavor molecules in LDPE is well followed to Fick’s second law by the immersion experiment; MD simulation indicates the dual mode diffusion mechanism of the flavor molecules is in LDPE; the diffusion coefficients from MD simulation are close to those from the experimental determination, but are slightly larger than those values; the presence of the flavor organic molecules hinders the diffusion of O2 and H2O, which can be well explained from the fraction of free volume (FFV) and interaction energy calculation results derived from MD simulation

A One ppm NDIR Methane Gas Sensor with Single Frequency Filter Denoising Algorithm

A non-dispersive infrared (NDIR) methane gas sensor prototype has achieved a minimum detection limit of 1 parts per million by volume (ppm). The central idea of the design of the sensor is to decrease the detection limit by increasing the signal to noise ratio (SNR) of the system. In order to decrease the noise level, a single frequency filter algorithm based on fast Fourier transform (FFT) is adopted for signal processing. Through simulation and experiment, it is found that the full width at half maximum (FWHM) of the filter narrows with the extension of sampling period and the increase of lamp modulation frequency, and at some optimum sampling period and modulation frequency, the filtered signal maintains a noise to signal ratio of below 1/10,000. The sensor prototype provides the key techniques for a hand-held methane detector that has a low cost and a high resolution. Such a detector may facilitate the detection of leakage of city natural gas pipelines buried underground, the monitoring of landfill gas, the monitoring of air quality and so on

On the genus Polypedilum, subgenus Collartomyia, with description of P. (Col.) baishanzuensis sp. nov. from Baishanzu Nature Reserve, China (Diptera, Chironomidae)

A new species of the genus Polypedilum Kieffer, 1912 is described from Baishanzu Nature Reserve, China, based on molecular and morphological data. Molecular phylogenetic analysis based on standard barcode sequences confirmed a new clade of Polypedilum (Collartomyia) species. The new species is easily distinguished from its congeners by a combination of the following morphological characters: membrane of wing with a large spot occupying 70% of the proximal area; tergite without dark brown band pigmentation; tarsi I–V dark brown; superior volsella with three outer lateral setae and six long setae along inner base; inferior volsella with setose tubercules. An updated key to adult males of the subgenus Collartomyia is also provided

Neoperla anjiensis Yang & Yang 1998

<i>Neoperla anjiensis</i> Yang & Yang, 1998 <p>(Figs. 26–31)</p> <p> <i>Neoperla anjiensis</i> Yang & Yang 1998: 43; Li, Liang & Li 2013: 354.</p> <p> <i>Neoperla yangae</i> Du, 2001 in Wu & Pan 2001: 79. (syn. fide Li <i>et al.</i> 2013).</p> <p> <b>Material examined:</b> 5♂♂ (ICYZU), China, Anhui Province, Huangshan City, Mt. Huangshan, “the Valley of Wild Monkeys”, 597m, 30°5′11.508″N, 118°8′29.7816″E, 2020– VI –2, leg. Yu Lei.</p> <p> <b>Diagnosis:</b> The aedeagus agrees well with the original illustration in Du <i>et al.</i> (2001) (Li <i>et al.</i> 2013). Aedeagal tube sclerotized, evenly curved ventrally, with many spines on dorsal surface and a dark bevelled ring proximally. Aedeagal sac shorter than tube (ca. 1/6 tube length), membranous, gradually tapering to a blunt tip and strongly curved ventrally forming nearly a right angle with tube; dorsally covered by dense spines; ventrobasal surface smooth (Figs. 29–30).</p> <p> <b>Distribution:</b> China (Zhejiang and Anhui Provinces) (Fig. 31).</p> <p> <b>Remark:</b> Compared with the individuals in Zhejiang, our materials from Anhui showed differences between individuals including the procces on male tergum 8 with or without an anterior notch, and the hemitergal process sometimes obviously slender. Their aedeagal morphology without visible difference in this study (Fig. 28).</p>Published as part of <i>Huo, Qingbo, Du, Yuzhou, Zhu, Binqing & Yu, Lei, 2021, Notes on Neoperla sinensis Chu, 1928 and Neoperla anjiensis Yang & Yang, 1998 with descriptions of new species of Neoperla from China (Plecoptera: Perlidae), pp. 288-310 in Zootaxa 5004 (2)</i> on page 304, DOI: 10.11646/zootaxa.5004.2.3, <a href="http://zenodo.org/record/5754518">http://zenodo.org/record/5754518</a&gt

Traditional Village research based on culture-landscape genes: a Case of Tujia traditional villages in Shizhu, Chongqing, China

Global urbanization has led to severe damage and even disappearance of traditional villages in large numbers, significantly impacting the diversity of cultural landscapes. To effectively protect and inherit the cultural landscape of traditional villages, this study proposes the “culture-landscape genes” theory and its double-chain model. Taking the traditional Tujia villages in Shizhu County, Chongqing Municipality, China as an example, we identify, extract, correspond, encode, and comprehensively evaluate their culture-landscape genes. Based on the evaluation and analysis results, corresponding protection and development strategies are formulated. The study indicates that: firstly, the identification, extraction, and correlation of genes directly influence the construction of the evaluation system and the assessment of the protection level. Secondly, the comprehensive evaluation system under the double-chain model is more scientific and reasonable compared to the single-gene model of cultural or landscape genes. The culture-landscape genes theory proposed in this study promotes the development of the gene theory of traditional villages, and its double-chain research model effectively supplements the current methods for the protection and sustainable development of traditional villages, demonstrating a wide range of application value

Revision of two species of Sinopotamon Bott, 1967 (Crustacea, Brachyura, Potamidae) endemic to China: a new combination and a new synonym

The systematics of two problematic potamid species, Sinopotamon koatenense (Rathbun, 1904) and Sinopotamon wuyiensis Li, Lin, Cheng & Tang, 1985, both originally described from the Wuyi Mountains are resolved in this study. Sinopotamon koatenense is transferred to the genus Huananpotamon Dai & Ng, 1994, as the new combination Huananpotamon koatenense comb. nov. The new combination differs from its congeners in the form of the carapace, male pleon, male first gonopod, and vulvae. Phylogenetic analyses based on mitochondrial 16S rDNA sequences support the identification of Huananpotamon koatenense comb. nov. and a redescription is also provided. In addition, S. wuyiensis is confirmed as a junior synonym of Sinopotamon fukienense Dai & Chen, 1979 based on morphological similarities and phylogenetic lineages

Notes on Neoperla sinensis Chu, 1928 and Neoperla anjiensis Yang & Yang, 1998 with descriptions of new species of Neoperla from China (Plecoptera: Perlidae)

Huo, Qingbo, Du, Yuzhou, Zhu, Binqing, Yu, Lei (2021): Notes on Neoperla sinensis Chu, 1928 and Neoperla anjiensis Yang & Yang, 1998 with descriptions of new species of Neoperla from China (Plecoptera: Perlidae). Zootaxa 5004 (2): 288-310, DOI: 10.11646/zootaxa.5004.2.

Neoperla pangi Huo, Du & Zhu 2021, sp. nov.

Neoperla pangi Huo, Du & Zhu, sp. nov. (Figs. 21–25, 31) Type material: Holotype: ♂ (ICYZU), China, Anhui Province, Guangde City, Yangtan Town, Jiufang Village, 30.68°N, 119.19°E, 2020–V–2, leg. Pang Zheng-Ping. Paratype: 1♂, (ICYZU), the same location and data as the holotype. Adult habitus: General body color dark brown. Distance between ocelli ca. 1.5X as wide as diameter of one ocellus. Head pale brown to yellowish, with a large dark spot covering ocellar area to the clypeus, but with a paler medial round spot; antennae and palpi dark brown. Pronotum mostly dark brown except posterolateral margins lighter, trapezoidal, with rugosities present. Wings translucent, veins dark brown; legs dark brown except base of femora and middle of tibiae paler. Cerci pale brown (Fig. 21). Male: Forewing length ca. 12.5 mm, hindwing length 10.0 mm, body length 9.5 mm. Abdomen pale brown to yellowish, except the lateral plates and medial terga 5-7 mostly dark brown. Tergum 7 sclerotized, anterior margin bilobate, with a pair of fingerlike procces; posterior margin with a sclerotized, slightly raised, process, bearing few sensilla in a patch. Tergum 8 with a short triangular process, with several ventral spines on apex. Tergum 9 slightly sclerotized. Hemitergites 10 with apical sensilla patch ventrally. Hemitergal processes sclerotized, fingerlike, slightly curved outward (Figs 22–23). Aedeagal tube plump and sclerotized dorsally, curved ventrad, tip hook-like. Aedeagal sac about 1.2X longer than tube, with two rows of dorsal spines that become larger from base to apex, and a wide, distinct ventral band formed of scaled short spines; apex blunt and completely covered by large spines; the U-shaped apical inner sclerite short and with numerous dense teeth (Fig. 24). Female, Egg and Nymph: Unknown. Distribution: China (Anhui Province) (Fig. 31). Etymology: The species name refers to the collector, Mr. Pang Zheng-Ping who provided the materials for this study. Diagnosis: This new species is similar to above two species, but the fingerlike procces on male tergum 7, the aedeagal sac fully covered by large apical spines and sparser ventral spine patches are distinctive. Remark: This species inhabits small streams besides the local villages (Fig. 25). The above species could be considered as members of the montivaga -group. Moreover, the females of N. sinensis and N. huangshana mostly match the Neoperla hoabihnica -complex. Two congeners that share the similar aedeagal morphology, N. pangi and N. tuberculata, may also belong to the same complex.Published as part of Huo, Qingbo, Du, Yuzhou, Zhu, Binqing & Yu, Lei, 2021, Notes on Neoperla sinensis Chu, 1928 and Neoperla anjiensis Yang & Yang, 1998 with descriptions of new species of Neoperla from China (Plecoptera: Perlidae), pp. 288-310 in Zootaxa 5004 (2) on pages 299-300, DOI: 10.11646/zootaxa.5004.2.3, http://zenodo.org/record/575451

A review of Leuctridae (Insecta, Plecoptera) in Wuyi Mountains, China

Wuyi Mountains are located in the northern Oriental Region and the edge of the southern Palaearctic Region. They have a unique geographical location, complex landform and superior climatic conditions, providing a good ecological environment for Leuctridae species. However, due to the damage of some holotypes in the 20th century, limited drawings and lack of colour figures, it is necessary to reorganise and supplement the preserved Leuctridae specimens from Wuyi Mountains.In this study, we found that there are twelve species of Leuctridae recorded in Wuyi Mountains, accounting for about 20% of the recorded species of Leuctridae in China. These records include two genera and five new distribution records species: one species of the genus Paraleuctra Hanson, 1941: Paraleuctra orientalis (Chu 1928) and eleven species of the genus Rhopalopsole Klapálek, 1912, including five new distribution records to Wuyi Mountains: Rhopalopsole fengyangshanensis Yang, Shi & Li, 2009; Rhopalopsole sinensis Yang & Yang, 1993; Rhopalopsole yangdingi Sivec & Harper, 2008; Rhopalopsole flata Yang & Yang, 1995; Rhopalopsole basinigra Yang & Yang, 1995. Now a total of twelve species of Leuctridae have been recorded from Wuyi Mountains, Fujian Province of south-eastern China. In this paper, we also provide a key to the male, new images and some notes of these twelve species, except Rhopalopsole recurvispina (Wu, 1949) and Rhopalopsole spiniplatta (Wu, 1949). We failed to collect these two species and we regard R. recurvispina as a nomen dubium, because there are no distinctive features that can be used to distinguish this species