494 research outputs found
Correction: Zhang et al. The Impact of Green Financial Policy on the Regional Economic Development Level and AQI—Evidence from Zhejiang Province, China. Sustainability 2023, 15, 4068
No full textRegarding the author correction request, it has been clarified that the original paper was composed by Daping Zhang, Pinzhen Cheng, Minxing Wang, Zhenming Chen and Lufei Huang [...
Early Jurassic rare metals mineralization in Nanling Region: A case of Daping granite porphyry in Southwest Fujian
No full textSouth China is an important region for rare metals' producing in China. Most of the deposits in this region are related to the high-evolution Li-F granites. The Daping granite porphyry is situated in the east edge of Nanling Range in Fujian Province. In this study, SIMS and LA-ICP-MS zircon U-Pb dating results yield ages of 186.7 +/- 1. 2Ma and 190.7 +/- 1. 1Ma for the Daping granite porphyry, which is the first report of Early Jurassic (200 similar to 180Ma) magmatism and Nb-Ta mineralization in this area. Geochemically, they show metaluminous-peraluminous and display typical A-type granite characteristics, such as high SiO2(72. 8% similar to 76. 4%), K2O and Zr + Nb + Ce + Y contents, high 10000Ga/Al, FeOT/MgO ratios and low Zr, Hf, Ba, Sr, Ti and Eu contents. The granite underwent high degree of crystallization differentiation, and it is enriched in Nb2O5 and Ta2O5, which achieved the industrial grades. In-situ zircon epsilon(Hf) (t) values range from - 2. 4 to 3. 4, and their delta O-18 range from 6 parts per thousand to 6. 6 parts per thousand. Based on regional geological data, it is proposed that the Daping granite porphyry is originated from the asthenosphere mantle, with 20% similar to 30% of crustal materials. During the evolution of the granites with enriched rare metals, the contents of F, Rb and Li in the melts increased with the increasing degree of their magmatic evolution. We chose a drill hole (ZK001) as the object of study to understand the enrichment processes of the Nb and Ta in this granite. As the depth of drill hole decreases, the ratios of Nb/Ta, Zr/Hf and Th/U goes down, while the ratio of Rb/Sr goes up, and the concentrations of Nb and Ta gradually increase. The rocks with high Nb and Ta concentrations normally contain high F contents (up to 0. 8%), with high ratios of Y/Ho which also indicates that strong interactions occurred between the fluid and the magma. Late fluorine-rich fluids exsolving from the magmatic melts may play an important role in the concentration and fractionation of the Nb and Ta. In combination with the E-W trending Early Jurassic rock association (OIB-type gabbro and basalt, A-type granite) in the Nanling Range, the Daping granite and Fankeng bimodal volcanics are located along the east extension of the E-W trending rift belt of whom a great dispute has been put forward about its formation. Some people believe that this belt is a product of post-orogenic continental after the Triassic collision of Indochina block and the South China block; while others argue that the subduction of the paleo-Pacific plate played an important role in the formation of this belt. This event just occurred at the time and place in the transition from the Tethys tectonic domain to the paleo-Pacific tectonic domain. Through this study, we can deepen our understanding of regional geological evolution and the formation of this rift belt and its vocalnic rock assemblage
Characteristics of REEs and Trace Elements in Scheelite and Muscovite Ar–Ar Isotopic Dating of the Daping Tungsten Deposit
No full textThe recently discovered Daping tungsten deposit is located about 25 km north of Tongcheng County, Hubei Province, in the northern margin of the Sijiapu granite deposit of the Mufushan composite batholith. The ore body is produced in the northeast-oriented greisenization granite and quartz vein, and belongs to the greisen-vein-type scheelite deposit. The resources of the Daping W deposit have a value of 7935 t W and the average grade is 0.201% WO3. Based on mineralogical and petrographic studies, scheelite is classified into two types. A study of the geochemical characteristics of rare earth elements (REEs) and trace elements indicated that some scheelite specimens showed LREE depletion. Meanwhile, the total amount of scheelite rare earth elements (REEs) is low and the ratio of LREE/HREE ranges from 0.40~2.72 in the Daping W deposit. The contents of REEs and trace elements in the two types of scheelite differ significantly. Type I scheelite has an average ∑REE content of 195.65 ppm, an LREE/HREE value of 0.5, an Eu anomaly (δEu) of 0.78, Mo of 366.20 ppm, Sn of 22.62 ppm, and Sr of 264.80 ppm. However, type II scheelite features an average ∑REE of 111.28 ppm, an LREE/HREE ratio of 1.43, a δEu of 1.56, Mo of 188.48 ppm, Sn of 0.15 ppm, and Sr of 829.93 ppm. The content level of Mo in the two types of scheelite is not high, indicating that this whole metallogenic environment is a reduction environment. However, this is a complex process. The presence of type I scheelite with negative Eu anomalies and relatively high Mo content indicates that the ore-forming environment in the early period of the greisen stage was relatively oxidizing. In contrast, type II scheelite contains large amounts of Sr and large positive Eu anomalies, which are likely to be released from plagioclase in the granite during greisenization. The extremely low composition of Mo in type II scheelite is closely related to the reducing environment in the later period of the greisen stage. Because Mo probably exists in its Mo4+ state, it may be difficult for it to replace W6+ in the scheelite lattice. Additionally, comparing the contents of Sn and Sr in different types of scheelite shows that the metallogenic environment changes from relative oxidation to the reduction of scheelite. The variation in trace elements and REEs in scheelite over time reflects a complex magmatic–hydrothermal mineralization environment. Additionally, the Ar–Ar system dating results for muscovite that is closely associated with scheelite in the greisenization granite vein indicate that a muscovite 40Ar/39Ar plateau age of about 133 Ma represents the time of tungsten mineralization. This muscovite 40Ar/39Ar dating result is close to the previous zircon U-Pb age data of the biotite monzogranite (ca. 140–145 Ma), which is the largest intrusion in the orefield. Meanwhile, the new age data reported here confirm that the Daping tungsten deposit represents a Mesozoic magmatic–hydrothermal mineralization event with a setting of lithospheric extension in the Mufushan composite batholith
Stability monitoring and analysis of submerged landslides in the Three Gorges Reservoir area based on time-series InSAR data and GNSS data
No full textPrecise landslide monitoring is crucial for understanding and mitigating their impact. The Three Gorges Dam has exacerbated landslides due to steep slopes and rising water levels. This study used ALOS-2 PALSAR-2 (2016–2017) and Sentinel-1A (2016–2018) data to monitor the Daping slope. Findings showed deformation rates of −86.3 mm/y (ALOS-2) and −62 mm/y (Sentinel-1A), confirmed by GNSS data. Analysis indicated that rainfall and water level fluctuations drive the Daping landslide, highlighting key factors influencing landslides in the Three Gorges region and their threats to life and property
Crust and mantle contributions to gold-forming process at the Daping deposit, Ailaoshan gold belt, Yunnan, China
No full textTubers of <i>Solanum tuberosum</i> cultivars.
No full text<p>(A) white skin and white flesh tetraploid cultivar ‘Xin Daping’, (B) purple skin and purple flesh tetraploid cultivar ‘Hei Meiren’.</p
HLA-DQB1 expression on tumor cells is a novel favorable prognostic factor for relapse in early-stage lung adenocarcinoma
No full textLiang Zhang,1 Mengxia Li,1 Bo Deng,2 Nan Dai,1 Yan Feng,1 Jinlu Shan,1 Yuxin Yang,1 Chengyi Mao,3 Ping Huang,1 Chengxiong Xu,1 Dong Wang11Cancer Center of Daping Hospital, Third Military Medical University, Chongqing 400042, People’s Republic of China; 2Thoracic Surgery Department of Daping Hospital, Third Military Medical University, Chongqing 400042, People’s Republic of China; 3Pathology Department of Daping Hospital, Third Military Medical University, Chongqing 400042, People’s Republic of ChinaBackground: Postoperative recurrence is the main cause of a poor prognosis in early-stage lung adenocarcinoma (LUAD). Factors that can predict recurrence risk are critically needed.Materials and methods: In this study, we designed a screening procedure based on gene profile data and performed validation using TCGA and Daping hospital’s cohorts. Differentially expressed genes (DEGs) between patients with recurrence-free survival (RFS) 3 years were identified, overlapping genes among these DEGs were selected as candidate biomarkers. A Cox proportional hazards model, immunohistochemistry and Kaplan-Meier survival analysis were performed to validate these biomarkers in two distinct validation sets.Results: SFTPB, SFTPD, SFTA1P, HLA-DQB1, ITGB8, ANLN, and LRRN1 were overlapped both in TCGA and Daping discovery sets. The Cox proportional hazards model analysis of the TCGA validation set showed that HLA-DQB1 was an independent prognostic factor for RFS (HR=0.686, 95% CI, 0.542–0.868). Immunohistochemistry and Kaplan-Meier analysis in Daping validation sets confirmed HLA-DQB1 expression on tumor cells (not interstitial cells) to be an effective predictor of postoperative recurrence. Further examination revealed that the level of HLA-DQB1 expression on tumor cells was positively correlated with CD4- and CD8-positive lymphocyte infiltration into the tumor.Conclusion: All results indicate that high expression of HLA-DQB1 on tumor cells is a good prognostic marker in early-stage LUAD, and the mechanism may be related to anti-tumor immune activity.Keywords: HLA-DQB1, lung adenocarcinoma, tumor recurrence, prognostic factor
 
Notice of Retraction: Application of Fuzzy Recognition in Setting up the Model of the Proportion of the Three Hops in Triple Jump
No full textBoulenophrys puningensis Wang & Zeng & Lyu & Qi & Liu & Chen & Lu & Xiao & Lin & Chen & Wang 2022, sp. nov.
No full textBoulenophrys puningensis sp. nov. Wang, Zeng, Lyu, Xiao & Wang Puning Horned Toad (in English) / Pǔ Níng Jiǎo Chán (DṪDzdz in Chinese) Figures 3–4 Holotype. SYS a005770, adult male, collected by Jian Wang on 24April 2017 from Longkeng Village (23°7'54.07"N, 115°51'5.28"E; ca. 120 m a.s.l.), Daping Town, Puning, Jieyang, Guangdong, China. Paratypes (N=5). Adult male, SYS a006755/ CIB118526, collected by Jian Wang, Can-Rong Lin and Hui-Wen Xiao on 14 February 2018; adult males SYS a007649, 7650 and adult females SYS a007647, 7648, collected by Jian Wang, Can-Rong Lin and Hui-Wen Xiao on 18 March 2019, all from the same stream as the holotype at elevations between 250–300 m. Etymology. The specific epithet “ puningensis ” refers to the type locality of the new species in Puning. Three of the authors of this work (Jian Wang, Hui-Wen Xiao and Can-Rong Lin) chose this nomen in honor of their hometown. Diagnosis. (1) Small body size, SVL 31.7–34.6 mm (33.0 ± 1.3, N = 4) in adult males and SVL 37.8–38.3 mm (N = 2) in adult females; (2) snout rounded in dorsal view; (3) tympanum large, TD/ED 0.68–0.71; (4) tympanic region smooth without granules or tubercles; (5) vomerine ridge and vomerine teeth present; (6) margin of tongue rounded, not notched distally; (7) hindlimbs short, heels not meeting and tibio-tarsal articulation reaching forward to the region between tympanum and eye; (8) a subarticular tubercle present at the base of each fingers; (9) toes without lateral fringes and with rudiment of webbing; (10) distinct enlarged tubercles on the surface of limbs, flanks, chest, belly and around the cloaca; (11) tips of the enlarged tubercles on posterior abdomen, ventral thighs and around the cloaca bearing tiny spines; (12) single subgular vocal sac in males; (13) nuptial pads with villiform black nuptial spines on the dorsal surface of the first and second fingers in breeding males. Comparisons. Comparative data of Boulenophrys puningensis sp. nov. and the other recognized members of Boulenophrys are listed in Table 3. With a smaller body size, SVL 31.7–34.6 mm in adult males and SVL 37.8–38.3 mm in adult females, Boulenophrys puningensis sp. nov. differs from the eight congeners whose SVL ≥ 50 mm in adult males or females, including B. caudoprocta (81.3 mm in a single male), B. jingdongensis (53.0– 56.5 mm in males and 63.5 mm in a single female), B. liboensis (60.5–67.7 mm in males and 60.8–70.6 in females), B. mirabilis (55.8–61.4 mm in males and 68.5–74.8 mm in females), B. omeimontis (56.0– 59.5 mm in males and 68.0– 72.5 mm in females), B. sangzhiensis (54.7 mm in a single male), B. shuichengensis (102.0– 118.3 mm in males and 99.8–115.6 mm in females), and B. spinata (54.0–55.0 mm in females). Boulenophrys puningensis sp. nov. shows the least genetic divergence from B. kuatunensis (mean p -distances 5.3 % in the 16S gene) and B. daiyunensis (mean p -distances 6.2 % in the 16S gene). However, the new species distinctively differs from these species by having relatively shorter shanks with the heels not meeting when the flexed hindlimbs are held at right angles to the body axis (vs. heels meeting or overlapping in B. daiyunensis); having rudiment of webbing and no lateral fringes on toes (vs. lateral fringes narrow in B. daiyunensis; webbing absent in B. kuatunensis); having raised and enlarged tubercles with spines on their tips on surface of posterior abdomen, ventral thighs and around the cloaca (vs. such tubercles not enlarged and without spines in B. daiyunensis; ventral surface smooth in B. kuatunensis). Boulenophrys puningensis sp. nov. is morphologically most similar to B. brachykolos, which is restricted to Hong Kong and Shenzhen, China (Liu et al. 2018). The new species differs from B. brachykolos by having vomerine teeth (vs. absent in B. brachykolos); lacking spines on the surface of the tympanic region (vs. having dense tiny spines on the surface of the tympanic region in B. brachykolos); and having different relative finger length formula (I = II <IV <III in Banophrys puningensis sp. nov. vs. II <IV <I <III in B. brachykolos). In having relatively shorter shanks with heels that do not meet when the flexed hind limbs are held at right angles to the body axis, Boulenophrys puningensis sp. nov. can be easily distinguished from the following 32 congeners, i.e. B. angka, B. anlongensis, B. baishanzuensis, B. baolongensis, B. binchuanensis, B. binlingensis, B. boettgeri, B. congjiangensis, B. cheni, B. chishuiensis, B. jiangi, B. jinggangensis, B. jiulianensis, B. leishanensis, B. lini, B. minor, B. mufumontana, B. nanlingensis, B. palpebralespinosa, B. qianbeiensis, B. sanmingensis, B. shimentaina, B. shunhuangensis, B. tongboensis, B. wuliangshanensis, B. wushanensis, B. xiangnanensis, B. xianjuensis, B. yaoshanensis, B. yangmingensis, B. yingdeensis and B. yunkaiensis, all of which have relatively longer shanks with the heels meeting or overlapping. By the presence of vomerine teeth, Boulenophrys puningensis sp. nov. differs from B. acuta, B. caobangensis, B. daoji, B. huangshanensis, B. lishuiensis, B. lushuiensis, B. obesa, B. ombrophila, B. tuberogranulatus, and B. wugongensis, all of which lack vomerine teeth. By having a rounded tongue margin that is not notched distally, Boulenophrys puningensis sp. nov. differs from B. hoanglienensis, and B. insularis, all of which have notched tongues. By the absence of lateral fringes on toes, Boulenophrys puningensis sp. nov. differs from B. rubrimera, which has narrow lateral fringes on toes. By the presence of rudimentary webbing on the toes, Boulenophrys puningensis sp. nov. differs from B. daweimontis, B. fansipanensis, and B. frigida, all of which lack webbing on the toes. Boulenophrys puningensis sp. nov. further differs from the remaining B. dongguanensis and B. nankunensis by having raised tubercles bearing spines on the surface of the posterior abdomen, ventral thighs, and around the cloaca (vs. absence of such tubercles and spines in B. dongguanensis and B. nankunensis). Description of holotype. Adult male. Body size small, SVL 34.6 mm. Head width slightly larger than head length, HWD/HDL 1.03; snout rounded in dorsal view, projecting, sloping backward to mouth in profile, protruding well beyond margin of lower jaw; top of head flat; eyes moderate in size, ED 0.36 of HDL, pupil vertical, near diamond-shaped; nostril oblique-ovoid; canthus rostralis well developed; loreal region slightly oblique; internasal distance slightly larger than interorbital distance; tympanum large with an obvious margin, TD/ED 0.70; large ovoid choanae at base of maxilla; vomerine ridge and vomerine teeth present, maxillary teeth present; margin of tongue rounded, not notched distally; presence of single subgular vocal sac, and pair of slit-like openings at posterior of jaw. Forearm (i.e., radioulna) length 0.21 of SVL and hand 0.23 of SVL; hand without webbing, fingers without lateral fringes, relative finger length I = II <IV <III; tips of fingers slightly dilated, round; subarticular tubercles present and distinct; inner metacarpal tubercle observably enlarged and outer one slightly smaller; single nuptial pad bearing nuptial spines present on dorsal surface of first and second fingers, respectively. Hindlimbs short, tibiotarsal articulation reaching forward to region between tympanum and eye when hindlimb stretched along body; heels not meeting when flexed hindlimbs held at right angles to body axis; crus (i.e., tibiofibular) length 0.38 of SVL and foot length 0.54 of SVL; relative toe length I <II <V <III <IV; tips of toes round and slightly dilated; toes without lateral fringes and with rudiment of webbing; subarticular present and distinct; inner metatarsal tubercle long ovoid and lacking outer metatarsal tubercle. Dorsal skin rough and granular, with raised conical tubercles; sparse large tubercles on flanks; single horn-like prominent tubercle on edge of upper eyelid; obvious supratympanic fold curving posteroventrally from posterior corner of eye to level above insertion of arm; tympanic region smooth without granules or tubercles; dense tubercles on skin of upper lip, upper eyelid, mandibular articulation, loreal, temporal region excluding tympanum and surface around cloaca; a single discontinuous “V” shaped ridge present on occipital region; dense tubercles on shanks and thighs; ventral surface with dense raised tubercles; tubercles on surface of posterior abdomen, ventral surface of thighs and around cloaca bearing tiny spines on their tips; small pectoral gland closer to axilla; single femoral gland positioned on posterior surface of thigh at midpoint between knee and cloaca. Coloration of holotype in life. Dorsal surface of body yellowish brown, with incomplete dark brown triangular marking between eyes. Two wide oblique black bands present on forearm. Dorsal surface of fingers and hindlimbs with dark grey transverse bands. Presence of vertical dark brown band below eye. Tubercles on edge of upper eyelid beige. Supratympanic fold light brown. Ventral surface dark grey, with black longitudinal band on surface of throat; surface of throat and chest mottled with orange patches. Tubercles on ventral surface of chest, belly, and thighs greyish white; spines on tips of tubercles on surface of posterior abdomen; ventral surface of thighs and around cloaca dark grey. Digits, inner and outer metacarpal tubercles and inner metatarsal tubercle greyish white. Pectoral glands and femoral glands beige, mottled with orange patches. Iris yellowish brown, with greyish white patches on upper and lower margin. Coloration of holotype in preservative. Yellowish brown fades to greyish brown dorsally. Color of the triangular marking between eyes, oblique bands on forearms, patterns on ventral surface faded. Orange patches on surface of throat, chest; color of pectoral glands and femoral glands faded. Variation. Mensural data of the type series are listed in Table 4. Most of the paratypes are similar to the holotype in morphology and color pattern, except for the following: dorsal surface of body yellowish brown in the holotype (vs. dorsal surface of body light brown in the paratypes SYS a007647 (Fig. 4C) and SYS a007648 (Fig. 4E); ventral surface dark grey with orange patches (vs. ventral surface lacking bright patches in the paratypes SYS a007649 (Fig. 4B), SYS a007647 (Fig. 4D) and SYS a007648 (Fig. 4F); iris yellowish brown, with greyish white patches on its upper and lower margin in the holotype (vs. iris grey with beige and dark mottling in the paratype SYS a007649 (Fig. 4A); tubercles on posterior part of abdomen of the paratype SYS a007648 (Fig. 4F) are weakly developed. Females are distinctly larger than the males. Distribution and natural history. Currently, Boulenophrys puningensis sp. nov. is only known from its type locality, Longkeng Village of Puning. It inhabits flowing montane streams and the nearby forest floor and leaf litter at elevations between 120– 300 m. Advertisement calls of males were heard from February until April. Males were found calling in rock crevices in the flowing streams. Tadpoles could be found in this period.Published as part of Wang, Jian, Zeng, Zhao-Chi, Lyu, Zhi-Tong, Qi, Shuo, Liu, Zu-Yao, Chen, Hong-Hui, Lu, Yu-Hong, Xiao, Hui-Wen, Lin, Can-Rong, Chen, Kai & Wang, Ying-Yong, 2022, Description of three new Boulenophrys species from eastern Guangdong, China, emphasizing the urgency of ecological conservation in this region (Anura, Megophryidae), pp. 91-119 in Zootaxa 5099 (1) on pages 102-106, DOI: 10.11646/zootaxa.5099.1.4, http://zenodo.org/record/603696
Fatigue crack growth in ceramics containing a viscous grain boundary phase at elevated temperatures
No full textElevated-temperature crack growth behavior in a commercial Al\sb2O\sb3 and a hot-pressed 30 vol.% TiB\sb2-SiC composite was examined under tensile static loading (static fatigue) and tension-tension cyclic loading (cyclic fatigue). The study was carried out at temperatures of 700-900\sp\circC, where the vitreous grain boundary phase flowed viscously. Experimental results have shown the existence of cyclic fatigue in these materials, but the cyclic effect cannot be seen as the consequence of a static fatigue mechanism, although under both cyclic and static loading conditions crack propagation assumed an intergranular fracture mode. The testing temperature, load ratio, and cyclic frequency were found to exert significant effects on cyclic fatigue-crack growth behavior. A damage zone was observed ahead of the crack tip in which grain boundary cavitation (or microcracking) occurred during fatigue-crack growth. An analytical model based upon the damage accumulation in the grain boundary phase was developed that successfully predicted the frequency and load ratio dependencies of crack growth. Values of activation energy for cyclic and static fatigue crack growth were approximately the same. Fracture mechanisms in both cases were also found to be similar. However, crack growth under static loads was faster than that under cyclic loads at the same maximum stress intensity. Such a difference in the growth rate suggested that the damage accumulation in the grain boundary phase differed during cyclic and static fatigue processes. In the TiB\sb2-SiC composite, cyclic fatigue-crack growth at elevated temperatures was affected by oxide-induced crack closure and showed an anomalous temperature dependence. After subtracting crack closure, cyclic fatigue-crack growth exhibited a temperature dependence that was governed by the viscous flow of the grain boundary phase.Made available in DSpace on 2011-05-07T14:23:12Z (GMT). No. of bitstreams: 2
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