57 research outputs found
FIG. 2 in A new species and a new record of the genus Phaeophyscia Moberg (Lecanorales, Physciaceae) from Pakistan supported by phenotypic and molecular phylogenetic analyses
No full textFIG. 2. — Phaeophyscia kaghanensis Niazi, Nadeem, Afshan & Khalid, sp. nov.: A, foliose thallus of type specimen (holo-, LAH[LAH37615]); B, apothecia; C, section of an apothecium; D, E, ascus; F, ascospores. Scale bars: A, 1 cm; B, 3 mm; C, 100 μm; D, 28 μm; E, 24 μm; F, 14 μm.Published as part of Niazi, Abdul Rehman, Afshan, Najam-ul-Sehar, Naseer, Arooj, Nadeem, Muhammad, Iftikhar, Fatima, Fayyaz, Iram, Ashraf, Asma, Imtiaz, Sawera, Fatima, Shahzadi Qamar & Khalid, Abdul Nasir, 2023, A new species and a new record of the genus Phaeophyscia Moberg (Lecanorales, Physciaceae) from Pakistan supported by phenotypic and molecular phylogenetic analyses, pp. 51-59 in Cryptogamie, Mycologie 20 (4) on page 55, DOI: 10.5252/cryptogamie-mycologie2023v44a4, http://zenodo.org/record/786720
A novel binary composite of CuCoNi-MOF/MoO3 with exceptional capacitance as electrode material for supercapacitors
No full textMetal-organic framework (MOF), a new type of electrode material with a porous structure, has shown promise as a good choice for supercapacitors in the next generation of energy storage devices. These research endeavors initiated the development of a doping technique and the creation of a composite material using solvothermal synthesis. This study involves the successful synthesis of CuCo-MOF and CuCoNi-MOF by introducing Co and Ni metals into the Cu-MOF. The CuCoNi-MOF is then combined with MoO3 to form a novel binary composite known as CuCoNi-MOF/MoO3. These prepared materials are then subjected to several physiochemical and electrochemical characterization techniques. The electrochemical characteristics of the prepared samples are estimated using a three-electrode cell setup. The analysis included cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic charge/discharge (GCD). The examination of the CV reveals that the binary composite CuCoNi-MOF/MoO3 exhibits exceptional capacitance (937.5 Fg−1 at 5 mVs−1) in comparison to the other materials that were synthesized. Moreover, the GCD study reveals that it has a capacity of 1364.69 Fg−1 at 0.5 Ag−1. Furthermore, it retained 91.5 % of its capacity after 5000 cycles demonstrating its exceptional stability. Owing to the exceptional electrochemical properties of CuCoNi-MOF/MoO3, it is employed as the positive electrode and activated carbon (Actsingle bondC) as a negative electrode for device fabrication. The supercapattery (CuCoNi-MOF/MoO3||Act-C) showed an excellent specific capacitance of 218.83 Fg−1 at 1 Ag−1 along with an outstanding energy density of 59.57 Wh.kg−1 and power density of 704.9 W.kg−1. Moreover, the assembled supercapattery device shows remarkable stability of 95.2 % at 10 Ag−1 after 15,000 cycles
Enhancement of structural and magnetic properties of M-type hexaferrite permanent magnet based on synthesis temperature
No full textThe main purpose of this research work is to develop the single domain magnetic particles of M-type barium hexaferrite (BaFe12O19) using oxide precursors employing conventional powder metallurgy technique. The phase formation and magnetic performance of the powders and magnets will be optimized by adjusting calcination and sintering temperatures. The synthesis of M-type barium hexaferrite was carried out in two sections. A series of four samples have been prepared by initial wet mixed powders calcined at different temperatures, i.e., 750, 850, 950 and 1050 degrees C. On the basis of structural analysis, the sample calcined at 950 degrees C has been selected and further divided into four parts to sintered them at 1100,1150,1200 and 1250 degrees C. The structural measurements depict the confirmation of M-type barium hexaferrite structure. SEM micrographs show the hexagonal-shaped grains. The abrupt decrease in coercivity for the sample sintered at 1250 degrees C has been seen which may be due to high sintering temperature, at which the particles have multi-domain properties
Synergistic effect of 3D porous tri-metallic MOF based electrode materials for highly stable asymmetric supercapacitors
No full textMetal-organic frameworks (MOFs) have captured huge consideration owing to their high porosity structure and large surface area for their utilization in supercapacitors. The synthesis parameters play a vital role in the morphological and structural features of MOFs. Herein, a trimetallic metal-organic framework with the morphology of flower-based hierarchical microspheres has been synthesized by solvothermal method with optimization of the reaction duration. The hierarchical structure with connected nanosheets can provide more electroactive sites that lead to exceptional electrochemical performance. NiCoMn-MOF prepared with a reaction time of 48 h (MOF-48) delivers the specific capacitance of 1905 F/g (1 A/g) with rate capability of 71.52 % (10 A/g). Furthermore, MOF-48||Act-C asymmetric supercapacitor displays a remarkable capacitance of 226 F/g (1 A/g) and keeps 97 % of initial capacitance after 15000 continuous cycles. This asymmetric device has a power density of 6945.4 W/kg (10 A/g) and an energy density of 61.52 Wh/kg (1 A/g). Therefore, this study offers an effective technique to improve the electrochemical effectiveness of MOF-based electrodes for high-performance supercapacitors.</p
Phaeophyscia microspora Aptroot & Schumm
No full textPhaeophyscia microspora Aptroot & Schumm (Fig. 3) Virtuelles Herbarium de Flechtengattungen Hyperphyscia, Paeophyscia, Physcia und Physconia: 193 (Schumm & Aptroot 2019). SPECIMENS EXAMINED. — Pakistan. Margalla Hills, Islamabad, 1604 m alt., on tree bark, 33°41’35”N, 73°03’50”E, 09.IV.2019, A. Ashraf, K. Habib & M. Usman, T5-02 (LAH[LAH37622]; GenBank[OQ024193]); Azad Jammu and Kashmir, District Bagh, 33.9259°N, 73.7810°E, 4734 m alt., on tree bark, 10.XI.2021, A. Naseer, B-04 (LAH[LAH37624]; GenBank[OQ073895]); Azad Jammu and Kashmir, District Bagh, 33°55’33.24”N, 73°46’51.6”E, 4734 m alt., on tree bark, 12.XI.2021, A. Naseer, B-05 (LAH[LAH37625]; GenBank[OQ073896]); Khyber Pakhtunkhwa, Kaghan Valley, Shogran, 34°64’N, 73°46’E, 2362 m alt., on bark, 24.VIII.2021, A. R. Niazi & M. Nadeem, SN-1 (LAH [LAH37618]; GenBank[OP933725]); Khyber Pakhtunkhwa, Kaghan Valley, Siri Paya, 33°71’N, 78°08’E, 3000 m alt., on tree bark, 26.VIII.2022, A. R. Niazi & M. Nadeem, BK-14 (LAH [LAH37617]; GenBank[OP933722]). CHEMISTRY. — Thallus K-, C-, KC-, P-; no lichen substance detected by TLC. HABITAT AND DISTRIBUTION. — Pakistani collections of this species are from humid to moist temperate, coniferous forest and scrub forest. The specimens were found on tree bark. The maximum daily temperature of the Himalaya region varies around 30-32°C during the summer, the average winter temperature is 4°C, while Margala Hills have an average maximum temperature of 34.3°C and minimum of 3.4°C with an average rainfall of 1200 mm per year. DESCRIPTION Thallus Foliose, epiphloeodal, rust grey to pale grey, remaining unchanged when wet, loosely attached to substratum, very variable in size, 2-4 cm in diam. Lobes Densely, dichotomously or irregularly branched, without pruina, lobe tips creamy white, flat to strongly convex, imbricate, usually upturned near the tips, 0.5-1.5 mm wide. Soralia and isidia Absent. Cortex Dark brown, paraplectenchymatous, 18-23 µm thick. Algal layer 28-34 µm thick. Photobiont cells Globose, 8-13 µm in diam. Medulla White. Lower surface Black, usually becoming pale to dark grey towards lobe tips, rhizinate. Rhizines Dense, black, simple, 1.3-2.5 mm long. Lower cortex Paraplectenchymatous, dark brown, 18-30 µm thick. Apothecia Abundant, usually present, 1.5-3 mm in diam., stipitate to very shortly stipitate, the margin entire or becoming regularly crenate, with prominent cortical hairs, epruinose or slightly pruinose. Disc Charcoal black, shiny, flat to strongly concave or sometimes convex. Margins Prominent, creamy to pale white. Epihymenium Light brown to orange, 18-24 µm. Hymenium Hyaline to creamy, 70-90 µm. Hypothecium Creamy white, 22-28 µm. Ascus Cylindrical to clavate, 45-55 ×12-14 µm. Ascospores Dark brown, ellipsoid, Physcia - type, 16-20 ×7.5-9 µm. Paraphyses Hyaline, branched and anastomosing, 1.7-2.8µm thick, wider at the apex, 3-4 µm thick. Pycnidia Not found.Published as part of Niazi, Abdul Rehman, Afshan, Najam-ul-Sehar, Naseer, Arooj, Nadeem, Muhammad, Iftikhar, Fatima, Fayyaz, Iram, Ashraf, Asma, Imtiaz, Sawera, Fatima, Shahzadi Qamar & Khalid, Abdul Nasir, 2023, A new species and a new record of the genus Phaeophyscia Moberg (Lecanorales, Physciaceae) from Pakistan supported by phenotypic and molecular phylogenetic analyses, pp. 51-59 in Cryptogamie, Mycologie 20 (4) on pages 56-57, DOI: 10.5252/cryptogamie-mycologie2023v44a4, http://zenodo.org/record/786720
Phaeophyscia kaghanensis Niazi, Nadeem, Afshan & Khalid 2023, sp. nov.
No full textPhaeophyscia kaghanensis Niazi, Nadeem, Afshan & Khalid, sp. nov. (Fig. 2) The taxon is characterized by its greyish white to grey thallus, absence of asexual diaspores or cortical hairs, flat to slightly concave lobes, white medulla, black lower surface, large, Physcia-type ascospores of 24-30× 12-17 µm, and absence of secondary substances. HOLOTYPE. — Pakistan. Azad Jammu and Kashmir, Garhi Dupatta, 34°36’N, 73°35’E, 817 m alt., on tree bark, 2.X.2021, N. S. Afshan & A. R. Niazi, CKR-22 (holo-, LAH [LAH37615]; GenBank[OP933723]). ADDITIONAL SPECIMEN EXAMINED. — Pakistan. Khyber Pakhtunkhwa, Kaghan Valley, Sharan, 34°30’N, 73°18’E, 2500 m alt., on tree bark, 22.VIII.2022, N. S. Afshan & A. R. Niazi, KA-17 (LAH [LAH 37616]; GenBank[OP 933724]). ETYMOLOGY. — The specific epithet ‘kaghanensis’ (Latin) refers to the type locality of Kaghan Valley. CHEMISTRY. — Thallus K-, C-, KC-, P-; no lichen substance detected by TLC. HABITAT AND DISTRIBUTION. — The known collections of the new species are from moist temperate, coniferous forest in the Himalaya in Azad Jammu and Kashmir. The specimens were found on siliceous rock. The forest is dominated by species such as Pinus roxburghii Sarg., Pyrus pashia L., Quercus oblongata D.Don and Q. glauca Thunb. The maximum daily temperature of the region varies around 30-32°C during the summer, the average winter temperature is 4°C, and there is moderate rainfall. MYCOBANK. — MB846997. DESCRIPTION Thallus Foliose, epiphloeodal, greyish white to grey, remaining unchanged when wet, loosely attached to substratum, 3-5 cm in diam., more or less circular in outline. Lobes Densely, dichotomously or irregularly branched, without pruina, lobe tips greyish-white, flat to slightly concave, imbricate, usually upturned near the tips, 0.8-2.5 mm wide. Soralia and isidia Absent. Upper surface Dark brown, paraplectenchymatous, 20-25 µm thick. Algal layer 30-35 µm thick. Photobiont cells Globose, 10-15 µm in diam. Medulla White. Lower surface Black, usually becoming pale to dark grey towards lobe tips, not rhizinate. Rhizines Absent. Lower cortex Paraplectenchymatous, dark brown, 28-35 µm thick. Apothecia Frequent, usually present, 2.5-4 mm in diam., stipitate, lacking cortical hairs, epruinose. Disc Chocolate brown to black, dull, epruinose, flat to strongly convex. Margins Prominent, creamy to pale white. Epihymenium Light brown to brownish orange, 13-17 µm. Hymenium Hyaline, 90-110 µm. Hypothecium Hyaline, 25-35 µm. Ascus Cylindrical to clavate, 70-83 × 22-28 µm. Ascospores Dark brown, ellipsoid, Physcia - type, 24-30× 12-17µm. Paraphyses Hyaline, branched and anastomosing, 2-3 µm thick, wider at the apex, 4-5 µm thick. Pycnidia Not found.Published as part of Niazi, Abdul Rehman, Afshan, Najam-ul-Sehar, Naseer, Arooj, Nadeem, Muhammad, Iftikhar, Fatima, Fayyaz, Iram, Ashraf, Asma, Imtiaz, Sawera, Fatima, Shahzadi Qamar & Khalid, Abdul Nasir, 2023, A new species and a new record of the genus Phaeophyscia Moberg (Lecanorales, Physciaceae) from Pakistan supported by phenotypic and molecular phylogenetic analyses, pp. 51-59 in Cryptogamie, Mycologie 20 (4) on pages 52-56, DOI: 10.5252/cryptogamie-mycologie2023v44a4, http://zenodo.org/record/786720
Développement de procédures de suivi statistique de données compositionnelles
No full textLa Maîtrise Statistique des Procédés (MSP) est une méthodologie largement utilisée, basée sur la mise en oeuvre des cartes de contrôle, permettant de s'assurer de la stabilité du processus et d'améliorer sa capabilité grâce à la réduction de la variabilité du processus. La sélection d'une carte de contrôle appropriée dépend du type et de la distribution des données. Lorsqu'il existe plusieurs caractéristiques de qualité, des cartes de contrôle multivariées doivent être adoptées. Mais il existe une catégorie spécifique de données multivariées qui sont contraintes par définition et connues sous le nom de données compositionnelles (CoDa). Le but de cette thèse est de proposer et d'étudiersystématiquement de nouvelles cartes de contrôle pour les données compositionnelles qui n'ont pas encore été proposées jusqu'à présent dans la littérature. La carte de contrôle de Hotelling T2-CoDa en présence d'erreur de mesure et la carte de contrôle MEWMA-CoDa en présence d'erreur de mesure ont été proposées surveiller des données compositionnelles. En outre, certaines méthodes non paramétriques pour la surveillace de données compositionnelles ont également été proposés. Les performances de chaque carte de contrôle ont été étudiées et les paramètres optimaux ont été systématiquement évalués. Des exemples de données compositionnelles réelles ont été utilisés afin d'étudier les performances des cartes proposées.Statistical Process Monitoring (SPM) is a widely used methodology, based on the implementation of control charts, for achieving process stability and improving capability through the reduction of the process variability. The selection of a suitable control chart depends on the type and distribution of he data. When there are several quality characteristics, multivariate control charts have to be adopted. But there is a specific category of multivariate data which are constrained by definition and known as Compositional Data (CoDa). This thesis makes an attempt to systematically propose new control charts for the for compositional data that have not yet been proposed so far in the literature. Hotelling T2-CoDa control chart in the presence of measurement error and MEWMACoDa control chart in the presence of measurement error has been proposed for compositional data. Furthermore, some nonparametric charts to monitor compositional data has also been proposed. The performance of each control chart has been studied and the optimal parameters have systematically been evaluated. Real life compositional data examples have been used in order to study the performances of the proposed charts
Développement de procédures de suivi statistique de données compositionnelles
No full textStatistical Process Monitoring (SPM) is a widely used methodology, based on the implementation of control charts, for achieving process stability and improving capability through the reduction of the process variability. The selection of a suitable control chart depends on the type and distribution of he data. When there are several quality characteristics, multivariate control charts have to be adopted. But there is a specific category of multivariate data which are constrained by definition and known as Compositional Data (CoDa). This thesis makes an attempt to systematically propose new control charts for the for compositional data that have not yet been proposed so far in the literature. Hotelling T2-CoDa control chart in the presence of measurement error and MEWMACoDa control chart in the presence of measurement error has been proposed for compositional data. Furthermore, some nonparametric charts to monitor compositional data has also been proposed. The performance of each control chart has been studied and the optimal parameters have systematically been evaluated. Real life compositional data examples have been used in order to study the performances of the proposed charts.La Maîtrise Statistique des Procédés (MSP) est une méthodologie largement utilisée, basée sur la mise en oeuvre des cartes de contrôle, permettant de s'assurer de la stabilité du processus et d'améliorer sa capabilité grâce à la réduction de la variabilité du processus. La sélection d'une carte de contrôle appropriée dépend du type et de la distribution des données. Lorsqu'il existe plusieurs caractéristiques de qualité, des cartes de contrôle multivariées doivent être adoptées. Mais il existe une catégorie spécifique de données multivariées qui sont contraintes par définition et connues sous le nom de données compositionnelles (CoDa). Le but de cette thèse est de proposer et d'étudiersystématiquement de nouvelles cartes de contrôle pour les données compositionnelles qui n'ont pas encore été proposées jusqu'à présent dans la littérature. La carte de contrôle de Hotelling T2-CoDa en présence d'erreur de mesure et la carte de contrôle MEWMA-CoDa en présence d'erreur de mesure ont été proposées surveiller des données compositionnelles. En outre, certaines méthodes non paramétriques pour la surveillace de données compositionnelles ont également été proposés. Les performances de chaque carte de contrôle ont été étudiées et les paramètres optimaux ont été systématiquement évalués. Des exemples de données compositionnelles réelles ont été utilisés afin d'étudier les performances des cartes proposées
High Ni Levels in Soil Can Modify Growth Performance and Mineral Status of Wheat Cultivars
No full textNickel (Ni) contamination in soil is a widespread problem in this era of industrial development. Plant cultivars respond differentially to Ni contamination in soil. In the present study, we have investigated the effect of different Ni levels to the growth and mineral status of two wheat cultivars (Sehar-2006 and LU-26). Five different levels of Ni as NiSO(4)4H(2)O (0, 30, 45, 60, and 75mgkg(-1)) were applied to soil in the pots. LU-26 performed better compared to Sehar-2006 in terms of dry weight production and physiological parameters. LU-26 contained higher Ni in roots compared to Sehar-2006, but the Ni concentration in shoots of both the cultivars was similar. LU-26 translocated less Ni toward the shoot compared to Sehar-2006 indicating the exclusion of Ni from shoots and retaining it in roots by LU-26 as evident from bioconcentration and translocation factors. Contradictly, Sehar-2006 translocated more Ni from root to shoot indicating its tolerance to Ni. Ni increased manganese (Mn) in shoots of Sehar-2006 and LU-26 up to 60 and 30mgkg(-1), respectively. Ni decreased copper (Cu) and zinc (Zn) concentration in shoots of both cultivars, however Zn concentration in roots increased at all levels of Ni. LU-26 excluded Ni from shoots and Sehar-2006 accumulated Ni in shoots. The present study helps in understanding the process of metal uptake and distribution during the early growth stages of the plant and can signify overall potential of a crop for its exploitation on contaminated soils.Faculty of Forestry, Universiti Putra MalaysiaThe authors are thankful to Institute of Soil and Environmental Sciences, University of Agriculture, Faisalabad, Pakistan for providing the lab and field facilities to carry out this work. The corresponding author is highly thankful to the Faculty of Forestry, Universiti Putra Malaysia for financial support in the form of a postdoctoral fellowship
Développement de procédures de suivi statistique de données compositionnelles
No full textStatistical Process Monitoring (SPM) is a widely used methodology, based on the implementation of control charts, for achieving process stability and improving capability through the reduction of the process variability. The selection of a suitable control chart depends on the type and distribution of he data. When there are several quality characteristics, multivariate control charts have to be adopted. But there is a specific category of multivariate data which are constrained by definition and known as Compositional Data (CoDa). This thesis makes an attempt to systematically propose new control charts for the for compositional data that have not yet been proposed so far in the literature. Hotelling T2-CoDa control chart in the presence of measurement error and MEWMACoDa control chart in the presence of measurement error has been proposed for compositional data. Furthermore, some nonparametric charts to monitor compositional data has also been proposed. The performance of each control chart has been studied and the optimal parameters have systematically been evaluated. Real life compositional data examples have been used in order to study the performances of the proposed charts.La Maîtrise Statistique des Procédés (MSP) est une méthodologie largement utilisée, basée sur la mise en oeuvre des cartes de contrôle, permettant de s'assurer de la stabilité du processus et d'améliorer sa capabilité grâce à la réduction de la variabilité du processus. La sélection d'une carte de contrôle appropriée dépend du type et de la distribution des données. Lorsqu'il existe plusieurs caractéristiques de qualité, des cartes de contrôle multivariées doivent être adoptées. Mais il existe une catégorie spécifique de données multivariées qui sont contraintes par définition et connues sous le nom de données compositionnelles (CoDa). Le but de cette thèse est de proposer et d'étudiersystématiquement de nouvelles cartes de contrôle pour les données compositionnelles qui n'ont pas encore été proposées jusqu'à présent dans la littérature. La carte de contrôle de Hotelling T2-CoDa en présence d'erreur de mesure et la carte de contrôle MEWMA-CoDa en présence d'erreur de mesure ont été proposées surveiller des données compositionnelles. En outre, certaines méthodes non paramétriques pour la surveillace de données compositionnelles ont également été proposés. Les performances de chaque carte de contrôle ont été étudiées et les paramètres optimaux ont été systématiquement évalués. Des exemples de données compositionnelles réelles ont été utilisés afin d'étudier les performances des cartes proposées
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