bluuebunny/crossref_metadata_2025_split huggingface dataset:
Über das System glattes Pt/H2O2, O2, H2O unter besonderer Berücksichtigung der Elektrodenvorbehandlung
Authors: Giner J. 
Published: October 2023

AbstractRuhespannungsmessungen am System Pt/H2O2, O2, H2O in Abhängigkeit von den Konzentrationen der Komponenten und dem PH bestätigen, daß dieses System eine mehrfache Elektrode ist. In saurer (und neutraler) Lösung ist dabei ‐ in Gegensatz zu alkalischer Lösung ‐ das Verhalten der Elektrode sehr stark von der Vorbehandlung abhängig. Dieses wird in der vorliegenden Arbeit näher untersucht.Die anodische Präpolarisation der Elektrode bei der Spannung der O2‐Entwicklung aus H2O verursacht die Bildung einer monomolekularen sauerstoffhaltigen Schicht. Diese Schicht wirkt passivierend für die anodische H2O2‐Oxydation.Die Passivierung macht sich bei der potentiostatisch aufgenommenen anodischen J‐ϵ‐Kurve (Strom‐Spannungs‐Kurve) durch eine Verminderung des Grenzstromes, bei den anodischen ϵ(t)J‐Kurven (galvanostatische Spannungs‐Zeitkurven) durch eine Verkürzung der Transitionszeit mit gleichzeitiger Erhöhung der Spannung bemerkbar; jedoch findet bei passiven Elektroden die H2O2‐Oxydation bei höheren Potentialen weiter statt.Besonders interessant ist die bei Passivierung eintretende Verkürzung der Transitionszeit. Es werden verschiedene Möglichkeiten diskutiert, die diesen Effekt verursachen können.Die anodisch gebildete Schicht passiviert auch die kathodische H2O2‐Reduktion, sie wird aber bei kathodischer Belastung abgebaut.Die heterogene katalytische Zersetzung des H2O2 an Platin ist nach R. und H. Gerischer und anderen als Kopplung der anodischen Reaktion (H2O2 → O2 + 2H+ + 2e−) mit der kathodischen Reaktion (H2O2 + 2e− + 2H+ ← 2H2O) aufzufassen. Parallelen zwischen dem Einfluß der Vorbehandlung auf die anodische H2O2‐Oxydation und auf die katalytische H2O2‐Zersetzung bestätigen diese Annahme.
Über nonvariante Punkte mit drei Hydraten eines Salzes als Bodenkörper. Untere Bildungstemperaturen von Hydraten
Authors: D'Ans J. , Freund H. E. 
Published: October 2023

AbstractAuf Grund der Löslichkeitsdaten für die ternären schwefelsauren Systeme der Sulfate des Zn, Mg, Be, Fe, Co, Ni, Mn, Cu wird geprüft, ob und inwieweit solche nonvariante Punkte nachweisbar sind.
Zur Wirkung von Alkali‐Promotoren auf Eisenkatalysatoren II. Mitteilung: Der Einfluß von Promotoren und Temperung auf die Struktur trägerfreier Eisenkatalysatoren
Authors: Kölbel Herbert , Leuteritz Günter 
Published: October 2023

AbstractEs werden die Auswirkungen der Promotoren K2CO3 und Cu sowie einer thermischen Vorbehandlung (Temperung) des Katalysator‐Ausgangsmaterials auf die Primär‐Teilchengröße und Gitterstörungen reduzierter, trägerfreier Fe‐Fällungskatalysatoren untersucht. Die röntgenographisch bestimmte Dispersität der α‐Fe‐Phase hat bci einer Temperungstemperatur von 400°C ein Maximum; eine Zugabe von 0,2 Gew.‐% K2CO3 bewirkt gegenüber einem promotorfreien reduzierten Katalysator eine Zunahme der Dispersität. Werden Cu und K2CO3 gemeinsam zugefügt, so lassen sich zwei Fälle unterscheiden:

bei konstantem K2CO3‐Gehalt (0,6 Gew.‐%) erhöhen zunehmende Cu‐Mengen (0,2; 1,0; 10 Gew.‐%) die Teilchengröße,
bei konstantem Cu‐Gehalt (0,2 Gew.‐%) ergibt eine schrittweise Erhöhung der K2CO3‐Menge von 0,25 auf 0,6 Gew.‐% ein Teilchengrößen‐Maximum bei 0,4 Gew.‐%. (Alle Prozent‐Angaben sind auf Fe bezogen.)

Die kurzperiodischen Gitterstörungen (Fe‐Phase) zeigen bei einer Temperungstemperatur von 300°C ein flaches Maximum und andern sich infolge der Promotorwirkung etwa umgekehrt proportional zur Teilcheng röße, d.h., große Teilchen haben geringe Gitterstörungen und umgekehrt.Mischkristallbildung zwischen α‐Fe und den anderen anwesenden Phasen (z.B. K2CO3; Cu; C) ist innerhalb der Meßgenauigkeit nicht feststellbar. Ein beträchtlicher Anteil des Eisens (20‐80%) besteht aus Kristalliten < 10−7 cm, während der Rest aus Eisenteilchen zwischen 1,3 · 10−6 und 2 · 10−6 cm besteht. (Angaben beziehen sich auf eine mittlere Teilchengröße.)K2CO3 wirkt unter bestimmten Bedingungen und Konzcntrationen allein und mit kleinen Mengen Cu strukturstabilisierend, wahrend größere Cu‐Zusätze das Gegenteil hervorrufen. Die Strukturmerkmale werden mit den Syntheseeigenschaften ähnlicher Kontakte verglichen. Besonders aktive und stabile Kontakte zeigen maximale Gitterstörungen und optimale Teilchengröße.
Complete Theory of Paramagnetism in Transition Metal Ions III. The Octahedral and Tetrahedral d3 and d7 Electron Configurations
Authors: König E. , Kremer S. 
Published: October 2023

AbstractOn the basis of the diagonalization of the complete Coulomb repulsion, ligand field, spin‐orbit interaction, and Zeeman effect matrices, the magnetic properties were calculated for the octahedral and tetrahedral d3 and d7 electron systems. Irreducible tensor operator (Racah) methods were used in both weak‐field and intermediate‐field coupling, and complete agreement of the results was achieved. The magnetization was evaluated by direct numerical differentiation of the energies, followed by Boltzmann averaging, and no assumptions limiting the applicability to high temperatures and small magnetic fields were introduced.Plots are presented giving the effective magnetic moment μeff as function of the ligand field parameter 10 Dq in Oh and Td symmetry for a fixed set of values of B, C, ζ, and κ The H‐dependence of μeff at cryogenic temperatures is investigated in detail. The effect of a variation in the parameter values B, C, ζ and κ is likewise studied. The results may be employed in an accurate comparison of experimental magnetic and spectroscopic data with theory.
Promoting higher engineering education: Three‐level progressive cultivation of mechanical thinking based on multi‐classroom integration
Authors: Xu Yan , Ao Yujue , Zhu Yanjunyu , Jiang Yingchun , Wang Jing , Cui Hongguang 
Published: October 2023

AbstractTo improve students' ability to solve complex engineering problems, cultivate their advanced mechanical thinking, and promote higher engineering education, in this paper, a reform of the teaching mode with the goal of advanced mechanical thinking cultivation and output orientation is carried out, and a three‐level theoretical mechanics teaching method based on multi‐classroom integration is proposed by adopting the concept of progressive cultivation of mechanical thinking. The meaning of three different levels of mechanics thinking, primary, intermediate, and advanced, and the implementation strategy of the three‐level progressive cultivation of mechanical thinking are clarified. An online and offline blended teaching method based on multi‐classroom integration is designed. The effectiveness of the proposed teaching method is verified by the combination of the evaluation of the examination score, the achievement of course objectives, and students' learning satisfaction. The results show that the final evaluation score in 2022 is 17.4% higher than that in 2021, and the score distribution shows a skewed distribution, with most students' scores skewing toward the excellent range, indicating that after adopting this teaching method, different students can eventually have similar excellent learning outcomes even though they start learning with different foundations and abilities. In addition, the three‐course objectives in 2022 are achieved at high degrees of 78.3, 81.5, and 81.3, respectively, which are significantly higher than those in 2021. Meanwhile, the questionnaire results show that students are satisfied with the teaching method, which fully proves that the teaching mode can achieve good teaching effectiveness.
Enhancement of Propylene Metathesis Performance of MoO3/Al2O3 with Promotion of Phosphoric Acid
Authors: Qin Gaolei , Yang Yibo , Yin Anping , Cai Yuhang , Gong Nengfeng , Zhou Ziyu , Song Gengzhe , Zhang Xiangjie , Wan Hongliu , Sun Xiaodong , Yang Yong , Li Yongwang , Cao Zhi 
Published: October 2023

AbstractCatalytic olefin metathesis represents a vital reaction in the chemical industry, as it provides a feasible route for the interconversion of olefins. However, traditional supported catalysts usually suffer from low activity due to sluggish kinetics for the formation of catalytically active metal‐carbene species. This work tackles this issue by taking phosphoric acid as a promoter and constructing a Brønsted acidic site to cooperate with the MoOx sites, thus facilitating the formation of Mo‐carbene. It turns out that the turnover frequency of propene metathesis over the Mo−P/Al2O3 catalyst is 7.1 times higher than that over the unmodified Mo/Al2O3 catalyst. The combined characterization reveals the promotion of phosphorus results from the alignment of olefin toward adjacent MoOx and thus facilitates formation of active Mo‐carbene species.
Periglacial resurfacing of hillslopes and channels with large boulders in the Virginia Appalachians
Authors: Fame Michelle L. , Chilton Kristin D. , Spotila James A. , Kelly Meredith A. , Caton Summer A. 
Published: October 2023

AbstractLarge, resistant, quartz‐rich boulders deposited on hillslopes and in channels armour the landscape, trap sediment and influence hillslope angle and erodibility. In the Virginia Appalachians, such boulders are a significant component of hillslopes and channels. Establishing the timing of and processes responsible for bedrock fracture and boulder deposition is a critical piece of understanding the landscape as a system. In this study, we use cosmogenic 10Be exposure dating to resolve the timing of boulder deposition at three sites in the Virginia Valley and Ridge province: Gap Mountain, Brush Mountain and Little Stony Creek, and at one site in the Virginia Blue Ridge: Devil's Marbleyard. The correlation between measured boulder exposure ages (101.7 ± 6.9 ka to 10.8 ± 0.8 ka; n = 23) and the Wisconsin Glacial Stage and subsequent Laurentide Ice Sheet (LIS) deglaciation (~115–11.7 ka) suggests a periglacial origin for deposition of large hillslope and channel boulders in the Virginia Appalachians. The lack of boulder exposure ages corresponding to the Last Interglacial Stage or following Wisconsin LIS retreat suggests interglacial non‐deposition and stability. The absence of exposure ages from the penultimate Illinoian or older Quaternary Glacial Stages suggests that periglacial hillslope processes allow the landscape to be resurfaced with large boulders during each return to cold climate conditions. This cyclic resurfacing of hillslopes and channels is an example of how climatic oscillations insert disequilibrium into the landscape cycle and contributes to our appreciation of the timescales over which contemporary climate change may impact boulder dominated landscapes in rapidly warming alpine and arctic environments.
Prefabricated fibula free flaps in reconstruction of maxillofacial defects: Two cases of transplanting a fractured fibula
Authors: Huizinga Martin P. , Stenekes Martin W. , Kraeima Joep , de Visscher Sebastiaan A. H. J. , Raghoebar Gerry M. , Werker Paul M. N. , Witjes Max J. H. 
Published: October 2023

AbstractBackgroundThe two‐staged prefabricated vascularized fibula free flap is used in maxillofacial reconstruction. We describe the possible cause and management of two cases of fibula fracture after implant placement.MethodsThe patients were treated with two‐stage reconstruction with a prefabricated vascularized fibula free flap. Six dental implants were placed in both fibulas. Fibula fractures occurred during the osseointegration period before the second procedure. The reconstruction was continued as planned.ResultsBoth fibulas fractured in the distal segment, possibly due to a thinner cortex more distally. Harvesting of a fractured fibula flap is more difficult than normally due to callus formation and fibrosis. Both transplants became fully functional with extended healing and additional surgery.ConclusionThe fracture apparently did not compromise the vascularisation of the fibula and proved still sufficient for successful harvest and transfer of the flap. The patient should be made aware that additional corrective surgery may be indicated.
Future projections of extreme precipitation in Tropical America and Panama under global warming based on 150‐year continuous simulations using 20‐km and 60‐km atmospheric general circulation models
Authors: Nakaegawa Tosiyuki , Mizuta Ryo 
Published: October 2023

AbstractThis study explores future changes in extreme precipitation across tropical America and Panama using 150‐year continuous experiments run on the Meteorological Research Institute atmospheric general circulation model at horizontal resolutions of 20 km (AGCM20) and 60 km (AGCM60). Tropical America is a warming hotspot where the mean seasonal precipitation amounts are decreasing, but annual maximum daily precipitation amounts are following an increasing trend. In Panama, future climates simulated using AGCM20 and AGCM60 show an increase in December–January–February (DJF) precipitation over eastern Panama, and a decrease in June–July–August (JJA) precipitation over western areas near the Pacific coast. Annual maximum daily precipitation increases on the eastern side of the country in both models. The mean annual maximum daily precipitation for tropical America shows decadal oscillations, similar to the global mean but with smaller amplitude variations. The mean annual maximum daily precipitation for Panama shows large oscillations, even for the 10‐year running mean. For tropical America, the mean annual maximum daily precipitation has a linear relationship with surface air temperature that is independent of the Representative Concentration Pathway scenarios, but this is not the case for Panama. Temporal correlations between the tropical America mean annual maximum daily precipitation and annual mean surface air temperature in the historical experiments have a geographical distribution similar to that of the sea surface temperature anomalies during negative El Niño/Southern Oscillation events, but not in the future experiments. The correlation between the Panama mean annual maximum daily precipitation and surface air temperature in both the historical and future experiments has a geographical distribution similar to that of the temporal correlation for the tropical America mean in the historical experiment. The annual maximum daily precipitation in Panama is projected to increase during negative El Niño events in the future, as observed in the historical climate.
Recurrent oesophageal obstruction secondary to tracheal ring deformity in a horse: Computed tomographic diagnosis
Authors: Gojdyk Tatiana , Joostens Zoë , Mariën Tom , Cerri Simona 
Published: October 2023

AbstractThis paper describes the case of a 14‐year‐old mare suffering from recurrent oesophageal obstruction caused by tracheal ring deformity. The anomaly provoking proximal oesophagus entrapment was characterised by a protrusion of the dorsal extremities of the cartilage rings, further diagnosed by computed tomography. Tracheal ring deformity should be considered as a rare cause of recurrent oesophageal obstruction.
MHC class III lymphocyte antigens 6 as endogenous immunotoxins: Unlocking immunotherapy in proficient mismatch repair colorectal cancer
Authors: Giordano Guido , Pancione Massimo 
Published: October 2023

AbstractA majority of cancers, including colorectal cancer (CRC) with intact DNA mismatch repair, exhibit a paralyzed antitumor immune response and resistance to immune checkpoint inhibitors. Members of MHC class III lymphocyte antigen 6G (LY6G) encode glycosylphosphatidylinositol (GPI) proteins anchored to the membrane. Snake venom neurotoxins and LY6G proteins share a three‐finger (3F) folding domain. LY6 proteins such as LY6G6D are gaining a reputation as excellent tumor‐associated antigens that can potently inhibit anti‐tumor immunity in cancers with proficient mismatch repair. Thus, we called MHC class III LY6G endogenous immunotoxins. Since the discovery of LY6G6D as a tumor‐associated antigen, T‐cell engagers (TcEs) have been developed to simultaneously bind LY6G6D on cancer cells and CD3 on T cells, improving the treatment of metastatic solid tumors that are resistant to ICIs. We present a current understanding of how alterations in MHC class III genes inhibit antitumor immunity, and how these understandings can be turned into effective treatments for patients who are refractory to standard immunotherapy.This article is categorized under:
Cancer > Genetics/Genomics/Epigenetics
Cancer > Molecular and Cellular Physiology
Complementing family firm and managerial views of doing business through management accounting tools
Authors: Leotta Antonio , Rizza Carmela , Ruggeri Daniela 
Published: October 2023

AbstractContributions to the family firm literature have given attention to different challenges that family firms have to face in their life cycle when organisational complexity increases and managerial processes are required. This paper investigates how management accounting (MA) tools enable family and managerial views of doing business to complement each other during the professionalisation process. In particular, the paper discusses a longitudinal case study on a family firm’s professionalisation, when an external advisor introduced financial ratio analysis and contribution margin reports. The case evidence shows that MA tools, by facilitating communication amongst family firm members and the external advisor, favours the complementing between family firm and managerial views of doing business during the professionalisation process. When simultaneously trusting family firm and managerial views of doing business, family firm members had the chance to interpret business facts differently, discovering new business opportunities. The paper contributes to the family business literature examining the professionalisation process through the pragmatic constructivist (PC) perspective that analyses the main traits of family firm and managerial views of doing business, stressing the relevance of values in interpreting business facts and in identifying factual possibilities. On this issue, the PC perspective is useful in understanding the role of MA tools as a communication basis for enabling the complementing of different views of doing business during the professionalisation process.
Potent anticancer activity of (Z)-3-hexenyl-β-D-glucopyranoside in pancreatic cancer cells
Authors: Zaher Ahmed M. , Anwar Walaa S. , Makboul Makboul A. , Abdel-Rahman Iman A. M. 
Published: October 2023

AbstractThis current study reports, for the first time, on the potent cytotoxicity of (Z)-3-hexenyl-β-D-glucopyranoside, as well as its cellular and molecular apoptotic mechanisms against Panc1 cancer cells. The cytotoxicity of three compounds, namely (Z)-3-hexenyl-β-D-glucopyranoside (1), gallic acid (2), and pyrogallol (3), which were isolated from C. rotang leaf, was investigated against certain cancer and normal cells using the MTT assay. The cellular apoptotic activity and Panc1 cell cycle impact of compound (1) were examined through flow cytometry analysis and Annexin V-FITC cellular apoptotic assays. Additionally, RT-PCR was employed to evaluate the effect of compound (1) on the Panc1 apoptotic genes Casp3 and Bax, as well as the antiapoptotic gene Bcl-2. (Z)-3-hexenyl-β-D-glucopyranoside demonstrated the highest cytotoxic activity against Panc1 cancer cells, with an IC50 value of 7.6 µM. In comparison, gallic acid exhibited an IC50 value of 21.8 µM, and pyrogallol showed an IC50 value of 198.2 µM. However, (Z)-3-hexenyl-β-D-glucopyranoside displayed minimal or no significant cytotoxic activity against HepG2 and MCF7 cancer cells as well as WI-38 normal cells, with IC50 values of 45.8 µM, 108.7 µM, and 194. µM, respectively. (Z)-3-hexenyl-β-D-glucopyranoside (10 µM) was demonstrated to induce cellular apoptosis and cell growth arrest at the S phase of the cell cycle in Panc1 cells. These findings were supported by RT-PCR analysis, which revealed the upregulation of apoptotic genes (Casp3 and Bax) and the downregulation of the antiapoptotic gene Bcl-2. This study emphasizes the significant cellular potency of (Z)-3-hexenyl-β-D-glucopyranoside in specifically inducing cytotoxicity in Panc1 cells.
Graphical Abstract
Clinical Features, Incidence and Treatment Outcome in Pregnancy-Associated Osteoporosis: A Single-Centre Experience over Two Decades
Authors: Orhadje Elizabeth , Berg Kathryn , Hauser Barbara , Ralston Stuart H. 
Published: October 2023

AbstractPregnancy-associated osteoporosis (PAO) is a rare syndrome which typically presents with vertebral fractures during pregnancy or lactation. The medical records of sixteen patients with PAO who presented to a specialist clinic at the Western General Hospital in Edinburgh over a 20-year period were reviewed to evaluate the mode of presentation, potential risk factors and response to treatment. The most common presentation was back pain occurring in 13/16 (81.2%) individuals due to multiple vertebral fractures. The diagnosis was usually made postpartum and in 12/16 individuals (75.0%), PAO presented during the woman’s first pregnancy. Medicines which could have contributed to the development of PAO included thromboprophylaxis therapies in 8 subjects (50.0%), inhaled or injected corticosteroids in 5 (31.3%), anticonvulsants in 2 (12.5%) and a LHRH agonist in 1 (6.3%). Five individuals reported a family history of osteoporosis, and two pregnancies were complicated by hyperemesis gravidarum. Treatments administered included calcium and vitamin D supplements, bisphosphonates and teriparatide. Bone mineral density increased following the diagnosis in all cases, regardless of treatment given. One patient had further fracture during follow-up, but four patients had subsequent pregnancies without fractures. We estimated that in this locality, the incidence of PAO was 6.8/100,000 pregnancies with a point prevalence of 4.1 per 100,000 women. This case series indicates the importance of family history of osteoporosis and thromboprophylaxis drugs as risk factors for PAO while also demonstrating that the reductions in bone density tend to reverse with time, irrespective of the treatment given.