Effect of Ni Substitution for Co on the Electrochemical Properties of La0.75Mg0.25Ni2.7+xCo0.4-xMn0.1Al0.3(x= 0–0.4) Hydrogen Storage Alloys Synthesized by Chemical Co-precipitation plus Reduction Method

The feasibility of substituting nickel for cobalt in La-Mg-Ni-based hydrogen storage alloys to reduce material costs and improveelectrochemical properties is investigated. The series of alloys with the chemical formula La0.75Mg0.25Ni2.7+xCo0.4-xMn0.1Al0.3(x = 0–0.4) that reflects the gradual substitution of Ni for Co are prepared by chemical co-precipitation plus reduction method.The detailed synthesis process, structure, morphology, electrochemical performance, and kinetic properties of the resulting alloyelectrodes are discussed in terms of the variation in substitution amount of Ni for Co. Results reveal that the hydrogen storage alloysubstituted with x = 0.1 exhibits the best overall electrochemical performance among all investigated samples, whereas the completesubstitution of Ni for Co has no significant effect on electrochemical performance. Based on these results, a mechanism underlyingthe effect of substituting Ni for Co on the electrochemical performance of the resulting alloy is discussed in detail and effectivelyverified by conducting three electrochemical kinetic experiments. Complete substitution of Ni for Co is found to be suitable forreducing material costs and improving the overall electrochemical performances of La-Mg-Ni-based hydrogen storage alloys

P Systems with Shuffle Operation and Catalytic-Like Rules

Shuffle operation on trajectories is useful in modeling parallel composition of wordsand languages. In this work, a new class of P systems with shuffle operation and catalytic-like rules is presented. Such a system has a membrane structure, where language-objects and shuffle-operation rules are placed in its regions. It can be used as a language generator. In this study, we propose a variant P system with shuffle operation on string-language objects. Some comparisonresults are obtained, which show that the power of shuffle operation is enlarged in the framework of P systems. Moreover, string-language objects are extended to array-language objects, and an-other variant P system with shuffle operation on picture-language objects is introduced. We also illustrate how to generate picture languages by using this kind of devices

An Improved Phase Disposition SPWM Strategy for Cascaded Multilevel Inverter

The Carrier Phase Shifted (CPS) strategy is conventional for cascaded multilevel inverter, because it can naturally ensure all cascaded cells to output balanced power. However, in point of spectra of the output line voltage, CPS is suboptimal to Phase Disposition (PD) strategy, because the latter can not naturally ensure power balance. This paper presents an improved PD strategy, inspiration from the disposition of CPS strategy triangle carriers. Just reconstructing the triangle carriers of PD strategy, it can not only reserve the waveform quality of the line voltage to be optimal, but also naturally ensure the output power of each cascaded cells to be balanced

Current fluctuations reduction strategy based on optimal three‐space‐vector pulse‐width modulation for service‐life improvement of DC‐link electrolytic capacitors in three‐phase voltage‐source inverter system

Abstract The authors propose a current fluctuation reduction strategy based on optimal three‐space‐vector pulse‐width modulation (TSVPWM), which is used to improve the service‐life of the dc‐link electrolytic capacitors in two‐level three‐phase voltage‐source inverter (VSI) system. Differing from the typical SVPWM‐based method that employs two adjacent active voltage vectors and zero voltage vectors to synthesise the reference voltage, the proposed strategy selects the required voltage vectors based on the minimum dc‐link electrolytic capacitor current fluctuation. With the proposed strategy, an objective function for the root‐mean‐square value of dc‐link electrolytic capacitor current is first constructed under the constraint of eight permissible voltage vectors. And then, by solving the minimum of the objective function through the piecewise linear programming, the optimal three voltage vectors under the different modulation ratios and load power factors are obtained accordingly, so as to achieve the minimum dc‐link electrolytic capacitor current fluctuations during each switching period. Meanwhile, a PWM implementation scheme based on positive–negative double carrier signals is presented, which not only simplifies the implementation process but also effectively reduces the switching losses of power devices. Finally, the experimental results demonstrate that the proposed strategy can minimise the dc‐link electrolytic capacitor current fluctuation under different working conditions

Effect of heat-clearing and dampness-eliminating Chinese medicine for high-risk cervical cancer papillomavirus infection: a systematic review and meta-analysis of randomized controlled trials

BackgroundHeat-clearing and dampness-eliminating Chinese medicine (HDCM) has been studied in clinical trials for cervical HPV infection for decades. However, there has been little comprehensive assessment of the strength and quality of the evidence. Therefore, this study conducted a systematic review and meta-analysis to assess the effectiveness and safety of HDCM in high-risk cervical HPV-infected patients.MethodsThe research focus questions were constructed in accordance with the criteria of participants, intervention, comparison, and outcomes (PICO), and a protocol was registered in PROSPERO. Comprehensive and systematic searches and inquiries in eight electronic databases were conducted from their inception to 30th June 2022. Further, a systematic review and meta-analysis of all randomized controlled trials (RCTs) were conducted to evaluate the HDCM therapy methods.ResultsA total of 12 studies were eligible for inclusion, including 1,574 patients. Data synthesis showed that the HPV clearance rate of HDCM groups was superior to both interferon and follow-up groups (RR = 1.40,95% CI:1.15, 1.71, P < 0.01) and (RR = 3.15, 95% CI:2.43,4.08, P < 0.01), respectively. HDCM was proven to exhibit greater potential in reducing HPV-DNA virus load (MD = −5.16, 95% CI: −5.91, −4.41, P < 0.01). The reversal rate of cervical intraepithelial neoplasia (CIN) for HDCM groups was approximately 2.8 times (RR = 2.80, 95% CI: 2.19, 3.57, P < 0.01), as high as the follow-up groups. Additionally, the recurrence rate of HR-HPV at the end of follow-up in this meta-analysis was reported to be lower in HDCM groups compared to follow-up groups [6.81% (16/235) and 14.65% (29/198), respectively]. The most commonly used Chinese herbal remedies were as follows: Huangbai (Phellodendron chinense var.Glabriusculum C.K. Schneid.), Kushen (Sophora flavescens Aiton), Daqingye (Isatis indigotica Fortune), Zicao (Arnebia hi-spidissima DC.), Baihuasheshecao (Hedyotis diffusa Spreng.), Banlangen (Isatis tinctoria subsp.tinctoria L.), Huzhang (Reynoutria japonica Houtt.), and Huangqi (Orobanche astragali Mouterde).ConclusionHDCM interventions appeared to generate significant effects on enhancing the rate of HR-HPV clearance, reducing the HPV-DNA virus load, and increasing the CIN regression rate. Some active components were confirmed to be responsible for this efficacy, which deserves further exploration.Systematic review registrationhttps://www.crd.york.ac.uk/PROSPERO/, identifier: CRD42022333226

Особенности субъективного благополучия и самореализации менеджеров среднего звена : магистерская диссертация по направлению подготовки: 37.04.01 - Психология

The methanol to olefins (mto) reaction was performed over zsm-5 zeolite at 300 degrees c under various methanol weight hourly space velocity (whsv) values. during these trials, the catalytic perfor mance was assessed, in addition to the formation and function of organic compounds retained in the zeolite. analysis of reaction effluents and confined organics demonstrated a dual-cycle reaction mechanism when employing zsm-5. the extent of the hydrogen transfer reaction, a secondary reaction in the mto process, varied as the catalyst-methanol contact time was changed. in addition, c-12/c-13-methanol switch experiments indicated a relationship between the dual-cycle mechanism and the extent of the hydrogen transfer reaction. reactions employing a low methanol whsv in conjunction with a long contact time favored the hydrogen transfer reaction to give alkene products and promoted the generation and accumulation of retained organic species, such as aromatics and methylcyclopentadienes, which enhance the aromatic cycle. when using higher whsv values, the reduced contact times lessened the extent of the hydrogen transfer reaction and limited the generation of methylcyclopentadienes and aromatic species. this suppressed the aromatic cycle, such that the alkene cycle became the dominant route during the mto reaction. (c) 2016, dalian institute of chemical physics, chinese academy of sciences. published by elsevier b.v. all rights reserved