Panin (Italy)

The intelligent design of non-contact conductivity sensing technology for measuring steam dryness and the installation of electromagnetic flow meters for flow monitoring technology in front of the inlet of the plunger pump is carried out to achieve continuous measurement of steam dryness and flow rate injected into the reservoir during thermal recovery development of heavy oil reservoirs; The measurement results of this design are intuitive and visible, allowing for parameter comparison; By setting safety thresholds, the safe operation of the boiler can be ensured; The principle and manufacturing process of this intelligent instrument are simple, and the maintenance cost is low; At the same time, due to its ability to perform precision debugging at any time, the instrument has high measurement accuracy and meets the needs of geological workers for continuous monitoring of injected steam dryness and flow rate in heavy oil reservoirs. This technology has been tested onsite in a steam drive well group of a certain reservoir in Shuyi District, Liaohe Oilfield, and has achieved good application results. It has important guiding significance for strengthening the monitoring of steam drive reservoirs and improving the development level of heavy oil thermal recovery.

Organic semiconductor materials are widely used in the field of organic electronic devices due to their wide variety, low price, and light weight. However, their developments are still restrained by their low stability and carrier mobility. Density functional theory (DFT) was used to study the influence of doped oxygen group elements (O, S, Se, and Te) on the properties of organic semiconductor materials (seven-membered benzothiophene, o-pentacene, thiophene derivatives, and pentacene) in this paper. Based on the calculation of EHOMO, ELUMO, ΔE, and total energy, the performances of organic semiconductor materials without and with doped elements were compared, and it was found that the doping of multi-element Te makes the material have high stability and potential high mobility. For these studied organic semiconductor materials, when the atoms of the doped site change in the order of O, S, Se, and Te, the carrier mobility gradually increases, and the molecules show a tendency of stability. In this paper, promising doping elements and doping methods for these studied molecules are determined through calculations and screening out suitable materials more efficiently and economically without a large amount of repetitive experimental work, which may provide a theoretical basis and guidance for preparing high-performance organic semiconductor materials.

Herein, small Co nanoparticles (NPs) encapsulated in N-doped double-shelled carbon nanocages grafted with thin carbon nanotubes (Co@CNTs@DSCNCs) were synthesized from yolk-shell bimetallic zeolitic imidazolate framework (BMZIF). For HER electrocatalysis, they exhibit higher activity (η10 = 214 mV) and more favorable kinetics than Co@CNTs@PC (PC = porous carbon) with thick CNTs and large Co NPs derived from solid BMZIF cubes.

The Purpose of this study is to examine whether there is an effect between the variables of the board of directors, independent commissioners, and audit committees on return on equity in the food and beverage sector listed on the Stock Exchange in 2013-2017. Through purposive sampling techniques, there are 12 numbers of food and beverage industry companies that are consistently listed on the Indonesia Stock Exchange in 2013-2017. The method used in this study is an associative method using multiple regression. Statistical test results found that the variable number of board of directors, the proportion of independent commissioners, and the audit committee simultaneously influence the return on equity. If seen each variable has a different magnitude of influence of financial performance. The number of directors has a significant negative effect on return on equity, the proportion of independent directors has a significant positive effect on return on equity, but the audit committee variables does not have a significant effect on return on equity
 Tujuan penelitian ini adalah untuk menguji apakah terdapat pengaruh antara variabel dewan direksi, komisaris independen, dan komite audit terhadap return on equity pada sektor makanan dan minuman yang tercatat di BEI tahun 2013 – 2017. Melalui teknik purposive sampling, terdapat 12 jumlah perusahaan industri makanan dan minuman yang konsisten terdaftar di Bursa Efek Indonesia tahun 2013 – 2017. Metode yang digunakan dalam penelitian ini adalah metode asosiatif dengan menggunakan regresi berganda. Hasil uji statistik mendapati bahwa variabel jumlah dewan direksi, proporsi komisaris independen, dan komite audit secara simultan berpengaruh terhadap return on equity. Jika dilihat masing-masing masing-masing variabel memiliki besaran pengaruh yang berbeda terhadap kinerja keuangan. Jumlah dewan direksi memiliki pengaruh negatif signifikan terhadap return on equity, proporsi komisaris independen memiliki pengaruh positif signifikan terhadap return on equtiy, tetapi variabel komite audit tidak memiliki pengaruh yang signifikan terhadap return on equity.

Catalytic hydrogenation of CO2 to chemicals is an important approach for reducing the concentration of CO2 in the atmosphere.

3D self-supported hierarchical core/shell structured MnCo2O4@CoS nanowire or nanosheet (MCO@CS-NW or NT) arrays were designed for high-performance supercapacitors.

Graphene-based microporous carbon with a high conductivity and diverse porous structure was designed via an ionothermal method for lithium–sulfur batteries.

New work principle of additives in bulk heterojunction PSCs (BHJ-PSCs) were proposed by self-designed experiment, where crystallization of perovskite layer was hampered and recombination risk increased.

The mechanism and origin of stereoselectivities in N-heterocyclic carbine (NHC)-catalyzed [3 + 2] cycloaddition of 3-bromoenals and isatin N-Boc ketimines have been studied using density functional theory (DFT) calculations. Various possible reaction pathways were examined and analyzed. Our calculation results reveal that the catalytic cycle can be characterized by six steps: nucleophilic attack of a catalyst on 3-bromoenal (step I); [1,2]-proton transfer (step II); addition to the other reactant isatin N-Boc ketimine (step III); debromination (step IV); intramolecular cycloaddition concerted with hydrogen-elimination (step V) and elimination of the NHC catalyst (step VI). For step II, besides the direct [1,2]-proton transfer, the mediator (base and water)-assisted proton transfer has been investigated, and the DFT results show that the 2H2O cluster-mediated proton transfer is most energy favorable. The carbon-carbon bond formation step (step III) is calculated to be the stereoselectivity-determining step and the S-configuration product is the predominant product, which are in good agreement with the experimental observations. The mechanistic insights gained in this work should be helpful for other NHC-catalyzed reactions.

Hollow and solid MoO3/SiO2 nanocomposites were synthesized in reverse microemulsion. Due to its bigger surface area, shorter pore channels and thus less travelling blockage, the hollow support showed better catalytic performance than the solid one.