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Items from 61 to 80 out of 2,435,308 results

article

Combining arterial blood contrast with BOLD increases fMRI intracortical contrast

Nikos Priovoulos, Icaro Agenor Ferreira Oliveira, Benedikt A. Poser, David G. Norris, more

Human Brain Mapping > 44 > 6 > 2509 - 2522

BOLD fMRI is widely applied in human neuroscience but is limited in its spatial specificity due to a cortical‐depth‐dependent venous bias. This reduces its localization specificity with respect to neuronal responses, a disadvantage for neuroscientific research. Here, we modified a submillimeter BOLD protocol to selectively reduce venous and tissue signal and increase cerebral blood volume weighting...

article

Pattern recognition reveals sex‐dependent neural substrates of sexual perception

Vesa Putkinen, Sanaz Nazari‐Farsani, Tomi Karjalainen, Severi Santavirta, more

Human Brain Mapping > 44 > 6 > 2543 - 2556

Sex differences in brain activity evoked by sexual stimuli remain elusive despite robust evidence for stronger enjoyment of and interest toward sexual stimuli in men than in women. To test whether visual sexual stimuli evoke different brain activity patterns in men and women, we measured hemodynamic brain activity induced by visual sexual stimuli in two experiments with 91 subjects (46 males). In...

article

The effect of cigarette smoking on first‐trimester crown–rump length

Nicole Stamatopoulos, Chuan Lu, Samuel Vo, Mercedes Espada Vaquero, more

Australasian Journal of Ultrasound in Medicine > 26 > 1 > 21 - 25

Objectives Does cigarette smoking impact the embryonic growth rate in the first trimester? Methods This is a retrospective multicentre observational study of 2912 pregnancies. Women who presented to the early pregnancy and perinatal ultrasound units between 2010 and 2019 were included in the study. The data collected included the following: smoking status, the crown–rump length (CRL) of the pregnancy...

article

Transcranial ultrasonography imaging of a suprasellar meningioma: A case description and technical notes

Simone Meini, Carlo Rossi, Luigi Venturini, Maddalena Mura, more

Australasian Journal of Ultrasound in Medicine > 26 > 1 > 59 - 62

Background Computed tomography (CT) and magnetic resonance (MR) represent the gold standard for evaluating intracranial tumours, such as meningiomas; most meningiomas can be managed by surveillance and clinical follow‐up, therefore, the ideal technology should be cheap, non‐invasive, safe and able to reduce radiation exposure. Transcranial colour‐coded duplex sonography (TCCS) can detect space‐occupying...

article

Machine learning‐assisted multiscale modeling of an autothermal fixed‐bed reactor for methanol to propylene process

Xun Huang, Xue‐Gang Li, Wen‐De Xiao, Zidong Wei

AIChE Journal > 69 > 4 > n/a - n/a

The current commercial multistage reactor for methanol to propylene (MTP) process suffers from poor propylene selectivity and catalyst efficiency, mainly because of the low inlet methanol concentration and long residence time. In this work, we proposed an autothermal co‐current flow reactor for MTP process, where the reaction heat is continuously removed through heat exchange with cold reactants,...

article

Exceptionally effective H₂S absorption and conversion into thiols in novel superbase protic ionic liquids

Ping Liu, Kaixing Cai, Mao Liu, Fei Liu, more

AIChE Journal > 69 > 4 > n/a - n/a

We demonstrate an effective strategy for capture and conversion of H₂S in novel superbase protic ionic liquids (SPILs). It is found that the synthesized SPILs with the multiple active sites exhibit the unprecedented H₂S uptake via chemical absorption (up to 1.81 mol mol⁻¹ at 298.2 K and 1 bar). More importantly, H₂S molecule is activated by these SPILs during the absorption process, so that the activated...

article

Readily processed multifunctional SiC catalytic filter for industrial emissions control

Jiahao Chen, Yongliang Yin, Ze‐Xian Low, Kai Yuan, more

AIChE Journal > 69 > 4 > n/a - n/a

One step fabrication of SiC catalytic filter is currently limited by the mismatched calcination temperature between SiC filter (>1700°C) and the catalysts (<800°C), and the difficulty in the chemical immobilization of catalysts. Here, a SrTi_1−xCo_xO₃‐SiC (STC‐SiC) catalytic filter was directly fabricated from raw SiC grains and STC precursor oxides (SrCO₃, TiO₂, and Co₃O₄) via a single‐step reactive...

article

Data‐driven tools for the optimization of a pharmaceutical process through its knowledge‐driven model

Christopher Castaldello, Pierantonio Facco, Fabrizio Bezzo, Christos Georgakis, more

AIChE Journal > 69 > 4 > n/a - n/a

The use of computationally demanding knowledge‐driven models to optimize a process might encounter substantial numerical challenges. Because a model is an abstraction and approximation of the process, calculating the exact model optimum might not be necessary because its industrial implementation is bound to be an approximate one. Here we are exploring an alternative optimization route through a surrogate...

article

Stokes flow past an ellipsoid in a special ambient flow field: A marvelous cubic equation for a quadratic ambient field

Suraj Ugrani, Shiyan Wang, Sangtae Kim

AIChE Journal > 69 > 4 > n/a - n/a

A three‐dimensional eigenspace appears in the analysis of an ellipsoid immersed in quadratic ambient viscous flow fields. To celebrate the mathematical achievements of Babatunde Ogunnaike, we focus on mathematical details of the eigenvalues and eigenfunctions of the double‐layer operator that appears in the integral representation of velocity fields as a function of the shape parameters of the ellipsoid...

article

Oxidative coupling of methane over strontium‐doped neodymium oxide: Parametric evaluations

Faisal Alahmadi, Anastasiya Bavykina, Daria Poloneeva, Adrian Ramirez, more

AIChE Journal > 69 > 4 > n/a - n/a

Since its discovery in 1982, oxidative coupling of methane (OCM) has been considered one of the most promising approaches for the on‐purpose synthesis of ethylene. The development of more selective catalysts is essential to improve process economics. In this work, undoped neodymium oxide as well as neodymium oxide doped with high (20%) and low (2.5%) levels of strontium were tested in a high‐throughput...

article

Hydrophobicity regulation by a facial bromine substitution in MIL‐47(V) for highly selective adsorptive desulfurization

Wei Xie, Yiping Guo, Jianping Li, Honglai Liu, more

AIChE Journal > 69 > 4 > n/a - n/a

Metal organic frameworks (MOFs) have shown promising adsorptive desulfurization (ADS) capacity yet remains great challenges to maintain excellent performance in presence of water. Guided by the density function theoretical (DFT) calculations, we select bromine modified linkers with different substitution degrees to construct MIL‐47‐xBr to regulate the porosity and hydrophobicity. The optimized MIL‐47‐Br...

article

Stationary states of hydrogen‐producing reactions in nonequilibrium plasma

Xiaoshuang Chen, Elijah Thimsen

AIChE Journal > 69 > 4 > n/a - n/a

In this work, stationary states of hydrogen‐producing reactions in nonequilibrium plasmas are explored, namely the water splitting and water gas shift reactions. For both reactions, the effluent from the reactor at long residence times in the plasma was found to be independent of the influent speciation. In other words, feeding the reactor either 0.1H₂O or 0.1H₂ + 0.05O₂ by mole produced the same...

article

Silica islands regulated external Ti‐site environment of TS‐1 for enhanced performance of 1‐hexene epoxidation

Juncong Yuan, Ranfei Fu, Lunrui Fan, Yaqi Dong, more

AIChE Journal > 69 > 4 > n/a - n/a

Rational regulation of the local environment of Ti‐sites in TS‐1 harbors tremendous industrial and scientific significance to epoxidation reactions. Herein, we report a facile and environment‐friendly strategy to boost catalytic selectivity by covering the Ti‐sites on an external surface of TS‐1 (ITS‐1) without sacrificing activity of internal Ti sites. By a quantitative analysis of d₃‐acetonitrile...

article

Fast‐current‐driven synthesis of ultrathin ZIF‐8 membrane on ceramic tube for propene/propane separation

Yali Zhao, Xiayi Yang, Jiayu Luo, Yanying Wei, more

AIChE Journal > 69 > 4 > n/a - n/a

MOF membranes are very promising in molecular separation, but it is still a challenge for industrial applications due to the complex and time‐consuming synthesis. We use the fast current‐driven synthesis (FCDS) method to achieve controlled growth of ZIF‐8 membranes on porous graphite‐coated ceramic tubes by controlling the growth time and current density. Grown for 30 min at a current density of 0...

article

Discharge process challenges of an academic vascular surgery service: A qualitative study

Elizabeth R. Doss, Todd R. Vogel, Robin L. Kruse, Maraya Camazine, more

Research in Nursing & Health > 46 > 2 > 210 - 219

Vascular surgery patients have a high incidence of unplanned hospital readmissions and complications. Previous research has not fully examined specific elements of the hospital discharge process for vascular surgery patients to identify issues that may contribute to readmissions. The objective of this qualitative descriptive study was to explore challenges identified by healthcare providers and patients...

article

After Grenfell: accumulation, debris, and forming failure in London

Constance Smith

Journal of the Royal Anthropological Institute > 29 > S1 > 151 - 166

The Grenfell Tower fire in London in 2017 is popularly associated with a litany of failures: political, structural, moral, material. But while the official inquiry has sought to frame the fire as a discrete event, for local residents it is inextricable from accumulated histories of injustice and inequality. Years on, the fire still reverberates, its afterlife constellating with new narratives and...

article

Research in Nursing & Health Author Guidelines

Research in Nursing & Health > 46 > 2 > 274 - 275

article

The pragmatism of continual failure: environmental policy as experimentation in China

Charlotte Bruckermann

Journal of the Royal Anthropological Institute > 29 > S1 > 133 - 150

Faced with stifling levels of airborne pollution, Chinese citizens hold the state accountable, demanding solutions through effective environmental policy. To reduce emissions, the state has set up experimental pilot carbon markets, where potential failure is cast as integral to continuing improvement. Those in charge of conceptualizing and implementing these experiments, namely carbon bureaucrats,...

article

Effects of BAMBI on luteinized follicular granulosa cell proliferation and steroid hormone production in sheep

Yaqi Zhang, Zeyuan Guo, Zhangsheng Du, Zhichao Yao, more

Molecular Reproduction and Development > 90 > 3 > 153 - 165

Bone morphogenetic protein and activin membrane‐bound inhibitor (BAMBI) regulates mammalian ovarian follicle growth and maturation; however, its effect on luteinized granulosa cells (LGCs) in sheep ovarian follicles remains unknown. Here we explored the regulatory role of LGC functions and steroid hormone synthesis by BAMBI. Multiple sequence alignment revealed that the sheep BAMBI gene sequence was...

article

Suspending failure: temporalities, ontologies, and gigantism in fusion energy development

Catherine Alexander

Journal of the Royal Anthropological Institute > 29 > S1 > 114 - 132

Tracing the history of terrestrial fusion energy to a giant multinational experimental fusion facility under construction reveals a series of consequential failures, re‐evaluations of once defunct designs, but also persistence. To account for how this vast enterprise, dogged by failure, endures, I suggest that different ontological narratives re‐orientate the enterprise both temporally and vis‐à‐vis...

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Search results

Combining arterial blood contrast with BOLD increases fMRI intracortical contrast

Pattern recognition reveals sex‐dependent neural substrates of sexual perception

The effect of cigarette smoking on first‐trimester crown–rump length

Transcranial ultrasonography imaging of a suprasellar meningioma: A case description and technical notes

Machine learning‐assisted multiscale modeling of an autothermal fixed‐bed reactor for methanol to propylene process

Exceptionally effective H₂S absorption and conversion into thiols in novel superbase protic ionic liquids

Readily processed multifunctional SiC catalytic filter for industrial emissions control

Data‐driven tools for the optimization of a pharmaceutical process through its knowledge‐driven model

Stokes flow past an ellipsoid in a special ambient flow field: A marvelous cubic equation for a quadratic ambient field

Oxidative coupling of methane over strontium‐doped neodymium oxide: Parametric evaluations

Hydrophobicity regulation by a facial bromine substitution in MIL‐47(V) for highly selective adsorptive desulfurization

Stationary states of hydrogen‐producing reactions in nonequilibrium plasma

Silica islands regulated external Ti‐site environment of TS‐1 for enhanced performance of 1‐hexene epoxidation

Fast‐current‐driven synthesis of ultrathin ZIF‐8 membrane on ceramic tube for propene/propane separation

Discharge process challenges of an academic vascular surgery service: A qualitative study

After Grenfell: accumulation, debris, and forming failure in London

Research in Nursing & Health Author Guidelines

The pragmatism of continual failure: environmental policy as experimentation in China

Effects of BAMBI on luteinized follicular granulosa cell proliferation and steroid hormone production in sheep

Suspending failure: temporalities, ontologies, and gigantism in fusion energy development

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