sweeping the forest floor of frequencies

sweeping the forest floor of frequencies is a Master of Fine Art thesis project comprised of the dossier and the exhibition presented at the Artlab Gallery July 27 - August 11, 2023. My writing and multidisciplinary work foreground sonic, visual, and imperceptible signals as search modes for grounding and interconnectedness. The Comprehensive Artist Statement is the first chapter of the dossier and focuses on drawing, listening, and exploring forms of language as three dominant modes of my practice that reflect my fragmented life between three countries. In its form, the writing embraces fragmentation and iterative growth through refragmentation, drawing on my embodied experience and methods of creation in the studio. The second chapter of the dossier is an interview with Anna Friz at Wave Farm in Acra, NY that includes discussions on radio and transmission art, process-based iterative art practice, engagement of discarded materials and technology in installations, and interdisciplinary research. The third chapter includes selections from the documentation of the exhibition at the Artlab

Model reduction in computational homogenization for transient heat conduction

International audienceThis paper presents a computationally efficient homogenization method for transient heat conduction problems. The notion of relaxed separation of scales is introduced and the homogenization framework is derived. Under the assumptions of linearity and relaxed separation of scales, the microscopic solution is decomposed into a steady-state and a transient part. Static condensation is performed to obtain the global basis for the steady-state response and an eigenvalue problem is solved to obtain a global basis for the transient response. The macroscopic quantities are then extracted by averaging and expressed in terms of the coefficients of the reduced basis. Proof-of-principle simulations are conducted with materials exhibiting high contrast material properties. The proposed homogenization method is compared with the conventional steady-state homogenization and transient computational homogenization methods. Within its applicability limits, the proposed homogenization method is able to accurately capture the microscopic thermal inertial effects with significant computational efficiency

Association between carotid diameter and the advanced glycation endproduct Nε-Carboxymethyllysine (CML)

<p>Abstract</p> <p>Background</p> <p>N^ε-Carboxymethyllysine (CML) is the major non-cross linking advanced glycation end product (AGE). CML is elevated in diabetic patients and apparent in atherosclerotic lesions. AGEs are associated with hypertension and arterial stiffness potentially by qualitative changes of elastic fibers. We investigated whether CML affects carotid and aortic properties in normoglycemic subjects.</p> <p>Methods</p> <p>Hundred-two subjects (age 48.2 ± 11.3 years) of the FLEMENGHO study were stratified according to the median of the plasma CML level (200.8 ng/ml; 25^thpercentile: 181.6 ng/ml, 75^thpercentile: 226.1 ng/ml) into "high CML" versus "low CML" as determined by ELISA. Local carotid artery properties, carotid intima media thickness (IMT), aortic pulse wave velocity (PWV), blood pressure and fetuin-A were analyzed. In 26 patients after carotidectomy, CML was visualized using immunohistochemistry.</p> <p>Results</p> <p>According to the CML median, groups were similar for anthropometric and biochemical data. Carotid diameter was enlarged in the "high" CML group (485.7 ± 122.2 versus 421.2 ± 133.2 μm; P < 0.05), in particular in participants with elevated blood pressure and with "high" CML ("low" CML: 377.9 ± 122.2 μm and "high" CML: 514.5 ± 151.6 μm; P < 0.001). CML was associated fetuin-A as marker of vascular inflammation in the whole cohort (r = 0.28; P < 0.01) and with carotid diameter in hypertensive subjects (r = 0.42; P < 0.01). CML level had no effect on aortic stiffness. CML was detected in the subendothelial space of human carotid arteries.</p> <p>Conclusion</p> <p>In normoglycemic subjects CML was associated with carotid diameter without adaptive changes of elastic properties and with fetuin-A as vascular inflammation marker, in particular in subjects with elevated blood pressure. This may suggest qualitative changes of elastic fibers resulting in a defective mechanotransduction, in particular as CML is present in human carotid arteries.</p

pH control for enhanced reductive bioremediation of chlorinated solvent source zones

Enhanced reductive dehalogenation is an attractive treatment technology for in situ remediation of chlorinated solvent DNAPL source areas. Reductive dehalogenation is an acid-forming process with hydrochloric acid and also organic acids from fermentation of the electron donors typically building up in the source zone during remediation. This can lead to groundwater acidification thereby inhibiting the activity of dehalogenating microorganisms. Where the soils’ natural buffering capacity is likely to be exceeded, the addition of an external source of alkalinity is needed to ensure sustained dehalogenation. To assist in the design of bioremediation systems, an abiotic geochemical model was developed to provide insight into the processes influencing the groundwater acidity as dehalogenation proceeds, and to predict the amount of bicarbonate required to maintain the pH at a suitable level for dehalogenating bacteria (i.e., > 6.5). The model accounts for the amount of chlorinated solvent degraded, site water chemistry, electron donor, alternative terminal electron- accepting processes, gas release and soil mineralogy. While calcite and iron oxides were shown to be the key minerals influencing the soil’s buffering capacity, for the extensive dehalogenation likely to occur in a DNAPL source zone, significant bicarbonate addition may be necessary even in soils that are naturally well buffered. Results indicated that the bicarbonate requirement strongly depends on the electron donor used and availability of competing electron acceptors (e.g., sulfate, iron(III)). Based on understanding gained from this model, a simplified model was developed for calculating a preliminary design estimate of the bicarbonate addition required to control the pH for user- specified operating conditions

Сорбция радионуклидов 137Cs, 85Sr и 60Co из модельных растворов жидких радиоактивных отходов низкой активности модифицированными горючими сланцами

The results of the study of cesium, strontium, cobalt radionuclides sorption from model solutions simulating liquid radioactive waste on promising sorbents based on thermally modified oil shale are presented. The dependency of texture parameters obtained from the results of nitrogen adsorption-desorption on the treatment method of oil shale and their relationship to sorption parameters such as distribution coefficient and removal efficiency was discussed. Understanding how pore characteristics affect the sorption activity of such complex systems as sorbents is important for the creation of radionuclide sorption materials with improved characteristics. The efficiency of sorption of cesium, strontium and cobalt radionuclides was rather high for sorbent samples: the distribution coefficient was about 103–104 ml/g with a removal efficiency of more than 66 %. The most effective sorbent was obtained from oil shale with a heating rate of 5 deg/min without subsequent steam treatment, which is recommended to be used for low-active radioactive waste treatment.Представлены результаты исследования сорбции радионуклидов цезия, стронция и кобальта перспективными сорбентами на основе термически модифицированных горючих сланцев из растворов, моделирующих жидкие радиоактивные отходы. На основании результатов низкотемпературной адсорбции–десорбции азота установлена зависимость текстурных параметров исследуемых сорбентов от метода обработки горючего сланца, а также описана зависимость эффективности сорбции (по величинам сорбции и коэффициента распределения) радионуклидов от текстурных параметров сорбентов. Понимание того, каким образом характеристики пор оказывают влияние на сорбционную активность таких сложных систем, как сорбенты, важно для создания высокоэффективных сорбционных материалов с усовершенствованными характеристиками. Установлено, что материалы на основе модифицированного горючего сланца сорбируют радионуклиды цезия, стронция, кобальта с высокой эффективностью: коэффициенты распределения каждого радионуклида составляют 103–104 мл/г при степени извлечения более 66 %. Наибольшую эффективность проявляет сорбент, полученный из горючего сланца при нагреве со скоростью 5 град/ мин без последующей обработки паром. Данный сорбент рекомендован к применению для очистки жидких радиоактивных отходов низкой активности от радионуклидов цезия, стронция, кобальта

Низкотемпературный синтез мезопористых металлосиликатов типа М41S и их адсорбционные и капиллярно-конденсационные свойства

Low-temperature synthesis of the mesoporous silicates containing d-metals is carried out. The measured isotherms of low-temperature nitrogen adsorption-desorption by chrome, vanadium and zirconium silicate adsorbents belong to Type IV (b) of sorption isotherms on IUPAC classification. Such isothermal curves are inherent in mesoporous systems with the M41S type of ordering of the making elements. Increasing рН of sedimentation and metal content lead to amorphization of samples and distortion of a supramolecular lattice with uniform regular geometry and a long-range ordering.Проведен низкотемпературный синтез мезопористых силикатов, содержащих d-металлы. Измеренные изотермы низкотемпературной адсорбции–десорбции азота, полученные хромо-, ванадо- и цирконосиликатными адсорбентами, относятся к типу IV(b) изотерм сорбции по классификации IUPAC. Изотермические кривые такого рода присущи мезопористым системам с типом M41S упорядочения составляющих элементов. Увеличение рН осаждения и рост содержания металла приводят к аморфизации образцов и искажению надмолекулярной рещетки с единой регулярной геометрией и дальним порядком

Meiosis in Mice without a Synaptonemal Complex

The synaptonemal complex (SC) promotes fusion of the homologous chromosomes (synapsis) and crossover recombination events during meiosis. The SC displays an extensive structural conservation between species; however, a few organisms lack SC and execute meiotic process in a SC-independent manner. To clarify the SC function in mammals, we have generated a mutant mouse strain (Sycp1−/−Sycp3−/−, here called SC-null) in which all known SC proteins have been displaced from meiotic chromosomes. While transmission electron microscopy failed to identify any remnants of the SC in SC-null spermatocytes, neither formation of the cohesion axes nor attachment of the chromosomes to the nuclear membrane was perturbed. Furthermore, the meiotic chromosomes in SC-null meiocytes achieved pre-synaptic pairing, underwent early homologous recombination events and sustained a residual crossover formation. In contrast, in SC-null meiocytes synapsis and MLH1-MLH3-dependent crossovers maturation were abolished, whereas the structural integrity of chromosomes was drastically impaired. The variable consequences that SC inactivation has on the meiotic process in different organisms, together with the absence of SC in some unrelated species, imply that the SC could have originated independently in different taxonomic groups

ДИСПЕРСНОСТЬ И МОРФОЛОГИЯ ГИДРОЗОЛЯ ДИОКСИДА ТИТАНА

Hydrous titanium dioxide has been obtained by hydrolysis of titanium tetrachloride in aqueous solution both with and without alcohol. Method of atomic force microscopy has been used in order to investigate morphology of air dried samples of  hydrous titanium dioxide. The paper shows  formation of conglomerates in case of hydrolysis without addition of isobutyl alcohol. According to turbidimetric data particle radius of hydrosol has varied in the suspension within the range of (135 ± 5) nm that is in good correlation with atomic force microscopy data. Гидратированный диоксид титана получен гидролизом тетрахлорида титана в водной среде как в присутствии спирта, так и без него. Методом атомно-силовой микроскопии изучена морфология высушенных на воздухе образцов гидратированного диоксида титана. Показано образование конгломератов в случае проведения гидролиза без добавления изобутилового спирта. По данным турбидиметрии, радиус частиц гидрозоля в суспензии изменялся в пределах (135 ± 5) нм, что находится в хорошей корреляции с данными атомно-силовой микроскопии

СИНТЕЗ ТИТАНОСИЛИКАТНЫХ АДСОРБЕНТОВ ТИПА МСМ-41 С ИСПОЛЬЗОВАНИЕМ СУПРАМОЛЕКУЛЯРНОГО ТЕМПЛАТА

Low-temperature isotherms of nitrogen adsorption-desorption of titanosilicate adsorbents deposited on supramolecular template using titanium sulphate and sodium silicate with module equal to 1 or 3 were measured. The isotherms measured belong to Types IV (a) and IV (b) adsorption isotherms by IUPAC classification. Titanosilicate materials with isothermal curves of such type can be offered as homogeneous adsorbents with mesoporous MCM-41 type of constituent element ordering, which is characteristic of mesoporous adsorbents with hexagonal packing of homogeneous cylindrical capillary. The characterization of titanosilicate samples by the analysis of capillary and condensation properties allows us to identify secondary and tertiary slit mesopores in them. Измерены изотермы низкотемпературной адсорбции–десорбции азота титаносиликатными адсорбентами, осажденными на супрамолекулярном темплате с использованием сульфата титанила и силикатов натрия с модулем 1 и 3. Полученные изотермы относятся к типу IV(а) и IV(b) изотерм сорбции, по классификации IUPAC. Изотермические кривые такого рода присущи мезопористым системам с типом МСМ-41 упорядочения составляющих элементов, что свойственно адсорбентам с гексагональной упаковкой однородных цилиндрических капилляров. Характеристика титаносиликатных образцов путем анализа капиллярно-конденсационных свойств позволяет идентифицировать в них вторичные и третичные мезопоры щелевидной формы.