65 research outputs found
Gold and Silver Extraction from Leach Solutions
There has been carried out an investigation on the extraction of gold and silver from thiosulfate solutions: standard test and technological solutions of chemical and electrochemical leaching. The influence of related metals on the process of extracting gold from solution was studied. There has been conducted a comparative study of the IR spectra of solutions after the sorption of gold, silver and related metals
The nature of lithium perchlorate and gallium chloride salt effect in cycloaddition reactions
Comparing the acceleration effects of (4 + 2)-, (3 + 2)- and (2 + 2)-cycloaddition reactions in the presence of the salts of two types: gallium chloride in inert solvents and lithium perchlorate (LP) in diethyl ether (DE) it was observed that in the presence of GaCl3 the acceleration effect is approximately the same (104 times) for the studied reactions, while in LPDE medium for the same reactions strong increase (up to 104 times), weak increase or even decrease of the rate and equilibrium constants take place even with the common dienophile depending on the nature of the second reagent. it was suggested that the acceleration effect of cycloaddition reactions in the presence of such Lewis acids as aluminum, gallium or boron halides is due to the sharp increase of Ξ -acceptor properties of dienophiles and therefore increasing energy of orbital interaction, whereas LPDE medium demonstrates strong stabilization of static and/or dynamic polar forms and favors reactions with charge control
Diels-Alder reaction between naphthalene and N-phenylmaleimide under ambient and high pressure conditions
The rate and equilibrium constants for the Diels-Alder reactions between benzene and naphthalene as dienes and tetracyanoethylene, maleic anhydride and N-phenylmaleimide as dienophiles at 25Β°C were estimated from empirical rule. The highest yield of the adduct was predicted for the reaction of naphthalene with N-phenylmaleimide. The time of adduct formation in 50% yield exceeds 30 years. The use of gallium chloride as a catalyst affords the exo-adduct for seven days at room temperature. The rate ((2Β±0.5)β’10-6 L mol-1 s-1) and equilibrium constants (5Β±2 L mol-1) of this reaction were determined. Under high pressure conditions (8kbar) reaction occurs with formation of both stereo isomers at 100Β°C during 80 hours. Β© ARKAT
Course of COVID-19 in Patients with Inflammatory Bowel Disease: Regional Experience
Aim: to study the course of COVID-19 in patients with inflammatory bowel diseases (IBD) using the example of the region of the Republic of Tatarstan.Material and methods. The study included 101 patients diagnosed with IBD and COVID-19, who were observed in two infectious diseases hospitals in Kazan (Republican Clinical Hospital of the Ministry of Health of the Republic of Tatarstan and City Clinical Hospital No. 7) and on an outpatient basis from April 2020 to March 2022. All patients underwent physical examination, laboratory and instrumental diagnostic methods, including a PCR test for SARSCoV-2. Chest computed tomography was performed in patients with clinical signs of moderate to severe COVID-19.Results. Ulcerative colitis (UC) was diagnosed in 60 (59.4 %) patients, Crohn's disease (CD) β in 41 (40.6 %) patients. The mean age of the patients was 41.0 Β± 14.7 years, of which 59 (58.4 %) were men and 42 (41.6 %) were women. A comparative analysis of patients with and without IBD and CT-verified lung disease was carried out. It was found that the development of viral pneumonia was influenced by age over 55 years (39.2 Β± 9.7 vs. 46.3 Β± 10.6, p < 0.05), increased Body Mass Index (BMI) (23.1 Β± 5.35 vs. 30.25 Β± 6.17, p < 0.05), hypertension (6 (8.3 %) vs. 8 (27.6 %), p < 0.05), diabetes mellitus (2 (2.7 %) vs. 5 (17.2 %), p < 0.05), the use of corticosteroids in the treatment of IBD (8 (11.1 %) vs. 10 (34.5 %), p < 0.05). In a comparative analysis of patients with IBD and COVID-19 from the SECURE-IBD database and own data, it was found that the average age of patients was comparable (42.7 vs 41.0). At the same time, in our group of male patients, there were slightly more people with DM, increased BMI, and an active course of IBD. The proportion of hospitalized patients was higher. In our cohort, there were fewer patients receiving biological therapy, but more patients on 5-aminosalicylic acid (5-ASA) and systemic corticosteroids. At the same time, lethal outcomes were comparable.Conclusion. In patients with IBD, the development of viral pneumonia was influenced by known risk factors for COVID-19: age over 55 years (p < 0.05, odds ratio (OR) 3.153), increased BMI (p < 0.05, OR 1.667), hypertensionΒ (p < 0.05, OR 2.724), diabetes (p < 0.05, OR 1.489), as well as the use of systemic corticosteroids (p < 0.05, OR 1.5)
Π‘ΠΏΠ΅ΡΠΈΡΠΈΡΠ΅ΡΠΊΠΎΠ΅ ΠΏΠΎΡΠ°ΠΆΠ΅Π½ΠΈΠ΅ ΠΌΠΈΠΎΠΊΠ°ΡΠ΄Π° ΠΏΡΠΈ Π΄ΠΈΡΡΡΠ·Π½ΠΎΠΉ Π-ΠΊΠ»Π΅ΡΠΎΡΠ½ΠΎΠΉ ΠΊΡΡΠΏΠ½ΠΎΠΊΠ»Π΅ΡΠΎΡΠ½ΠΎΠΉ Π»ΠΈΠΌΡΠΎΠΌΠ΅ (ΠΊΠ»ΠΈΠ½ΠΈΡΠ΅ΡΠΊΠΎΠ΅ Π½Π°Π±Π»ΡΠ΄Π΅Π½ΠΈΠ΅)
Introduction. Myocardial lymphoma is one of the rarest lesion localizations among all the lymphoproliferative diseases. Regardless of the current lack of generally accepted specific recommendations for the treatment of primary and secondary myocardial lymphomas the chemotherapy is carried out in accordance with clinical guidelines for the treatment of lymphoproliferative diseases, which in some cases results in a successful outcome.Materials and methods. The article presents a clinical example of the diagnostic procedure and treatment of a 65-year-old female with the following diagnosis: non-Hodgkinβs lymphoma st. II BE gr. II with the involvement of myocardium, cervical and mediastinal lymph nodes, and the right palatine tonsil. The patient received six courses of R-CEOP chemotherapy.Results and discussion. An echo-positive structure 28mm by 20 mm in size attached to the interatrial septum was found inside the right atrium following the second course of chemotherapy. Ejection fraction: 61%. Effect: regression exceeding 50%. Four months following the completion of treatment the ejection fraction was 63%, regression β exceeding 80%, thus implying a partial response.Conclusion. The diagnosis of lymphoma with a lesion in the myocardium has been positively verified by histology and IHC. Currently less invasive techniques are normally preferred, transesophageal cardiac echo guided biopsy being one. Similar to any other lymphoproliferative disease, myocardial lymphoma is a chemosensitive tumour that responds well to treatment. In each individual case, the treatment strategy must be patient-specific and take into account the somatic status of the patient, the tumour size and the degree of its spread, the tumour morphological type, and whether it would be possible to arrange adequate specialized support needed.ΠΠ²Π΅Π΄Π΅Π½ΠΈΠ΅. ΠΠΈΠΌΡΠΎΠΌΠ° ΠΌΠΈΠΎΠΊΠ°ΡΠ΄Π° β ΠΎΠ΄Π½Π° ΠΈΠ· ΡΠ°ΠΌΡΡ
ΡΠ΅Π΄ΠΊΠΈΡ
Π»ΠΎΠΊΠ°Π»ΠΈΠ·Π°ΡΠΈΠΉ ΡΡΠ΅Π΄ΠΈ Π²ΡΠ΅Ρ
Π»ΠΈΠΌΡΠΎΠΏΡΠΎΠ»ΠΈΡΠ΅ΡΠ°ΡΠΈΠ²Π½ΡΡ
Π·Π°Π±ΠΎΠ»Π΅Π²Π°Π½ΠΈΠΉ. ΠΠ΅ΡΠΌΠΎΡΡΡ Π½Π° ΠΎΡΡΡΡΡΡΠ²ΠΈΠ΅ Π½Π° ΡΠ΅Π³ΠΎΠ΄Π½ΡΡΠ½ΠΈΠΉ Π΄Π΅Π½Ρ ΠΎΠ±ΡΠ΅ΠΏΡΠΈΠ½ΡΡΡΡ
ΡΠ΅ΠΊΠΎΠΌΠ΅Π½Π΄Π°ΡΠΈΠΉ ΠΏΠΎ Π»Π΅ΡΠ΅Π½ΠΈΡ ΠΏΠ΅ΡΠ²ΠΈΡΠ½ΡΡ
ΠΈΠ»ΠΈ Π²ΡΠΎΡΠΈΡΠ½ΡΡ
Π»ΠΈΠΌΡΠΎΠΌ ΠΌΠΈΠΎΠΊΠ°ΡΠ΄Π°, Ρ
ΠΈΠΌΠΈΠΎΡΠ΅ΡΠ°ΠΏΠΈΡ ΠΏΡΠΎΠ²ΠΎΠ΄ΠΈΡΡΡ ΡΠΎΠ³Π»Π°ΡΠ½ΠΎ ΠΊΠ»ΠΈΠ½ΠΈΡΠ΅ΡΠΊΠΈΠΌ ΡΠ΅ΠΊΠΎΠΌΠ΅Π½Π΄Π°ΡΠΈΡΠΌ ΠΏΠΎ Π»Π΅ΡΠ΅Π½ΠΈΡ Π»ΠΈΠΌΡΠΎΠΏΡΠΎΠ»ΠΈΡΠ΅ΡΠ°ΡΠΈΠ²Π½ΡΡ
Π·Π°Π±ΠΎΠ»Π΅Π²Π°Π½ΠΈΠΉ, ΡΡΠΎ Π² ΡΡΠ΄Π΅ ΡΠ»ΡΡΠ°Π΅Π² ΠΏΡΠΈΠ²ΠΎΠ΄ΠΈΡ ΠΊ ΡΡΠΏΠ΅ΡΠ½ΠΎΠΌΡ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ.ΠΠ°ΡΠ΅ΡΠΈΠ°Π»Ρ ΠΈ ΠΌΠ΅ΡΠΎΠ΄Ρ. Π ΡΡΠ°ΡΡΠ΅ ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½ ΠΊΠ»ΠΈΠ½ΠΈΡΠ΅ΡΠΊΠΈΠΉ ΠΏΡΠΈΠΌΠ΅Ρ Π΄ΠΈΠ°Π³Π½ΠΎΡΡΠΈΠΊΠΈ ΠΈ Π»Π΅ΡΠ΅Π½ΠΈΡ 65-Π»Π΅ΡΠ½Π΅ΠΉ ΠΆΠ΅Π½ΡΠΈΠ½Ρ Ρ Π΄ΠΈΠ°Π³Π½ΠΎΠ·ΠΎΠΌ: ΠΠ΅Ρ
ΠΎΠ΄ΠΆΠΊΠΈΠ½ΡΠΊΠ°Ρ Π»ΠΈΠΌΡΠΎΠΌΠ° ΡΡ. II BE Π³Ρ. II Ρ ΠΏΠΎΡΠ°ΠΆΠ΅Π½ΠΈΠ΅ΠΌ ΠΌΠΈΠΎΠΊΠ°ΡΠ΄Π°, Π»ΠΈΠΌΡΠ°ΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΠ·Π»ΠΎΠ² ΡΠ΅ΠΈ, Π»ΠΈΠΌΡΠΎΡΠ·Π»ΠΎΠ² ΡΡΠ΅Π΄ΠΎΡΡΠ΅Π½ΠΈΡ, ΠΏΡΠ°Π²ΠΎΠΉ Π½Π΅Π±Π½ΠΎΠΉ ΠΌΠΈΠ½Π΄Π°Π»ΠΈΠ½Ρ. ΠΠ°ΡΠΈΠ΅Π½ΡΡ Π±ΡΠ»Π° Π²ΡΠΏΠΎΠ»Π½Π΅Π½Π° ΡΡΠΏΠ΅ΡΠ½Π°Ρ Ρ
ΠΈΠΌΠΈΠΎΡΠ΅ΡΠ°ΠΏΠΈΡ Π² ΡΠ΅ΠΆΠΈΠΌΠ΅ R-Π‘ΠΠΠ Π² 6 ΠΊΡΡΡΠΎΠ².Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ ΠΈ ΠΎΠ±ΡΡΠΆΠ΄Π΅Π½ΠΈΠ΅. ΠΠΎΡΠ»Π΅ 2-Π³ΠΎ ΠΊΡΡΡΠ° Ρ
ΠΈΠΌΠΈΠΎΡΠ΅ΡΠ°ΠΏΠΈΠΈ Π² ΠΏΠΎΠ»ΠΎΡΡΠΈ ΠΏΡΠ°Π²ΠΎΠ³ΠΎ ΠΏΡΠ΅Π΄ΡΠ΅ΡΠ΄ΠΈΡ Π»ΠΎΡΠΈΡΠΎΠ²Π°Π»Π°ΡΡ ΡΡ
ΠΎΠΏΠΎΠ·ΠΈΡΠΈΠ²Π½Π°Ρ ΡΡΡΡΠΊΡΡΡΠ°, ΡΠΈΠΊΡΠΈΡΠΎΠ²Π°Π½Π½Π°Ρ ΠΊ ΠΠΠ ΡΠ°Π·ΠΌΠ΅ΡΠ°ΠΌΠΈ 2,8 Ρ
2,0 ΡΠΌ. Π€ΡΠ°ΠΊΡΠΈΡ Π²ΡΠ±ΡΠΎΡΠ° 61 %. ΠΡΡΠ΅ΠΊΡ: ΡΠ΅Π³ΡΠ΅ΡΡΠΈΡ Π±ΠΎΠ»Π΅Π΅ 50 %. Π§Π΅ΡΠ΅Π· 4 ΠΌΠ΅ΡΡΡΠ° ΠΏΠΎΡΠ»Π΅ Π·Π°Π²Π΅ΡΡΠ΅Π½ΠΈΡ Π»Π΅ΡΠ΅Π½ΠΈΡ ΡΡΠ°ΠΊΡΠΈΡ Π²ΡΠ±ΡΠΎΡΠ° 63 %, ΡΠ΅Π³ΡΠ΅ΡΡΠΈΡ Π±ΠΎΠ»Π΅Π΅ 80 %, ΡΠ°ΡΡΠΈΡΠ½ΡΠΉ ΠΎΡΠ²Π΅Ρ.ΠΠ°ΠΊΠ»ΡΡΠ΅Π½ΠΈΠ΅. ΠΠΎΡΡΠΎΠ²Π΅ΡΠ½Π°Ρ ΠΏΠΎΡΡΠ°Π½ΠΎΠ²ΠΊΠ° Π΄ΠΈΠ°Π³Π½ΠΎΠ·Π° Π»ΠΈΠΌΡΠΎΠΌΡ Ρ ΠΏΠΎΡΠ°ΠΆΠ΅Π½ΠΈΠ΅ΠΌ ΠΌΠΈΠΎΠΊΠ°ΡΠ΄Π° ΠΎΡΠ½ΠΎΠ²ΡΠ²Π°Π΅ΡΡΡ Π½Π° ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠ°Ρ
Π³ΠΈΡΡΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΈ ΠΠΠ₯-ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ. Π Π½Π°ΡΡΠΎΡΡΠ΅Π΅ Π²ΡΠ΅ΠΌΡ ΠΏΡΠ΅Π΄ΠΏΠΎΡΡΠ΅Π½ΠΈΠ΅ ΠΎΡΠ΄Π°Π΅ΡΡΡ ΠΌΠ΅Π½Π΅Π΅ ΠΈΠ½Π²Π°Π·ΠΈΠ²Π½ΡΠΌ ΠΌΠ΅ΡΠΎΠ΄ΠΈΠΊΠ°ΠΌ, ΠΎΠ΄Π½ΠΎΠΉ ΠΈΠ· ΠΊΠΎΡΠΎΡΡΡ
ΡΠ²Π»ΡΠ΅ΡΡΡ Π±ΠΈΠΎΠΏΡΠΈΡ ΠΏΠΎΠ΄ ΠΊΠΎΠ½ΡΡΠΎΠ»Π΅ΠΌ ΡΡΠ΅ΡΠΏΠΈΡΠ΅Π²ΠΎΠ΄Π½ΠΎΠΉ ΠΡ
ΠΎ-ΠΠ. ΠΠ°ΠΊ ΠΈ ΠΏΡΠΎΡΠΈΠ΅ Π»ΠΈΠΌΡΠΎΠΏΡΠΎΠ»ΠΈΡΠ΅ΡΠ°ΡΠΈΠ²Π½ΡΠ΅ Π·Π°Π±ΠΎΠ»Π΅Π²Π°Π½ΠΈΡ, Π»ΠΈΠΌΡΠΎΠΌΠ° Ρ ΠΏΠΎΡΠ°ΠΆΠ΅Π½ΠΈΠ΅ΠΌ ΠΌΠΈΠΎΠΊΠ°ΡΠ΄Π° ΡΠ²Π»ΡΠ΅ΡΡΡ Ρ
ΠΈΠΌΠΈΠΎΡΡΠ²ΡΡΠ²ΠΈΡΠ΅Π»ΡΠ½ΠΎΠΉ ΠΎΠΏΡΡ
ΠΎΠ»ΡΡ ΠΈ Ρ
ΠΎΡΠΎΡΠΎ ΠΏΠΎΠ΄Π΄Π°Π΅ΡΡΡ Π»Π΅ΡΠ΅Π½ΠΈΡ. Π ΠΊΠ°ΠΆΠ΄ΠΎΠΌ ΡΠ»ΡΡΠ°Π΅ Π²ΠΎΠΏΡΠΎΡ ΡΠ°ΠΊΡΠΈΠΊΠΈ Π»Π΅ΡΠ΅Π½ΠΈΡ Π΄ΠΎΠ»ΠΆΠ΅Π½ ΡΠ΅ΡΠ°ΡΡΡΡ ΠΈΠ½Π΄ΠΈΠ²ΠΈΠ΄ΡΠ°Π»ΡΠ½ΠΎ, ΠΏΡΠΈΠ½ΠΈΠΌΠ°Ρ Π²ΠΎ Π²Π½ΠΈΠΌΠ°Π½ΠΈΠ΅ ΡΠΎΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠΈΠΉ ΡΡΠ°ΡΡΡ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠ°, ΠΎΠ±ΡΠ΅ΠΌ ΠΈ ΡΡΠ΅ΠΏΠ΅Π½Ρ ΡΠ°ΡΠΏΡΠΎΡΡΡΠ°Π½Π΅Π½ΠΈΡ ΠΎΠΏΡΡ
ΠΎΠ»ΠΈ, Π΅Π΅ ΠΌΠΎΡΡΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΠΉ ΡΠΈΠΏ, Π° ΡΠ°ΠΊΠΆΠ΅ Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΡΡΡ ΠΎΠΊΠ°Π·Π°Π½ΠΈΡ Π°Π΄Π΅ΠΊΠ²Π°ΡΠ½ΠΎΠΉ ΡΠΏΠ΅ΡΠΈΠ°Π»ΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΉ ΠΏΠΎΠΌΠΎΡΠΈ
Basic properties of the preparation "Loramor" in the complex treatment of purulent-inflammatory diseases of the objective facial region
The article reflects the results of the study of the main properties of the drug "Loramor" in the complex treatment of purulent-inflammatory diseases of the maxillofacial region (ΠFR) among patients who were treated in the department of maxillofacial surgery of the city medical association of Samarkand. The results of the study prove the effectiveness of the use of the drug "Loramor" in the complex treatment of purulent-inflammatory diseases of the maxillofacial region.Π ΡΡΠ°ΡΡΠ΅ ΠΎΡΡΠ°ΠΆΠ΅Π½Ρ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΠΎΡΠ½ΠΎΠ²Π½ΡΡ
ΡΠ²ΠΎΠΉΡΡΠ² ΠΏΡΠ΅ΠΏΠ°ΡΠ°ΡΠ° Β«ΠΠΎΡΠ°ΠΌΠΎΡΒ» Π² ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ½ΠΎΠΌ Π»Π΅ΡΠ΅Π½ΠΈΠΈ Π³Π½ΠΎΠΉΠ½ΠΎ-Π²ΠΎΡΠΏΠ°Π»ΠΈΡΠ΅Π»ΡΠ½ΡΡ
Π·Π°Π±ΠΎΠ»Π΅Π²Π°Π½ΠΈΠΉ ΡΠ΅Π»ΡΡΡΠ½ΠΎ-Π»ΠΈΡΠ΅Π²ΠΎΠΉ ΠΎΠ±Π»Π°ΡΡΠΈ ΡΡΠ΅Π΄ΠΈ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ²,Π½Π°Ρ
ΠΎΠ΄ΠΈΠ²ΡΠΈΡ
ΡΡ Π½Π° Π»Π΅ΡΠ΅Π½ΠΈΠΈ Π² ΠΎΡΠ΄Π΅Π»Π΅Π½ΠΈΠΈ ΡΠ΅Π»ΡΡΡΠ½ΠΎ-Π»ΠΈΡΠ΅Π²ΠΎΠΉ Ρ
ΠΈΡΡΡΠ³ΠΈΠΈ Π‘Π°ΠΌΠ°ΡΠΊΠ°Π½Π΄ΡΠΊΠΎΠ³ΠΎ Π³ΠΎΡΠΎΠ΄ΡΠΊΠΎΠ³ΠΎ ΠΌΠ΅Π΄ΠΈΡΠΈΠ½ΡΠΊΠΎΠ³ΠΎ ΠΎΠ±ΡΠ΅Π΄ΠΈΠ½Π΅Π½ΠΈΡ. ΠΠΎΠ»ΡΡΠ΅Π½Π½ΡΠ΅ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ Π΄ΠΎΠΊΠ°Π·ΡΠ²Π°ΡΡ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΡ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΡ ΠΏΡΠ΅ΠΏΠ°ΡΠ°ΡΠ° Β«ΠΠΎΡΠ°ΠΌΠΎΡΒ» Π² ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ½ΠΎΠΌ Π»Π΅ΡΠ΅Π½ΠΈΠΈ Π³Π½ΠΎΠΉΠ½ΠΎ-Π²ΠΎΡΠΏΠ°Π»ΠΈΡΠ΅Π»ΡΠ½ΡΡ
Π·Π°Π±ΠΎΠ»Π΅Π²Π°Π½ΠΈΠΉ ΡΠ΅Π»ΡΡΡΠ½ΠΎ-Π»ΠΈΡΠ΅Π²ΠΎΠΉ ΠΎΠ±Π»Π°ΡΡΠΈ
Lattice vibrations of alpha'-NaV2O5
We have measured far infrared reflectance and transmittance spectra as well
as Raman scattering spectra of \alpha'-NaV2O5 single crystals for all the
principal polarizations. The temperature range above the phase transition
temperature T_c=35 K was investigated, mainly. On the basis of this
experimental study and of the lattice dynamics calculations we conclude that
the symmetry of NaV2O5 in the high temperature phase is described by the
centrosymmetric D_{2h}^{13} space group. The assignment of the observed phonons
is given. Values of dielectric constants are obtained from the infrared data.
Asymmetric shapes of several infrared lines as well as higher order infrared
vibrational spectra are discussed. The crystal field energy levels of the 3d
electron localized at the V^{4+} site have been calculated in the framework of
the exchange charge model using the values of effective charges obtained from
the lattice dynamics calculations. According to the results of these
calculations, the earlier observed broad optical bands in the region of 1 eV
can be interpreted as phonon assisted d-d transitions.Comment: 12 pages, 8 figures, 5 tables; submitted to PR
Identifying patterns of alumni commitment in key strategic relationship programmes
Higher education institutions (HEIs) need to understand their alumni when drawing strategic relationship programmes. This paper aims to identify clusters of alumni based on their commitment relationship and to analyse factors influencing their intention to collaborate with the HEI. The study took place at a Portuguese university, considering a dataset of 1075 of alumni asserting intention to collaborate. First, a cluster analysis was conducted to identify patterns of commitment relationship. Secondly, a logistic regression was run to identify determinants of intention to collaborate. Both techniques revealed the decisive role of HEI commitment in the process. Relationship advantages and positive feelings towards the HEI were also pointed out as important. Alumni asserted recommendations, further training, sharing experiences and giving help as ways to collaborate with HEI. Regression results suggest that sociodemographic variables such as gender, marital status and volunteering are significantly associated with a probability to collaborate. Results also show that affiliation in sororities/fraternities and participation in extracurricular activities are significantly associated with that collaborative intention. The findings provide clues to support strategic relationship programmes based on consistent marketing campaigns, while bringing value to the literature in the European context, where alumni culture requires real insights to evolve.info:eu-repo/semantics/publishedVersio
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