Ion dynamics in post harvest saline soil influenced by organic amendment and moisture level

Organic amendments might be effective and sustainable in the amelioration of saline soil if proper management put in place. Accordingly, subsequent pot and field experiments were conducted in a saline soil to determine the effects of moisture levels and organic amendments on cation exchange capacity (CEC), ion dynamics under rice cultivation. The increment of CEC of the studied post harvest soils was significant, except for the moist condition under field experiment. There were significant variations in ion dynamics among the treatments under both the experiments at saturated soil conditions. Exchangeable Na+ contents decreased and K+ contents increased significantly with the increased rates of treatments. Exchangeable Ca2+ and Mg2+ contents of soil followed almost the similar trends as that exhibited by K+ but not significant. Among the anions, chloride decreased significantly under both the experiments while sulfate and bicarbonate contents increased by the applied treatments. This might be due to the inherent consequences of organic amendments on these soil properties. Bangladesh J. Sci. Ind. Res.56(3), 185-194, 2021

Metal organic framework derived NaCoxOy for room temperature hydrogen sulfide removal

Novel NaCoxOy adsorbents were fabricated by air calcination of (Na,Co)-organic frameworks at 700 °C. The NaCoxOy crystallized as hexagonal microsheets of 100–200 nm thickness with the presence of some polyhedral nanocrystals. The surface area was in the range of 1.15–1.90 m2 g−1. X-ray photoelectron spectroscopy (XPS) analysis confirmed Co2+ and Co3+ sites in MOFs, which were preserved in NaCoxOy. The synthesized adsorbents were studied for room-temperature H2S removal in both dry and moist conditions. NaCoxOy adsorbents were found ~ 80 times better than the MOF precursors. The maximum adsorption capacity of 168.2 mg g−1 was recorded for a 500 ppm H2S concentration flowing at a rate of 0.1 L min−1. The adsorption capacity decreased in the moist condition due to the competitive nature of water molecules for the H2S-binding sites. The PXRD analysis predicted Co3S4, CoSO4, Co3O4, and Co(OH)2 in the H2S-exposed sample. The XPS analysis confirmed the formation of sulfide, sulfur, and sulfate as the products of H2S oxidation at room temperature. The work reported here is the first study on the use of NaCoxOy type materials for H2S remediation.

Comparison Of Effectiveness Of Silver Sulfadiazine And Gentamicin On Abrasion Wound Healing

Abrasion is injury to skin due to trauma that affects the surface of the epidermis or superficial epithelium, especially from friction to the depth of the dermal papillae. The basic principle of abrasion treatment is to maintain moist condition in wound surface. This study aims to compare the effectiveness of silver sulfadiazine (SSD) and gentamicin cream in the process of healing abrasions. A total of 30 samples of abrasion patients who came for treatment at the ED were sampled, and divided into 3 groups, namely wound care by providing SSD, gentamicin and tulle. The wound dimensions are assessed from the length and width measured at the 1st day, the 5th day, and the 10th day. At the 10th day assessment, SSD was found to be more effective in healing abrasions compared to other groups. The use of SSD in abrasion wound treatment is believed to have advantages in proliferation phase where SSD is a sulfonamide class antibiotic that produces synergic effects along with silver which constantly absorbs exudates and bacteria, combines chloride tissue and several other proteins in the process of wound healing.

Investigation of the Influence of Powder Moisture on the Spreadability Using the Spreading Tester

Moisture is often regarded as one of the main reasons for poor processability of powders using Laser-powder bed fusion (L-PBF) processes. To determine the influence of moisture on the spreadability, a superalloy powder IN718 commonly used for L‑PBF processes has been conditioned in two different states: once in the as-received and dry condition and once in a moist condition obtained by storing the powder for four weeks in an atmosphere containing a relative humidity of 75%. Using a self-built spreading tester and a subsequent analysis method specially developed for testing the spreadability of a powder, the differently conditioned IN718 powder batches have been investigated regarding the surface roughness and flatness of the powder layers. Additionally, the formation of empty spots between the powder particles in the top layer has been studied.

A Comparative Evaluation of Dimensional Accuracy and Surface Detail Reproduction for Polyvinyl Siloxane and Vinyl Siloxane Ether under Dry and Moist Conditions- An In-vitro Study

Introduction: The conventional impression procedure plays a major role in prosthodontics inspite of advancement in intra- oral scanning devices and 3D imaging procedures. Dimensional accuracy and surface detail reproduction are important for recording an impression. Aim: The study evaluated and compared the dimensional accuracy and surface detail reproduction of Polyvinyl Siloxane (PVS) and vinyl siloxane ether impression materials when used under dry and moist conditions. Materials and Methods: An in-vitro study was conducted in the Department of Prosthodontics, Rural Dental College, Pravara Institute of Medical Sciences, Loni, Ahmednagar, Maharashtra, India, for a period of two years from October 2018 to September 2020. A total of 60 impressions were made with PVS (Group A) and vinyl siloxane ether (Group B) under dry (A1, B1) and moist (A2, B2) conditions of stainless steel dies which had lines engraved on superior surface of the die. Using a Harloc’s Tool maker’s microscope, dimensional accuracy was measured by comparing the width of line Y in each impression. Surface detail reproduction was evaluated by American Dental Association (ADA) specification no. 19 where it stated continuous replication of at least any two lines out of the three lines inscribed on the die. Data analysis processing was performed in the SYSTAT version 12 (made by Crane’s software, Bangalore). Student’s unpaired t-test and Chi-square test were performed to determine statistical difference between PVS and vinyl siloxane ether where the level of significance was set at 5% and 1%. Results: The mean dimensional change and SD values for PVS under dry condition ranged from 21.93±2.46 to 22.40±2.89 (in mm). The mean dimensional change and SD values for PVS under moist condition ranged from 22.87±3.20 to 23.33±3.42. The mean dimensional change and SD values for vinyl siloxane ether under dry condition ranged from 21.93±3.61 to 24.73±5.20. The mean dimensional change and SD values for vinyl siloxane ether under moist condition ranged from 21.93±4.48 to 22.87±4.15. No statistical difference was found under dry and moist conditions within 2 hours and after 24 hours for both the materials. Conclusion: The study revealed no significant difference between dimensional accuracy and surface detail reproduction for PVS and vinyl siloxane ether. Both the materials can reproduce the details under dry and moist conditions satisfactorily and remained dimensionally stable till 24 hours after impression making.

HUBUNGAN PERSONAL HYGIENE SAAT MENSTRUASI DENGAN KEJADIAN PRURITUS VULVAE PADA REMAJA DI SMA NEGERI 7 MANADO

AbstrackBackground : Cleanliness of genetal areas (Personal Hygiene) especially when menstruation is often neglected by adolescents, if they do not maintain genetal hygiene properly, then in a moist condition, fungi and bacteria that are in the genetal area will flourish, causing itching (Pruritus Vulvae) and infection in the area. The purpose of this research was to determine the corelation between Personal Hygiene and the incidence of pruritus vulvae in adolescents in Public Senior High School 7 Manado. This research method used a descriptive analytic research design with Cross Sectional Study approach. A sample of 148 respondents were obtained using the Simple Rondom Sampling technique. The test results showed the relationship between Personal Hygiene During Menstruation with the incidence of Pruritus Vulvae with the incidence of pruritus vulvae in adolescents in the moderate category of 65 respondents (66.3%). The conclusion is that there is a relationship between Personal Hygiene and the incidence of pruritus vulvae in adolescents in Manado's 7th Middle School.Keywords: Personal Hygiene, Pruritus Vulvae, Menstruation.AbstrakLatar Belakang Kebersihan daerah genetalia (Personal Hygiene) terutama ketika menstruasi sering diabaikan oleh remaja, jika tidak menjaga kebersihan genetalia dengan benar, maka dalam keadaan lembab, jamur dan bakteri yang berada di daerah genetalia akan tumbuh subur sehingga menyebabkan rasa gatal (Pruritus Vulvae) dan infeksi pada daerah tersebut. Tujuan untuk mengetahui hubungan Personal Hygiene dengan Kejadian Pruritus Vulvae Pada Remaja di Sekolah Menengah Atas Negeri 7 Manado. Metode penelitian ini menggunakan desain penelitian yaitu Deskriptif Analitik dengan pendekatan Cross Sectional Study. Sampel berjumlah 148 responden yang didapat dengan menggunakan tehnik Simple Rondom Sampling. Hasil uji didapatkan hasil hubungan antara Personal Hygiene Saat Menstruasi dengan Kejadian Pruritus Vulvae dengan kejadian pruritus vulvae pada remaja dalam kategori sedang sebanyak 65 orang responden (66,3%).Kesimpulan ada hubungan antara Personal Hygiene dengan Kejadian Pruritus Vulvae Pada Remaja di Sekolah Menegah Atas Negeri 7 Manado.Kata kunci : Personal Hygiene, Pruritus Vulvae, Menstruasi.

Effects of different levels of soil moisture and indigenous organic amendments on the yield of boro rice grown under field condition

A field study was conducted to determine the potentials of moist (70% soil moisture) and saturated (> 100% soil moisture) soil conditions and organic amendments of rice straw compost (RSC), mustard meal (MM) and trichocompost (TC) on the selected rice varieties of BR 3, local BRRI dhan 29 and BRRI dhan 74 in relation to the growth and yield attributes of rice varieties. The rates of amendments were 0, 4, 8 t/ha for RSC; 0, 3, 6 t/ha for MM and 0, 2.5, 5 t/ha for TC. The maximum grain yield of 8.71 t/ha was attained from the RSC4ML100 and 8.58 t/ha from RSC4ML70 treatments. The moist condition of soil had almost similar effects on the number of productive tillers, grain yield, number of filled and fissured grains, 1000-grain weight and harvest index as compared to saturated condition along with the doses of RSC, MM and TC. The RSC (4 t/ha) was the superior treatment with respect to the growth and yield components of rice followed by the treatments of TC (2.5 t/ha) and MM (3 t/ha), irrespective of rice varieties and moisture levels. Dhaka Univ. J. Biol. Sci. 29(1): 87-96, 2020 (January)

Adhesion between SRP and Masonry: Influence of Moist Condition of Specimens and Presence of Salts in the Substrate

In recent years, steel reinforced polymer (SRP) composites have emerged as a new technology for structural strengthening, and several researches have validated the effectiveness of SRP for masonry strengthening. Research has been carried out to study the bond behavior of SRP composites applied to a masonry substrate. However, how the moist and salt on masonry surface will affect bond, which is the weak link in real strengthening applications, is little known yet. This study aims at investigating the bond behavior of SRP composites applied to moist and salt-laden masonry blocks that were subjected to an artificial weathering protocol. Single-lap shear tests were conducted to determine the bond behavior, while ion chromatography provided the salts distribution of weathered specimens to interpret some results of the shear tests.

The Relationship between the ITCZ and MJO Initiation over the Indian Ocean

Understanding convective initiation of the Madden–Julian oscillation (MJO) remains an unmet challenge. MJO initiation has been perceived as a process starting from a convectively suppressed large-scale condition with gradual growth of shallow convection to congestus and to deep convective and stratiform systems that cover a large-scale area. During the DYNAMO field campaign over the Indian Ocean, MJO initiation was observed to start from an existing intertropical convergence zone (ITCZ) south of the equator. This raises a question of what possible role the ITCZ may play in convective initiation of the MJO. This study addresses this question through analysis of satellite observations of precipitation and a global reanalysis product. By setting several criteria, MJO and ITCZ events were objectively identified and grouped according to whether MJO initiation was immediately preceded by an ITCZ. The results demonstrate that an ITCZ is neither a necessary nor sufficient condition for convective initiation of the MJO. Nonetheless, evolution of the large-scale circulation, moisture, and convective characteristics during MJO initiation can be different with and without a preexisting ITCZ. Convective growth begins gradually before and during MJO initiation when there is a preexisting ITCZ whereas it is abrupt and slightly delayed without a preexisting ITCZ. Such differences are presumably related to the existing large-scale moist condition of the ITCZ. The results from this study suggest that there are multiple mechanisms for convective initiation of the MJO, which should be considered in theoretical understanding of the MJO.

Preparation, Characterization and Surface Free Energy of Nickel-Doped Silica Organic–Inorganic Hybrid Membrane for H2/CO2 Separation

Nickel-doped silica organic–inorganic hybrid (Ni/SiO2) membranes based on tetraethylorthosilicate (TEOS) and methyltriethoxysilane (MTES) were prepared via a sol–gel process for H2/CO2 separation. The influence of calcination temperature and Ni-doping amount on the microstructure and surface free energy of Ni/SiO2 materials was investigated. The permeance of H2 and CO2 and vapor stability of the membranes were tested. For the Ni/SiO2 membrane, the optimal calcination temperature should be 350 °C and Ni/TEOS molar ratio is 0.1. After calcination at 350 °C, nickel element exists in form of Ni–O–Si structure and crystalline NiO with small grain size. At this temperature, the water contact angle of Ni/SiO2 film achieved a maximum of (96.1±0.4)° and the surface free energy reached the minimum. The H2 and CO2 permeance of freshly-prepared the Ni/SiO2 membrane was 7.86×10−6 and 1.50×10−6 mol m−2 Pa−1 s−1, respectively, at 25 °C and a pressure difference of 0.4 MPa. Compared with the pure SiO2 membrane, the H2 permeance and H2/CO2 selectivity of Ni/SiO2 membrane increased by 20.9% and 15.9%, respectively. After aging in the moist condition for 7 d, the H2 permeance of Ni/SiO2 membrane was reduced by 6.9% and the H2/CO2 selectivity increased by 4.7%. The Ni/SiO2 membrane showed higher H2 permeance, H2/CO2 selectivity and vapor stability than pure SiO2 membrane.