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On Designing Biopolymer-Bound Soil Composites (BSC) for Peak Compressive Strength

Journal of Renewable Materials 2020年第8期8卷 845-861页

作者： isamar rosa Henning Roedel Maria I.Allende Michael D.Lepech David J.Loftus Department of Civil and Environmental Engineering Stanford UniversityStanfordCA 94305USA Division of Space Biosciences NASA Ames Research CenterMoffet FieldCA 94035USA

Biopolymer-bound Soil Composites(BSC),are a novel bio-based construction material class,produced through the mixture and desiccation of biopolymers with inorganic aggregates with applications in soil stabilization,brick creation and in situ construction on Earth and *** paper introduces a mixture design methodology to produce maximum strength for a given soil-biopolymer *** protein and sand mix designs were investigated,with varying amounts of biopolymer solution and compaction regimes during *** ultimate compressive strength,density,and shrinkage of BSC samples are *** is observed that the compressive strength of BSC materials increases proportional to tighter particle packing(soil dry bulk density)and binder content.A theory to explain this peak compressive strength phenomenon is presented.

关键词： Compressive strength biopolymer composites material design soil bulk density in situ material utilization sustainable materials

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Problems-Based Learning during COVID-19 Pandemic: Experiences by Nursing Students

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Open Journal of Nursing 2021年第11期11卷 920-932页

作者： isamar Carolina Castillo-Megchun Claudia Gabriela López-Rossell Maribel Araceli Padilla-Rivera Rafael Villalobos-Molina Diana Cecilia Tapia-Pancardo Nursing Career Faculty of Higher Studies Iztacala National Autonomous University of Mexico Tlalnepantla Mexico Graduate and Research Division Biomedicine Unit Faculty of Higher Studies Iztacala National Autonomous University of Mexico Tlalnepantla Mexico

Introduction: Problems-based learning (PBL) methodology seeks challenges in the daily life context, where students protagonise their own learning using new technologies as the ideal means to find updated and adequate information, for its processing and dissemination towards a better active and participative role. The aim was to analyze the usefulness and importance of PBL, as a strategy of significant learning in daily experiences of nursing students during the COVID-19 pandemic. Method: The study was qualitative and phenomenological, with 15 informant students of the Module “Attention to addictions in the health area” aged 20 - 25 years, enrolled in the sixth semester of nursing from a public university. Data were collected through oral testimonies, texts, and semi-structured interviews of relevant aspects to them in their everyday life facing the COVID-19 pandemic, telling their experiences. Students signed an informed consent, and the qualitative analysis followed De Souza Minayo. Results: Four categories emerged: Category 1. Students’ experiences along pandemic;1.1, Positive experiences;1.2, Negative experiences. Category 2. Students’ knowledge and abilities for self-care along pandemic. Category 3. Abilities to promote problem solving. Category 4. Impact and usefulness of PBL in students’ experiences for health education;4.1, Positive impact of PBL;4.2 Negative impact of PBL. Conclusion: PBL is very useful for significant learning. It opens knowledge, developing skills to face, support, debate, evaluate and make decisions;it does incorporate critical thinking and problem solving. PBL does encourage collaborative work.

关键词： PBL Nurse Students Experiences COVID-19 Pandemic

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Diagnosis and management of small bowel neuroendocrine tumors:A state-of-the-art

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World Journal of Methodology 2022年第5期12卷 381-391页

作者： Jhean Gabriel Gonzáles-Yovera Pela J Roseboom Marcio Concepción-Zavaleta isamar Gutiérrez-Córdova Esteban Plasencia-Dueñas María Quispe-Flores Anthony Ramos-Yataco Carlos Alcalde-Loyola Frederick Massucco-Revoredo JoséPaz-Ibarra Luis Concepción-Urteaga Division of Gastroenterology María Auxiliadora HospitalLima 15801Peru Division of Emergency Medicine Regional Academic Hospital of TrujilloTrujillo 13011Peru Division of Endocrinology Stella Maris ClinicLima 15084Peru Division of Gastroenterology Guillermo Almenara Irigoyen National HospitalLima 12590Peru Division of Endocrinology Guillermo Almenara Irigoyen National HospitalLima 12590Peru Division of Internal Medicine Ricardo Cruzado Rivarola HospitalIca 110301Peru School of Medicine National University of TrujilloTrujillo 13007Peru Department of Medicine School of MedicineNational University of San MarcosLima 15001Peru Division of Internal Medicine School of MedicineNational University of TrujilloTrujillo 13011Peru

This review provides an update on the epidemiology,pathophysiology,symptoms,diagnosis and treatment of neuroendocrine neoplasms(NENs)of the small bowel(SB).These NENs are defined as a group of neoplasms deriving from neuroendocrine *** are currently the most common primary tumors of the SB,mainly involving the ileum,making the SB the most frequently affected part of the gastrointestinal *** NENs by definition are located between the ligament of Treitz and the ileocecal *** are characterized by small size and induce an extensive fibrotic reaction in the small intestine including the mesentery,resulting in narrowing or twisting of the *** manifestations of bowel functionality are related to the precise location of the primary *** majority of them are non-functional NENs and generally asymptomatic;in an advanced stage,NENs present symptoms of mass effect by non-specific abdominal pain or carcinoid syndrome which appears in patients with liver metastasis(around 10%).The main manifestations of the carcinoid syndrome are facial flushing(94%),diarrhea(78%),abdominal cramps(50%),heart valve disease(50%),telangiectasia(25%),wheezing(15%)and edema(19%).Diagnosis is made by imaging or biochemical tests,and the order of request will depend on the initial diagnostic hypothesis,while confirmation will always be *** patients with a localized SB NEN with or without near metastasis in the mesentery are recommended for curative *** and distant spread may be susceptible to several therapeutic strategies,such as chemotherapy,somatostatin analogs and palliative resection.

关键词： Neuroendocrine Tumor Small bowel Small intestine Gastrointestinal disease Treatment Survival

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