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Offline Exam in Hong Kong Female Chinese, Youthful appearance with a student-like look Solid chemistry knowledge (freshman university level)

Project Description: Hello, I have a mini combustion chamber simulation in Ansys Fluent 2025 R2 (Student version). I have already completed: Geometry creation Meshing (quality is good, ready for solving) I am stuck in the Setup phase and need an expert to correct it so the results become physically realistic. What I did: Used Non-Premixed Combustion model (PDF approach) For the two inlets I imported mass-flow values: 0.0277 air 0.000177 fuel For walls I tried: Coupled walls Fixed temperature Different heat flux values The problem: The temperature keeps going unrealistically high (up to 4000 °C in many runs). residuals are bad The best result I managed to get was around 2000 °C, but even that is not correct for this chamber. What I need from you: Review and correct the inle...

Project Description: I am looking for a COMSOL expert (chemical engineer / physicist) to simulate evaporation of liquid inside a vertical capillary tube using COMSOL Multiphysics (latest version preferred). Model Requirements: 2D transient model Geometry: Rectangle (0.025 mm width × 0.1 mm height) Vertical capillary tube Initially fully filled with water Room temperature conditions Evaporation driven by mass transfer (NOT temperature gradient) Outlet atmospheric humidity ≈ 50% Contact angle must form naturally (not fixed manually) Physics Expectations: Proper two-phase flow modeling (Level Set or Phase Field preferred) Surface tension effects included Transient moving interface (meniscus evolution) Realistic mass transfer modeling for evaporation Simplified or quasi-static ap...

I need detailed research on improving the durability of recycled concrete aggregate (RCA) using microbial induced calcite precipitation (MICP). The focus is on durability, specifically freeze-thaw resistance. Key Requirements: - Investigate the impact of MICP on RCA durability. - Conduct freeze-thaw resistance tests. - Provide comprehensive analysis and documentation. Ideal Skills: - Background in civil engineering or materials science. - Experience with MICP and concrete durability testing. - Strong research and analytical skills. Looking for a professional who can deliver thorough and reliable results. Certainly! Below is a revised version of the research article with added tables, diagrams, and additional references to enhance its completeness and visual appeal. Enhancing Recycled ...

I need a complete formulation for a liquid/powder, multi-purpose household cleaner that relies on biodegradable ingredients only. The end product should wash countertops, glass, and light grease without leaving residue or harmful after-effects in drains or on skin. What I am looking for: • A detailed recipe showing each ingredient, its exact percentage by weight, and its function in the formula. • Step-by-step production procedure that could be followed in a small pilot batch (5 L) and scaled to manufacturing volumes. • Guidance on sourcing the chosen biodegradable raw materials, preferably with at least two supplier options per key ingredient. • Data or references that demonstrate expected pH, viscosity, and shelf-life, plus simple tests I can run to confirm sta...

I am looking for someone who can create biomass gasification from EFB and carbon capture by MEA. The result for both biomass gasification and carbon capture by MEA need to be validated with results from the journals (biomass gasification and carbon capture by MEA has their own experimental journal). Both of them needs to be done by Aspen Plus. At the first stage, there are 2 different simulation : biomass gasification & carbon capture using MEA. The biomass gasification simulation needs to have the same result of syngas composition (CH4, CO, CO2 and H2) with the result from journal. The result needs to be validated based on the temperature at 650,700,750,800,850 and 900 Celcius. While for the MEA-carbon capture, the results need to be validated by the concentration of the MEA at 30%,...

Profile: 1. Educational Background • Chemical Engineering • Process Engineering • Energy Engineering 2. Technical Skills Core Engineering Knowledge: • Mass and energy balances • Applied thermodynamics • Natural gas systems • Experience with biomethane and biogas systems is considered a plus Modeling Tools: • Advanced Microsoft Excel (structured calculation sheets, scenario analysis, sensitivity studies) skills are mandatory • Experience with (Aspen or DWSIM) is a must. • Basic programming skills (Python or MATLAB) for parametric studies is preferred Techno-Economic Analysis: The candidate must be capable of structuring and conducting a conceptual techno-economic assessment and life cycle assessment (LCA) of gas storage and transport syst...

I'm looking for a comprehensive HVO (Hydrotreated Vegetable Oil) process design from start to finish. The project should include: - Full plant design - Costing estimates Design should encompass: - Architectural design - Mechanical systems - Machinery specifications - Full process specifications Ideal candidates should have experience in chemical process design, plant layout, and a strong understanding of HVO production. Please provide examples of similar projects you've completed.

I am looking for an FDA regulatory consultant experienced in medical devices and dental materials. I want assistance preparing a regulatory complaint regarding a dental cement product that appears to contain false ingredient declarations. I have laboratory test reports and product documentation indicating a potential misbranding issue under FDA regulations. The product is marketed in the United States and classified as a dental medical device. I would like help with: • Reviewing the laboratory test report • Evaluating regulatory violations • Preparing a formal complaint submission to the U.S. FDA

Project Title: Development and Scaling of Hydroxy(thio)pyrone Derivatives. Project Overview: We are launching a specialized chemical manufacturing project focused on the synthesis and optimization of Hydroxy(thio)pyrone compounds. These molecules are critical intermediates in medicinal chemistry. The project aims to move from bench-scale R&D to a pilot plant setup, ensuring high purity and cost-effective synthesis routes. Job Description for Chemical Engineer (R&D) Position: R&D Chemical Engineer (Specialization in Organic Synthesis) Key Responsibilities: • Process Development: Design and optimize the synthetic routes for Hydroxy(thio)pyrone. • R&D Execution: Conduct laboratory experiments to improve yield and reduce byproduct formation. • Scaling Up: Transla...

Project Title: Development and Scaling of Hydroxy(thio)pyrone Derivatives. Project Overview: We are launching a specialized chemical manufacturing project focused on the synthesis and optimization of Hydroxy(thio)pyrone compounds. These molecules are critical intermediates in medicinal chemistry. The project aims to move from bench-scale R&D to a pilot plant setup, ensuring high purity and cost-effective synthesis routes. Job Description for Chemical Engineer (R&D) Position: R&D Chemical Engineer (Specialization in Organic Synthesis) Key Responsibilities: • Process Development: Design and optimize the synthetic routes for Hydroxy(thio)pyrone. • R&D Execution: Conduct laboratory experiments to improve yield and reduce byproduct formation. • Scaling Up: Transla...

I am looking for someone who can create biomass gasification from EFB and carbon capture by MEA. The result for both biomass gasification and carbon capture by MEA need to be validated with results from the journals (biomass gasification and carbon capture by MEA has their own experimental journal). Both of them needs to be done by Aspen Plus. At the first stage, there are 2 different simulation : biomass gasification & carbon capture using MEA. The biomass gasification simulation needs to have the same result of syngas composition (CH4, CO, CO2 and H2) with the result from journal. The result needs to be validated based on the temperature at 650,700,750,800,850 and 900 Celcius. While for the MEA-carbon capture, the results need to be validated by the concentration of the MEA at 30%,...

I’m working on turning waste-protein streams into a quantifiable flow of ammonia gas and need a fresh set of eyes on the chemistry itself. The core task is process optimization: fine-tune the alkaline hydrolysis reactions so the conversion rate climbs, the reaction time drops, and the ammonia produced can be captured and measured with confidence. Where things stand • Bench-scale equipment is in place, and I can maintain stable temperature and agitation. • Early runs show ammonia, but yields are inconsistent and the reaction sometimes stalls. • I have log sheets of pH, NaOH/KOH loading, protein concentration, reaction time, and gas readings (Dräger tubes + basic NH₃ sensor). What I need from you • Review my current protocol and datasets, then pinpo...

I am in need of a formulation chemist / nutritionist / doctor with expertise in nutraceuticals, including herbal supplements, to help me create a line of products focused on health maintenance. Key Requirements: - Specialization in nutraceutical formulations, including herbal and natural supplements - Strong understanding of health and nutrition - Prior experience in product development for health maintenance - Prior experience in feasibility on different forms of product - granules, powder, dissolvable strips, viscous liquids, gummies, effervescent tablets etc Your role would be to: - Develop safe and effective health supplement formulations that cater to health maintenance - Research and select appropriate ingredients, including herbal for the formulations - suggest feasibility of diff...

Hi, I’m working on a colored flame candle development project and I’m looking for guidance from someone with chemistry experience. Objective:Create solid molded candles (not gel/container candles) that burn with bright visible flame colors such as red/magenta, green, and orange, ideally visible even in daylight. Key constraints for the project: Manufacturing must be simple and scalable. No complicated synthesis or multi-step laboratory reactions. Only cheap, easily available chemicals that can be sourced easily in the market. The candle should also support fragrance oils (scented candle). Avoid highly toxic compounds or chemicals that may create breathing hazards. Prefer materials that could realistically pass consumer product safety approvals. What I need help with:I...

I want to develop an Eau de Parfum with a distinctly floral character. The finished juice should feel elegant and modern—think soft petals that longer on skin for hours without tipping into anything powdery or old-fashioned. Here’s what I need from you: • A complete formula that can be produced at scale, including concentrations for both fragrance oils and alcohol. • Guidance on sourcing IFRA-compliant genuine raw materials so the scent can ship internationally or nationally. • Two physical lab samples (10 mL each) so I can evaluate longevity and sillage before final sign-off. • Full documentation: GC/MS breakdown, allergen listing, and clear percentages for each material to facilitate future manufacturing. My personal bias is toward a floral pr...

I need a comprehensive drinking water purification system for residential use. The system should effectively remove harmful contaminants, ensuring safe and clean drinking water. Key Requirements: - Design a user-friendly, efficient purification system - Suitable for residential scale - Ability to remove contaminants (specific contaminants to be defined) - Installation and maintenance guidelines Ideal Skills and Experience: - Expertise in water treatment technologies - Experience with residential water purification systems - Knowledge of water quality standards and regulations - Strong problem-solving skills and attention to detail Looking for a qualified professional to ensure high-quality, safe drinking water for my home.

I need an Aspen Plus specialist to build and analyse a full process-flow model for my plant concept. The priority is clear, accurate design and thorough performance analysis rather than broad optimisation at this stage. You will start from my raw stream data and block sketch, translate it into a working Aspen Plus flowsheet, size and configure the major equipment, then deliver a concise technical report that explains assumptions, convergence settings, key results and any recommendations for improvement. If you rely on add-ins or external calculation tools, note them explicitly so I understand the full workflow. Deliverables • Aspen Plus (.apw) file with fully converged flowsheet • Brief design report (PDF or Word) summarising methodology, equipment sizing, energy and mass ...

I need an experienced palm-oil technologist to help me raise the purity and improve the chemical profile of my crude palm oil by fine-tuning the existing refining line. My current production meets basic food-grade standards, but I want a cleaner product with lower FFA, peroxide, and trace metal levels so it competes with premium brands. The focus is strictly on refining process optimization—no changes to raw-material sourcing or additive blends at this stage. What I need from you • Audit of my present degumming, neutralization, bleaching, and deodorization steps (P&IDs, temperatures, residence times, vacuum levels, etc.) • Data-driven recommendations for parameter tweaks or equipment upgrades that can realistically be implemented on my line • Predicted ta...

First: Technical and Protective Products Effectiveness depends on selecting materials with a broad spectrum and high rate of action. MSF Medical Guidelines MSF Medical Guidelines Advanced Chemical Disinfectants: Chlorhexidine: Used to disinfect the skin before surgical procedures and when inserting intravenous catheters; it is characterized by its extended effect. Alcohol-Based Disinfectants: Considered the gold standard for routine hand hygiene due to their ease of use and rapid effectiveness against microbes. Modern Sterilization Equipment: Autoclaves: Use pressurized steam to sterilize surgical instruments, an essential method for ensuring complete germ elimination. Plasma or Ethylene Oxide Sterilization Techniques: For heat-sensitive instruments such as endoscopes. Personal Protective...

First: Technical and Protective Products Effectiveness depends on selecting materials with a broad spectrum and high rate of action. MSF Medical Guidelines MSF Medical Guidelines Advanced Chemical Disinfectants: Chlorhexidine: Used to disinfect the skin before surgical procedures and when inserting intravenous catheters; it is characterized by its extended effect. Alcohol-Based Disinfectants: Considered the gold standard for routine hand hygiene due to their ease of use and rapid effectiveness against microbes. Modern Sterilization Equipment: Autoclaves: Use pressurized steam to sterilize surgical instruments, an essential method for ensuring complete germ elimination. Plasma or Ethylene Oxide Sterilization Techniques: For heat-sensitive instruments such as endoscopes. Personal Protective...

I'm looking for Mathematics and Biomedical research expert and engineer to help out with project ideas and execution.