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Related Concept Videos

Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
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Center of Gravity00:58

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The center of gravity (COG) of an object is the point where the object's total weight is considered to be concentrated. Knowing the location of the center of gravity is useful when predicting the behavior of a moving object or designing static structures. In a uniform gravitational field, the center of gravity is similar to the center of mass (COM); yet, these two points can be positioned differently. For example, the Moon's center of mass lies very close to its geometric center, but...
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The center of gravity is the point at which an object's weight appears to be concentrated and can be used to balance the object perfectly. This point is essential in mechanics as it provides information regarding a body's stability and moments of inertia. The center of gravity does not always have to fall within the shape or boundaries of the body; it may also lie outside the body in certain cases.
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Center of Mass00:59

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The center of mass is the point at which the total mass of an object can be said to be concentrated. It is a fundamental principle in mechanics and physics that applies to all objects regardless of their shape or size. The center of gravity is the point at which an object’s weight appears to be concentrated and can be used to balance the object perfectly.
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General plane motion, often observed in a rolling wheel, refers to a type of movement where the wheel is simultaneously rotating and translating. This complex motion can be understood by breaking it down into individual components.
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Patient-centered care involves delivering care beyond inpatient hospitalization. Reflective practice can enhance a patient-centered approach. Reflective practice is a process of reasoning that considers all aspects of the present situation, including practicalities, learning from personal practice, and consideration of patient needs. Patients appreciate care decisions made while considering their input. Involving the patient in their care provides the patient with a sense of contribution rather...
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Related Experiment Video

Updated: Jan 22, 2026

Laparoscopic Anatomical Right Hemihepatectomy via the In Situ Anterior Approach
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Laparoscopic Anatomical Right Hemihepatectomy via the In Situ Anterior Approach

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Robotic vs laparoscopic hemihepatectomy: A comparative study from a single center.

Zi-Zheng Wang1, Wen-Bo Tang1, Ming-Gen Hu1

  • 1Department of Hepatopancreatobiliary Surgical Oncology, Military Institution of Hepatopancreatobiliary Surgery, The First Medical Center of Chinese People's Liberation Army (PLA) General Hospital, Beijing, China.

Journal of Surgical Oncology
|July 18, 2019
PubMed
Summary

Robotic hemihepatectomy offers similar outcomes to laparoscopic hemihepatectomy (LH), with reduced blood loss and fewer conversions. This robotic approach is safe and feasible for selected patients undergoing liver resection.

Keywords:
hemihepatectomylaparoscopic surgeryminimally invasive surgeryrobotic surgery

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Last Updated: Jan 22, 2026

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Published on: August 8, 2025

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Area of Science:

  • Minimally Invasive Surgery
  • Hepatobiliary Surgery
  • Surgical Oncology

Background:

  • Robotic surgery adoption in hepatectomy is growing.
  • Limited comparative data exists for robotic versus laparoscopic hemihepatectomy (LH) in large cohorts.
  • This study addresses the need for comparative outcomes analysis.

Purpose of the Study:

  • To compare perioperative outcomes between robotic and laparoscopic hemihepatectomy (LH).
  • To evaluate the safety and feasibility of robotic hemihepatectomy.
  • To identify potential advantages of the robotic approach.

Main Methods:

  • Retrospective analysis of consecutive patients undergoing robotic or LH.
  • Data collected from November 2011 to July 2017 at a single institution.
  • Inclusion of demographics, clinicopathologic characteristics, and perioperative outcomes.

Main Results:

  • 92 patients in the robotic group and 48 in the LH group.
  • No significant differences in operative time, hospital stay, complications, or mortality.
  • Robotic hemihepatectomy showed significantly less estimated blood loss and lower conversion rates compared to LH.

Conclusions:

  • Robotic hemihepatectomy is a safe and feasible option for select patients.
  • Perioperative outcomes are comparable to laparoscopic hemihepatectomy (LH).
  • Robotic approach demonstrates advantages in reduced blood loss and lower conversion rates.